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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 | ||
4e655519 IM |
73 | void trace_wake_up(void) |
74 | { | |
017730c1 IM |
75 | /* |
76 | * The runqueue_is_locked() can fail, but this is the best we | |
77 | * have for now: | |
78 | */ | |
79 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) | |
4e655519 IM |
80 | wake_up(&trace_wait); |
81 | } | |
bc0c38d1 | 82 | |
4c11d7ae SR |
83 | #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(struct trace_entry)) |
84 | ||
bc0c38d1 SR |
85 | static int __init set_nr_entries(char *str) |
86 | { | |
87 | if (!str) | |
88 | return 0; | |
89 | trace_nr_entries = simple_strtoul(str, &str, 0); | |
90 | return 1; | |
91 | } | |
92 | __setup("trace_entries=", set_nr_entries); | |
93 | ||
57f50be1 SR |
94 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
95 | { | |
96 | return nsecs / 1000; | |
97 | } | |
98 | ||
bc0c38d1 SR |
99 | enum trace_type { |
100 | __TRACE_FIRST_TYPE = 0, | |
101 | ||
102 | TRACE_FN, | |
103 | TRACE_CTX, | |
57422797 | 104 | TRACE_WAKE, |
86387f7e | 105 | TRACE_STACK, |
f0a920d5 | 106 | TRACE_SPECIAL, |
bc0c38d1 SR |
107 | |
108 | __TRACE_LAST_TYPE | |
109 | }; | |
110 | ||
111 | enum trace_flag_type { | |
112 | TRACE_FLAG_IRQS_OFF = 0x01, | |
113 | TRACE_FLAG_NEED_RESCHED = 0x02, | |
114 | TRACE_FLAG_HARDIRQ = 0x04, | |
115 | TRACE_FLAG_SOFTIRQ = 0x08, | |
116 | }; | |
117 | ||
bc0c38d1 SR |
118 | #define TRACE_ITER_SYM_MASK \ |
119 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
120 | ||
121 | /* These must match the bit postions above */ | |
122 | static const char *trace_options[] = { | |
123 | "print-parent", | |
124 | "sym-offset", | |
125 | "sym-addr", | |
126 | "verbose", | |
f9896bf3 | 127 | "raw", |
5e3ca0ec | 128 | "hex", |
cb0f12aa | 129 | "bin", |
2a2cc8f7 | 130 | "block", |
86387f7e | 131 | "stacktrace", |
4ac3ba41 | 132 | "sched-tree", |
bc0c38d1 SR |
133 | NULL |
134 | }; | |
135 | ||
92205c23 SR |
136 | static raw_spinlock_t ftrace_max_lock = |
137 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; | |
bc0c38d1 SR |
138 | |
139 | /* | |
140 | * Copy the new maximum trace into the separate maximum-trace | |
141 | * structure. (this way the maximum trace is permanently saved, | |
142 | * for later retrieval via /debugfs/tracing/latency_trace) | |
143 | */ | |
e309b41d | 144 | static void |
bc0c38d1 SR |
145 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
146 | { | |
147 | struct trace_array_cpu *data = tr->data[cpu]; | |
148 | ||
149 | max_tr.cpu = cpu; | |
150 | max_tr.time_start = data->preempt_timestamp; | |
151 | ||
152 | data = max_tr.data[cpu]; | |
153 | data->saved_latency = tracing_max_latency; | |
154 | ||
155 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); | |
156 | data->pid = tsk->pid; | |
157 | data->uid = tsk->uid; | |
158 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; | |
159 | data->policy = tsk->policy; | |
160 | data->rt_priority = tsk->rt_priority; | |
161 | ||
162 | /* record this tasks comm */ | |
163 | tracing_record_cmdline(current); | |
164 | } | |
165 | ||
c7aafc54 IM |
166 | void check_pages(struct trace_array_cpu *data) |
167 | { | |
168 | struct page *page, *tmp; | |
169 | ||
170 | BUG_ON(data->trace_pages.next->prev != &data->trace_pages); | |
171 | BUG_ON(data->trace_pages.prev->next != &data->trace_pages); | |
172 | ||
173 | list_for_each_entry_safe(page, tmp, &data->trace_pages, lru) { | |
174 | BUG_ON(page->lru.next->prev != &page->lru); | |
175 | BUG_ON(page->lru.prev->next != &page->lru); | |
176 | } | |
177 | } | |
178 | ||
179 | void *head_page(struct trace_array_cpu *data) | |
180 | { | |
181 | struct page *page; | |
182 | ||
183 | check_pages(data); | |
184 | if (list_empty(&data->trace_pages)) | |
185 | return NULL; | |
186 | ||
187 | page = list_entry(data->trace_pages.next, struct page, lru); | |
188 | BUG_ON(&page->lru == &data->trace_pages); | |
189 | ||
190 | return page_address(page); | |
191 | } | |
192 | ||
e309b41d | 193 | static int |
214023c3 SR |
194 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
195 | { | |
196 | int len = (PAGE_SIZE - 1) - s->len; | |
197 | va_list ap; | |
b3806b43 | 198 | int ret; |
214023c3 SR |
199 | |
200 | if (!len) | |
201 | return 0; | |
202 | ||
203 | va_start(ap, fmt); | |
b3806b43 | 204 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
214023c3 SR |
205 | va_end(ap); |
206 | ||
b3806b43 SR |
207 | /* If we can't write it all, don't bother writing anything */ |
208 | if (ret > len) | |
209 | return 0; | |
210 | ||
211 | s->len += ret; | |
214023c3 SR |
212 | |
213 | return len; | |
214 | } | |
215 | ||
e309b41d | 216 | static int |
214023c3 SR |
217 | trace_seq_puts(struct trace_seq *s, const char *str) |
218 | { | |
219 | int len = strlen(str); | |
220 | ||
221 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
b3806b43 | 222 | return 0; |
214023c3 SR |
223 | |
224 | memcpy(s->buffer + s->len, str, len); | |
225 | s->len += len; | |
226 | ||
227 | return len; | |
228 | } | |
229 | ||
e309b41d | 230 | static int |
214023c3 SR |
231 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
232 | { | |
233 | if (s->len >= (PAGE_SIZE - 1)) | |
234 | return 0; | |
235 | ||
236 | s->buffer[s->len++] = c; | |
237 | ||
238 | return 1; | |
239 | } | |
240 | ||
e309b41d | 241 | static int |
cb0f12aa IM |
242 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
243 | { | |
244 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
245 | return 0; | |
246 | ||
247 | memcpy(s->buffer + s->len, mem, len); | |
248 | s->len += len; | |
249 | ||
250 | return len; | |
251 | } | |
252 | ||
5e3ca0ec IM |
253 | #define HEX_CHARS 17 |
254 | ||
e309b41d | 255 | static int |
5e3ca0ec IM |
256 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
257 | { | |
258 | unsigned char hex[HEX_CHARS]; | |
259 | unsigned char *data; | |
260 | unsigned char byte; | |
261 | int i, j; | |
262 | ||
263 | BUG_ON(len >= HEX_CHARS); | |
264 | ||
265 | data = mem; | |
266 | ||
267 | #ifdef __BIG_ENDIAN | |
268 | for (i = 0, j = 0; i < len; i++) { | |
269 | #else | |
270 | for (i = len-1, j = 0; i >= 0; i--) { | |
271 | #endif | |
272 | byte = data[i]; | |
273 | ||
274 | hex[j] = byte & 0x0f; | |
275 | if (hex[j] >= 10) | |
276 | hex[j] += 'a' - 10; | |
277 | else | |
278 | hex[j] += '0'; | |
279 | j++; | |
280 | ||
281 | hex[j] = byte >> 4; | |
282 | if (hex[j] >= 10) | |
283 | hex[j] += 'a' - 10; | |
284 | else | |
285 | hex[j] += '0'; | |
286 | j++; | |
287 | } | |
288 | hex[j] = ' '; | |
289 | j++; | |
290 | ||
291 | return trace_seq_putmem(s, hex, j); | |
292 | } | |
293 | ||
e309b41d | 294 | static void |
214023c3 SR |
295 | trace_seq_reset(struct trace_seq *s) |
296 | { | |
297 | s->len = 0; | |
298 | } | |
299 | ||
e309b41d | 300 | static void |
214023c3 SR |
301 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
302 | { | |
303 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; | |
304 | ||
305 | s->buffer[len] = 0; | |
306 | seq_puts(m, s->buffer); | |
307 | ||
308 | trace_seq_reset(s); | |
309 | } | |
310 | ||
e309b41d | 311 | static void |
c7aafc54 IM |
312 | flip_trace(struct trace_array_cpu *tr1, struct trace_array_cpu *tr2) |
313 | { | |
314 | struct list_head flip_pages; | |
315 | ||
316 | INIT_LIST_HEAD(&flip_pages); | |
317 | ||
93a588f4 | 318 | memcpy(&tr1->trace_head_idx, &tr2->trace_head_idx, |
c7aafc54 | 319 | sizeof(struct trace_array_cpu) - |
93a588f4 | 320 | offsetof(struct trace_array_cpu, trace_head_idx)); |
c7aafc54 IM |
321 | |
322 | check_pages(tr1); | |
323 | check_pages(tr2); | |
324 | list_splice_init(&tr1->trace_pages, &flip_pages); | |
325 | list_splice_init(&tr2->trace_pages, &tr1->trace_pages); | |
326 | list_splice_init(&flip_pages, &tr2->trace_pages); | |
327 | BUG_ON(!list_empty(&flip_pages)); | |
328 | check_pages(tr1); | |
329 | check_pages(tr2); | |
330 | } | |
331 | ||
e309b41d | 332 | void |
bc0c38d1 SR |
333 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
334 | { | |
335 | struct trace_array_cpu *data; | |
bc0c38d1 SR |
336 | int i; |
337 | ||
4c11d7ae | 338 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 339 | __raw_spin_lock(&ftrace_max_lock); |
bc0c38d1 SR |
340 | /* clear out all the previous traces */ |
341 | for_each_possible_cpu(i) { | |
342 | data = tr->data[i]; | |
c7aafc54 | 343 | flip_trace(max_tr.data[i], data); |
89b2f978 | 344 | tracing_reset(data); |
bc0c38d1 SR |
345 | } |
346 | ||
347 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 348 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
349 | } |
350 | ||
351 | /** | |
352 | * update_max_tr_single - only copy one trace over, and reset the rest | |
353 | * @tr - tracer | |
354 | * @tsk - task with the latency | |
355 | * @cpu - the cpu of the buffer to copy. | |
356 | */ | |
e309b41d | 357 | void |
bc0c38d1 SR |
358 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
359 | { | |
360 | struct trace_array_cpu *data = tr->data[cpu]; | |
bc0c38d1 SR |
361 | int i; |
362 | ||
4c11d7ae | 363 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 364 | __raw_spin_lock(&ftrace_max_lock); |
bc0c38d1 SR |
365 | for_each_possible_cpu(i) |
366 | tracing_reset(max_tr.data[i]); | |
367 | ||
c7aafc54 | 368 | flip_trace(max_tr.data[cpu], data); |
89b2f978 | 369 | tracing_reset(data); |
bc0c38d1 SR |
370 | |
371 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 372 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
373 | } |
374 | ||
375 | int register_tracer(struct tracer *type) | |
376 | { | |
377 | struct tracer *t; | |
378 | int len; | |
379 | int ret = 0; | |
380 | ||
381 | if (!type->name) { | |
382 | pr_info("Tracer must have a name\n"); | |
383 | return -1; | |
384 | } | |
385 | ||
386 | mutex_lock(&trace_types_lock); | |
387 | for (t = trace_types; t; t = t->next) { | |
388 | if (strcmp(type->name, t->name) == 0) { | |
389 | /* already found */ | |
390 | pr_info("Trace %s already registered\n", | |
391 | type->name); | |
392 | ret = -1; | |
393 | goto out; | |
394 | } | |
395 | } | |
396 | ||
60a11774 SR |
397 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
398 | if (type->selftest) { | |
399 | struct tracer *saved_tracer = current_trace; | |
400 | struct trace_array_cpu *data; | |
401 | struct trace_array *tr = &global_trace; | |
402 | int saved_ctrl = tr->ctrl; | |
403 | int i; | |
404 | /* | |
405 | * Run a selftest on this tracer. | |
406 | * Here we reset the trace buffer, and set the current | |
407 | * tracer to be this tracer. The tracer can then run some | |
408 | * internal tracing to verify that everything is in order. | |
409 | * If we fail, we do not register this tracer. | |
410 | */ | |
411 | for_each_possible_cpu(i) { | |
60a11774 | 412 | data = tr->data[i]; |
c7aafc54 IM |
413 | if (!head_page(data)) |
414 | continue; | |
60a11774 SR |
415 | tracing_reset(data); |
416 | } | |
417 | current_trace = type; | |
418 | tr->ctrl = 0; | |
419 | /* the test is responsible for initializing and enabling */ | |
420 | pr_info("Testing tracer %s: ", type->name); | |
421 | ret = type->selftest(type, tr); | |
422 | /* the test is responsible for resetting too */ | |
423 | current_trace = saved_tracer; | |
424 | tr->ctrl = saved_ctrl; | |
425 | if (ret) { | |
426 | printk(KERN_CONT "FAILED!\n"); | |
427 | goto out; | |
428 | } | |
1d4db00a SR |
429 | /* Only reset on passing, to avoid touching corrupted buffers */ |
430 | for_each_possible_cpu(i) { | |
431 | data = tr->data[i]; | |
432 | if (!head_page(data)) | |
433 | continue; | |
434 | tracing_reset(data); | |
435 | } | |
60a11774 SR |
436 | printk(KERN_CONT "PASSED\n"); |
437 | } | |
438 | #endif | |
439 | ||
bc0c38d1 SR |
440 | type->next = trace_types; |
441 | trace_types = type; | |
442 | len = strlen(type->name); | |
443 | if (len > max_tracer_type_len) | |
444 | max_tracer_type_len = len; | |
60a11774 | 445 | |
bc0c38d1 SR |
446 | out: |
447 | mutex_unlock(&trace_types_lock); | |
448 | ||
449 | return ret; | |
450 | } | |
451 | ||
452 | void unregister_tracer(struct tracer *type) | |
453 | { | |
454 | struct tracer **t; | |
455 | int len; | |
456 | ||
457 | mutex_lock(&trace_types_lock); | |
458 | for (t = &trace_types; *t; t = &(*t)->next) { | |
459 | if (*t == type) | |
460 | goto found; | |
461 | } | |
462 | pr_info("Trace %s not registered\n", type->name); | |
463 | goto out; | |
464 | ||
465 | found: | |
466 | *t = (*t)->next; | |
467 | if (strlen(type->name) != max_tracer_type_len) | |
468 | goto out; | |
469 | ||
470 | max_tracer_type_len = 0; | |
471 | for (t = &trace_types; *t; t = &(*t)->next) { | |
472 | len = strlen((*t)->name); | |
473 | if (len > max_tracer_type_len) | |
474 | max_tracer_type_len = len; | |
475 | } | |
476 | out: | |
477 | mutex_unlock(&trace_types_lock); | |
478 | } | |
479 | ||
e309b41d | 480 | void tracing_reset(struct trace_array_cpu *data) |
bc0c38d1 SR |
481 | { |
482 | data->trace_idx = 0; | |
93a588f4 SR |
483 | data->trace_head = data->trace_tail = head_page(data); |
484 | data->trace_head_idx = 0; | |
485 | data->trace_tail_idx = 0; | |
bc0c38d1 SR |
486 | } |
487 | ||
bc0c38d1 SR |
488 | #define SAVED_CMDLINES 128 |
489 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; | |
490 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; | |
491 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; | |
492 | static int cmdline_idx; | |
493 | static DEFINE_SPINLOCK(trace_cmdline_lock); | |
494 | atomic_t trace_record_cmdline_disabled; | |
495 | ||
496 | static void trace_init_cmdlines(void) | |
497 | { | |
498 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); | |
499 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); | |
500 | cmdline_idx = 0; | |
501 | } | |
502 | ||
e309b41d | 503 | void trace_stop_cmdline_recording(void); |
bc0c38d1 | 504 | |
e309b41d | 505 | static void trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
506 | { |
507 | unsigned map; | |
508 | unsigned idx; | |
509 | ||
510 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
511 | return; | |
512 | ||
513 | /* | |
514 | * It's not the end of the world if we don't get | |
515 | * the lock, but we also don't want to spin | |
516 | * nor do we want to disable interrupts, | |
517 | * so if we miss here, then better luck next time. | |
518 | */ | |
519 | if (!spin_trylock(&trace_cmdline_lock)) | |
520 | return; | |
521 | ||
522 | idx = map_pid_to_cmdline[tsk->pid]; | |
523 | if (idx >= SAVED_CMDLINES) { | |
524 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; | |
525 | ||
526 | map = map_cmdline_to_pid[idx]; | |
527 | if (map <= PID_MAX_DEFAULT) | |
528 | map_pid_to_cmdline[map] = (unsigned)-1; | |
529 | ||
530 | map_pid_to_cmdline[tsk->pid] = idx; | |
531 | ||
532 | cmdline_idx = idx; | |
533 | } | |
534 | ||
535 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); | |
536 | ||
537 | spin_unlock(&trace_cmdline_lock); | |
538 | } | |
539 | ||
e309b41d | 540 | static char *trace_find_cmdline(int pid) |
bc0c38d1 SR |
541 | { |
542 | char *cmdline = "<...>"; | |
543 | unsigned map; | |
544 | ||
545 | if (!pid) | |
546 | return "<idle>"; | |
547 | ||
548 | if (pid > PID_MAX_DEFAULT) | |
549 | goto out; | |
550 | ||
551 | map = map_pid_to_cmdline[pid]; | |
552 | if (map >= SAVED_CMDLINES) | |
553 | goto out; | |
554 | ||
555 | cmdline = saved_cmdlines[map]; | |
556 | ||
557 | out: | |
558 | return cmdline; | |
559 | } | |
560 | ||
e309b41d | 561 | void tracing_record_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
562 | { |
563 | if (atomic_read(&trace_record_cmdline_disabled)) | |
564 | return; | |
565 | ||
566 | trace_save_cmdline(tsk); | |
567 | } | |
568 | ||
e309b41d | 569 | static inline struct list_head * |
93a588f4 SR |
570 | trace_next_list(struct trace_array_cpu *data, struct list_head *next) |
571 | { | |
572 | /* | |
573 | * Roundrobin - but skip the head (which is not a real page): | |
574 | */ | |
575 | next = next->next; | |
576 | if (unlikely(next == &data->trace_pages)) | |
577 | next = next->next; | |
578 | BUG_ON(next == &data->trace_pages); | |
579 | ||
580 | return next; | |
581 | } | |
582 | ||
e309b41d | 583 | static inline void * |
93a588f4 SR |
584 | trace_next_page(struct trace_array_cpu *data, void *addr) |
585 | { | |
586 | struct list_head *next; | |
587 | struct page *page; | |
588 | ||
589 | page = virt_to_page(addr); | |
590 | ||
591 | next = trace_next_list(data, &page->lru); | |
592 | page = list_entry(next, struct page, lru); | |
593 | ||
594 | return page_address(page); | |
595 | } | |
596 | ||
e309b41d | 597 | static inline struct trace_entry * |
c7aafc54 | 598 | tracing_get_trace_entry(struct trace_array *tr, struct trace_array_cpu *data) |
bc0c38d1 SR |
599 | { |
600 | unsigned long idx, idx_next; | |
601 | struct trace_entry *entry; | |
602 | ||
4c11d7ae | 603 | data->trace_idx++; |
93a588f4 | 604 | idx = data->trace_head_idx; |
bc0c38d1 SR |
605 | idx_next = idx + 1; |
606 | ||
c7aafc54 IM |
607 | BUG_ON(idx * TRACE_ENTRY_SIZE >= PAGE_SIZE); |
608 | ||
93a588f4 | 609 | entry = data->trace_head + idx * TRACE_ENTRY_SIZE; |
4c11d7ae SR |
610 | |
611 | if (unlikely(idx_next >= ENTRIES_PER_PAGE)) { | |
93a588f4 | 612 | data->trace_head = trace_next_page(data, data->trace_head); |
bc0c38d1 SR |
613 | idx_next = 0; |
614 | } | |
615 | ||
93a588f4 SR |
616 | if (data->trace_head == data->trace_tail && |
617 | idx_next == data->trace_tail_idx) { | |
618 | /* overrun */ | |
619 | data->trace_tail_idx++; | |
620 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { | |
621 | data->trace_tail = | |
622 | trace_next_page(data, data->trace_tail); | |
623 | data->trace_tail_idx = 0; | |
624 | } | |
625 | } | |
626 | ||
627 | data->trace_head_idx = idx_next; | |
bc0c38d1 SR |
628 | |
629 | return entry; | |
630 | } | |
631 | ||
e309b41d | 632 | static inline void |
c7aafc54 | 633 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags) |
bc0c38d1 SR |
634 | { |
635 | struct task_struct *tsk = current; | |
636 | unsigned long pc; | |
637 | ||
638 | pc = preempt_count(); | |
639 | ||
c7aafc54 IM |
640 | entry->preempt_count = pc & 0xff; |
641 | entry->pid = tsk->pid; | |
750ed1a4 | 642 | entry->t = ftrace_now(raw_smp_processor_id()); |
bc0c38d1 SR |
643 | entry->flags = (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
644 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | | |
645 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | | |
646 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); | |
647 | } | |
648 | ||
e309b41d | 649 | void |
6fb44b71 SR |
650 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
651 | unsigned long ip, unsigned long parent_ip, unsigned long flags) | |
bc0c38d1 SR |
652 | { |
653 | struct trace_entry *entry; | |
dcb6308f | 654 | unsigned long irq_flags; |
bc0c38d1 | 655 | |
92205c23 SR |
656 | raw_local_irq_save(irq_flags); |
657 | __raw_spin_lock(&data->lock); | |
c7aafc54 | 658 | entry = tracing_get_trace_entry(tr, data); |
bc0c38d1 | 659 | tracing_generic_entry_update(entry, flags); |
c7aafc54 IM |
660 | entry->type = TRACE_FN; |
661 | entry->fn.ip = ip; | |
662 | entry->fn.parent_ip = parent_ip; | |
92205c23 SR |
663 | __raw_spin_unlock(&data->lock); |
664 | raw_local_irq_restore(irq_flags); | |
bc0c38d1 SR |
665 | } |
666 | ||
e309b41d | 667 | void |
2e0f5761 IM |
668 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
669 | unsigned long ip, unsigned long parent_ip, unsigned long flags) | |
670 | { | |
671 | if (likely(!atomic_read(&data->disabled))) | |
6fb44b71 | 672 | trace_function(tr, data, ip, parent_ip, flags); |
2e0f5761 IM |
673 | } |
674 | ||
e309b41d | 675 | void |
4e655519 IM |
676 | __trace_special(void *__tr, void *__data, |
677 | unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
f0a920d5 | 678 | { |
4e655519 IM |
679 | struct trace_array_cpu *data = __data; |
680 | struct trace_array *tr = __tr; | |
f0a920d5 | 681 | struct trace_entry *entry; |
dcb6308f | 682 | unsigned long irq_flags; |
f0a920d5 | 683 | |
92205c23 SR |
684 | raw_local_irq_save(irq_flags); |
685 | __raw_spin_lock(&data->lock); | |
f0a920d5 IM |
686 | entry = tracing_get_trace_entry(tr, data); |
687 | tracing_generic_entry_update(entry, 0); | |
688 | entry->type = TRACE_SPECIAL; | |
689 | entry->special.arg1 = arg1; | |
690 | entry->special.arg2 = arg2; | |
691 | entry->special.arg3 = arg3; | |
92205c23 SR |
692 | __raw_spin_unlock(&data->lock); |
693 | raw_local_irq_restore(irq_flags); | |
017730c1 IM |
694 | |
695 | trace_wake_up(); | |
86387f7e IM |
696 | } |
697 | ||
698 | void __trace_stack(struct trace_array *tr, | |
699 | struct trace_array_cpu *data, | |
700 | unsigned long flags, | |
701 | int skip) | |
702 | { | |
703 | struct trace_entry *entry; | |
704 | struct stack_trace trace; | |
705 | ||
706 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) | |
707 | return; | |
708 | ||
709 | entry = tracing_get_trace_entry(tr, data); | |
710 | tracing_generic_entry_update(entry, flags); | |
711 | entry->type = TRACE_STACK; | |
712 | ||
713 | memset(&entry->stack, 0, sizeof(entry->stack)); | |
714 | ||
715 | trace.nr_entries = 0; | |
716 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
717 | trace.skip = skip; | |
718 | trace.entries = entry->stack.caller; | |
719 | ||
720 | save_stack_trace(&trace); | |
f0a920d5 IM |
721 | } |
722 | ||
e309b41d | 723 | void |
bc0c38d1 SR |
724 | tracing_sched_switch_trace(struct trace_array *tr, |
725 | struct trace_array_cpu *data, | |
86387f7e IM |
726 | struct task_struct *prev, |
727 | struct task_struct *next, | |
bc0c38d1 SR |
728 | unsigned long flags) |
729 | { | |
730 | struct trace_entry *entry; | |
dcb6308f | 731 | unsigned long irq_flags; |
bc0c38d1 | 732 | |
92205c23 SR |
733 | raw_local_irq_save(irq_flags); |
734 | __raw_spin_lock(&data->lock); | |
c7aafc54 | 735 | entry = tracing_get_trace_entry(tr, data); |
bc0c38d1 SR |
736 | tracing_generic_entry_update(entry, flags); |
737 | entry->type = TRACE_CTX; | |
738 | entry->ctx.prev_pid = prev->pid; | |
739 | entry->ctx.prev_prio = prev->prio; | |
740 | entry->ctx.prev_state = prev->state; | |
741 | entry->ctx.next_pid = next->pid; | |
742 | entry->ctx.next_prio = next->prio; | |
bac524d3 | 743 | entry->ctx.next_state = next->state; |
86387f7e | 744 | __trace_stack(tr, data, flags, 4); |
92205c23 SR |
745 | __raw_spin_unlock(&data->lock); |
746 | raw_local_irq_restore(irq_flags); | |
bc0c38d1 SR |
747 | } |
748 | ||
57422797 IM |
749 | void |
750 | tracing_sched_wakeup_trace(struct trace_array *tr, | |
751 | struct trace_array_cpu *data, | |
86387f7e IM |
752 | struct task_struct *wakee, |
753 | struct task_struct *curr, | |
57422797 IM |
754 | unsigned long flags) |
755 | { | |
756 | struct trace_entry *entry; | |
757 | unsigned long irq_flags; | |
758 | ||
92205c23 SR |
759 | raw_local_irq_save(irq_flags); |
760 | __raw_spin_lock(&data->lock); | |
57422797 IM |
761 | entry = tracing_get_trace_entry(tr, data); |
762 | tracing_generic_entry_update(entry, flags); | |
763 | entry->type = TRACE_WAKE; | |
764 | entry->ctx.prev_pid = curr->pid; | |
765 | entry->ctx.prev_prio = curr->prio; | |
766 | entry->ctx.prev_state = curr->state; | |
767 | entry->ctx.next_pid = wakee->pid; | |
768 | entry->ctx.next_prio = wakee->prio; | |
bac524d3 | 769 | entry->ctx.next_state = wakee->state; |
86387f7e | 770 | __trace_stack(tr, data, flags, 5); |
92205c23 SR |
771 | __raw_spin_unlock(&data->lock); |
772 | raw_local_irq_restore(irq_flags); | |
017730c1 IM |
773 | |
774 | trace_wake_up(); | |
57422797 IM |
775 | } |
776 | ||
2e0f5761 | 777 | #ifdef CONFIG_FTRACE |
e309b41d | 778 | static void |
2e0f5761 IM |
779 | function_trace_call(unsigned long ip, unsigned long parent_ip) |
780 | { | |
781 | struct trace_array *tr = &global_trace; | |
782 | struct trace_array_cpu *data; | |
783 | unsigned long flags; | |
784 | long disabled; | |
785 | int cpu; | |
786 | ||
787 | if (unlikely(!tracer_enabled)) | |
788 | return; | |
789 | ||
790 | local_irq_save(flags); | |
791 | cpu = raw_smp_processor_id(); | |
792 | data = tr->data[cpu]; | |
793 | disabled = atomic_inc_return(&data->disabled); | |
794 | ||
795 | if (likely(disabled == 1)) | |
6fb44b71 | 796 | trace_function(tr, data, ip, parent_ip, flags); |
2e0f5761 IM |
797 | |
798 | atomic_dec(&data->disabled); | |
799 | local_irq_restore(flags); | |
800 | } | |
801 | ||
802 | static struct ftrace_ops trace_ops __read_mostly = | |
803 | { | |
804 | .func = function_trace_call, | |
805 | }; | |
806 | ||
e309b41d | 807 | void tracing_start_function_trace(void) |
2e0f5761 IM |
808 | { |
809 | register_ftrace_function(&trace_ops); | |
810 | } | |
811 | ||
e309b41d | 812 | void tracing_stop_function_trace(void) |
2e0f5761 IM |
813 | { |
814 | unregister_ftrace_function(&trace_ops); | |
815 | } | |
816 | #endif | |
817 | ||
bc0c38d1 SR |
818 | enum trace_file_type { |
819 | TRACE_FILE_LAT_FMT = 1, | |
820 | }; | |
821 | ||
822 | static struct trace_entry * | |
4c11d7ae SR |
823 | trace_entry_idx(struct trace_array *tr, struct trace_array_cpu *data, |
824 | struct trace_iterator *iter, int cpu) | |
bc0c38d1 | 825 | { |
4c11d7ae SR |
826 | struct page *page; |
827 | struct trace_entry *array; | |
bc0c38d1 | 828 | |
4c11d7ae | 829 | if (iter->next_idx[cpu] >= tr->entries || |
b3806b43 SR |
830 | iter->next_idx[cpu] >= data->trace_idx || |
831 | (data->trace_head == data->trace_tail && | |
832 | data->trace_head_idx == data->trace_tail_idx)) | |
bc0c38d1 SR |
833 | return NULL; |
834 | ||
4c11d7ae | 835 | if (!iter->next_page[cpu]) { |
93a588f4 SR |
836 | /* Initialize the iterator for this cpu trace buffer */ |
837 | WARN_ON(!data->trace_tail); | |
838 | page = virt_to_page(data->trace_tail); | |
839 | iter->next_page[cpu] = &page->lru; | |
840 | iter->next_page_idx[cpu] = data->trace_tail_idx; | |
4c11d7ae | 841 | } |
bc0c38d1 | 842 | |
4c11d7ae | 843 | page = list_entry(iter->next_page[cpu], struct page, lru); |
c7aafc54 IM |
844 | BUG_ON(&data->trace_pages == &page->lru); |
845 | ||
4c11d7ae SR |
846 | array = page_address(page); |
847 | ||
93a588f4 | 848 | WARN_ON(iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE); |
4c11d7ae | 849 | return &array[iter->next_page_idx[cpu]]; |
bc0c38d1 SR |
850 | } |
851 | ||
e309b41d | 852 | static struct trace_entry * |
bc0c38d1 SR |
853 | find_next_entry(struct trace_iterator *iter, int *ent_cpu) |
854 | { | |
855 | struct trace_array *tr = iter->tr; | |
856 | struct trace_entry *ent, *next = NULL; | |
857 | int next_cpu = -1; | |
858 | int cpu; | |
859 | ||
860 | for_each_possible_cpu(cpu) { | |
c7aafc54 | 861 | if (!head_page(tr->data[cpu])) |
bc0c38d1 | 862 | continue; |
4c11d7ae | 863 | ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); |
cdd31cd2 IM |
864 | /* |
865 | * Pick the entry with the smallest timestamp: | |
866 | */ | |
867 | if (ent && (!next || ent->t < next->t)) { | |
bc0c38d1 SR |
868 | next = ent; |
869 | next_cpu = cpu; | |
870 | } | |
871 | } | |
872 | ||
873 | if (ent_cpu) | |
874 | *ent_cpu = next_cpu; | |
875 | ||
876 | return next; | |
877 | } | |
878 | ||
e309b41d | 879 | static void trace_iterator_increment(struct trace_iterator *iter) |
bc0c38d1 | 880 | { |
b3806b43 SR |
881 | iter->idx++; |
882 | iter->next_idx[iter->cpu]++; | |
883 | iter->next_page_idx[iter->cpu]++; | |
8c523a9d | 884 | |
b3806b43 SR |
885 | if (iter->next_page_idx[iter->cpu] >= ENTRIES_PER_PAGE) { |
886 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; | |
bc0c38d1 | 887 | |
b3806b43 SR |
888 | iter->next_page_idx[iter->cpu] = 0; |
889 | iter->next_page[iter->cpu] = | |
890 | trace_next_list(data, iter->next_page[iter->cpu]); | |
891 | } | |
892 | } | |
bc0c38d1 | 893 | |
e309b41d | 894 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 SR |
895 | { |
896 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; | |
897 | ||
898 | data->trace_tail_idx++; | |
899 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { | |
900 | data->trace_tail = trace_next_page(data, data->trace_tail); | |
901 | data->trace_tail_idx = 0; | |
902 | } | |
4e3c3333 | 903 | |
b3806b43 SR |
904 | /* Check if we empty it, then reset the index */ |
905 | if (data->trace_head == data->trace_tail && | |
906 | data->trace_head_idx == data->trace_tail_idx) | |
907 | data->trace_idx = 0; | |
b3806b43 SR |
908 | } |
909 | ||
e309b41d | 910 | static void *find_next_entry_inc(struct trace_iterator *iter) |
b3806b43 SR |
911 | { |
912 | struct trace_entry *next; | |
913 | int next_cpu = -1; | |
914 | ||
915 | next = find_next_entry(iter, &next_cpu); | |
93a588f4 | 916 | |
4e3c3333 IM |
917 | iter->prev_ent = iter->ent; |
918 | iter->prev_cpu = iter->cpu; | |
919 | ||
bc0c38d1 SR |
920 | iter->ent = next; |
921 | iter->cpu = next_cpu; | |
922 | ||
b3806b43 SR |
923 | if (next) |
924 | trace_iterator_increment(iter); | |
925 | ||
bc0c38d1 SR |
926 | return next ? iter : NULL; |
927 | } | |
928 | ||
e309b41d | 929 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
930 | { |
931 | struct trace_iterator *iter = m->private; | |
bc0c38d1 SR |
932 | void *last_ent = iter->ent; |
933 | int i = (int)*pos; | |
4e3c3333 | 934 | void *ent; |
bc0c38d1 SR |
935 | |
936 | (*pos)++; | |
937 | ||
938 | /* can't go backwards */ | |
939 | if (iter->idx > i) | |
940 | return NULL; | |
941 | ||
942 | if (iter->idx < 0) | |
943 | ent = find_next_entry_inc(iter); | |
944 | else | |
945 | ent = iter; | |
946 | ||
947 | while (ent && iter->idx < i) | |
948 | ent = find_next_entry_inc(iter); | |
949 | ||
950 | iter->pos = *pos; | |
951 | ||
952 | if (last_ent && !ent) | |
953 | seq_puts(m, "\n\nvim:ft=help\n"); | |
954 | ||
955 | return ent; | |
956 | } | |
957 | ||
958 | static void *s_start(struct seq_file *m, loff_t *pos) | |
959 | { | |
960 | struct trace_iterator *iter = m->private; | |
961 | void *p = NULL; | |
962 | loff_t l = 0; | |
963 | int i; | |
964 | ||
965 | mutex_lock(&trace_types_lock); | |
966 | ||
967 | if (!current_trace || current_trace != iter->trace) | |
968 | return NULL; | |
969 | ||
970 | atomic_inc(&trace_record_cmdline_disabled); | |
971 | ||
972 | /* let the tracer grab locks here if needed */ | |
973 | if (current_trace->start) | |
974 | current_trace->start(iter); | |
975 | ||
976 | if (*pos != iter->pos) { | |
977 | iter->ent = NULL; | |
978 | iter->cpu = 0; | |
979 | iter->idx = -1; | |
4e3c3333 IM |
980 | iter->prev_ent = NULL; |
981 | iter->prev_cpu = -1; | |
bc0c38d1 | 982 | |
4c11d7ae | 983 | for_each_possible_cpu(i) { |
bc0c38d1 | 984 | iter->next_idx[i] = 0; |
4c11d7ae SR |
985 | iter->next_page[i] = NULL; |
986 | } | |
bc0c38d1 SR |
987 | |
988 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) | |
989 | ; | |
990 | ||
991 | } else { | |
4c11d7ae | 992 | l = *pos - 1; |
bc0c38d1 SR |
993 | p = s_next(m, p, &l); |
994 | } | |
995 | ||
996 | return p; | |
997 | } | |
998 | ||
999 | static void s_stop(struct seq_file *m, void *p) | |
1000 | { | |
1001 | struct trace_iterator *iter = m->private; | |
1002 | ||
1003 | atomic_dec(&trace_record_cmdline_disabled); | |
1004 | ||
1005 | /* let the tracer release locks here if needed */ | |
1006 | if (current_trace && current_trace == iter->trace && iter->trace->stop) | |
1007 | iter->trace->stop(iter); | |
1008 | ||
1009 | mutex_unlock(&trace_types_lock); | |
1010 | } | |
1011 | ||
b3806b43 | 1012 | static int |
214023c3 | 1013 | seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) |
bc0c38d1 SR |
1014 | { |
1015 | #ifdef CONFIG_KALLSYMS | |
1016 | char str[KSYM_SYMBOL_LEN]; | |
1017 | ||
1018 | kallsyms_lookup(address, NULL, NULL, NULL, str); | |
1019 | ||
b3806b43 | 1020 | return trace_seq_printf(s, fmt, str); |
bc0c38d1 | 1021 | #endif |
b3806b43 | 1022 | return 1; |
bc0c38d1 SR |
1023 | } |
1024 | ||
b3806b43 | 1025 | static int |
214023c3 SR |
1026 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
1027 | unsigned long address) | |
bc0c38d1 SR |
1028 | { |
1029 | #ifdef CONFIG_KALLSYMS | |
1030 | char str[KSYM_SYMBOL_LEN]; | |
1031 | ||
1032 | sprint_symbol(str, address); | |
b3806b43 | 1033 | return trace_seq_printf(s, fmt, str); |
bc0c38d1 | 1034 | #endif |
b3806b43 | 1035 | return 1; |
bc0c38d1 SR |
1036 | } |
1037 | ||
1038 | #ifndef CONFIG_64BIT | |
1039 | # define IP_FMT "%08lx" | |
1040 | #else | |
1041 | # define IP_FMT "%016lx" | |
1042 | #endif | |
1043 | ||
e309b41d | 1044 | static int |
214023c3 | 1045 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) |
bc0c38d1 | 1046 | { |
b3806b43 SR |
1047 | int ret; |
1048 | ||
1049 | if (!ip) | |
1050 | return trace_seq_printf(s, "0"); | |
bc0c38d1 SR |
1051 | |
1052 | if (sym_flags & TRACE_ITER_SYM_OFFSET) | |
b3806b43 | 1053 | ret = seq_print_sym_offset(s, "%s", ip); |
bc0c38d1 | 1054 | else |
b3806b43 SR |
1055 | ret = seq_print_sym_short(s, "%s", ip); |
1056 | ||
1057 | if (!ret) | |
1058 | return 0; | |
bc0c38d1 SR |
1059 | |
1060 | if (sym_flags & TRACE_ITER_SYM_ADDR) | |
b3806b43 SR |
1061 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
1062 | return ret; | |
bc0c38d1 SR |
1063 | } |
1064 | ||
e309b41d | 1065 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 SR |
1066 | { |
1067 | seq_puts(m, "# _------=> CPU# \n"); | |
1068 | seq_puts(m, "# / _-----=> irqs-off \n"); | |
1069 | seq_puts(m, "# | / _----=> need-resched \n"); | |
1070 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); | |
1071 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); | |
1072 | seq_puts(m, "# |||| / \n"); | |
1073 | seq_puts(m, "# ||||| delay \n"); | |
1074 | seq_puts(m, "# cmd pid ||||| time | caller \n"); | |
1075 | seq_puts(m, "# \\ / ||||| \\ | / \n"); | |
1076 | } | |
1077 | ||
e309b41d | 1078 | static void print_func_help_header(struct seq_file *m) |
bc0c38d1 SR |
1079 | { |
1080 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); | |
1081 | seq_puts(m, "# | | | | |\n"); | |
1082 | } | |
1083 | ||
1084 | ||
e309b41d | 1085 | static void |
bc0c38d1 SR |
1086 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
1087 | { | |
1088 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); | |
1089 | struct trace_array *tr = iter->tr; | |
1090 | struct trace_array_cpu *data = tr->data[tr->cpu]; | |
1091 | struct tracer *type = current_trace; | |
4c11d7ae SR |
1092 | unsigned long total = 0; |
1093 | unsigned long entries = 0; | |
bc0c38d1 SR |
1094 | int cpu; |
1095 | const char *name = "preemption"; | |
1096 | ||
1097 | if (type) | |
1098 | name = type->name; | |
1099 | ||
1100 | for_each_possible_cpu(cpu) { | |
c7aafc54 | 1101 | if (head_page(tr->data[cpu])) { |
4c11d7ae SR |
1102 | total += tr->data[cpu]->trace_idx; |
1103 | if (tr->data[cpu]->trace_idx > tr->entries) | |
bc0c38d1 | 1104 | entries += tr->entries; |
4c11d7ae | 1105 | else |
bc0c38d1 SR |
1106 | entries += tr->data[cpu]->trace_idx; |
1107 | } | |
1108 | } | |
1109 | ||
1110 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", | |
1111 | name, UTS_RELEASE); | |
1112 | seq_puts(m, "-----------------------------------" | |
1113 | "---------------------------------\n"); | |
1114 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" | |
1115 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", | |
57f50be1 | 1116 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 1117 | entries, |
4c11d7ae | 1118 | total, |
bc0c38d1 SR |
1119 | tr->cpu, |
1120 | #if defined(CONFIG_PREEMPT_NONE) | |
1121 | "server", | |
1122 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
1123 | "desktop", | |
1124 | #elif defined(CONFIG_PREEMPT_DESKTOP) | |
1125 | "preempt", | |
1126 | #else | |
1127 | "unknown", | |
1128 | #endif | |
1129 | /* These are reserved for later use */ | |
1130 | 0, 0, 0, 0); | |
1131 | #ifdef CONFIG_SMP | |
1132 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
1133 | #else | |
1134 | seq_puts(m, ")\n"); | |
1135 | #endif | |
1136 | seq_puts(m, " -----------------\n"); | |
1137 | seq_printf(m, " | task: %.16s-%d " | |
1138 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", | |
1139 | data->comm, data->pid, data->uid, data->nice, | |
1140 | data->policy, data->rt_priority); | |
1141 | seq_puts(m, " -----------------\n"); | |
1142 | ||
1143 | if (data->critical_start) { | |
1144 | seq_puts(m, " => started at: "); | |
214023c3 SR |
1145 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
1146 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 | 1147 | seq_puts(m, "\n => ended at: "); |
214023c3 SR |
1148 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
1149 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 SR |
1150 | seq_puts(m, "\n"); |
1151 | } | |
1152 | ||
1153 | seq_puts(m, "\n"); | |
1154 | } | |
1155 | ||
e309b41d | 1156 | static void |
214023c3 | 1157 | lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) |
bc0c38d1 SR |
1158 | { |
1159 | int hardirq, softirq; | |
1160 | char *comm; | |
1161 | ||
1162 | comm = trace_find_cmdline(entry->pid); | |
1163 | ||
214023c3 SR |
1164 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
1165 | trace_seq_printf(s, "%d", cpu); | |
1166 | trace_seq_printf(s, "%c%c", | |
1167 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.', | |
1168 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); | |
bc0c38d1 SR |
1169 | |
1170 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; | |
1171 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; | |
1172 | if (hardirq && softirq) | |
214023c3 | 1173 | trace_seq_putc(s, 'H'); |
bc0c38d1 SR |
1174 | else { |
1175 | if (hardirq) | |
214023c3 | 1176 | trace_seq_putc(s, 'h'); |
bc0c38d1 SR |
1177 | else { |
1178 | if (softirq) | |
214023c3 | 1179 | trace_seq_putc(s, 's'); |
bc0c38d1 | 1180 | else |
214023c3 | 1181 | trace_seq_putc(s, '.'); |
bc0c38d1 SR |
1182 | } |
1183 | } | |
1184 | ||
1185 | if (entry->preempt_count) | |
214023c3 | 1186 | trace_seq_printf(s, "%x", entry->preempt_count); |
bc0c38d1 | 1187 | else |
214023c3 | 1188 | trace_seq_puts(s, "."); |
bc0c38d1 SR |
1189 | } |
1190 | ||
1191 | unsigned long preempt_mark_thresh = 100; | |
1192 | ||
e309b41d | 1193 | static void |
214023c3 | 1194 | lat_print_timestamp(struct trace_seq *s, unsigned long long abs_usecs, |
bc0c38d1 SR |
1195 | unsigned long rel_usecs) |
1196 | { | |
214023c3 | 1197 | trace_seq_printf(s, " %4lldus", abs_usecs); |
bc0c38d1 | 1198 | if (rel_usecs > preempt_mark_thresh) |
214023c3 | 1199 | trace_seq_puts(s, "!: "); |
bc0c38d1 | 1200 | else if (rel_usecs > 1) |
214023c3 | 1201 | trace_seq_puts(s, "+: "); |
bc0c38d1 | 1202 | else |
214023c3 | 1203 | trace_seq_puts(s, " : "); |
bc0c38d1 SR |
1204 | } |
1205 | ||
1206 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; | |
1207 | ||
e309b41d | 1208 | static int |
214023c3 | 1209 | print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) |
bc0c38d1 | 1210 | { |
214023c3 | 1211 | struct trace_seq *s = &iter->seq; |
bc0c38d1 SR |
1212 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
1213 | struct trace_entry *next_entry = find_next_entry(iter, NULL); | |
1214 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); | |
1215 | struct trace_entry *entry = iter->ent; | |
1216 | unsigned long abs_usecs; | |
1217 | unsigned long rel_usecs; | |
1218 | char *comm; | |
bac524d3 | 1219 | int S, T; |
86387f7e | 1220 | int i; |
bc0c38d1 SR |
1221 | |
1222 | if (!next_entry) | |
1223 | next_entry = entry; | |
1224 | rel_usecs = ns2usecs(next_entry->t - entry->t); | |
1225 | abs_usecs = ns2usecs(entry->t - iter->tr->time_start); | |
1226 | ||
1227 | if (verbose) { | |
1228 | comm = trace_find_cmdline(entry->pid); | |
214023c3 SR |
1229 | trace_seq_printf(s, "%16s %5d %d %d %08x %08x [%08lx]" |
1230 | " %ld.%03ldms (+%ld.%03ldms): ", | |
1231 | comm, | |
1232 | entry->pid, cpu, entry->flags, | |
1233 | entry->preempt_count, trace_idx, | |
1234 | ns2usecs(entry->t), | |
1235 | abs_usecs/1000, | |
1236 | abs_usecs % 1000, rel_usecs/1000, | |
1237 | rel_usecs % 1000); | |
bc0c38d1 | 1238 | } else { |
f29c73fe IM |
1239 | lat_print_generic(s, entry, cpu); |
1240 | lat_print_timestamp(s, abs_usecs, rel_usecs); | |
bc0c38d1 SR |
1241 | } |
1242 | switch (entry->type) { | |
1243 | case TRACE_FN: | |
214023c3 SR |
1244 | seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
1245 | trace_seq_puts(s, " ("); | |
1246 | seq_print_ip_sym(s, entry->fn.parent_ip, sym_flags); | |
1247 | trace_seq_puts(s, ")\n"); | |
bc0c38d1 SR |
1248 | break; |
1249 | case TRACE_CTX: | |
57422797 | 1250 | case TRACE_WAKE: |
bc0c38d1 SR |
1251 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
1252 | state_to_char[entry->ctx.prev_state] : 'X'; | |
bac524d3 PZ |
1253 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
1254 | state_to_char[entry->ctx.next_state] : 'X'; | |
1255 | ||
bc0c38d1 | 1256 | comm = trace_find_cmdline(entry->ctx.next_pid); |
bac524d3 | 1257 | trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d:%c %s\n", |
214023c3 SR |
1258 | entry->ctx.prev_pid, |
1259 | entry->ctx.prev_prio, | |
57422797 | 1260 | S, entry->type == TRACE_CTX ? "==>" : " +", |
214023c3 SR |
1261 | entry->ctx.next_pid, |
1262 | entry->ctx.next_prio, | |
bac524d3 | 1263 | T, comm); |
bc0c38d1 | 1264 | break; |
f0a920d5 | 1265 | case TRACE_SPECIAL: |
88a4216c | 1266 | trace_seq_printf(s, "# %ld %ld %ld\n", |
f0a920d5 IM |
1267 | entry->special.arg1, |
1268 | entry->special.arg2, | |
1269 | entry->special.arg3); | |
1270 | break; | |
86387f7e IM |
1271 | case TRACE_STACK: |
1272 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { | |
1273 | if (i) | |
1274 | trace_seq_puts(s, " <= "); | |
1275 | seq_print_ip_sym(s, entry->stack.caller[i], sym_flags); | |
1276 | } | |
1277 | trace_seq_puts(s, "\n"); | |
1278 | break; | |
89b2f978 | 1279 | default: |
214023c3 | 1280 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
bc0c38d1 | 1281 | } |
f9896bf3 | 1282 | return 1; |
bc0c38d1 SR |
1283 | } |
1284 | ||
e309b41d | 1285 | static int print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 1286 | { |
214023c3 | 1287 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1288 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 1289 | struct trace_entry *entry; |
bc0c38d1 SR |
1290 | unsigned long usec_rem; |
1291 | unsigned long long t; | |
1292 | unsigned long secs; | |
1293 | char *comm; | |
b3806b43 | 1294 | int ret; |
bac524d3 | 1295 | int S, T; |
86387f7e | 1296 | int i; |
bc0c38d1 | 1297 | |
4e3c3333 IM |
1298 | entry = iter->ent; |
1299 | ||
bc0c38d1 SR |
1300 | comm = trace_find_cmdline(iter->ent->pid); |
1301 | ||
cdd31cd2 | 1302 | t = ns2usecs(entry->t); |
bc0c38d1 SR |
1303 | usec_rem = do_div(t, 1000000ULL); |
1304 | secs = (unsigned long)t; | |
1305 | ||
f29c73fe IM |
1306 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
1307 | if (!ret) | |
1308 | return 0; | |
1309 | ret = trace_seq_printf(s, "[%02d] ", iter->cpu); | |
1310 | if (!ret) | |
1311 | return 0; | |
1312 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); | |
1313 | if (!ret) | |
1314 | return 0; | |
bc0c38d1 SR |
1315 | |
1316 | switch (entry->type) { | |
1317 | case TRACE_FN: | |
b3806b43 SR |
1318 | ret = seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
1319 | if (!ret) | |
1320 | return 0; | |
bc0c38d1 SR |
1321 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
1322 | entry->fn.parent_ip) { | |
b3806b43 SR |
1323 | ret = trace_seq_printf(s, " <-"); |
1324 | if (!ret) | |
1325 | return 0; | |
1326 | ret = seq_print_ip_sym(s, entry->fn.parent_ip, | |
1327 | sym_flags); | |
1328 | if (!ret) | |
1329 | return 0; | |
bc0c38d1 | 1330 | } |
b3806b43 SR |
1331 | ret = trace_seq_printf(s, "\n"); |
1332 | if (!ret) | |
1333 | return 0; | |
bc0c38d1 SR |
1334 | break; |
1335 | case TRACE_CTX: | |
57422797 | 1336 | case TRACE_WAKE: |
bc0c38d1 SR |
1337 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
1338 | state_to_char[entry->ctx.prev_state] : 'X'; | |
bac524d3 PZ |
1339 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
1340 | state_to_char[entry->ctx.next_state] : 'X'; | |
1341 | ret = trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d:%c\n", | |
b3806b43 SR |
1342 | entry->ctx.prev_pid, |
1343 | entry->ctx.prev_prio, | |
1344 | S, | |
57422797 | 1345 | entry->type == TRACE_CTX ? "==>" : " +", |
b3806b43 | 1346 | entry->ctx.next_pid, |
bac524d3 PZ |
1347 | entry->ctx.next_prio, |
1348 | T); | |
b3806b43 SR |
1349 | if (!ret) |
1350 | return 0; | |
bc0c38d1 | 1351 | break; |
f0a920d5 | 1352 | case TRACE_SPECIAL: |
88a4216c | 1353 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
f0a920d5 IM |
1354 | entry->special.arg1, |
1355 | entry->special.arg2, | |
1356 | entry->special.arg3); | |
1357 | if (!ret) | |
1358 | return 0; | |
1359 | break; | |
86387f7e IM |
1360 | case TRACE_STACK: |
1361 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { | |
1362 | if (i) { | |
1363 | ret = trace_seq_puts(s, " <= "); | |
1364 | if (!ret) | |
1365 | return 0; | |
1366 | } | |
1367 | ret = seq_print_ip_sym(s, entry->stack.caller[i], | |
1368 | sym_flags); | |
1369 | if (!ret) | |
1370 | return 0; | |
1371 | } | |
1372 | ret = trace_seq_puts(s, "\n"); | |
1373 | if (!ret) | |
1374 | return 0; | |
1375 | break; | |
bc0c38d1 | 1376 | } |
b3806b43 | 1377 | return 1; |
bc0c38d1 SR |
1378 | } |
1379 | ||
e309b41d | 1380 | static int print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 IM |
1381 | { |
1382 | struct trace_seq *s = &iter->seq; | |
1383 | struct trace_entry *entry; | |
1384 | int ret; | |
bac524d3 | 1385 | int S, T; |
f9896bf3 IM |
1386 | |
1387 | entry = iter->ent; | |
1388 | ||
1389 | ret = trace_seq_printf(s, "%d %d %llu ", | |
1390 | entry->pid, iter->cpu, entry->t); | |
1391 | if (!ret) | |
1392 | return 0; | |
1393 | ||
1394 | switch (entry->type) { | |
1395 | case TRACE_FN: | |
1396 | ret = trace_seq_printf(s, "%x %x\n", | |
1397 | entry->fn.ip, entry->fn.parent_ip); | |
1398 | if (!ret) | |
1399 | return 0; | |
1400 | break; | |
1401 | case TRACE_CTX: | |
57422797 | 1402 | case TRACE_WAKE: |
f9896bf3 IM |
1403 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
1404 | state_to_char[entry->ctx.prev_state] : 'X'; | |
bac524d3 PZ |
1405 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
1406 | state_to_char[entry->ctx.next_state] : 'X'; | |
57422797 IM |
1407 | if (entry->type == TRACE_WAKE) |
1408 | S = '+'; | |
bac524d3 | 1409 | ret = trace_seq_printf(s, "%d %d %c %d %d %c\n", |
f9896bf3 IM |
1410 | entry->ctx.prev_pid, |
1411 | entry->ctx.prev_prio, | |
1412 | S, | |
1413 | entry->ctx.next_pid, | |
bac524d3 PZ |
1414 | entry->ctx.next_prio, |
1415 | T); | |
f9896bf3 IM |
1416 | if (!ret) |
1417 | return 0; | |
1418 | break; | |
f0a920d5 | 1419 | case TRACE_SPECIAL: |
86387f7e | 1420 | case TRACE_STACK: |
88a4216c | 1421 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
f0a920d5 IM |
1422 | entry->special.arg1, |
1423 | entry->special.arg2, | |
1424 | entry->special.arg3); | |
1425 | if (!ret) | |
1426 | return 0; | |
1427 | break; | |
f9896bf3 IM |
1428 | } |
1429 | return 1; | |
1430 | } | |
1431 | ||
cb0f12aa IM |
1432 | #define SEQ_PUT_FIELD_RET(s, x) \ |
1433 | do { \ | |
1434 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ | |
1435 | return 0; \ | |
1436 | } while (0) | |
1437 | ||
5e3ca0ec IM |
1438 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
1439 | do { \ | |
1440 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ | |
1441 | return 0; \ | |
1442 | } while (0) | |
1443 | ||
e309b41d | 1444 | static int print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec IM |
1445 | { |
1446 | struct trace_seq *s = &iter->seq; | |
1447 | unsigned char newline = '\n'; | |
1448 | struct trace_entry *entry; | |
bac524d3 | 1449 | int S, T; |
5e3ca0ec IM |
1450 | |
1451 | entry = iter->ent; | |
1452 | ||
1453 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); | |
1454 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); | |
1455 | SEQ_PUT_HEX_FIELD_RET(s, entry->t); | |
1456 | ||
1457 | switch (entry->type) { | |
1458 | case TRACE_FN: | |
1459 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.ip); | |
1460 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); | |
1461 | break; | |
1462 | case TRACE_CTX: | |
57422797 | 1463 | case TRACE_WAKE: |
5e3ca0ec IM |
1464 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
1465 | state_to_char[entry->ctx.prev_state] : 'X'; | |
bac524d3 PZ |
1466 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
1467 | state_to_char[entry->ctx.next_state] : 'X'; | |
57422797 IM |
1468 | if (entry->type == TRACE_WAKE) |
1469 | S = '+'; | |
5e3ca0ec IM |
1470 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_pid); |
1471 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_prio); | |
1472 | SEQ_PUT_HEX_FIELD_RET(s, S); | |
1473 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_pid); | |
1474 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_prio); | |
1475 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); | |
bac524d3 | 1476 | SEQ_PUT_HEX_FIELD_RET(s, T); |
5e3ca0ec IM |
1477 | break; |
1478 | case TRACE_SPECIAL: | |
86387f7e | 1479 | case TRACE_STACK: |
5e3ca0ec IM |
1480 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg1); |
1481 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg2); | |
1482 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg3); | |
1483 | break; | |
1484 | } | |
1485 | SEQ_PUT_FIELD_RET(s, newline); | |
1486 | ||
1487 | return 1; | |
1488 | } | |
1489 | ||
e309b41d | 1490 | static int print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa IM |
1491 | { |
1492 | struct trace_seq *s = &iter->seq; | |
1493 | struct trace_entry *entry; | |
1494 | ||
1495 | entry = iter->ent; | |
1496 | ||
1497 | SEQ_PUT_FIELD_RET(s, entry->pid); | |
1498 | SEQ_PUT_FIELD_RET(s, entry->cpu); | |
1499 | SEQ_PUT_FIELD_RET(s, entry->t); | |
1500 | ||
1501 | switch (entry->type) { | |
1502 | case TRACE_FN: | |
1503 | SEQ_PUT_FIELD_RET(s, entry->fn.ip); | |
1504 | SEQ_PUT_FIELD_RET(s, entry->fn.parent_ip); | |
1505 | break; | |
1506 | case TRACE_CTX: | |
1507 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_pid); | |
1508 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_prio); | |
1509 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_state); | |
1510 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_pid); | |
1511 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_prio); | |
bac524d3 | 1512 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_state); |
cb0f12aa | 1513 | break; |
f0a920d5 | 1514 | case TRACE_SPECIAL: |
86387f7e | 1515 | case TRACE_STACK: |
f0a920d5 IM |
1516 | SEQ_PUT_FIELD_RET(s, entry->special.arg1); |
1517 | SEQ_PUT_FIELD_RET(s, entry->special.arg2); | |
1518 | SEQ_PUT_FIELD_RET(s, entry->special.arg3); | |
1519 | break; | |
cb0f12aa IM |
1520 | } |
1521 | return 1; | |
1522 | } | |
1523 | ||
bc0c38d1 SR |
1524 | static int trace_empty(struct trace_iterator *iter) |
1525 | { | |
1526 | struct trace_array_cpu *data; | |
1527 | int cpu; | |
1528 | ||
1529 | for_each_possible_cpu(cpu) { | |
1530 | data = iter->tr->data[cpu]; | |
1531 | ||
b3806b43 SR |
1532 | if (head_page(data) && data->trace_idx && |
1533 | (data->trace_tail != data->trace_head || | |
1534 | data->trace_tail_idx != data->trace_head_idx)) | |
bc0c38d1 SR |
1535 | return 0; |
1536 | } | |
1537 | return 1; | |
1538 | } | |
1539 | ||
f9896bf3 IM |
1540 | static int print_trace_line(struct trace_iterator *iter) |
1541 | { | |
cb0f12aa IM |
1542 | if (trace_flags & TRACE_ITER_BIN) |
1543 | return print_bin_fmt(iter); | |
1544 | ||
5e3ca0ec IM |
1545 | if (trace_flags & TRACE_ITER_HEX) |
1546 | return print_hex_fmt(iter); | |
1547 | ||
f9896bf3 IM |
1548 | if (trace_flags & TRACE_ITER_RAW) |
1549 | return print_raw_fmt(iter); | |
1550 | ||
1551 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
1552 | return print_lat_fmt(iter, iter->idx, iter->cpu); | |
1553 | ||
1554 | return print_trace_fmt(iter); | |
1555 | } | |
1556 | ||
bc0c38d1 SR |
1557 | static int s_show(struct seq_file *m, void *v) |
1558 | { | |
1559 | struct trace_iterator *iter = v; | |
1560 | ||
1561 | if (iter->ent == NULL) { | |
1562 | if (iter->tr) { | |
1563 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
1564 | seq_puts(m, "#\n"); | |
1565 | } | |
1566 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { | |
1567 | /* print nothing if the buffers are empty */ | |
1568 | if (trace_empty(iter)) | |
1569 | return 0; | |
1570 | print_trace_header(m, iter); | |
1571 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1572 | print_lat_help_header(m); | |
1573 | } else { | |
1574 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1575 | print_func_help_header(m); | |
1576 | } | |
1577 | } else { | |
f9896bf3 | 1578 | print_trace_line(iter); |
214023c3 | 1579 | trace_print_seq(m, &iter->seq); |
bc0c38d1 SR |
1580 | } |
1581 | ||
1582 | return 0; | |
1583 | } | |
1584 | ||
1585 | static struct seq_operations tracer_seq_ops = { | |
4bf39a94 IM |
1586 | .start = s_start, |
1587 | .next = s_next, | |
1588 | .stop = s_stop, | |
1589 | .show = s_show, | |
bc0c38d1 SR |
1590 | }; |
1591 | ||
e309b41d | 1592 | static struct trace_iterator * |
bc0c38d1 SR |
1593 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
1594 | { | |
1595 | struct trace_iterator *iter; | |
1596 | ||
60a11774 SR |
1597 | if (tracing_disabled) { |
1598 | *ret = -ENODEV; | |
1599 | return NULL; | |
1600 | } | |
1601 | ||
bc0c38d1 SR |
1602 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
1603 | if (!iter) { | |
1604 | *ret = -ENOMEM; | |
1605 | goto out; | |
1606 | } | |
1607 | ||
1608 | mutex_lock(&trace_types_lock); | |
1609 | if (current_trace && current_trace->print_max) | |
1610 | iter->tr = &max_tr; | |
1611 | else | |
1612 | iter->tr = inode->i_private; | |
1613 | iter->trace = current_trace; | |
1614 | iter->pos = -1; | |
1615 | ||
1616 | /* TODO stop tracer */ | |
1617 | *ret = seq_open(file, &tracer_seq_ops); | |
1618 | if (!*ret) { | |
1619 | struct seq_file *m = file->private_data; | |
1620 | m->private = iter; | |
1621 | ||
1622 | /* stop the trace while dumping */ | |
1623 | if (iter->tr->ctrl) | |
1624 | tracer_enabled = 0; | |
1625 | ||
1626 | if (iter->trace && iter->trace->open) | |
1627 | iter->trace->open(iter); | |
1628 | } else { | |
1629 | kfree(iter); | |
1630 | iter = NULL; | |
1631 | } | |
1632 | mutex_unlock(&trace_types_lock); | |
1633 | ||
1634 | out: | |
1635 | return iter; | |
1636 | } | |
1637 | ||
1638 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
1639 | { | |
60a11774 SR |
1640 | if (tracing_disabled) |
1641 | return -ENODEV; | |
1642 | ||
bc0c38d1 SR |
1643 | filp->private_data = inode->i_private; |
1644 | return 0; | |
1645 | } | |
1646 | ||
1647 | int tracing_release(struct inode *inode, struct file *file) | |
1648 | { | |
1649 | struct seq_file *m = (struct seq_file *)file->private_data; | |
1650 | struct trace_iterator *iter = m->private; | |
1651 | ||
1652 | mutex_lock(&trace_types_lock); | |
1653 | if (iter->trace && iter->trace->close) | |
1654 | iter->trace->close(iter); | |
1655 | ||
1656 | /* reenable tracing if it was previously enabled */ | |
1657 | if (iter->tr->ctrl) | |
1658 | tracer_enabled = 1; | |
1659 | mutex_unlock(&trace_types_lock); | |
1660 | ||
1661 | seq_release(inode, file); | |
1662 | kfree(iter); | |
1663 | return 0; | |
1664 | } | |
1665 | ||
1666 | static int tracing_open(struct inode *inode, struct file *file) | |
1667 | { | |
1668 | int ret; | |
1669 | ||
1670 | __tracing_open(inode, file, &ret); | |
1671 | ||
1672 | return ret; | |
1673 | } | |
1674 | ||
1675 | static int tracing_lt_open(struct inode *inode, struct file *file) | |
1676 | { | |
1677 | struct trace_iterator *iter; | |
1678 | int ret; | |
1679 | ||
1680 | iter = __tracing_open(inode, file, &ret); | |
1681 | ||
1682 | if (!ret) | |
1683 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
1684 | ||
1685 | return ret; | |
1686 | } | |
1687 | ||
1688 | ||
e309b41d | 1689 | static void * |
bc0c38d1 SR |
1690 | t_next(struct seq_file *m, void *v, loff_t *pos) |
1691 | { | |
1692 | struct tracer *t = m->private; | |
1693 | ||
1694 | (*pos)++; | |
1695 | ||
1696 | if (t) | |
1697 | t = t->next; | |
1698 | ||
1699 | m->private = t; | |
1700 | ||
1701 | return t; | |
1702 | } | |
1703 | ||
1704 | static void *t_start(struct seq_file *m, loff_t *pos) | |
1705 | { | |
1706 | struct tracer *t = m->private; | |
1707 | loff_t l = 0; | |
1708 | ||
1709 | mutex_lock(&trace_types_lock); | |
1710 | for (; t && l < *pos; t = t_next(m, t, &l)) | |
1711 | ; | |
1712 | ||
1713 | return t; | |
1714 | } | |
1715 | ||
1716 | static void t_stop(struct seq_file *m, void *p) | |
1717 | { | |
1718 | mutex_unlock(&trace_types_lock); | |
1719 | } | |
1720 | ||
1721 | static int t_show(struct seq_file *m, void *v) | |
1722 | { | |
1723 | struct tracer *t = v; | |
1724 | ||
1725 | if (!t) | |
1726 | return 0; | |
1727 | ||
1728 | seq_printf(m, "%s", t->name); | |
1729 | if (t->next) | |
1730 | seq_putc(m, ' '); | |
1731 | else | |
1732 | seq_putc(m, '\n'); | |
1733 | ||
1734 | return 0; | |
1735 | } | |
1736 | ||
1737 | static struct seq_operations show_traces_seq_ops = { | |
4bf39a94 IM |
1738 | .start = t_start, |
1739 | .next = t_next, | |
1740 | .stop = t_stop, | |
1741 | .show = t_show, | |
bc0c38d1 SR |
1742 | }; |
1743 | ||
1744 | static int show_traces_open(struct inode *inode, struct file *file) | |
1745 | { | |
1746 | int ret; | |
1747 | ||
60a11774 SR |
1748 | if (tracing_disabled) |
1749 | return -ENODEV; | |
1750 | ||
bc0c38d1 SR |
1751 | ret = seq_open(file, &show_traces_seq_ops); |
1752 | if (!ret) { | |
1753 | struct seq_file *m = file->private_data; | |
1754 | m->private = trace_types; | |
1755 | } | |
1756 | ||
1757 | return ret; | |
1758 | } | |
1759 | ||
1760 | static struct file_operations tracing_fops = { | |
4bf39a94 IM |
1761 | .open = tracing_open, |
1762 | .read = seq_read, | |
1763 | .llseek = seq_lseek, | |
1764 | .release = tracing_release, | |
bc0c38d1 SR |
1765 | }; |
1766 | ||
1767 | static struct file_operations tracing_lt_fops = { | |
4bf39a94 IM |
1768 | .open = tracing_lt_open, |
1769 | .read = seq_read, | |
1770 | .llseek = seq_lseek, | |
1771 | .release = tracing_release, | |
bc0c38d1 SR |
1772 | }; |
1773 | ||
1774 | static struct file_operations show_traces_fops = { | |
c7078de1 IM |
1775 | .open = show_traces_open, |
1776 | .read = seq_read, | |
1777 | .release = seq_release, | |
1778 | }; | |
1779 | ||
36dfe925 IM |
1780 | /* |
1781 | * Only trace on a CPU if the bitmask is set: | |
1782 | */ | |
1783 | static cpumask_t tracing_cpumask = CPU_MASK_ALL; | |
1784 | ||
1785 | /* | |
1786 | * When tracing/tracing_cpu_mask is modified then this holds | |
1787 | * the new bitmask we are about to install: | |
1788 | */ | |
1789 | static cpumask_t tracing_cpumask_new; | |
1790 | ||
1791 | /* | |
1792 | * The tracer itself will not take this lock, but still we want | |
1793 | * to provide a consistent cpumask to user-space: | |
1794 | */ | |
1795 | static DEFINE_MUTEX(tracing_cpumask_update_lock); | |
1796 | ||
1797 | /* | |
1798 | * Temporary storage for the character representation of the | |
1799 | * CPU bitmask (and one more byte for the newline): | |
1800 | */ | |
1801 | static char mask_str[NR_CPUS + 1]; | |
1802 | ||
c7078de1 IM |
1803 | static ssize_t |
1804 | tracing_cpumask_read(struct file *filp, char __user *ubuf, | |
1805 | size_t count, loff_t *ppos) | |
1806 | { | |
36dfe925 | 1807 | int len; |
c7078de1 IM |
1808 | |
1809 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 IM |
1810 | |
1811 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); | |
1812 | if (count - len < 2) { | |
1813 | count = -EINVAL; | |
1814 | goto out_err; | |
1815 | } | |
1816 | len += sprintf(mask_str + len, "\n"); | |
1817 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); | |
1818 | ||
1819 | out_err: | |
c7078de1 IM |
1820 | mutex_unlock(&tracing_cpumask_update_lock); |
1821 | ||
1822 | return count; | |
1823 | } | |
1824 | ||
1825 | static ssize_t | |
1826 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, | |
1827 | size_t count, loff_t *ppos) | |
1828 | { | |
36dfe925 | 1829 | int err, cpu; |
c7078de1 IM |
1830 | |
1831 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 | 1832 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
c7078de1 | 1833 | if (err) |
36dfe925 IM |
1834 | goto err_unlock; |
1835 | ||
92205c23 SR |
1836 | raw_local_irq_disable(); |
1837 | __raw_spin_lock(&ftrace_max_lock); | |
36dfe925 IM |
1838 | for_each_possible_cpu(cpu) { |
1839 | /* | |
1840 | * Increase/decrease the disabled counter if we are | |
1841 | * about to flip a bit in the cpumask: | |
1842 | */ | |
1843 | if (cpu_isset(cpu, tracing_cpumask) && | |
1844 | !cpu_isset(cpu, tracing_cpumask_new)) { | |
1845 | atomic_inc(&global_trace.data[cpu]->disabled); | |
1846 | } | |
1847 | if (!cpu_isset(cpu, tracing_cpumask) && | |
1848 | cpu_isset(cpu, tracing_cpumask_new)) { | |
1849 | atomic_dec(&global_trace.data[cpu]->disabled); | |
1850 | } | |
1851 | } | |
92205c23 SR |
1852 | __raw_spin_unlock(&ftrace_max_lock); |
1853 | raw_local_irq_enable(); | |
36dfe925 IM |
1854 | |
1855 | tracing_cpumask = tracing_cpumask_new; | |
1856 | ||
1857 | mutex_unlock(&tracing_cpumask_update_lock); | |
c7078de1 IM |
1858 | |
1859 | return count; | |
36dfe925 IM |
1860 | |
1861 | err_unlock: | |
1862 | mutex_unlock(&tracing_cpumask_update_lock); | |
1863 | ||
1864 | return err; | |
c7078de1 IM |
1865 | } |
1866 | ||
1867 | static struct file_operations tracing_cpumask_fops = { | |
1868 | .open = tracing_open_generic, | |
1869 | .read = tracing_cpumask_read, | |
1870 | .write = tracing_cpumask_write, | |
bc0c38d1 SR |
1871 | }; |
1872 | ||
1873 | static ssize_t | |
1874 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, | |
1875 | size_t cnt, loff_t *ppos) | |
1876 | { | |
1877 | char *buf; | |
1878 | int r = 0; | |
1879 | int len = 0; | |
1880 | int i; | |
1881 | ||
1882 | /* calulate max size */ | |
1883 | for (i = 0; trace_options[i]; i++) { | |
1884 | len += strlen(trace_options[i]); | |
1885 | len += 3; /* "no" and space */ | |
1886 | } | |
1887 | ||
1888 | /* +2 for \n and \0 */ | |
1889 | buf = kmalloc(len + 2, GFP_KERNEL); | |
1890 | if (!buf) | |
1891 | return -ENOMEM; | |
1892 | ||
1893 | for (i = 0; trace_options[i]; i++) { | |
1894 | if (trace_flags & (1 << i)) | |
1895 | r += sprintf(buf + r, "%s ", trace_options[i]); | |
1896 | else | |
1897 | r += sprintf(buf + r, "no%s ", trace_options[i]); | |
1898 | } | |
1899 | ||
1900 | r += sprintf(buf + r, "\n"); | |
1901 | WARN_ON(r >= len + 2); | |
1902 | ||
36dfe925 | 1903 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
1904 | |
1905 | kfree(buf); | |
1906 | ||
1907 | return r; | |
1908 | } | |
1909 | ||
1910 | static ssize_t | |
1911 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, | |
1912 | size_t cnt, loff_t *ppos) | |
1913 | { | |
1914 | char buf[64]; | |
1915 | char *cmp = buf; | |
1916 | int neg = 0; | |
1917 | int i; | |
1918 | ||
1919 | if (cnt > 63) | |
1920 | cnt = 63; | |
1921 | ||
1922 | if (copy_from_user(&buf, ubuf, cnt)) | |
1923 | return -EFAULT; | |
1924 | ||
1925 | buf[cnt] = 0; | |
1926 | ||
1927 | if (strncmp(buf, "no", 2) == 0) { | |
1928 | neg = 1; | |
1929 | cmp += 2; | |
1930 | } | |
1931 | ||
1932 | for (i = 0; trace_options[i]; i++) { | |
1933 | int len = strlen(trace_options[i]); | |
1934 | ||
1935 | if (strncmp(cmp, trace_options[i], len) == 0) { | |
1936 | if (neg) | |
1937 | trace_flags &= ~(1 << i); | |
1938 | else | |
1939 | trace_flags |= (1 << i); | |
1940 | break; | |
1941 | } | |
1942 | } | |
442e544c IM |
1943 | /* |
1944 | * If no option could be set, return an error: | |
1945 | */ | |
1946 | if (!trace_options[i]) | |
1947 | return -EINVAL; | |
bc0c38d1 SR |
1948 | |
1949 | filp->f_pos += cnt; | |
1950 | ||
1951 | return cnt; | |
1952 | } | |
1953 | ||
1954 | static struct file_operations tracing_iter_fops = { | |
c7078de1 IM |
1955 | .open = tracing_open_generic, |
1956 | .read = tracing_iter_ctrl_read, | |
1957 | .write = tracing_iter_ctrl_write, | |
bc0c38d1 SR |
1958 | }; |
1959 | ||
7bd2f24c IM |
1960 | static const char readme_msg[] = |
1961 | "tracing mini-HOWTO:\n\n" | |
1962 | "# mkdir /debug\n" | |
1963 | "# mount -t debugfs nodev /debug\n\n" | |
1964 | "# cat /debug/tracing/available_tracers\n" | |
1965 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" | |
1966 | "# cat /debug/tracing/current_tracer\n" | |
1967 | "none\n" | |
1968 | "# echo sched_switch > /debug/tracing/current_tracer\n" | |
1969 | "# cat /debug/tracing/current_tracer\n" | |
1970 | "sched_switch\n" | |
1971 | "# cat /debug/tracing/iter_ctrl\n" | |
1972 | "noprint-parent nosym-offset nosym-addr noverbose\n" | |
1973 | "# echo print-parent > /debug/tracing/iter_ctrl\n" | |
1974 | "# echo 1 > /debug/tracing/tracing_enabled\n" | |
1975 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" | |
1976 | "echo 0 > /debug/tracing/tracing_enabled\n" | |
1977 | ; | |
1978 | ||
1979 | static ssize_t | |
1980 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
1981 | size_t cnt, loff_t *ppos) | |
1982 | { | |
1983 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
1984 | readme_msg, strlen(readme_msg)); | |
1985 | } | |
1986 | ||
1987 | static struct file_operations tracing_readme_fops = { | |
c7078de1 IM |
1988 | .open = tracing_open_generic, |
1989 | .read = tracing_readme_read, | |
7bd2f24c IM |
1990 | }; |
1991 | ||
bc0c38d1 SR |
1992 | static ssize_t |
1993 | tracing_ctrl_read(struct file *filp, char __user *ubuf, | |
1994 | size_t cnt, loff_t *ppos) | |
1995 | { | |
1996 | struct trace_array *tr = filp->private_data; | |
1997 | char buf[64]; | |
1998 | int r; | |
1999 | ||
2000 | r = sprintf(buf, "%ld\n", tr->ctrl); | |
4e3c3333 | 2001 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2002 | } |
2003 | ||
2004 | static ssize_t | |
2005 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, | |
2006 | size_t cnt, loff_t *ppos) | |
2007 | { | |
2008 | struct trace_array *tr = filp->private_data; | |
2009 | long val; | |
2010 | char buf[64]; | |
2011 | ||
2012 | if (cnt > 63) | |
2013 | cnt = 63; | |
2014 | ||
2015 | if (copy_from_user(&buf, ubuf, cnt)) | |
2016 | return -EFAULT; | |
2017 | ||
2018 | buf[cnt] = 0; | |
2019 | ||
2020 | val = simple_strtoul(buf, NULL, 10); | |
2021 | ||
2022 | val = !!val; | |
2023 | ||
2024 | mutex_lock(&trace_types_lock); | |
2025 | if (tr->ctrl ^ val) { | |
2026 | if (val) | |
2027 | tracer_enabled = 1; | |
2028 | else | |
2029 | tracer_enabled = 0; | |
2030 | ||
2031 | tr->ctrl = val; | |
2032 | ||
2033 | if (current_trace && current_trace->ctrl_update) | |
2034 | current_trace->ctrl_update(tr); | |
2035 | } | |
2036 | mutex_unlock(&trace_types_lock); | |
2037 | ||
2038 | filp->f_pos += cnt; | |
2039 | ||
2040 | return cnt; | |
2041 | } | |
2042 | ||
2043 | static ssize_t | |
2044 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
2045 | size_t cnt, loff_t *ppos) | |
2046 | { | |
2047 | char buf[max_tracer_type_len+2]; | |
2048 | int r; | |
2049 | ||
2050 | mutex_lock(&trace_types_lock); | |
2051 | if (current_trace) | |
2052 | r = sprintf(buf, "%s\n", current_trace->name); | |
2053 | else | |
2054 | r = sprintf(buf, "\n"); | |
2055 | mutex_unlock(&trace_types_lock); | |
2056 | ||
4bf39a94 | 2057 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2058 | } |
2059 | ||
2060 | static ssize_t | |
2061 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
2062 | size_t cnt, loff_t *ppos) | |
2063 | { | |
2064 | struct trace_array *tr = &global_trace; | |
2065 | struct tracer *t; | |
2066 | char buf[max_tracer_type_len+1]; | |
2067 | int i; | |
2068 | ||
2069 | if (cnt > max_tracer_type_len) | |
2070 | cnt = max_tracer_type_len; | |
2071 | ||
2072 | if (copy_from_user(&buf, ubuf, cnt)) | |
2073 | return -EFAULT; | |
2074 | ||
2075 | buf[cnt] = 0; | |
2076 | ||
2077 | /* strip ending whitespace. */ | |
2078 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
2079 | buf[i] = 0; | |
2080 | ||
2081 | mutex_lock(&trace_types_lock); | |
2082 | for (t = trace_types; t; t = t->next) { | |
2083 | if (strcmp(t->name, buf) == 0) | |
2084 | break; | |
2085 | } | |
2086 | if (!t || t == current_trace) | |
2087 | goto out; | |
2088 | ||
2089 | if (current_trace && current_trace->reset) | |
2090 | current_trace->reset(tr); | |
2091 | ||
2092 | current_trace = t; | |
2093 | if (t->init) | |
2094 | t->init(tr); | |
2095 | ||
2096 | out: | |
2097 | mutex_unlock(&trace_types_lock); | |
2098 | ||
2099 | filp->f_pos += cnt; | |
2100 | ||
2101 | return cnt; | |
2102 | } | |
2103 | ||
2104 | static ssize_t | |
2105 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
2106 | size_t cnt, loff_t *ppos) | |
2107 | { | |
2108 | unsigned long *ptr = filp->private_data; | |
2109 | char buf[64]; | |
2110 | int r; | |
2111 | ||
2112 | r = snprintf(buf, 64, "%ld\n", | |
2113 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); | |
2114 | if (r > 64) | |
2115 | r = 64; | |
4bf39a94 | 2116 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2117 | } |
2118 | ||
2119 | static ssize_t | |
2120 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
2121 | size_t cnt, loff_t *ppos) | |
2122 | { | |
2123 | long *ptr = filp->private_data; | |
2124 | long val; | |
2125 | char buf[64]; | |
2126 | ||
2127 | if (cnt > 63) | |
2128 | cnt = 63; | |
2129 | ||
2130 | if (copy_from_user(&buf, ubuf, cnt)) | |
2131 | return -EFAULT; | |
2132 | ||
2133 | buf[cnt] = 0; | |
2134 | ||
2135 | val = simple_strtoul(buf, NULL, 10); | |
2136 | ||
2137 | *ptr = val * 1000; | |
2138 | ||
2139 | return cnt; | |
2140 | } | |
2141 | ||
b3806b43 SR |
2142 | static atomic_t tracing_reader; |
2143 | ||
2144 | static int tracing_open_pipe(struct inode *inode, struct file *filp) | |
2145 | { | |
2146 | struct trace_iterator *iter; | |
2147 | ||
2148 | if (tracing_disabled) | |
2149 | return -ENODEV; | |
2150 | ||
2151 | /* We only allow for reader of the pipe */ | |
2152 | if (atomic_inc_return(&tracing_reader) != 1) { | |
2153 | atomic_dec(&tracing_reader); | |
2154 | return -EBUSY; | |
2155 | } | |
2156 | ||
2157 | /* create a buffer to store the information to pass to userspace */ | |
2158 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
2159 | if (!iter) | |
2160 | return -ENOMEM; | |
2161 | ||
2162 | iter->tr = &global_trace; | |
2163 | ||
2164 | filp->private_data = iter; | |
2165 | ||
2166 | return 0; | |
2167 | } | |
2168 | ||
2169 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
2170 | { | |
2171 | struct trace_iterator *iter = file->private_data; | |
2172 | ||
2173 | kfree(iter); | |
2174 | atomic_dec(&tracing_reader); | |
2175 | ||
2176 | return 0; | |
2177 | } | |
2178 | ||
2a2cc8f7 SSP |
2179 | static unsigned int |
2180 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) | |
2181 | { | |
2182 | struct trace_iterator *iter = filp->private_data; | |
2183 | ||
2184 | if (trace_flags & TRACE_ITER_BLOCK) { | |
2185 | /* | |
2186 | * Always select as readable when in blocking mode | |
2187 | */ | |
2188 | return POLLIN | POLLRDNORM; | |
2189 | } | |
2190 | else { | |
2191 | if (!trace_empty(iter)) | |
2192 | return POLLIN | POLLRDNORM; | |
2193 | poll_wait(filp, &trace_wait, poll_table); | |
2194 | if (!trace_empty(iter)) | |
2195 | return POLLIN | POLLRDNORM; | |
2196 | ||
2197 | return 0; | |
2198 | } | |
2199 | } | |
2200 | ||
b3806b43 SR |
2201 | /* |
2202 | * Consumer reader. | |
2203 | */ | |
2204 | static ssize_t | |
2205 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
2206 | size_t cnt, loff_t *ppos) | |
2207 | { | |
2208 | struct trace_iterator *iter = filp->private_data; | |
2209 | struct trace_array_cpu *data; | |
2210 | static cpumask_t mask; | |
b3806b43 SR |
2211 | static int start; |
2212 | unsigned long flags; | |
25770467 | 2213 | #ifdef CONFIG_FTRACE |
2e0f5761 | 2214 | int ftrace_save; |
25770467 | 2215 | #endif |
b3806b43 SR |
2216 | int read = 0; |
2217 | int cpu; | |
2218 | int len; | |
2219 | int ret; | |
2220 | ||
2221 | /* return any leftover data */ | |
2222 | if (iter->seq.len > start) { | |
2223 | len = iter->seq.len - start; | |
2224 | if (cnt > len) | |
2225 | cnt = len; | |
2226 | ret = copy_to_user(ubuf, iter->seq.buffer + start, cnt); | |
2227 | if (ret) | |
2228 | cnt = -EFAULT; | |
2229 | ||
2230 | start += len; | |
2231 | ||
2232 | return cnt; | |
2233 | } | |
2234 | ||
2235 | trace_seq_reset(&iter->seq); | |
2236 | start = 0; | |
2237 | ||
2238 | while (trace_empty(iter)) { | |
2a2cc8f7 SSP |
2239 | if (!(trace_flags & TRACE_ITER_BLOCK)) |
2240 | return -EWOULDBLOCK; | |
b3806b43 SR |
2241 | /* |
2242 | * This is a make-shift waitqueue. The reason we don't use | |
2243 | * an actual wait queue is because: | |
2244 | * 1) we only ever have one waiter | |
2245 | * 2) the tracing, traces all functions, we don't want | |
2246 | * the overhead of calling wake_up and friends | |
2247 | * (and tracing them too) | |
2248 | * Anyway, this is really very primitive wakeup. | |
2249 | */ | |
2250 | set_current_state(TASK_INTERRUPTIBLE); | |
2251 | iter->tr->waiter = current; | |
2252 | ||
2253 | /* sleep for one second, and try again. */ | |
2254 | schedule_timeout(HZ); | |
2255 | ||
2256 | iter->tr->waiter = NULL; | |
2257 | ||
2258 | if (signal_pending(current)) | |
2259 | return -EINTR; | |
2260 | ||
2261 | /* | |
2262 | * We block until we read something and tracing is disabled. | |
2263 | * We still block if tracing is disabled, but we have never | |
2264 | * read anything. This allows a user to cat this file, and | |
2265 | * then enable tracing. But after we have read something, | |
2266 | * we give an EOF when tracing is again disabled. | |
2267 | * | |
2268 | * iter->pos will be 0 if we haven't read anything. | |
2269 | */ | |
2270 | if (!tracer_enabled && iter->pos) | |
2271 | break; | |
2272 | ||
2273 | continue; | |
2274 | } | |
2275 | ||
2276 | /* stop when tracing is finished */ | |
2277 | if (trace_empty(iter)) | |
2278 | return 0; | |
2279 | ||
2280 | if (cnt >= PAGE_SIZE) | |
2281 | cnt = PAGE_SIZE - 1; | |
2282 | ||
2283 | memset(iter, 0, sizeof(*iter)); | |
2284 | iter->tr = &global_trace; | |
2285 | iter->pos = -1; | |
2286 | ||
2287 | /* | |
2288 | * We need to stop all tracing on all CPUS to read the | |
2289 | * the next buffer. This is a bit expensive, but is | |
2290 | * not done often. We fill all what we can read, | |
2291 | * and then release the locks again. | |
2292 | */ | |
2293 | ||
2294 | cpus_clear(mask); | |
2295 | local_irq_save(flags); | |
25770467 | 2296 | #ifdef CONFIG_FTRACE |
2e0f5761 IM |
2297 | ftrace_save = ftrace_enabled; |
2298 | ftrace_enabled = 0; | |
25770467 | 2299 | #endif |
2e0f5761 | 2300 | smp_wmb(); |
b3806b43 SR |
2301 | for_each_possible_cpu(cpu) { |
2302 | data = iter->tr->data[cpu]; | |
2303 | ||
2304 | if (!head_page(data) || !data->trace_idx) | |
2305 | continue; | |
2306 | ||
2307 | atomic_inc(&data->disabled); | |
b3806b43 SR |
2308 | cpu_set(cpu, mask); |
2309 | } | |
2310 | ||
2e0f5761 IM |
2311 | for_each_cpu_mask(cpu, mask) { |
2312 | data = iter->tr->data[cpu]; | |
92205c23 | 2313 | __raw_spin_lock(&data->lock); |
2e0f5761 IM |
2314 | } |
2315 | ||
088b1e42 SR |
2316 | while (find_next_entry_inc(iter) != NULL) { |
2317 | int len = iter->seq.len; | |
2318 | ||
f9896bf3 | 2319 | ret = print_trace_line(iter); |
088b1e42 SR |
2320 | if (!ret) { |
2321 | /* don't print partial lines */ | |
2322 | iter->seq.len = len; | |
b3806b43 | 2323 | break; |
088b1e42 | 2324 | } |
b3806b43 SR |
2325 | |
2326 | trace_consume(iter); | |
2327 | ||
2328 | if (iter->seq.len >= cnt) | |
2329 | break; | |
b3806b43 SR |
2330 | } |
2331 | ||
d4c5a2f5 | 2332 | for_each_cpu_mask(cpu, mask) { |
b3806b43 | 2333 | data = iter->tr->data[cpu]; |
92205c23 | 2334 | __raw_spin_unlock(&data->lock); |
2e0f5761 IM |
2335 | } |
2336 | ||
2337 | for_each_cpu_mask(cpu, mask) { | |
2338 | data = iter->tr->data[cpu]; | |
b3806b43 SR |
2339 | atomic_dec(&data->disabled); |
2340 | } | |
25770467 | 2341 | #ifdef CONFIG_FTRACE |
2e0f5761 | 2342 | ftrace_enabled = ftrace_save; |
25770467 | 2343 | #endif |
b3806b43 SR |
2344 | local_irq_restore(flags); |
2345 | ||
2346 | /* Now copy what we have to the user */ | |
2347 | read = iter->seq.len; | |
2348 | if (read > cnt) | |
2349 | read = cnt; | |
2350 | ||
2351 | ret = copy_to_user(ubuf, iter->seq.buffer, read); | |
2352 | ||
2353 | if (read < iter->seq.len) | |
2354 | start = read; | |
2355 | else | |
2356 | trace_seq_reset(&iter->seq); | |
2357 | ||
2358 | if (ret) | |
2359 | read = -EFAULT; | |
2360 | ||
2361 | return read; | |
2362 | } | |
2363 | ||
bc0c38d1 | 2364 | static struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
2365 | .open = tracing_open_generic, |
2366 | .read = tracing_max_lat_read, | |
2367 | .write = tracing_max_lat_write, | |
bc0c38d1 SR |
2368 | }; |
2369 | ||
2370 | static struct file_operations tracing_ctrl_fops = { | |
4bf39a94 IM |
2371 | .open = tracing_open_generic, |
2372 | .read = tracing_ctrl_read, | |
2373 | .write = tracing_ctrl_write, | |
bc0c38d1 SR |
2374 | }; |
2375 | ||
2376 | static struct file_operations set_tracer_fops = { | |
4bf39a94 IM |
2377 | .open = tracing_open_generic, |
2378 | .read = tracing_set_trace_read, | |
2379 | .write = tracing_set_trace_write, | |
bc0c38d1 SR |
2380 | }; |
2381 | ||
b3806b43 | 2382 | static struct file_operations tracing_pipe_fops = { |
4bf39a94 | 2383 | .open = tracing_open_pipe, |
2a2cc8f7 | 2384 | .poll = tracing_poll_pipe, |
4bf39a94 IM |
2385 | .read = tracing_read_pipe, |
2386 | .release = tracing_release_pipe, | |
b3806b43 SR |
2387 | }; |
2388 | ||
bc0c38d1 SR |
2389 | #ifdef CONFIG_DYNAMIC_FTRACE |
2390 | ||
2391 | static ssize_t | |
2392 | tracing_read_long(struct file *filp, char __user *ubuf, | |
2393 | size_t cnt, loff_t *ppos) | |
2394 | { | |
2395 | unsigned long *p = filp->private_data; | |
2396 | char buf[64]; | |
2397 | int r; | |
2398 | ||
2399 | r = sprintf(buf, "%ld\n", *p); | |
4bf39a94 IM |
2400 | |
2401 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
bc0c38d1 SR |
2402 | } |
2403 | ||
2404 | static struct file_operations tracing_read_long_fops = { | |
4bf39a94 IM |
2405 | .open = tracing_open_generic, |
2406 | .read = tracing_read_long, | |
bc0c38d1 SR |
2407 | }; |
2408 | #endif | |
2409 | ||
2410 | static struct dentry *d_tracer; | |
2411 | ||
2412 | struct dentry *tracing_init_dentry(void) | |
2413 | { | |
2414 | static int once; | |
2415 | ||
2416 | if (d_tracer) | |
2417 | return d_tracer; | |
2418 | ||
2419 | d_tracer = debugfs_create_dir("tracing", NULL); | |
2420 | ||
2421 | if (!d_tracer && !once) { | |
2422 | once = 1; | |
2423 | pr_warning("Could not create debugfs directory 'tracing'\n"); | |
2424 | return NULL; | |
2425 | } | |
2426 | ||
2427 | return d_tracer; | |
2428 | } | |
2429 | ||
60a11774 SR |
2430 | #ifdef CONFIG_FTRACE_SELFTEST |
2431 | /* Let selftest have access to static functions in this file */ | |
2432 | #include "trace_selftest.c" | |
2433 | #endif | |
2434 | ||
bc0c38d1 SR |
2435 | static __init void tracer_init_debugfs(void) |
2436 | { | |
2437 | struct dentry *d_tracer; | |
2438 | struct dentry *entry; | |
2439 | ||
2440 | d_tracer = tracing_init_dentry(); | |
2441 | ||
2442 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, | |
2443 | &global_trace, &tracing_ctrl_fops); | |
2444 | if (!entry) | |
2445 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); | |
2446 | ||
2447 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, | |
2448 | NULL, &tracing_iter_fops); | |
2449 | if (!entry) | |
2450 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); | |
2451 | ||
c7078de1 IM |
2452 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
2453 | NULL, &tracing_cpumask_fops); | |
2454 | if (!entry) | |
2455 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); | |
2456 | ||
bc0c38d1 SR |
2457 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
2458 | &global_trace, &tracing_lt_fops); | |
2459 | if (!entry) | |
2460 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); | |
2461 | ||
2462 | entry = debugfs_create_file("trace", 0444, d_tracer, | |
2463 | &global_trace, &tracing_fops); | |
2464 | if (!entry) | |
2465 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2466 | ||
2467 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, | |
2468 | &global_trace, &show_traces_fops); | |
2469 | if (!entry) | |
2470 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2471 | ||
2472 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, | |
2473 | &global_trace, &set_tracer_fops); | |
2474 | if (!entry) | |
2475 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2476 | ||
2477 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, | |
2478 | &tracing_max_latency, | |
2479 | &tracing_max_lat_fops); | |
2480 | if (!entry) | |
2481 | pr_warning("Could not create debugfs " | |
2482 | "'tracing_max_latency' entry\n"); | |
2483 | ||
2484 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, | |
2485 | &tracing_thresh, &tracing_max_lat_fops); | |
2486 | if (!entry) | |
2487 | pr_warning("Could not create debugfs " | |
2488 | "'tracing_threash' entry\n"); | |
7bd2f24c IM |
2489 | entry = debugfs_create_file("README", 0644, d_tracer, |
2490 | NULL, &tracing_readme_fops); | |
2491 | if (!entry) | |
2492 | pr_warning("Could not create debugfs 'README' entry\n"); | |
2493 | ||
b3806b43 SR |
2494 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
2495 | NULL, &tracing_pipe_fops); | |
2496 | if (!entry) | |
2497 | pr_warning("Could not create debugfs " | |
2498 | "'tracing_threash' entry\n"); | |
bc0c38d1 SR |
2499 | |
2500 | #ifdef CONFIG_DYNAMIC_FTRACE | |
2501 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, | |
2502 | &ftrace_update_tot_cnt, | |
2503 | &tracing_read_long_fops); | |
2504 | if (!entry) | |
2505 | pr_warning("Could not create debugfs " | |
2506 | "'dyn_ftrace_total_info' entry\n"); | |
2507 | #endif | |
2508 | } | |
2509 | ||
2510 | /* dummy trace to disable tracing */ | |
2511 | static struct tracer no_tracer __read_mostly = | |
2512 | { | |
4bf39a94 | 2513 | .name = "none", |
bc0c38d1 SR |
2514 | }; |
2515 | ||
4c11d7ae | 2516 | static int trace_alloc_page(void) |
bc0c38d1 | 2517 | { |
4c11d7ae | 2518 | struct trace_array_cpu *data; |
4c11d7ae SR |
2519 | struct page *page, *tmp; |
2520 | LIST_HEAD(pages); | |
c7aafc54 | 2521 | void *array; |
4c11d7ae SR |
2522 | int i; |
2523 | ||
2524 | /* first allocate a page for each CPU */ | |
2525 | for_each_possible_cpu(i) { | |
2526 | array = (void *)__get_free_page(GFP_KERNEL); | |
2527 | if (array == NULL) { | |
2528 | printk(KERN_ERR "tracer: failed to allocate page" | |
2529 | "for trace buffer!\n"); | |
2530 | goto free_pages; | |
2531 | } | |
2532 | ||
2533 | page = virt_to_page(array); | |
2534 | list_add(&page->lru, &pages); | |
2535 | ||
2536 | /* Only allocate if we are actually using the max trace */ | |
2537 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2538 | array = (void *)__get_free_page(GFP_KERNEL); | |
2539 | if (array == NULL) { | |
2540 | printk(KERN_ERR "tracer: failed to allocate page" | |
2541 | "for trace buffer!\n"); | |
2542 | goto free_pages; | |
2543 | } | |
2544 | page = virt_to_page(array); | |
2545 | list_add(&page->lru, &pages); | |
2546 | #endif | |
2547 | } | |
2548 | ||
2549 | /* Now that we successfully allocate a page per CPU, add them */ | |
2550 | for_each_possible_cpu(i) { | |
2551 | data = global_trace.data[i]; | |
92205c23 | 2552 | data->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
4c11d7ae | 2553 | page = list_entry(pages.next, struct page, lru); |
c7aafc54 | 2554 | list_del_init(&page->lru); |
4c11d7ae SR |
2555 | list_add_tail(&page->lru, &data->trace_pages); |
2556 | ClearPageLRU(page); | |
2557 | ||
2558 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2559 | data = max_tr.data[i]; | |
92205c23 | 2560 | data->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
4c11d7ae | 2561 | page = list_entry(pages.next, struct page, lru); |
c7aafc54 | 2562 | list_del_init(&page->lru); |
4c11d7ae SR |
2563 | list_add_tail(&page->lru, &data->trace_pages); |
2564 | SetPageLRU(page); | |
2565 | #endif | |
2566 | } | |
2567 | global_trace.entries += ENTRIES_PER_PAGE; | |
2568 | ||
2569 | return 0; | |
2570 | ||
2571 | free_pages: | |
2572 | list_for_each_entry_safe(page, tmp, &pages, lru) { | |
c7aafc54 | 2573 | list_del_init(&page->lru); |
4c11d7ae SR |
2574 | __free_page(page); |
2575 | } | |
2576 | return -ENOMEM; | |
bc0c38d1 SR |
2577 | } |
2578 | ||
2579 | __init static int tracer_alloc_buffers(void) | |
2580 | { | |
4c11d7ae SR |
2581 | struct trace_array_cpu *data; |
2582 | void *array; | |
2583 | struct page *page; | |
2584 | int pages = 0; | |
60a11774 | 2585 | int ret = -ENOMEM; |
bc0c38d1 SR |
2586 | int i; |
2587 | ||
26994ead SR |
2588 | global_trace.ctrl = tracer_enabled; |
2589 | ||
4c11d7ae | 2590 | /* Allocate the first page for all buffers */ |
bc0c38d1 | 2591 | for_each_possible_cpu(i) { |
4c11d7ae | 2592 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
bc0c38d1 SR |
2593 | max_tr.data[i] = &per_cpu(max_data, i); |
2594 | ||
4c11d7ae | 2595 | array = (void *)__get_free_page(GFP_KERNEL); |
bc0c38d1 | 2596 | if (array == NULL) { |
4c11d7ae SR |
2597 | printk(KERN_ERR "tracer: failed to allocate page" |
2598 | "for trace buffer!\n"); | |
bc0c38d1 SR |
2599 | goto free_buffers; |
2600 | } | |
4c11d7ae SR |
2601 | |
2602 | /* set the array to the list */ | |
2603 | INIT_LIST_HEAD(&data->trace_pages); | |
2604 | page = virt_to_page(array); | |
2605 | list_add(&page->lru, &data->trace_pages); | |
2606 | /* use the LRU flag to differentiate the two buffers */ | |
2607 | ClearPageLRU(page); | |
bc0c38d1 SR |
2608 | |
2609 | /* Only allocate if we are actually using the max trace */ | |
2610 | #ifdef CONFIG_TRACER_MAX_TRACE | |
4c11d7ae | 2611 | array = (void *)__get_free_page(GFP_KERNEL); |
bc0c38d1 | 2612 | if (array == NULL) { |
4c11d7ae SR |
2613 | printk(KERN_ERR "tracer: failed to allocate page" |
2614 | "for trace buffer!\n"); | |
bc0c38d1 SR |
2615 | goto free_buffers; |
2616 | } | |
4c11d7ae SR |
2617 | |
2618 | INIT_LIST_HEAD(&max_tr.data[i]->trace_pages); | |
2619 | page = virt_to_page(array); | |
2620 | list_add(&page->lru, &max_tr.data[i]->trace_pages); | |
2621 | SetPageLRU(page); | |
bc0c38d1 SR |
2622 | #endif |
2623 | } | |
2624 | ||
2625 | /* | |
2626 | * Since we allocate by orders of pages, we may be able to | |
2627 | * round up a bit. | |
2628 | */ | |
4c11d7ae | 2629 | global_trace.entries = ENTRIES_PER_PAGE; |
4c11d7ae SR |
2630 | pages++; |
2631 | ||
2632 | while (global_trace.entries < trace_nr_entries) { | |
2633 | if (trace_alloc_page()) | |
2634 | break; | |
2635 | pages++; | |
2636 | } | |
89b2f978 | 2637 | max_tr.entries = global_trace.entries; |
bc0c38d1 | 2638 | |
4c11d7ae SR |
2639 | pr_info("tracer: %d pages allocated for %ld", |
2640 | pages, trace_nr_entries); | |
bc0c38d1 SR |
2641 | pr_info(" entries of %ld bytes\n", (long)TRACE_ENTRY_SIZE); |
2642 | pr_info(" actual entries %ld\n", global_trace.entries); | |
2643 | ||
2644 | tracer_init_debugfs(); | |
2645 | ||
2646 | trace_init_cmdlines(); | |
2647 | ||
2648 | register_tracer(&no_tracer); | |
2649 | current_trace = &no_tracer; | |
2650 | ||
60a11774 SR |
2651 | /* All seems OK, enable tracing */ |
2652 | tracing_disabled = 0; | |
2653 | ||
bc0c38d1 SR |
2654 | return 0; |
2655 | ||
2656 | free_buffers: | |
2657 | for (i-- ; i >= 0; i--) { | |
4c11d7ae | 2658 | struct page *page, *tmp; |
bc0c38d1 SR |
2659 | struct trace_array_cpu *data = global_trace.data[i]; |
2660 | ||
c7aafc54 | 2661 | if (data) { |
4c11d7ae SR |
2662 | list_for_each_entry_safe(page, tmp, |
2663 | &data->trace_pages, lru) { | |
c7aafc54 | 2664 | list_del_init(&page->lru); |
4c11d7ae SR |
2665 | __free_page(page); |
2666 | } | |
bc0c38d1 SR |
2667 | } |
2668 | ||
2669 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2670 | data = max_tr.data[i]; | |
c7aafc54 | 2671 | if (data) { |
4c11d7ae SR |
2672 | list_for_each_entry_safe(page, tmp, |
2673 | &data->trace_pages, lru) { | |
c7aafc54 | 2674 | list_del_init(&page->lru); |
4c11d7ae SR |
2675 | __free_page(page); |
2676 | } | |
bc0c38d1 SR |
2677 | } |
2678 | #endif | |
2679 | } | |
60a11774 | 2680 | return ret; |
bc0c38d1 | 2681 | } |
60a11774 | 2682 | fs_initcall(tracer_alloc_buffers); |