Commit | Line | Data |
---|---|---|
bc0c38d1 SR |
1 | /* |
2 | * ring buffer based function tracer | |
3 | * | |
4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> | |
5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> | |
6 | * | |
7 | * Originally taken from the RT patch by: | |
8 | * Arnaldo Carvalho de Melo <acme@redhat.com> | |
9 | * | |
10 | * Based on code from the latency_tracer, that is: | |
11 | * Copyright (C) 2004-2006 Ingo Molnar | |
12 | * Copyright (C) 2004 William Lee Irwin III | |
13 | */ | |
14 | #include <linux/utsrelease.h> | |
15 | #include <linux/kallsyms.h> | |
16 | #include <linux/seq_file.h> | |
17 | #include <linux/debugfs.h> | |
4c11d7ae | 18 | #include <linux/pagemap.h> |
bc0c38d1 SR |
19 | #include <linux/hardirq.h> |
20 | #include <linux/linkage.h> | |
21 | #include <linux/uaccess.h> | |
22 | #include <linux/ftrace.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/percpu.h> | |
25 | #include <linux/ctype.h> | |
26 | #include <linux/init.h> | |
2a2cc8f7 | 27 | #include <linux/poll.h> |
bc0c38d1 SR |
28 | #include <linux/gfp.h> |
29 | #include <linux/fs.h> | |
30 | ||
86387f7e IM |
31 | #include <linux/stacktrace.h> |
32 | ||
bc0c38d1 SR |
33 | #include "trace.h" |
34 | ||
35 | unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX; | |
36 | unsigned long __read_mostly tracing_thresh; | |
37 | ||
a98a3c3f | 38 | /* dummy trace to disable tracing */ |
cffae437 | 39 | static struct tracer no_tracer __read_mostly = { |
a98a3c3f SR |
40 | .name = "none", |
41 | }; | |
42 | ||
43 | static int trace_alloc_page(void); | |
44 | static int trace_free_page(void); | |
45 | ||
60a11774 SR |
46 | static int tracing_disabled = 1; |
47 | ||
72829bc3 | 48 | long |
bc0c38d1 SR |
49 | ns2usecs(cycle_t nsec) |
50 | { | |
51 | nsec += 500; | |
52 | do_div(nsec, 1000); | |
53 | return nsec; | |
54 | } | |
55 | ||
e309b41d | 56 | cycle_t ftrace_now(int cpu) |
750ed1a4 | 57 | { |
0fd9e0da | 58 | return cpu_clock(cpu); |
750ed1a4 IM |
59 | } |
60 | ||
bc0c38d1 SR |
61 | static struct trace_array global_trace; |
62 | ||
63 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); | |
64 | ||
65 | static struct trace_array max_tr; | |
66 | ||
67 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); | |
68 | ||
26994ead | 69 | static int tracer_enabled = 1; |
57422797 | 70 | static unsigned long trace_nr_entries = 65536UL; |
bc0c38d1 SR |
71 | |
72 | static struct tracer *trace_types __read_mostly; | |
73 | static struct tracer *current_trace __read_mostly; | |
74 | static int max_tracer_type_len; | |
75 | ||
76 | static DEFINE_MUTEX(trace_types_lock); | |
4e655519 IM |
77 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
78 | ||
79 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT; | |
80 | ||
4e655519 IM |
81 | void trace_wake_up(void) |
82 | { | |
017730c1 IM |
83 | /* |
84 | * The runqueue_is_locked() can fail, but this is the best we | |
85 | * have for now: | |
86 | */ | |
87 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) | |
4e655519 IM |
88 | wake_up(&trace_wait); |
89 | } | |
bc0c38d1 | 90 | |
4c11d7ae SR |
91 | #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(struct trace_entry)) |
92 | ||
bc0c38d1 SR |
93 | static int __init set_nr_entries(char *str) |
94 | { | |
c6caeeb1 SR |
95 | unsigned long nr_entries; |
96 | int ret; | |
97 | ||
bc0c38d1 SR |
98 | if (!str) |
99 | return 0; | |
c6caeeb1 SR |
100 | ret = strict_strtoul(str, 0, &nr_entries); |
101 | /* nr_entries can not be zero */ | |
102 | if (ret < 0 || nr_entries == 0) | |
103 | return 0; | |
104 | trace_nr_entries = nr_entries; | |
bc0c38d1 SR |
105 | return 1; |
106 | } | |
107 | __setup("trace_entries=", set_nr_entries); | |
108 | ||
57f50be1 SR |
109 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
110 | { | |
111 | return nsecs / 1000; | |
112 | } | |
113 | ||
bc0c38d1 SR |
114 | enum trace_flag_type { |
115 | TRACE_FLAG_IRQS_OFF = 0x01, | |
116 | TRACE_FLAG_NEED_RESCHED = 0x02, | |
117 | TRACE_FLAG_HARDIRQ = 0x04, | |
118 | TRACE_FLAG_SOFTIRQ = 0x08, | |
119 | }; | |
120 | ||
bc0c38d1 SR |
121 | #define TRACE_ITER_SYM_MASK \ |
122 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
123 | ||
124 | /* These must match the bit postions above */ | |
125 | static const char *trace_options[] = { | |
126 | "print-parent", | |
127 | "sym-offset", | |
128 | "sym-addr", | |
129 | "verbose", | |
f9896bf3 | 130 | "raw", |
5e3ca0ec | 131 | "hex", |
cb0f12aa | 132 | "bin", |
2a2cc8f7 | 133 | "block", |
86387f7e | 134 | "stacktrace", |
4ac3ba41 | 135 | "sched-tree", |
bc0c38d1 SR |
136 | NULL |
137 | }; | |
138 | ||
92205c23 SR |
139 | static raw_spinlock_t ftrace_max_lock = |
140 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; | |
bc0c38d1 SR |
141 | |
142 | /* | |
143 | * Copy the new maximum trace into the separate maximum-trace | |
144 | * structure. (this way the maximum trace is permanently saved, | |
145 | * for later retrieval via /debugfs/tracing/latency_trace) | |
146 | */ | |
e309b41d | 147 | static void |
bc0c38d1 SR |
148 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
149 | { | |
150 | struct trace_array_cpu *data = tr->data[cpu]; | |
151 | ||
152 | max_tr.cpu = cpu; | |
153 | max_tr.time_start = data->preempt_timestamp; | |
154 | ||
155 | data = max_tr.data[cpu]; | |
156 | data->saved_latency = tracing_max_latency; | |
157 | ||
158 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); | |
159 | data->pid = tsk->pid; | |
160 | data->uid = tsk->uid; | |
161 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; | |
162 | data->policy = tsk->policy; | |
163 | data->rt_priority = tsk->rt_priority; | |
164 | ||
165 | /* record this tasks comm */ | |
166 | tracing_record_cmdline(current); | |
167 | } | |
168 | ||
c7aafc54 IM |
169 | void check_pages(struct trace_array_cpu *data) |
170 | { | |
171 | struct page *page, *tmp; | |
172 | ||
173 | BUG_ON(data->trace_pages.next->prev != &data->trace_pages); | |
174 | BUG_ON(data->trace_pages.prev->next != &data->trace_pages); | |
175 | ||
176 | list_for_each_entry_safe(page, tmp, &data->trace_pages, lru) { | |
177 | BUG_ON(page->lru.next->prev != &page->lru); | |
178 | BUG_ON(page->lru.prev->next != &page->lru); | |
179 | } | |
180 | } | |
181 | ||
182 | void *head_page(struct trace_array_cpu *data) | |
183 | { | |
184 | struct page *page; | |
185 | ||
186 | check_pages(data); | |
187 | if (list_empty(&data->trace_pages)) | |
188 | return NULL; | |
189 | ||
190 | page = list_entry(data->trace_pages.next, struct page, lru); | |
191 | BUG_ON(&page->lru == &data->trace_pages); | |
192 | ||
193 | return page_address(page); | |
194 | } | |
195 | ||
72829bc3 | 196 | int |
214023c3 SR |
197 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
198 | { | |
199 | int len = (PAGE_SIZE - 1) - s->len; | |
200 | va_list ap; | |
b3806b43 | 201 | int ret; |
214023c3 SR |
202 | |
203 | if (!len) | |
204 | return 0; | |
205 | ||
206 | va_start(ap, fmt); | |
b3806b43 | 207 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
214023c3 SR |
208 | va_end(ap); |
209 | ||
b3806b43 | 210 | /* If we can't write it all, don't bother writing anything */ |
72829bc3 | 211 | if (ret >= len) |
b3806b43 SR |
212 | return 0; |
213 | ||
214 | s->len += ret; | |
214023c3 SR |
215 | |
216 | return len; | |
217 | } | |
218 | ||
e309b41d | 219 | static int |
214023c3 SR |
220 | trace_seq_puts(struct trace_seq *s, const char *str) |
221 | { | |
222 | int len = strlen(str); | |
223 | ||
224 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
b3806b43 | 225 | return 0; |
214023c3 SR |
226 | |
227 | memcpy(s->buffer + s->len, str, len); | |
228 | s->len += len; | |
229 | ||
230 | return len; | |
231 | } | |
232 | ||
e309b41d | 233 | static int |
214023c3 SR |
234 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
235 | { | |
236 | if (s->len >= (PAGE_SIZE - 1)) | |
237 | return 0; | |
238 | ||
239 | s->buffer[s->len++] = c; | |
240 | ||
241 | return 1; | |
242 | } | |
243 | ||
e309b41d | 244 | static int |
cb0f12aa IM |
245 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
246 | { | |
247 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
248 | return 0; | |
249 | ||
250 | memcpy(s->buffer + s->len, mem, len); | |
251 | s->len += len; | |
252 | ||
253 | return len; | |
254 | } | |
255 | ||
5e3ca0ec | 256 | #define HEX_CHARS 17 |
93dcc6ea | 257 | static const char hex2asc[] = "0123456789abcdef"; |
5e3ca0ec | 258 | |
e309b41d | 259 | static int |
5e3ca0ec IM |
260 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
261 | { | |
262 | unsigned char hex[HEX_CHARS]; | |
93dcc6ea | 263 | unsigned char *data = mem; |
5e3ca0ec IM |
264 | unsigned char byte; |
265 | int i, j; | |
266 | ||
267 | BUG_ON(len >= HEX_CHARS); | |
268 | ||
5e3ca0ec IM |
269 | #ifdef __BIG_ENDIAN |
270 | for (i = 0, j = 0; i < len; i++) { | |
271 | #else | |
272 | for (i = len-1, j = 0; i >= 0; i--) { | |
273 | #endif | |
274 | byte = data[i]; | |
275 | ||
93dcc6ea TG |
276 | hex[j++] = hex2asc[byte & 0x0f]; |
277 | hex[j++] = hex2asc[byte >> 4]; | |
5e3ca0ec | 278 | } |
93dcc6ea | 279 | hex[j++] = ' '; |
5e3ca0ec IM |
280 | |
281 | return trace_seq_putmem(s, hex, j); | |
282 | } | |
283 | ||
e309b41d | 284 | static void |
214023c3 SR |
285 | trace_seq_reset(struct trace_seq *s) |
286 | { | |
287 | s->len = 0; | |
288 | } | |
289 | ||
e309b41d | 290 | static void |
214023c3 SR |
291 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
292 | { | |
293 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; | |
294 | ||
295 | s->buffer[len] = 0; | |
296 | seq_puts(m, s->buffer); | |
297 | ||
298 | trace_seq_reset(s); | |
299 | } | |
300 | ||
e309b41d | 301 | static void |
c7aafc54 IM |
302 | flip_trace(struct trace_array_cpu *tr1, struct trace_array_cpu *tr2) |
303 | { | |
304 | struct list_head flip_pages; | |
305 | ||
306 | INIT_LIST_HEAD(&flip_pages); | |
307 | ||
93a588f4 | 308 | memcpy(&tr1->trace_head_idx, &tr2->trace_head_idx, |
c7aafc54 | 309 | sizeof(struct trace_array_cpu) - |
93a588f4 | 310 | offsetof(struct trace_array_cpu, trace_head_idx)); |
c7aafc54 IM |
311 | |
312 | check_pages(tr1); | |
313 | check_pages(tr2); | |
314 | list_splice_init(&tr1->trace_pages, &flip_pages); | |
315 | list_splice_init(&tr2->trace_pages, &tr1->trace_pages); | |
316 | list_splice_init(&flip_pages, &tr2->trace_pages); | |
317 | BUG_ON(!list_empty(&flip_pages)); | |
318 | check_pages(tr1); | |
319 | check_pages(tr2); | |
320 | } | |
321 | ||
e309b41d | 322 | void |
bc0c38d1 SR |
323 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
324 | { | |
325 | struct trace_array_cpu *data; | |
bc0c38d1 SR |
326 | int i; |
327 | ||
4c11d7ae | 328 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 329 | __raw_spin_lock(&ftrace_max_lock); |
bc0c38d1 SR |
330 | /* clear out all the previous traces */ |
331 | for_each_possible_cpu(i) { | |
332 | data = tr->data[i]; | |
c7aafc54 | 333 | flip_trace(max_tr.data[i], data); |
89b2f978 | 334 | tracing_reset(data); |
bc0c38d1 SR |
335 | } |
336 | ||
337 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 338 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
339 | } |
340 | ||
341 | /** | |
342 | * update_max_tr_single - only copy one trace over, and reset the rest | |
343 | * @tr - tracer | |
344 | * @tsk - task with the latency | |
345 | * @cpu - the cpu of the buffer to copy. | |
346 | */ | |
e309b41d | 347 | void |
bc0c38d1 SR |
348 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
349 | { | |
350 | struct trace_array_cpu *data = tr->data[cpu]; | |
bc0c38d1 SR |
351 | int i; |
352 | ||
4c11d7ae | 353 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 354 | __raw_spin_lock(&ftrace_max_lock); |
bc0c38d1 SR |
355 | for_each_possible_cpu(i) |
356 | tracing_reset(max_tr.data[i]); | |
357 | ||
c7aafc54 | 358 | flip_trace(max_tr.data[cpu], data); |
89b2f978 | 359 | tracing_reset(data); |
bc0c38d1 SR |
360 | |
361 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 362 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
363 | } |
364 | ||
365 | int register_tracer(struct tracer *type) | |
366 | { | |
367 | struct tracer *t; | |
368 | int len; | |
369 | int ret = 0; | |
370 | ||
371 | if (!type->name) { | |
372 | pr_info("Tracer must have a name\n"); | |
373 | return -1; | |
374 | } | |
375 | ||
376 | mutex_lock(&trace_types_lock); | |
377 | for (t = trace_types; t; t = t->next) { | |
378 | if (strcmp(type->name, t->name) == 0) { | |
379 | /* already found */ | |
380 | pr_info("Trace %s already registered\n", | |
381 | type->name); | |
382 | ret = -1; | |
383 | goto out; | |
384 | } | |
385 | } | |
386 | ||
60a11774 SR |
387 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
388 | if (type->selftest) { | |
389 | struct tracer *saved_tracer = current_trace; | |
390 | struct trace_array_cpu *data; | |
391 | struct trace_array *tr = &global_trace; | |
392 | int saved_ctrl = tr->ctrl; | |
393 | int i; | |
394 | /* | |
395 | * Run a selftest on this tracer. | |
396 | * Here we reset the trace buffer, and set the current | |
397 | * tracer to be this tracer. The tracer can then run some | |
398 | * internal tracing to verify that everything is in order. | |
399 | * If we fail, we do not register this tracer. | |
400 | */ | |
401 | for_each_possible_cpu(i) { | |
60a11774 | 402 | data = tr->data[i]; |
c7aafc54 IM |
403 | if (!head_page(data)) |
404 | continue; | |
60a11774 SR |
405 | tracing_reset(data); |
406 | } | |
407 | current_trace = type; | |
408 | tr->ctrl = 0; | |
409 | /* the test is responsible for initializing and enabling */ | |
410 | pr_info("Testing tracer %s: ", type->name); | |
411 | ret = type->selftest(type, tr); | |
412 | /* the test is responsible for resetting too */ | |
413 | current_trace = saved_tracer; | |
414 | tr->ctrl = saved_ctrl; | |
415 | if (ret) { | |
416 | printk(KERN_CONT "FAILED!\n"); | |
417 | goto out; | |
418 | } | |
1d4db00a SR |
419 | /* Only reset on passing, to avoid touching corrupted buffers */ |
420 | for_each_possible_cpu(i) { | |
421 | data = tr->data[i]; | |
422 | if (!head_page(data)) | |
423 | continue; | |
424 | tracing_reset(data); | |
425 | } | |
60a11774 SR |
426 | printk(KERN_CONT "PASSED\n"); |
427 | } | |
428 | #endif | |
429 | ||
bc0c38d1 SR |
430 | type->next = trace_types; |
431 | trace_types = type; | |
432 | len = strlen(type->name); | |
433 | if (len > max_tracer_type_len) | |
434 | max_tracer_type_len = len; | |
60a11774 | 435 | |
bc0c38d1 SR |
436 | out: |
437 | mutex_unlock(&trace_types_lock); | |
438 | ||
439 | return ret; | |
440 | } | |
441 | ||
442 | void unregister_tracer(struct tracer *type) | |
443 | { | |
444 | struct tracer **t; | |
445 | int len; | |
446 | ||
447 | mutex_lock(&trace_types_lock); | |
448 | for (t = &trace_types; *t; t = &(*t)->next) { | |
449 | if (*t == type) | |
450 | goto found; | |
451 | } | |
452 | pr_info("Trace %s not registered\n", type->name); | |
453 | goto out; | |
454 | ||
455 | found: | |
456 | *t = (*t)->next; | |
457 | if (strlen(type->name) != max_tracer_type_len) | |
458 | goto out; | |
459 | ||
460 | max_tracer_type_len = 0; | |
461 | for (t = &trace_types; *t; t = &(*t)->next) { | |
462 | len = strlen((*t)->name); | |
463 | if (len > max_tracer_type_len) | |
464 | max_tracer_type_len = len; | |
465 | } | |
466 | out: | |
467 | mutex_unlock(&trace_types_lock); | |
468 | } | |
469 | ||
e309b41d | 470 | void tracing_reset(struct trace_array_cpu *data) |
bc0c38d1 SR |
471 | { |
472 | data->trace_idx = 0; | |
93a588f4 SR |
473 | data->trace_head = data->trace_tail = head_page(data); |
474 | data->trace_head_idx = 0; | |
475 | data->trace_tail_idx = 0; | |
bc0c38d1 SR |
476 | } |
477 | ||
bc0c38d1 SR |
478 | #define SAVED_CMDLINES 128 |
479 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; | |
480 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; | |
481 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; | |
482 | static int cmdline_idx; | |
483 | static DEFINE_SPINLOCK(trace_cmdline_lock); | |
484 | atomic_t trace_record_cmdline_disabled; | |
485 | ||
486 | static void trace_init_cmdlines(void) | |
487 | { | |
488 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); | |
489 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); | |
490 | cmdline_idx = 0; | |
491 | } | |
492 | ||
e309b41d | 493 | void trace_stop_cmdline_recording(void); |
bc0c38d1 | 494 | |
e309b41d | 495 | static void trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
496 | { |
497 | unsigned map; | |
498 | unsigned idx; | |
499 | ||
500 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
501 | return; | |
502 | ||
503 | /* | |
504 | * It's not the end of the world if we don't get | |
505 | * the lock, but we also don't want to spin | |
506 | * nor do we want to disable interrupts, | |
507 | * so if we miss here, then better luck next time. | |
508 | */ | |
509 | if (!spin_trylock(&trace_cmdline_lock)) | |
510 | return; | |
511 | ||
512 | idx = map_pid_to_cmdline[tsk->pid]; | |
513 | if (idx >= SAVED_CMDLINES) { | |
514 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; | |
515 | ||
516 | map = map_cmdline_to_pid[idx]; | |
517 | if (map <= PID_MAX_DEFAULT) | |
518 | map_pid_to_cmdline[map] = (unsigned)-1; | |
519 | ||
520 | map_pid_to_cmdline[tsk->pid] = idx; | |
521 | ||
522 | cmdline_idx = idx; | |
523 | } | |
524 | ||
525 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); | |
526 | ||
527 | spin_unlock(&trace_cmdline_lock); | |
528 | } | |
529 | ||
e309b41d | 530 | static char *trace_find_cmdline(int pid) |
bc0c38d1 SR |
531 | { |
532 | char *cmdline = "<...>"; | |
533 | unsigned map; | |
534 | ||
535 | if (!pid) | |
536 | return "<idle>"; | |
537 | ||
538 | if (pid > PID_MAX_DEFAULT) | |
539 | goto out; | |
540 | ||
541 | map = map_pid_to_cmdline[pid]; | |
542 | if (map >= SAVED_CMDLINES) | |
543 | goto out; | |
544 | ||
545 | cmdline = saved_cmdlines[map]; | |
546 | ||
547 | out: | |
548 | return cmdline; | |
549 | } | |
550 | ||
e309b41d | 551 | void tracing_record_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
552 | { |
553 | if (atomic_read(&trace_record_cmdline_disabled)) | |
554 | return; | |
555 | ||
556 | trace_save_cmdline(tsk); | |
557 | } | |
558 | ||
e309b41d | 559 | static inline struct list_head * |
93a588f4 SR |
560 | trace_next_list(struct trace_array_cpu *data, struct list_head *next) |
561 | { | |
562 | /* | |
563 | * Roundrobin - but skip the head (which is not a real page): | |
564 | */ | |
565 | next = next->next; | |
566 | if (unlikely(next == &data->trace_pages)) | |
567 | next = next->next; | |
568 | BUG_ON(next == &data->trace_pages); | |
569 | ||
570 | return next; | |
571 | } | |
572 | ||
e309b41d | 573 | static inline void * |
93a588f4 SR |
574 | trace_next_page(struct trace_array_cpu *data, void *addr) |
575 | { | |
576 | struct list_head *next; | |
577 | struct page *page; | |
578 | ||
579 | page = virt_to_page(addr); | |
580 | ||
581 | next = trace_next_list(data, &page->lru); | |
582 | page = list_entry(next, struct page, lru); | |
583 | ||
584 | return page_address(page); | |
585 | } | |
586 | ||
e309b41d | 587 | static inline struct trace_entry * |
c7aafc54 | 588 | tracing_get_trace_entry(struct trace_array *tr, struct trace_array_cpu *data) |
bc0c38d1 SR |
589 | { |
590 | unsigned long idx, idx_next; | |
591 | struct trace_entry *entry; | |
592 | ||
4c11d7ae | 593 | data->trace_idx++; |
93a588f4 | 594 | idx = data->trace_head_idx; |
bc0c38d1 SR |
595 | idx_next = idx + 1; |
596 | ||
c7aafc54 IM |
597 | BUG_ON(idx * TRACE_ENTRY_SIZE >= PAGE_SIZE); |
598 | ||
93a588f4 | 599 | entry = data->trace_head + idx * TRACE_ENTRY_SIZE; |
4c11d7ae SR |
600 | |
601 | if (unlikely(idx_next >= ENTRIES_PER_PAGE)) { | |
93a588f4 | 602 | data->trace_head = trace_next_page(data, data->trace_head); |
bc0c38d1 SR |
603 | idx_next = 0; |
604 | } | |
605 | ||
93a588f4 SR |
606 | if (data->trace_head == data->trace_tail && |
607 | idx_next == data->trace_tail_idx) { | |
608 | /* overrun */ | |
609 | data->trace_tail_idx++; | |
610 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { | |
611 | data->trace_tail = | |
612 | trace_next_page(data, data->trace_tail); | |
613 | data->trace_tail_idx = 0; | |
614 | } | |
615 | } | |
616 | ||
617 | data->trace_head_idx = idx_next; | |
bc0c38d1 SR |
618 | |
619 | return entry; | |
620 | } | |
621 | ||
e309b41d | 622 | static inline void |
c7aafc54 | 623 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags) |
bc0c38d1 SR |
624 | { |
625 | struct task_struct *tsk = current; | |
626 | unsigned long pc; | |
627 | ||
628 | pc = preempt_count(); | |
629 | ||
c7aafc54 | 630 | entry->preempt_count = pc & 0xff; |
72829bc3 | 631 | entry->pid = (tsk) ? tsk->pid : 0; |
750ed1a4 | 632 | entry->t = ftrace_now(raw_smp_processor_id()); |
bc0c38d1 SR |
633 | entry->flags = (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
634 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | | |
635 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | | |
636 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); | |
637 | } | |
638 | ||
e309b41d | 639 | void |
6fb44b71 SR |
640 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
641 | unsigned long ip, unsigned long parent_ip, unsigned long flags) | |
bc0c38d1 SR |
642 | { |
643 | struct trace_entry *entry; | |
dcb6308f | 644 | unsigned long irq_flags; |
bc0c38d1 | 645 | |
92205c23 SR |
646 | raw_local_irq_save(irq_flags); |
647 | __raw_spin_lock(&data->lock); | |
c7aafc54 | 648 | entry = tracing_get_trace_entry(tr, data); |
bc0c38d1 | 649 | tracing_generic_entry_update(entry, flags); |
c7aafc54 IM |
650 | entry->type = TRACE_FN; |
651 | entry->fn.ip = ip; | |
652 | entry->fn.parent_ip = parent_ip; | |
92205c23 SR |
653 | __raw_spin_unlock(&data->lock); |
654 | raw_local_irq_restore(irq_flags); | |
bc0c38d1 SR |
655 | } |
656 | ||
e309b41d | 657 | void |
2e0f5761 IM |
658 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
659 | unsigned long ip, unsigned long parent_ip, unsigned long flags) | |
660 | { | |
661 | if (likely(!atomic_read(&data->disabled))) | |
6fb44b71 | 662 | trace_function(tr, data, ip, parent_ip, flags); |
2e0f5761 IM |
663 | } |
664 | ||
e309b41d | 665 | void |
4e655519 IM |
666 | __trace_special(void *__tr, void *__data, |
667 | unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
f0a920d5 | 668 | { |
4e655519 IM |
669 | struct trace_array_cpu *data = __data; |
670 | struct trace_array *tr = __tr; | |
f0a920d5 | 671 | struct trace_entry *entry; |
dcb6308f | 672 | unsigned long irq_flags; |
f0a920d5 | 673 | |
92205c23 SR |
674 | raw_local_irq_save(irq_flags); |
675 | __raw_spin_lock(&data->lock); | |
f0a920d5 IM |
676 | entry = tracing_get_trace_entry(tr, data); |
677 | tracing_generic_entry_update(entry, 0); | |
678 | entry->type = TRACE_SPECIAL; | |
679 | entry->special.arg1 = arg1; | |
680 | entry->special.arg2 = arg2; | |
681 | entry->special.arg3 = arg3; | |
92205c23 SR |
682 | __raw_spin_unlock(&data->lock); |
683 | raw_local_irq_restore(irq_flags); | |
017730c1 IM |
684 | |
685 | trace_wake_up(); | |
86387f7e IM |
686 | } |
687 | ||
688 | void __trace_stack(struct trace_array *tr, | |
689 | struct trace_array_cpu *data, | |
690 | unsigned long flags, | |
691 | int skip) | |
692 | { | |
693 | struct trace_entry *entry; | |
694 | struct stack_trace trace; | |
695 | ||
696 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) | |
697 | return; | |
698 | ||
699 | entry = tracing_get_trace_entry(tr, data); | |
700 | tracing_generic_entry_update(entry, flags); | |
701 | entry->type = TRACE_STACK; | |
702 | ||
703 | memset(&entry->stack, 0, sizeof(entry->stack)); | |
704 | ||
705 | trace.nr_entries = 0; | |
706 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
707 | trace.skip = skip; | |
708 | trace.entries = entry->stack.caller; | |
709 | ||
710 | save_stack_trace(&trace); | |
f0a920d5 IM |
711 | } |
712 | ||
e309b41d | 713 | void |
bc0c38d1 SR |
714 | tracing_sched_switch_trace(struct trace_array *tr, |
715 | struct trace_array_cpu *data, | |
86387f7e IM |
716 | struct task_struct *prev, |
717 | struct task_struct *next, | |
bc0c38d1 SR |
718 | unsigned long flags) |
719 | { | |
720 | struct trace_entry *entry; | |
dcb6308f | 721 | unsigned long irq_flags; |
bc0c38d1 | 722 | |
92205c23 SR |
723 | raw_local_irq_save(irq_flags); |
724 | __raw_spin_lock(&data->lock); | |
c7aafc54 | 725 | entry = tracing_get_trace_entry(tr, data); |
bc0c38d1 SR |
726 | tracing_generic_entry_update(entry, flags); |
727 | entry->type = TRACE_CTX; | |
728 | entry->ctx.prev_pid = prev->pid; | |
729 | entry->ctx.prev_prio = prev->prio; | |
730 | entry->ctx.prev_state = prev->state; | |
731 | entry->ctx.next_pid = next->pid; | |
732 | entry->ctx.next_prio = next->prio; | |
bac524d3 | 733 | entry->ctx.next_state = next->state; |
86387f7e | 734 | __trace_stack(tr, data, flags, 4); |
92205c23 SR |
735 | __raw_spin_unlock(&data->lock); |
736 | raw_local_irq_restore(irq_flags); | |
bc0c38d1 SR |
737 | } |
738 | ||
57422797 IM |
739 | void |
740 | tracing_sched_wakeup_trace(struct trace_array *tr, | |
741 | struct trace_array_cpu *data, | |
86387f7e IM |
742 | struct task_struct *wakee, |
743 | struct task_struct *curr, | |
57422797 IM |
744 | unsigned long flags) |
745 | { | |
746 | struct trace_entry *entry; | |
747 | unsigned long irq_flags; | |
748 | ||
92205c23 SR |
749 | raw_local_irq_save(irq_flags); |
750 | __raw_spin_lock(&data->lock); | |
57422797 IM |
751 | entry = tracing_get_trace_entry(tr, data); |
752 | tracing_generic_entry_update(entry, flags); | |
753 | entry->type = TRACE_WAKE; | |
754 | entry->ctx.prev_pid = curr->pid; | |
755 | entry->ctx.prev_prio = curr->prio; | |
756 | entry->ctx.prev_state = curr->state; | |
757 | entry->ctx.next_pid = wakee->pid; | |
758 | entry->ctx.next_prio = wakee->prio; | |
bac524d3 | 759 | entry->ctx.next_state = wakee->state; |
86387f7e | 760 | __trace_stack(tr, data, flags, 5); |
92205c23 SR |
761 | __raw_spin_unlock(&data->lock); |
762 | raw_local_irq_restore(irq_flags); | |
017730c1 IM |
763 | |
764 | trace_wake_up(); | |
57422797 IM |
765 | } |
766 | ||
2e0f5761 | 767 | #ifdef CONFIG_FTRACE |
e309b41d | 768 | static void |
2e0f5761 IM |
769 | function_trace_call(unsigned long ip, unsigned long parent_ip) |
770 | { | |
771 | struct trace_array *tr = &global_trace; | |
772 | struct trace_array_cpu *data; | |
773 | unsigned long flags; | |
774 | long disabled; | |
775 | int cpu; | |
776 | ||
777 | if (unlikely(!tracer_enabled)) | |
778 | return; | |
779 | ||
780 | local_irq_save(flags); | |
781 | cpu = raw_smp_processor_id(); | |
782 | data = tr->data[cpu]; | |
783 | disabled = atomic_inc_return(&data->disabled); | |
784 | ||
785 | if (likely(disabled == 1)) | |
6fb44b71 | 786 | trace_function(tr, data, ip, parent_ip, flags); |
2e0f5761 IM |
787 | |
788 | atomic_dec(&data->disabled); | |
789 | local_irq_restore(flags); | |
790 | } | |
791 | ||
792 | static struct ftrace_ops trace_ops __read_mostly = | |
793 | { | |
794 | .func = function_trace_call, | |
795 | }; | |
796 | ||
e309b41d | 797 | void tracing_start_function_trace(void) |
2e0f5761 IM |
798 | { |
799 | register_ftrace_function(&trace_ops); | |
800 | } | |
801 | ||
e309b41d | 802 | void tracing_stop_function_trace(void) |
2e0f5761 IM |
803 | { |
804 | unregister_ftrace_function(&trace_ops); | |
805 | } | |
806 | #endif | |
807 | ||
bc0c38d1 SR |
808 | enum trace_file_type { |
809 | TRACE_FILE_LAT_FMT = 1, | |
810 | }; | |
811 | ||
812 | static struct trace_entry * | |
4c11d7ae SR |
813 | trace_entry_idx(struct trace_array *tr, struct trace_array_cpu *data, |
814 | struct trace_iterator *iter, int cpu) | |
bc0c38d1 | 815 | { |
4c11d7ae SR |
816 | struct page *page; |
817 | struct trace_entry *array; | |
bc0c38d1 | 818 | |
4c11d7ae | 819 | if (iter->next_idx[cpu] >= tr->entries || |
b3806b43 SR |
820 | iter->next_idx[cpu] >= data->trace_idx || |
821 | (data->trace_head == data->trace_tail && | |
822 | data->trace_head_idx == data->trace_tail_idx)) | |
bc0c38d1 SR |
823 | return NULL; |
824 | ||
4c11d7ae | 825 | if (!iter->next_page[cpu]) { |
93a588f4 SR |
826 | /* Initialize the iterator for this cpu trace buffer */ |
827 | WARN_ON(!data->trace_tail); | |
828 | page = virt_to_page(data->trace_tail); | |
829 | iter->next_page[cpu] = &page->lru; | |
830 | iter->next_page_idx[cpu] = data->trace_tail_idx; | |
4c11d7ae | 831 | } |
bc0c38d1 | 832 | |
4c11d7ae | 833 | page = list_entry(iter->next_page[cpu], struct page, lru); |
c7aafc54 IM |
834 | BUG_ON(&data->trace_pages == &page->lru); |
835 | ||
4c11d7ae SR |
836 | array = page_address(page); |
837 | ||
93a588f4 | 838 | WARN_ON(iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE); |
4c11d7ae | 839 | return &array[iter->next_page_idx[cpu]]; |
bc0c38d1 SR |
840 | } |
841 | ||
e309b41d | 842 | static struct trace_entry * |
bc0c38d1 SR |
843 | find_next_entry(struct trace_iterator *iter, int *ent_cpu) |
844 | { | |
845 | struct trace_array *tr = iter->tr; | |
846 | struct trace_entry *ent, *next = NULL; | |
847 | int next_cpu = -1; | |
848 | int cpu; | |
849 | ||
850 | for_each_possible_cpu(cpu) { | |
c7aafc54 | 851 | if (!head_page(tr->data[cpu])) |
bc0c38d1 | 852 | continue; |
4c11d7ae | 853 | ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); |
cdd31cd2 IM |
854 | /* |
855 | * Pick the entry with the smallest timestamp: | |
856 | */ | |
857 | if (ent && (!next || ent->t < next->t)) { | |
bc0c38d1 SR |
858 | next = ent; |
859 | next_cpu = cpu; | |
860 | } | |
861 | } | |
862 | ||
863 | if (ent_cpu) | |
864 | *ent_cpu = next_cpu; | |
865 | ||
866 | return next; | |
867 | } | |
868 | ||
e309b41d | 869 | static void trace_iterator_increment(struct trace_iterator *iter) |
bc0c38d1 | 870 | { |
b3806b43 SR |
871 | iter->idx++; |
872 | iter->next_idx[iter->cpu]++; | |
873 | iter->next_page_idx[iter->cpu]++; | |
8c523a9d | 874 | |
b3806b43 SR |
875 | if (iter->next_page_idx[iter->cpu] >= ENTRIES_PER_PAGE) { |
876 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; | |
bc0c38d1 | 877 | |
b3806b43 SR |
878 | iter->next_page_idx[iter->cpu] = 0; |
879 | iter->next_page[iter->cpu] = | |
880 | trace_next_list(data, iter->next_page[iter->cpu]); | |
881 | } | |
882 | } | |
bc0c38d1 | 883 | |
e309b41d | 884 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 SR |
885 | { |
886 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; | |
887 | ||
888 | data->trace_tail_idx++; | |
889 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { | |
890 | data->trace_tail = trace_next_page(data, data->trace_tail); | |
891 | data->trace_tail_idx = 0; | |
892 | } | |
4e3c3333 | 893 | |
b3806b43 SR |
894 | /* Check if we empty it, then reset the index */ |
895 | if (data->trace_head == data->trace_tail && | |
896 | data->trace_head_idx == data->trace_tail_idx) | |
897 | data->trace_idx = 0; | |
b3806b43 SR |
898 | } |
899 | ||
e309b41d | 900 | static void *find_next_entry_inc(struct trace_iterator *iter) |
b3806b43 SR |
901 | { |
902 | struct trace_entry *next; | |
903 | int next_cpu = -1; | |
904 | ||
905 | next = find_next_entry(iter, &next_cpu); | |
93a588f4 | 906 | |
4e3c3333 IM |
907 | iter->prev_ent = iter->ent; |
908 | iter->prev_cpu = iter->cpu; | |
909 | ||
bc0c38d1 SR |
910 | iter->ent = next; |
911 | iter->cpu = next_cpu; | |
912 | ||
b3806b43 SR |
913 | if (next) |
914 | trace_iterator_increment(iter); | |
915 | ||
bc0c38d1 SR |
916 | return next ? iter : NULL; |
917 | } | |
918 | ||
e309b41d | 919 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
920 | { |
921 | struct trace_iterator *iter = m->private; | |
bc0c38d1 SR |
922 | void *last_ent = iter->ent; |
923 | int i = (int)*pos; | |
4e3c3333 | 924 | void *ent; |
bc0c38d1 SR |
925 | |
926 | (*pos)++; | |
927 | ||
928 | /* can't go backwards */ | |
929 | if (iter->idx > i) | |
930 | return NULL; | |
931 | ||
932 | if (iter->idx < 0) | |
933 | ent = find_next_entry_inc(iter); | |
934 | else | |
935 | ent = iter; | |
936 | ||
937 | while (ent && iter->idx < i) | |
938 | ent = find_next_entry_inc(iter); | |
939 | ||
940 | iter->pos = *pos; | |
941 | ||
942 | if (last_ent && !ent) | |
943 | seq_puts(m, "\n\nvim:ft=help\n"); | |
944 | ||
945 | return ent; | |
946 | } | |
947 | ||
948 | static void *s_start(struct seq_file *m, loff_t *pos) | |
949 | { | |
950 | struct trace_iterator *iter = m->private; | |
951 | void *p = NULL; | |
952 | loff_t l = 0; | |
953 | int i; | |
954 | ||
955 | mutex_lock(&trace_types_lock); | |
956 | ||
d15f57f2 SR |
957 | if (!current_trace || current_trace != iter->trace) { |
958 | mutex_unlock(&trace_types_lock); | |
bc0c38d1 | 959 | return NULL; |
d15f57f2 | 960 | } |
bc0c38d1 SR |
961 | |
962 | atomic_inc(&trace_record_cmdline_disabled); | |
963 | ||
964 | /* let the tracer grab locks here if needed */ | |
965 | if (current_trace->start) | |
966 | current_trace->start(iter); | |
967 | ||
968 | if (*pos != iter->pos) { | |
969 | iter->ent = NULL; | |
970 | iter->cpu = 0; | |
971 | iter->idx = -1; | |
4e3c3333 IM |
972 | iter->prev_ent = NULL; |
973 | iter->prev_cpu = -1; | |
bc0c38d1 | 974 | |
4c11d7ae | 975 | for_each_possible_cpu(i) { |
bc0c38d1 | 976 | iter->next_idx[i] = 0; |
4c11d7ae SR |
977 | iter->next_page[i] = NULL; |
978 | } | |
bc0c38d1 SR |
979 | |
980 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) | |
981 | ; | |
982 | ||
983 | } else { | |
4c11d7ae | 984 | l = *pos - 1; |
bc0c38d1 SR |
985 | p = s_next(m, p, &l); |
986 | } | |
987 | ||
988 | return p; | |
989 | } | |
990 | ||
991 | static void s_stop(struct seq_file *m, void *p) | |
992 | { | |
993 | struct trace_iterator *iter = m->private; | |
994 | ||
995 | atomic_dec(&trace_record_cmdline_disabled); | |
996 | ||
997 | /* let the tracer release locks here if needed */ | |
998 | if (current_trace && current_trace == iter->trace && iter->trace->stop) | |
999 | iter->trace->stop(iter); | |
1000 | ||
1001 | mutex_unlock(&trace_types_lock); | |
1002 | } | |
1003 | ||
b3806b43 | 1004 | static int |
214023c3 | 1005 | seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) |
bc0c38d1 SR |
1006 | { |
1007 | #ifdef CONFIG_KALLSYMS | |
1008 | char str[KSYM_SYMBOL_LEN]; | |
1009 | ||
1010 | kallsyms_lookup(address, NULL, NULL, NULL, str); | |
1011 | ||
b3806b43 | 1012 | return trace_seq_printf(s, fmt, str); |
bc0c38d1 | 1013 | #endif |
b3806b43 | 1014 | return 1; |
bc0c38d1 SR |
1015 | } |
1016 | ||
b3806b43 | 1017 | static int |
214023c3 SR |
1018 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
1019 | unsigned long address) | |
bc0c38d1 SR |
1020 | { |
1021 | #ifdef CONFIG_KALLSYMS | |
1022 | char str[KSYM_SYMBOL_LEN]; | |
1023 | ||
1024 | sprint_symbol(str, address); | |
b3806b43 | 1025 | return trace_seq_printf(s, fmt, str); |
bc0c38d1 | 1026 | #endif |
b3806b43 | 1027 | return 1; |
bc0c38d1 SR |
1028 | } |
1029 | ||
1030 | #ifndef CONFIG_64BIT | |
1031 | # define IP_FMT "%08lx" | |
1032 | #else | |
1033 | # define IP_FMT "%016lx" | |
1034 | #endif | |
1035 | ||
e309b41d | 1036 | static int |
214023c3 | 1037 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) |
bc0c38d1 | 1038 | { |
b3806b43 SR |
1039 | int ret; |
1040 | ||
1041 | if (!ip) | |
1042 | return trace_seq_printf(s, "0"); | |
bc0c38d1 SR |
1043 | |
1044 | if (sym_flags & TRACE_ITER_SYM_OFFSET) | |
b3806b43 | 1045 | ret = seq_print_sym_offset(s, "%s", ip); |
bc0c38d1 | 1046 | else |
b3806b43 SR |
1047 | ret = seq_print_sym_short(s, "%s", ip); |
1048 | ||
1049 | if (!ret) | |
1050 | return 0; | |
bc0c38d1 SR |
1051 | |
1052 | if (sym_flags & TRACE_ITER_SYM_ADDR) | |
b3806b43 SR |
1053 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
1054 | return ret; | |
bc0c38d1 SR |
1055 | } |
1056 | ||
e309b41d | 1057 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 SR |
1058 | { |
1059 | seq_puts(m, "# _------=> CPU# \n"); | |
1060 | seq_puts(m, "# / _-----=> irqs-off \n"); | |
1061 | seq_puts(m, "# | / _----=> need-resched \n"); | |
1062 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); | |
1063 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); | |
1064 | seq_puts(m, "# |||| / \n"); | |
1065 | seq_puts(m, "# ||||| delay \n"); | |
1066 | seq_puts(m, "# cmd pid ||||| time | caller \n"); | |
1067 | seq_puts(m, "# \\ / ||||| \\ | / \n"); | |
1068 | } | |
1069 | ||
e309b41d | 1070 | static void print_func_help_header(struct seq_file *m) |
bc0c38d1 SR |
1071 | { |
1072 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); | |
1073 | seq_puts(m, "# | | | | |\n"); | |
1074 | } | |
1075 | ||
1076 | ||
e309b41d | 1077 | static void |
bc0c38d1 SR |
1078 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
1079 | { | |
1080 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); | |
1081 | struct trace_array *tr = iter->tr; | |
1082 | struct trace_array_cpu *data = tr->data[tr->cpu]; | |
1083 | struct tracer *type = current_trace; | |
4c11d7ae SR |
1084 | unsigned long total = 0; |
1085 | unsigned long entries = 0; | |
bc0c38d1 SR |
1086 | int cpu; |
1087 | const char *name = "preemption"; | |
1088 | ||
1089 | if (type) | |
1090 | name = type->name; | |
1091 | ||
1092 | for_each_possible_cpu(cpu) { | |
c7aafc54 | 1093 | if (head_page(tr->data[cpu])) { |
4c11d7ae SR |
1094 | total += tr->data[cpu]->trace_idx; |
1095 | if (tr->data[cpu]->trace_idx > tr->entries) | |
bc0c38d1 | 1096 | entries += tr->entries; |
4c11d7ae | 1097 | else |
bc0c38d1 SR |
1098 | entries += tr->data[cpu]->trace_idx; |
1099 | } | |
1100 | } | |
1101 | ||
1102 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", | |
1103 | name, UTS_RELEASE); | |
1104 | seq_puts(m, "-----------------------------------" | |
1105 | "---------------------------------\n"); | |
1106 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" | |
1107 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", | |
57f50be1 | 1108 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 1109 | entries, |
4c11d7ae | 1110 | total, |
bc0c38d1 SR |
1111 | tr->cpu, |
1112 | #if defined(CONFIG_PREEMPT_NONE) | |
1113 | "server", | |
1114 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
1115 | "desktop", | |
1116 | #elif defined(CONFIG_PREEMPT_DESKTOP) | |
1117 | "preempt", | |
1118 | #else | |
1119 | "unknown", | |
1120 | #endif | |
1121 | /* These are reserved for later use */ | |
1122 | 0, 0, 0, 0); | |
1123 | #ifdef CONFIG_SMP | |
1124 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
1125 | #else | |
1126 | seq_puts(m, ")\n"); | |
1127 | #endif | |
1128 | seq_puts(m, " -----------------\n"); | |
1129 | seq_printf(m, " | task: %.16s-%d " | |
1130 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", | |
1131 | data->comm, data->pid, data->uid, data->nice, | |
1132 | data->policy, data->rt_priority); | |
1133 | seq_puts(m, " -----------------\n"); | |
1134 | ||
1135 | if (data->critical_start) { | |
1136 | seq_puts(m, " => started at: "); | |
214023c3 SR |
1137 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
1138 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 | 1139 | seq_puts(m, "\n => ended at: "); |
214023c3 SR |
1140 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
1141 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 SR |
1142 | seq_puts(m, "\n"); |
1143 | } | |
1144 | ||
1145 | seq_puts(m, "\n"); | |
1146 | } | |
1147 | ||
e309b41d | 1148 | static void |
214023c3 | 1149 | lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) |
bc0c38d1 SR |
1150 | { |
1151 | int hardirq, softirq; | |
1152 | char *comm; | |
1153 | ||
1154 | comm = trace_find_cmdline(entry->pid); | |
1155 | ||
214023c3 SR |
1156 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
1157 | trace_seq_printf(s, "%d", cpu); | |
1158 | trace_seq_printf(s, "%c%c", | |
1159 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.', | |
1160 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); | |
bc0c38d1 SR |
1161 | |
1162 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; | |
1163 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; | |
afc2abc0 | 1164 | if (hardirq && softirq) { |
214023c3 | 1165 | trace_seq_putc(s, 'H'); |
afc2abc0 IM |
1166 | } else { |
1167 | if (hardirq) { | |
214023c3 | 1168 | trace_seq_putc(s, 'h'); |
afc2abc0 | 1169 | } else { |
bc0c38d1 | 1170 | if (softirq) |
214023c3 | 1171 | trace_seq_putc(s, 's'); |
bc0c38d1 | 1172 | else |
214023c3 | 1173 | trace_seq_putc(s, '.'); |
bc0c38d1 SR |
1174 | } |
1175 | } | |
1176 | ||
1177 | if (entry->preempt_count) | |
214023c3 | 1178 | trace_seq_printf(s, "%x", entry->preempt_count); |
bc0c38d1 | 1179 | else |
214023c3 | 1180 | trace_seq_puts(s, "."); |
bc0c38d1 SR |
1181 | } |
1182 | ||
1183 | unsigned long preempt_mark_thresh = 100; | |
1184 | ||
e309b41d | 1185 | static void |
214023c3 | 1186 | lat_print_timestamp(struct trace_seq *s, unsigned long long abs_usecs, |
bc0c38d1 SR |
1187 | unsigned long rel_usecs) |
1188 | { | |
214023c3 | 1189 | trace_seq_printf(s, " %4lldus", abs_usecs); |
bc0c38d1 | 1190 | if (rel_usecs > preempt_mark_thresh) |
214023c3 | 1191 | trace_seq_puts(s, "!: "); |
bc0c38d1 | 1192 | else if (rel_usecs > 1) |
214023c3 | 1193 | trace_seq_puts(s, "+: "); |
bc0c38d1 | 1194 | else |
214023c3 | 1195 | trace_seq_puts(s, " : "); |
bc0c38d1 SR |
1196 | } |
1197 | ||
1198 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; | |
1199 | ||
e309b41d | 1200 | static int |
214023c3 | 1201 | print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) |
bc0c38d1 | 1202 | { |
214023c3 | 1203 | struct trace_seq *s = &iter->seq; |
bc0c38d1 SR |
1204 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
1205 | struct trace_entry *next_entry = find_next_entry(iter, NULL); | |
1206 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); | |
1207 | struct trace_entry *entry = iter->ent; | |
1208 | unsigned long abs_usecs; | |
1209 | unsigned long rel_usecs; | |
1210 | char *comm; | |
bac524d3 | 1211 | int S, T; |
86387f7e | 1212 | int i; |
d17d9691 | 1213 | unsigned state; |
bc0c38d1 SR |
1214 | |
1215 | if (!next_entry) | |
1216 | next_entry = entry; | |
1217 | rel_usecs = ns2usecs(next_entry->t - entry->t); | |
1218 | abs_usecs = ns2usecs(entry->t - iter->tr->time_start); | |
1219 | ||
1220 | if (verbose) { | |
1221 | comm = trace_find_cmdline(entry->pid); | |
214023c3 SR |
1222 | trace_seq_printf(s, "%16s %5d %d %d %08x %08x [%08lx]" |
1223 | " %ld.%03ldms (+%ld.%03ldms): ", | |
1224 | comm, | |
1225 | entry->pid, cpu, entry->flags, | |
1226 | entry->preempt_count, trace_idx, | |
1227 | ns2usecs(entry->t), | |
1228 | abs_usecs/1000, | |
1229 | abs_usecs % 1000, rel_usecs/1000, | |
1230 | rel_usecs % 1000); | |
bc0c38d1 | 1231 | } else { |
f29c73fe IM |
1232 | lat_print_generic(s, entry, cpu); |
1233 | lat_print_timestamp(s, abs_usecs, rel_usecs); | |
bc0c38d1 SR |
1234 | } |
1235 | switch (entry->type) { | |
1236 | case TRACE_FN: | |
214023c3 SR |
1237 | seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
1238 | trace_seq_puts(s, " ("); | |
1239 | seq_print_ip_sym(s, entry->fn.parent_ip, sym_flags); | |
1240 | trace_seq_puts(s, ")\n"); | |
bc0c38d1 SR |
1241 | break; |
1242 | case TRACE_CTX: | |
57422797 | 1243 | case TRACE_WAKE: |
bac524d3 PZ |
1244 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
1245 | state_to_char[entry->ctx.next_state] : 'X'; | |
1246 | ||
d17d9691 AG |
1247 | state = entry->ctx.prev_state ? __ffs(entry->ctx.prev_state) + 1 : 0; |
1248 | S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X'; | |
bc0c38d1 | 1249 | comm = trace_find_cmdline(entry->ctx.next_pid); |
bac524d3 | 1250 | trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d:%c %s\n", |
214023c3 SR |
1251 | entry->ctx.prev_pid, |
1252 | entry->ctx.prev_prio, | |
57422797 | 1253 | S, entry->type == TRACE_CTX ? "==>" : " +", |
214023c3 SR |
1254 | entry->ctx.next_pid, |
1255 | entry->ctx.next_prio, | |
bac524d3 | 1256 | T, comm); |
bc0c38d1 | 1257 | break; |
f0a920d5 | 1258 | case TRACE_SPECIAL: |
88a4216c | 1259 | trace_seq_printf(s, "# %ld %ld %ld\n", |
f0a920d5 IM |
1260 | entry->special.arg1, |
1261 | entry->special.arg2, | |
1262 | entry->special.arg3); | |
1263 | break; | |
86387f7e IM |
1264 | case TRACE_STACK: |
1265 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { | |
1266 | if (i) | |
1267 | trace_seq_puts(s, " <= "); | |
1268 | seq_print_ip_sym(s, entry->stack.caller[i], sym_flags); | |
1269 | } | |
1270 | trace_seq_puts(s, "\n"); | |
1271 | break; | |
89b2f978 | 1272 | default: |
214023c3 | 1273 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
bc0c38d1 | 1274 | } |
f9896bf3 | 1275 | return 1; |
bc0c38d1 SR |
1276 | } |
1277 | ||
e309b41d | 1278 | static int print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 1279 | { |
214023c3 | 1280 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1281 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 1282 | struct trace_entry *entry; |
bc0c38d1 SR |
1283 | unsigned long usec_rem; |
1284 | unsigned long long t; | |
1285 | unsigned long secs; | |
1286 | char *comm; | |
b3806b43 | 1287 | int ret; |
bac524d3 | 1288 | int S, T; |
86387f7e | 1289 | int i; |
bc0c38d1 | 1290 | |
4e3c3333 IM |
1291 | entry = iter->ent; |
1292 | ||
bc0c38d1 SR |
1293 | comm = trace_find_cmdline(iter->ent->pid); |
1294 | ||
cdd31cd2 | 1295 | t = ns2usecs(entry->t); |
bc0c38d1 SR |
1296 | usec_rem = do_div(t, 1000000ULL); |
1297 | secs = (unsigned long)t; | |
1298 | ||
f29c73fe IM |
1299 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
1300 | if (!ret) | |
1301 | return 0; | |
1302 | ret = trace_seq_printf(s, "[%02d] ", iter->cpu); | |
1303 | if (!ret) | |
1304 | return 0; | |
1305 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); | |
1306 | if (!ret) | |
1307 | return 0; | |
bc0c38d1 SR |
1308 | |
1309 | switch (entry->type) { | |
1310 | case TRACE_FN: | |
b3806b43 SR |
1311 | ret = seq_print_ip_sym(s, entry->fn.ip, sym_flags); |
1312 | if (!ret) | |
1313 | return 0; | |
bc0c38d1 SR |
1314 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
1315 | entry->fn.parent_ip) { | |
b3806b43 SR |
1316 | ret = trace_seq_printf(s, " <-"); |
1317 | if (!ret) | |
1318 | return 0; | |
1319 | ret = seq_print_ip_sym(s, entry->fn.parent_ip, | |
1320 | sym_flags); | |
1321 | if (!ret) | |
1322 | return 0; | |
bc0c38d1 | 1323 | } |
b3806b43 SR |
1324 | ret = trace_seq_printf(s, "\n"); |
1325 | if (!ret) | |
1326 | return 0; | |
bc0c38d1 SR |
1327 | break; |
1328 | case TRACE_CTX: | |
57422797 | 1329 | case TRACE_WAKE: |
bc0c38d1 SR |
1330 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
1331 | state_to_char[entry->ctx.prev_state] : 'X'; | |
bac524d3 PZ |
1332 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
1333 | state_to_char[entry->ctx.next_state] : 'X'; | |
1334 | ret = trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d:%c\n", | |
b3806b43 SR |
1335 | entry->ctx.prev_pid, |
1336 | entry->ctx.prev_prio, | |
1337 | S, | |
57422797 | 1338 | entry->type == TRACE_CTX ? "==>" : " +", |
b3806b43 | 1339 | entry->ctx.next_pid, |
bac524d3 PZ |
1340 | entry->ctx.next_prio, |
1341 | T); | |
b3806b43 SR |
1342 | if (!ret) |
1343 | return 0; | |
bc0c38d1 | 1344 | break; |
f0a920d5 | 1345 | case TRACE_SPECIAL: |
88a4216c | 1346 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
f0a920d5 IM |
1347 | entry->special.arg1, |
1348 | entry->special.arg2, | |
1349 | entry->special.arg3); | |
1350 | if (!ret) | |
1351 | return 0; | |
1352 | break; | |
86387f7e IM |
1353 | case TRACE_STACK: |
1354 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { | |
1355 | if (i) { | |
1356 | ret = trace_seq_puts(s, " <= "); | |
1357 | if (!ret) | |
1358 | return 0; | |
1359 | } | |
1360 | ret = seq_print_ip_sym(s, entry->stack.caller[i], | |
1361 | sym_flags); | |
1362 | if (!ret) | |
1363 | return 0; | |
1364 | } | |
1365 | ret = trace_seq_puts(s, "\n"); | |
1366 | if (!ret) | |
1367 | return 0; | |
1368 | break; | |
bc0c38d1 | 1369 | } |
b3806b43 | 1370 | return 1; |
bc0c38d1 SR |
1371 | } |
1372 | ||
e309b41d | 1373 | static int print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 IM |
1374 | { |
1375 | struct trace_seq *s = &iter->seq; | |
1376 | struct trace_entry *entry; | |
1377 | int ret; | |
bac524d3 | 1378 | int S, T; |
f9896bf3 IM |
1379 | |
1380 | entry = iter->ent; | |
1381 | ||
1382 | ret = trace_seq_printf(s, "%d %d %llu ", | |
1383 | entry->pid, iter->cpu, entry->t); | |
1384 | if (!ret) | |
1385 | return 0; | |
1386 | ||
1387 | switch (entry->type) { | |
1388 | case TRACE_FN: | |
1389 | ret = trace_seq_printf(s, "%x %x\n", | |
1390 | entry->fn.ip, entry->fn.parent_ip); | |
1391 | if (!ret) | |
1392 | return 0; | |
1393 | break; | |
1394 | case TRACE_CTX: | |
57422797 | 1395 | case TRACE_WAKE: |
f9896bf3 IM |
1396 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
1397 | state_to_char[entry->ctx.prev_state] : 'X'; | |
bac524d3 PZ |
1398 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
1399 | state_to_char[entry->ctx.next_state] : 'X'; | |
57422797 IM |
1400 | if (entry->type == TRACE_WAKE) |
1401 | S = '+'; | |
bac524d3 | 1402 | ret = trace_seq_printf(s, "%d %d %c %d %d %c\n", |
f9896bf3 IM |
1403 | entry->ctx.prev_pid, |
1404 | entry->ctx.prev_prio, | |
1405 | S, | |
1406 | entry->ctx.next_pid, | |
bac524d3 PZ |
1407 | entry->ctx.next_prio, |
1408 | T); | |
f9896bf3 IM |
1409 | if (!ret) |
1410 | return 0; | |
1411 | break; | |
f0a920d5 | 1412 | case TRACE_SPECIAL: |
86387f7e | 1413 | case TRACE_STACK: |
88a4216c | 1414 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
f0a920d5 IM |
1415 | entry->special.arg1, |
1416 | entry->special.arg2, | |
1417 | entry->special.arg3); | |
1418 | if (!ret) | |
1419 | return 0; | |
1420 | break; | |
f9896bf3 IM |
1421 | } |
1422 | return 1; | |
1423 | } | |
1424 | ||
cb0f12aa IM |
1425 | #define SEQ_PUT_FIELD_RET(s, x) \ |
1426 | do { \ | |
1427 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ | |
1428 | return 0; \ | |
1429 | } while (0) | |
1430 | ||
5e3ca0ec IM |
1431 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
1432 | do { \ | |
1433 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ | |
1434 | return 0; \ | |
1435 | } while (0) | |
1436 | ||
e309b41d | 1437 | static int print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec IM |
1438 | { |
1439 | struct trace_seq *s = &iter->seq; | |
1440 | unsigned char newline = '\n'; | |
1441 | struct trace_entry *entry; | |
bac524d3 | 1442 | int S, T; |
5e3ca0ec IM |
1443 | |
1444 | entry = iter->ent; | |
1445 | ||
1446 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); | |
1447 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); | |
1448 | SEQ_PUT_HEX_FIELD_RET(s, entry->t); | |
1449 | ||
1450 | switch (entry->type) { | |
1451 | case TRACE_FN: | |
1452 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.ip); | |
1453 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); | |
1454 | break; | |
1455 | case TRACE_CTX: | |
57422797 | 1456 | case TRACE_WAKE: |
5e3ca0ec IM |
1457 | S = entry->ctx.prev_state < sizeof(state_to_char) ? |
1458 | state_to_char[entry->ctx.prev_state] : 'X'; | |
bac524d3 PZ |
1459 | T = entry->ctx.next_state < sizeof(state_to_char) ? |
1460 | state_to_char[entry->ctx.next_state] : 'X'; | |
57422797 IM |
1461 | if (entry->type == TRACE_WAKE) |
1462 | S = '+'; | |
5e3ca0ec IM |
1463 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_pid); |
1464 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.prev_prio); | |
1465 | SEQ_PUT_HEX_FIELD_RET(s, S); | |
1466 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_pid); | |
1467 | SEQ_PUT_HEX_FIELD_RET(s, entry->ctx.next_prio); | |
1468 | SEQ_PUT_HEX_FIELD_RET(s, entry->fn.parent_ip); | |
bac524d3 | 1469 | SEQ_PUT_HEX_FIELD_RET(s, T); |
5e3ca0ec IM |
1470 | break; |
1471 | case TRACE_SPECIAL: | |
86387f7e | 1472 | case TRACE_STACK: |
5e3ca0ec IM |
1473 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg1); |
1474 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg2); | |
1475 | SEQ_PUT_HEX_FIELD_RET(s, entry->special.arg3); | |
1476 | break; | |
1477 | } | |
1478 | SEQ_PUT_FIELD_RET(s, newline); | |
1479 | ||
1480 | return 1; | |
1481 | } | |
1482 | ||
e309b41d | 1483 | static int print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa IM |
1484 | { |
1485 | struct trace_seq *s = &iter->seq; | |
1486 | struct trace_entry *entry; | |
1487 | ||
1488 | entry = iter->ent; | |
1489 | ||
1490 | SEQ_PUT_FIELD_RET(s, entry->pid); | |
1491 | SEQ_PUT_FIELD_RET(s, entry->cpu); | |
1492 | SEQ_PUT_FIELD_RET(s, entry->t); | |
1493 | ||
1494 | switch (entry->type) { | |
1495 | case TRACE_FN: | |
1496 | SEQ_PUT_FIELD_RET(s, entry->fn.ip); | |
1497 | SEQ_PUT_FIELD_RET(s, entry->fn.parent_ip); | |
1498 | break; | |
1499 | case TRACE_CTX: | |
1500 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_pid); | |
1501 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_prio); | |
1502 | SEQ_PUT_FIELD_RET(s, entry->ctx.prev_state); | |
1503 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_pid); | |
1504 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_prio); | |
bac524d3 | 1505 | SEQ_PUT_FIELD_RET(s, entry->ctx.next_state); |
cb0f12aa | 1506 | break; |
f0a920d5 | 1507 | case TRACE_SPECIAL: |
86387f7e | 1508 | case TRACE_STACK: |
f0a920d5 IM |
1509 | SEQ_PUT_FIELD_RET(s, entry->special.arg1); |
1510 | SEQ_PUT_FIELD_RET(s, entry->special.arg2); | |
1511 | SEQ_PUT_FIELD_RET(s, entry->special.arg3); | |
1512 | break; | |
cb0f12aa IM |
1513 | } |
1514 | return 1; | |
1515 | } | |
1516 | ||
bc0c38d1 SR |
1517 | static int trace_empty(struct trace_iterator *iter) |
1518 | { | |
1519 | struct trace_array_cpu *data; | |
1520 | int cpu; | |
1521 | ||
1522 | for_each_possible_cpu(cpu) { | |
1523 | data = iter->tr->data[cpu]; | |
1524 | ||
b3806b43 SR |
1525 | if (head_page(data) && data->trace_idx && |
1526 | (data->trace_tail != data->trace_head || | |
1527 | data->trace_tail_idx != data->trace_head_idx)) | |
bc0c38d1 SR |
1528 | return 0; |
1529 | } | |
1530 | return 1; | |
1531 | } | |
1532 | ||
f9896bf3 IM |
1533 | static int print_trace_line(struct trace_iterator *iter) |
1534 | { | |
72829bc3 TG |
1535 | if (iter->trace && iter->trace->print_line) |
1536 | return iter->trace->print_line(iter); | |
1537 | ||
cb0f12aa IM |
1538 | if (trace_flags & TRACE_ITER_BIN) |
1539 | return print_bin_fmt(iter); | |
1540 | ||
5e3ca0ec IM |
1541 | if (trace_flags & TRACE_ITER_HEX) |
1542 | return print_hex_fmt(iter); | |
1543 | ||
f9896bf3 IM |
1544 | if (trace_flags & TRACE_ITER_RAW) |
1545 | return print_raw_fmt(iter); | |
1546 | ||
1547 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
1548 | return print_lat_fmt(iter, iter->idx, iter->cpu); | |
1549 | ||
1550 | return print_trace_fmt(iter); | |
1551 | } | |
1552 | ||
bc0c38d1 SR |
1553 | static int s_show(struct seq_file *m, void *v) |
1554 | { | |
1555 | struct trace_iterator *iter = v; | |
1556 | ||
1557 | if (iter->ent == NULL) { | |
1558 | if (iter->tr) { | |
1559 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
1560 | seq_puts(m, "#\n"); | |
1561 | } | |
1562 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { | |
1563 | /* print nothing if the buffers are empty */ | |
1564 | if (trace_empty(iter)) | |
1565 | return 0; | |
1566 | print_trace_header(m, iter); | |
1567 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1568 | print_lat_help_header(m); | |
1569 | } else { | |
1570 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1571 | print_func_help_header(m); | |
1572 | } | |
1573 | } else { | |
f9896bf3 | 1574 | print_trace_line(iter); |
214023c3 | 1575 | trace_print_seq(m, &iter->seq); |
bc0c38d1 SR |
1576 | } |
1577 | ||
1578 | return 0; | |
1579 | } | |
1580 | ||
1581 | static struct seq_operations tracer_seq_ops = { | |
4bf39a94 IM |
1582 | .start = s_start, |
1583 | .next = s_next, | |
1584 | .stop = s_stop, | |
1585 | .show = s_show, | |
bc0c38d1 SR |
1586 | }; |
1587 | ||
e309b41d | 1588 | static struct trace_iterator * |
bc0c38d1 SR |
1589 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
1590 | { | |
1591 | struct trace_iterator *iter; | |
1592 | ||
60a11774 SR |
1593 | if (tracing_disabled) { |
1594 | *ret = -ENODEV; | |
1595 | return NULL; | |
1596 | } | |
1597 | ||
bc0c38d1 SR |
1598 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
1599 | if (!iter) { | |
1600 | *ret = -ENOMEM; | |
1601 | goto out; | |
1602 | } | |
1603 | ||
1604 | mutex_lock(&trace_types_lock); | |
1605 | if (current_trace && current_trace->print_max) | |
1606 | iter->tr = &max_tr; | |
1607 | else | |
1608 | iter->tr = inode->i_private; | |
1609 | iter->trace = current_trace; | |
1610 | iter->pos = -1; | |
1611 | ||
1612 | /* TODO stop tracer */ | |
1613 | *ret = seq_open(file, &tracer_seq_ops); | |
1614 | if (!*ret) { | |
1615 | struct seq_file *m = file->private_data; | |
1616 | m->private = iter; | |
1617 | ||
1618 | /* stop the trace while dumping */ | |
1619 | if (iter->tr->ctrl) | |
1620 | tracer_enabled = 0; | |
1621 | ||
1622 | if (iter->trace && iter->trace->open) | |
1623 | iter->trace->open(iter); | |
1624 | } else { | |
1625 | kfree(iter); | |
1626 | iter = NULL; | |
1627 | } | |
1628 | mutex_unlock(&trace_types_lock); | |
1629 | ||
1630 | out: | |
1631 | return iter; | |
1632 | } | |
1633 | ||
1634 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
1635 | { | |
60a11774 SR |
1636 | if (tracing_disabled) |
1637 | return -ENODEV; | |
1638 | ||
bc0c38d1 SR |
1639 | filp->private_data = inode->i_private; |
1640 | return 0; | |
1641 | } | |
1642 | ||
1643 | int tracing_release(struct inode *inode, struct file *file) | |
1644 | { | |
1645 | struct seq_file *m = (struct seq_file *)file->private_data; | |
1646 | struct trace_iterator *iter = m->private; | |
1647 | ||
1648 | mutex_lock(&trace_types_lock); | |
1649 | if (iter->trace && iter->trace->close) | |
1650 | iter->trace->close(iter); | |
1651 | ||
1652 | /* reenable tracing if it was previously enabled */ | |
1653 | if (iter->tr->ctrl) | |
1654 | tracer_enabled = 1; | |
1655 | mutex_unlock(&trace_types_lock); | |
1656 | ||
1657 | seq_release(inode, file); | |
1658 | kfree(iter); | |
1659 | return 0; | |
1660 | } | |
1661 | ||
1662 | static int tracing_open(struct inode *inode, struct file *file) | |
1663 | { | |
1664 | int ret; | |
1665 | ||
1666 | __tracing_open(inode, file, &ret); | |
1667 | ||
1668 | return ret; | |
1669 | } | |
1670 | ||
1671 | static int tracing_lt_open(struct inode *inode, struct file *file) | |
1672 | { | |
1673 | struct trace_iterator *iter; | |
1674 | int ret; | |
1675 | ||
1676 | iter = __tracing_open(inode, file, &ret); | |
1677 | ||
1678 | if (!ret) | |
1679 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
1680 | ||
1681 | return ret; | |
1682 | } | |
1683 | ||
1684 | ||
e309b41d | 1685 | static void * |
bc0c38d1 SR |
1686 | t_next(struct seq_file *m, void *v, loff_t *pos) |
1687 | { | |
1688 | struct tracer *t = m->private; | |
1689 | ||
1690 | (*pos)++; | |
1691 | ||
1692 | if (t) | |
1693 | t = t->next; | |
1694 | ||
1695 | m->private = t; | |
1696 | ||
1697 | return t; | |
1698 | } | |
1699 | ||
1700 | static void *t_start(struct seq_file *m, loff_t *pos) | |
1701 | { | |
1702 | struct tracer *t = m->private; | |
1703 | loff_t l = 0; | |
1704 | ||
1705 | mutex_lock(&trace_types_lock); | |
1706 | for (; t && l < *pos; t = t_next(m, t, &l)) | |
1707 | ; | |
1708 | ||
1709 | return t; | |
1710 | } | |
1711 | ||
1712 | static void t_stop(struct seq_file *m, void *p) | |
1713 | { | |
1714 | mutex_unlock(&trace_types_lock); | |
1715 | } | |
1716 | ||
1717 | static int t_show(struct seq_file *m, void *v) | |
1718 | { | |
1719 | struct tracer *t = v; | |
1720 | ||
1721 | if (!t) | |
1722 | return 0; | |
1723 | ||
1724 | seq_printf(m, "%s", t->name); | |
1725 | if (t->next) | |
1726 | seq_putc(m, ' '); | |
1727 | else | |
1728 | seq_putc(m, '\n'); | |
1729 | ||
1730 | return 0; | |
1731 | } | |
1732 | ||
1733 | static struct seq_operations show_traces_seq_ops = { | |
4bf39a94 IM |
1734 | .start = t_start, |
1735 | .next = t_next, | |
1736 | .stop = t_stop, | |
1737 | .show = t_show, | |
bc0c38d1 SR |
1738 | }; |
1739 | ||
1740 | static int show_traces_open(struct inode *inode, struct file *file) | |
1741 | { | |
1742 | int ret; | |
1743 | ||
60a11774 SR |
1744 | if (tracing_disabled) |
1745 | return -ENODEV; | |
1746 | ||
bc0c38d1 SR |
1747 | ret = seq_open(file, &show_traces_seq_ops); |
1748 | if (!ret) { | |
1749 | struct seq_file *m = file->private_data; | |
1750 | m->private = trace_types; | |
1751 | } | |
1752 | ||
1753 | return ret; | |
1754 | } | |
1755 | ||
1756 | static struct file_operations tracing_fops = { | |
4bf39a94 IM |
1757 | .open = tracing_open, |
1758 | .read = seq_read, | |
1759 | .llseek = seq_lseek, | |
1760 | .release = tracing_release, | |
bc0c38d1 SR |
1761 | }; |
1762 | ||
1763 | static struct file_operations tracing_lt_fops = { | |
4bf39a94 IM |
1764 | .open = tracing_lt_open, |
1765 | .read = seq_read, | |
1766 | .llseek = seq_lseek, | |
1767 | .release = tracing_release, | |
bc0c38d1 SR |
1768 | }; |
1769 | ||
1770 | static struct file_operations show_traces_fops = { | |
c7078de1 IM |
1771 | .open = show_traces_open, |
1772 | .read = seq_read, | |
1773 | .release = seq_release, | |
1774 | }; | |
1775 | ||
36dfe925 IM |
1776 | /* |
1777 | * Only trace on a CPU if the bitmask is set: | |
1778 | */ | |
1779 | static cpumask_t tracing_cpumask = CPU_MASK_ALL; | |
1780 | ||
1781 | /* | |
1782 | * When tracing/tracing_cpu_mask is modified then this holds | |
1783 | * the new bitmask we are about to install: | |
1784 | */ | |
1785 | static cpumask_t tracing_cpumask_new; | |
1786 | ||
1787 | /* | |
1788 | * The tracer itself will not take this lock, but still we want | |
1789 | * to provide a consistent cpumask to user-space: | |
1790 | */ | |
1791 | static DEFINE_MUTEX(tracing_cpumask_update_lock); | |
1792 | ||
1793 | /* | |
1794 | * Temporary storage for the character representation of the | |
1795 | * CPU bitmask (and one more byte for the newline): | |
1796 | */ | |
1797 | static char mask_str[NR_CPUS + 1]; | |
1798 | ||
c7078de1 IM |
1799 | static ssize_t |
1800 | tracing_cpumask_read(struct file *filp, char __user *ubuf, | |
1801 | size_t count, loff_t *ppos) | |
1802 | { | |
36dfe925 | 1803 | int len; |
c7078de1 IM |
1804 | |
1805 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 IM |
1806 | |
1807 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); | |
1808 | if (count - len < 2) { | |
1809 | count = -EINVAL; | |
1810 | goto out_err; | |
1811 | } | |
1812 | len += sprintf(mask_str + len, "\n"); | |
1813 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); | |
1814 | ||
1815 | out_err: | |
c7078de1 IM |
1816 | mutex_unlock(&tracing_cpumask_update_lock); |
1817 | ||
1818 | return count; | |
1819 | } | |
1820 | ||
1821 | static ssize_t | |
1822 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, | |
1823 | size_t count, loff_t *ppos) | |
1824 | { | |
36dfe925 | 1825 | int err, cpu; |
c7078de1 IM |
1826 | |
1827 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 | 1828 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
c7078de1 | 1829 | if (err) |
36dfe925 IM |
1830 | goto err_unlock; |
1831 | ||
92205c23 SR |
1832 | raw_local_irq_disable(); |
1833 | __raw_spin_lock(&ftrace_max_lock); | |
36dfe925 IM |
1834 | for_each_possible_cpu(cpu) { |
1835 | /* | |
1836 | * Increase/decrease the disabled counter if we are | |
1837 | * about to flip a bit in the cpumask: | |
1838 | */ | |
1839 | if (cpu_isset(cpu, tracing_cpumask) && | |
1840 | !cpu_isset(cpu, tracing_cpumask_new)) { | |
1841 | atomic_inc(&global_trace.data[cpu]->disabled); | |
1842 | } | |
1843 | if (!cpu_isset(cpu, tracing_cpumask) && | |
1844 | cpu_isset(cpu, tracing_cpumask_new)) { | |
1845 | atomic_dec(&global_trace.data[cpu]->disabled); | |
1846 | } | |
1847 | } | |
92205c23 SR |
1848 | __raw_spin_unlock(&ftrace_max_lock); |
1849 | raw_local_irq_enable(); | |
36dfe925 IM |
1850 | |
1851 | tracing_cpumask = tracing_cpumask_new; | |
1852 | ||
1853 | mutex_unlock(&tracing_cpumask_update_lock); | |
c7078de1 IM |
1854 | |
1855 | return count; | |
36dfe925 IM |
1856 | |
1857 | err_unlock: | |
1858 | mutex_unlock(&tracing_cpumask_update_lock); | |
1859 | ||
1860 | return err; | |
c7078de1 IM |
1861 | } |
1862 | ||
1863 | static struct file_operations tracing_cpumask_fops = { | |
1864 | .open = tracing_open_generic, | |
1865 | .read = tracing_cpumask_read, | |
1866 | .write = tracing_cpumask_write, | |
bc0c38d1 SR |
1867 | }; |
1868 | ||
1869 | static ssize_t | |
1870 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, | |
1871 | size_t cnt, loff_t *ppos) | |
1872 | { | |
1873 | char *buf; | |
1874 | int r = 0; | |
1875 | int len = 0; | |
1876 | int i; | |
1877 | ||
1878 | /* calulate max size */ | |
1879 | for (i = 0; trace_options[i]; i++) { | |
1880 | len += strlen(trace_options[i]); | |
1881 | len += 3; /* "no" and space */ | |
1882 | } | |
1883 | ||
1884 | /* +2 for \n and \0 */ | |
1885 | buf = kmalloc(len + 2, GFP_KERNEL); | |
1886 | if (!buf) | |
1887 | return -ENOMEM; | |
1888 | ||
1889 | for (i = 0; trace_options[i]; i++) { | |
1890 | if (trace_flags & (1 << i)) | |
1891 | r += sprintf(buf + r, "%s ", trace_options[i]); | |
1892 | else | |
1893 | r += sprintf(buf + r, "no%s ", trace_options[i]); | |
1894 | } | |
1895 | ||
1896 | r += sprintf(buf + r, "\n"); | |
1897 | WARN_ON(r >= len + 2); | |
1898 | ||
36dfe925 | 1899 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
1900 | |
1901 | kfree(buf); | |
1902 | ||
1903 | return r; | |
1904 | } | |
1905 | ||
1906 | static ssize_t | |
1907 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, | |
1908 | size_t cnt, loff_t *ppos) | |
1909 | { | |
1910 | char buf[64]; | |
1911 | char *cmp = buf; | |
1912 | int neg = 0; | |
1913 | int i; | |
1914 | ||
cffae437 SR |
1915 | if (cnt >= sizeof(buf)) |
1916 | return -EINVAL; | |
bc0c38d1 SR |
1917 | |
1918 | if (copy_from_user(&buf, ubuf, cnt)) | |
1919 | return -EFAULT; | |
1920 | ||
1921 | buf[cnt] = 0; | |
1922 | ||
1923 | if (strncmp(buf, "no", 2) == 0) { | |
1924 | neg = 1; | |
1925 | cmp += 2; | |
1926 | } | |
1927 | ||
1928 | for (i = 0; trace_options[i]; i++) { | |
1929 | int len = strlen(trace_options[i]); | |
1930 | ||
1931 | if (strncmp(cmp, trace_options[i], len) == 0) { | |
1932 | if (neg) | |
1933 | trace_flags &= ~(1 << i); | |
1934 | else | |
1935 | trace_flags |= (1 << i); | |
1936 | break; | |
1937 | } | |
1938 | } | |
442e544c IM |
1939 | /* |
1940 | * If no option could be set, return an error: | |
1941 | */ | |
1942 | if (!trace_options[i]) | |
1943 | return -EINVAL; | |
bc0c38d1 SR |
1944 | |
1945 | filp->f_pos += cnt; | |
1946 | ||
1947 | return cnt; | |
1948 | } | |
1949 | ||
1950 | static struct file_operations tracing_iter_fops = { | |
c7078de1 IM |
1951 | .open = tracing_open_generic, |
1952 | .read = tracing_iter_ctrl_read, | |
1953 | .write = tracing_iter_ctrl_write, | |
bc0c38d1 SR |
1954 | }; |
1955 | ||
7bd2f24c IM |
1956 | static const char readme_msg[] = |
1957 | "tracing mini-HOWTO:\n\n" | |
1958 | "# mkdir /debug\n" | |
1959 | "# mount -t debugfs nodev /debug\n\n" | |
1960 | "# cat /debug/tracing/available_tracers\n" | |
1961 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" | |
1962 | "# cat /debug/tracing/current_tracer\n" | |
1963 | "none\n" | |
1964 | "# echo sched_switch > /debug/tracing/current_tracer\n" | |
1965 | "# cat /debug/tracing/current_tracer\n" | |
1966 | "sched_switch\n" | |
1967 | "# cat /debug/tracing/iter_ctrl\n" | |
1968 | "noprint-parent nosym-offset nosym-addr noverbose\n" | |
1969 | "# echo print-parent > /debug/tracing/iter_ctrl\n" | |
1970 | "# echo 1 > /debug/tracing/tracing_enabled\n" | |
1971 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" | |
1972 | "echo 0 > /debug/tracing/tracing_enabled\n" | |
1973 | ; | |
1974 | ||
1975 | static ssize_t | |
1976 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
1977 | size_t cnt, loff_t *ppos) | |
1978 | { | |
1979 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
1980 | readme_msg, strlen(readme_msg)); | |
1981 | } | |
1982 | ||
1983 | static struct file_operations tracing_readme_fops = { | |
c7078de1 IM |
1984 | .open = tracing_open_generic, |
1985 | .read = tracing_readme_read, | |
7bd2f24c IM |
1986 | }; |
1987 | ||
bc0c38d1 SR |
1988 | static ssize_t |
1989 | tracing_ctrl_read(struct file *filp, char __user *ubuf, | |
1990 | size_t cnt, loff_t *ppos) | |
1991 | { | |
1992 | struct trace_array *tr = filp->private_data; | |
1993 | char buf[64]; | |
1994 | int r; | |
1995 | ||
1996 | r = sprintf(buf, "%ld\n", tr->ctrl); | |
4e3c3333 | 1997 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
1998 | } |
1999 | ||
2000 | static ssize_t | |
2001 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, | |
2002 | size_t cnt, loff_t *ppos) | |
2003 | { | |
2004 | struct trace_array *tr = filp->private_data; | |
bc0c38d1 | 2005 | char buf[64]; |
c6caeeb1 SR |
2006 | long val; |
2007 | int ret; | |
bc0c38d1 | 2008 | |
cffae437 SR |
2009 | if (cnt >= sizeof(buf)) |
2010 | return -EINVAL; | |
bc0c38d1 SR |
2011 | |
2012 | if (copy_from_user(&buf, ubuf, cnt)) | |
2013 | return -EFAULT; | |
2014 | ||
2015 | buf[cnt] = 0; | |
2016 | ||
c6caeeb1 SR |
2017 | ret = strict_strtoul(buf, 10, &val); |
2018 | if (ret < 0) | |
2019 | return ret; | |
bc0c38d1 SR |
2020 | |
2021 | val = !!val; | |
2022 | ||
2023 | mutex_lock(&trace_types_lock); | |
2024 | if (tr->ctrl ^ val) { | |
2025 | if (val) | |
2026 | tracer_enabled = 1; | |
2027 | else | |
2028 | tracer_enabled = 0; | |
2029 | ||
2030 | tr->ctrl = val; | |
2031 | ||
2032 | if (current_trace && current_trace->ctrl_update) | |
2033 | current_trace->ctrl_update(tr); | |
2034 | } | |
2035 | mutex_unlock(&trace_types_lock); | |
2036 | ||
2037 | filp->f_pos += cnt; | |
2038 | ||
2039 | return cnt; | |
2040 | } | |
2041 | ||
2042 | static ssize_t | |
2043 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
2044 | size_t cnt, loff_t *ppos) | |
2045 | { | |
2046 | char buf[max_tracer_type_len+2]; | |
2047 | int r; | |
2048 | ||
2049 | mutex_lock(&trace_types_lock); | |
2050 | if (current_trace) | |
2051 | r = sprintf(buf, "%s\n", current_trace->name); | |
2052 | else | |
2053 | r = sprintf(buf, "\n"); | |
2054 | mutex_unlock(&trace_types_lock); | |
2055 | ||
4bf39a94 | 2056 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2057 | } |
2058 | ||
2059 | static ssize_t | |
2060 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
2061 | size_t cnt, loff_t *ppos) | |
2062 | { | |
2063 | struct trace_array *tr = &global_trace; | |
2064 | struct tracer *t; | |
2065 | char buf[max_tracer_type_len+1]; | |
2066 | int i; | |
2067 | ||
2068 | if (cnt > max_tracer_type_len) | |
2069 | cnt = max_tracer_type_len; | |
2070 | ||
2071 | if (copy_from_user(&buf, ubuf, cnt)) | |
2072 | return -EFAULT; | |
2073 | ||
2074 | buf[cnt] = 0; | |
2075 | ||
2076 | /* strip ending whitespace. */ | |
2077 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
2078 | buf[i] = 0; | |
2079 | ||
2080 | mutex_lock(&trace_types_lock); | |
2081 | for (t = trace_types; t; t = t->next) { | |
2082 | if (strcmp(t->name, buf) == 0) | |
2083 | break; | |
2084 | } | |
2085 | if (!t || t == current_trace) | |
2086 | goto out; | |
2087 | ||
2088 | if (current_trace && current_trace->reset) | |
2089 | current_trace->reset(tr); | |
2090 | ||
2091 | current_trace = t; | |
2092 | if (t->init) | |
2093 | t->init(tr); | |
2094 | ||
2095 | out: | |
2096 | mutex_unlock(&trace_types_lock); | |
2097 | ||
2098 | filp->f_pos += cnt; | |
2099 | ||
2100 | return cnt; | |
2101 | } | |
2102 | ||
2103 | static ssize_t | |
2104 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
2105 | size_t cnt, loff_t *ppos) | |
2106 | { | |
2107 | unsigned long *ptr = filp->private_data; | |
2108 | char buf[64]; | |
2109 | int r; | |
2110 | ||
cffae437 | 2111 | r = snprintf(buf, sizeof(buf), "%ld\n", |
bc0c38d1 | 2112 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
cffae437 SR |
2113 | if (r > sizeof(buf)) |
2114 | r = sizeof(buf); | |
4bf39a94 | 2115 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2116 | } |
2117 | ||
2118 | static ssize_t | |
2119 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
2120 | size_t cnt, loff_t *ppos) | |
2121 | { | |
2122 | long *ptr = filp->private_data; | |
bc0c38d1 | 2123 | char buf[64]; |
c6caeeb1 SR |
2124 | long val; |
2125 | int ret; | |
bc0c38d1 | 2126 | |
cffae437 SR |
2127 | if (cnt >= sizeof(buf)) |
2128 | return -EINVAL; | |
bc0c38d1 SR |
2129 | |
2130 | if (copy_from_user(&buf, ubuf, cnt)) | |
2131 | return -EFAULT; | |
2132 | ||
2133 | buf[cnt] = 0; | |
2134 | ||
c6caeeb1 SR |
2135 | ret = strict_strtoul(buf, 10, &val); |
2136 | if (ret < 0) | |
2137 | return ret; | |
bc0c38d1 SR |
2138 | |
2139 | *ptr = val * 1000; | |
2140 | ||
2141 | return cnt; | |
2142 | } | |
2143 | ||
b3806b43 SR |
2144 | static atomic_t tracing_reader; |
2145 | ||
2146 | static int tracing_open_pipe(struct inode *inode, struct file *filp) | |
2147 | { | |
2148 | struct trace_iterator *iter; | |
2149 | ||
2150 | if (tracing_disabled) | |
2151 | return -ENODEV; | |
2152 | ||
2153 | /* We only allow for reader of the pipe */ | |
2154 | if (atomic_inc_return(&tracing_reader) != 1) { | |
2155 | atomic_dec(&tracing_reader); | |
2156 | return -EBUSY; | |
2157 | } | |
2158 | ||
2159 | /* create a buffer to store the information to pass to userspace */ | |
2160 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
2161 | if (!iter) | |
2162 | return -ENOMEM; | |
2163 | ||
2164 | iter->tr = &global_trace; | |
72829bc3 | 2165 | iter->trace = current_trace; |
b3806b43 SR |
2166 | |
2167 | filp->private_data = iter; | |
2168 | ||
2169 | return 0; | |
2170 | } | |
2171 | ||
2172 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
2173 | { | |
2174 | struct trace_iterator *iter = file->private_data; | |
2175 | ||
2176 | kfree(iter); | |
2177 | atomic_dec(&tracing_reader); | |
2178 | ||
2179 | return 0; | |
2180 | } | |
2181 | ||
2a2cc8f7 SSP |
2182 | static unsigned int |
2183 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) | |
2184 | { | |
2185 | struct trace_iterator *iter = filp->private_data; | |
2186 | ||
2187 | if (trace_flags & TRACE_ITER_BLOCK) { | |
2188 | /* | |
2189 | * Always select as readable when in blocking mode | |
2190 | */ | |
2191 | return POLLIN | POLLRDNORM; | |
afc2abc0 | 2192 | } else { |
2a2cc8f7 SSP |
2193 | if (!trace_empty(iter)) |
2194 | return POLLIN | POLLRDNORM; | |
2195 | poll_wait(filp, &trace_wait, poll_table); | |
2196 | if (!trace_empty(iter)) | |
2197 | return POLLIN | POLLRDNORM; | |
2198 | ||
2199 | return 0; | |
2200 | } | |
2201 | } | |
2202 | ||
b3806b43 SR |
2203 | /* |
2204 | * Consumer reader. | |
2205 | */ | |
2206 | static ssize_t | |
2207 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
2208 | size_t cnt, loff_t *ppos) | |
2209 | { | |
2210 | struct trace_iterator *iter = filp->private_data; | |
2211 | struct trace_array_cpu *data; | |
b5685aed SR |
2212 | struct trace_array *tr = iter->tr; |
2213 | struct tracer *tracer = iter->trace; | |
b3806b43 | 2214 | static cpumask_t mask; |
b3806b43 SR |
2215 | static int start; |
2216 | unsigned long flags; | |
25770467 | 2217 | #ifdef CONFIG_FTRACE |
2e0f5761 | 2218 | int ftrace_save; |
25770467 | 2219 | #endif |
b3806b43 SR |
2220 | int read = 0; |
2221 | int cpu; | |
2222 | int len; | |
2223 | int ret; | |
2224 | ||
2225 | /* return any leftover data */ | |
2226 | if (iter->seq.len > start) { | |
2227 | len = iter->seq.len - start; | |
2228 | if (cnt > len) | |
2229 | cnt = len; | |
2230 | ret = copy_to_user(ubuf, iter->seq.buffer + start, cnt); | |
2231 | if (ret) | |
2232 | cnt = -EFAULT; | |
2233 | ||
2234 | start += len; | |
2235 | ||
2236 | return cnt; | |
2237 | } | |
2238 | ||
2239 | trace_seq_reset(&iter->seq); | |
2240 | start = 0; | |
2241 | ||
2242 | while (trace_empty(iter)) { | |
2dc8f095 SR |
2243 | |
2244 | if ((filp->f_flags & O_NONBLOCK)) | |
2245 | return -EAGAIN; | |
2246 | ||
b3806b43 SR |
2247 | /* |
2248 | * This is a make-shift waitqueue. The reason we don't use | |
2249 | * an actual wait queue is because: | |
2250 | * 1) we only ever have one waiter | |
2251 | * 2) the tracing, traces all functions, we don't want | |
2252 | * the overhead of calling wake_up and friends | |
2253 | * (and tracing them too) | |
2254 | * Anyway, this is really very primitive wakeup. | |
2255 | */ | |
2256 | set_current_state(TASK_INTERRUPTIBLE); | |
2257 | iter->tr->waiter = current; | |
2258 | ||
2259 | /* sleep for one second, and try again. */ | |
2260 | schedule_timeout(HZ); | |
2261 | ||
2262 | iter->tr->waiter = NULL; | |
2263 | ||
2264 | if (signal_pending(current)) | |
2265 | return -EINTR; | |
2266 | ||
84527997 SR |
2267 | if (iter->trace != current_trace) |
2268 | return 0; | |
2269 | ||
b3806b43 SR |
2270 | /* |
2271 | * We block until we read something and tracing is disabled. | |
2272 | * We still block if tracing is disabled, but we have never | |
2273 | * read anything. This allows a user to cat this file, and | |
2274 | * then enable tracing. But after we have read something, | |
2275 | * we give an EOF when tracing is again disabled. | |
2276 | * | |
2277 | * iter->pos will be 0 if we haven't read anything. | |
2278 | */ | |
2279 | if (!tracer_enabled && iter->pos) | |
2280 | break; | |
2281 | ||
2282 | continue; | |
2283 | } | |
2284 | ||
2285 | /* stop when tracing is finished */ | |
2286 | if (trace_empty(iter)) | |
2287 | return 0; | |
2288 | ||
2289 | if (cnt >= PAGE_SIZE) | |
2290 | cnt = PAGE_SIZE - 1; | |
2291 | ||
2292 | memset(iter, 0, sizeof(*iter)); | |
b5685aed SR |
2293 | iter->tr = tr; |
2294 | iter->trace = tracer; | |
b3806b43 SR |
2295 | iter->pos = -1; |
2296 | ||
2297 | /* | |
2298 | * We need to stop all tracing on all CPUS to read the | |
2299 | * the next buffer. This is a bit expensive, but is | |
2300 | * not done often. We fill all what we can read, | |
2301 | * and then release the locks again. | |
2302 | */ | |
2303 | ||
2304 | cpus_clear(mask); | |
2305 | local_irq_save(flags); | |
25770467 | 2306 | #ifdef CONFIG_FTRACE |
2e0f5761 IM |
2307 | ftrace_save = ftrace_enabled; |
2308 | ftrace_enabled = 0; | |
25770467 | 2309 | #endif |
2e0f5761 | 2310 | smp_wmb(); |
b3806b43 SR |
2311 | for_each_possible_cpu(cpu) { |
2312 | data = iter->tr->data[cpu]; | |
2313 | ||
2314 | if (!head_page(data) || !data->trace_idx) | |
2315 | continue; | |
2316 | ||
2317 | atomic_inc(&data->disabled); | |
b3806b43 SR |
2318 | cpu_set(cpu, mask); |
2319 | } | |
2320 | ||
2e0f5761 IM |
2321 | for_each_cpu_mask(cpu, mask) { |
2322 | data = iter->tr->data[cpu]; | |
92205c23 | 2323 | __raw_spin_lock(&data->lock); |
2e0f5761 IM |
2324 | } |
2325 | ||
088b1e42 SR |
2326 | while (find_next_entry_inc(iter) != NULL) { |
2327 | int len = iter->seq.len; | |
2328 | ||
f9896bf3 | 2329 | ret = print_trace_line(iter); |
088b1e42 SR |
2330 | if (!ret) { |
2331 | /* don't print partial lines */ | |
2332 | iter->seq.len = len; | |
b3806b43 | 2333 | break; |
088b1e42 | 2334 | } |
b3806b43 SR |
2335 | |
2336 | trace_consume(iter); | |
2337 | ||
2338 | if (iter->seq.len >= cnt) | |
2339 | break; | |
b3806b43 SR |
2340 | } |
2341 | ||
d4c5a2f5 | 2342 | for_each_cpu_mask(cpu, mask) { |
b3806b43 | 2343 | data = iter->tr->data[cpu]; |
92205c23 | 2344 | __raw_spin_unlock(&data->lock); |
2e0f5761 IM |
2345 | } |
2346 | ||
2347 | for_each_cpu_mask(cpu, mask) { | |
2348 | data = iter->tr->data[cpu]; | |
b3806b43 SR |
2349 | atomic_dec(&data->disabled); |
2350 | } | |
25770467 | 2351 | #ifdef CONFIG_FTRACE |
2e0f5761 | 2352 | ftrace_enabled = ftrace_save; |
25770467 | 2353 | #endif |
b3806b43 SR |
2354 | local_irq_restore(flags); |
2355 | ||
2356 | /* Now copy what we have to the user */ | |
2357 | read = iter->seq.len; | |
2358 | if (read > cnt) | |
2359 | read = cnt; | |
2360 | ||
2361 | ret = copy_to_user(ubuf, iter->seq.buffer, read); | |
2362 | ||
2363 | if (read < iter->seq.len) | |
2364 | start = read; | |
2365 | else | |
2366 | trace_seq_reset(&iter->seq); | |
2367 | ||
2368 | if (ret) | |
2369 | read = -EFAULT; | |
2370 | ||
2371 | return read; | |
2372 | } | |
2373 | ||
a98a3c3f SR |
2374 | static ssize_t |
2375 | tracing_entries_read(struct file *filp, char __user *ubuf, | |
2376 | size_t cnt, loff_t *ppos) | |
2377 | { | |
2378 | struct trace_array *tr = filp->private_data; | |
2379 | char buf[64]; | |
2380 | int r; | |
2381 | ||
2382 | r = sprintf(buf, "%lu\n", tr->entries); | |
2383 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
2384 | } | |
2385 | ||
2386 | static ssize_t | |
2387 | tracing_entries_write(struct file *filp, const char __user *ubuf, | |
2388 | size_t cnt, loff_t *ppos) | |
2389 | { | |
2390 | unsigned long val; | |
2391 | char buf[64]; | |
c6caeeb1 | 2392 | int ret; |
a98a3c3f | 2393 | |
cffae437 SR |
2394 | if (cnt >= sizeof(buf)) |
2395 | return -EINVAL; | |
a98a3c3f SR |
2396 | |
2397 | if (copy_from_user(&buf, ubuf, cnt)) | |
2398 | return -EFAULT; | |
2399 | ||
2400 | buf[cnt] = 0; | |
2401 | ||
c6caeeb1 SR |
2402 | ret = strict_strtoul(buf, 10, &val); |
2403 | if (ret < 0) | |
2404 | return ret; | |
a98a3c3f SR |
2405 | |
2406 | /* must have at least 1 entry */ | |
2407 | if (!val) | |
2408 | return -EINVAL; | |
2409 | ||
2410 | mutex_lock(&trace_types_lock); | |
2411 | ||
2412 | if (current_trace != &no_tracer) { | |
2413 | cnt = -EBUSY; | |
2414 | pr_info("ftrace: set current_tracer to none" | |
2415 | " before modifying buffer size\n"); | |
2416 | goto out; | |
2417 | } | |
2418 | ||
2419 | if (val > global_trace.entries) { | |
2420 | while (global_trace.entries < val) { | |
2421 | if (trace_alloc_page()) { | |
2422 | cnt = -ENOMEM; | |
2423 | goto out; | |
2424 | } | |
2425 | } | |
2426 | } else { | |
2427 | /* include the number of entries in val (inc of page entries) */ | |
2428 | while (global_trace.entries > val + (ENTRIES_PER_PAGE - 1)) | |
2429 | trace_free_page(); | |
2430 | } | |
2431 | ||
2432 | filp->f_pos += cnt; | |
2433 | ||
2434 | out: | |
2435 | max_tr.entries = global_trace.entries; | |
2436 | mutex_unlock(&trace_types_lock); | |
2437 | ||
2438 | return cnt; | |
2439 | } | |
2440 | ||
bc0c38d1 | 2441 | static struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
2442 | .open = tracing_open_generic, |
2443 | .read = tracing_max_lat_read, | |
2444 | .write = tracing_max_lat_write, | |
bc0c38d1 SR |
2445 | }; |
2446 | ||
2447 | static struct file_operations tracing_ctrl_fops = { | |
4bf39a94 IM |
2448 | .open = tracing_open_generic, |
2449 | .read = tracing_ctrl_read, | |
2450 | .write = tracing_ctrl_write, | |
bc0c38d1 SR |
2451 | }; |
2452 | ||
2453 | static struct file_operations set_tracer_fops = { | |
4bf39a94 IM |
2454 | .open = tracing_open_generic, |
2455 | .read = tracing_set_trace_read, | |
2456 | .write = tracing_set_trace_write, | |
bc0c38d1 SR |
2457 | }; |
2458 | ||
b3806b43 | 2459 | static struct file_operations tracing_pipe_fops = { |
4bf39a94 | 2460 | .open = tracing_open_pipe, |
2a2cc8f7 | 2461 | .poll = tracing_poll_pipe, |
4bf39a94 IM |
2462 | .read = tracing_read_pipe, |
2463 | .release = tracing_release_pipe, | |
b3806b43 SR |
2464 | }; |
2465 | ||
a98a3c3f SR |
2466 | static struct file_operations tracing_entries_fops = { |
2467 | .open = tracing_open_generic, | |
2468 | .read = tracing_entries_read, | |
2469 | .write = tracing_entries_write, | |
2470 | }; | |
2471 | ||
bc0c38d1 SR |
2472 | #ifdef CONFIG_DYNAMIC_FTRACE |
2473 | ||
2474 | static ssize_t | |
2475 | tracing_read_long(struct file *filp, char __user *ubuf, | |
2476 | size_t cnt, loff_t *ppos) | |
2477 | { | |
2478 | unsigned long *p = filp->private_data; | |
2479 | char buf[64]; | |
2480 | int r; | |
2481 | ||
2482 | r = sprintf(buf, "%ld\n", *p); | |
4bf39a94 IM |
2483 | |
2484 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
bc0c38d1 SR |
2485 | } |
2486 | ||
2487 | static struct file_operations tracing_read_long_fops = { | |
4bf39a94 IM |
2488 | .open = tracing_open_generic, |
2489 | .read = tracing_read_long, | |
bc0c38d1 SR |
2490 | }; |
2491 | #endif | |
2492 | ||
2493 | static struct dentry *d_tracer; | |
2494 | ||
2495 | struct dentry *tracing_init_dentry(void) | |
2496 | { | |
2497 | static int once; | |
2498 | ||
2499 | if (d_tracer) | |
2500 | return d_tracer; | |
2501 | ||
2502 | d_tracer = debugfs_create_dir("tracing", NULL); | |
2503 | ||
2504 | if (!d_tracer && !once) { | |
2505 | once = 1; | |
2506 | pr_warning("Could not create debugfs directory 'tracing'\n"); | |
2507 | return NULL; | |
2508 | } | |
2509 | ||
2510 | return d_tracer; | |
2511 | } | |
2512 | ||
60a11774 SR |
2513 | #ifdef CONFIG_FTRACE_SELFTEST |
2514 | /* Let selftest have access to static functions in this file */ | |
2515 | #include "trace_selftest.c" | |
2516 | #endif | |
2517 | ||
bc0c38d1 SR |
2518 | static __init void tracer_init_debugfs(void) |
2519 | { | |
2520 | struct dentry *d_tracer; | |
2521 | struct dentry *entry; | |
2522 | ||
2523 | d_tracer = tracing_init_dentry(); | |
2524 | ||
2525 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, | |
2526 | &global_trace, &tracing_ctrl_fops); | |
2527 | if (!entry) | |
2528 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); | |
2529 | ||
2530 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, | |
2531 | NULL, &tracing_iter_fops); | |
2532 | if (!entry) | |
2533 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); | |
2534 | ||
c7078de1 IM |
2535 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
2536 | NULL, &tracing_cpumask_fops); | |
2537 | if (!entry) | |
2538 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); | |
2539 | ||
bc0c38d1 SR |
2540 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
2541 | &global_trace, &tracing_lt_fops); | |
2542 | if (!entry) | |
2543 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); | |
2544 | ||
2545 | entry = debugfs_create_file("trace", 0444, d_tracer, | |
2546 | &global_trace, &tracing_fops); | |
2547 | if (!entry) | |
2548 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2549 | ||
2550 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, | |
2551 | &global_trace, &show_traces_fops); | |
2552 | if (!entry) | |
2553 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2554 | ||
2555 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, | |
2556 | &global_trace, &set_tracer_fops); | |
2557 | if (!entry) | |
2558 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2559 | ||
2560 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, | |
2561 | &tracing_max_latency, | |
2562 | &tracing_max_lat_fops); | |
2563 | if (!entry) | |
2564 | pr_warning("Could not create debugfs " | |
2565 | "'tracing_max_latency' entry\n"); | |
2566 | ||
2567 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, | |
2568 | &tracing_thresh, &tracing_max_lat_fops); | |
2569 | if (!entry) | |
2570 | pr_warning("Could not create debugfs " | |
2571 | "'tracing_threash' entry\n"); | |
7bd2f24c IM |
2572 | entry = debugfs_create_file("README", 0644, d_tracer, |
2573 | NULL, &tracing_readme_fops); | |
2574 | if (!entry) | |
2575 | pr_warning("Could not create debugfs 'README' entry\n"); | |
2576 | ||
b3806b43 SR |
2577 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
2578 | NULL, &tracing_pipe_fops); | |
2579 | if (!entry) | |
2580 | pr_warning("Could not create debugfs " | |
2581 | "'tracing_threash' entry\n"); | |
bc0c38d1 | 2582 | |
a98a3c3f SR |
2583 | entry = debugfs_create_file("trace_entries", 0644, d_tracer, |
2584 | &global_trace, &tracing_entries_fops); | |
2585 | if (!entry) | |
2586 | pr_warning("Could not create debugfs " | |
2587 | "'tracing_threash' entry\n"); | |
2588 | ||
bc0c38d1 SR |
2589 | #ifdef CONFIG_DYNAMIC_FTRACE |
2590 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, | |
2591 | &ftrace_update_tot_cnt, | |
2592 | &tracing_read_long_fops); | |
2593 | if (!entry) | |
2594 | pr_warning("Could not create debugfs " | |
2595 | "'dyn_ftrace_total_info' entry\n"); | |
2596 | #endif | |
2597 | } | |
2598 | ||
4c11d7ae | 2599 | static int trace_alloc_page(void) |
bc0c38d1 | 2600 | { |
4c11d7ae | 2601 | struct trace_array_cpu *data; |
4c11d7ae SR |
2602 | struct page *page, *tmp; |
2603 | LIST_HEAD(pages); | |
c7aafc54 | 2604 | void *array; |
4c11d7ae SR |
2605 | int i; |
2606 | ||
2607 | /* first allocate a page for each CPU */ | |
2608 | for_each_possible_cpu(i) { | |
2609 | array = (void *)__get_free_page(GFP_KERNEL); | |
2610 | if (array == NULL) { | |
2611 | printk(KERN_ERR "tracer: failed to allocate page" | |
2612 | "for trace buffer!\n"); | |
2613 | goto free_pages; | |
2614 | } | |
2615 | ||
2616 | page = virt_to_page(array); | |
2617 | list_add(&page->lru, &pages); | |
2618 | ||
2619 | /* Only allocate if we are actually using the max trace */ | |
2620 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2621 | array = (void *)__get_free_page(GFP_KERNEL); | |
2622 | if (array == NULL) { | |
2623 | printk(KERN_ERR "tracer: failed to allocate page" | |
2624 | "for trace buffer!\n"); | |
2625 | goto free_pages; | |
2626 | } | |
2627 | page = virt_to_page(array); | |
2628 | list_add(&page->lru, &pages); | |
2629 | #endif | |
2630 | } | |
2631 | ||
2632 | /* Now that we successfully allocate a page per CPU, add them */ | |
2633 | for_each_possible_cpu(i) { | |
2634 | data = global_trace.data[i]; | |
2635 | page = list_entry(pages.next, struct page, lru); | |
c7aafc54 | 2636 | list_del_init(&page->lru); |
4c11d7ae SR |
2637 | list_add_tail(&page->lru, &data->trace_pages); |
2638 | ClearPageLRU(page); | |
2639 | ||
2640 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2641 | data = max_tr.data[i]; | |
2642 | page = list_entry(pages.next, struct page, lru); | |
c7aafc54 | 2643 | list_del_init(&page->lru); |
4c11d7ae SR |
2644 | list_add_tail(&page->lru, &data->trace_pages); |
2645 | SetPageLRU(page); | |
2646 | #endif | |
2647 | } | |
2648 | global_trace.entries += ENTRIES_PER_PAGE; | |
2649 | ||
2650 | return 0; | |
2651 | ||
2652 | free_pages: | |
2653 | list_for_each_entry_safe(page, tmp, &pages, lru) { | |
c7aafc54 | 2654 | list_del_init(&page->lru); |
4c11d7ae SR |
2655 | __free_page(page); |
2656 | } | |
2657 | return -ENOMEM; | |
bc0c38d1 SR |
2658 | } |
2659 | ||
a98a3c3f SR |
2660 | static int trace_free_page(void) |
2661 | { | |
2662 | struct trace_array_cpu *data; | |
2663 | struct page *page; | |
2664 | struct list_head *p; | |
2665 | int i; | |
2666 | int ret = 0; | |
2667 | ||
2668 | /* free one page from each buffer */ | |
2669 | for_each_possible_cpu(i) { | |
2670 | data = global_trace.data[i]; | |
2671 | p = data->trace_pages.next; | |
2672 | if (p == &data->trace_pages) { | |
2673 | /* should never happen */ | |
2674 | WARN_ON(1); | |
2675 | tracing_disabled = 1; | |
2676 | ret = -1; | |
2677 | break; | |
2678 | } | |
2679 | page = list_entry(p, struct page, lru); | |
2680 | ClearPageLRU(page); | |
2681 | list_del(&page->lru); | |
2682 | __free_page(page); | |
2683 | ||
2684 | tracing_reset(data); | |
2685 | ||
2686 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2687 | data = max_tr.data[i]; | |
2688 | p = data->trace_pages.next; | |
2689 | if (p == &data->trace_pages) { | |
2690 | /* should never happen */ | |
2691 | WARN_ON(1); | |
2692 | tracing_disabled = 1; | |
2693 | ret = -1; | |
2694 | break; | |
2695 | } | |
2696 | page = list_entry(p, struct page, lru); | |
2697 | ClearPageLRU(page); | |
2698 | list_del(&page->lru); | |
2699 | __free_page(page); | |
2700 | ||
2701 | tracing_reset(data); | |
2702 | #endif | |
2703 | } | |
2704 | global_trace.entries -= ENTRIES_PER_PAGE; | |
2705 | ||
2706 | return ret; | |
2707 | } | |
2708 | ||
bc0c38d1 SR |
2709 | __init static int tracer_alloc_buffers(void) |
2710 | { | |
4c11d7ae SR |
2711 | struct trace_array_cpu *data; |
2712 | void *array; | |
2713 | struct page *page; | |
2714 | int pages = 0; | |
60a11774 | 2715 | int ret = -ENOMEM; |
bc0c38d1 SR |
2716 | int i; |
2717 | ||
26994ead SR |
2718 | global_trace.ctrl = tracer_enabled; |
2719 | ||
4c11d7ae | 2720 | /* Allocate the first page for all buffers */ |
bc0c38d1 | 2721 | for_each_possible_cpu(i) { |
4c11d7ae | 2722 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
bc0c38d1 SR |
2723 | max_tr.data[i] = &per_cpu(max_data, i); |
2724 | ||
4c11d7ae | 2725 | array = (void *)__get_free_page(GFP_KERNEL); |
bc0c38d1 | 2726 | if (array == NULL) { |
4c11d7ae SR |
2727 | printk(KERN_ERR "tracer: failed to allocate page" |
2728 | "for trace buffer!\n"); | |
bc0c38d1 SR |
2729 | goto free_buffers; |
2730 | } | |
4c11d7ae SR |
2731 | |
2732 | /* set the array to the list */ | |
2733 | INIT_LIST_HEAD(&data->trace_pages); | |
2734 | page = virt_to_page(array); | |
2735 | list_add(&page->lru, &data->trace_pages); | |
2736 | /* use the LRU flag to differentiate the two buffers */ | |
2737 | ClearPageLRU(page); | |
bc0c38d1 | 2738 | |
a98a3c3f SR |
2739 | data->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
2740 | max_tr.data[i]->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; | |
2741 | ||
bc0c38d1 SR |
2742 | /* Only allocate if we are actually using the max trace */ |
2743 | #ifdef CONFIG_TRACER_MAX_TRACE | |
4c11d7ae | 2744 | array = (void *)__get_free_page(GFP_KERNEL); |
bc0c38d1 | 2745 | if (array == NULL) { |
4c11d7ae SR |
2746 | printk(KERN_ERR "tracer: failed to allocate page" |
2747 | "for trace buffer!\n"); | |
bc0c38d1 SR |
2748 | goto free_buffers; |
2749 | } | |
4c11d7ae SR |
2750 | |
2751 | INIT_LIST_HEAD(&max_tr.data[i]->trace_pages); | |
2752 | page = virt_to_page(array); | |
2753 | list_add(&page->lru, &max_tr.data[i]->trace_pages); | |
2754 | SetPageLRU(page); | |
bc0c38d1 SR |
2755 | #endif |
2756 | } | |
2757 | ||
2758 | /* | |
2759 | * Since we allocate by orders of pages, we may be able to | |
2760 | * round up a bit. | |
2761 | */ | |
4c11d7ae | 2762 | global_trace.entries = ENTRIES_PER_PAGE; |
4c11d7ae SR |
2763 | pages++; |
2764 | ||
2765 | while (global_trace.entries < trace_nr_entries) { | |
2766 | if (trace_alloc_page()) | |
2767 | break; | |
2768 | pages++; | |
2769 | } | |
89b2f978 | 2770 | max_tr.entries = global_trace.entries; |
bc0c38d1 | 2771 | |
4c11d7ae SR |
2772 | pr_info("tracer: %d pages allocated for %ld", |
2773 | pages, trace_nr_entries); | |
bc0c38d1 SR |
2774 | pr_info(" entries of %ld bytes\n", (long)TRACE_ENTRY_SIZE); |
2775 | pr_info(" actual entries %ld\n", global_trace.entries); | |
2776 | ||
2777 | tracer_init_debugfs(); | |
2778 | ||
2779 | trace_init_cmdlines(); | |
2780 | ||
2781 | register_tracer(&no_tracer); | |
2782 | current_trace = &no_tracer; | |
2783 | ||
60a11774 SR |
2784 | /* All seems OK, enable tracing */ |
2785 | tracing_disabled = 0; | |
2786 | ||
bc0c38d1 SR |
2787 | return 0; |
2788 | ||
2789 | free_buffers: | |
2790 | for (i-- ; i >= 0; i--) { | |
4c11d7ae | 2791 | struct page *page, *tmp; |
bc0c38d1 SR |
2792 | struct trace_array_cpu *data = global_trace.data[i]; |
2793 | ||
c7aafc54 | 2794 | if (data) { |
4c11d7ae SR |
2795 | list_for_each_entry_safe(page, tmp, |
2796 | &data->trace_pages, lru) { | |
c7aafc54 | 2797 | list_del_init(&page->lru); |
4c11d7ae SR |
2798 | __free_page(page); |
2799 | } | |
bc0c38d1 SR |
2800 | } |
2801 | ||
2802 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2803 | data = max_tr.data[i]; | |
c7aafc54 | 2804 | if (data) { |
4c11d7ae SR |
2805 | list_for_each_entry_safe(page, tmp, |
2806 | &data->trace_pages, lru) { | |
c7aafc54 | 2807 | list_del_init(&page->lru); |
4c11d7ae SR |
2808 | __free_page(page); |
2809 | } | |
bc0c38d1 SR |
2810 | } |
2811 | #endif | |
2812 | } | |
60a11774 | 2813 | return ret; |
bc0c38d1 | 2814 | } |
60a11774 | 2815 | fs_initcall(tracer_alloc_buffers); |