Commit | Line | Data |
---|---|---|
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); | |
2a2cc8f7 | 69 | static DECLARE_WAIT_QUEUE_HEAD (trace_wait); |
bc0c38d1 | 70 | |
4c11d7ae SR |
71 | #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(struct trace_entry)) |
72 | ||
bc0c38d1 SR |
73 | static int __init set_nr_entries(char *str) |
74 | { | |
75 | if (!str) | |
76 | return 0; | |
77 | trace_nr_entries = simple_strtoul(str, &str, 0); | |
78 | return 1; | |
79 | } | |
80 | __setup("trace_entries=", set_nr_entries); | |
81 | ||
57f50be1 SR |
82 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
83 | { | |
84 | return nsecs / 1000; | |
85 | } | |
86 | ||
bc0c38d1 SR |
87 | enum trace_type { |
88 | __TRACE_FIRST_TYPE = 0, | |
89 | ||
90 | TRACE_FN, | |
91 | TRACE_CTX, | |
57422797 | 92 | TRACE_WAKE, |
86387f7e | 93 | TRACE_STACK, |
f0a920d5 | 94 | TRACE_SPECIAL, |
bc0c38d1 SR |
95 | |
96 | __TRACE_LAST_TYPE | |
97 | }; | |
98 | ||
99 | enum trace_flag_type { | |
100 | TRACE_FLAG_IRQS_OFF = 0x01, | |
101 | TRACE_FLAG_NEED_RESCHED = 0x02, | |
102 | TRACE_FLAG_HARDIRQ = 0x04, | |
103 | TRACE_FLAG_SOFTIRQ = 0x08, | |
104 | }; | |
105 | ||
106 | enum trace_iterator_flags { | |
107 | TRACE_ITER_PRINT_PARENT = 0x01, | |
108 | TRACE_ITER_SYM_OFFSET = 0x02, | |
109 | TRACE_ITER_SYM_ADDR = 0x04, | |
110 | TRACE_ITER_VERBOSE = 0x08, | |
f9896bf3 | 111 | TRACE_ITER_RAW = 0x10, |
5e3ca0ec IM |
112 | TRACE_ITER_HEX = 0x20, |
113 | TRACE_ITER_BIN = 0x40, | |
2a2cc8f7 | 114 | TRACE_ITER_BLOCK = 0x80, |
86387f7e | 115 | TRACE_ITER_STACKTRACE = 0x100, |
bc0c38d1 SR |
116 | }; |
117 | ||
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", |
bc0c38d1 SR |
132 | NULL |
133 | }; | |
134 | ||
86387f7e | 135 | static unsigned trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_STACKTRACE; |
bc0c38d1 | 136 | |
4c11d7ae | 137 | static DEFINE_SPINLOCK(ftrace_max_lock); |
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 SR |
338 | WARN_ON_ONCE(!irqs_disabled()); |
339 | 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); | |
4c11d7ae | 348 | 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 SR |
363 | WARN_ON_ONCE(!irqs_disabled()); |
364 | 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); | |
4c11d7ae | 372 | 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 | |
dcb6308f | 656 | spin_lock_irqsave(&data->lock, irq_flags); |
c7aafc54 | 657 | entry = tracing_get_trace_entry(tr, data); |
bc0c38d1 | 658 | tracing_generic_entry_update(entry, flags); |
c7aafc54 IM |
659 | entry->type = TRACE_FN; |
660 | entry->fn.ip = ip; | |
661 | entry->fn.parent_ip = parent_ip; | |
dcb6308f | 662 | spin_unlock_irqrestore(&data->lock, irq_flags); |
2a2cc8f7 SSP |
663 | |
664 | if (!(trace_flags & TRACE_ITER_BLOCK)) | |
86387f7e | 665 | wake_up(&trace_wait); |
bc0c38d1 SR |
666 | } |
667 | ||
e309b41d | 668 | void |
2e0f5761 IM |
669 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
670 | unsigned long ip, unsigned long parent_ip, unsigned long flags) | |
671 | { | |
672 | if (likely(!atomic_read(&data->disabled))) | |
6fb44b71 | 673 | trace_function(tr, data, ip, parent_ip, flags); |
2e0f5761 IM |
674 | } |
675 | ||
e309b41d | 676 | void |
f0a920d5 IM |
677 | trace_special(struct trace_array *tr, struct trace_array_cpu *data, |
678 | unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
679 | { | |
680 | struct trace_entry *entry; | |
dcb6308f | 681 | unsigned long irq_flags; |
f0a920d5 | 682 | |
dcb6308f | 683 | spin_lock_irqsave(&data->lock, irq_flags); |
f0a920d5 IM |
684 | entry = tracing_get_trace_entry(tr, data); |
685 | tracing_generic_entry_update(entry, 0); | |
686 | entry->type = TRACE_SPECIAL; | |
687 | entry->special.arg1 = arg1; | |
688 | entry->special.arg2 = arg2; | |
689 | entry->special.arg3 = arg3; | |
dcb6308f | 690 | spin_unlock_irqrestore(&data->lock, irq_flags); |
2a2cc8f7 SSP |
691 | |
692 | if (!(trace_flags & TRACE_ITER_BLOCK)) | |
86387f7e IM |
693 | wake_up(&trace_wait); |
694 | } | |
695 | ||
696 | void __trace_stack(struct trace_array *tr, | |
697 | struct trace_array_cpu *data, | |
698 | unsigned long flags, | |
699 | int skip) | |
700 | { | |
701 | struct trace_entry *entry; | |
702 | struct stack_trace trace; | |
703 | ||
704 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) | |
705 | return; | |
706 | ||
707 | entry = tracing_get_trace_entry(tr, data); | |
708 | tracing_generic_entry_update(entry, flags); | |
709 | entry->type = TRACE_STACK; | |
710 | ||
711 | memset(&entry->stack, 0, sizeof(entry->stack)); | |
712 | ||
713 | trace.nr_entries = 0; | |
714 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
715 | trace.skip = skip; | |
716 | trace.entries = entry->stack.caller; | |
717 | ||
718 | save_stack_trace(&trace); | |
f0a920d5 IM |
719 | } |
720 | ||
e309b41d | 721 | void |
bc0c38d1 SR |
722 | tracing_sched_switch_trace(struct trace_array *tr, |
723 | struct trace_array_cpu *data, | |
86387f7e IM |
724 | struct task_struct *prev, |
725 | struct task_struct *next, | |
bc0c38d1 SR |
726 | unsigned long flags) |
727 | { | |
728 | struct trace_entry *entry; | |
dcb6308f | 729 | unsigned long irq_flags; |
bc0c38d1 | 730 | |
dcb6308f | 731 | spin_lock_irqsave(&data->lock, irq_flags); |
c7aafc54 | 732 | entry = tracing_get_trace_entry(tr, data); |
bc0c38d1 SR |
733 | tracing_generic_entry_update(entry, flags); |
734 | entry->type = TRACE_CTX; | |
735 | entry->ctx.prev_pid = prev->pid; | |
736 | entry->ctx.prev_prio = prev->prio; | |
737 | entry->ctx.prev_state = prev->state; | |
738 | entry->ctx.next_pid = next->pid; | |
739 | entry->ctx.next_prio = next->prio; | |
86387f7e | 740 | __trace_stack(tr, data, flags, 4); |
dcb6308f | 741 | spin_unlock_irqrestore(&data->lock, irq_flags); |
2a2cc8f7 SSP |
742 | |
743 | if (!(trace_flags & TRACE_ITER_BLOCK)) | |
86387f7e | 744 | wake_up(&trace_wait); |
bc0c38d1 SR |
745 | } |
746 | ||
57422797 IM |
747 | void |
748 | tracing_sched_wakeup_trace(struct trace_array *tr, | |
749 | struct trace_array_cpu *data, | |
86387f7e IM |
750 | struct task_struct *wakee, |
751 | struct task_struct *curr, | |
57422797 IM |
752 | unsigned long flags) |
753 | { | |
754 | struct trace_entry *entry; | |
755 | unsigned long irq_flags; | |
756 | ||
757 | spin_lock_irqsave(&data->lock, irq_flags); | |
758 | entry = tracing_get_trace_entry(tr, data); | |
759 | tracing_generic_entry_update(entry, flags); | |
760 | entry->type = TRACE_WAKE; | |
761 | entry->ctx.prev_pid = curr->pid; | |
762 | entry->ctx.prev_prio = curr->prio; | |
763 | entry->ctx.prev_state = curr->state; | |
764 | entry->ctx.next_pid = wakee->pid; | |
765 | entry->ctx.next_prio = wakee->prio; | |
86387f7e | 766 | __trace_stack(tr, data, flags, 5); |
57422797 IM |
767 | spin_unlock_irqrestore(&data->lock, irq_flags); |
768 | ||
769 | if (!(trace_flags & TRACE_ITER_BLOCK)) | |
770 | wake_up(&trace_wait); | |
771 | } | |
772 | ||
2e0f5761 | 773 | #ifdef CONFIG_FTRACE |
e309b41d | 774 | static void |
2e0f5761 IM |
775 | function_trace_call(unsigned long ip, unsigned long parent_ip) |
776 | { | |
777 | struct trace_array *tr = &global_trace; | |
778 | struct trace_array_cpu *data; | |
779 | unsigned long flags; | |
780 | long disabled; | |
781 | int cpu; | |
782 | ||
783 | if (unlikely(!tracer_enabled)) | |
784 | return; | |
785 | ||
786 | local_irq_save(flags); | |
787 | cpu = raw_smp_processor_id(); | |
788 | data = tr->data[cpu]; | |
789 | disabled = atomic_inc_return(&data->disabled); | |
790 | ||
791 | if (likely(disabled == 1)) | |
6fb44b71 | 792 | trace_function(tr, data, ip, parent_ip, flags); |
2e0f5761 IM |
793 | |
794 | atomic_dec(&data->disabled); | |
795 | local_irq_restore(flags); | |
796 | } | |
797 | ||
798 | static struct ftrace_ops trace_ops __read_mostly = | |
799 | { | |
800 | .func = function_trace_call, | |
801 | }; | |
802 | ||
e309b41d | 803 | void tracing_start_function_trace(void) |
2e0f5761 IM |
804 | { |
805 | register_ftrace_function(&trace_ops); | |
806 | } | |
807 | ||
e309b41d | 808 | void tracing_stop_function_trace(void) |
2e0f5761 IM |
809 | { |
810 | unregister_ftrace_function(&trace_ops); | |
811 | } | |
812 | #endif | |
813 | ||
bc0c38d1 SR |
814 | enum trace_file_type { |
815 | TRACE_FILE_LAT_FMT = 1, | |
816 | }; | |
817 | ||
818 | static struct trace_entry * | |
4c11d7ae SR |
819 | trace_entry_idx(struct trace_array *tr, struct trace_array_cpu *data, |
820 | struct trace_iterator *iter, int cpu) | |
bc0c38d1 | 821 | { |
4c11d7ae SR |
822 | struct page *page; |
823 | struct trace_entry *array; | |
bc0c38d1 | 824 | |
4c11d7ae | 825 | if (iter->next_idx[cpu] >= tr->entries || |
b3806b43 SR |
826 | iter->next_idx[cpu] >= data->trace_idx || |
827 | (data->trace_head == data->trace_tail && | |
828 | data->trace_head_idx == data->trace_tail_idx)) | |
bc0c38d1 SR |
829 | return NULL; |
830 | ||
4c11d7ae | 831 | if (!iter->next_page[cpu]) { |
93a588f4 SR |
832 | /* Initialize the iterator for this cpu trace buffer */ |
833 | WARN_ON(!data->trace_tail); | |
834 | page = virt_to_page(data->trace_tail); | |
835 | iter->next_page[cpu] = &page->lru; | |
836 | iter->next_page_idx[cpu] = data->trace_tail_idx; | |
4c11d7ae | 837 | } |
bc0c38d1 | 838 | |
4c11d7ae | 839 | page = list_entry(iter->next_page[cpu], struct page, lru); |
c7aafc54 IM |
840 | BUG_ON(&data->trace_pages == &page->lru); |
841 | ||
4c11d7ae SR |
842 | array = page_address(page); |
843 | ||
93a588f4 | 844 | WARN_ON(iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE); |
4c11d7ae | 845 | return &array[iter->next_page_idx[cpu]]; |
bc0c38d1 SR |
846 | } |
847 | ||
e309b41d | 848 | static struct trace_entry * |
bc0c38d1 SR |
849 | find_next_entry(struct trace_iterator *iter, int *ent_cpu) |
850 | { | |
851 | struct trace_array *tr = iter->tr; | |
852 | struct trace_entry *ent, *next = NULL; | |
853 | int next_cpu = -1; | |
854 | int cpu; | |
855 | ||
856 | for_each_possible_cpu(cpu) { | |
c7aafc54 | 857 | if (!head_page(tr->data[cpu])) |
bc0c38d1 | 858 | continue; |
4c11d7ae | 859 | ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); |
cdd31cd2 IM |
860 | /* |
861 | * Pick the entry with the smallest timestamp: | |
862 | */ | |
863 | if (ent && (!next || ent->t < next->t)) { | |
bc0c38d1 SR |
864 | next = ent; |
865 | next_cpu = cpu; | |
866 | } | |
867 | } | |
868 | ||
869 | if (ent_cpu) | |
870 | *ent_cpu = next_cpu; | |
871 | ||
872 | return next; | |
873 | } | |
874 | ||
e309b41d | 875 | static void trace_iterator_increment(struct trace_iterator *iter) |
bc0c38d1 | 876 | { |
b3806b43 SR |
877 | iter->idx++; |
878 | iter->next_idx[iter->cpu]++; | |
879 | iter->next_page_idx[iter->cpu]++; | |
8c523a9d | 880 | |
b3806b43 SR |
881 | if (iter->next_page_idx[iter->cpu] >= ENTRIES_PER_PAGE) { |
882 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; | |
bc0c38d1 | 883 | |
b3806b43 SR |
884 | iter->next_page_idx[iter->cpu] = 0; |
885 | iter->next_page[iter->cpu] = | |
886 | trace_next_list(data, iter->next_page[iter->cpu]); | |
887 | } | |
888 | } | |
bc0c38d1 | 889 | |
e309b41d | 890 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 SR |
891 | { |
892 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; | |
893 | ||
894 | data->trace_tail_idx++; | |
895 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { | |
896 | data->trace_tail = trace_next_page(data, data->trace_tail); | |
897 | data->trace_tail_idx = 0; | |
898 | } | |
4e3c3333 | 899 | |
b3806b43 SR |
900 | /* Check if we empty it, then reset the index */ |
901 | if (data->trace_head == data->trace_tail && | |
902 | data->trace_head_idx == data->trace_tail_idx) | |
903 | data->trace_idx = 0; | |
b3806b43 SR |
904 | } |
905 | ||
e309b41d | 906 | static void *find_next_entry_inc(struct trace_iterator *iter) |
b3806b43 SR |
907 | { |
908 | struct trace_entry *next; | |
909 | int next_cpu = -1; | |
910 | ||
911 | next = find_next_entry(iter, &next_cpu); | |
93a588f4 | 912 | |
4e3c3333 IM |
913 | iter->prev_ent = iter->ent; |
914 | iter->prev_cpu = iter->cpu; | |
915 | ||
bc0c38d1 SR |
916 | iter->ent = next; |
917 | iter->cpu = next_cpu; | |
918 | ||
b3806b43 SR |
919 | if (next) |
920 | trace_iterator_increment(iter); | |
921 | ||
bc0c38d1 SR |
922 | return next ? iter : NULL; |
923 | } | |
924 | ||
e309b41d | 925 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
926 | { |
927 | struct trace_iterator *iter = m->private; | |
bc0c38d1 SR |
928 | void *last_ent = iter->ent; |
929 | int i = (int)*pos; | |
4e3c3333 | 930 | void *ent; |
bc0c38d1 SR |
931 | |
932 | (*pos)++; | |
933 | ||
934 | /* can't go backwards */ | |
935 | if (iter->idx > i) | |
936 | return NULL; | |
937 | ||
938 | if (iter->idx < 0) | |
939 | ent = find_next_entry_inc(iter); | |
940 | else | |
941 | ent = iter; | |
942 | ||
943 | while (ent && iter->idx < i) | |
944 | ent = find_next_entry_inc(iter); | |
945 | ||
946 | iter->pos = *pos; | |
947 | ||
948 | if (last_ent && !ent) | |
949 | seq_puts(m, "\n\nvim:ft=help\n"); | |
950 | ||
951 | return ent; | |
952 | } | |
953 | ||
954 | static void *s_start(struct seq_file *m, loff_t *pos) | |
955 | { | |
956 | struct trace_iterator *iter = m->private; | |
957 | void *p = NULL; | |
958 | loff_t l = 0; | |
959 | int i; | |
960 | ||
961 | mutex_lock(&trace_types_lock); | |
962 | ||
963 | if (!current_trace || current_trace != iter->trace) | |
964 | return NULL; | |
965 | ||
966 | atomic_inc(&trace_record_cmdline_disabled); | |
967 | ||
968 | /* let the tracer grab locks here if needed */ | |
969 | if (current_trace->start) | |
970 | current_trace->start(iter); | |
971 | ||
972 | if (*pos != iter->pos) { | |
973 | iter->ent = NULL; | |
974 | iter->cpu = 0; | |
975 | iter->idx = -1; | |
4e3c3333 IM |
976 | iter->prev_ent = NULL; |
977 | iter->prev_cpu = -1; | |
bc0c38d1 | 978 | |
4c11d7ae | 979 | for_each_possible_cpu(i) { |
bc0c38d1 | 980 | iter->next_idx[i] = 0; |
4c11d7ae SR |
981 | iter->next_page[i] = NULL; |
982 | } | |
bc0c38d1 SR |
983 | |
984 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) | |
985 | ; | |
986 | ||
987 | } else { | |
4c11d7ae | 988 | l = *pos - 1; |
bc0c38d1 SR |
989 | p = s_next(m, p, &l); |
990 | } | |
991 | ||
992 | return p; | |
993 | } | |
994 | ||
995 | static void s_stop(struct seq_file *m, void *p) | |
996 | { | |
997 | struct trace_iterator *iter = m->private; | |
998 | ||
999 | atomic_dec(&trace_record_cmdline_disabled); | |
1000 | ||
1001 | /* let the tracer release locks here if needed */ | |
1002 | if (current_trace && current_trace == iter->trace && iter->trace->stop) | |
1003 | iter->trace->stop(iter); | |
1004 | ||
1005 | mutex_unlock(&trace_types_lock); | |
1006 | } | |
1007 | ||
b3806b43 | 1008 | static int |
214023c3 | 1009 | seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) |
bc0c38d1 SR |
1010 | { |
1011 | #ifdef CONFIG_KALLSYMS | |
1012 | char str[KSYM_SYMBOL_LEN]; | |
1013 | ||
1014 | kallsyms_lookup(address, NULL, NULL, NULL, str); | |
1015 | ||
b3806b43 | 1016 | return trace_seq_printf(s, fmt, str); |
bc0c38d1 | 1017 | #endif |
b3806b43 | 1018 | return 1; |
bc0c38d1 SR |
1019 | } |
1020 | ||
b3806b43 | 1021 | static int |
214023c3 SR |
1022 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
1023 | unsigned long address) | |
bc0c38d1 SR |
1024 | { |
1025 | #ifdef CONFIG_KALLSYMS | |
1026 | char str[KSYM_SYMBOL_LEN]; | |
1027 | ||
1028 | sprint_symbol(str, address); | |
b3806b43 | 1029 | return trace_seq_printf(s, fmt, str); |
bc0c38d1 | 1030 | #endif |
b3806b43 | 1031 | return 1; |
bc0c38d1 SR |
1032 | } |
1033 | ||
1034 | #ifndef CONFIG_64BIT | |
1035 | # define IP_FMT "%08lx" | |
1036 | #else | |
1037 | # define IP_FMT "%016lx" | |
1038 | #endif | |
1039 | ||
e309b41d | 1040 | static int |
214023c3 | 1041 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) |
bc0c38d1 | 1042 | { |
b3806b43 SR |
1043 | int ret; |
1044 | ||
1045 | if (!ip) | |
1046 | return trace_seq_printf(s, "0"); | |
bc0c38d1 SR |
1047 | |
1048 | if (sym_flags & TRACE_ITER_SYM_OFFSET) | |
b3806b43 | 1049 | ret = seq_print_sym_offset(s, "%s", ip); |
bc0c38d1 | 1050 | else |
b3806b43 SR |
1051 | ret = seq_print_sym_short(s, "%s", ip); |
1052 | ||
1053 | if (!ret) | |
1054 | return 0; | |
bc0c38d1 SR |
1055 | |
1056 | if (sym_flags & TRACE_ITER_SYM_ADDR) | |
b3806b43 SR |
1057 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
1058 | return ret; | |
bc0c38d1 SR |
1059 | } |
1060 | ||
e309b41d | 1061 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 SR |
1062 | { |
1063 | seq_puts(m, "# _------=> CPU# \n"); | |
1064 | seq_puts(m, "# / _-----=> irqs-off \n"); | |
1065 | seq_puts(m, "# | / _----=> need-resched \n"); | |
1066 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); | |
1067 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); | |
1068 | seq_puts(m, "# |||| / \n"); | |
1069 | seq_puts(m, "# ||||| delay \n"); | |
1070 | seq_puts(m, "# cmd pid ||||| time | caller \n"); | |
1071 | seq_puts(m, "# \\ / ||||| \\ | / \n"); | |
1072 | } | |
1073 | ||
e309b41d | 1074 | static void print_func_help_header(struct seq_file *m) |
bc0c38d1 SR |
1075 | { |
1076 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); | |
1077 | seq_puts(m, "# | | | | |\n"); | |
1078 | } | |
1079 | ||
1080 | ||
e309b41d | 1081 | static void |
bc0c38d1 SR |
1082 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
1083 | { | |
1084 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); | |
1085 | struct trace_array *tr = iter->tr; | |
1086 | struct trace_array_cpu *data = tr->data[tr->cpu]; | |
1087 | struct tracer *type = current_trace; | |
4c11d7ae SR |
1088 | unsigned long total = 0; |
1089 | unsigned long entries = 0; | |
bc0c38d1 SR |
1090 | int cpu; |
1091 | const char *name = "preemption"; | |
1092 | ||
1093 | if (type) | |
1094 | name = type->name; | |
1095 | ||
1096 | for_each_possible_cpu(cpu) { | |
c7aafc54 | 1097 | if (head_page(tr->data[cpu])) { |
4c11d7ae SR |
1098 | total += tr->data[cpu]->trace_idx; |
1099 | if (tr->data[cpu]->trace_idx > tr->entries) | |
bc0c38d1 | 1100 | entries += tr->entries; |
4c11d7ae | 1101 | else |
bc0c38d1 SR |
1102 | entries += tr->data[cpu]->trace_idx; |
1103 | } | |
1104 | } | |
1105 | ||
1106 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", | |
1107 | name, UTS_RELEASE); | |
1108 | seq_puts(m, "-----------------------------------" | |
1109 | "---------------------------------\n"); | |
1110 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" | |
1111 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", | |
57f50be1 | 1112 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 1113 | entries, |
4c11d7ae | 1114 | total, |
bc0c38d1 SR |
1115 | tr->cpu, |
1116 | #if defined(CONFIG_PREEMPT_NONE) | |
1117 | "server", | |
1118 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
1119 | "desktop", | |
1120 | #elif defined(CONFIG_PREEMPT_DESKTOP) | |
1121 | "preempt", | |
1122 | #else | |
1123 | "unknown", | |
1124 | #endif | |
1125 | /* These are reserved for later use */ | |
1126 | 0, 0, 0, 0); | |
1127 | #ifdef CONFIG_SMP | |
1128 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
1129 | #else | |
1130 | seq_puts(m, ")\n"); | |
1131 | #endif | |
1132 | seq_puts(m, " -----------------\n"); | |
1133 | seq_printf(m, " | task: %.16s-%d " | |
1134 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", | |
1135 | data->comm, data->pid, data->uid, data->nice, | |
1136 | data->policy, data->rt_priority); | |
1137 | seq_puts(m, " -----------------\n"); | |
1138 | ||
1139 | if (data->critical_start) { | |
1140 | seq_puts(m, " => started at: "); | |
214023c3 SR |
1141 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
1142 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 | 1143 | seq_puts(m, "\n => ended at: "); |
214023c3 SR |
1144 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
1145 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 SR |
1146 | seq_puts(m, "\n"); |
1147 | } | |
1148 | ||
1149 | seq_puts(m, "\n"); | |
1150 | } | |
1151 | ||
e309b41d | 1152 | static void |
214023c3 | 1153 | lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) |
bc0c38d1 SR |
1154 | { |
1155 | int hardirq, softirq; | |
1156 | char *comm; | |
1157 | ||
1158 | comm = trace_find_cmdline(entry->pid); | |
1159 | ||
214023c3 SR |
1160 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
1161 | trace_seq_printf(s, "%d", cpu); | |
1162 | trace_seq_printf(s, "%c%c", | |
1163 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.', | |
1164 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); | |
bc0c38d1 SR |
1165 | |
1166 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; | |
1167 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; | |
1168 | if (hardirq && softirq) | |
214023c3 | 1169 | trace_seq_putc(s, 'H'); |
bc0c38d1 SR |
1170 | else { |
1171 | if (hardirq) | |
214023c3 | 1172 | trace_seq_putc(s, 'h'); |
bc0c38d1 SR |
1173 | else { |
1174 | if (softirq) | |
214023c3 | 1175 | trace_seq_putc(s, 's'); |
bc0c38d1 | 1176 | else |
214023c3 | 1177 | trace_seq_putc(s, '.'); |
bc0c38d1 SR |
1178 | } |
1179 | } | |
1180 | ||
1181 | if (entry->preempt_count) | |
214023c3 | 1182 | trace_seq_printf(s, "%x", entry->preempt_count); |
bc0c38d1 | 1183 | else |
214023c3 | 1184 | trace_seq_puts(s, "."); |
bc0c38d1 SR |
1185 | } |
1186 | ||
1187 | unsigned long preempt_mark_thresh = 100; | |
1188 | ||
e309b41d | 1189 | static void |
214023c3 | 1190 | lat_print_timestamp(struct trace_seq *s, unsigned long long abs_usecs, |
bc0c38d1 SR |
1191 | unsigned long rel_usecs) |
1192 | { | |
214023c3 | 1193 | trace_seq_printf(s, " %4lldus", abs_usecs); |
bc0c38d1 | 1194 | if (rel_usecs > preempt_mark_thresh) |
214023c3 | 1195 | trace_seq_puts(s, "!: "); |
bc0c38d1 | 1196 | else if (rel_usecs > 1) |
214023c3 | 1197 | trace_seq_puts(s, "+: "); |
bc0c38d1 | 1198 | else |
214023c3 | 1199 | trace_seq_puts(s, " : "); |
bc0c38d1 SR |
1200 | } |
1201 | ||
1202 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; | |
1203 | ||
e309b41d | 1204 | static int |
214023c3 | 1205 | print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) |
bc0c38d1 | 1206 | { |
214023c3 | 1207 | struct trace_seq *s = &iter->seq; |
bc0c38d1 SR |
1208 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
1209 | struct trace_entry *next_entry = find_next_entry(iter, NULL); | |
1210 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); | |
1211 | struct trace_entry *entry = iter->ent; | |
1212 | unsigned long abs_usecs; | |
1213 | unsigned long rel_usecs; | |
1214 | char *comm; | |
1215 | int S; | |
86387f7e | 1216 | int i; |
bc0c38d1 SR |
1217 | |
1218 | if (!next_entry) | |
1219 | next_entry = entry; | |
1220 | rel_usecs = ns2usecs(next_entry->t - entry->t); | |
1221 | abs_usecs = ns2usecs(entry->t - iter->tr->time_start); | |
1222 | ||
1223 | if (verbose) { | |
1224 | comm = trace_find_cmdline(entry->pid); | |
214023c3 SR |
1225 | trace_seq_printf(s, "%16s %5d %d %d %08x %08x [%08lx]" |
1226 | " %ld.%03ldms (+%ld.%03ldms): ", | |
1227 | comm, | |
1228 | entry->pid, cpu, entry->flags, | |
1229 | entry->preempt_count, trace_idx, | |
1230 | ns2usecs(entry->t), | |
1231 | abs_usecs/1000, | |
1232 | abs_usecs % 1000, rel_usecs/1000, | |
1233 | rel_usecs % 1000); | |
bc0c38d1 | 1234 | } else { |
86387f7e IM |
1235 | if (entry->type != TRACE_STACK) { |
1236 | lat_print_generic(s, entry, cpu); | |
1237 | lat_print_timestamp(s, abs_usecs, rel_usecs); | |
1238 | } | |
bc0c38d1 SR |
1239 | } |
1240 | switch (entry->type) { | |
1241 | case TRACE_FN: | |
214023c3 SR |
1242 | seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
1243 | trace_seq_puts(s, " ("); | |
1244 | seq_print_ip_sym(s, entry->fn.parent_ip, sym_flags); | |
1245 | trace_seq_puts(s, ")\n"); | |
bc0c38d1 SR |
1246 | break; |
1247 | case TRACE_CTX: | |
57422797 | 1248 | case TRACE_WAKE: |
bc0c38d1 SR |
1249 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
1250 | state_to_char[entry->ctx.prev_state] : 'X'; | |
1251 | comm = trace_find_cmdline(entry->ctx.next_pid); | |
57422797 | 1252 | trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d %s\n", |
214023c3 SR |
1253 | entry->ctx.prev_pid, |
1254 | entry->ctx.prev_prio, | |
57422797 | 1255 | S, entry->type == TRACE_CTX ? "==>" : " +", |
214023c3 SR |
1256 | entry->ctx.next_pid, |
1257 | entry->ctx.next_prio, | |
1258 | comm); | |
bc0c38d1 | 1259 | break; |
f0a920d5 IM |
1260 | case TRACE_SPECIAL: |
1261 | trace_seq_printf(s, " %lx %lx %lx\n", | |
1262 | entry->special.arg1, | |
1263 | entry->special.arg2, | |
1264 | entry->special.arg3); | |
1265 | break; | |
86387f7e IM |
1266 | case TRACE_STACK: |
1267 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { | |
1268 | if (i) | |
1269 | trace_seq_puts(s, " <= "); | |
1270 | seq_print_ip_sym(s, entry->stack.caller[i], sym_flags); | |
1271 | } | |
1272 | trace_seq_puts(s, "\n"); | |
1273 | break; | |
89b2f978 | 1274 | default: |
214023c3 | 1275 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
bc0c38d1 | 1276 | } |
f9896bf3 | 1277 | return 1; |
bc0c38d1 SR |
1278 | } |
1279 | ||
e309b41d | 1280 | static int print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 1281 | { |
214023c3 | 1282 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1283 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 1284 | struct trace_entry *entry; |
bc0c38d1 SR |
1285 | unsigned long usec_rem; |
1286 | unsigned long long t; | |
1287 | unsigned long secs; | |
1288 | char *comm; | |
b3806b43 | 1289 | int ret; |
86387f7e IM |
1290 | int S; |
1291 | int i; | |
bc0c38d1 | 1292 | |
4e3c3333 IM |
1293 | entry = iter->ent; |
1294 | ||
bc0c38d1 SR |
1295 | comm = trace_find_cmdline(iter->ent->pid); |
1296 | ||
cdd31cd2 | 1297 | t = ns2usecs(entry->t); |
bc0c38d1 SR |
1298 | usec_rem = do_div(t, 1000000ULL); |
1299 | secs = (unsigned long)t; | |
1300 | ||
86387f7e IM |
1301 | if (entry->type != TRACE_STACK) { |
1302 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); | |
1303 | if (!ret) | |
1304 | return 0; | |
1305 | ret = trace_seq_printf(s, "[%02d] ", iter->cpu); | |
1306 | if (!ret) | |
1307 | return 0; | |
1308 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); | |
1309 | if (!ret) | |
1310 | return 0; | |
1311 | } | |
bc0c38d1 SR |
1312 | |
1313 | switch (entry->type) { | |
1314 | case TRACE_FN: | |
b3806b43 SR |
1315 | ret = seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
1316 | if (!ret) | |
1317 | return 0; | |
bc0c38d1 SR |
1318 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
1319 | entry->fn.parent_ip) { | |
b3806b43 SR |
1320 | ret = trace_seq_printf(s, " <-"); |
1321 | if (!ret) | |
1322 | return 0; | |
1323 | ret = seq_print_ip_sym(s, entry->fn.parent_ip, | |
1324 | sym_flags); | |
1325 | if (!ret) | |
1326 | return 0; | |
bc0c38d1 | 1327 | } |
b3806b43 SR |
1328 | ret = trace_seq_printf(s, "\n"); |
1329 | if (!ret) | |
1330 | return 0; | |
bc0c38d1 SR |
1331 | break; |
1332 | case TRACE_CTX: | |
57422797 | 1333 | case TRACE_WAKE: |
bc0c38d1 SR |
1334 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
1335 | state_to_char[entry->ctx.prev_state] : 'X'; | |
57422797 | 1336 | ret = trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d\n", |
b3806b43 SR |
1337 | entry->ctx.prev_pid, |
1338 | entry->ctx.prev_prio, | |
1339 | S, | |
57422797 | 1340 | entry->type == TRACE_CTX ? "==>" : " +", |
b3806b43 SR |
1341 | entry->ctx.next_pid, |
1342 | entry->ctx.next_prio); | |
1343 | if (!ret) | |
1344 | return 0; | |
bc0c38d1 | 1345 | break; |
f0a920d5 IM |
1346 | case TRACE_SPECIAL: |
1347 | ret = trace_seq_printf(s, " %lx %lx %lx\n", | |
1348 | entry->special.arg1, | |
1349 | entry->special.arg2, | |
1350 | entry->special.arg3); | |
1351 | if (!ret) | |
1352 | return 0; | |
1353 | break; | |
86387f7e IM |
1354 | case TRACE_STACK: |
1355 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { | |
1356 | if (i) { | |
1357 | ret = trace_seq_puts(s, " <= "); | |
1358 | if (!ret) | |
1359 | return 0; | |
1360 | } | |
1361 | ret = seq_print_ip_sym(s, entry->stack.caller[i], | |
1362 | sym_flags); | |
1363 | if (!ret) | |
1364 | return 0; | |
1365 | } | |
1366 | ret = trace_seq_puts(s, "\n"); | |
1367 | if (!ret) | |
1368 | return 0; | |
1369 | break; | |
bc0c38d1 | 1370 | } |
b3806b43 | 1371 | return 1; |
bc0c38d1 SR |
1372 | } |
1373 | ||
e309b41d | 1374 | static int print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 IM |
1375 | { |
1376 | struct trace_seq *s = &iter->seq; | |
1377 | struct trace_entry *entry; | |
1378 | int ret; | |
1379 | int S; | |
1380 | ||
1381 | entry = iter->ent; | |
1382 | ||
1383 | ret = trace_seq_printf(s, "%d %d %llu ", | |
1384 | entry->pid, iter->cpu, entry->t); | |
1385 | if (!ret) | |
1386 | return 0; | |
1387 | ||
1388 | switch (entry->type) { | |
1389 | case TRACE_FN: | |
1390 | ret = trace_seq_printf(s, "%x %x\n", | |
1391 | entry->fn.ip, entry->fn.parent_ip); | |
1392 | if (!ret) | |
1393 | return 0; | |
1394 | break; | |
1395 | case TRACE_CTX: | |
57422797 | 1396 | case TRACE_WAKE: |
f9896bf3 IM |
1397 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
1398 | state_to_char[entry->ctx.prev_state] : 'X'; | |
57422797 IM |
1399 | if (entry->type == TRACE_WAKE) |
1400 | S = '+'; | |
f9896bf3 IM |
1401 | ret = trace_seq_printf(s, "%d %d %c %d %d\n", |
1402 | entry->ctx.prev_pid, | |
1403 | entry->ctx.prev_prio, | |
1404 | S, | |
1405 | entry->ctx.next_pid, | |
1406 | entry->ctx.next_prio); | |
1407 | if (!ret) | |
1408 | return 0; | |
1409 | break; | |
f0a920d5 | 1410 | case TRACE_SPECIAL: |
86387f7e | 1411 | case TRACE_STACK: |
f0a920d5 IM |
1412 | ret = trace_seq_printf(s, " %lx %lx %lx\n", |
1413 | entry->special.arg1, | |
1414 | entry->special.arg2, | |
1415 | entry->special.arg3); | |
1416 | if (!ret) | |
1417 | return 0; | |
1418 | break; | |
f9896bf3 IM |
1419 | } |
1420 | return 1; | |
1421 | } | |
1422 | ||
cb0f12aa IM |
1423 | #define SEQ_PUT_FIELD_RET(s, x) \ |
1424 | do { \ | |
1425 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ | |
1426 | return 0; \ | |
1427 | } while (0) | |
1428 | ||
5e3ca0ec IM |
1429 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
1430 | do { \ | |
1431 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ | |
1432 | return 0; \ | |
1433 | } while (0) | |
1434 | ||
e309b41d | 1435 | static int print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec IM |
1436 | { |
1437 | struct trace_seq *s = &iter->seq; | |
1438 | unsigned char newline = '\n'; | |
1439 | struct trace_entry *entry; | |
1440 | int S; | |
1441 | ||
1442 | entry = iter->ent; | |
1443 | ||
1444 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); | |
1445 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); | |
1446 | SEQ_PUT_HEX_FIELD_RET(s, entry->t); | |
1447 | ||
1448 | switch (entry->type) { | |
1449 | case TRACE_FN: | |
1450 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.ip); | |
1451 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); | |
1452 | break; | |
1453 | case TRACE_CTX: | |
57422797 | 1454 | case TRACE_WAKE: |
5e3ca0ec IM |
1455 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
1456 | state_to_char[entry->ctx.prev_state] : 'X'; | |
57422797 IM |
1457 | if (entry->type == TRACE_WAKE) |
1458 | S = '+'; | |
5e3ca0ec IM |
1459 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_pid); |
1460 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_prio); | |
1461 | SEQ_PUT_HEX_FIELD_RET(s, S); | |
1462 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_pid); | |
1463 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_prio); | |
1464 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); | |
1465 | break; | |
1466 | case TRACE_SPECIAL: | |
86387f7e | 1467 | case TRACE_STACK: |
5e3ca0ec IM |
1468 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg1); |
1469 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg2); | |
1470 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg3); | |
1471 | break; | |
1472 | } | |
1473 | SEQ_PUT_FIELD_RET(s, newline); | |
1474 | ||
1475 | return 1; | |
1476 | } | |
1477 | ||
e309b41d | 1478 | static int print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa IM |
1479 | { |
1480 | struct trace_seq *s = &iter->seq; | |
1481 | struct trace_entry *entry; | |
1482 | ||
1483 | entry = iter->ent; | |
1484 | ||
1485 | SEQ_PUT_FIELD_RET(s, entry->pid); | |
1486 | SEQ_PUT_FIELD_RET(s, entry->cpu); | |
1487 | SEQ_PUT_FIELD_RET(s, entry->t); | |
1488 | ||
1489 | switch (entry->type) { | |
1490 | case TRACE_FN: | |
1491 | SEQ_PUT_FIELD_RET(s, entry->fn.ip); | |
1492 | SEQ_PUT_FIELD_RET(s, entry->fn.parent_ip); | |
1493 | break; | |
1494 | case TRACE_CTX: | |
1495 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_pid); | |
1496 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_prio); | |
1497 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_state); | |
1498 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_pid); | |
1499 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_prio); | |
1500 | break; | |
f0a920d5 | 1501 | case TRACE_SPECIAL: |
86387f7e | 1502 | case TRACE_STACK: |
f0a920d5 IM |
1503 | SEQ_PUT_FIELD_RET(s, entry->special.arg1); |
1504 | SEQ_PUT_FIELD_RET(s, entry->special.arg2); | |
1505 | SEQ_PUT_FIELD_RET(s, entry->special.arg3); | |
1506 | break; | |
cb0f12aa IM |
1507 | } |
1508 | return 1; | |
1509 | } | |
1510 | ||
bc0c38d1 SR |
1511 | static int trace_empty(struct trace_iterator *iter) |
1512 | { | |
1513 | struct trace_array_cpu *data; | |
1514 | int cpu; | |
1515 | ||
1516 | for_each_possible_cpu(cpu) { | |
1517 | data = iter->tr->data[cpu]; | |
1518 | ||
b3806b43 SR |
1519 | if (head_page(data) && data->trace_idx && |
1520 | (data->trace_tail != data->trace_head || | |
1521 | data->trace_tail_idx != data->trace_head_idx)) | |
bc0c38d1 SR |
1522 | return 0; |
1523 | } | |
1524 | return 1; | |
1525 | } | |
1526 | ||
f9896bf3 IM |
1527 | static int print_trace_line(struct trace_iterator *iter) |
1528 | { | |
cb0f12aa IM |
1529 | if (trace_flags & TRACE_ITER_BIN) |
1530 | return print_bin_fmt(iter); | |
1531 | ||
5e3ca0ec IM |
1532 | if (trace_flags & TRACE_ITER_HEX) |
1533 | return print_hex_fmt(iter); | |
1534 | ||
f9896bf3 IM |
1535 | if (trace_flags & TRACE_ITER_RAW) |
1536 | return print_raw_fmt(iter); | |
1537 | ||
1538 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
1539 | return print_lat_fmt(iter, iter->idx, iter->cpu); | |
1540 | ||
1541 | return print_trace_fmt(iter); | |
1542 | } | |
1543 | ||
bc0c38d1 SR |
1544 | static int s_show(struct seq_file *m, void *v) |
1545 | { | |
1546 | struct trace_iterator *iter = v; | |
1547 | ||
1548 | if (iter->ent == NULL) { | |
1549 | if (iter->tr) { | |
1550 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
1551 | seq_puts(m, "#\n"); | |
1552 | } | |
1553 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { | |
1554 | /* print nothing if the buffers are empty */ | |
1555 | if (trace_empty(iter)) | |
1556 | return 0; | |
1557 | print_trace_header(m, iter); | |
1558 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1559 | print_lat_help_header(m); | |
1560 | } else { | |
1561 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1562 | print_func_help_header(m); | |
1563 | } | |
1564 | } else { | |
f9896bf3 | 1565 | print_trace_line(iter); |
214023c3 | 1566 | trace_print_seq(m, &iter->seq); |
bc0c38d1 SR |
1567 | } |
1568 | ||
1569 | return 0; | |
1570 | } | |
1571 | ||
1572 | static struct seq_operations tracer_seq_ops = { | |
4bf39a94 IM |
1573 | .start = s_start, |
1574 | .next = s_next, | |
1575 | .stop = s_stop, | |
1576 | .show = s_show, | |
bc0c38d1 SR |
1577 | }; |
1578 | ||
e309b41d | 1579 | static struct trace_iterator * |
bc0c38d1 SR |
1580 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
1581 | { | |
1582 | struct trace_iterator *iter; | |
1583 | ||
60a11774 SR |
1584 | if (tracing_disabled) { |
1585 | *ret = -ENODEV; | |
1586 | return NULL; | |
1587 | } | |
1588 | ||
bc0c38d1 SR |
1589 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
1590 | if (!iter) { | |
1591 | *ret = -ENOMEM; | |
1592 | goto out; | |
1593 | } | |
1594 | ||
1595 | mutex_lock(&trace_types_lock); | |
1596 | if (current_trace && current_trace->print_max) | |
1597 | iter->tr = &max_tr; | |
1598 | else | |
1599 | iter->tr = inode->i_private; | |
1600 | iter->trace = current_trace; | |
1601 | iter->pos = -1; | |
1602 | ||
1603 | /* TODO stop tracer */ | |
1604 | *ret = seq_open(file, &tracer_seq_ops); | |
1605 | if (!*ret) { | |
1606 | struct seq_file *m = file->private_data; | |
1607 | m->private = iter; | |
1608 | ||
1609 | /* stop the trace while dumping */ | |
1610 | if (iter->tr->ctrl) | |
1611 | tracer_enabled = 0; | |
1612 | ||
1613 | if (iter->trace && iter->trace->open) | |
1614 | iter->trace->open(iter); | |
1615 | } else { | |
1616 | kfree(iter); | |
1617 | iter = NULL; | |
1618 | } | |
1619 | mutex_unlock(&trace_types_lock); | |
1620 | ||
1621 | out: | |
1622 | return iter; | |
1623 | } | |
1624 | ||
1625 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
1626 | { | |
60a11774 SR |
1627 | if (tracing_disabled) |
1628 | return -ENODEV; | |
1629 | ||
bc0c38d1 SR |
1630 | filp->private_data = inode->i_private; |
1631 | return 0; | |
1632 | } | |
1633 | ||
1634 | int tracing_release(struct inode *inode, struct file *file) | |
1635 | { | |
1636 | struct seq_file *m = (struct seq_file *)file->private_data; | |
1637 | struct trace_iterator *iter = m->private; | |
1638 | ||
1639 | mutex_lock(&trace_types_lock); | |
1640 | if (iter->trace && iter->trace->close) | |
1641 | iter->trace->close(iter); | |
1642 | ||
1643 | /* reenable tracing if it was previously enabled */ | |
1644 | if (iter->tr->ctrl) | |
1645 | tracer_enabled = 1; | |
1646 | mutex_unlock(&trace_types_lock); | |
1647 | ||
1648 | seq_release(inode, file); | |
1649 | kfree(iter); | |
1650 | return 0; | |
1651 | } | |
1652 | ||
1653 | static int tracing_open(struct inode *inode, struct file *file) | |
1654 | { | |
1655 | int ret; | |
1656 | ||
1657 | __tracing_open(inode, file, &ret); | |
1658 | ||
1659 | return ret; | |
1660 | } | |
1661 | ||
1662 | static int tracing_lt_open(struct inode *inode, struct file *file) | |
1663 | { | |
1664 | struct trace_iterator *iter; | |
1665 | int ret; | |
1666 | ||
1667 | iter = __tracing_open(inode, file, &ret); | |
1668 | ||
1669 | if (!ret) | |
1670 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
1671 | ||
1672 | return ret; | |
1673 | } | |
1674 | ||
1675 | ||
e309b41d | 1676 | static void * |
bc0c38d1 SR |
1677 | t_next(struct seq_file *m, void *v, loff_t *pos) |
1678 | { | |
1679 | struct tracer *t = m->private; | |
1680 | ||
1681 | (*pos)++; | |
1682 | ||
1683 | if (t) | |
1684 | t = t->next; | |
1685 | ||
1686 | m->private = t; | |
1687 | ||
1688 | return t; | |
1689 | } | |
1690 | ||
1691 | static void *t_start(struct seq_file *m, loff_t *pos) | |
1692 | { | |
1693 | struct tracer *t = m->private; | |
1694 | loff_t l = 0; | |
1695 | ||
1696 | mutex_lock(&trace_types_lock); | |
1697 | for (; t && l < *pos; t = t_next(m, t, &l)) | |
1698 | ; | |
1699 | ||
1700 | return t; | |
1701 | } | |
1702 | ||
1703 | static void t_stop(struct seq_file *m, void *p) | |
1704 | { | |
1705 | mutex_unlock(&trace_types_lock); | |
1706 | } | |
1707 | ||
1708 | static int t_show(struct seq_file *m, void *v) | |
1709 | { | |
1710 | struct tracer *t = v; | |
1711 | ||
1712 | if (!t) | |
1713 | return 0; | |
1714 | ||
1715 | seq_printf(m, "%s", t->name); | |
1716 | if (t->next) | |
1717 | seq_putc(m, ' '); | |
1718 | else | |
1719 | seq_putc(m, '\n'); | |
1720 | ||
1721 | return 0; | |
1722 | } | |
1723 | ||
1724 | static struct seq_operations show_traces_seq_ops = { | |
4bf39a94 IM |
1725 | .start = t_start, |
1726 | .next = t_next, | |
1727 | .stop = t_stop, | |
1728 | .show = t_show, | |
bc0c38d1 SR |
1729 | }; |
1730 | ||
1731 | static int show_traces_open(struct inode *inode, struct file *file) | |
1732 | { | |
1733 | int ret; | |
1734 | ||
60a11774 SR |
1735 | if (tracing_disabled) |
1736 | return -ENODEV; | |
1737 | ||
bc0c38d1 SR |
1738 | ret = seq_open(file, &show_traces_seq_ops); |
1739 | if (!ret) { | |
1740 | struct seq_file *m = file->private_data; | |
1741 | m->private = trace_types; | |
1742 | } | |
1743 | ||
1744 | return ret; | |
1745 | } | |
1746 | ||
1747 | static struct file_operations tracing_fops = { | |
4bf39a94 IM |
1748 | .open = tracing_open, |
1749 | .read = seq_read, | |
1750 | .llseek = seq_lseek, | |
1751 | .release = tracing_release, | |
bc0c38d1 SR |
1752 | }; |
1753 | ||
1754 | static struct file_operations tracing_lt_fops = { | |
4bf39a94 IM |
1755 | .open = tracing_lt_open, |
1756 | .read = seq_read, | |
1757 | .llseek = seq_lseek, | |
1758 | .release = tracing_release, | |
bc0c38d1 SR |
1759 | }; |
1760 | ||
1761 | static struct file_operations show_traces_fops = { | |
1762 | .open = show_traces_open, | |
1763 | .read = seq_read, | |
1764 | .release = seq_release, | |
1765 | }; | |
1766 | ||
1767 | static ssize_t | |
1768 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, | |
1769 | size_t cnt, loff_t *ppos) | |
1770 | { | |
1771 | char *buf; | |
1772 | int r = 0; | |
1773 | int len = 0; | |
1774 | int i; | |
1775 | ||
1776 | /* calulate max size */ | |
1777 | for (i = 0; trace_options[i]; i++) { | |
1778 | len += strlen(trace_options[i]); | |
1779 | len += 3; /* "no" and space */ | |
1780 | } | |
1781 | ||
1782 | /* +2 for \n and \0 */ | |
1783 | buf = kmalloc(len + 2, GFP_KERNEL); | |
1784 | if (!buf) | |
1785 | return -ENOMEM; | |
1786 | ||
1787 | for (i = 0; trace_options[i]; i++) { | |
1788 | if (trace_flags & (1 << i)) | |
1789 | r += sprintf(buf + r, "%s ", trace_options[i]); | |
1790 | else | |
1791 | r += sprintf(buf + r, "no%s ", trace_options[i]); | |
1792 | } | |
1793 | ||
1794 | r += sprintf(buf + r, "\n"); | |
1795 | WARN_ON(r >= len + 2); | |
1796 | ||
1797 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
1798 | buf, r); | |
1799 | ||
1800 | kfree(buf); | |
1801 | ||
1802 | return r; | |
1803 | } | |
1804 | ||
1805 | static ssize_t | |
1806 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, | |
1807 | size_t cnt, loff_t *ppos) | |
1808 | { | |
1809 | char buf[64]; | |
1810 | char *cmp = buf; | |
1811 | int neg = 0; | |
1812 | int i; | |
1813 | ||
1814 | if (cnt > 63) | |
1815 | cnt = 63; | |
1816 | ||
1817 | if (copy_from_user(&buf, ubuf, cnt)) | |
1818 | return -EFAULT; | |
1819 | ||
1820 | buf[cnt] = 0; | |
1821 | ||
1822 | if (strncmp(buf, "no", 2) == 0) { | |
1823 | neg = 1; | |
1824 | cmp += 2; | |
1825 | } | |
1826 | ||
1827 | for (i = 0; trace_options[i]; i++) { | |
1828 | int len = strlen(trace_options[i]); | |
1829 | ||
1830 | if (strncmp(cmp, trace_options[i], len) == 0) { | |
1831 | if (neg) | |
1832 | trace_flags &= ~(1 << i); | |
1833 | else | |
1834 | trace_flags |= (1 << i); | |
1835 | break; | |
1836 | } | |
1837 | } | |
1838 | ||
1839 | filp->f_pos += cnt; | |
1840 | ||
1841 | return cnt; | |
1842 | } | |
1843 | ||
1844 | static struct file_operations tracing_iter_fops = { | |
1845 | .open = tracing_open_generic, | |
1846 | .read = tracing_iter_ctrl_read, | |
1847 | .write = tracing_iter_ctrl_write, | |
1848 | }; | |
1849 | ||
7bd2f24c IM |
1850 | static const char readme_msg[] = |
1851 | "tracing mini-HOWTO:\n\n" | |
1852 | "# mkdir /debug\n" | |
1853 | "# mount -t debugfs nodev /debug\n\n" | |
1854 | "# cat /debug/tracing/available_tracers\n" | |
1855 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" | |
1856 | "# cat /debug/tracing/current_tracer\n" | |
1857 | "none\n" | |
1858 | "# echo sched_switch > /debug/tracing/current_tracer\n" | |
1859 | "# cat /debug/tracing/current_tracer\n" | |
1860 | "sched_switch\n" | |
1861 | "# cat /debug/tracing/iter_ctrl\n" | |
1862 | "noprint-parent nosym-offset nosym-addr noverbose\n" | |
1863 | "# echo print-parent > /debug/tracing/iter_ctrl\n" | |
1864 | "# echo 1 > /debug/tracing/tracing_enabled\n" | |
1865 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" | |
1866 | "echo 0 > /debug/tracing/tracing_enabled\n" | |
1867 | ; | |
1868 | ||
1869 | static ssize_t | |
1870 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
1871 | size_t cnt, loff_t *ppos) | |
1872 | { | |
1873 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
1874 | readme_msg, strlen(readme_msg)); | |
1875 | } | |
1876 | ||
1877 | static struct file_operations tracing_readme_fops = { | |
1878 | .open = tracing_open_generic, | |
1879 | .read = tracing_readme_read, | |
1880 | }; | |
1881 | ||
bc0c38d1 SR |
1882 | static ssize_t |
1883 | tracing_ctrl_read(struct file *filp, char __user *ubuf, | |
1884 | size_t cnt, loff_t *ppos) | |
1885 | { | |
1886 | struct trace_array *tr = filp->private_data; | |
1887 | char buf[64]; | |
1888 | int r; | |
1889 | ||
1890 | r = sprintf(buf, "%ld\n", tr->ctrl); | |
4e3c3333 | 1891 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
1892 | } |
1893 | ||
1894 | static ssize_t | |
1895 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, | |
1896 | size_t cnt, loff_t *ppos) | |
1897 | { | |
1898 | struct trace_array *tr = filp->private_data; | |
1899 | long val; | |
1900 | char buf[64]; | |
1901 | ||
1902 | if (cnt > 63) | |
1903 | cnt = 63; | |
1904 | ||
1905 | if (copy_from_user(&buf, ubuf, cnt)) | |
1906 | return -EFAULT; | |
1907 | ||
1908 | buf[cnt] = 0; | |
1909 | ||
1910 | val = simple_strtoul(buf, NULL, 10); | |
1911 | ||
1912 | val = !!val; | |
1913 | ||
1914 | mutex_lock(&trace_types_lock); | |
1915 | if (tr->ctrl ^ val) { | |
1916 | if (val) | |
1917 | tracer_enabled = 1; | |
1918 | else | |
1919 | tracer_enabled = 0; | |
1920 | ||
1921 | tr->ctrl = val; | |
1922 | ||
1923 | if (current_trace && current_trace->ctrl_update) | |
1924 | current_trace->ctrl_update(tr); | |
1925 | } | |
1926 | mutex_unlock(&trace_types_lock); | |
1927 | ||
1928 | filp->f_pos += cnt; | |
1929 | ||
1930 | return cnt; | |
1931 | } | |
1932 | ||
1933 | static ssize_t | |
1934 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
1935 | size_t cnt, loff_t *ppos) | |
1936 | { | |
1937 | char buf[max_tracer_type_len+2]; | |
1938 | int r; | |
1939 | ||
1940 | mutex_lock(&trace_types_lock); | |
1941 | if (current_trace) | |
1942 | r = sprintf(buf, "%s\n", current_trace->name); | |
1943 | else | |
1944 | r = sprintf(buf, "\n"); | |
1945 | mutex_unlock(&trace_types_lock); | |
1946 | ||
4bf39a94 | 1947 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
1948 | } |
1949 | ||
1950 | static ssize_t | |
1951 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
1952 | size_t cnt, loff_t *ppos) | |
1953 | { | |
1954 | struct trace_array *tr = &global_trace; | |
1955 | struct tracer *t; | |
1956 | char buf[max_tracer_type_len+1]; | |
1957 | int i; | |
1958 | ||
1959 | if (cnt > max_tracer_type_len) | |
1960 | cnt = max_tracer_type_len; | |
1961 | ||
1962 | if (copy_from_user(&buf, ubuf, cnt)) | |
1963 | return -EFAULT; | |
1964 | ||
1965 | buf[cnt] = 0; | |
1966 | ||
1967 | /* strip ending whitespace. */ | |
1968 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
1969 | buf[i] = 0; | |
1970 | ||
1971 | mutex_lock(&trace_types_lock); | |
1972 | for (t = trace_types; t; t = t->next) { | |
1973 | if (strcmp(t->name, buf) == 0) | |
1974 | break; | |
1975 | } | |
1976 | if (!t || t == current_trace) | |
1977 | goto out; | |
1978 | ||
1979 | if (current_trace && current_trace->reset) | |
1980 | current_trace->reset(tr); | |
1981 | ||
1982 | current_trace = t; | |
1983 | if (t->init) | |
1984 | t->init(tr); | |
1985 | ||
1986 | out: | |
1987 | mutex_unlock(&trace_types_lock); | |
1988 | ||
1989 | filp->f_pos += cnt; | |
1990 | ||
1991 | return cnt; | |
1992 | } | |
1993 | ||
1994 | static ssize_t | |
1995 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
1996 | size_t cnt, loff_t *ppos) | |
1997 | { | |
1998 | unsigned long *ptr = filp->private_data; | |
1999 | char buf[64]; | |
2000 | int r; | |
2001 | ||
2002 | r = snprintf(buf, 64, "%ld\n", | |
2003 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); | |
2004 | if (r > 64) | |
2005 | r = 64; | |
4bf39a94 | 2006 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2007 | } |
2008 | ||
2009 | static ssize_t | |
2010 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
2011 | size_t cnt, loff_t *ppos) | |
2012 | { | |
2013 | long *ptr = filp->private_data; | |
2014 | long val; | |
2015 | char buf[64]; | |
2016 | ||
2017 | if (cnt > 63) | |
2018 | cnt = 63; | |
2019 | ||
2020 | if (copy_from_user(&buf, ubuf, cnt)) | |
2021 | return -EFAULT; | |
2022 | ||
2023 | buf[cnt] = 0; | |
2024 | ||
2025 | val = simple_strtoul(buf, NULL, 10); | |
2026 | ||
2027 | *ptr = val * 1000; | |
2028 | ||
2029 | return cnt; | |
2030 | } | |
2031 | ||
b3806b43 SR |
2032 | static atomic_t tracing_reader; |
2033 | ||
2034 | static int tracing_open_pipe(struct inode *inode, struct file *filp) | |
2035 | { | |
2036 | struct trace_iterator *iter; | |
2037 | ||
2038 | if (tracing_disabled) | |
2039 | return -ENODEV; | |
2040 | ||
2041 | /* We only allow for reader of the pipe */ | |
2042 | if (atomic_inc_return(&tracing_reader) != 1) { | |
2043 | atomic_dec(&tracing_reader); | |
2044 | return -EBUSY; | |
2045 | } | |
2046 | ||
2047 | /* create a buffer to store the information to pass to userspace */ | |
2048 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
2049 | if (!iter) | |
2050 | return -ENOMEM; | |
2051 | ||
2052 | iter->tr = &global_trace; | |
2053 | ||
2054 | filp->private_data = iter; | |
2055 | ||
2056 | return 0; | |
2057 | } | |
2058 | ||
2059 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
2060 | { | |
2061 | struct trace_iterator *iter = file->private_data; | |
2062 | ||
2063 | kfree(iter); | |
2064 | atomic_dec(&tracing_reader); | |
2065 | ||
2066 | return 0; | |
2067 | } | |
2068 | ||
2a2cc8f7 SSP |
2069 | static unsigned int |
2070 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) | |
2071 | { | |
2072 | struct trace_iterator *iter = filp->private_data; | |
2073 | ||
2074 | if (trace_flags & TRACE_ITER_BLOCK) { | |
2075 | /* | |
2076 | * Always select as readable when in blocking mode | |
2077 | */ | |
2078 | return POLLIN | POLLRDNORM; | |
2079 | } | |
2080 | else { | |
2081 | if (!trace_empty(iter)) | |
2082 | return POLLIN | POLLRDNORM; | |
2083 | poll_wait(filp, &trace_wait, poll_table); | |
2084 | if (!trace_empty(iter)) | |
2085 | return POLLIN | POLLRDNORM; | |
2086 | ||
2087 | return 0; | |
2088 | } | |
2089 | } | |
2090 | ||
b3806b43 SR |
2091 | /* |
2092 | * Consumer reader. | |
2093 | */ | |
2094 | static ssize_t | |
2095 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
2096 | size_t cnt, loff_t *ppos) | |
2097 | { | |
2098 | struct trace_iterator *iter = filp->private_data; | |
2099 | struct trace_array_cpu *data; | |
2100 | static cpumask_t mask; | |
b3806b43 SR |
2101 | static int start; |
2102 | unsigned long flags; | |
25770467 | 2103 | #ifdef CONFIG_FTRACE |
2e0f5761 | 2104 | int ftrace_save; |
25770467 | 2105 | #endif |
b3806b43 SR |
2106 | int read = 0; |
2107 | int cpu; | |
2108 | int len; | |
2109 | int ret; | |
2110 | ||
2111 | /* return any leftover data */ | |
2112 | if (iter->seq.len > start) { | |
2113 | len = iter->seq.len - start; | |
2114 | if (cnt > len) | |
2115 | cnt = len; | |
2116 | ret = copy_to_user(ubuf, iter->seq.buffer + start, cnt); | |
2117 | if (ret) | |
2118 | cnt = -EFAULT; | |
2119 | ||
2120 | start += len; | |
2121 | ||
2122 | return cnt; | |
2123 | } | |
2124 | ||
2125 | trace_seq_reset(&iter->seq); | |
2126 | start = 0; | |
2127 | ||
2128 | while (trace_empty(iter)) { | |
2a2cc8f7 SSP |
2129 | if (!(trace_flags & TRACE_ITER_BLOCK)) |
2130 | return -EWOULDBLOCK; | |
b3806b43 SR |
2131 | /* |
2132 | * This is a make-shift waitqueue. The reason we don't use | |
2133 | * an actual wait queue is because: | |
2134 | * 1) we only ever have one waiter | |
2135 | * 2) the tracing, traces all functions, we don't want | |
2136 | * the overhead of calling wake_up and friends | |
2137 | * (and tracing them too) | |
2138 | * Anyway, this is really very primitive wakeup. | |
2139 | */ | |
2140 | set_current_state(TASK_INTERRUPTIBLE); | |
2141 | iter->tr->waiter = current; | |
2142 | ||
2143 | /* sleep for one second, and try again. */ | |
2144 | schedule_timeout(HZ); | |
2145 | ||
2146 | iter->tr->waiter = NULL; | |
2147 | ||
2148 | if (signal_pending(current)) | |
2149 | return -EINTR; | |
2150 | ||
2151 | /* | |
2152 | * We block until we read something and tracing is disabled. | |
2153 | * We still block if tracing is disabled, but we have never | |
2154 | * read anything. This allows a user to cat this file, and | |
2155 | * then enable tracing. But after we have read something, | |
2156 | * we give an EOF when tracing is again disabled. | |
2157 | * | |
2158 | * iter->pos will be 0 if we haven't read anything. | |
2159 | */ | |
2160 | if (!tracer_enabled && iter->pos) | |
2161 | break; | |
2162 | ||
2163 | continue; | |
2164 | } | |
2165 | ||
2166 | /* stop when tracing is finished */ | |
2167 | if (trace_empty(iter)) | |
2168 | return 0; | |
2169 | ||
2170 | if (cnt >= PAGE_SIZE) | |
2171 | cnt = PAGE_SIZE - 1; | |
2172 | ||
2173 | memset(iter, 0, sizeof(*iter)); | |
2174 | iter->tr = &global_trace; | |
2175 | iter->pos = -1; | |
2176 | ||
2177 | /* | |
2178 | * We need to stop all tracing on all CPUS to read the | |
2179 | * the next buffer. This is a bit expensive, but is | |
2180 | * not done often. We fill all what we can read, | |
2181 | * and then release the locks again. | |
2182 | */ | |
2183 | ||
2184 | cpus_clear(mask); | |
2185 | local_irq_save(flags); | |
25770467 | 2186 | #ifdef CONFIG_FTRACE |
2e0f5761 IM |
2187 | ftrace_save = ftrace_enabled; |
2188 | ftrace_enabled = 0; | |
25770467 | 2189 | #endif |
2e0f5761 | 2190 | smp_wmb(); |
b3806b43 SR |
2191 | for_each_possible_cpu(cpu) { |
2192 | data = iter->tr->data[cpu]; | |
2193 | ||
2194 | if (!head_page(data) || !data->trace_idx) | |
2195 | continue; | |
2196 | ||
2197 | atomic_inc(&data->disabled); | |
b3806b43 SR |
2198 | cpu_set(cpu, mask); |
2199 | } | |
2200 | ||
2e0f5761 IM |
2201 | for_each_cpu_mask(cpu, mask) { |
2202 | data = iter->tr->data[cpu]; | |
2203 | spin_lock(&data->lock); | |
2204 | } | |
2205 | ||
088b1e42 SR |
2206 | while (find_next_entry_inc(iter) != NULL) { |
2207 | int len = iter->seq.len; | |
2208 | ||
f9896bf3 | 2209 | ret = print_trace_line(iter); |
088b1e42 SR |
2210 | if (!ret) { |
2211 | /* don't print partial lines */ | |
2212 | iter->seq.len = len; | |
b3806b43 | 2213 | break; |
088b1e42 | 2214 | } |
b3806b43 SR |
2215 | |
2216 | trace_consume(iter); | |
2217 | ||
2218 | if (iter->seq.len >= cnt) | |
2219 | break; | |
b3806b43 SR |
2220 | } |
2221 | ||
d4c5a2f5 | 2222 | for_each_cpu_mask(cpu, mask) { |
b3806b43 | 2223 | data = iter->tr->data[cpu]; |
b3806b43 | 2224 | spin_unlock(&data->lock); |
2e0f5761 IM |
2225 | } |
2226 | ||
2227 | for_each_cpu_mask(cpu, mask) { | |
2228 | data = iter->tr->data[cpu]; | |
b3806b43 SR |
2229 | atomic_dec(&data->disabled); |
2230 | } | |
25770467 | 2231 | #ifdef CONFIG_FTRACE |
2e0f5761 | 2232 | ftrace_enabled = ftrace_save; |
25770467 | 2233 | #endif |
b3806b43 SR |
2234 | local_irq_restore(flags); |
2235 | ||
2236 | /* Now copy what we have to the user */ | |
2237 | read = iter->seq.len; | |
2238 | if (read > cnt) | |
2239 | read = cnt; | |
2240 | ||
2241 | ret = copy_to_user(ubuf, iter->seq.buffer, read); | |
2242 | ||
2243 | if (read < iter->seq.len) | |
2244 | start = read; | |
2245 | else | |
2246 | trace_seq_reset(&iter->seq); | |
2247 | ||
2248 | if (ret) | |
2249 | read = -EFAULT; | |
2250 | ||
2251 | return read; | |
2252 | } | |
2253 | ||
bc0c38d1 | 2254 | static struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
2255 | .open = tracing_open_generic, |
2256 | .read = tracing_max_lat_read, | |
2257 | .write = tracing_max_lat_write, | |
bc0c38d1 SR |
2258 | }; |
2259 | ||
2260 | static struct file_operations tracing_ctrl_fops = { | |
4bf39a94 IM |
2261 | .open = tracing_open_generic, |
2262 | .read = tracing_ctrl_read, | |
2263 | .write = tracing_ctrl_write, | |
bc0c38d1 SR |
2264 | }; |
2265 | ||
2266 | static struct file_operations set_tracer_fops = { | |
4bf39a94 IM |
2267 | .open = tracing_open_generic, |
2268 | .read = tracing_set_trace_read, | |
2269 | .write = tracing_set_trace_write, | |
bc0c38d1 SR |
2270 | }; |
2271 | ||
b3806b43 | 2272 | static struct file_operations tracing_pipe_fops = { |
4bf39a94 | 2273 | .open = tracing_open_pipe, |
2a2cc8f7 | 2274 | .poll = tracing_poll_pipe, |
4bf39a94 IM |
2275 | .read = tracing_read_pipe, |
2276 | .release = tracing_release_pipe, | |
b3806b43 SR |
2277 | }; |
2278 | ||
bc0c38d1 SR |
2279 | #ifdef CONFIG_DYNAMIC_FTRACE |
2280 | ||
2281 | static ssize_t | |
2282 | tracing_read_long(struct file *filp, char __user *ubuf, | |
2283 | size_t cnt, loff_t *ppos) | |
2284 | { | |
2285 | unsigned long *p = filp->private_data; | |
2286 | char buf[64]; | |
2287 | int r; | |
2288 | ||
2289 | r = sprintf(buf, "%ld\n", *p); | |
4bf39a94 IM |
2290 | |
2291 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
bc0c38d1 SR |
2292 | } |
2293 | ||
2294 | static struct file_operations tracing_read_long_fops = { | |
4bf39a94 IM |
2295 | .open = tracing_open_generic, |
2296 | .read = tracing_read_long, | |
bc0c38d1 SR |
2297 | }; |
2298 | #endif | |
2299 | ||
2300 | static struct dentry *d_tracer; | |
2301 | ||
2302 | struct dentry *tracing_init_dentry(void) | |
2303 | { | |
2304 | static int once; | |
2305 | ||
2306 | if (d_tracer) | |
2307 | return d_tracer; | |
2308 | ||
2309 | d_tracer = debugfs_create_dir("tracing", NULL); | |
2310 | ||
2311 | if (!d_tracer && !once) { | |
2312 | once = 1; | |
2313 | pr_warning("Could not create debugfs directory 'tracing'\n"); | |
2314 | return NULL; | |
2315 | } | |
2316 | ||
2317 | return d_tracer; | |
2318 | } | |
2319 | ||
60a11774 SR |
2320 | #ifdef CONFIG_FTRACE_SELFTEST |
2321 | /* Let selftest have access to static functions in this file */ | |
2322 | #include "trace_selftest.c" | |
2323 | #endif | |
2324 | ||
bc0c38d1 SR |
2325 | static __init void tracer_init_debugfs(void) |
2326 | { | |
2327 | struct dentry *d_tracer; | |
2328 | struct dentry *entry; | |
2329 | ||
2330 | d_tracer = tracing_init_dentry(); | |
2331 | ||
2332 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, | |
2333 | &global_trace, &tracing_ctrl_fops); | |
2334 | if (!entry) | |
2335 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); | |
2336 | ||
2337 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, | |
2338 | NULL, &tracing_iter_fops); | |
2339 | if (!entry) | |
2340 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); | |
2341 | ||
2342 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, | |
2343 | &global_trace, &tracing_lt_fops); | |
2344 | if (!entry) | |
2345 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); | |
2346 | ||
2347 | entry = debugfs_create_file("trace", 0444, d_tracer, | |
2348 | &global_trace, &tracing_fops); | |
2349 | if (!entry) | |
2350 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2351 | ||
2352 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, | |
2353 | &global_trace, &show_traces_fops); | |
2354 | if (!entry) | |
2355 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2356 | ||
2357 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, | |
2358 | &global_trace, &set_tracer_fops); | |
2359 | if (!entry) | |
2360 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2361 | ||
2362 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, | |
2363 | &tracing_max_latency, | |
2364 | &tracing_max_lat_fops); | |
2365 | if (!entry) | |
2366 | pr_warning("Could not create debugfs " | |
2367 | "'tracing_max_latency' entry\n"); | |
2368 | ||
2369 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, | |
2370 | &tracing_thresh, &tracing_max_lat_fops); | |
2371 | if (!entry) | |
2372 | pr_warning("Could not create debugfs " | |
2373 | "'tracing_threash' entry\n"); | |
7bd2f24c IM |
2374 | entry = debugfs_create_file("README", 0644, d_tracer, |
2375 | NULL, &tracing_readme_fops); | |
2376 | if (!entry) | |
2377 | pr_warning("Could not create debugfs 'README' entry\n"); | |
2378 | ||
b3806b43 SR |
2379 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
2380 | NULL, &tracing_pipe_fops); | |
2381 | if (!entry) | |
2382 | pr_warning("Could not create debugfs " | |
2383 | "'tracing_threash' entry\n"); | |
bc0c38d1 SR |
2384 | |
2385 | #ifdef CONFIG_DYNAMIC_FTRACE | |
2386 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, | |
2387 | &ftrace_update_tot_cnt, | |
2388 | &tracing_read_long_fops); | |
2389 | if (!entry) | |
2390 | pr_warning("Could not create debugfs " | |
2391 | "'dyn_ftrace_total_info' entry\n"); | |
2392 | #endif | |
2393 | } | |
2394 | ||
2395 | /* dummy trace to disable tracing */ | |
2396 | static struct tracer no_tracer __read_mostly = | |
2397 | { | |
4bf39a94 | 2398 | .name = "none", |
bc0c38d1 SR |
2399 | }; |
2400 | ||
4c11d7ae | 2401 | static int trace_alloc_page(void) |
bc0c38d1 | 2402 | { |
4c11d7ae | 2403 | struct trace_array_cpu *data; |
4c11d7ae SR |
2404 | struct page *page, *tmp; |
2405 | LIST_HEAD(pages); | |
c7aafc54 | 2406 | void *array; |
4c11d7ae SR |
2407 | int i; |
2408 | ||
2409 | /* first allocate a page for each CPU */ | |
2410 | for_each_possible_cpu(i) { | |
2411 | array = (void *)__get_free_page(GFP_KERNEL); | |
2412 | if (array == NULL) { | |
2413 | printk(KERN_ERR "tracer: failed to allocate page" | |
2414 | "for trace buffer!\n"); | |
2415 | goto free_pages; | |
2416 | } | |
2417 | ||
2418 | page = virt_to_page(array); | |
2419 | list_add(&page->lru, &pages); | |
2420 | ||
2421 | /* Only allocate if we are actually using the max trace */ | |
2422 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2423 | array = (void *)__get_free_page(GFP_KERNEL); | |
2424 | if (array == NULL) { | |
2425 | printk(KERN_ERR "tracer: failed to allocate page" | |
2426 | "for trace buffer!\n"); | |
2427 | goto free_pages; | |
2428 | } | |
2429 | page = virt_to_page(array); | |
2430 | list_add(&page->lru, &pages); | |
2431 | #endif | |
2432 | } | |
2433 | ||
2434 | /* Now that we successfully allocate a page per CPU, add them */ | |
2435 | for_each_possible_cpu(i) { | |
2436 | data = global_trace.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 | ClearPageLRU(page); | |
2443 | ||
2444 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2445 | data = max_tr.data[i]; | |
b3806b43 | 2446 | spin_lock_init(&data->lock); |
d4c5a2f5 | 2447 | lockdep_set_class(&data->lock, &data->lock_key); |
4c11d7ae | 2448 | page = list_entry(pages.next, struct page, lru); |
c7aafc54 | 2449 | list_del_init(&page->lru); |
4c11d7ae SR |
2450 | list_add_tail(&page->lru, &data->trace_pages); |
2451 | SetPageLRU(page); | |
2452 | #endif | |
2453 | } | |
2454 | global_trace.entries += ENTRIES_PER_PAGE; | |
2455 | ||
2456 | return 0; | |
2457 | ||
2458 | free_pages: | |
2459 | list_for_each_entry_safe(page, tmp, &pages, lru) { | |
c7aafc54 | 2460 | list_del_init(&page->lru); |
4c11d7ae SR |
2461 | __free_page(page); |
2462 | } | |
2463 | return -ENOMEM; | |
bc0c38d1 SR |
2464 | } |
2465 | ||
2466 | __init static int tracer_alloc_buffers(void) | |
2467 | { | |
4c11d7ae SR |
2468 | struct trace_array_cpu *data; |
2469 | void *array; | |
2470 | struct page *page; | |
2471 | int pages = 0; | |
60a11774 | 2472 | int ret = -ENOMEM; |
bc0c38d1 SR |
2473 | int i; |
2474 | ||
26994ead SR |
2475 | global_trace.ctrl = tracer_enabled; |
2476 | ||
4c11d7ae | 2477 | /* Allocate the first page for all buffers */ |
bc0c38d1 | 2478 | for_each_possible_cpu(i) { |
4c11d7ae | 2479 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
bc0c38d1 SR |
2480 | max_tr.data[i] = &per_cpu(max_data, i); |
2481 | ||
4c11d7ae | 2482 | array = (void *)__get_free_page(GFP_KERNEL); |
bc0c38d1 | 2483 | if (array == NULL) { |
4c11d7ae SR |
2484 | printk(KERN_ERR "tracer: failed to allocate page" |
2485 | "for trace buffer!\n"); | |
bc0c38d1 SR |
2486 | goto free_buffers; |
2487 | } | |
4c11d7ae SR |
2488 | |
2489 | /* set the array to the list */ | |
2490 | INIT_LIST_HEAD(&data->trace_pages); | |
2491 | page = virt_to_page(array); | |
2492 | list_add(&page->lru, &data->trace_pages); | |
2493 | /* use the LRU flag to differentiate the two buffers */ | |
2494 | ClearPageLRU(page); | |
bc0c38d1 SR |
2495 | |
2496 | /* Only allocate if we are actually using the max trace */ | |
2497 | #ifdef CONFIG_TRACER_MAX_TRACE | |
4c11d7ae | 2498 | array = (void *)__get_free_page(GFP_KERNEL); |
bc0c38d1 | 2499 | if (array == NULL) { |
4c11d7ae SR |
2500 | printk(KERN_ERR "tracer: failed to allocate page" |
2501 | "for trace buffer!\n"); | |
bc0c38d1 SR |
2502 | goto free_buffers; |
2503 | } | |
4c11d7ae SR |
2504 | |
2505 | INIT_LIST_HEAD(&max_tr.data[i]->trace_pages); | |
2506 | page = virt_to_page(array); | |
2507 | list_add(&page->lru, &max_tr.data[i]->trace_pages); | |
2508 | SetPageLRU(page); | |
bc0c38d1 SR |
2509 | #endif |
2510 | } | |
2511 | ||
2512 | /* | |
2513 | * Since we allocate by orders of pages, we may be able to | |
2514 | * round up a bit. | |
2515 | */ | |
4c11d7ae | 2516 | global_trace.entries = ENTRIES_PER_PAGE; |
4c11d7ae SR |
2517 | pages++; |
2518 | ||
2519 | while (global_trace.entries < trace_nr_entries) { | |
2520 | if (trace_alloc_page()) | |
2521 | break; | |
2522 | pages++; | |
2523 | } | |
89b2f978 | 2524 | max_tr.entries = global_trace.entries; |
bc0c38d1 | 2525 | |
4c11d7ae SR |
2526 | pr_info("tracer: %d pages allocated for %ld", |
2527 | pages, trace_nr_entries); | |
bc0c38d1 SR |
2528 | pr_info(" entries of %ld bytes\n", (long)TRACE_ENTRY_SIZE); |
2529 | pr_info(" actual entries %ld\n", global_trace.entries); | |
2530 | ||
2531 | tracer_init_debugfs(); | |
2532 | ||
2533 | trace_init_cmdlines(); | |
2534 | ||
2535 | register_tracer(&no_tracer); | |
2536 | current_trace = &no_tracer; | |
2537 | ||
60a11774 SR |
2538 | /* All seems OK, enable tracing */ |
2539 | tracing_disabled = 0; | |
2540 | ||
bc0c38d1 SR |
2541 | return 0; |
2542 | ||
2543 | free_buffers: | |
2544 | for (i-- ; i >= 0; i--) { | |
4c11d7ae | 2545 | struct page *page, *tmp; |
bc0c38d1 SR |
2546 | struct trace_array_cpu *data = global_trace.data[i]; |
2547 | ||
c7aafc54 | 2548 | if (data) { |
4c11d7ae SR |
2549 | list_for_each_entry_safe(page, tmp, |
2550 | &data->trace_pages, lru) { | |
c7aafc54 | 2551 | list_del_init(&page->lru); |
4c11d7ae SR |
2552 | __free_page(page); |
2553 | } | |
bc0c38d1 SR |
2554 | } |
2555 | ||
2556 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2557 | data = max_tr.data[i]; | |
c7aafc54 | 2558 | if (data) { |
4c11d7ae SR |
2559 | list_for_each_entry_safe(page, tmp, |
2560 | &data->trace_pages, lru) { | |
c7aafc54 | 2561 | list_del_init(&page->lru); |
4c11d7ae SR |
2562 | __free_page(page); |
2563 | } | |
bc0c38d1 SR |
2564 | } |
2565 | #endif | |
2566 | } | |
60a11774 | 2567 | return ret; |
bc0c38d1 | 2568 | } |
60a11774 | 2569 | fs_initcall(tracer_alloc_buffers); |