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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 | ||
a98a3c3f SR |
38 | /* dummy trace to disable tracing */ |
39 | static struct tracer no_tracer __read_mostly = | |
40 | { | |
41 | .name = "none", | |
42 | }; | |
43 | ||
44 | static int trace_alloc_page(void); | |
45 | static int trace_free_page(void); | |
46 | ||
60a11774 SR |
47 | static int tracing_disabled = 1; |
48 | ||
72829bc3 | 49 | long |
bc0c38d1 SR |
50 | ns2usecs(cycle_t nsec) |
51 | { | |
52 | nsec += 500; | |
53 | do_div(nsec, 1000); | |
54 | return nsec; | |
55 | } | |
56 | ||
e309b41d | 57 | cycle_t ftrace_now(int cpu) |
750ed1a4 | 58 | { |
0fd9e0da | 59 | return cpu_clock(cpu); |
750ed1a4 IM |
60 | } |
61 | ||
bc0c38d1 SR |
62 | static struct trace_array global_trace; |
63 | ||
64 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); | |
65 | ||
66 | static struct trace_array max_tr; | |
67 | ||
68 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); | |
69 | ||
26994ead | 70 | static int tracer_enabled = 1; |
57422797 | 71 | static unsigned long trace_nr_entries = 65536UL; |
bc0c38d1 SR |
72 | |
73 | static struct tracer *trace_types __read_mostly; | |
74 | static struct tracer *current_trace __read_mostly; | |
75 | static int max_tracer_type_len; | |
76 | ||
77 | static DEFINE_MUTEX(trace_types_lock); | |
4e655519 IM |
78 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
79 | ||
80 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT; | |
81 | ||
4e655519 IM |
82 | void trace_wake_up(void) |
83 | { | |
017730c1 IM |
84 | /* |
85 | * The runqueue_is_locked() can fail, but this is the best we | |
86 | * have for now: | |
87 | */ | |
88 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) | |
4e655519 IM |
89 | wake_up(&trace_wait); |
90 | } | |
bc0c38d1 | 91 | |
4c11d7ae SR |
92 | #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(struct trace_entry)) |
93 | ||
bc0c38d1 SR |
94 | static int __init set_nr_entries(char *str) |
95 | { | |
96 | if (!str) | |
97 | return 0; | |
98 | trace_nr_entries = simple_strtoul(str, &str, 0); | |
99 | return 1; | |
100 | } | |
101 | __setup("trace_entries=", set_nr_entries); | |
102 | ||
57f50be1 SR |
103 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
104 | { | |
105 | return nsecs / 1000; | |
106 | } | |
107 | ||
bc0c38d1 SR |
108 | enum trace_flag_type { |
109 | TRACE_FLAG_IRQS_OFF = 0x01, | |
110 | TRACE_FLAG_NEED_RESCHED = 0x02, | |
111 | TRACE_FLAG_HARDIRQ = 0x04, | |
112 | TRACE_FLAG_SOFTIRQ = 0x08, | |
113 | }; | |
114 | ||
bc0c38d1 SR |
115 | #define TRACE_ITER_SYM_MASK \ |
116 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
117 | ||
118 | /* These must match the bit postions above */ | |
119 | static const char *trace_options[] = { | |
120 | "print-parent", | |
121 | "sym-offset", | |
122 | "sym-addr", | |
123 | "verbose", | |
f9896bf3 | 124 | "raw", |
5e3ca0ec | 125 | "hex", |
cb0f12aa | 126 | "bin", |
2a2cc8f7 | 127 | "block", |
86387f7e | 128 | "stacktrace", |
4ac3ba41 | 129 | "sched-tree", |
bc0c38d1 SR |
130 | NULL |
131 | }; | |
132 | ||
92205c23 SR |
133 | static raw_spinlock_t ftrace_max_lock = |
134 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; | |
bc0c38d1 SR |
135 | |
136 | /* | |
137 | * Copy the new maximum trace into the separate maximum-trace | |
138 | * structure. (this way the maximum trace is permanently saved, | |
139 | * for later retrieval via /debugfs/tracing/latency_trace) | |
140 | */ | |
e309b41d | 141 | static void |
bc0c38d1 SR |
142 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
143 | { | |
144 | struct trace_array_cpu *data = tr->data[cpu]; | |
145 | ||
146 | max_tr.cpu = cpu; | |
147 | max_tr.time_start = data->preempt_timestamp; | |
148 | ||
149 | data = max_tr.data[cpu]; | |
150 | data->saved_latency = tracing_max_latency; | |
151 | ||
152 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); | |
153 | data->pid = tsk->pid; | |
154 | data->uid = tsk->uid; | |
155 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; | |
156 | data->policy = tsk->policy; | |
157 | data->rt_priority = tsk->rt_priority; | |
158 | ||
159 | /* record this tasks comm */ | |
160 | tracing_record_cmdline(current); | |
161 | } | |
162 | ||
c7aafc54 IM |
163 | void check_pages(struct trace_array_cpu *data) |
164 | { | |
165 | struct page *page, *tmp; | |
166 | ||
167 | BUG_ON(data->trace_pages.next->prev != &data->trace_pages); | |
168 | BUG_ON(data->trace_pages.prev->next != &data->trace_pages); | |
169 | ||
170 | list_for_each_entry_safe(page, tmp, &data->trace_pages, lru) { | |
171 | BUG_ON(page->lru.next->prev != &page->lru); | |
172 | BUG_ON(page->lru.prev->next != &page->lru); | |
173 | } | |
174 | } | |
175 | ||
176 | void *head_page(struct trace_array_cpu *data) | |
177 | { | |
178 | struct page *page; | |
179 | ||
180 | check_pages(data); | |
181 | if (list_empty(&data->trace_pages)) | |
182 | return NULL; | |
183 | ||
184 | page = list_entry(data->trace_pages.next, struct page, lru); | |
185 | BUG_ON(&page->lru == &data->trace_pages); | |
186 | ||
187 | return page_address(page); | |
188 | } | |
189 | ||
72829bc3 | 190 | int |
214023c3 SR |
191 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
192 | { | |
193 | int len = (PAGE_SIZE - 1) - s->len; | |
194 | va_list ap; | |
b3806b43 | 195 | int ret; |
214023c3 SR |
196 | |
197 | if (!len) | |
198 | return 0; | |
199 | ||
200 | va_start(ap, fmt); | |
b3806b43 | 201 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
214023c3 SR |
202 | va_end(ap); |
203 | ||
b3806b43 | 204 | /* If we can't write it all, don't bother writing anything */ |
72829bc3 | 205 | if (ret >= len) |
b3806b43 SR |
206 | return 0; |
207 | ||
208 | s->len += ret; | |
214023c3 SR |
209 | |
210 | return len; | |
211 | } | |
212 | ||
e309b41d | 213 | static int |
214023c3 SR |
214 | trace_seq_puts(struct trace_seq *s, const char *str) |
215 | { | |
216 | int len = strlen(str); | |
217 | ||
218 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
b3806b43 | 219 | return 0; |
214023c3 SR |
220 | |
221 | memcpy(s->buffer + s->len, str, len); | |
222 | s->len += len; | |
223 | ||
224 | return len; | |
225 | } | |
226 | ||
e309b41d | 227 | static int |
214023c3 SR |
228 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
229 | { | |
230 | if (s->len >= (PAGE_SIZE - 1)) | |
231 | return 0; | |
232 | ||
233 | s->buffer[s->len++] = c; | |
234 | ||
235 | return 1; | |
236 | } | |
237 | ||
e309b41d | 238 | static int |
cb0f12aa IM |
239 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
240 | { | |
241 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
242 | return 0; | |
243 | ||
244 | memcpy(s->buffer + s->len, mem, len); | |
245 | s->len += len; | |
246 | ||
247 | return len; | |
248 | } | |
249 | ||
5e3ca0ec | 250 | #define HEX_CHARS 17 |
93dcc6ea | 251 | static const char hex2asc[] = "0123456789abcdef"; |
5e3ca0ec | 252 | |
e309b41d | 253 | static int |
5e3ca0ec IM |
254 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
255 | { | |
256 | unsigned char hex[HEX_CHARS]; | |
93dcc6ea | 257 | unsigned char *data = mem; |
5e3ca0ec IM |
258 | unsigned char byte; |
259 | int i, j; | |
260 | ||
261 | BUG_ON(len >= HEX_CHARS); | |
262 | ||
5e3ca0ec IM |
263 | #ifdef __BIG_ENDIAN |
264 | for (i = 0, j = 0; i < len; i++) { | |
265 | #else | |
266 | for (i = len-1, j = 0; i >= 0; i--) { | |
267 | #endif | |
268 | byte = data[i]; | |
269 | ||
93dcc6ea TG |
270 | hex[j++] = hex2asc[byte & 0x0f]; |
271 | hex[j++] = hex2asc[byte >> 4]; | |
5e3ca0ec | 272 | } |
93dcc6ea | 273 | hex[j++] = ' '; |
5e3ca0ec IM |
274 | |
275 | return trace_seq_putmem(s, hex, j); | |
276 | } | |
277 | ||
e309b41d | 278 | static void |
214023c3 SR |
279 | trace_seq_reset(struct trace_seq *s) |
280 | { | |
281 | s->len = 0; | |
282 | } | |
283 | ||
e309b41d | 284 | static void |
214023c3 SR |
285 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
286 | { | |
287 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; | |
288 | ||
289 | s->buffer[len] = 0; | |
290 | seq_puts(m, s->buffer); | |
291 | ||
292 | trace_seq_reset(s); | |
293 | } | |
294 | ||
e309b41d | 295 | static void |
c7aafc54 IM |
296 | flip_trace(struct trace_array_cpu *tr1, struct trace_array_cpu *tr2) |
297 | { | |
298 | struct list_head flip_pages; | |
299 | ||
300 | INIT_LIST_HEAD(&flip_pages); | |
301 | ||
93a588f4 | 302 | memcpy(&tr1->trace_head_idx, &tr2->trace_head_idx, |
c7aafc54 | 303 | sizeof(struct trace_array_cpu) - |
93a588f4 | 304 | offsetof(struct trace_array_cpu, trace_head_idx)); |
c7aafc54 IM |
305 | |
306 | check_pages(tr1); | |
307 | check_pages(tr2); | |
308 | list_splice_init(&tr1->trace_pages, &flip_pages); | |
309 | list_splice_init(&tr2->trace_pages, &tr1->trace_pages); | |
310 | list_splice_init(&flip_pages, &tr2->trace_pages); | |
311 | BUG_ON(!list_empty(&flip_pages)); | |
312 | check_pages(tr1); | |
313 | check_pages(tr2); | |
314 | } | |
315 | ||
e309b41d | 316 | void |
bc0c38d1 SR |
317 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
318 | { | |
319 | struct trace_array_cpu *data; | |
bc0c38d1 SR |
320 | int i; |
321 | ||
4c11d7ae | 322 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 323 | __raw_spin_lock(&ftrace_max_lock); |
bc0c38d1 SR |
324 | /* clear out all the previous traces */ |
325 | for_each_possible_cpu(i) { | |
326 | data = tr->data[i]; | |
c7aafc54 | 327 | flip_trace(max_tr.data[i], data); |
89b2f978 | 328 | tracing_reset(data); |
bc0c38d1 SR |
329 | } |
330 | ||
331 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 332 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
333 | } |
334 | ||
335 | /** | |
336 | * update_max_tr_single - only copy one trace over, and reset the rest | |
337 | * @tr - tracer | |
338 | * @tsk - task with the latency | |
339 | * @cpu - the cpu of the buffer to copy. | |
340 | */ | |
e309b41d | 341 | void |
bc0c38d1 SR |
342 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
343 | { | |
344 | struct trace_array_cpu *data = tr->data[cpu]; | |
bc0c38d1 SR |
345 | int i; |
346 | ||
4c11d7ae | 347 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 348 | __raw_spin_lock(&ftrace_max_lock); |
bc0c38d1 SR |
349 | for_each_possible_cpu(i) |
350 | tracing_reset(max_tr.data[i]); | |
351 | ||
c7aafc54 | 352 | flip_trace(max_tr.data[cpu], data); |
89b2f978 | 353 | tracing_reset(data); |
bc0c38d1 SR |
354 | |
355 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 356 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
357 | } |
358 | ||
359 | int register_tracer(struct tracer *type) | |
360 | { | |
361 | struct tracer *t; | |
362 | int len; | |
363 | int ret = 0; | |
364 | ||
365 | if (!type->name) { | |
366 | pr_info("Tracer must have a name\n"); | |
367 | return -1; | |
368 | } | |
369 | ||
370 | mutex_lock(&trace_types_lock); | |
371 | for (t = trace_types; t; t = t->next) { | |
372 | if (strcmp(type->name, t->name) == 0) { | |
373 | /* already found */ | |
374 | pr_info("Trace %s already registered\n", | |
375 | type->name); | |
376 | ret = -1; | |
377 | goto out; | |
378 | } | |
379 | } | |
380 | ||
60a11774 SR |
381 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
382 | if (type->selftest) { | |
383 | struct tracer *saved_tracer = current_trace; | |
384 | struct trace_array_cpu *data; | |
385 | struct trace_array *tr = &global_trace; | |
386 | int saved_ctrl = tr->ctrl; | |
387 | int i; | |
388 | /* | |
389 | * Run a selftest on this tracer. | |
390 | * Here we reset the trace buffer, and set the current | |
391 | * tracer to be this tracer. The tracer can then run some | |
392 | * internal tracing to verify that everything is in order. | |
393 | * If we fail, we do not register this tracer. | |
394 | */ | |
395 | for_each_possible_cpu(i) { | |
60a11774 | 396 | data = tr->data[i]; |
c7aafc54 IM |
397 | if (!head_page(data)) |
398 | continue; | |
60a11774 SR |
399 | tracing_reset(data); |
400 | } | |
401 | current_trace = type; | |
402 | tr->ctrl = 0; | |
403 | /* the test is responsible for initializing and enabling */ | |
404 | pr_info("Testing tracer %s: ", type->name); | |
405 | ret = type->selftest(type, tr); | |
406 | /* the test is responsible for resetting too */ | |
407 | current_trace = saved_tracer; | |
408 | tr->ctrl = saved_ctrl; | |
409 | if (ret) { | |
410 | printk(KERN_CONT "FAILED!\n"); | |
411 | goto out; | |
412 | } | |
1d4db00a SR |
413 | /* Only reset on passing, to avoid touching corrupted buffers */ |
414 | for_each_possible_cpu(i) { | |
415 | data = tr->data[i]; | |
416 | if (!head_page(data)) | |
417 | continue; | |
418 | tracing_reset(data); | |
419 | } | |
60a11774 SR |
420 | printk(KERN_CONT "PASSED\n"); |
421 | } | |
422 | #endif | |
423 | ||
bc0c38d1 SR |
424 | type->next = trace_types; |
425 | trace_types = type; | |
426 | len = strlen(type->name); | |
427 | if (len > max_tracer_type_len) | |
428 | max_tracer_type_len = len; | |
60a11774 | 429 | |
bc0c38d1 SR |
430 | out: |
431 | mutex_unlock(&trace_types_lock); | |
432 | ||
433 | return ret; | |
434 | } | |
435 | ||
436 | void unregister_tracer(struct tracer *type) | |
437 | { | |
438 | struct tracer **t; | |
439 | int len; | |
440 | ||
441 | mutex_lock(&trace_types_lock); | |
442 | for (t = &trace_types; *t; t = &(*t)->next) { | |
443 | if (*t == type) | |
444 | goto found; | |
445 | } | |
446 | pr_info("Trace %s not registered\n", type->name); | |
447 | goto out; | |
448 | ||
449 | found: | |
450 | *t = (*t)->next; | |
451 | if (strlen(type->name) != max_tracer_type_len) | |
452 | goto out; | |
453 | ||
454 | max_tracer_type_len = 0; | |
455 | for (t = &trace_types; *t; t = &(*t)->next) { | |
456 | len = strlen((*t)->name); | |
457 | if (len > max_tracer_type_len) | |
458 | max_tracer_type_len = len; | |
459 | } | |
460 | out: | |
461 | mutex_unlock(&trace_types_lock); | |
462 | } | |
463 | ||
e309b41d | 464 | void tracing_reset(struct trace_array_cpu *data) |
bc0c38d1 SR |
465 | { |
466 | data->trace_idx = 0; | |
93a588f4 SR |
467 | data->trace_head = data->trace_tail = head_page(data); |
468 | data->trace_head_idx = 0; | |
469 | data->trace_tail_idx = 0; | |
bc0c38d1 SR |
470 | } |
471 | ||
bc0c38d1 SR |
472 | #define SAVED_CMDLINES 128 |
473 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; | |
474 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; | |
475 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; | |
476 | static int cmdline_idx; | |
477 | static DEFINE_SPINLOCK(trace_cmdline_lock); | |
478 | atomic_t trace_record_cmdline_disabled; | |
479 | ||
480 | static void trace_init_cmdlines(void) | |
481 | { | |
482 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); | |
483 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); | |
484 | cmdline_idx = 0; | |
485 | } | |
486 | ||
e309b41d | 487 | void trace_stop_cmdline_recording(void); |
bc0c38d1 | 488 | |
e309b41d | 489 | static void trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
490 | { |
491 | unsigned map; | |
492 | unsigned idx; | |
493 | ||
494 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
495 | return; | |
496 | ||
497 | /* | |
498 | * It's not the end of the world if we don't get | |
499 | * the lock, but we also don't want to spin | |
500 | * nor do we want to disable interrupts, | |
501 | * so if we miss here, then better luck next time. | |
502 | */ | |
503 | if (!spin_trylock(&trace_cmdline_lock)) | |
504 | return; | |
505 | ||
506 | idx = map_pid_to_cmdline[tsk->pid]; | |
507 | if (idx >= SAVED_CMDLINES) { | |
508 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; | |
509 | ||
510 | map = map_cmdline_to_pid[idx]; | |
511 | if (map <= PID_MAX_DEFAULT) | |
512 | map_pid_to_cmdline[map] = (unsigned)-1; | |
513 | ||
514 | map_pid_to_cmdline[tsk->pid] = idx; | |
515 | ||
516 | cmdline_idx = idx; | |
517 | } | |
518 | ||
519 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); | |
520 | ||
521 | spin_unlock(&trace_cmdline_lock); | |
522 | } | |
523 | ||
e309b41d | 524 | static char *trace_find_cmdline(int pid) |
bc0c38d1 SR |
525 | { |
526 | char *cmdline = "<...>"; | |
527 | unsigned map; | |
528 | ||
529 | if (!pid) | |
530 | return "<idle>"; | |
531 | ||
532 | if (pid > PID_MAX_DEFAULT) | |
533 | goto out; | |
534 | ||
535 | map = map_pid_to_cmdline[pid]; | |
536 | if (map >= SAVED_CMDLINES) | |
537 | goto out; | |
538 | ||
539 | cmdline = saved_cmdlines[map]; | |
540 | ||
541 | out: | |
542 | return cmdline; | |
543 | } | |
544 | ||
e309b41d | 545 | void tracing_record_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
546 | { |
547 | if (atomic_read(&trace_record_cmdline_disabled)) | |
548 | return; | |
549 | ||
550 | trace_save_cmdline(tsk); | |
551 | } | |
552 | ||
e309b41d | 553 | static inline struct list_head * |
93a588f4 SR |
554 | trace_next_list(struct trace_array_cpu *data, struct list_head *next) |
555 | { | |
556 | /* | |
557 | * Roundrobin - but skip the head (which is not a real page): | |
558 | */ | |
559 | next = next->next; | |
560 | if (unlikely(next == &data->trace_pages)) | |
561 | next = next->next; | |
562 | BUG_ON(next == &data->trace_pages); | |
563 | ||
564 | return next; | |
565 | } | |
566 | ||
e309b41d | 567 | static inline void * |
93a588f4 SR |
568 | trace_next_page(struct trace_array_cpu *data, void *addr) |
569 | { | |
570 | struct list_head *next; | |
571 | struct page *page; | |
572 | ||
573 | page = virt_to_page(addr); | |
574 | ||
575 | next = trace_next_list(data, &page->lru); | |
576 | page = list_entry(next, struct page, lru); | |
577 | ||
578 | return page_address(page); | |
579 | } | |
580 | ||
e309b41d | 581 | static inline struct trace_entry * |
c7aafc54 | 582 | tracing_get_trace_entry(struct trace_array *tr, struct trace_array_cpu *data) |
bc0c38d1 SR |
583 | { |
584 | unsigned long idx, idx_next; | |
585 | struct trace_entry *entry; | |
586 | ||
4c11d7ae | 587 | data->trace_idx++; |
93a588f4 | 588 | idx = data->trace_head_idx; |
bc0c38d1 SR |
589 | idx_next = idx + 1; |
590 | ||
c7aafc54 IM |
591 | BUG_ON(idx * TRACE_ENTRY_SIZE >= PAGE_SIZE); |
592 | ||
93a588f4 | 593 | entry = data->trace_head + idx * TRACE_ENTRY_SIZE; |
4c11d7ae SR |
594 | |
595 | if (unlikely(idx_next >= ENTRIES_PER_PAGE)) { | |
93a588f4 | 596 | data->trace_head = trace_next_page(data, data->trace_head); |
bc0c38d1 SR |
597 | idx_next = 0; |
598 | } | |
599 | ||
93a588f4 SR |
600 | if (data->trace_head == data->trace_tail && |
601 | idx_next == data->trace_tail_idx) { | |
602 | /* overrun */ | |
603 | data->trace_tail_idx++; | |
604 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { | |
605 | data->trace_tail = | |
606 | trace_next_page(data, data->trace_tail); | |
607 | data->trace_tail_idx = 0; | |
608 | } | |
609 | } | |
610 | ||
611 | data->trace_head_idx = idx_next; | |
bc0c38d1 SR |
612 | |
613 | return entry; | |
614 | } | |
615 | ||
e309b41d | 616 | static inline void |
c7aafc54 | 617 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags) |
bc0c38d1 SR |
618 | { |
619 | struct task_struct *tsk = current; | |
620 | unsigned long pc; | |
621 | ||
622 | pc = preempt_count(); | |
623 | ||
c7aafc54 | 624 | entry->preempt_count = pc & 0xff; |
72829bc3 | 625 | entry->pid = (tsk) ? tsk->pid : 0; |
750ed1a4 | 626 | entry->t = ftrace_now(raw_smp_processor_id()); |
bc0c38d1 SR |
627 | entry->flags = (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
628 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | | |
629 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | | |
630 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); | |
631 | } | |
632 | ||
e309b41d | 633 | void |
6fb44b71 SR |
634 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
635 | unsigned long ip, unsigned long parent_ip, unsigned long flags) | |
bc0c38d1 SR |
636 | { |
637 | struct trace_entry *entry; | |
dcb6308f | 638 | unsigned long irq_flags; |
bc0c38d1 | 639 | |
92205c23 SR |
640 | raw_local_irq_save(irq_flags); |
641 | __raw_spin_lock(&data->lock); | |
c7aafc54 | 642 | entry = tracing_get_trace_entry(tr, data); |
bc0c38d1 | 643 | tracing_generic_entry_update(entry, flags); |
c7aafc54 IM |
644 | entry->type = TRACE_FN; |
645 | entry->fn.ip = ip; | |
646 | entry->fn.parent_ip = parent_ip; | |
92205c23 SR |
647 | __raw_spin_unlock(&data->lock); |
648 | raw_local_irq_restore(irq_flags); | |
bc0c38d1 SR |
649 | } |
650 | ||
e309b41d | 651 | void |
2e0f5761 IM |
652 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
653 | unsigned long ip, unsigned long parent_ip, unsigned long flags) | |
654 | { | |
655 | if (likely(!atomic_read(&data->disabled))) | |
6fb44b71 | 656 | trace_function(tr, data, ip, parent_ip, flags); |
2e0f5761 IM |
657 | } |
658 | ||
e309b41d | 659 | void |
4e655519 IM |
660 | __trace_special(void *__tr, void *__data, |
661 | unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
f0a920d5 | 662 | { |
4e655519 IM |
663 | struct trace_array_cpu *data = __data; |
664 | struct trace_array *tr = __tr; | |
f0a920d5 | 665 | struct trace_entry *entry; |
dcb6308f | 666 | unsigned long irq_flags; |
f0a920d5 | 667 | |
92205c23 SR |
668 | raw_local_irq_save(irq_flags); |
669 | __raw_spin_lock(&data->lock); | |
f0a920d5 IM |
670 | entry = tracing_get_trace_entry(tr, data); |
671 | tracing_generic_entry_update(entry, 0); | |
672 | entry->type = TRACE_SPECIAL; | |
673 | entry->special.arg1 = arg1; | |
674 | entry->special.arg2 = arg2; | |
675 | entry->special.arg3 = arg3; | |
92205c23 SR |
676 | __raw_spin_unlock(&data->lock); |
677 | raw_local_irq_restore(irq_flags); | |
017730c1 IM |
678 | |
679 | trace_wake_up(); | |
86387f7e IM |
680 | } |
681 | ||
682 | void __trace_stack(struct trace_array *tr, | |
683 | struct trace_array_cpu *data, | |
684 | unsigned long flags, | |
685 | int skip) | |
686 | { | |
687 | struct trace_entry *entry; | |
688 | struct stack_trace trace; | |
689 | ||
690 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) | |
691 | return; | |
692 | ||
693 | entry = tracing_get_trace_entry(tr, data); | |
694 | tracing_generic_entry_update(entry, flags); | |
695 | entry->type = TRACE_STACK; | |
696 | ||
697 | memset(&entry->stack, 0, sizeof(entry->stack)); | |
698 | ||
699 | trace.nr_entries = 0; | |
700 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
701 | trace.skip = skip; | |
702 | trace.entries = entry->stack.caller; | |
703 | ||
704 | save_stack_trace(&trace); | |
f0a920d5 IM |
705 | } |
706 | ||
e309b41d | 707 | void |
bc0c38d1 SR |
708 | tracing_sched_switch_trace(struct trace_array *tr, |
709 | struct trace_array_cpu *data, | |
86387f7e IM |
710 | struct task_struct *prev, |
711 | struct task_struct *next, | |
bc0c38d1 SR |
712 | unsigned long flags) |
713 | { | |
714 | struct trace_entry *entry; | |
dcb6308f | 715 | unsigned long irq_flags; |
bc0c38d1 | 716 | |
92205c23 SR |
717 | raw_local_irq_save(irq_flags); |
718 | __raw_spin_lock(&data->lock); | |
c7aafc54 | 719 | entry = tracing_get_trace_entry(tr, data); |
bc0c38d1 SR |
720 | tracing_generic_entry_update(entry, flags); |
721 | entry->type = TRACE_CTX; | |
722 | entry->ctx.prev_pid = prev->pid; | |
723 | entry->ctx.prev_prio = prev->prio; | |
724 | entry->ctx.prev_state = prev->state; | |
725 | entry->ctx.next_pid = next->pid; | |
726 | entry->ctx.next_prio = next->prio; | |
bac524d3 | 727 | entry->ctx.next_state = next->state; |
86387f7e | 728 | __trace_stack(tr, data, flags, 4); |
92205c23 SR |
729 | __raw_spin_unlock(&data->lock); |
730 | raw_local_irq_restore(irq_flags); | |
bc0c38d1 SR |
731 | } |
732 | ||
57422797 IM |
733 | void |
734 | tracing_sched_wakeup_trace(struct trace_array *tr, | |
735 | struct trace_array_cpu *data, | |
86387f7e IM |
736 | struct task_struct *wakee, |
737 | struct task_struct *curr, | |
57422797 IM |
738 | unsigned long flags) |
739 | { | |
740 | struct trace_entry *entry; | |
741 | unsigned long irq_flags; | |
742 | ||
92205c23 SR |
743 | raw_local_irq_save(irq_flags); |
744 | __raw_spin_lock(&data->lock); | |
57422797 IM |
745 | entry = tracing_get_trace_entry(tr, data); |
746 | tracing_generic_entry_update(entry, flags); | |
747 | entry->type = TRACE_WAKE; | |
748 | entry->ctx.prev_pid = curr->pid; | |
749 | entry->ctx.prev_prio = curr->prio; | |
750 | entry->ctx.prev_state = curr->state; | |
751 | entry->ctx.next_pid = wakee->pid; | |
752 | entry->ctx.next_prio = wakee->prio; | |
bac524d3 | 753 | entry->ctx.next_state = wakee->state; |
86387f7e | 754 | __trace_stack(tr, data, flags, 5); |
92205c23 SR |
755 | __raw_spin_unlock(&data->lock); |
756 | raw_local_irq_restore(irq_flags); | |
017730c1 IM |
757 | |
758 | trace_wake_up(); | |
57422797 IM |
759 | } |
760 | ||
2e0f5761 | 761 | #ifdef CONFIG_FTRACE |
e309b41d | 762 | static void |
2e0f5761 IM |
763 | function_trace_call(unsigned long ip, unsigned long parent_ip) |
764 | { | |
765 | struct trace_array *tr = &global_trace; | |
766 | struct trace_array_cpu *data; | |
767 | unsigned long flags; | |
768 | long disabled; | |
769 | int cpu; | |
770 | ||
771 | if (unlikely(!tracer_enabled)) | |
772 | return; | |
773 | ||
774 | local_irq_save(flags); | |
775 | cpu = raw_smp_processor_id(); | |
776 | data = tr->data[cpu]; | |
777 | disabled = atomic_inc_return(&data->disabled); | |
778 | ||
779 | if (likely(disabled == 1)) | |
6fb44b71 | 780 | trace_function(tr, data, ip, parent_ip, flags); |
2e0f5761 IM |
781 | |
782 | atomic_dec(&data->disabled); | |
783 | local_irq_restore(flags); | |
784 | } | |
785 | ||
786 | static struct ftrace_ops trace_ops __read_mostly = | |
787 | { | |
788 | .func = function_trace_call, | |
789 | }; | |
790 | ||
e309b41d | 791 | void tracing_start_function_trace(void) |
2e0f5761 IM |
792 | { |
793 | register_ftrace_function(&trace_ops); | |
794 | } | |
795 | ||
e309b41d | 796 | void tracing_stop_function_trace(void) |
2e0f5761 IM |
797 | { |
798 | unregister_ftrace_function(&trace_ops); | |
799 | } | |
800 | #endif | |
801 | ||
bc0c38d1 SR |
802 | enum trace_file_type { |
803 | TRACE_FILE_LAT_FMT = 1, | |
804 | }; | |
805 | ||
806 | static struct trace_entry * | |
4c11d7ae SR |
807 | trace_entry_idx(struct trace_array *tr, struct trace_array_cpu *data, |
808 | struct trace_iterator *iter, int cpu) | |
bc0c38d1 | 809 | { |
4c11d7ae SR |
810 | struct page *page; |
811 | struct trace_entry *array; | |
bc0c38d1 | 812 | |
4c11d7ae | 813 | if (iter->next_idx[cpu] >= tr->entries || |
b3806b43 SR |
814 | iter->next_idx[cpu] >= data->trace_idx || |
815 | (data->trace_head == data->trace_tail && | |
816 | data->trace_head_idx == data->trace_tail_idx)) | |
bc0c38d1 SR |
817 | return NULL; |
818 | ||
4c11d7ae | 819 | if (!iter->next_page[cpu]) { |
93a588f4 SR |
820 | /* Initialize the iterator for this cpu trace buffer */ |
821 | WARN_ON(!data->trace_tail); | |
822 | page = virt_to_page(data->trace_tail); | |
823 | iter->next_page[cpu] = &page->lru; | |
824 | iter->next_page_idx[cpu] = data->trace_tail_idx; | |
4c11d7ae | 825 | } |
bc0c38d1 | 826 | |
4c11d7ae | 827 | page = list_entry(iter->next_page[cpu], struct page, lru); |
c7aafc54 IM |
828 | BUG_ON(&data->trace_pages == &page->lru); |
829 | ||
4c11d7ae SR |
830 | array = page_address(page); |
831 | ||
93a588f4 | 832 | WARN_ON(iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE); |
4c11d7ae | 833 | return &array[iter->next_page_idx[cpu]]; |
bc0c38d1 SR |
834 | } |
835 | ||
e309b41d | 836 | static struct trace_entry * |
bc0c38d1 SR |
837 | find_next_entry(struct trace_iterator *iter, int *ent_cpu) |
838 | { | |
839 | struct trace_array *tr = iter->tr; | |
840 | struct trace_entry *ent, *next = NULL; | |
841 | int next_cpu = -1; | |
842 | int cpu; | |
843 | ||
844 | for_each_possible_cpu(cpu) { | |
c7aafc54 | 845 | if (!head_page(tr->data[cpu])) |
bc0c38d1 | 846 | continue; |
4c11d7ae | 847 | ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); |
cdd31cd2 IM |
848 | /* |
849 | * Pick the entry with the smallest timestamp: | |
850 | */ | |
851 | if (ent && (!next || ent->t < next->t)) { | |
bc0c38d1 SR |
852 | next = ent; |
853 | next_cpu = cpu; | |
854 | } | |
855 | } | |
856 | ||
857 | if (ent_cpu) | |
858 | *ent_cpu = next_cpu; | |
859 | ||
860 | return next; | |
861 | } | |
862 | ||
e309b41d | 863 | static void trace_iterator_increment(struct trace_iterator *iter) |
bc0c38d1 | 864 | { |
b3806b43 SR |
865 | iter->idx++; |
866 | iter->next_idx[iter->cpu]++; | |
867 | iter->next_page_idx[iter->cpu]++; | |
8c523a9d | 868 | |
b3806b43 SR |
869 | if (iter->next_page_idx[iter->cpu] >= ENTRIES_PER_PAGE) { |
870 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; | |
bc0c38d1 | 871 | |
b3806b43 SR |
872 | iter->next_page_idx[iter->cpu] = 0; |
873 | iter->next_page[iter->cpu] = | |
874 | trace_next_list(data, iter->next_page[iter->cpu]); | |
875 | } | |
876 | } | |
bc0c38d1 | 877 | |
e309b41d | 878 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 SR |
879 | { |
880 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; | |
881 | ||
882 | data->trace_tail_idx++; | |
883 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { | |
884 | data->trace_tail = trace_next_page(data, data->trace_tail); | |
885 | data->trace_tail_idx = 0; | |
886 | } | |
4e3c3333 | 887 | |
b3806b43 SR |
888 | /* Check if we empty it, then reset the index */ |
889 | if (data->trace_head == data->trace_tail && | |
890 | data->trace_head_idx == data->trace_tail_idx) | |
891 | data->trace_idx = 0; | |
b3806b43 SR |
892 | } |
893 | ||
e309b41d | 894 | static void *find_next_entry_inc(struct trace_iterator *iter) |
b3806b43 SR |
895 | { |
896 | struct trace_entry *next; | |
897 | int next_cpu = -1; | |
898 | ||
899 | next = find_next_entry(iter, &next_cpu); | |
93a588f4 | 900 | |
4e3c3333 IM |
901 | iter->prev_ent = iter->ent; |
902 | iter->prev_cpu = iter->cpu; | |
903 | ||
bc0c38d1 SR |
904 | iter->ent = next; |
905 | iter->cpu = next_cpu; | |
906 | ||
b3806b43 SR |
907 | if (next) |
908 | trace_iterator_increment(iter); | |
909 | ||
bc0c38d1 SR |
910 | return next ? iter : NULL; |
911 | } | |
912 | ||
e309b41d | 913 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
914 | { |
915 | struct trace_iterator *iter = m->private; | |
bc0c38d1 SR |
916 | void *last_ent = iter->ent; |
917 | int i = (int)*pos; | |
4e3c3333 | 918 | void *ent; |
bc0c38d1 SR |
919 | |
920 | (*pos)++; | |
921 | ||
922 | /* can't go backwards */ | |
923 | if (iter->idx > i) | |
924 | return NULL; | |
925 | ||
926 | if (iter->idx < 0) | |
927 | ent = find_next_entry_inc(iter); | |
928 | else | |
929 | ent = iter; | |
930 | ||
931 | while (ent && iter->idx < i) | |
932 | ent = find_next_entry_inc(iter); | |
933 | ||
934 | iter->pos = *pos; | |
935 | ||
936 | if (last_ent && !ent) | |
937 | seq_puts(m, "\n\nvim:ft=help\n"); | |
938 | ||
939 | return ent; | |
940 | } | |
941 | ||
942 | static void *s_start(struct seq_file *m, loff_t *pos) | |
943 | { | |
944 | struct trace_iterator *iter = m->private; | |
945 | void *p = NULL; | |
946 | loff_t l = 0; | |
947 | int i; | |
948 | ||
949 | mutex_lock(&trace_types_lock); | |
950 | ||
d15f57f2 SR |
951 | if (!current_trace || current_trace != iter->trace) { |
952 | mutex_unlock(&trace_types_lock); | |
bc0c38d1 | 953 | return NULL; |
d15f57f2 | 954 | } |
bc0c38d1 SR |
955 | |
956 | atomic_inc(&trace_record_cmdline_disabled); | |
957 | ||
958 | /* let the tracer grab locks here if needed */ | |
959 | if (current_trace->start) | |
960 | current_trace->start(iter); | |
961 | ||
962 | if (*pos != iter->pos) { | |
963 | iter->ent = NULL; | |
964 | iter->cpu = 0; | |
965 | iter->idx = -1; | |
4e3c3333 IM |
966 | iter->prev_ent = NULL; |
967 | iter->prev_cpu = -1; | |
bc0c38d1 | 968 | |
4c11d7ae | 969 | for_each_possible_cpu(i) { |
bc0c38d1 | 970 | iter->next_idx[i] = 0; |
4c11d7ae SR |
971 | iter->next_page[i] = NULL; |
972 | } | |
bc0c38d1 SR |
973 | |
974 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) | |
975 | ; | |
976 | ||
977 | } else { | |
4c11d7ae | 978 | l = *pos - 1; |
bc0c38d1 SR |
979 | p = s_next(m, p, &l); |
980 | } | |
981 | ||
982 | return p; | |
983 | } | |
984 | ||
985 | static void s_stop(struct seq_file *m, void *p) | |
986 | { | |
987 | struct trace_iterator *iter = m->private; | |
988 | ||
989 | atomic_dec(&trace_record_cmdline_disabled); | |
990 | ||
991 | /* let the tracer release locks here if needed */ | |
992 | if (current_trace && current_trace == iter->trace && iter->trace->stop) | |
993 | iter->trace->stop(iter); | |
994 | ||
995 | mutex_unlock(&trace_types_lock); | |
996 | } | |
997 | ||
b3806b43 | 998 | static int |
214023c3 | 999 | seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) |
bc0c38d1 SR |
1000 | { |
1001 | #ifdef CONFIG_KALLSYMS | |
1002 | char str[KSYM_SYMBOL_LEN]; | |
1003 | ||
1004 | kallsyms_lookup(address, NULL, NULL, NULL, str); | |
1005 | ||
b3806b43 | 1006 | return trace_seq_printf(s, fmt, str); |
bc0c38d1 | 1007 | #endif |
b3806b43 | 1008 | return 1; |
bc0c38d1 SR |
1009 | } |
1010 | ||
b3806b43 | 1011 | static int |
214023c3 SR |
1012 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
1013 | unsigned long address) | |
bc0c38d1 SR |
1014 | { |
1015 | #ifdef CONFIG_KALLSYMS | |
1016 | char str[KSYM_SYMBOL_LEN]; | |
1017 | ||
1018 | sprint_symbol(str, address); | |
b3806b43 | 1019 | return trace_seq_printf(s, fmt, str); |
bc0c38d1 | 1020 | #endif |
b3806b43 | 1021 | return 1; |
bc0c38d1 SR |
1022 | } |
1023 | ||
1024 | #ifndef CONFIG_64BIT | |
1025 | # define IP_FMT "%08lx" | |
1026 | #else | |
1027 | # define IP_FMT "%016lx" | |
1028 | #endif | |
1029 | ||
e309b41d | 1030 | static int |
214023c3 | 1031 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) |
bc0c38d1 | 1032 | { |
b3806b43 SR |
1033 | int ret; |
1034 | ||
1035 | if (!ip) | |
1036 | return trace_seq_printf(s, "0"); | |
bc0c38d1 SR |
1037 | |
1038 | if (sym_flags & TRACE_ITER_SYM_OFFSET) | |
b3806b43 | 1039 | ret = seq_print_sym_offset(s, "%s", ip); |
bc0c38d1 | 1040 | else |
b3806b43 SR |
1041 | ret = seq_print_sym_short(s, "%s", ip); |
1042 | ||
1043 | if (!ret) | |
1044 | return 0; | |
bc0c38d1 SR |
1045 | |
1046 | if (sym_flags & TRACE_ITER_SYM_ADDR) | |
b3806b43 SR |
1047 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
1048 | return ret; | |
bc0c38d1 SR |
1049 | } |
1050 | ||
e309b41d | 1051 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 SR |
1052 | { |
1053 | seq_puts(m, "# _------=> CPU# \n"); | |
1054 | seq_puts(m, "# / _-----=> irqs-off \n"); | |
1055 | seq_puts(m, "# | / _----=> need-resched \n"); | |
1056 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); | |
1057 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); | |
1058 | seq_puts(m, "# |||| / \n"); | |
1059 | seq_puts(m, "# ||||| delay \n"); | |
1060 | seq_puts(m, "# cmd pid ||||| time | caller \n"); | |
1061 | seq_puts(m, "# \\ / ||||| \\ | / \n"); | |
1062 | } | |
1063 | ||
e309b41d | 1064 | static void print_func_help_header(struct seq_file *m) |
bc0c38d1 SR |
1065 | { |
1066 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); | |
1067 | seq_puts(m, "# | | | | |\n"); | |
1068 | } | |
1069 | ||
1070 | ||
e309b41d | 1071 | static void |
bc0c38d1 SR |
1072 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
1073 | { | |
1074 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); | |
1075 | struct trace_array *tr = iter->tr; | |
1076 | struct trace_array_cpu *data = tr->data[tr->cpu]; | |
1077 | struct tracer *type = current_trace; | |
4c11d7ae SR |
1078 | unsigned long total = 0; |
1079 | unsigned long entries = 0; | |
bc0c38d1 SR |
1080 | int cpu; |
1081 | const char *name = "preemption"; | |
1082 | ||
1083 | if (type) | |
1084 | name = type->name; | |
1085 | ||
1086 | for_each_possible_cpu(cpu) { | |
c7aafc54 | 1087 | if (head_page(tr->data[cpu])) { |
4c11d7ae SR |
1088 | total += tr->data[cpu]->trace_idx; |
1089 | if (tr->data[cpu]->trace_idx > tr->entries) | |
bc0c38d1 | 1090 | entries += tr->entries; |
4c11d7ae | 1091 | else |
bc0c38d1 SR |
1092 | entries += tr->data[cpu]->trace_idx; |
1093 | } | |
1094 | } | |
1095 | ||
1096 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", | |
1097 | name, UTS_RELEASE); | |
1098 | seq_puts(m, "-----------------------------------" | |
1099 | "---------------------------------\n"); | |
1100 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" | |
1101 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", | |
57f50be1 | 1102 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 1103 | entries, |
4c11d7ae | 1104 | total, |
bc0c38d1 SR |
1105 | tr->cpu, |
1106 | #if defined(CONFIG_PREEMPT_NONE) | |
1107 | "server", | |
1108 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
1109 | "desktop", | |
1110 | #elif defined(CONFIG_PREEMPT_DESKTOP) | |
1111 | "preempt", | |
1112 | #else | |
1113 | "unknown", | |
1114 | #endif | |
1115 | /* These are reserved for later use */ | |
1116 | 0, 0, 0, 0); | |
1117 | #ifdef CONFIG_SMP | |
1118 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
1119 | #else | |
1120 | seq_puts(m, ")\n"); | |
1121 | #endif | |
1122 | seq_puts(m, " -----------------\n"); | |
1123 | seq_printf(m, " | task: %.16s-%d " | |
1124 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", | |
1125 | data->comm, data->pid, data->uid, data->nice, | |
1126 | data->policy, data->rt_priority); | |
1127 | seq_puts(m, " -----------------\n"); | |
1128 | ||
1129 | if (data->critical_start) { | |
1130 | seq_puts(m, " => started at: "); | |
214023c3 SR |
1131 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
1132 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 | 1133 | seq_puts(m, "\n => ended at: "); |
214023c3 SR |
1134 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
1135 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 SR |
1136 | seq_puts(m, "\n"); |
1137 | } | |
1138 | ||
1139 | seq_puts(m, "\n"); | |
1140 | } | |
1141 | ||
e309b41d | 1142 | static void |
214023c3 | 1143 | lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) |
bc0c38d1 SR |
1144 | { |
1145 | int hardirq, softirq; | |
1146 | char *comm; | |
1147 | ||
1148 | comm = trace_find_cmdline(entry->pid); | |
1149 | ||
214023c3 SR |
1150 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
1151 | trace_seq_printf(s, "%d", cpu); | |
1152 | trace_seq_printf(s, "%c%c", | |
1153 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.', | |
1154 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); | |
bc0c38d1 SR |
1155 | |
1156 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; | |
1157 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; | |
afc2abc0 | 1158 | if (hardirq && softirq) { |
214023c3 | 1159 | trace_seq_putc(s, 'H'); |
afc2abc0 IM |
1160 | } else { |
1161 | if (hardirq) { | |
214023c3 | 1162 | trace_seq_putc(s, 'h'); |
afc2abc0 | 1163 | } else { |
bc0c38d1 | 1164 | if (softirq) |
214023c3 | 1165 | trace_seq_putc(s, 's'); |
bc0c38d1 | 1166 | else |
214023c3 | 1167 | trace_seq_putc(s, '.'); |
bc0c38d1 SR |
1168 | } |
1169 | } | |
1170 | ||
1171 | if (entry->preempt_count) | |
214023c3 | 1172 | trace_seq_printf(s, "%x", entry->preempt_count); |
bc0c38d1 | 1173 | else |
214023c3 | 1174 | trace_seq_puts(s, "."); |
bc0c38d1 SR |
1175 | } |
1176 | ||
1177 | unsigned long preempt_mark_thresh = 100; | |
1178 | ||
e309b41d | 1179 | static void |
214023c3 | 1180 | lat_print_timestamp(struct trace_seq *s, unsigned long long abs_usecs, |
bc0c38d1 SR |
1181 | unsigned long rel_usecs) |
1182 | { | |
214023c3 | 1183 | trace_seq_printf(s, " %4lldus", abs_usecs); |
bc0c38d1 | 1184 | if (rel_usecs > preempt_mark_thresh) |
214023c3 | 1185 | trace_seq_puts(s, "!: "); |
bc0c38d1 | 1186 | else if (rel_usecs > 1) |
214023c3 | 1187 | trace_seq_puts(s, "+: "); |
bc0c38d1 | 1188 | else |
214023c3 | 1189 | trace_seq_puts(s, " : "); |
bc0c38d1 SR |
1190 | } |
1191 | ||
1192 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; | |
1193 | ||
e309b41d | 1194 | static int |
214023c3 | 1195 | print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) |
bc0c38d1 | 1196 | { |
214023c3 | 1197 | struct trace_seq *s = &iter->seq; |
bc0c38d1 SR |
1198 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
1199 | struct trace_entry *next_entry = find_next_entry(iter, NULL); | |
1200 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); | |
1201 | struct trace_entry *entry = iter->ent; | |
1202 | unsigned long abs_usecs; | |
1203 | unsigned long rel_usecs; | |
1204 | char *comm; | |
bac524d3 | 1205 | int S, T; |
86387f7e | 1206 | int i; |
d17d9691 | 1207 | unsigned state; |
bc0c38d1 SR |
1208 | |
1209 | if (!next_entry) | |
1210 | next_entry = entry; | |
1211 | rel_usecs = ns2usecs(next_entry->t - entry->t); | |
1212 | abs_usecs = ns2usecs(entry->t - iter->tr->time_start); | |
1213 | ||
1214 | if (verbose) { | |
1215 | comm = trace_find_cmdline(entry->pid); | |
214023c3 SR |
1216 | trace_seq_printf(s, "%16s %5d %d %d %08x %08x [%08lx]" |
1217 | " %ld.%03ldms (+%ld.%03ldms): ", | |
1218 | comm, | |
1219 | entry->pid, cpu, entry->flags, | |
1220 | entry->preempt_count, trace_idx, | |
1221 | ns2usecs(entry->t), | |
1222 | abs_usecs/1000, | |
1223 | abs_usecs % 1000, rel_usecs/1000, | |
1224 | rel_usecs % 1000); | |
bc0c38d1 | 1225 | } else { |
f29c73fe IM |
1226 | lat_print_generic(s, entry, cpu); |
1227 | lat_print_timestamp(s, abs_usecs, rel_usecs); | |
bc0c38d1 SR |
1228 | } |
1229 | switch (entry->type) { | |
1230 | case TRACE_FN: | |
214023c3 SR |
1231 | seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
1232 | trace_seq_puts(s, " ("); | |
1233 | seq_print_ip_sym(s, entry->fn.parent_ip, sym_flags); | |
1234 | trace_seq_puts(s, ")\n"); | |
bc0c38d1 SR |
1235 | break; |
1236 | case TRACE_CTX: | |
57422797 | 1237 | case TRACE_WAKE: |
bac524d3 PZ |
1238 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
1239 | state_to_char[entry->ctx.next_state] : 'X'; | |
1240 | ||
d17d9691 AG |
1241 | state = entry->ctx.prev_state ? __ffs(entry->ctx.prev_state) + 1 : 0; |
1242 | S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X'; | |
bc0c38d1 | 1243 | comm = trace_find_cmdline(entry->ctx.next_pid); |
bac524d3 | 1244 | trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d:%c %s\n", |
214023c3 SR |
1245 | entry->ctx.prev_pid, |
1246 | entry->ctx.prev_prio, | |
57422797 | 1247 | S, entry->type == TRACE_CTX ? "==>" : " +", |
214023c3 SR |
1248 | entry->ctx.next_pid, |
1249 | entry->ctx.next_prio, | |
bac524d3 | 1250 | T, comm); |
bc0c38d1 | 1251 | break; |
f0a920d5 | 1252 | case TRACE_SPECIAL: |
88a4216c | 1253 | trace_seq_printf(s, "# %ld %ld %ld\n", |
f0a920d5 IM |
1254 | entry->special.arg1, |
1255 | entry->special.arg2, | |
1256 | entry->special.arg3); | |
1257 | break; | |
86387f7e IM |
1258 | case TRACE_STACK: |
1259 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { | |
1260 | if (i) | |
1261 | trace_seq_puts(s, " <= "); | |
1262 | seq_print_ip_sym(s, entry->stack.caller[i], sym_flags); | |
1263 | } | |
1264 | trace_seq_puts(s, "\n"); | |
1265 | break; | |
89b2f978 | 1266 | default: |
214023c3 | 1267 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
bc0c38d1 | 1268 | } |
f9896bf3 | 1269 | return 1; |
bc0c38d1 SR |
1270 | } |
1271 | ||
e309b41d | 1272 | static int print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 1273 | { |
214023c3 | 1274 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1275 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 1276 | struct trace_entry *entry; |
bc0c38d1 SR |
1277 | unsigned long usec_rem; |
1278 | unsigned long long t; | |
1279 | unsigned long secs; | |
1280 | char *comm; | |
b3806b43 | 1281 | int ret; |
bac524d3 | 1282 | int S, T; |
86387f7e | 1283 | int i; |
bc0c38d1 | 1284 | |
4e3c3333 IM |
1285 | entry = iter->ent; |
1286 | ||
bc0c38d1 SR |
1287 | comm = trace_find_cmdline(iter->ent->pid); |
1288 | ||
cdd31cd2 | 1289 | t = ns2usecs(entry->t); |
bc0c38d1 SR |
1290 | usec_rem = do_div(t, 1000000ULL); |
1291 | secs = (unsigned long)t; | |
1292 | ||
f29c73fe IM |
1293 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
1294 | if (!ret) | |
1295 | return 0; | |
1296 | ret = trace_seq_printf(s, "[%02d] ", iter->cpu); | |
1297 | if (!ret) | |
1298 | return 0; | |
1299 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); | |
1300 | if (!ret) | |
1301 | return 0; | |
bc0c38d1 SR |
1302 | |
1303 | switch (entry->type) { | |
1304 | case TRACE_FN: | |
b3806b43 SR |
1305 | ret = seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
1306 | if (!ret) | |
1307 | return 0; | |
bc0c38d1 SR |
1308 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
1309 | entry->fn.parent_ip) { | |
b3806b43 SR |
1310 | ret = trace_seq_printf(s, " <-"); |
1311 | if (!ret) | |
1312 | return 0; | |
1313 | ret = seq_print_ip_sym(s, entry->fn.parent_ip, | |
1314 | sym_flags); | |
1315 | if (!ret) | |
1316 | return 0; | |
bc0c38d1 | 1317 | } |
b3806b43 SR |
1318 | ret = trace_seq_printf(s, "\n"); |
1319 | if (!ret) | |
1320 | return 0; | |
bc0c38d1 SR |
1321 | break; |
1322 | case TRACE_CTX: | |
57422797 | 1323 | case TRACE_WAKE: |
bc0c38d1 SR |
1324 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
1325 | state_to_char[entry->ctx.prev_state] : 'X'; | |
bac524d3 PZ |
1326 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
1327 | state_to_char[entry->ctx.next_state] : 'X'; | |
1328 | ret = trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d:%c\n", | |
b3806b43 SR |
1329 | entry->ctx.prev_pid, |
1330 | entry->ctx.prev_prio, | |
1331 | S, | |
57422797 | 1332 | entry->type == TRACE_CTX ? "==>" : " +", |
b3806b43 | 1333 | entry->ctx.next_pid, |
bac524d3 PZ |
1334 | entry->ctx.next_prio, |
1335 | T); | |
b3806b43 SR |
1336 | if (!ret) |
1337 | return 0; | |
bc0c38d1 | 1338 | break; |
f0a920d5 | 1339 | case TRACE_SPECIAL: |
88a4216c | 1340 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
f0a920d5 IM |
1341 | entry->special.arg1, |
1342 | entry->special.arg2, | |
1343 | entry->special.arg3); | |
1344 | if (!ret) | |
1345 | return 0; | |
1346 | break; | |
86387f7e IM |
1347 | case TRACE_STACK: |
1348 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { | |
1349 | if (i) { | |
1350 | ret = trace_seq_puts(s, " <= "); | |
1351 | if (!ret) | |
1352 | return 0; | |
1353 | } | |
1354 | ret = seq_print_ip_sym(s, entry->stack.caller[i], | |
1355 | sym_flags); | |
1356 | if (!ret) | |
1357 | return 0; | |
1358 | } | |
1359 | ret = trace_seq_puts(s, "\n"); | |
1360 | if (!ret) | |
1361 | return 0; | |
1362 | break; | |
bc0c38d1 | 1363 | } |
b3806b43 | 1364 | return 1; |
bc0c38d1 SR |
1365 | } |
1366 | ||
e309b41d | 1367 | static int print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 IM |
1368 | { |
1369 | struct trace_seq *s = &iter->seq; | |
1370 | struct trace_entry *entry; | |
1371 | int ret; | |
bac524d3 | 1372 | int S, T; |
f9896bf3 IM |
1373 | |
1374 | entry = iter->ent; | |
1375 | ||
1376 | ret = trace_seq_printf(s, "%d %d %llu ", | |
1377 | entry->pid, iter->cpu, entry->t); | |
1378 | if (!ret) | |
1379 | return 0; | |
1380 | ||
1381 | switch (entry->type) { | |
1382 | case TRACE_FN: | |
1383 | ret = trace_seq_printf(s, "%x %x\n", | |
1384 | entry->fn.ip, entry->fn.parent_ip); | |
1385 | if (!ret) | |
1386 | return 0; | |
1387 | break; | |
1388 | case TRACE_CTX: | |
57422797 | 1389 | case TRACE_WAKE: |
f9896bf3 IM |
1390 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
1391 | state_to_char[entry->ctx.prev_state] : 'X'; | |
bac524d3 PZ |
1392 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
1393 | state_to_char[entry->ctx.next_state] : 'X'; | |
57422797 IM |
1394 | if (entry->type == TRACE_WAKE) |
1395 | S = '+'; | |
bac524d3 | 1396 | ret = trace_seq_printf(s, "%d %d %c %d %d %c\n", |
f9896bf3 IM |
1397 | entry->ctx.prev_pid, |
1398 | entry->ctx.prev_prio, | |
1399 | S, | |
1400 | entry->ctx.next_pid, | |
bac524d3 PZ |
1401 | entry->ctx.next_prio, |
1402 | T); | |
f9896bf3 IM |
1403 | if (!ret) |
1404 | return 0; | |
1405 | break; | |
f0a920d5 | 1406 | case TRACE_SPECIAL: |
86387f7e | 1407 | case TRACE_STACK: |
88a4216c | 1408 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
f0a920d5 IM |
1409 | entry->special.arg1, |
1410 | entry->special.arg2, | |
1411 | entry->special.arg3); | |
1412 | if (!ret) | |
1413 | return 0; | |
1414 | break; | |
f9896bf3 IM |
1415 | } |
1416 | return 1; | |
1417 | } | |
1418 | ||
cb0f12aa IM |
1419 | #define SEQ_PUT_FIELD_RET(s, x) \ |
1420 | do { \ | |
1421 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ | |
1422 | return 0; \ | |
1423 | } while (0) | |
1424 | ||
5e3ca0ec IM |
1425 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
1426 | do { \ | |
1427 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ | |
1428 | return 0; \ | |
1429 | } while (0) | |
1430 | ||
e309b41d | 1431 | static int print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec IM |
1432 | { |
1433 | struct trace_seq *s = &iter->seq; | |
1434 | unsigned char newline = '\n'; | |
1435 | struct trace_entry *entry; | |
bac524d3 | 1436 | int S, T; |
5e3ca0ec IM |
1437 | |
1438 | entry = iter->ent; | |
1439 | ||
1440 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); | |
1441 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); | |
1442 | SEQ_PUT_HEX_FIELD_RET(s, entry->t); | |
1443 | ||
1444 | switch (entry->type) { | |
1445 | case TRACE_FN: | |
1446 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.ip); | |
1447 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); | |
1448 | break; | |
1449 | case TRACE_CTX: | |
57422797 | 1450 | case TRACE_WAKE: |
5e3ca0ec IM |
1451 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
1452 | state_to_char[entry->ctx.prev_state] : 'X'; | |
bac524d3 PZ |
1453 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
1454 | state_to_char[entry->ctx.next_state] : 'X'; | |
57422797 IM |
1455 | if (entry->type == TRACE_WAKE) |
1456 | S = '+'; | |
5e3ca0ec IM |
1457 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_pid); |
1458 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_prio); | |
1459 | SEQ_PUT_HEX_FIELD_RET(s, S); | |
1460 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_pid); | |
1461 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_prio); | |
1462 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); | |
bac524d3 | 1463 | SEQ_PUT_HEX_FIELD_RET(s, T); |
5e3ca0ec IM |
1464 | break; |
1465 | case TRACE_SPECIAL: | |
86387f7e | 1466 | case TRACE_STACK: |
5e3ca0ec IM |
1467 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg1); |
1468 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg2); | |
1469 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg3); | |
1470 | break; | |
1471 | } | |
1472 | SEQ_PUT_FIELD_RET(s, newline); | |
1473 | ||
1474 | return 1; | |
1475 | } | |
1476 | ||
e309b41d | 1477 | static int print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa IM |
1478 | { |
1479 | struct trace_seq *s = &iter->seq; | |
1480 | struct trace_entry *entry; | |
1481 | ||
1482 | entry = iter->ent; | |
1483 | ||
1484 | SEQ_PUT_FIELD_RET(s, entry->pid); | |
1485 | SEQ_PUT_FIELD_RET(s, entry->cpu); | |
1486 | SEQ_PUT_FIELD_RET(s, entry->t); | |
1487 | ||
1488 | switch (entry->type) { | |
1489 | case TRACE_FN: | |
1490 | SEQ_PUT_FIELD_RET(s, entry->fn.ip); | |
1491 | SEQ_PUT_FIELD_RET(s, entry->fn.parent_ip); | |
1492 | break; | |
1493 | case TRACE_CTX: | |
1494 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_pid); | |
1495 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_prio); | |
1496 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_state); | |
1497 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_pid); | |
1498 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_prio); | |
bac524d3 | 1499 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_state); |
cb0f12aa | 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 | { | |
72829bc3 TG |
1529 | if (iter->trace && iter->trace->print_line) |
1530 | return iter->trace->print_line(iter); | |
1531 | ||
cb0f12aa IM |
1532 | if (trace_flags & TRACE_ITER_BIN) |
1533 | return print_bin_fmt(iter); | |
1534 | ||
5e3ca0ec IM |
1535 | if (trace_flags & TRACE_ITER_HEX) |
1536 | return print_hex_fmt(iter); | |
1537 | ||
f9896bf3 IM |
1538 | if (trace_flags & TRACE_ITER_RAW) |
1539 | return print_raw_fmt(iter); | |
1540 | ||
1541 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
1542 | return print_lat_fmt(iter, iter->idx, iter->cpu); | |
1543 | ||
1544 | return print_trace_fmt(iter); | |
1545 | } | |
1546 | ||
bc0c38d1 SR |
1547 | static int s_show(struct seq_file *m, void *v) |
1548 | { | |
1549 | struct trace_iterator *iter = v; | |
1550 | ||
1551 | if (iter->ent == NULL) { | |
1552 | if (iter->tr) { | |
1553 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
1554 | seq_puts(m, "#\n"); | |
1555 | } | |
1556 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { | |
1557 | /* print nothing if the buffers are empty */ | |
1558 | if (trace_empty(iter)) | |
1559 | return 0; | |
1560 | print_trace_header(m, iter); | |
1561 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1562 | print_lat_help_header(m); | |
1563 | } else { | |
1564 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1565 | print_func_help_header(m); | |
1566 | } | |
1567 | } else { | |
f9896bf3 | 1568 | print_trace_line(iter); |
214023c3 | 1569 | trace_print_seq(m, &iter->seq); |
bc0c38d1 SR |
1570 | } |
1571 | ||
1572 | return 0; | |
1573 | } | |
1574 | ||
1575 | static struct seq_operations tracer_seq_ops = { | |
4bf39a94 IM |
1576 | .start = s_start, |
1577 | .next = s_next, | |
1578 | .stop = s_stop, | |
1579 | .show = s_show, | |
bc0c38d1 SR |
1580 | }; |
1581 | ||
e309b41d | 1582 | static struct trace_iterator * |
bc0c38d1 SR |
1583 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
1584 | { | |
1585 | struct trace_iterator *iter; | |
1586 | ||
60a11774 SR |
1587 | if (tracing_disabled) { |
1588 | *ret = -ENODEV; | |
1589 | return NULL; | |
1590 | } | |
1591 | ||
bc0c38d1 SR |
1592 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
1593 | if (!iter) { | |
1594 | *ret = -ENOMEM; | |
1595 | goto out; | |
1596 | } | |
1597 | ||
1598 | mutex_lock(&trace_types_lock); | |
1599 | if (current_trace && current_trace->print_max) | |
1600 | iter->tr = &max_tr; | |
1601 | else | |
1602 | iter->tr = inode->i_private; | |
1603 | iter->trace = current_trace; | |
1604 | iter->pos = -1; | |
1605 | ||
1606 | /* TODO stop tracer */ | |
1607 | *ret = seq_open(file, &tracer_seq_ops); | |
1608 | if (!*ret) { | |
1609 | struct seq_file *m = file->private_data; | |
1610 | m->private = iter; | |
1611 | ||
1612 | /* stop the trace while dumping */ | |
1613 | if (iter->tr->ctrl) | |
1614 | tracer_enabled = 0; | |
1615 | ||
1616 | if (iter->trace && iter->trace->open) | |
1617 | iter->trace->open(iter); | |
1618 | } else { | |
1619 | kfree(iter); | |
1620 | iter = NULL; | |
1621 | } | |
1622 | mutex_unlock(&trace_types_lock); | |
1623 | ||
1624 | out: | |
1625 | return iter; | |
1626 | } | |
1627 | ||
1628 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
1629 | { | |
60a11774 SR |
1630 | if (tracing_disabled) |
1631 | return -ENODEV; | |
1632 | ||
bc0c38d1 SR |
1633 | filp->private_data = inode->i_private; |
1634 | return 0; | |
1635 | } | |
1636 | ||
1637 | int tracing_release(struct inode *inode, struct file *file) | |
1638 | { | |
1639 | struct seq_file *m = (struct seq_file *)file->private_data; | |
1640 | struct trace_iterator *iter = m->private; | |
1641 | ||
1642 | mutex_lock(&trace_types_lock); | |
1643 | if (iter->trace && iter->trace->close) | |
1644 | iter->trace->close(iter); | |
1645 | ||
1646 | /* reenable tracing if it was previously enabled */ | |
1647 | if (iter->tr->ctrl) | |
1648 | tracer_enabled = 1; | |
1649 | mutex_unlock(&trace_types_lock); | |
1650 | ||
1651 | seq_release(inode, file); | |
1652 | kfree(iter); | |
1653 | return 0; | |
1654 | } | |
1655 | ||
1656 | static int tracing_open(struct inode *inode, struct file *file) | |
1657 | { | |
1658 | int ret; | |
1659 | ||
1660 | __tracing_open(inode, file, &ret); | |
1661 | ||
1662 | return ret; | |
1663 | } | |
1664 | ||
1665 | static int tracing_lt_open(struct inode *inode, struct file *file) | |
1666 | { | |
1667 | struct trace_iterator *iter; | |
1668 | int ret; | |
1669 | ||
1670 | iter = __tracing_open(inode, file, &ret); | |
1671 | ||
1672 | if (!ret) | |
1673 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
1674 | ||
1675 | return ret; | |
1676 | } | |
1677 | ||
1678 | ||
e309b41d | 1679 | static void * |
bc0c38d1 SR |
1680 | t_next(struct seq_file *m, void *v, loff_t *pos) |
1681 | { | |
1682 | struct tracer *t = m->private; | |
1683 | ||
1684 | (*pos)++; | |
1685 | ||
1686 | if (t) | |
1687 | t = t->next; | |
1688 | ||
1689 | m->private = t; | |
1690 | ||
1691 | return t; | |
1692 | } | |
1693 | ||
1694 | static void *t_start(struct seq_file *m, loff_t *pos) | |
1695 | { | |
1696 | struct tracer *t = m->private; | |
1697 | loff_t l = 0; | |
1698 | ||
1699 | mutex_lock(&trace_types_lock); | |
1700 | for (; t && l < *pos; t = t_next(m, t, &l)) | |
1701 | ; | |
1702 | ||
1703 | return t; | |
1704 | } | |
1705 | ||
1706 | static void t_stop(struct seq_file *m, void *p) | |
1707 | { | |
1708 | mutex_unlock(&trace_types_lock); | |
1709 | } | |
1710 | ||
1711 | static int t_show(struct seq_file *m, void *v) | |
1712 | { | |
1713 | struct tracer *t = v; | |
1714 | ||
1715 | if (!t) | |
1716 | return 0; | |
1717 | ||
1718 | seq_printf(m, "%s", t->name); | |
1719 | if (t->next) | |
1720 | seq_putc(m, ' '); | |
1721 | else | |
1722 | seq_putc(m, '\n'); | |
1723 | ||
1724 | return 0; | |
1725 | } | |
1726 | ||
1727 | static struct seq_operations show_traces_seq_ops = { | |
4bf39a94 IM |
1728 | .start = t_start, |
1729 | .next = t_next, | |
1730 | .stop = t_stop, | |
1731 | .show = t_show, | |
bc0c38d1 SR |
1732 | }; |
1733 | ||
1734 | static int show_traces_open(struct inode *inode, struct file *file) | |
1735 | { | |
1736 | int ret; | |
1737 | ||
60a11774 SR |
1738 | if (tracing_disabled) |
1739 | return -ENODEV; | |
1740 | ||
bc0c38d1 SR |
1741 | ret = seq_open(file, &show_traces_seq_ops); |
1742 | if (!ret) { | |
1743 | struct seq_file *m = file->private_data; | |
1744 | m->private = trace_types; | |
1745 | } | |
1746 | ||
1747 | return ret; | |
1748 | } | |
1749 | ||
1750 | static struct file_operations tracing_fops = { | |
4bf39a94 IM |
1751 | .open = tracing_open, |
1752 | .read = seq_read, | |
1753 | .llseek = seq_lseek, | |
1754 | .release = tracing_release, | |
bc0c38d1 SR |
1755 | }; |
1756 | ||
1757 | static struct file_operations tracing_lt_fops = { | |
4bf39a94 IM |
1758 | .open = tracing_lt_open, |
1759 | .read = seq_read, | |
1760 | .llseek = seq_lseek, | |
1761 | .release = tracing_release, | |
bc0c38d1 SR |
1762 | }; |
1763 | ||
1764 | static struct file_operations show_traces_fops = { | |
c7078de1 IM |
1765 | .open = show_traces_open, |
1766 | .read = seq_read, | |
1767 | .release = seq_release, | |
1768 | }; | |
1769 | ||
36dfe925 IM |
1770 | /* |
1771 | * Only trace on a CPU if the bitmask is set: | |
1772 | */ | |
1773 | static cpumask_t tracing_cpumask = CPU_MASK_ALL; | |
1774 | ||
1775 | /* | |
1776 | * When tracing/tracing_cpu_mask is modified then this holds | |
1777 | * the new bitmask we are about to install: | |
1778 | */ | |
1779 | static cpumask_t tracing_cpumask_new; | |
1780 | ||
1781 | /* | |
1782 | * The tracer itself will not take this lock, but still we want | |
1783 | * to provide a consistent cpumask to user-space: | |
1784 | */ | |
1785 | static DEFINE_MUTEX(tracing_cpumask_update_lock); | |
1786 | ||
1787 | /* | |
1788 | * Temporary storage for the character representation of the | |
1789 | * CPU bitmask (and one more byte for the newline): | |
1790 | */ | |
1791 | static char mask_str[NR_CPUS + 1]; | |
1792 | ||
c7078de1 IM |
1793 | static ssize_t |
1794 | tracing_cpumask_read(struct file *filp, char __user *ubuf, | |
1795 | size_t count, loff_t *ppos) | |
1796 | { | |
36dfe925 | 1797 | int len; |
c7078de1 IM |
1798 | |
1799 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 IM |
1800 | |
1801 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); | |
1802 | if (count - len < 2) { | |
1803 | count = -EINVAL; | |
1804 | goto out_err; | |
1805 | } | |
1806 | len += sprintf(mask_str + len, "\n"); | |
1807 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); | |
1808 | ||
1809 | out_err: | |
c7078de1 IM |
1810 | mutex_unlock(&tracing_cpumask_update_lock); |
1811 | ||
1812 | return count; | |
1813 | } | |
1814 | ||
1815 | static ssize_t | |
1816 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, | |
1817 | size_t count, loff_t *ppos) | |
1818 | { | |
36dfe925 | 1819 | int err, cpu; |
c7078de1 IM |
1820 | |
1821 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 | 1822 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
c7078de1 | 1823 | if (err) |
36dfe925 IM |
1824 | goto err_unlock; |
1825 | ||
92205c23 SR |
1826 | raw_local_irq_disable(); |
1827 | __raw_spin_lock(&ftrace_max_lock); | |
36dfe925 IM |
1828 | for_each_possible_cpu(cpu) { |
1829 | /* | |
1830 | * Increase/decrease the disabled counter if we are | |
1831 | * about to flip a bit in the cpumask: | |
1832 | */ | |
1833 | if (cpu_isset(cpu, tracing_cpumask) && | |
1834 | !cpu_isset(cpu, tracing_cpumask_new)) { | |
1835 | atomic_inc(&global_trace.data[cpu]->disabled); | |
1836 | } | |
1837 | if (!cpu_isset(cpu, tracing_cpumask) && | |
1838 | cpu_isset(cpu, tracing_cpumask_new)) { | |
1839 | atomic_dec(&global_trace.data[cpu]->disabled); | |
1840 | } | |
1841 | } | |
92205c23 SR |
1842 | __raw_spin_unlock(&ftrace_max_lock); |
1843 | raw_local_irq_enable(); | |
36dfe925 IM |
1844 | |
1845 | tracing_cpumask = tracing_cpumask_new; | |
1846 | ||
1847 | mutex_unlock(&tracing_cpumask_update_lock); | |
c7078de1 IM |
1848 | |
1849 | return count; | |
36dfe925 IM |
1850 | |
1851 | err_unlock: | |
1852 | mutex_unlock(&tracing_cpumask_update_lock); | |
1853 | ||
1854 | return err; | |
c7078de1 IM |
1855 | } |
1856 | ||
1857 | static struct file_operations tracing_cpumask_fops = { | |
1858 | .open = tracing_open_generic, | |
1859 | .read = tracing_cpumask_read, | |
1860 | .write = tracing_cpumask_write, | |
bc0c38d1 SR |
1861 | }; |
1862 | ||
1863 | static ssize_t | |
1864 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, | |
1865 | size_t cnt, loff_t *ppos) | |
1866 | { | |
1867 | char *buf; | |
1868 | int r = 0; | |
1869 | int len = 0; | |
1870 | int i; | |
1871 | ||
1872 | /* calulate max size */ | |
1873 | for (i = 0; trace_options[i]; i++) { | |
1874 | len += strlen(trace_options[i]); | |
1875 | len += 3; /* "no" and space */ | |
1876 | } | |
1877 | ||
1878 | /* +2 for \n and \0 */ | |
1879 | buf = kmalloc(len + 2, GFP_KERNEL); | |
1880 | if (!buf) | |
1881 | return -ENOMEM; | |
1882 | ||
1883 | for (i = 0; trace_options[i]; i++) { | |
1884 | if (trace_flags & (1 << i)) | |
1885 | r += sprintf(buf + r, "%s ", trace_options[i]); | |
1886 | else | |
1887 | r += sprintf(buf + r, "no%s ", trace_options[i]); | |
1888 | } | |
1889 | ||
1890 | r += sprintf(buf + r, "\n"); | |
1891 | WARN_ON(r >= len + 2); | |
1892 | ||
36dfe925 | 1893 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
1894 | |
1895 | kfree(buf); | |
1896 | ||
1897 | return r; | |
1898 | } | |
1899 | ||
1900 | static ssize_t | |
1901 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, | |
1902 | size_t cnt, loff_t *ppos) | |
1903 | { | |
1904 | char buf[64]; | |
1905 | char *cmp = buf; | |
1906 | int neg = 0; | |
1907 | int i; | |
1908 | ||
1909 | if (cnt > 63) | |
1910 | cnt = 63; | |
1911 | ||
1912 | if (copy_from_user(&buf, ubuf, cnt)) | |
1913 | return -EFAULT; | |
1914 | ||
1915 | buf[cnt] = 0; | |
1916 | ||
1917 | if (strncmp(buf, "no", 2) == 0) { | |
1918 | neg = 1; | |
1919 | cmp += 2; | |
1920 | } | |
1921 | ||
1922 | for (i = 0; trace_options[i]; i++) { | |
1923 | int len = strlen(trace_options[i]); | |
1924 | ||
1925 | if (strncmp(cmp, trace_options[i], len) == 0) { | |
1926 | if (neg) | |
1927 | trace_flags &= ~(1 << i); | |
1928 | else | |
1929 | trace_flags |= (1 << i); | |
1930 | break; | |
1931 | } | |
1932 | } | |
442e544c IM |
1933 | /* |
1934 | * If no option could be set, return an error: | |
1935 | */ | |
1936 | if (!trace_options[i]) | |
1937 | return -EINVAL; | |
bc0c38d1 SR |
1938 | |
1939 | filp->f_pos += cnt; | |
1940 | ||
1941 | return cnt; | |
1942 | } | |
1943 | ||
1944 | static struct file_operations tracing_iter_fops = { | |
c7078de1 IM |
1945 | .open = tracing_open_generic, |
1946 | .read = tracing_iter_ctrl_read, | |
1947 | .write = tracing_iter_ctrl_write, | |
bc0c38d1 SR |
1948 | }; |
1949 | ||
7bd2f24c IM |
1950 | static const char readme_msg[] = |
1951 | "tracing mini-HOWTO:\n\n" | |
1952 | "# mkdir /debug\n" | |
1953 | "# mount -t debugfs nodev /debug\n\n" | |
1954 | "# cat /debug/tracing/available_tracers\n" | |
1955 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" | |
1956 | "# cat /debug/tracing/current_tracer\n" | |
1957 | "none\n" | |
1958 | "# echo sched_switch > /debug/tracing/current_tracer\n" | |
1959 | "# cat /debug/tracing/current_tracer\n" | |
1960 | "sched_switch\n" | |
1961 | "# cat /debug/tracing/iter_ctrl\n" | |
1962 | "noprint-parent nosym-offset nosym-addr noverbose\n" | |
1963 | "# echo print-parent > /debug/tracing/iter_ctrl\n" | |
1964 | "# echo 1 > /debug/tracing/tracing_enabled\n" | |
1965 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" | |
1966 | "echo 0 > /debug/tracing/tracing_enabled\n" | |
1967 | ; | |
1968 | ||
1969 | static ssize_t | |
1970 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
1971 | size_t cnt, loff_t *ppos) | |
1972 | { | |
1973 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
1974 | readme_msg, strlen(readme_msg)); | |
1975 | } | |
1976 | ||
1977 | static struct file_operations tracing_readme_fops = { | |
c7078de1 IM |
1978 | .open = tracing_open_generic, |
1979 | .read = tracing_readme_read, | |
7bd2f24c IM |
1980 | }; |
1981 | ||
bc0c38d1 SR |
1982 | static ssize_t |
1983 | tracing_ctrl_read(struct file *filp, char __user *ubuf, | |
1984 | size_t cnt, loff_t *ppos) | |
1985 | { | |
1986 | struct trace_array *tr = filp->private_data; | |
1987 | char buf[64]; | |
1988 | int r; | |
1989 | ||
1990 | r = sprintf(buf, "%ld\n", tr->ctrl); | |
4e3c3333 | 1991 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
1992 | } |
1993 | ||
1994 | static ssize_t | |
1995 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, | |
1996 | size_t cnt, loff_t *ppos) | |
1997 | { | |
1998 | struct trace_array *tr = filp->private_data; | |
1999 | long val; | |
2000 | char buf[64]; | |
2001 | ||
2002 | if (cnt > 63) | |
2003 | cnt = 63; | |
2004 | ||
2005 | if (copy_from_user(&buf, ubuf, cnt)) | |
2006 | return -EFAULT; | |
2007 | ||
2008 | buf[cnt] = 0; | |
2009 | ||
2010 | val = simple_strtoul(buf, NULL, 10); | |
2011 | ||
2012 | val = !!val; | |
2013 | ||
2014 | mutex_lock(&trace_types_lock); | |
2015 | if (tr->ctrl ^ val) { | |
2016 | if (val) | |
2017 | tracer_enabled = 1; | |
2018 | else | |
2019 | tracer_enabled = 0; | |
2020 | ||
2021 | tr->ctrl = val; | |
2022 | ||
2023 | if (current_trace && current_trace->ctrl_update) | |
2024 | current_trace->ctrl_update(tr); | |
2025 | } | |
2026 | mutex_unlock(&trace_types_lock); | |
2027 | ||
2028 | filp->f_pos += cnt; | |
2029 | ||
2030 | return cnt; | |
2031 | } | |
2032 | ||
2033 | static ssize_t | |
2034 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
2035 | size_t cnt, loff_t *ppos) | |
2036 | { | |
2037 | char buf[max_tracer_type_len+2]; | |
2038 | int r; | |
2039 | ||
2040 | mutex_lock(&trace_types_lock); | |
2041 | if (current_trace) | |
2042 | r = sprintf(buf, "%s\n", current_trace->name); | |
2043 | else | |
2044 | r = sprintf(buf, "\n"); | |
2045 | mutex_unlock(&trace_types_lock); | |
2046 | ||
4bf39a94 | 2047 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2048 | } |
2049 | ||
2050 | static ssize_t | |
2051 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
2052 | size_t cnt, loff_t *ppos) | |
2053 | { | |
2054 | struct trace_array *tr = &global_trace; | |
2055 | struct tracer *t; | |
2056 | char buf[max_tracer_type_len+1]; | |
2057 | int i; | |
2058 | ||
2059 | if (cnt > max_tracer_type_len) | |
2060 | cnt = max_tracer_type_len; | |
2061 | ||
2062 | if (copy_from_user(&buf, ubuf, cnt)) | |
2063 | return -EFAULT; | |
2064 | ||
2065 | buf[cnt] = 0; | |
2066 | ||
2067 | /* strip ending whitespace. */ | |
2068 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
2069 | buf[i] = 0; | |
2070 | ||
2071 | mutex_lock(&trace_types_lock); | |
2072 | for (t = trace_types; t; t = t->next) { | |
2073 | if (strcmp(t->name, buf) == 0) | |
2074 | break; | |
2075 | } | |
2076 | if (!t || t == current_trace) | |
2077 | goto out; | |
2078 | ||
2079 | if (current_trace && current_trace->reset) | |
2080 | current_trace->reset(tr); | |
2081 | ||
2082 | current_trace = t; | |
2083 | if (t->init) | |
2084 | t->init(tr); | |
2085 | ||
2086 | out: | |
2087 | mutex_unlock(&trace_types_lock); | |
2088 | ||
2089 | filp->f_pos += cnt; | |
2090 | ||
2091 | return cnt; | |
2092 | } | |
2093 | ||
2094 | static ssize_t | |
2095 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
2096 | size_t cnt, loff_t *ppos) | |
2097 | { | |
2098 | unsigned long *ptr = filp->private_data; | |
2099 | char buf[64]; | |
2100 | int r; | |
2101 | ||
2102 | r = snprintf(buf, 64, "%ld\n", | |
2103 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); | |
2104 | if (r > 64) | |
2105 | r = 64; | |
4bf39a94 | 2106 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2107 | } |
2108 | ||
2109 | static ssize_t | |
2110 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
2111 | size_t cnt, loff_t *ppos) | |
2112 | { | |
2113 | long *ptr = filp->private_data; | |
2114 | long val; | |
2115 | char buf[64]; | |
2116 | ||
2117 | if (cnt > 63) | |
2118 | cnt = 63; | |
2119 | ||
2120 | if (copy_from_user(&buf, ubuf, cnt)) | |
2121 | return -EFAULT; | |
2122 | ||
2123 | buf[cnt] = 0; | |
2124 | ||
2125 | val = simple_strtoul(buf, NULL, 10); | |
2126 | ||
2127 | *ptr = val * 1000; | |
2128 | ||
2129 | return cnt; | |
2130 | } | |
2131 | ||
b3806b43 SR |
2132 | static atomic_t tracing_reader; |
2133 | ||
2134 | static int tracing_open_pipe(struct inode *inode, struct file *filp) | |
2135 | { | |
2136 | struct trace_iterator *iter; | |
2137 | ||
2138 | if (tracing_disabled) | |
2139 | return -ENODEV; | |
2140 | ||
2141 | /* We only allow for reader of the pipe */ | |
2142 | if (atomic_inc_return(&tracing_reader) != 1) { | |
2143 | atomic_dec(&tracing_reader); | |
2144 | return -EBUSY; | |
2145 | } | |
2146 | ||
2147 | /* create a buffer to store the information to pass to userspace */ | |
2148 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
2149 | if (!iter) | |
2150 | return -ENOMEM; | |
2151 | ||
2152 | iter->tr = &global_trace; | |
72829bc3 | 2153 | iter->trace = current_trace; |
b3806b43 SR |
2154 | |
2155 | filp->private_data = iter; | |
2156 | ||
2157 | return 0; | |
2158 | } | |
2159 | ||
2160 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
2161 | { | |
2162 | struct trace_iterator *iter = file->private_data; | |
2163 | ||
2164 | kfree(iter); | |
2165 | atomic_dec(&tracing_reader); | |
2166 | ||
2167 | return 0; | |
2168 | } | |
2169 | ||
2a2cc8f7 SSP |
2170 | static unsigned int |
2171 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) | |
2172 | { | |
2173 | struct trace_iterator *iter = filp->private_data; | |
2174 | ||
2175 | if (trace_flags & TRACE_ITER_BLOCK) { | |
2176 | /* | |
2177 | * Always select as readable when in blocking mode | |
2178 | */ | |
2179 | return POLLIN | POLLRDNORM; | |
afc2abc0 | 2180 | } else { |
2a2cc8f7 SSP |
2181 | if (!trace_empty(iter)) |
2182 | return POLLIN | POLLRDNORM; | |
2183 | poll_wait(filp, &trace_wait, poll_table); | |
2184 | if (!trace_empty(iter)) | |
2185 | return POLLIN | POLLRDNORM; | |
2186 | ||
2187 | return 0; | |
2188 | } | |
2189 | } | |
2190 | ||
b3806b43 SR |
2191 | /* |
2192 | * Consumer reader. | |
2193 | */ | |
2194 | static ssize_t | |
2195 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
2196 | size_t cnt, loff_t *ppos) | |
2197 | { | |
2198 | struct trace_iterator *iter = filp->private_data; | |
2199 | struct trace_array_cpu *data; | |
b5685aed SR |
2200 | struct trace_array *tr = iter->tr; |
2201 | struct tracer *tracer = iter->trace; | |
b3806b43 | 2202 | static cpumask_t mask; |
b3806b43 SR |
2203 | static int start; |
2204 | unsigned long flags; | |
25770467 | 2205 | #ifdef CONFIG_FTRACE |
2e0f5761 | 2206 | int ftrace_save; |
25770467 | 2207 | #endif |
b3806b43 SR |
2208 | int read = 0; |
2209 | int cpu; | |
2210 | int len; | |
2211 | int ret; | |
2212 | ||
2213 | /* return any leftover data */ | |
2214 | if (iter->seq.len > start) { | |
2215 | len = iter->seq.len - start; | |
2216 | if (cnt > len) | |
2217 | cnt = len; | |
2218 | ret = copy_to_user(ubuf, iter->seq.buffer + start, cnt); | |
2219 | if (ret) | |
2220 | cnt = -EFAULT; | |
2221 | ||
2222 | start += len; | |
2223 | ||
2224 | return cnt; | |
2225 | } | |
2226 | ||
2227 | trace_seq_reset(&iter->seq); | |
2228 | start = 0; | |
2229 | ||
2230 | while (trace_empty(iter)) { | |
2dc8f095 SR |
2231 | |
2232 | if ((filp->f_flags & O_NONBLOCK)) | |
2233 | return -EAGAIN; | |
2234 | ||
b3806b43 SR |
2235 | /* |
2236 | * This is a make-shift waitqueue. The reason we don't use | |
2237 | * an actual wait queue is because: | |
2238 | * 1) we only ever have one waiter | |
2239 | * 2) the tracing, traces all functions, we don't want | |
2240 | * the overhead of calling wake_up and friends | |
2241 | * (and tracing them too) | |
2242 | * Anyway, this is really very primitive wakeup. | |
2243 | */ | |
2244 | set_current_state(TASK_INTERRUPTIBLE); | |
2245 | iter->tr->waiter = current; | |
2246 | ||
2247 | /* sleep for one second, and try again. */ | |
2248 | schedule_timeout(HZ); | |
2249 | ||
2250 | iter->tr->waiter = NULL; | |
2251 | ||
2252 | if (signal_pending(current)) | |
2253 | return -EINTR; | |
2254 | ||
84527997 SR |
2255 | if (iter->trace != current_trace) |
2256 | return 0; | |
2257 | ||
b3806b43 SR |
2258 | /* |
2259 | * We block until we read something and tracing is disabled. | |
2260 | * We still block if tracing is disabled, but we have never | |
2261 | * read anything. This allows a user to cat this file, and | |
2262 | * then enable tracing. But after we have read something, | |
2263 | * we give an EOF when tracing is again disabled. | |
2264 | * | |
2265 | * iter->pos will be 0 if we haven't read anything. | |
2266 | */ | |
2267 | if (!tracer_enabled && iter->pos) | |
2268 | break; | |
2269 | ||
2270 | continue; | |
2271 | } | |
2272 | ||
2273 | /* stop when tracing is finished */ | |
2274 | if (trace_empty(iter)) | |
2275 | return 0; | |
2276 | ||
2277 | if (cnt >= PAGE_SIZE) | |
2278 | cnt = PAGE_SIZE - 1; | |
2279 | ||
2280 | memset(iter, 0, sizeof(*iter)); | |
b5685aed SR |
2281 | iter->tr = tr; |
2282 | iter->trace = tracer; | |
b3806b43 SR |
2283 | iter->pos = -1; |
2284 | ||
2285 | /* | |
2286 | * We need to stop all tracing on all CPUS to read the | |
2287 | * the next buffer. This is a bit expensive, but is | |
2288 | * not done often. We fill all what we can read, | |
2289 | * and then release the locks again. | |
2290 | */ | |
2291 | ||
2292 | cpus_clear(mask); | |
2293 | local_irq_save(flags); | |
25770467 | 2294 | #ifdef CONFIG_FTRACE |
2e0f5761 IM |
2295 | ftrace_save = ftrace_enabled; |
2296 | ftrace_enabled = 0; | |
25770467 | 2297 | #endif |
2e0f5761 | 2298 | smp_wmb(); |
b3806b43 SR |
2299 | for_each_possible_cpu(cpu) { |
2300 | data = iter->tr->data[cpu]; | |
2301 | ||
2302 | if (!head_page(data) || !data->trace_idx) | |
2303 | continue; | |
2304 | ||
2305 | atomic_inc(&data->disabled); | |
b3806b43 SR |
2306 | cpu_set(cpu, mask); |
2307 | } | |
2308 | ||
2e0f5761 IM |
2309 | for_each_cpu_mask(cpu, mask) { |
2310 | data = iter->tr->data[cpu]; | |
92205c23 | 2311 | __raw_spin_lock(&data->lock); |
2e0f5761 IM |
2312 | } |
2313 | ||
088b1e42 SR |
2314 | while (find_next_entry_inc(iter) != NULL) { |
2315 | int len = iter->seq.len; | |
2316 | ||
f9896bf3 | 2317 | ret = print_trace_line(iter); |
088b1e42 SR |
2318 | if (!ret) { |
2319 | /* don't print partial lines */ | |
2320 | iter->seq.len = len; | |
b3806b43 | 2321 | break; |
088b1e42 | 2322 | } |
b3806b43 SR |
2323 | |
2324 | trace_consume(iter); | |
2325 | ||
2326 | if (iter->seq.len >= cnt) | |
2327 | break; | |
b3806b43 SR |
2328 | } |
2329 | ||
d4c5a2f5 | 2330 | for_each_cpu_mask(cpu, mask) { |
b3806b43 | 2331 | data = iter->tr->data[cpu]; |
92205c23 | 2332 | __raw_spin_unlock(&data->lock); |
2e0f5761 IM |
2333 | } |
2334 | ||
2335 | for_each_cpu_mask(cpu, mask) { | |
2336 | data = iter->tr->data[cpu]; | |
b3806b43 SR |
2337 | atomic_dec(&data->disabled); |
2338 | } | |
25770467 | 2339 | #ifdef CONFIG_FTRACE |
2e0f5761 | 2340 | ftrace_enabled = ftrace_save; |
25770467 | 2341 | #endif |
b3806b43 SR |
2342 | local_irq_restore(flags); |
2343 | ||
2344 | /* Now copy what we have to the user */ | |
2345 | read = iter->seq.len; | |
2346 | if (read > cnt) | |
2347 | read = cnt; | |
2348 | ||
2349 | ret = copy_to_user(ubuf, iter->seq.buffer, read); | |
2350 | ||
2351 | if (read < iter->seq.len) | |
2352 | start = read; | |
2353 | else | |
2354 | trace_seq_reset(&iter->seq); | |
2355 | ||
2356 | if (ret) | |
2357 | read = -EFAULT; | |
2358 | ||
2359 | return read; | |
2360 | } | |
2361 | ||
a98a3c3f SR |
2362 | static ssize_t |
2363 | tracing_entries_read(struct file *filp, char __user *ubuf, | |
2364 | size_t cnt, loff_t *ppos) | |
2365 | { | |
2366 | struct trace_array *tr = filp->private_data; | |
2367 | char buf[64]; | |
2368 | int r; | |
2369 | ||
2370 | r = sprintf(buf, "%lu\n", tr->entries); | |
2371 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
2372 | } | |
2373 | ||
2374 | static ssize_t | |
2375 | tracing_entries_write(struct file *filp, const char __user *ubuf, | |
2376 | size_t cnt, loff_t *ppos) | |
2377 | { | |
2378 | unsigned long val; | |
2379 | char buf[64]; | |
2380 | ||
2381 | if (cnt > 63) | |
2382 | cnt = 63; | |
2383 | ||
2384 | if (copy_from_user(&buf, ubuf, cnt)) | |
2385 | return -EFAULT; | |
2386 | ||
2387 | buf[cnt] = 0; | |
2388 | ||
2389 | val = simple_strtoul(buf, NULL, 10); | |
2390 | ||
2391 | /* must have at least 1 entry */ | |
2392 | if (!val) | |
2393 | return -EINVAL; | |
2394 | ||
2395 | mutex_lock(&trace_types_lock); | |
2396 | ||
2397 | if (current_trace != &no_tracer) { | |
2398 | cnt = -EBUSY; | |
2399 | pr_info("ftrace: set current_tracer to none" | |
2400 | " before modifying buffer size\n"); | |
2401 | goto out; | |
2402 | } | |
2403 | ||
2404 | if (val > global_trace.entries) { | |
2405 | while (global_trace.entries < val) { | |
2406 | if (trace_alloc_page()) { | |
2407 | cnt = -ENOMEM; | |
2408 | goto out; | |
2409 | } | |
2410 | } | |
2411 | } else { | |
2412 | /* include the number of entries in val (inc of page entries) */ | |
2413 | while (global_trace.entries > val + (ENTRIES_PER_PAGE - 1)) | |
2414 | trace_free_page(); | |
2415 | } | |
2416 | ||
2417 | filp->f_pos += cnt; | |
2418 | ||
2419 | out: | |
2420 | max_tr.entries = global_trace.entries; | |
2421 | mutex_unlock(&trace_types_lock); | |
2422 | ||
2423 | return cnt; | |
2424 | } | |
2425 | ||
bc0c38d1 | 2426 | static struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
2427 | .open = tracing_open_generic, |
2428 | .read = tracing_max_lat_read, | |
2429 | .write = tracing_max_lat_write, | |
bc0c38d1 SR |
2430 | }; |
2431 | ||
2432 | static struct file_operations tracing_ctrl_fops = { | |
4bf39a94 IM |
2433 | .open = tracing_open_generic, |
2434 | .read = tracing_ctrl_read, | |
2435 | .write = tracing_ctrl_write, | |
bc0c38d1 SR |
2436 | }; |
2437 | ||
2438 | static struct file_operations set_tracer_fops = { | |
4bf39a94 IM |
2439 | .open = tracing_open_generic, |
2440 | .read = tracing_set_trace_read, | |
2441 | .write = tracing_set_trace_write, | |
bc0c38d1 SR |
2442 | }; |
2443 | ||
b3806b43 | 2444 | static struct file_operations tracing_pipe_fops = { |
4bf39a94 | 2445 | .open = tracing_open_pipe, |
2a2cc8f7 | 2446 | .poll = tracing_poll_pipe, |
4bf39a94 IM |
2447 | .read = tracing_read_pipe, |
2448 | .release = tracing_release_pipe, | |
b3806b43 SR |
2449 | }; |
2450 | ||
a98a3c3f SR |
2451 | static struct file_operations tracing_entries_fops = { |
2452 | .open = tracing_open_generic, | |
2453 | .read = tracing_entries_read, | |
2454 | .write = tracing_entries_write, | |
2455 | }; | |
2456 | ||
bc0c38d1 SR |
2457 | #ifdef CONFIG_DYNAMIC_FTRACE |
2458 | ||
2459 | static ssize_t | |
2460 | tracing_read_long(struct file *filp, char __user *ubuf, | |
2461 | size_t cnt, loff_t *ppos) | |
2462 | { | |
2463 | unsigned long *p = filp->private_data; | |
2464 | char buf[64]; | |
2465 | int r; | |
2466 | ||
2467 | r = sprintf(buf, "%ld\n", *p); | |
4bf39a94 IM |
2468 | |
2469 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
bc0c38d1 SR |
2470 | } |
2471 | ||
2472 | static struct file_operations tracing_read_long_fops = { | |
4bf39a94 IM |
2473 | .open = tracing_open_generic, |
2474 | .read = tracing_read_long, | |
bc0c38d1 SR |
2475 | }; |
2476 | #endif | |
2477 | ||
2478 | static struct dentry *d_tracer; | |
2479 | ||
2480 | struct dentry *tracing_init_dentry(void) | |
2481 | { | |
2482 | static int once; | |
2483 | ||
2484 | if (d_tracer) | |
2485 | return d_tracer; | |
2486 | ||
2487 | d_tracer = debugfs_create_dir("tracing", NULL); | |
2488 | ||
2489 | if (!d_tracer && !once) { | |
2490 | once = 1; | |
2491 | pr_warning("Could not create debugfs directory 'tracing'\n"); | |
2492 | return NULL; | |
2493 | } | |
2494 | ||
2495 | return d_tracer; | |
2496 | } | |
2497 | ||
60a11774 SR |
2498 | #ifdef CONFIG_FTRACE_SELFTEST |
2499 | /* Let selftest have access to static functions in this file */ | |
2500 | #include "trace_selftest.c" | |
2501 | #endif | |
2502 | ||
bc0c38d1 SR |
2503 | static __init void tracer_init_debugfs(void) |
2504 | { | |
2505 | struct dentry *d_tracer; | |
2506 | struct dentry *entry; | |
2507 | ||
2508 | d_tracer = tracing_init_dentry(); | |
2509 | ||
2510 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, | |
2511 | &global_trace, &tracing_ctrl_fops); | |
2512 | if (!entry) | |
2513 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); | |
2514 | ||
2515 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, | |
2516 | NULL, &tracing_iter_fops); | |
2517 | if (!entry) | |
2518 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); | |
2519 | ||
c7078de1 IM |
2520 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
2521 | NULL, &tracing_cpumask_fops); | |
2522 | if (!entry) | |
2523 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); | |
2524 | ||
bc0c38d1 SR |
2525 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
2526 | &global_trace, &tracing_lt_fops); | |
2527 | if (!entry) | |
2528 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); | |
2529 | ||
2530 | entry = debugfs_create_file("trace", 0444, d_tracer, | |
2531 | &global_trace, &tracing_fops); | |
2532 | if (!entry) | |
2533 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2534 | ||
2535 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, | |
2536 | &global_trace, &show_traces_fops); | |
2537 | if (!entry) | |
2538 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2539 | ||
2540 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, | |
2541 | &global_trace, &set_tracer_fops); | |
2542 | if (!entry) | |
2543 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2544 | ||
2545 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, | |
2546 | &tracing_max_latency, | |
2547 | &tracing_max_lat_fops); | |
2548 | if (!entry) | |
2549 | pr_warning("Could not create debugfs " | |
2550 | "'tracing_max_latency' entry\n"); | |
2551 | ||
2552 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, | |
2553 | &tracing_thresh, &tracing_max_lat_fops); | |
2554 | if (!entry) | |
2555 | pr_warning("Could not create debugfs " | |
2556 | "'tracing_threash' entry\n"); | |
7bd2f24c IM |
2557 | entry = debugfs_create_file("README", 0644, d_tracer, |
2558 | NULL, &tracing_readme_fops); | |
2559 | if (!entry) | |
2560 | pr_warning("Could not create debugfs 'README' entry\n"); | |
2561 | ||
b3806b43 SR |
2562 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
2563 | NULL, &tracing_pipe_fops); | |
2564 | if (!entry) | |
2565 | pr_warning("Could not create debugfs " | |
2566 | "'tracing_threash' entry\n"); | |
bc0c38d1 | 2567 | |
a98a3c3f SR |
2568 | entry = debugfs_create_file("trace_entries", 0644, d_tracer, |
2569 | &global_trace, &tracing_entries_fops); | |
2570 | if (!entry) | |
2571 | pr_warning("Could not create debugfs " | |
2572 | "'tracing_threash' entry\n"); | |
2573 | ||
bc0c38d1 SR |
2574 | #ifdef CONFIG_DYNAMIC_FTRACE |
2575 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, | |
2576 | &ftrace_update_tot_cnt, | |
2577 | &tracing_read_long_fops); | |
2578 | if (!entry) | |
2579 | pr_warning("Could not create debugfs " | |
2580 | "'dyn_ftrace_total_info' entry\n"); | |
2581 | #endif | |
2582 | } | |
2583 | ||
4c11d7ae | 2584 | static int trace_alloc_page(void) |
bc0c38d1 | 2585 | { |
4c11d7ae | 2586 | struct trace_array_cpu *data; |
4c11d7ae SR |
2587 | struct page *page, *tmp; |
2588 | LIST_HEAD(pages); | |
c7aafc54 | 2589 | void *array; |
4c11d7ae SR |
2590 | int i; |
2591 | ||
2592 | /* first allocate a page for each CPU */ | |
2593 | for_each_possible_cpu(i) { | |
2594 | array = (void *)__get_free_page(GFP_KERNEL); | |
2595 | if (array == NULL) { | |
2596 | printk(KERN_ERR "tracer: failed to allocate page" | |
2597 | "for trace buffer!\n"); | |
2598 | goto free_pages; | |
2599 | } | |
2600 | ||
2601 | page = virt_to_page(array); | |
2602 | list_add(&page->lru, &pages); | |
2603 | ||
2604 | /* Only allocate if we are actually using the max trace */ | |
2605 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2606 | array = (void *)__get_free_page(GFP_KERNEL); | |
2607 | if (array == NULL) { | |
2608 | printk(KERN_ERR "tracer: failed to allocate page" | |
2609 | "for trace buffer!\n"); | |
2610 | goto free_pages; | |
2611 | } | |
2612 | page = virt_to_page(array); | |
2613 | list_add(&page->lru, &pages); | |
2614 | #endif | |
2615 | } | |
2616 | ||
2617 | /* Now that we successfully allocate a page per CPU, add them */ | |
2618 | for_each_possible_cpu(i) { | |
2619 | data = global_trace.data[i]; | |
2620 | page = list_entry(pages.next, struct page, lru); | |
c7aafc54 | 2621 | list_del_init(&page->lru); |
4c11d7ae SR |
2622 | list_add_tail(&page->lru, &data->trace_pages); |
2623 | ClearPageLRU(page); | |
2624 | ||
2625 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2626 | data = max_tr.data[i]; | |
2627 | page = list_entry(pages.next, struct page, lru); | |
c7aafc54 | 2628 | list_del_init(&page->lru); |
4c11d7ae SR |
2629 | list_add_tail(&page->lru, &data->trace_pages); |
2630 | SetPageLRU(page); | |
2631 | #endif | |
2632 | } | |
2633 | global_trace.entries += ENTRIES_PER_PAGE; | |
2634 | ||
2635 | return 0; | |
2636 | ||
2637 | free_pages: | |
2638 | list_for_each_entry_safe(page, tmp, &pages, lru) { | |
c7aafc54 | 2639 | list_del_init(&page->lru); |
4c11d7ae SR |
2640 | __free_page(page); |
2641 | } | |
2642 | return -ENOMEM; | |
bc0c38d1 SR |
2643 | } |
2644 | ||
a98a3c3f SR |
2645 | static int trace_free_page(void) |
2646 | { | |
2647 | struct trace_array_cpu *data; | |
2648 | struct page *page; | |
2649 | struct list_head *p; | |
2650 | int i; | |
2651 | int ret = 0; | |
2652 | ||
2653 | /* free one page from each buffer */ | |
2654 | for_each_possible_cpu(i) { | |
2655 | data = global_trace.data[i]; | |
2656 | p = data->trace_pages.next; | |
2657 | if (p == &data->trace_pages) { | |
2658 | /* should never happen */ | |
2659 | WARN_ON(1); | |
2660 | tracing_disabled = 1; | |
2661 | ret = -1; | |
2662 | break; | |
2663 | } | |
2664 | page = list_entry(p, struct page, lru); | |
2665 | ClearPageLRU(page); | |
2666 | list_del(&page->lru); | |
2667 | __free_page(page); | |
2668 | ||
2669 | tracing_reset(data); | |
2670 | ||
2671 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2672 | data = max_tr.data[i]; | |
2673 | p = data->trace_pages.next; | |
2674 | if (p == &data->trace_pages) { | |
2675 | /* should never happen */ | |
2676 | WARN_ON(1); | |
2677 | tracing_disabled = 1; | |
2678 | ret = -1; | |
2679 | break; | |
2680 | } | |
2681 | page = list_entry(p, struct page, lru); | |
2682 | ClearPageLRU(page); | |
2683 | list_del(&page->lru); | |
2684 | __free_page(page); | |
2685 | ||
2686 | tracing_reset(data); | |
2687 | #endif | |
2688 | } | |
2689 | global_trace.entries -= ENTRIES_PER_PAGE; | |
2690 | ||
2691 | return ret; | |
2692 | } | |
2693 | ||
bc0c38d1 SR |
2694 | __init static int tracer_alloc_buffers(void) |
2695 | { | |
4c11d7ae SR |
2696 | struct trace_array_cpu *data; |
2697 | void *array; | |
2698 | struct page *page; | |
2699 | int pages = 0; | |
60a11774 | 2700 | int ret = -ENOMEM; |
bc0c38d1 SR |
2701 | int i; |
2702 | ||
26994ead SR |
2703 | global_trace.ctrl = tracer_enabled; |
2704 | ||
4c11d7ae | 2705 | /* Allocate the first page for all buffers */ |
bc0c38d1 | 2706 | for_each_possible_cpu(i) { |
4c11d7ae | 2707 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
bc0c38d1 SR |
2708 | max_tr.data[i] = &per_cpu(max_data, i); |
2709 | ||
4c11d7ae | 2710 | array = (void *)__get_free_page(GFP_KERNEL); |
bc0c38d1 | 2711 | if (array == NULL) { |
4c11d7ae SR |
2712 | printk(KERN_ERR "tracer: failed to allocate page" |
2713 | "for trace buffer!\n"); | |
bc0c38d1 SR |
2714 | goto free_buffers; |
2715 | } | |
4c11d7ae SR |
2716 | |
2717 | /* set the array to the list */ | |
2718 | INIT_LIST_HEAD(&data->trace_pages); | |
2719 | page = virt_to_page(array); | |
2720 | list_add(&page->lru, &data->trace_pages); | |
2721 | /* use the LRU flag to differentiate the two buffers */ | |
2722 | ClearPageLRU(page); | |
bc0c38d1 | 2723 | |
a98a3c3f SR |
2724 | data->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
2725 | max_tr.data[i]->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; | |
2726 | ||
bc0c38d1 SR |
2727 | /* Only allocate if we are actually using the max trace */ |
2728 | #ifdef CONFIG_TRACER_MAX_TRACE | |
4c11d7ae | 2729 | array = (void *)__get_free_page(GFP_KERNEL); |
bc0c38d1 | 2730 | if (array == NULL) { |
4c11d7ae SR |
2731 | printk(KERN_ERR "tracer: failed to allocate page" |
2732 | "for trace buffer!\n"); | |
bc0c38d1 SR |
2733 | goto free_buffers; |
2734 | } | |
4c11d7ae SR |
2735 | |
2736 | INIT_LIST_HEAD(&max_tr.data[i]->trace_pages); | |
2737 | page = virt_to_page(array); | |
2738 | list_add(&page->lru, &max_tr.data[i]->trace_pages); | |
2739 | SetPageLRU(page); | |
bc0c38d1 SR |
2740 | #endif |
2741 | } | |
2742 | ||
2743 | /* | |
2744 | * Since we allocate by orders of pages, we may be able to | |
2745 | * round up a bit. | |
2746 | */ | |
4c11d7ae | 2747 | global_trace.entries = ENTRIES_PER_PAGE; |
4c11d7ae SR |
2748 | pages++; |
2749 | ||
2750 | while (global_trace.entries < trace_nr_entries) { | |
2751 | if (trace_alloc_page()) | |
2752 | break; | |
2753 | pages++; | |
2754 | } | |
89b2f978 | 2755 | max_tr.entries = global_trace.entries; |
bc0c38d1 | 2756 | |
4c11d7ae SR |
2757 | pr_info("tracer: %d pages allocated for %ld", |
2758 | pages, trace_nr_entries); | |
bc0c38d1 SR |
2759 | pr_info(" entries of %ld bytes\n", (long)TRACE_ENTRY_SIZE); |
2760 | pr_info(" actual entries %ld\n", global_trace.entries); | |
2761 | ||
2762 | tracer_init_debugfs(); | |
2763 | ||
2764 | trace_init_cmdlines(); | |
2765 | ||
2766 | register_tracer(&no_tracer); | |
2767 | current_trace = &no_tracer; | |
2768 | ||
60a11774 SR |
2769 | /* All seems OK, enable tracing */ |
2770 | tracing_disabled = 0; | |
2771 | ||
bc0c38d1 SR |
2772 | return 0; |
2773 | ||
2774 | free_buffers: | |
2775 | for (i-- ; i >= 0; i--) { | |
4c11d7ae | 2776 | struct page *page, *tmp; |
bc0c38d1 SR |
2777 | struct trace_array_cpu *data = global_trace.data[i]; |
2778 | ||
c7aafc54 | 2779 | if (data) { |
4c11d7ae SR |
2780 | list_for_each_entry_safe(page, tmp, |
2781 | &data->trace_pages, lru) { | |
c7aafc54 | 2782 | list_del_init(&page->lru); |
4c11d7ae SR |
2783 | __free_page(page); |
2784 | } | |
bc0c38d1 SR |
2785 | } |
2786 | ||
2787 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2788 | data = max_tr.data[i]; | |
c7aafc54 | 2789 | if (data) { |
4c11d7ae SR |
2790 | list_for_each_entry_safe(page, tmp, |
2791 | &data->trace_pages, lru) { | |
c7aafc54 | 2792 | list_del_init(&page->lru); |
4c11d7ae SR |
2793 | __free_page(page); |
2794 | } | |
bc0c38d1 SR |
2795 | } |
2796 | #endif | |
2797 | } | |
60a11774 | 2798 | return ret; |
bc0c38d1 | 2799 | } |
60a11774 | 2800 | fs_initcall(tracer_alloc_buffers); |