Commit | Line | Data |
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bc0c38d1 SR |
1 | /* |
2 | * ring buffer based function tracer | |
3 | * | |
4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> | |
5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> | |
6 | * | |
7 | * Originally taken from the RT patch by: | |
8 | * Arnaldo Carvalho de Melo <acme@redhat.com> | |
9 | * | |
10 | * Based on code from the latency_tracer, that is: | |
11 | * Copyright (C) 2004-2006 Ingo Molnar | |
12 | * Copyright (C) 2004 William Lee Irwin III | |
13 | */ | |
14 | #include <linux/utsrelease.h> | |
15 | #include <linux/kallsyms.h> | |
16 | #include <linux/seq_file.h> | |
17 | #include <linux/debugfs.h> | |
4c11d7ae | 18 | #include <linux/pagemap.h> |
bc0c38d1 SR |
19 | #include <linux/hardirq.h> |
20 | #include <linux/linkage.h> | |
21 | #include <linux/uaccess.h> | |
22 | #include <linux/ftrace.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/percpu.h> | |
25 | #include <linux/ctype.h> | |
26 | #include <linux/init.h> | |
2a2cc8f7 | 27 | #include <linux/poll.h> |
bc0c38d1 SR |
28 | #include <linux/gfp.h> |
29 | #include <linux/fs.h> | |
76094a2c | 30 | #include <linux/kprobes.h> |
3eefae99 | 31 | #include <linux/writeback.h> |
bc0c38d1 | 32 | |
86387f7e IM |
33 | #include <linux/stacktrace.h> |
34 | ||
bc0c38d1 SR |
35 | #include "trace.h" |
36 | ||
37 | unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX; | |
38 | unsigned long __read_mostly tracing_thresh; | |
39 | ||
ab46428c SR |
40 | static unsigned long __read_mostly tracing_nr_buffers; |
41 | static cpumask_t __read_mostly tracing_buffer_mask; | |
42 | ||
43 | #define for_each_tracing_cpu(cpu) \ | |
44 | for_each_cpu_mask(cpu, tracing_buffer_mask) | |
45 | ||
a98a3c3f SR |
46 | static int trace_alloc_page(void); |
47 | static int trace_free_page(void); | |
48 | ||
60a11774 SR |
49 | static int tracing_disabled = 1; |
50 | ||
3eefae99 SR |
51 | static unsigned long tracing_pages_allocated; |
52 | ||
72829bc3 | 53 | long |
bc0c38d1 SR |
54 | ns2usecs(cycle_t nsec) |
55 | { | |
56 | nsec += 500; | |
57 | do_div(nsec, 1000); | |
58 | return nsec; | |
59 | } | |
60 | ||
e309b41d | 61 | cycle_t ftrace_now(int cpu) |
750ed1a4 | 62 | { |
0fd9e0da | 63 | return cpu_clock(cpu); |
750ed1a4 IM |
64 | } |
65 | ||
4fcdae83 SR |
66 | /* |
67 | * The global_trace is the descriptor that holds the tracing | |
68 | * buffers for the live tracing. For each CPU, it contains | |
69 | * a link list of pages that will store trace entries. The | |
70 | * page descriptor of the pages in the memory is used to hold | |
71 | * the link list by linking the lru item in the page descriptor | |
72 | * to each of the pages in the buffer per CPU. | |
73 | * | |
74 | * For each active CPU there is a data field that holds the | |
75 | * pages for the buffer for that CPU. Each CPU has the same number | |
76 | * of pages allocated for its buffer. | |
77 | */ | |
bc0c38d1 SR |
78 | static struct trace_array global_trace; |
79 | ||
80 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); | |
81 | ||
4fcdae83 SR |
82 | /* |
83 | * The max_tr is used to snapshot the global_trace when a maximum | |
84 | * latency is reached. Some tracers will use this to store a maximum | |
85 | * trace while it continues examining live traces. | |
86 | * | |
87 | * The buffers for the max_tr are set up the same as the global_trace. | |
88 | * When a snapshot is taken, the link list of the max_tr is swapped | |
89 | * with the link list of the global_trace and the buffers are reset for | |
90 | * the global_trace so the tracing can continue. | |
91 | */ | |
bc0c38d1 SR |
92 | static struct trace_array max_tr; |
93 | ||
94 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); | |
95 | ||
4fcdae83 | 96 | /* tracer_enabled is used to toggle activation of a tracer */ |
26994ead | 97 | static int tracer_enabled = 1; |
4fcdae83 | 98 | |
60bc0800 SR |
99 | /* function tracing enabled */ |
100 | int ftrace_function_enabled; | |
101 | ||
4fcdae83 SR |
102 | /* |
103 | * trace_nr_entries is the number of entries that is allocated | |
104 | * for a buffer. Note, the number of entries is always rounded | |
105 | * to ENTRIES_PER_PAGE. | |
106 | */ | |
57422797 | 107 | static unsigned long trace_nr_entries = 65536UL; |
bc0c38d1 | 108 | |
4fcdae83 | 109 | /* trace_types holds a link list of available tracers. */ |
bc0c38d1 | 110 | static struct tracer *trace_types __read_mostly; |
4fcdae83 SR |
111 | |
112 | /* current_trace points to the tracer that is currently active */ | |
bc0c38d1 | 113 | static struct tracer *current_trace __read_mostly; |
4fcdae83 SR |
114 | |
115 | /* | |
116 | * max_tracer_type_len is used to simplify the allocating of | |
117 | * buffers to read userspace tracer names. We keep track of | |
118 | * the longest tracer name registered. | |
119 | */ | |
bc0c38d1 SR |
120 | static int max_tracer_type_len; |
121 | ||
4fcdae83 SR |
122 | /* |
123 | * trace_types_lock is used to protect the trace_types list. | |
124 | * This lock is also used to keep user access serialized. | |
125 | * Accesses from userspace will grab this lock while userspace | |
126 | * activities happen inside the kernel. | |
127 | */ | |
bc0c38d1 | 128 | static DEFINE_MUTEX(trace_types_lock); |
4fcdae83 SR |
129 | |
130 | /* trace_wait is a waitqueue for tasks blocked on trace_poll */ | |
4e655519 IM |
131 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
132 | ||
4fcdae83 | 133 | /* trace_flags holds iter_ctrl options */ |
4e655519 IM |
134 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT; |
135 | ||
2b1bce17 AG |
136 | static notrace void no_trace_init(struct trace_array *tr) |
137 | { | |
138 | int cpu; | |
139 | ||
60bc0800 | 140 | ftrace_function_enabled = 0; |
2b1bce17 AG |
141 | if(tr->ctrl) |
142 | for_each_online_cpu(cpu) | |
143 | tracing_reset(tr->data[cpu]); | |
144 | tracer_enabled = 0; | |
145 | } | |
146 | ||
147 | /* dummy trace to disable tracing */ | |
148 | static struct tracer no_tracer __read_mostly = { | |
149 | .name = "none", | |
150 | .init = no_trace_init | |
151 | }; | |
152 | ||
153 | ||
4fcdae83 SR |
154 | /** |
155 | * trace_wake_up - wake up tasks waiting for trace input | |
156 | * | |
157 | * Simply wakes up any task that is blocked on the trace_wait | |
158 | * queue. These is used with trace_poll for tasks polling the trace. | |
159 | */ | |
4e655519 IM |
160 | void trace_wake_up(void) |
161 | { | |
017730c1 IM |
162 | /* |
163 | * The runqueue_is_locked() can fail, but this is the best we | |
164 | * have for now: | |
165 | */ | |
166 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) | |
4e655519 IM |
167 | wake_up(&trace_wait); |
168 | } | |
bc0c38d1 | 169 | |
4c11d7ae SR |
170 | #define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(struct trace_entry)) |
171 | ||
bc0c38d1 SR |
172 | static int __init set_nr_entries(char *str) |
173 | { | |
c6caeeb1 SR |
174 | unsigned long nr_entries; |
175 | int ret; | |
176 | ||
bc0c38d1 SR |
177 | if (!str) |
178 | return 0; | |
c6caeeb1 SR |
179 | ret = strict_strtoul(str, 0, &nr_entries); |
180 | /* nr_entries can not be zero */ | |
181 | if (ret < 0 || nr_entries == 0) | |
182 | return 0; | |
183 | trace_nr_entries = nr_entries; | |
bc0c38d1 SR |
184 | return 1; |
185 | } | |
186 | __setup("trace_entries=", set_nr_entries); | |
187 | ||
57f50be1 SR |
188 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
189 | { | |
190 | return nsecs / 1000; | |
191 | } | |
192 | ||
4fcdae83 SR |
193 | /* |
194 | * trace_flag_type is an enumeration that holds different | |
195 | * states when a trace occurs. These are: | |
196 | * IRQS_OFF - interrupts were disabled | |
197 | * NEED_RESCED - reschedule is requested | |
198 | * HARDIRQ - inside an interrupt handler | |
199 | * SOFTIRQ - inside a softirq handler | |
dd0e545f | 200 | * CONT - multiple entries hold the trace item |
4fcdae83 | 201 | */ |
bc0c38d1 SR |
202 | enum trace_flag_type { |
203 | TRACE_FLAG_IRQS_OFF = 0x01, | |
204 | TRACE_FLAG_NEED_RESCHED = 0x02, | |
205 | TRACE_FLAG_HARDIRQ = 0x04, | |
206 | TRACE_FLAG_SOFTIRQ = 0x08, | |
dd0e545f | 207 | TRACE_FLAG_CONT = 0x10, |
bc0c38d1 SR |
208 | }; |
209 | ||
4fcdae83 SR |
210 | /* |
211 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that | |
212 | * control the output of kernel symbols. | |
213 | */ | |
bc0c38d1 SR |
214 | #define TRACE_ITER_SYM_MASK \ |
215 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
216 | ||
4fcdae83 | 217 | /* These must match the bit postions in trace_iterator_flags */ |
bc0c38d1 SR |
218 | static const char *trace_options[] = { |
219 | "print-parent", | |
220 | "sym-offset", | |
221 | "sym-addr", | |
222 | "verbose", | |
f9896bf3 | 223 | "raw", |
5e3ca0ec | 224 | "hex", |
cb0f12aa | 225 | "bin", |
2a2cc8f7 | 226 | "block", |
86387f7e | 227 | "stacktrace", |
4ac3ba41 | 228 | "sched-tree", |
bc0c38d1 SR |
229 | NULL |
230 | }; | |
231 | ||
4fcdae83 SR |
232 | /* |
233 | * ftrace_max_lock is used to protect the swapping of buffers | |
234 | * when taking a max snapshot. The buffers themselves are | |
235 | * protected by per_cpu spinlocks. But the action of the swap | |
236 | * needs its own lock. | |
237 | * | |
238 | * This is defined as a raw_spinlock_t in order to help | |
239 | * with performance when lockdep debugging is enabled. | |
240 | */ | |
92205c23 SR |
241 | static raw_spinlock_t ftrace_max_lock = |
242 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; | |
bc0c38d1 SR |
243 | |
244 | /* | |
245 | * Copy the new maximum trace into the separate maximum-trace | |
246 | * structure. (this way the maximum trace is permanently saved, | |
247 | * for later retrieval via /debugfs/tracing/latency_trace) | |
248 | */ | |
e309b41d | 249 | static void |
bc0c38d1 SR |
250 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
251 | { | |
252 | struct trace_array_cpu *data = tr->data[cpu]; | |
253 | ||
254 | max_tr.cpu = cpu; | |
255 | max_tr.time_start = data->preempt_timestamp; | |
256 | ||
257 | data = max_tr.data[cpu]; | |
258 | data->saved_latency = tracing_max_latency; | |
259 | ||
260 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); | |
261 | data->pid = tsk->pid; | |
262 | data->uid = tsk->uid; | |
263 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; | |
264 | data->policy = tsk->policy; | |
265 | data->rt_priority = tsk->rt_priority; | |
266 | ||
267 | /* record this tasks comm */ | |
268 | tracing_record_cmdline(current); | |
269 | } | |
270 | ||
19384c03 SR |
271 | #define CHECK_COND(cond) \ |
272 | if (unlikely(cond)) { \ | |
273 | tracing_disabled = 1; \ | |
274 | WARN_ON(1); \ | |
275 | return -1; \ | |
276 | } | |
277 | ||
4fcdae83 SR |
278 | /** |
279 | * check_pages - integrity check of trace buffers | |
280 | * | |
281 | * As a safty measure we check to make sure the data pages have not | |
19384c03 | 282 | * been corrupted. |
4fcdae83 | 283 | */ |
19384c03 | 284 | int check_pages(struct trace_array_cpu *data) |
c7aafc54 IM |
285 | { |
286 | struct page *page, *tmp; | |
287 | ||
19384c03 SR |
288 | CHECK_COND(data->trace_pages.next->prev != &data->trace_pages); |
289 | CHECK_COND(data->trace_pages.prev->next != &data->trace_pages); | |
c7aafc54 IM |
290 | |
291 | list_for_each_entry_safe(page, tmp, &data->trace_pages, lru) { | |
19384c03 SR |
292 | CHECK_COND(page->lru.next->prev != &page->lru); |
293 | CHECK_COND(page->lru.prev->next != &page->lru); | |
c7aafc54 | 294 | } |
19384c03 SR |
295 | |
296 | return 0; | |
c7aafc54 IM |
297 | } |
298 | ||
4fcdae83 SR |
299 | /** |
300 | * head_page - page address of the first page in per_cpu buffer. | |
301 | * | |
302 | * head_page returns the page address of the first page in | |
303 | * a per_cpu buffer. This also preforms various consistency | |
304 | * checks to make sure the buffer has not been corrupted. | |
305 | */ | |
c7aafc54 IM |
306 | void *head_page(struct trace_array_cpu *data) |
307 | { | |
308 | struct page *page; | |
309 | ||
c7aafc54 IM |
310 | if (list_empty(&data->trace_pages)) |
311 | return NULL; | |
312 | ||
313 | page = list_entry(data->trace_pages.next, struct page, lru); | |
314 | BUG_ON(&page->lru == &data->trace_pages); | |
315 | ||
316 | return page_address(page); | |
317 | } | |
318 | ||
4fcdae83 SR |
319 | /** |
320 | * trace_seq_printf - sequence printing of trace information | |
321 | * @s: trace sequence descriptor | |
322 | * @fmt: printf format string | |
323 | * | |
324 | * The tracer may use either sequence operations or its own | |
325 | * copy to user routines. To simplify formating of a trace | |
326 | * trace_seq_printf is used to store strings into a special | |
327 | * buffer (@s). Then the output may be either used by | |
328 | * the sequencer or pulled into another buffer. | |
329 | */ | |
72829bc3 | 330 | int |
214023c3 SR |
331 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
332 | { | |
333 | int len = (PAGE_SIZE - 1) - s->len; | |
334 | va_list ap; | |
b3806b43 | 335 | int ret; |
214023c3 SR |
336 | |
337 | if (!len) | |
338 | return 0; | |
339 | ||
340 | va_start(ap, fmt); | |
b3806b43 | 341 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
214023c3 SR |
342 | va_end(ap); |
343 | ||
b3806b43 | 344 | /* If we can't write it all, don't bother writing anything */ |
72829bc3 | 345 | if (ret >= len) |
b3806b43 SR |
346 | return 0; |
347 | ||
348 | s->len += ret; | |
214023c3 SR |
349 | |
350 | return len; | |
351 | } | |
352 | ||
4fcdae83 SR |
353 | /** |
354 | * trace_seq_puts - trace sequence printing of simple string | |
355 | * @s: trace sequence descriptor | |
356 | * @str: simple string to record | |
357 | * | |
358 | * The tracer may use either the sequence operations or its own | |
359 | * copy to user routines. This function records a simple string | |
360 | * into a special buffer (@s) for later retrieval by a sequencer | |
361 | * or other mechanism. | |
362 | */ | |
e309b41d | 363 | static int |
214023c3 SR |
364 | trace_seq_puts(struct trace_seq *s, const char *str) |
365 | { | |
366 | int len = strlen(str); | |
367 | ||
368 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
b3806b43 | 369 | return 0; |
214023c3 SR |
370 | |
371 | memcpy(s->buffer + s->len, str, len); | |
372 | s->len += len; | |
373 | ||
374 | return len; | |
375 | } | |
376 | ||
e309b41d | 377 | static int |
214023c3 SR |
378 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
379 | { | |
380 | if (s->len >= (PAGE_SIZE - 1)) | |
381 | return 0; | |
382 | ||
383 | s->buffer[s->len++] = c; | |
384 | ||
385 | return 1; | |
386 | } | |
387 | ||
e309b41d | 388 | static int |
cb0f12aa IM |
389 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
390 | { | |
391 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
392 | return 0; | |
393 | ||
394 | memcpy(s->buffer + s->len, mem, len); | |
395 | s->len += len; | |
396 | ||
397 | return len; | |
398 | } | |
399 | ||
5e3ca0ec | 400 | #define HEX_CHARS 17 |
93dcc6ea | 401 | static const char hex2asc[] = "0123456789abcdef"; |
5e3ca0ec | 402 | |
e309b41d | 403 | static int |
5e3ca0ec IM |
404 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
405 | { | |
406 | unsigned char hex[HEX_CHARS]; | |
93dcc6ea | 407 | unsigned char *data = mem; |
5e3ca0ec IM |
408 | unsigned char byte; |
409 | int i, j; | |
410 | ||
411 | BUG_ON(len >= HEX_CHARS); | |
412 | ||
5e3ca0ec IM |
413 | #ifdef __BIG_ENDIAN |
414 | for (i = 0, j = 0; i < len; i++) { | |
415 | #else | |
416 | for (i = len-1, j = 0; i >= 0; i--) { | |
417 | #endif | |
418 | byte = data[i]; | |
419 | ||
93dcc6ea TG |
420 | hex[j++] = hex2asc[byte & 0x0f]; |
421 | hex[j++] = hex2asc[byte >> 4]; | |
5e3ca0ec | 422 | } |
93dcc6ea | 423 | hex[j++] = ' '; |
5e3ca0ec IM |
424 | |
425 | return trace_seq_putmem(s, hex, j); | |
426 | } | |
427 | ||
e309b41d | 428 | static void |
214023c3 SR |
429 | trace_seq_reset(struct trace_seq *s) |
430 | { | |
431 | s->len = 0; | |
6c6c2796 PP |
432 | s->readpos = 0; |
433 | } | |
434 | ||
435 | ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) | |
436 | { | |
437 | int len; | |
438 | int ret; | |
439 | ||
440 | if (s->len <= s->readpos) | |
441 | return -EBUSY; | |
442 | ||
443 | len = s->len - s->readpos; | |
444 | if (cnt > len) | |
445 | cnt = len; | |
446 | ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); | |
447 | if (ret) | |
448 | return -EFAULT; | |
449 | ||
450 | s->readpos += len; | |
451 | return cnt; | |
214023c3 SR |
452 | } |
453 | ||
e309b41d | 454 | static void |
214023c3 SR |
455 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
456 | { | |
457 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; | |
458 | ||
459 | s->buffer[len] = 0; | |
460 | seq_puts(m, s->buffer); | |
461 | ||
462 | trace_seq_reset(s); | |
463 | } | |
464 | ||
4fcdae83 SR |
465 | /* |
466 | * flip the trace buffers between two trace descriptors. | |
467 | * This usually is the buffers between the global_trace and | |
468 | * the max_tr to record a snapshot of a current trace. | |
469 | * | |
470 | * The ftrace_max_lock must be held. | |
471 | */ | |
e309b41d | 472 | static void |
c7aafc54 IM |
473 | flip_trace(struct trace_array_cpu *tr1, struct trace_array_cpu *tr2) |
474 | { | |
475 | struct list_head flip_pages; | |
476 | ||
477 | INIT_LIST_HEAD(&flip_pages); | |
478 | ||
93a588f4 | 479 | memcpy(&tr1->trace_head_idx, &tr2->trace_head_idx, |
c7aafc54 | 480 | sizeof(struct trace_array_cpu) - |
93a588f4 | 481 | offsetof(struct trace_array_cpu, trace_head_idx)); |
c7aafc54 IM |
482 | |
483 | check_pages(tr1); | |
484 | check_pages(tr2); | |
485 | list_splice_init(&tr1->trace_pages, &flip_pages); | |
486 | list_splice_init(&tr2->trace_pages, &tr1->trace_pages); | |
487 | list_splice_init(&flip_pages, &tr2->trace_pages); | |
488 | BUG_ON(!list_empty(&flip_pages)); | |
489 | check_pages(tr1); | |
490 | check_pages(tr2); | |
491 | } | |
492 | ||
4fcdae83 SR |
493 | /** |
494 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr | |
495 | * @tr: tracer | |
496 | * @tsk: the task with the latency | |
497 | * @cpu: The cpu that initiated the trace. | |
498 | * | |
499 | * Flip the buffers between the @tr and the max_tr and record information | |
500 | * about which task was the cause of this latency. | |
501 | */ | |
e309b41d | 502 | void |
bc0c38d1 SR |
503 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
504 | { | |
505 | struct trace_array_cpu *data; | |
bc0c38d1 SR |
506 | int i; |
507 | ||
4c11d7ae | 508 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 509 | __raw_spin_lock(&ftrace_max_lock); |
bc0c38d1 | 510 | /* clear out all the previous traces */ |
ab46428c | 511 | for_each_tracing_cpu(i) { |
bc0c38d1 | 512 | data = tr->data[i]; |
c7aafc54 | 513 | flip_trace(max_tr.data[i], data); |
89b2f978 | 514 | tracing_reset(data); |
bc0c38d1 SR |
515 | } |
516 | ||
517 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 518 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
519 | } |
520 | ||
521 | /** | |
522 | * update_max_tr_single - only copy one trace over, and reset the rest | |
523 | * @tr - tracer | |
524 | * @tsk - task with the latency | |
525 | * @cpu - the cpu of the buffer to copy. | |
4fcdae83 SR |
526 | * |
527 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. | |
bc0c38d1 | 528 | */ |
e309b41d | 529 | void |
bc0c38d1 SR |
530 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
531 | { | |
532 | struct trace_array_cpu *data = tr->data[cpu]; | |
bc0c38d1 SR |
533 | int i; |
534 | ||
4c11d7ae | 535 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 536 | __raw_spin_lock(&ftrace_max_lock); |
ab46428c | 537 | for_each_tracing_cpu(i) |
bc0c38d1 SR |
538 | tracing_reset(max_tr.data[i]); |
539 | ||
c7aafc54 | 540 | flip_trace(max_tr.data[cpu], data); |
89b2f978 | 541 | tracing_reset(data); |
bc0c38d1 SR |
542 | |
543 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 544 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
545 | } |
546 | ||
4fcdae83 SR |
547 | /** |
548 | * register_tracer - register a tracer with the ftrace system. | |
549 | * @type - the plugin for the tracer | |
550 | * | |
551 | * Register a new plugin tracer. | |
552 | */ | |
bc0c38d1 SR |
553 | int register_tracer(struct tracer *type) |
554 | { | |
555 | struct tracer *t; | |
556 | int len; | |
557 | int ret = 0; | |
558 | ||
559 | if (!type->name) { | |
560 | pr_info("Tracer must have a name\n"); | |
561 | return -1; | |
562 | } | |
563 | ||
564 | mutex_lock(&trace_types_lock); | |
565 | for (t = trace_types; t; t = t->next) { | |
566 | if (strcmp(type->name, t->name) == 0) { | |
567 | /* already found */ | |
568 | pr_info("Trace %s already registered\n", | |
569 | type->name); | |
570 | ret = -1; | |
571 | goto out; | |
572 | } | |
573 | } | |
574 | ||
60a11774 SR |
575 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
576 | if (type->selftest) { | |
577 | struct tracer *saved_tracer = current_trace; | |
578 | struct trace_array_cpu *data; | |
579 | struct trace_array *tr = &global_trace; | |
580 | int saved_ctrl = tr->ctrl; | |
581 | int i; | |
582 | /* | |
583 | * Run a selftest on this tracer. | |
584 | * Here we reset the trace buffer, and set the current | |
585 | * tracer to be this tracer. The tracer can then run some | |
586 | * internal tracing to verify that everything is in order. | |
587 | * If we fail, we do not register this tracer. | |
588 | */ | |
ab46428c | 589 | for_each_tracing_cpu(i) { |
60a11774 | 590 | data = tr->data[i]; |
c7aafc54 IM |
591 | if (!head_page(data)) |
592 | continue; | |
60a11774 SR |
593 | tracing_reset(data); |
594 | } | |
595 | current_trace = type; | |
596 | tr->ctrl = 0; | |
597 | /* the test is responsible for initializing and enabling */ | |
598 | pr_info("Testing tracer %s: ", type->name); | |
599 | ret = type->selftest(type, tr); | |
600 | /* the test is responsible for resetting too */ | |
601 | current_trace = saved_tracer; | |
602 | tr->ctrl = saved_ctrl; | |
603 | if (ret) { | |
604 | printk(KERN_CONT "FAILED!\n"); | |
605 | goto out; | |
606 | } | |
1d4db00a | 607 | /* Only reset on passing, to avoid touching corrupted buffers */ |
ab46428c | 608 | for_each_tracing_cpu(i) { |
1d4db00a SR |
609 | data = tr->data[i]; |
610 | if (!head_page(data)) | |
611 | continue; | |
612 | tracing_reset(data); | |
613 | } | |
60a11774 SR |
614 | printk(KERN_CONT "PASSED\n"); |
615 | } | |
616 | #endif | |
617 | ||
bc0c38d1 SR |
618 | type->next = trace_types; |
619 | trace_types = type; | |
620 | len = strlen(type->name); | |
621 | if (len > max_tracer_type_len) | |
622 | max_tracer_type_len = len; | |
60a11774 | 623 | |
bc0c38d1 SR |
624 | out: |
625 | mutex_unlock(&trace_types_lock); | |
626 | ||
627 | return ret; | |
628 | } | |
629 | ||
630 | void unregister_tracer(struct tracer *type) | |
631 | { | |
632 | struct tracer **t; | |
633 | int len; | |
634 | ||
635 | mutex_lock(&trace_types_lock); | |
636 | for (t = &trace_types; *t; t = &(*t)->next) { | |
637 | if (*t == type) | |
638 | goto found; | |
639 | } | |
640 | pr_info("Trace %s not registered\n", type->name); | |
641 | goto out; | |
642 | ||
643 | found: | |
644 | *t = (*t)->next; | |
645 | if (strlen(type->name) != max_tracer_type_len) | |
646 | goto out; | |
647 | ||
648 | max_tracer_type_len = 0; | |
649 | for (t = &trace_types; *t; t = &(*t)->next) { | |
650 | len = strlen((*t)->name); | |
651 | if (len > max_tracer_type_len) | |
652 | max_tracer_type_len = len; | |
653 | } | |
654 | out: | |
655 | mutex_unlock(&trace_types_lock); | |
656 | } | |
657 | ||
e309b41d | 658 | void tracing_reset(struct trace_array_cpu *data) |
bc0c38d1 SR |
659 | { |
660 | data->trace_idx = 0; | |
53d0aa77 | 661 | data->overrun = 0; |
93a588f4 SR |
662 | data->trace_head = data->trace_tail = head_page(data); |
663 | data->trace_head_idx = 0; | |
664 | data->trace_tail_idx = 0; | |
bc0c38d1 SR |
665 | } |
666 | ||
bc0c38d1 SR |
667 | #define SAVED_CMDLINES 128 |
668 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; | |
669 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; | |
670 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; | |
671 | static int cmdline_idx; | |
672 | static DEFINE_SPINLOCK(trace_cmdline_lock); | |
25b0b44a | 673 | |
25b0b44a SR |
674 | /* temporary disable recording */ |
675 | atomic_t trace_record_cmdline_disabled __read_mostly; | |
bc0c38d1 SR |
676 | |
677 | static void trace_init_cmdlines(void) | |
678 | { | |
679 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); | |
680 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); | |
681 | cmdline_idx = 0; | |
682 | } | |
683 | ||
e309b41d | 684 | void trace_stop_cmdline_recording(void); |
bc0c38d1 | 685 | |
e309b41d | 686 | static void trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
687 | { |
688 | unsigned map; | |
689 | unsigned idx; | |
690 | ||
691 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
692 | return; | |
693 | ||
694 | /* | |
695 | * It's not the end of the world if we don't get | |
696 | * the lock, but we also don't want to spin | |
697 | * nor do we want to disable interrupts, | |
698 | * so if we miss here, then better luck next time. | |
699 | */ | |
700 | if (!spin_trylock(&trace_cmdline_lock)) | |
701 | return; | |
702 | ||
703 | idx = map_pid_to_cmdline[tsk->pid]; | |
704 | if (idx >= SAVED_CMDLINES) { | |
705 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; | |
706 | ||
707 | map = map_cmdline_to_pid[idx]; | |
708 | if (map <= PID_MAX_DEFAULT) | |
709 | map_pid_to_cmdline[map] = (unsigned)-1; | |
710 | ||
711 | map_pid_to_cmdline[tsk->pid] = idx; | |
712 | ||
713 | cmdline_idx = idx; | |
714 | } | |
715 | ||
716 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); | |
717 | ||
718 | spin_unlock(&trace_cmdline_lock); | |
719 | } | |
720 | ||
e309b41d | 721 | static char *trace_find_cmdline(int pid) |
bc0c38d1 SR |
722 | { |
723 | char *cmdline = "<...>"; | |
724 | unsigned map; | |
725 | ||
726 | if (!pid) | |
727 | return "<idle>"; | |
728 | ||
729 | if (pid > PID_MAX_DEFAULT) | |
730 | goto out; | |
731 | ||
732 | map = map_pid_to_cmdline[pid]; | |
733 | if (map >= SAVED_CMDLINES) | |
734 | goto out; | |
735 | ||
736 | cmdline = saved_cmdlines[map]; | |
737 | ||
738 | out: | |
739 | return cmdline; | |
740 | } | |
741 | ||
e309b41d | 742 | void tracing_record_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
743 | { |
744 | if (atomic_read(&trace_record_cmdline_disabled)) | |
745 | return; | |
746 | ||
747 | trace_save_cmdline(tsk); | |
748 | } | |
749 | ||
e309b41d | 750 | static inline struct list_head * |
93a588f4 SR |
751 | trace_next_list(struct trace_array_cpu *data, struct list_head *next) |
752 | { | |
753 | /* | |
754 | * Roundrobin - but skip the head (which is not a real page): | |
755 | */ | |
756 | next = next->next; | |
757 | if (unlikely(next == &data->trace_pages)) | |
758 | next = next->next; | |
759 | BUG_ON(next == &data->trace_pages); | |
760 | ||
761 | return next; | |
762 | } | |
763 | ||
e309b41d | 764 | static inline void * |
93a588f4 SR |
765 | trace_next_page(struct trace_array_cpu *data, void *addr) |
766 | { | |
767 | struct list_head *next; | |
768 | struct page *page; | |
769 | ||
770 | page = virt_to_page(addr); | |
771 | ||
772 | next = trace_next_list(data, &page->lru); | |
773 | page = list_entry(next, struct page, lru); | |
774 | ||
775 | return page_address(page); | |
776 | } | |
777 | ||
e309b41d | 778 | static inline struct trace_entry * |
c7aafc54 | 779 | tracing_get_trace_entry(struct trace_array *tr, struct trace_array_cpu *data) |
bc0c38d1 SR |
780 | { |
781 | unsigned long idx, idx_next; | |
782 | struct trace_entry *entry; | |
783 | ||
4c11d7ae | 784 | data->trace_idx++; |
93a588f4 | 785 | idx = data->trace_head_idx; |
bc0c38d1 SR |
786 | idx_next = idx + 1; |
787 | ||
c7aafc54 IM |
788 | BUG_ON(idx * TRACE_ENTRY_SIZE >= PAGE_SIZE); |
789 | ||
93a588f4 | 790 | entry = data->trace_head + idx * TRACE_ENTRY_SIZE; |
4c11d7ae SR |
791 | |
792 | if (unlikely(idx_next >= ENTRIES_PER_PAGE)) { | |
93a588f4 | 793 | data->trace_head = trace_next_page(data, data->trace_head); |
bc0c38d1 SR |
794 | idx_next = 0; |
795 | } | |
796 | ||
93a588f4 SR |
797 | if (data->trace_head == data->trace_tail && |
798 | idx_next == data->trace_tail_idx) { | |
799 | /* overrun */ | |
53d0aa77 | 800 | data->overrun++; |
93a588f4 SR |
801 | data->trace_tail_idx++; |
802 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { | |
803 | data->trace_tail = | |
804 | trace_next_page(data, data->trace_tail); | |
805 | data->trace_tail_idx = 0; | |
806 | } | |
807 | } | |
808 | ||
809 | data->trace_head_idx = idx_next; | |
bc0c38d1 SR |
810 | |
811 | return entry; | |
812 | } | |
813 | ||
e309b41d | 814 | static inline void |
c7aafc54 | 815 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags) |
bc0c38d1 SR |
816 | { |
817 | struct task_struct *tsk = current; | |
818 | unsigned long pc; | |
819 | ||
820 | pc = preempt_count(); | |
821 | ||
2e2ca155 SR |
822 | entry->field.preempt_count = pc & 0xff; |
823 | entry->field.pid = (tsk) ? tsk->pid : 0; | |
824 | entry->field.t = ftrace_now(raw_smp_processor_id()); | |
825 | entry->field.flags = | |
826 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | | |
bc0c38d1 SR |
827 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
828 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | | |
829 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); | |
830 | } | |
831 | ||
e309b41d | 832 | void |
6fb44b71 SR |
833 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
834 | unsigned long ip, unsigned long parent_ip, unsigned long flags) | |
bc0c38d1 SR |
835 | { |
836 | struct trace_entry *entry; | |
dcb6308f | 837 | unsigned long irq_flags; |
bc0c38d1 | 838 | |
92205c23 SR |
839 | raw_local_irq_save(irq_flags); |
840 | __raw_spin_lock(&data->lock); | |
2e2ca155 | 841 | entry = tracing_get_trace_entry(tr, data); |
bc0c38d1 | 842 | tracing_generic_entry_update(entry, flags); |
2e2ca155 SR |
843 | entry->type = TRACE_FN; |
844 | entry->field.fn.ip = ip; | |
845 | entry->field.fn.parent_ip = parent_ip; | |
92205c23 SR |
846 | __raw_spin_unlock(&data->lock); |
847 | raw_local_irq_restore(irq_flags); | |
bc0c38d1 SR |
848 | } |
849 | ||
e309b41d | 850 | void |
2e0f5761 IM |
851 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
852 | unsigned long ip, unsigned long parent_ip, unsigned long flags) | |
853 | { | |
854 | if (likely(!atomic_read(&data->disabled))) | |
6fb44b71 | 855 | trace_function(tr, data, ip, parent_ip, flags); |
2e0f5761 IM |
856 | } |
857 | ||
bd8ac686 PP |
858 | #ifdef CONFIG_MMIOTRACE |
859 | void __trace_mmiotrace_rw(struct trace_array *tr, struct trace_array_cpu *data, | |
860 | struct mmiotrace_rw *rw) | |
861 | { | |
862 | struct trace_entry *entry; | |
863 | unsigned long irq_flags; | |
864 | ||
801a175b IM |
865 | raw_local_irq_save(irq_flags); |
866 | __raw_spin_lock(&data->lock); | |
867 | ||
2e2ca155 | 868 | entry = tracing_get_trace_entry(tr, data); |
bd8ac686 | 869 | tracing_generic_entry_update(entry, 0); |
2e2ca155 SR |
870 | entry->type = TRACE_MMIO_RW; |
871 | entry->field.mmiorw = *rw; | |
801a175b IM |
872 | |
873 | __raw_spin_unlock(&data->lock); | |
874 | raw_local_irq_restore(irq_flags); | |
bd8ac686 PP |
875 | |
876 | trace_wake_up(); | |
877 | } | |
878 | ||
879 | void __trace_mmiotrace_map(struct trace_array *tr, struct trace_array_cpu *data, | |
880 | struct mmiotrace_map *map) | |
881 | { | |
882 | struct trace_entry *entry; | |
883 | unsigned long irq_flags; | |
884 | ||
801a175b IM |
885 | raw_local_irq_save(irq_flags); |
886 | __raw_spin_lock(&data->lock); | |
887 | ||
2e2ca155 | 888 | entry = tracing_get_trace_entry(tr, data); |
bd8ac686 | 889 | tracing_generic_entry_update(entry, 0); |
2e2ca155 SR |
890 | entry->type = TRACE_MMIO_MAP; |
891 | entry->field.mmiomap = *map; | |
801a175b IM |
892 | |
893 | __raw_spin_unlock(&data->lock); | |
894 | raw_local_irq_restore(irq_flags); | |
bd8ac686 PP |
895 | |
896 | trace_wake_up(); | |
897 | } | |
898 | #endif | |
899 | ||
86387f7e IM |
900 | void __trace_stack(struct trace_array *tr, |
901 | struct trace_array_cpu *data, | |
902 | unsigned long flags, | |
903 | int skip) | |
904 | { | |
905 | struct trace_entry *entry; | |
906 | struct stack_trace trace; | |
907 | ||
908 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) | |
909 | return; | |
910 | ||
911 | entry = tracing_get_trace_entry(tr, data); | |
912 | tracing_generic_entry_update(entry, flags); | |
913 | entry->type = TRACE_STACK; | |
914 | ||
2e2ca155 | 915 | memset(&entry->field.stack, 0, sizeof(entry->field.stack)); |
86387f7e IM |
916 | |
917 | trace.nr_entries = 0; | |
918 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
919 | trace.skip = skip; | |
2e2ca155 | 920 | trace.entries = entry->field.stack.caller; |
86387f7e IM |
921 | |
922 | save_stack_trace(&trace); | |
f0a920d5 IM |
923 | } |
924 | ||
a4feb834 IM |
925 | void |
926 | __trace_special(void *__tr, void *__data, | |
927 | unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
928 | { | |
929 | struct trace_array_cpu *data = __data; | |
930 | struct trace_array *tr = __tr; | |
931 | struct trace_entry *entry; | |
932 | unsigned long irq_flags; | |
933 | ||
934 | raw_local_irq_save(irq_flags); | |
935 | __raw_spin_lock(&data->lock); | |
2e2ca155 | 936 | entry = tracing_get_trace_entry(tr, data); |
a4feb834 | 937 | tracing_generic_entry_update(entry, 0); |
2e2ca155 SR |
938 | entry->type = TRACE_SPECIAL; |
939 | entry->field.special.arg1 = arg1; | |
940 | entry->field.special.arg2 = arg2; | |
941 | entry->field.special.arg3 = arg3; | |
a4feb834 IM |
942 | __trace_stack(tr, data, irq_flags, 4); |
943 | __raw_spin_unlock(&data->lock); | |
944 | raw_local_irq_restore(irq_flags); | |
945 | ||
946 | trace_wake_up(); | |
947 | } | |
948 | ||
e309b41d | 949 | void |
bc0c38d1 SR |
950 | tracing_sched_switch_trace(struct trace_array *tr, |
951 | struct trace_array_cpu *data, | |
86387f7e IM |
952 | struct task_struct *prev, |
953 | struct task_struct *next, | |
bc0c38d1 SR |
954 | unsigned long flags) |
955 | { | |
956 | struct trace_entry *entry; | |
dcb6308f | 957 | unsigned long irq_flags; |
bc0c38d1 | 958 | |
92205c23 SR |
959 | raw_local_irq_save(irq_flags); |
960 | __raw_spin_lock(&data->lock); | |
2e2ca155 | 961 | entry = tracing_get_trace_entry(tr, data); |
bc0c38d1 | 962 | tracing_generic_entry_update(entry, flags); |
2e2ca155 SR |
963 | entry->type = TRACE_CTX; |
964 | entry->field.ctx.prev_pid = prev->pid; | |
965 | entry->field.ctx.prev_prio = prev->prio; | |
966 | entry->field.ctx.prev_state = prev->state; | |
967 | entry->field.ctx.next_pid = next->pid; | |
968 | entry->field.ctx.next_prio = next->prio; | |
969 | entry->field.ctx.next_state = next->state; | |
74f4e369 | 970 | __trace_stack(tr, data, flags, 5); |
92205c23 SR |
971 | __raw_spin_unlock(&data->lock); |
972 | raw_local_irq_restore(irq_flags); | |
bc0c38d1 SR |
973 | } |
974 | ||
57422797 IM |
975 | void |
976 | tracing_sched_wakeup_trace(struct trace_array *tr, | |
977 | struct trace_array_cpu *data, | |
86387f7e IM |
978 | struct task_struct *wakee, |
979 | struct task_struct *curr, | |
57422797 IM |
980 | unsigned long flags) |
981 | { | |
982 | struct trace_entry *entry; | |
983 | unsigned long irq_flags; | |
984 | ||
92205c23 SR |
985 | raw_local_irq_save(irq_flags); |
986 | __raw_spin_lock(&data->lock); | |
57422797 IM |
987 | entry = tracing_get_trace_entry(tr, data); |
988 | tracing_generic_entry_update(entry, flags); | |
989 | entry->type = TRACE_WAKE; | |
2e2ca155 SR |
990 | entry->field.ctx.prev_pid = curr->pid; |
991 | entry->field.ctx.prev_prio = curr->prio; | |
992 | entry->field.ctx.prev_state = curr->state; | |
993 | entry->field.ctx.next_pid = wakee->pid; | |
994 | entry->field.ctx.next_prio = wakee->prio; | |
995 | entry->field.ctx.next_state = wakee->state; | |
74f4e369 | 996 | __trace_stack(tr, data, flags, 6); |
92205c23 SR |
997 | __raw_spin_unlock(&data->lock); |
998 | raw_local_irq_restore(irq_flags); | |
017730c1 IM |
999 | |
1000 | trace_wake_up(); | |
57422797 IM |
1001 | } |
1002 | ||
4902f884 SR |
1003 | void |
1004 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
1005 | { | |
1006 | struct trace_array *tr = &global_trace; | |
1007 | struct trace_array_cpu *data; | |
1008 | unsigned long flags; | |
1009 | long disabled; | |
1010 | int cpu; | |
1011 | ||
1012 | if (tracing_disabled || current_trace == &no_tracer || !tr->ctrl) | |
1013 | return; | |
1014 | ||
1015 | local_irq_save(flags); | |
1016 | cpu = raw_smp_processor_id(); | |
1017 | data = tr->data[cpu]; | |
1018 | disabled = atomic_inc_return(&data->disabled); | |
1019 | ||
1020 | if (likely(disabled == 1)) | |
1021 | __trace_special(tr, data, arg1, arg2, arg3); | |
1022 | ||
1023 | atomic_dec(&data->disabled); | |
1024 | local_irq_restore(flags); | |
1025 | } | |
1026 | ||
2e0f5761 | 1027 | #ifdef CONFIG_FTRACE |
e309b41d | 1028 | static void |
2e0f5761 IM |
1029 | function_trace_call(unsigned long ip, unsigned long parent_ip) |
1030 | { | |
1031 | struct trace_array *tr = &global_trace; | |
1032 | struct trace_array_cpu *data; | |
1033 | unsigned long flags; | |
1034 | long disabled; | |
1035 | int cpu; | |
1036 | ||
60bc0800 | 1037 | if (unlikely(!ftrace_function_enabled)) |
2e0f5761 IM |
1038 | return; |
1039 | ||
ecea656d AS |
1040 | if (skip_trace(ip)) |
1041 | return; | |
1042 | ||
2e0f5761 IM |
1043 | local_irq_save(flags); |
1044 | cpu = raw_smp_processor_id(); | |
1045 | data = tr->data[cpu]; | |
1046 | disabled = atomic_inc_return(&data->disabled); | |
1047 | ||
1048 | if (likely(disabled == 1)) | |
6fb44b71 | 1049 | trace_function(tr, data, ip, parent_ip, flags); |
2e0f5761 IM |
1050 | |
1051 | atomic_dec(&data->disabled); | |
1052 | local_irq_restore(flags); | |
1053 | } | |
1054 | ||
1055 | static struct ftrace_ops trace_ops __read_mostly = | |
1056 | { | |
1057 | .func = function_trace_call, | |
1058 | }; | |
1059 | ||
e309b41d | 1060 | void tracing_start_function_trace(void) |
2e0f5761 | 1061 | { |
60bc0800 | 1062 | ftrace_function_enabled = 0; |
2e0f5761 | 1063 | register_ftrace_function(&trace_ops); |
60bc0800 SR |
1064 | if (tracer_enabled) |
1065 | ftrace_function_enabled = 1; | |
2e0f5761 IM |
1066 | } |
1067 | ||
e309b41d | 1068 | void tracing_stop_function_trace(void) |
2e0f5761 | 1069 | { |
60bc0800 | 1070 | ftrace_function_enabled = 0; |
2e0f5761 IM |
1071 | unregister_ftrace_function(&trace_ops); |
1072 | } | |
1073 | #endif | |
1074 | ||
bc0c38d1 SR |
1075 | enum trace_file_type { |
1076 | TRACE_FILE_LAT_FMT = 1, | |
1077 | }; | |
1078 | ||
dd0e545f | 1079 | /* Return the current entry. */ |
bc0c38d1 | 1080 | static struct trace_entry * |
4c11d7ae SR |
1081 | trace_entry_idx(struct trace_array *tr, struct trace_array_cpu *data, |
1082 | struct trace_iterator *iter, int cpu) | |
bc0c38d1 | 1083 | { |
4c11d7ae SR |
1084 | struct page *page; |
1085 | struct trace_entry *array; | |
bc0c38d1 | 1086 | |
4c11d7ae | 1087 | if (iter->next_idx[cpu] >= tr->entries || |
b3806b43 SR |
1088 | iter->next_idx[cpu] >= data->trace_idx || |
1089 | (data->trace_head == data->trace_tail && | |
1090 | data->trace_head_idx == data->trace_tail_idx)) | |
bc0c38d1 SR |
1091 | return NULL; |
1092 | ||
4c11d7ae | 1093 | if (!iter->next_page[cpu]) { |
93a588f4 SR |
1094 | /* Initialize the iterator for this cpu trace buffer */ |
1095 | WARN_ON(!data->trace_tail); | |
1096 | page = virt_to_page(data->trace_tail); | |
1097 | iter->next_page[cpu] = &page->lru; | |
1098 | iter->next_page_idx[cpu] = data->trace_tail_idx; | |
4c11d7ae | 1099 | } |
bc0c38d1 | 1100 | |
4c11d7ae | 1101 | page = list_entry(iter->next_page[cpu], struct page, lru); |
c7aafc54 IM |
1102 | BUG_ON(&data->trace_pages == &page->lru); |
1103 | ||
4c11d7ae SR |
1104 | array = page_address(page); |
1105 | ||
93a588f4 | 1106 | WARN_ON(iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE); |
4c11d7ae | 1107 | return &array[iter->next_page_idx[cpu]]; |
bc0c38d1 SR |
1108 | } |
1109 | ||
dd0e545f SR |
1110 | /* Increment the index counter of an iterator by one */ |
1111 | static void trace_iterator_increment(struct trace_iterator *iter, int cpu) | |
1112 | { | |
1113 | iter->idx++; | |
1114 | iter->next_idx[cpu]++; | |
1115 | iter->next_page_idx[cpu]++; | |
1116 | ||
1117 | if (iter->next_page_idx[cpu] >= ENTRIES_PER_PAGE) { | |
1118 | struct trace_array_cpu *data = iter->tr->data[cpu]; | |
1119 | ||
1120 | iter->next_page_idx[cpu] = 0; | |
1121 | iter->next_page[cpu] = | |
1122 | trace_next_list(data, iter->next_page[cpu]); | |
1123 | } | |
1124 | } | |
1125 | ||
e309b41d | 1126 | static struct trace_entry * |
dd0e545f SR |
1127 | trace_entry_next(struct trace_array *tr, struct trace_array_cpu *data, |
1128 | struct trace_iterator *iter, int cpu) | |
1129 | { | |
1130 | struct list_head *next_page; | |
1131 | struct trace_entry *ent; | |
1132 | int idx, next_idx, next_page_idx; | |
1133 | ||
1134 | ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); | |
1135 | ||
1136 | if (likely(!ent || ent->type != TRACE_CONT)) | |
1137 | return ent; | |
1138 | ||
1139 | /* save the iterator details */ | |
1140 | idx = iter->idx; | |
1141 | next_idx = iter->next_idx[cpu]; | |
1142 | next_page_idx = iter->next_page_idx[cpu]; | |
1143 | next_page = iter->next_page[cpu]; | |
1144 | ||
1145 | /* find a real entry */ | |
1146 | do { | |
1147 | trace_iterator_increment(iter, cpu); | |
1148 | ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); | |
1149 | } while (ent && ent->type != TRACE_CONT); | |
1150 | ||
1151 | /* reset the iterator */ | |
1152 | iter->idx = idx; | |
1153 | iter->next_idx[cpu] = next_idx; | |
1154 | iter->next_page_idx[cpu] = next_page_idx; | |
1155 | iter->next_page[cpu] = next_page; | |
1156 | ||
1157 | return ent; | |
1158 | } | |
1159 | ||
1160 | static struct trace_entry * | |
1161 | __find_next_entry(struct trace_iterator *iter, int *ent_cpu, int inc) | |
bc0c38d1 SR |
1162 | { |
1163 | struct trace_array *tr = iter->tr; | |
1164 | struct trace_entry *ent, *next = NULL; | |
1165 | int next_cpu = -1; | |
1166 | int cpu; | |
1167 | ||
ab46428c | 1168 | for_each_tracing_cpu(cpu) { |
c7aafc54 | 1169 | if (!head_page(tr->data[cpu])) |
bc0c38d1 | 1170 | continue; |
dd0e545f | 1171 | |
4c11d7ae | 1172 | ent = trace_entry_idx(tr, tr->data[cpu], iter, cpu); |
dd0e545f SR |
1173 | |
1174 | if (ent && ent->type == TRACE_CONT) { | |
1175 | struct trace_array_cpu *data = tr->data[cpu]; | |
1176 | ||
1177 | if (!inc) | |
1178 | ent = trace_entry_next(tr, data, iter, cpu); | |
1179 | else { | |
1180 | while (ent && ent->type == TRACE_CONT) { | |
1181 | trace_iterator_increment(iter, cpu); | |
1182 | ent = trace_entry_idx(tr, tr->data[cpu], | |
1183 | iter, cpu); | |
1184 | } | |
1185 | } | |
1186 | } | |
1187 | ||
cdd31cd2 IM |
1188 | /* |
1189 | * Pick the entry with the smallest timestamp: | |
1190 | */ | |
2e2ca155 | 1191 | if (ent && (!next || ent->field.t < next->field.t)) { |
bc0c38d1 SR |
1192 | next = ent; |
1193 | next_cpu = cpu; | |
1194 | } | |
1195 | } | |
1196 | ||
1197 | if (ent_cpu) | |
1198 | *ent_cpu = next_cpu; | |
1199 | ||
1200 | return next; | |
1201 | } | |
1202 | ||
dd0e545f SR |
1203 | /* Find the next real entry, without updating the iterator itself */ |
1204 | static struct trace_entry * | |
1205 | find_next_entry(struct trace_iterator *iter, int *ent_cpu) | |
bc0c38d1 | 1206 | { |
dd0e545f SR |
1207 | return __find_next_entry(iter, ent_cpu, 0); |
1208 | } | |
1209 | ||
1210 | /* Find the next real entry, and increment the iterator to the next entry */ | |
1211 | static void *find_next_entry_inc(struct trace_iterator *iter) | |
1212 | { | |
1213 | struct trace_entry *next; | |
1214 | int next_cpu = -1; | |
8c523a9d | 1215 | |
dd0e545f | 1216 | next = __find_next_entry(iter, &next_cpu, 1); |
bc0c38d1 | 1217 | |
dd0e545f SR |
1218 | iter->prev_ent = iter->ent; |
1219 | iter->prev_cpu = iter->cpu; | |
1220 | ||
1221 | iter->ent = next; | |
1222 | iter->cpu = next_cpu; | |
1223 | ||
1224 | if (next) | |
1225 | trace_iterator_increment(iter, iter->cpu); | |
1226 | ||
1227 | return next ? iter : NULL; | |
b3806b43 | 1228 | } |
bc0c38d1 | 1229 | |
e309b41d | 1230 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 SR |
1231 | { |
1232 | struct trace_array_cpu *data = iter->tr->data[iter->cpu]; | |
dd0e545f | 1233 | struct trace_entry *ent; |
b3806b43 | 1234 | |
dd0e545f | 1235 | again: |
b3806b43 SR |
1236 | data->trace_tail_idx++; |
1237 | if (data->trace_tail_idx >= ENTRIES_PER_PAGE) { | |
1238 | data->trace_tail = trace_next_page(data, data->trace_tail); | |
1239 | data->trace_tail_idx = 0; | |
1240 | } | |
4e3c3333 | 1241 | |
b3806b43 SR |
1242 | /* Check if we empty it, then reset the index */ |
1243 | if (data->trace_head == data->trace_tail && | |
1244 | data->trace_head_idx == data->trace_tail_idx) | |
1245 | data->trace_idx = 0; | |
b3806b43 | 1246 | |
dd0e545f SR |
1247 | ent = trace_entry_idx(iter->tr, iter->tr->data[iter->cpu], |
1248 | iter, iter->cpu); | |
1249 | if (ent && ent->type == TRACE_CONT) | |
1250 | goto again; | |
bc0c38d1 SR |
1251 | } |
1252 | ||
e309b41d | 1253 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
1254 | { |
1255 | struct trace_iterator *iter = m->private; | |
bc0c38d1 | 1256 | int i = (int)*pos; |
4e3c3333 | 1257 | void *ent; |
bc0c38d1 SR |
1258 | |
1259 | (*pos)++; | |
1260 | ||
1261 | /* can't go backwards */ | |
1262 | if (iter->idx > i) | |
1263 | return NULL; | |
1264 | ||
1265 | if (iter->idx < 0) | |
1266 | ent = find_next_entry_inc(iter); | |
1267 | else | |
1268 | ent = iter; | |
1269 | ||
1270 | while (ent && iter->idx < i) | |
1271 | ent = find_next_entry_inc(iter); | |
1272 | ||
1273 | iter->pos = *pos; | |
1274 | ||
bc0c38d1 SR |
1275 | return ent; |
1276 | } | |
1277 | ||
1278 | static void *s_start(struct seq_file *m, loff_t *pos) | |
1279 | { | |
1280 | struct trace_iterator *iter = m->private; | |
1281 | void *p = NULL; | |
1282 | loff_t l = 0; | |
1283 | int i; | |
1284 | ||
1285 | mutex_lock(&trace_types_lock); | |
1286 | ||
d15f57f2 SR |
1287 | if (!current_trace || current_trace != iter->trace) { |
1288 | mutex_unlock(&trace_types_lock); | |
bc0c38d1 | 1289 | return NULL; |
d15f57f2 | 1290 | } |
bc0c38d1 SR |
1291 | |
1292 | atomic_inc(&trace_record_cmdline_disabled); | |
1293 | ||
1294 | /* let the tracer grab locks here if needed */ | |
1295 | if (current_trace->start) | |
1296 | current_trace->start(iter); | |
1297 | ||
1298 | if (*pos != iter->pos) { | |
1299 | iter->ent = NULL; | |
1300 | iter->cpu = 0; | |
1301 | iter->idx = -1; | |
4e3c3333 IM |
1302 | iter->prev_ent = NULL; |
1303 | iter->prev_cpu = -1; | |
bc0c38d1 | 1304 | |
ab46428c | 1305 | for_each_tracing_cpu(i) { |
bc0c38d1 | 1306 | iter->next_idx[i] = 0; |
4c11d7ae SR |
1307 | iter->next_page[i] = NULL; |
1308 | } | |
bc0c38d1 SR |
1309 | |
1310 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) | |
1311 | ; | |
1312 | ||
1313 | } else { | |
4c11d7ae | 1314 | l = *pos - 1; |
bc0c38d1 SR |
1315 | p = s_next(m, p, &l); |
1316 | } | |
1317 | ||
1318 | return p; | |
1319 | } | |
1320 | ||
1321 | static void s_stop(struct seq_file *m, void *p) | |
1322 | { | |
1323 | struct trace_iterator *iter = m->private; | |
1324 | ||
1325 | atomic_dec(&trace_record_cmdline_disabled); | |
1326 | ||
1327 | /* let the tracer release locks here if needed */ | |
1328 | if (current_trace && current_trace == iter->trace && iter->trace->stop) | |
1329 | iter->trace->stop(iter); | |
1330 | ||
1331 | mutex_unlock(&trace_types_lock); | |
1332 | } | |
1333 | ||
76094a2c AS |
1334 | #define KRETPROBE_MSG "[unknown/kretprobe'd]" |
1335 | ||
1336 | #ifdef CONFIG_KRETPROBES | |
1337 | static inline int kretprobed(unsigned long addr) | |
1338 | { | |
1339 | return addr == (unsigned long)kretprobe_trampoline; | |
1340 | } | |
1341 | #else | |
1342 | static inline int kretprobed(unsigned long addr) | |
1343 | { | |
1344 | return 0; | |
1345 | } | |
1346 | #endif /* CONFIG_KRETPROBES */ | |
1347 | ||
b3806b43 | 1348 | static int |
214023c3 | 1349 | seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) |
bc0c38d1 SR |
1350 | { |
1351 | #ifdef CONFIG_KALLSYMS | |
1352 | char str[KSYM_SYMBOL_LEN]; | |
1353 | ||
1354 | kallsyms_lookup(address, NULL, NULL, NULL, str); | |
1355 | ||
b3806b43 | 1356 | return trace_seq_printf(s, fmt, str); |
bc0c38d1 | 1357 | #endif |
b3806b43 | 1358 | return 1; |
bc0c38d1 SR |
1359 | } |
1360 | ||
b3806b43 | 1361 | static int |
214023c3 SR |
1362 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
1363 | unsigned long address) | |
bc0c38d1 SR |
1364 | { |
1365 | #ifdef CONFIG_KALLSYMS | |
1366 | char str[KSYM_SYMBOL_LEN]; | |
1367 | ||
1368 | sprint_symbol(str, address); | |
b3806b43 | 1369 | return trace_seq_printf(s, fmt, str); |
bc0c38d1 | 1370 | #endif |
b3806b43 | 1371 | return 1; |
bc0c38d1 SR |
1372 | } |
1373 | ||
1374 | #ifndef CONFIG_64BIT | |
1375 | # define IP_FMT "%08lx" | |
1376 | #else | |
1377 | # define IP_FMT "%016lx" | |
1378 | #endif | |
1379 | ||
e309b41d | 1380 | static int |
214023c3 | 1381 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) |
bc0c38d1 | 1382 | { |
b3806b43 SR |
1383 | int ret; |
1384 | ||
1385 | if (!ip) | |
1386 | return trace_seq_printf(s, "0"); | |
bc0c38d1 SR |
1387 | |
1388 | if (sym_flags & TRACE_ITER_SYM_OFFSET) | |
b3806b43 | 1389 | ret = seq_print_sym_offset(s, "%s", ip); |
bc0c38d1 | 1390 | else |
b3806b43 SR |
1391 | ret = seq_print_sym_short(s, "%s", ip); |
1392 | ||
1393 | if (!ret) | |
1394 | return 0; | |
bc0c38d1 SR |
1395 | |
1396 | if (sym_flags & TRACE_ITER_SYM_ADDR) | |
b3806b43 SR |
1397 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
1398 | return ret; | |
bc0c38d1 SR |
1399 | } |
1400 | ||
e309b41d | 1401 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 SR |
1402 | { |
1403 | seq_puts(m, "# _------=> CPU# \n"); | |
1404 | seq_puts(m, "# / _-----=> irqs-off \n"); | |
1405 | seq_puts(m, "# | / _----=> need-resched \n"); | |
1406 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); | |
1407 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); | |
1408 | seq_puts(m, "# |||| / \n"); | |
1409 | seq_puts(m, "# ||||| delay \n"); | |
1410 | seq_puts(m, "# cmd pid ||||| time | caller \n"); | |
1411 | seq_puts(m, "# \\ / ||||| \\ | / \n"); | |
1412 | } | |
1413 | ||
e309b41d | 1414 | static void print_func_help_header(struct seq_file *m) |
bc0c38d1 SR |
1415 | { |
1416 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); | |
1417 | seq_puts(m, "# | | | | |\n"); | |
1418 | } | |
1419 | ||
1420 | ||
e309b41d | 1421 | static void |
bc0c38d1 SR |
1422 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
1423 | { | |
1424 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); | |
1425 | struct trace_array *tr = iter->tr; | |
1426 | struct trace_array_cpu *data = tr->data[tr->cpu]; | |
1427 | struct tracer *type = current_trace; | |
4c11d7ae SR |
1428 | unsigned long total = 0; |
1429 | unsigned long entries = 0; | |
bc0c38d1 SR |
1430 | int cpu; |
1431 | const char *name = "preemption"; | |
1432 | ||
1433 | if (type) | |
1434 | name = type->name; | |
1435 | ||
ab46428c | 1436 | for_each_tracing_cpu(cpu) { |
c7aafc54 | 1437 | if (head_page(tr->data[cpu])) { |
4c11d7ae SR |
1438 | total += tr->data[cpu]->trace_idx; |
1439 | if (tr->data[cpu]->trace_idx > tr->entries) | |
bc0c38d1 | 1440 | entries += tr->entries; |
4c11d7ae | 1441 | else |
bc0c38d1 SR |
1442 | entries += tr->data[cpu]->trace_idx; |
1443 | } | |
1444 | } | |
1445 | ||
1446 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", | |
1447 | name, UTS_RELEASE); | |
1448 | seq_puts(m, "-----------------------------------" | |
1449 | "---------------------------------\n"); | |
1450 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" | |
1451 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", | |
57f50be1 | 1452 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 1453 | entries, |
4c11d7ae | 1454 | total, |
bc0c38d1 SR |
1455 | tr->cpu, |
1456 | #if defined(CONFIG_PREEMPT_NONE) | |
1457 | "server", | |
1458 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
1459 | "desktop", | |
b5c21b45 | 1460 | #elif defined(CONFIG_PREEMPT) |
bc0c38d1 SR |
1461 | "preempt", |
1462 | #else | |
1463 | "unknown", | |
1464 | #endif | |
1465 | /* These are reserved for later use */ | |
1466 | 0, 0, 0, 0); | |
1467 | #ifdef CONFIG_SMP | |
1468 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
1469 | #else | |
1470 | seq_puts(m, ")\n"); | |
1471 | #endif | |
1472 | seq_puts(m, " -----------------\n"); | |
1473 | seq_printf(m, " | task: %.16s-%d " | |
1474 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", | |
1475 | data->comm, data->pid, data->uid, data->nice, | |
1476 | data->policy, data->rt_priority); | |
1477 | seq_puts(m, " -----------------\n"); | |
1478 | ||
1479 | if (data->critical_start) { | |
1480 | seq_puts(m, " => started at: "); | |
214023c3 SR |
1481 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
1482 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 | 1483 | seq_puts(m, "\n => ended at: "); |
214023c3 SR |
1484 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
1485 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 SR |
1486 | seq_puts(m, "\n"); |
1487 | } | |
1488 | ||
1489 | seq_puts(m, "\n"); | |
1490 | } | |
1491 | ||
e309b41d | 1492 | static void |
214023c3 | 1493 | lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) |
bc0c38d1 | 1494 | { |
2e2ca155 | 1495 | struct trace_field *field = &entry->field; |
bc0c38d1 SR |
1496 | int hardirq, softirq; |
1497 | char *comm; | |
1498 | ||
2e2ca155 | 1499 | comm = trace_find_cmdline(field->pid); |
bc0c38d1 | 1500 | |
2e2ca155 | 1501 | trace_seq_printf(s, "%8.8s-%-5d ", comm, field->pid); |
214023c3 SR |
1502 | trace_seq_printf(s, "%d", cpu); |
1503 | trace_seq_printf(s, "%c%c", | |
2e2ca155 SR |
1504 | (field->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.', |
1505 | ((field->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); | |
bc0c38d1 | 1506 | |
2e2ca155 SR |
1507 | hardirq = field->flags & TRACE_FLAG_HARDIRQ; |
1508 | softirq = field->flags & TRACE_FLAG_SOFTIRQ; | |
afc2abc0 | 1509 | if (hardirq && softirq) { |
214023c3 | 1510 | trace_seq_putc(s, 'H'); |
afc2abc0 IM |
1511 | } else { |
1512 | if (hardirq) { | |
214023c3 | 1513 | trace_seq_putc(s, 'h'); |
afc2abc0 | 1514 | } else { |
bc0c38d1 | 1515 | if (softirq) |
214023c3 | 1516 | trace_seq_putc(s, 's'); |
bc0c38d1 | 1517 | else |
214023c3 | 1518 | trace_seq_putc(s, '.'); |
bc0c38d1 SR |
1519 | } |
1520 | } | |
1521 | ||
2e2ca155 SR |
1522 | if (field->preempt_count) |
1523 | trace_seq_printf(s, "%x", field->preempt_count); | |
bc0c38d1 | 1524 | else |
214023c3 | 1525 | trace_seq_puts(s, "."); |
bc0c38d1 SR |
1526 | } |
1527 | ||
1528 | unsigned long preempt_mark_thresh = 100; | |
1529 | ||
e309b41d | 1530 | static void |
214023c3 | 1531 | lat_print_timestamp(struct trace_seq *s, unsigned long long abs_usecs, |
bc0c38d1 SR |
1532 | unsigned long rel_usecs) |
1533 | { | |
214023c3 | 1534 | trace_seq_printf(s, " %4lldus", abs_usecs); |
bc0c38d1 | 1535 | if (rel_usecs > preempt_mark_thresh) |
214023c3 | 1536 | trace_seq_puts(s, "!: "); |
bc0c38d1 | 1537 | else if (rel_usecs > 1) |
214023c3 | 1538 | trace_seq_puts(s, "+: "); |
bc0c38d1 | 1539 | else |
214023c3 | 1540 | trace_seq_puts(s, " : "); |
bc0c38d1 SR |
1541 | } |
1542 | ||
1543 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; | |
1544 | ||
dd0e545f SR |
1545 | static void |
1546 | trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter) | |
1547 | { | |
1548 | struct trace_array *tr = iter->tr; | |
1549 | struct trace_array_cpu *data = tr->data[iter->cpu]; | |
1550 | struct trace_entry *ent; | |
1551 | ||
1552 | ent = trace_entry_idx(tr, data, iter, iter->cpu); | |
1553 | if (!ent || ent->type != TRACE_CONT) { | |
1554 | trace_seq_putc(s, '\n'); | |
1555 | return; | |
1556 | } | |
1557 | ||
1558 | do { | |
1559 | trace_seq_printf(s, "%s", ent->cont.buf); | |
1560 | trace_iterator_increment(iter, iter->cpu); | |
1561 | ent = trace_entry_idx(tr, data, iter, iter->cpu); | |
1562 | } while (ent && ent->type == TRACE_CONT); | |
1563 | } | |
1564 | ||
e309b41d | 1565 | static int |
214023c3 | 1566 | print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) |
bc0c38d1 | 1567 | { |
214023c3 | 1568 | struct trace_seq *s = &iter->seq; |
bc0c38d1 SR |
1569 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
1570 | struct trace_entry *next_entry = find_next_entry(iter, NULL); | |
1571 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); | |
1572 | struct trace_entry *entry = iter->ent; | |
2e2ca155 | 1573 | struct trace_field *field = &entry->field; |
bc0c38d1 SR |
1574 | unsigned long abs_usecs; |
1575 | unsigned long rel_usecs; | |
1576 | char *comm; | |
bac524d3 | 1577 | int S, T; |
86387f7e | 1578 | int i; |
d17d9691 | 1579 | unsigned state; |
bc0c38d1 SR |
1580 | |
1581 | if (!next_entry) | |
1582 | next_entry = entry; | |
dd0e545f SR |
1583 | |
1584 | if (entry->type == TRACE_CONT) | |
1585 | return 1; | |
1586 | ||
2e2ca155 SR |
1587 | rel_usecs = ns2usecs(next_entry->field.t - entry->field.t); |
1588 | abs_usecs = ns2usecs(entry->field.t - iter->tr->time_start); | |
bc0c38d1 SR |
1589 | |
1590 | if (verbose) { | |
2e2ca155 | 1591 | comm = trace_find_cmdline(field->pid); |
214023c3 SR |
1592 | trace_seq_printf(s, "%16s %5d %d %d %08x %08x [%08lx]" |
1593 | " %ld.%03ldms (+%ld.%03ldms): ", | |
1594 | comm, | |
2e2ca155 SR |
1595 | field->pid, cpu, field->flags, |
1596 | field->preempt_count, trace_idx, | |
1597 | ns2usecs(field->t), | |
214023c3 SR |
1598 | abs_usecs/1000, |
1599 | abs_usecs % 1000, rel_usecs/1000, | |
1600 | rel_usecs % 1000); | |
bc0c38d1 | 1601 | } else { |
f29c73fe IM |
1602 | lat_print_generic(s, entry, cpu); |
1603 | lat_print_timestamp(s, abs_usecs, rel_usecs); | |
bc0c38d1 SR |
1604 | } |
1605 | switch (entry->type) { | |
1606 | case TRACE_FN: | |
2e2ca155 | 1607 | seq_print_ip_sym(s, field->fn.ip, sym_flags); |
214023c3 | 1608 | trace_seq_puts(s, " ("); |
2e2ca155 | 1609 | if (kretprobed(field->fn.parent_ip)) |
76094a2c AS |
1610 | trace_seq_puts(s, KRETPROBE_MSG); |
1611 | else | |
2e2ca155 | 1612 | seq_print_ip_sym(s, field->fn.parent_ip, sym_flags); |
214023c3 | 1613 | trace_seq_puts(s, ")\n"); |
bc0c38d1 SR |
1614 | break; |
1615 | case TRACE_CTX: | |
57422797 | 1616 | case TRACE_WAKE: |
2e2ca155 SR |
1617 | T = field->ctx.next_state < sizeof(state_to_char) ? |
1618 | state_to_char[field->ctx.next_state] : 'X'; | |
bac524d3 | 1619 | |
2e2ca155 SR |
1620 | state = field->ctx.prev_state ? |
1621 | __ffs(field->ctx.prev_state) + 1 : 0; | |
d17d9691 | 1622 | S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X'; |
2e2ca155 | 1623 | comm = trace_find_cmdline(field->ctx.next_pid); |
bac524d3 | 1624 | trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d:%c %s\n", |
2e2ca155 SR |
1625 | field->ctx.prev_pid, |
1626 | field->ctx.prev_prio, | |
57422797 | 1627 | S, entry->type == TRACE_CTX ? "==>" : " +", |
2e2ca155 SR |
1628 | field->ctx.next_pid, |
1629 | field->ctx.next_prio, | |
bac524d3 | 1630 | T, comm); |
bc0c38d1 | 1631 | break; |
f0a920d5 | 1632 | case TRACE_SPECIAL: |
88a4216c | 1633 | trace_seq_printf(s, "# %ld %ld %ld\n", |
2e2ca155 SR |
1634 | field->special.arg1, |
1635 | field->special.arg2, | |
1636 | field->special.arg3); | |
f0a920d5 | 1637 | break; |
86387f7e IM |
1638 | case TRACE_STACK: |
1639 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { | |
1640 | if (i) | |
1641 | trace_seq_puts(s, " <= "); | |
2e2ca155 | 1642 | seq_print_ip_sym(s, field->stack.caller[i], sym_flags); |
86387f7e IM |
1643 | } |
1644 | trace_seq_puts(s, "\n"); | |
1645 | break; | |
dd0e545f SR |
1646 | case TRACE_PRINT: |
1647 | seq_print_ip_sym(s, field->print.ip, sym_flags); | |
1648 | trace_seq_printf(s, ": %s", field->print.buf); | |
1649 | if (field->flags && TRACE_FLAG_CONT) | |
1650 | trace_seq_print_cont(s, iter); | |
1651 | break; | |
89b2f978 | 1652 | default: |
214023c3 | 1653 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
bc0c38d1 | 1654 | } |
f9896bf3 | 1655 | return 1; |
bc0c38d1 SR |
1656 | } |
1657 | ||
e309b41d | 1658 | static int print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 1659 | { |
214023c3 | 1660 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1661 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 1662 | struct trace_entry *entry; |
2e2ca155 | 1663 | struct trace_field *field; |
bc0c38d1 SR |
1664 | unsigned long usec_rem; |
1665 | unsigned long long t; | |
1666 | unsigned long secs; | |
1667 | char *comm; | |
b3806b43 | 1668 | int ret; |
bac524d3 | 1669 | int S, T; |
86387f7e | 1670 | int i; |
bc0c38d1 | 1671 | |
4e3c3333 | 1672 | entry = iter->ent; |
dd0e545f SR |
1673 | |
1674 | if (entry->type == TRACE_CONT) | |
1675 | return 1; | |
1676 | ||
2e2ca155 | 1677 | field = &entry->field; |
4e3c3333 | 1678 | |
2e2ca155 | 1679 | comm = trace_find_cmdline(iter->ent->field.pid); |
bc0c38d1 | 1680 | |
2e2ca155 | 1681 | t = ns2usecs(field->t); |
bc0c38d1 SR |
1682 | usec_rem = do_div(t, 1000000ULL); |
1683 | secs = (unsigned long)t; | |
1684 | ||
2e2ca155 | 1685 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, field->pid); |
f29c73fe IM |
1686 | if (!ret) |
1687 | return 0; | |
1688 | ret = trace_seq_printf(s, "[%02d] ", iter->cpu); | |
1689 | if (!ret) | |
1690 | return 0; | |
1691 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); | |
1692 | if (!ret) | |
1693 | return 0; | |
bc0c38d1 SR |
1694 | |
1695 | switch (entry->type) { | |
1696 | case TRACE_FN: | |
2e2ca155 | 1697 | ret = seq_print_ip_sym(s, field->fn.ip, sym_flags); |
b3806b43 SR |
1698 | if (!ret) |
1699 | return 0; | |
bc0c38d1 | 1700 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
2e2ca155 | 1701 | field->fn.parent_ip) { |
b3806b43 SR |
1702 | ret = trace_seq_printf(s, " <-"); |
1703 | if (!ret) | |
1704 | return 0; | |
2e2ca155 | 1705 | if (kretprobed(field->fn.parent_ip)) |
76094a2c AS |
1706 | ret = trace_seq_puts(s, KRETPROBE_MSG); |
1707 | else | |
2e2ca155 SR |
1708 | ret = seq_print_ip_sym(s, |
1709 | field->fn.parent_ip, | |
76094a2c | 1710 | sym_flags); |
b3806b43 SR |
1711 | if (!ret) |
1712 | return 0; | |
bc0c38d1 | 1713 | } |
b3806b43 SR |
1714 | ret = trace_seq_printf(s, "\n"); |
1715 | if (!ret) | |
1716 | return 0; | |
bc0c38d1 SR |
1717 | break; |
1718 | case TRACE_CTX: | |
57422797 | 1719 | case TRACE_WAKE: |
2e2ca155 SR |
1720 | S = field->ctx.prev_state < sizeof(state_to_char) ? |
1721 | state_to_char[field->ctx.prev_state] : 'X'; | |
1722 | T = field->ctx.next_state < sizeof(state_to_char) ? | |
1723 | state_to_char[field->ctx.next_state] : 'X'; | |
bac524d3 | 1724 | ret = trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d:%c\n", |
2e2ca155 SR |
1725 | field->ctx.prev_pid, |
1726 | field->ctx.prev_prio, | |
b3806b43 | 1727 | S, |
57422797 | 1728 | entry->type == TRACE_CTX ? "==>" : " +", |
2e2ca155 SR |
1729 | field->ctx.next_pid, |
1730 | field->ctx.next_prio, | |
bac524d3 | 1731 | T); |
b3806b43 SR |
1732 | if (!ret) |
1733 | return 0; | |
bc0c38d1 | 1734 | break; |
f0a920d5 | 1735 | case TRACE_SPECIAL: |
88a4216c | 1736 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
2e2ca155 SR |
1737 | field->special.arg1, |
1738 | field->special.arg2, | |
1739 | field->special.arg3); | |
f0a920d5 IM |
1740 | if (!ret) |
1741 | return 0; | |
1742 | break; | |
86387f7e IM |
1743 | case TRACE_STACK: |
1744 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { | |
1745 | if (i) { | |
1746 | ret = trace_seq_puts(s, " <= "); | |
1747 | if (!ret) | |
1748 | return 0; | |
1749 | } | |
2e2ca155 | 1750 | ret = seq_print_ip_sym(s, field->stack.caller[i], |
86387f7e IM |
1751 | sym_flags); |
1752 | if (!ret) | |
1753 | return 0; | |
1754 | } | |
1755 | ret = trace_seq_puts(s, "\n"); | |
1756 | if (!ret) | |
1757 | return 0; | |
1758 | break; | |
dd0e545f SR |
1759 | case TRACE_PRINT: |
1760 | seq_print_ip_sym(s, field->print.ip, sym_flags); | |
1761 | trace_seq_printf(s, ": %s", field->print.buf); | |
1762 | if (field->flags && TRACE_FLAG_CONT) | |
1763 | trace_seq_print_cont(s, iter); | |
1764 | break; | |
bc0c38d1 | 1765 | } |
b3806b43 | 1766 | return 1; |
bc0c38d1 SR |
1767 | } |
1768 | ||
e309b41d | 1769 | static int print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 IM |
1770 | { |
1771 | struct trace_seq *s = &iter->seq; | |
1772 | struct trace_entry *entry; | |
2e2ca155 | 1773 | struct trace_field *field; |
f9896bf3 | 1774 | int ret; |
bac524d3 | 1775 | int S, T; |
f9896bf3 IM |
1776 | |
1777 | entry = iter->ent; | |
dd0e545f SR |
1778 | |
1779 | if (entry->type == TRACE_CONT) | |
1780 | return 1; | |
1781 | ||
2e2ca155 | 1782 | field = &entry->field; |
f9896bf3 IM |
1783 | |
1784 | ret = trace_seq_printf(s, "%d %d %llu ", | |
2e2ca155 | 1785 | field->pid, iter->cpu, field->t); |
f9896bf3 IM |
1786 | if (!ret) |
1787 | return 0; | |
1788 | ||
1789 | switch (entry->type) { | |
1790 | case TRACE_FN: | |
1791 | ret = trace_seq_printf(s, "%x %x\n", | |
2e2ca155 SR |
1792 | field->fn.ip, |
1793 | field->fn.parent_ip); | |
f9896bf3 IM |
1794 | if (!ret) |
1795 | return 0; | |
1796 | break; | |
1797 | case TRACE_CTX: | |
57422797 | 1798 | case TRACE_WAKE: |
2e2ca155 SR |
1799 | S = field->ctx.prev_state < sizeof(state_to_char) ? |
1800 | state_to_char[field->ctx.prev_state] : 'X'; | |
1801 | T = field->ctx.next_state < sizeof(state_to_char) ? | |
1802 | state_to_char[field->ctx.next_state] : 'X'; | |
57422797 IM |
1803 | if (entry->type == TRACE_WAKE) |
1804 | S = '+'; | |
bac524d3 | 1805 | ret = trace_seq_printf(s, "%d %d %c %d %d %c\n", |
2e2ca155 SR |
1806 | field->ctx.prev_pid, |
1807 | field->ctx.prev_prio, | |
f9896bf3 | 1808 | S, |
2e2ca155 SR |
1809 | field->ctx.next_pid, |
1810 | field->ctx.next_prio, | |
bac524d3 | 1811 | T); |
f9896bf3 IM |
1812 | if (!ret) |
1813 | return 0; | |
1814 | break; | |
f0a920d5 | 1815 | case TRACE_SPECIAL: |
86387f7e | 1816 | case TRACE_STACK: |
88a4216c | 1817 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
2e2ca155 SR |
1818 | field->special.arg1, |
1819 | field->special.arg2, | |
1820 | field->special.arg3); | |
f0a920d5 IM |
1821 | if (!ret) |
1822 | return 0; | |
1823 | break; | |
dd0e545f SR |
1824 | case TRACE_PRINT: |
1825 | trace_seq_printf(s, "# %lx %s", | |
1826 | field->print.ip, field->print.buf); | |
1827 | if (field->flags && TRACE_FLAG_CONT) | |
1828 | trace_seq_print_cont(s, iter); | |
1829 | break; | |
f9896bf3 IM |
1830 | } |
1831 | return 1; | |
1832 | } | |
1833 | ||
cb0f12aa IM |
1834 | #define SEQ_PUT_FIELD_RET(s, x) \ |
1835 | do { \ | |
1836 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ | |
1837 | return 0; \ | |
1838 | } while (0) | |
1839 | ||
5e3ca0ec IM |
1840 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
1841 | do { \ | |
1842 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ | |
1843 | return 0; \ | |
1844 | } while (0) | |
1845 | ||
e309b41d | 1846 | static int print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec IM |
1847 | { |
1848 | struct trace_seq *s = &iter->seq; | |
1849 | unsigned char newline = '\n'; | |
1850 | struct trace_entry *entry; | |
2e2ca155 | 1851 | struct trace_field *field; |
bac524d3 | 1852 | int S, T; |
5e3ca0ec IM |
1853 | |
1854 | entry = iter->ent; | |
dd0e545f SR |
1855 | |
1856 | if (entry->type == TRACE_CONT) | |
1857 | return 1; | |
1858 | ||
2e2ca155 | 1859 | field = &entry->field; |
5e3ca0ec | 1860 | |
2e2ca155 | 1861 | SEQ_PUT_HEX_FIELD_RET(s, field->pid); |
5e3ca0ec | 1862 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); |
2e2ca155 | 1863 | SEQ_PUT_HEX_FIELD_RET(s, field->t); |
5e3ca0ec IM |
1864 | |
1865 | switch (entry->type) { | |
1866 | case TRACE_FN: | |
2e2ca155 SR |
1867 | SEQ_PUT_HEX_FIELD_RET(s, field->fn.ip); |
1868 | SEQ_PUT_HEX_FIELD_RET(s, field->fn.parent_ip); | |
5e3ca0ec IM |
1869 | break; |
1870 | case TRACE_CTX: | |
57422797 | 1871 | case TRACE_WAKE: |
2e2ca155 SR |
1872 | S = field->ctx.prev_state < sizeof(state_to_char) ? |
1873 | state_to_char[field->ctx.prev_state] : 'X'; | |
1874 | T = field->ctx.next_state < sizeof(state_to_char) ? | |
1875 | state_to_char[field->ctx.next_state] : 'X'; | |
57422797 IM |
1876 | if (entry->type == TRACE_WAKE) |
1877 | S = '+'; | |
2e2ca155 SR |
1878 | SEQ_PUT_HEX_FIELD_RET(s, field->ctx.prev_pid); |
1879 | SEQ_PUT_HEX_FIELD_RET(s, field->ctx.prev_prio); | |
5e3ca0ec | 1880 | SEQ_PUT_HEX_FIELD_RET(s, S); |
2e2ca155 SR |
1881 | SEQ_PUT_HEX_FIELD_RET(s, field->ctx.next_pid); |
1882 | SEQ_PUT_HEX_FIELD_RET(s, field->ctx.next_prio); | |
bac524d3 | 1883 | SEQ_PUT_HEX_FIELD_RET(s, T); |
5e3ca0ec IM |
1884 | break; |
1885 | case TRACE_SPECIAL: | |
86387f7e | 1886 | case TRACE_STACK: |
2e2ca155 SR |
1887 | SEQ_PUT_HEX_FIELD_RET(s, field->special.arg1); |
1888 | SEQ_PUT_HEX_FIELD_RET(s, field->special.arg2); | |
1889 | SEQ_PUT_HEX_FIELD_RET(s, field->special.arg3); | |
5e3ca0ec IM |
1890 | break; |
1891 | } | |
1892 | SEQ_PUT_FIELD_RET(s, newline); | |
1893 | ||
1894 | return 1; | |
1895 | } | |
1896 | ||
e309b41d | 1897 | static int print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa IM |
1898 | { |
1899 | struct trace_seq *s = &iter->seq; | |
1900 | struct trace_entry *entry; | |
2e2ca155 | 1901 | struct trace_field *field; |
cb0f12aa IM |
1902 | |
1903 | entry = iter->ent; | |
dd0e545f SR |
1904 | |
1905 | if (entry->type == TRACE_CONT) | |
1906 | return 1; | |
1907 | ||
2e2ca155 | 1908 | field = &entry->field; |
cb0f12aa | 1909 | |
2e2ca155 SR |
1910 | SEQ_PUT_FIELD_RET(s, field->pid); |
1911 | SEQ_PUT_FIELD_RET(s, field->cpu); | |
1912 | SEQ_PUT_FIELD_RET(s, field->t); | |
cb0f12aa IM |
1913 | |
1914 | switch (entry->type) { | |
1915 | case TRACE_FN: | |
2e2ca155 SR |
1916 | SEQ_PUT_FIELD_RET(s, field->fn.ip); |
1917 | SEQ_PUT_FIELD_RET(s, field->fn.parent_ip); | |
cb0f12aa IM |
1918 | break; |
1919 | case TRACE_CTX: | |
2e2ca155 SR |
1920 | SEQ_PUT_FIELD_RET(s, field->ctx.prev_pid); |
1921 | SEQ_PUT_FIELD_RET(s, field->ctx.prev_prio); | |
1922 | SEQ_PUT_FIELD_RET(s, field->ctx.prev_state); | |
1923 | SEQ_PUT_FIELD_RET(s, field->ctx.next_pid); | |
1924 | SEQ_PUT_FIELD_RET(s, field->ctx.next_prio); | |
1925 | SEQ_PUT_FIELD_RET(s, field->ctx.next_state); | |
cb0f12aa | 1926 | break; |
f0a920d5 | 1927 | case TRACE_SPECIAL: |
86387f7e | 1928 | case TRACE_STACK: |
2e2ca155 SR |
1929 | SEQ_PUT_FIELD_RET(s, field->special.arg1); |
1930 | SEQ_PUT_FIELD_RET(s, field->special.arg2); | |
1931 | SEQ_PUT_FIELD_RET(s, field->special.arg3); | |
f0a920d5 | 1932 | break; |
cb0f12aa IM |
1933 | } |
1934 | return 1; | |
1935 | } | |
1936 | ||
bc0c38d1 SR |
1937 | static int trace_empty(struct trace_iterator *iter) |
1938 | { | |
1939 | struct trace_array_cpu *data; | |
1940 | int cpu; | |
1941 | ||
ab46428c | 1942 | for_each_tracing_cpu(cpu) { |
bc0c38d1 SR |
1943 | data = iter->tr->data[cpu]; |
1944 | ||
b3806b43 SR |
1945 | if (head_page(data) && data->trace_idx && |
1946 | (data->trace_tail != data->trace_head || | |
1947 | data->trace_tail_idx != data->trace_head_idx)) | |
bc0c38d1 SR |
1948 | return 0; |
1949 | } | |
1950 | return 1; | |
1951 | } | |
1952 | ||
f9896bf3 IM |
1953 | static int print_trace_line(struct trace_iterator *iter) |
1954 | { | |
72829bc3 TG |
1955 | if (iter->trace && iter->trace->print_line) |
1956 | return iter->trace->print_line(iter); | |
1957 | ||
cb0f12aa IM |
1958 | if (trace_flags & TRACE_ITER_BIN) |
1959 | return print_bin_fmt(iter); | |
1960 | ||
5e3ca0ec IM |
1961 | if (trace_flags & TRACE_ITER_HEX) |
1962 | return print_hex_fmt(iter); | |
1963 | ||
f9896bf3 IM |
1964 | if (trace_flags & TRACE_ITER_RAW) |
1965 | return print_raw_fmt(iter); | |
1966 | ||
1967 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
1968 | return print_lat_fmt(iter, iter->idx, iter->cpu); | |
1969 | ||
1970 | return print_trace_fmt(iter); | |
1971 | } | |
1972 | ||
bc0c38d1 SR |
1973 | static int s_show(struct seq_file *m, void *v) |
1974 | { | |
1975 | struct trace_iterator *iter = v; | |
1976 | ||
1977 | if (iter->ent == NULL) { | |
1978 | if (iter->tr) { | |
1979 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
1980 | seq_puts(m, "#\n"); | |
1981 | } | |
1982 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { | |
1983 | /* print nothing if the buffers are empty */ | |
1984 | if (trace_empty(iter)) | |
1985 | return 0; | |
1986 | print_trace_header(m, iter); | |
1987 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1988 | print_lat_help_header(m); | |
1989 | } else { | |
1990 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1991 | print_func_help_header(m); | |
1992 | } | |
1993 | } else { | |
f9896bf3 | 1994 | print_trace_line(iter); |
214023c3 | 1995 | trace_print_seq(m, &iter->seq); |
bc0c38d1 SR |
1996 | } |
1997 | ||
1998 | return 0; | |
1999 | } | |
2000 | ||
2001 | static struct seq_operations tracer_seq_ops = { | |
4bf39a94 IM |
2002 | .start = s_start, |
2003 | .next = s_next, | |
2004 | .stop = s_stop, | |
2005 | .show = s_show, | |
bc0c38d1 SR |
2006 | }; |
2007 | ||
e309b41d | 2008 | static struct trace_iterator * |
bc0c38d1 SR |
2009 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
2010 | { | |
2011 | struct trace_iterator *iter; | |
2012 | ||
60a11774 SR |
2013 | if (tracing_disabled) { |
2014 | *ret = -ENODEV; | |
2015 | return NULL; | |
2016 | } | |
2017 | ||
bc0c38d1 SR |
2018 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
2019 | if (!iter) { | |
2020 | *ret = -ENOMEM; | |
2021 | goto out; | |
2022 | } | |
2023 | ||
2024 | mutex_lock(&trace_types_lock); | |
2025 | if (current_trace && current_trace->print_max) | |
2026 | iter->tr = &max_tr; | |
2027 | else | |
2028 | iter->tr = inode->i_private; | |
2029 | iter->trace = current_trace; | |
2030 | iter->pos = -1; | |
2031 | ||
2032 | /* TODO stop tracer */ | |
2033 | *ret = seq_open(file, &tracer_seq_ops); | |
2034 | if (!*ret) { | |
2035 | struct seq_file *m = file->private_data; | |
2036 | m->private = iter; | |
2037 | ||
2038 | /* stop the trace while dumping */ | |
60bc0800 | 2039 | if (iter->tr->ctrl) { |
bc0c38d1 | 2040 | tracer_enabled = 0; |
60bc0800 SR |
2041 | ftrace_function_enabled = 0; |
2042 | } | |
bc0c38d1 SR |
2043 | |
2044 | if (iter->trace && iter->trace->open) | |
2045 | iter->trace->open(iter); | |
2046 | } else { | |
2047 | kfree(iter); | |
2048 | iter = NULL; | |
2049 | } | |
2050 | mutex_unlock(&trace_types_lock); | |
2051 | ||
2052 | out: | |
2053 | return iter; | |
2054 | } | |
2055 | ||
2056 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
2057 | { | |
60a11774 SR |
2058 | if (tracing_disabled) |
2059 | return -ENODEV; | |
2060 | ||
bc0c38d1 SR |
2061 | filp->private_data = inode->i_private; |
2062 | return 0; | |
2063 | } | |
2064 | ||
2065 | int tracing_release(struct inode *inode, struct file *file) | |
2066 | { | |
2067 | struct seq_file *m = (struct seq_file *)file->private_data; | |
2068 | struct trace_iterator *iter = m->private; | |
2069 | ||
2070 | mutex_lock(&trace_types_lock); | |
2071 | if (iter->trace && iter->trace->close) | |
2072 | iter->trace->close(iter); | |
2073 | ||
2074 | /* reenable tracing if it was previously enabled */ | |
60bc0800 | 2075 | if (iter->tr->ctrl) { |
bc0c38d1 | 2076 | tracer_enabled = 1; |
60bc0800 SR |
2077 | /* |
2078 | * It is safe to enable function tracing even if it | |
2079 | * isn't used | |
2080 | */ | |
2081 | ftrace_function_enabled = 1; | |
2082 | } | |
bc0c38d1 SR |
2083 | mutex_unlock(&trace_types_lock); |
2084 | ||
2085 | seq_release(inode, file); | |
2086 | kfree(iter); | |
2087 | return 0; | |
2088 | } | |
2089 | ||
2090 | static int tracing_open(struct inode *inode, struct file *file) | |
2091 | { | |
2092 | int ret; | |
2093 | ||
2094 | __tracing_open(inode, file, &ret); | |
2095 | ||
2096 | return ret; | |
2097 | } | |
2098 | ||
2099 | static int tracing_lt_open(struct inode *inode, struct file *file) | |
2100 | { | |
2101 | struct trace_iterator *iter; | |
2102 | int ret; | |
2103 | ||
2104 | iter = __tracing_open(inode, file, &ret); | |
2105 | ||
2106 | if (!ret) | |
2107 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
2108 | ||
2109 | return ret; | |
2110 | } | |
2111 | ||
2112 | ||
e309b41d | 2113 | static void * |
bc0c38d1 SR |
2114 | t_next(struct seq_file *m, void *v, loff_t *pos) |
2115 | { | |
2116 | struct tracer *t = m->private; | |
2117 | ||
2118 | (*pos)++; | |
2119 | ||
2120 | if (t) | |
2121 | t = t->next; | |
2122 | ||
2123 | m->private = t; | |
2124 | ||
2125 | return t; | |
2126 | } | |
2127 | ||
2128 | static void *t_start(struct seq_file *m, loff_t *pos) | |
2129 | { | |
2130 | struct tracer *t = m->private; | |
2131 | loff_t l = 0; | |
2132 | ||
2133 | mutex_lock(&trace_types_lock); | |
2134 | for (; t && l < *pos; t = t_next(m, t, &l)) | |
2135 | ; | |
2136 | ||
2137 | return t; | |
2138 | } | |
2139 | ||
2140 | static void t_stop(struct seq_file *m, void *p) | |
2141 | { | |
2142 | mutex_unlock(&trace_types_lock); | |
2143 | } | |
2144 | ||
2145 | static int t_show(struct seq_file *m, void *v) | |
2146 | { | |
2147 | struct tracer *t = v; | |
2148 | ||
2149 | if (!t) | |
2150 | return 0; | |
2151 | ||
2152 | seq_printf(m, "%s", t->name); | |
2153 | if (t->next) | |
2154 | seq_putc(m, ' '); | |
2155 | else | |
2156 | seq_putc(m, '\n'); | |
2157 | ||
2158 | return 0; | |
2159 | } | |
2160 | ||
2161 | static struct seq_operations show_traces_seq_ops = { | |
4bf39a94 IM |
2162 | .start = t_start, |
2163 | .next = t_next, | |
2164 | .stop = t_stop, | |
2165 | .show = t_show, | |
bc0c38d1 SR |
2166 | }; |
2167 | ||
2168 | static int show_traces_open(struct inode *inode, struct file *file) | |
2169 | { | |
2170 | int ret; | |
2171 | ||
60a11774 SR |
2172 | if (tracing_disabled) |
2173 | return -ENODEV; | |
2174 | ||
bc0c38d1 SR |
2175 | ret = seq_open(file, &show_traces_seq_ops); |
2176 | if (!ret) { | |
2177 | struct seq_file *m = file->private_data; | |
2178 | m->private = trace_types; | |
2179 | } | |
2180 | ||
2181 | return ret; | |
2182 | } | |
2183 | ||
2184 | static struct file_operations tracing_fops = { | |
4bf39a94 IM |
2185 | .open = tracing_open, |
2186 | .read = seq_read, | |
2187 | .llseek = seq_lseek, | |
2188 | .release = tracing_release, | |
bc0c38d1 SR |
2189 | }; |
2190 | ||
2191 | static struct file_operations tracing_lt_fops = { | |
4bf39a94 IM |
2192 | .open = tracing_lt_open, |
2193 | .read = seq_read, | |
2194 | .llseek = seq_lseek, | |
2195 | .release = tracing_release, | |
bc0c38d1 SR |
2196 | }; |
2197 | ||
2198 | static struct file_operations show_traces_fops = { | |
c7078de1 IM |
2199 | .open = show_traces_open, |
2200 | .read = seq_read, | |
2201 | .release = seq_release, | |
2202 | }; | |
2203 | ||
36dfe925 IM |
2204 | /* |
2205 | * Only trace on a CPU if the bitmask is set: | |
2206 | */ | |
2207 | static cpumask_t tracing_cpumask = CPU_MASK_ALL; | |
2208 | ||
2209 | /* | |
2210 | * When tracing/tracing_cpu_mask is modified then this holds | |
2211 | * the new bitmask we are about to install: | |
2212 | */ | |
2213 | static cpumask_t tracing_cpumask_new; | |
2214 | ||
2215 | /* | |
2216 | * The tracer itself will not take this lock, but still we want | |
2217 | * to provide a consistent cpumask to user-space: | |
2218 | */ | |
2219 | static DEFINE_MUTEX(tracing_cpumask_update_lock); | |
2220 | ||
2221 | /* | |
2222 | * Temporary storage for the character representation of the | |
2223 | * CPU bitmask (and one more byte for the newline): | |
2224 | */ | |
2225 | static char mask_str[NR_CPUS + 1]; | |
2226 | ||
c7078de1 IM |
2227 | static ssize_t |
2228 | tracing_cpumask_read(struct file *filp, char __user *ubuf, | |
2229 | size_t count, loff_t *ppos) | |
2230 | { | |
36dfe925 | 2231 | int len; |
c7078de1 IM |
2232 | |
2233 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 IM |
2234 | |
2235 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); | |
2236 | if (count - len < 2) { | |
2237 | count = -EINVAL; | |
2238 | goto out_err; | |
2239 | } | |
2240 | len += sprintf(mask_str + len, "\n"); | |
2241 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); | |
2242 | ||
2243 | out_err: | |
c7078de1 IM |
2244 | mutex_unlock(&tracing_cpumask_update_lock); |
2245 | ||
2246 | return count; | |
2247 | } | |
2248 | ||
2249 | static ssize_t | |
2250 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, | |
2251 | size_t count, loff_t *ppos) | |
2252 | { | |
36dfe925 | 2253 | int err, cpu; |
c7078de1 IM |
2254 | |
2255 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 | 2256 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
c7078de1 | 2257 | if (err) |
36dfe925 IM |
2258 | goto err_unlock; |
2259 | ||
92205c23 SR |
2260 | raw_local_irq_disable(); |
2261 | __raw_spin_lock(&ftrace_max_lock); | |
ab46428c | 2262 | for_each_tracing_cpu(cpu) { |
36dfe925 IM |
2263 | /* |
2264 | * Increase/decrease the disabled counter if we are | |
2265 | * about to flip a bit in the cpumask: | |
2266 | */ | |
2267 | if (cpu_isset(cpu, tracing_cpumask) && | |
2268 | !cpu_isset(cpu, tracing_cpumask_new)) { | |
2269 | atomic_inc(&global_trace.data[cpu]->disabled); | |
2270 | } | |
2271 | if (!cpu_isset(cpu, tracing_cpumask) && | |
2272 | cpu_isset(cpu, tracing_cpumask_new)) { | |
2273 | atomic_dec(&global_trace.data[cpu]->disabled); | |
2274 | } | |
2275 | } | |
92205c23 SR |
2276 | __raw_spin_unlock(&ftrace_max_lock); |
2277 | raw_local_irq_enable(); | |
36dfe925 IM |
2278 | |
2279 | tracing_cpumask = tracing_cpumask_new; | |
2280 | ||
2281 | mutex_unlock(&tracing_cpumask_update_lock); | |
c7078de1 IM |
2282 | |
2283 | return count; | |
36dfe925 IM |
2284 | |
2285 | err_unlock: | |
2286 | mutex_unlock(&tracing_cpumask_update_lock); | |
2287 | ||
2288 | return err; | |
c7078de1 IM |
2289 | } |
2290 | ||
2291 | static struct file_operations tracing_cpumask_fops = { | |
2292 | .open = tracing_open_generic, | |
2293 | .read = tracing_cpumask_read, | |
2294 | .write = tracing_cpumask_write, | |
bc0c38d1 SR |
2295 | }; |
2296 | ||
2297 | static ssize_t | |
2298 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, | |
2299 | size_t cnt, loff_t *ppos) | |
2300 | { | |
2301 | char *buf; | |
2302 | int r = 0; | |
2303 | int len = 0; | |
2304 | int i; | |
2305 | ||
2306 | /* calulate max size */ | |
2307 | for (i = 0; trace_options[i]; i++) { | |
2308 | len += strlen(trace_options[i]); | |
2309 | len += 3; /* "no" and space */ | |
2310 | } | |
2311 | ||
2312 | /* +2 for \n and \0 */ | |
2313 | buf = kmalloc(len + 2, GFP_KERNEL); | |
2314 | if (!buf) | |
2315 | return -ENOMEM; | |
2316 | ||
2317 | for (i = 0; trace_options[i]; i++) { | |
2318 | if (trace_flags & (1 << i)) | |
2319 | r += sprintf(buf + r, "%s ", trace_options[i]); | |
2320 | else | |
2321 | r += sprintf(buf + r, "no%s ", trace_options[i]); | |
2322 | } | |
2323 | ||
2324 | r += sprintf(buf + r, "\n"); | |
2325 | WARN_ON(r >= len + 2); | |
2326 | ||
36dfe925 | 2327 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2328 | |
2329 | kfree(buf); | |
2330 | ||
2331 | return r; | |
2332 | } | |
2333 | ||
2334 | static ssize_t | |
2335 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, | |
2336 | size_t cnt, loff_t *ppos) | |
2337 | { | |
2338 | char buf[64]; | |
2339 | char *cmp = buf; | |
2340 | int neg = 0; | |
2341 | int i; | |
2342 | ||
cffae437 SR |
2343 | if (cnt >= sizeof(buf)) |
2344 | return -EINVAL; | |
bc0c38d1 SR |
2345 | |
2346 | if (copy_from_user(&buf, ubuf, cnt)) | |
2347 | return -EFAULT; | |
2348 | ||
2349 | buf[cnt] = 0; | |
2350 | ||
2351 | if (strncmp(buf, "no", 2) == 0) { | |
2352 | neg = 1; | |
2353 | cmp += 2; | |
2354 | } | |
2355 | ||
2356 | for (i = 0; trace_options[i]; i++) { | |
2357 | int len = strlen(trace_options[i]); | |
2358 | ||
2359 | if (strncmp(cmp, trace_options[i], len) == 0) { | |
2360 | if (neg) | |
2361 | trace_flags &= ~(1 << i); | |
2362 | else | |
2363 | trace_flags |= (1 << i); | |
2364 | break; | |
2365 | } | |
2366 | } | |
442e544c IM |
2367 | /* |
2368 | * If no option could be set, return an error: | |
2369 | */ | |
2370 | if (!trace_options[i]) | |
2371 | return -EINVAL; | |
bc0c38d1 SR |
2372 | |
2373 | filp->f_pos += cnt; | |
2374 | ||
2375 | return cnt; | |
2376 | } | |
2377 | ||
2378 | static struct file_operations tracing_iter_fops = { | |
c7078de1 IM |
2379 | .open = tracing_open_generic, |
2380 | .read = tracing_iter_ctrl_read, | |
2381 | .write = tracing_iter_ctrl_write, | |
bc0c38d1 SR |
2382 | }; |
2383 | ||
7bd2f24c IM |
2384 | static const char readme_msg[] = |
2385 | "tracing mini-HOWTO:\n\n" | |
2386 | "# mkdir /debug\n" | |
2387 | "# mount -t debugfs nodev /debug\n\n" | |
2388 | "# cat /debug/tracing/available_tracers\n" | |
2389 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" | |
2390 | "# cat /debug/tracing/current_tracer\n" | |
2391 | "none\n" | |
2392 | "# echo sched_switch > /debug/tracing/current_tracer\n" | |
2393 | "# cat /debug/tracing/current_tracer\n" | |
2394 | "sched_switch\n" | |
2395 | "# cat /debug/tracing/iter_ctrl\n" | |
2396 | "noprint-parent nosym-offset nosym-addr noverbose\n" | |
2397 | "# echo print-parent > /debug/tracing/iter_ctrl\n" | |
2398 | "# echo 1 > /debug/tracing/tracing_enabled\n" | |
2399 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" | |
2400 | "echo 0 > /debug/tracing/tracing_enabled\n" | |
2401 | ; | |
2402 | ||
2403 | static ssize_t | |
2404 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
2405 | size_t cnt, loff_t *ppos) | |
2406 | { | |
2407 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
2408 | readme_msg, strlen(readme_msg)); | |
2409 | } | |
2410 | ||
2411 | static struct file_operations tracing_readme_fops = { | |
c7078de1 IM |
2412 | .open = tracing_open_generic, |
2413 | .read = tracing_readme_read, | |
7bd2f24c IM |
2414 | }; |
2415 | ||
bc0c38d1 SR |
2416 | static ssize_t |
2417 | tracing_ctrl_read(struct file *filp, char __user *ubuf, | |
2418 | size_t cnt, loff_t *ppos) | |
2419 | { | |
2420 | struct trace_array *tr = filp->private_data; | |
2421 | char buf[64]; | |
2422 | int r; | |
2423 | ||
2424 | r = sprintf(buf, "%ld\n", tr->ctrl); | |
4e3c3333 | 2425 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2426 | } |
2427 | ||
2428 | static ssize_t | |
2429 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, | |
2430 | size_t cnt, loff_t *ppos) | |
2431 | { | |
2432 | struct trace_array *tr = filp->private_data; | |
bc0c38d1 | 2433 | char buf[64]; |
c6caeeb1 SR |
2434 | long val; |
2435 | int ret; | |
bc0c38d1 | 2436 | |
cffae437 SR |
2437 | if (cnt >= sizeof(buf)) |
2438 | return -EINVAL; | |
bc0c38d1 SR |
2439 | |
2440 | if (copy_from_user(&buf, ubuf, cnt)) | |
2441 | return -EFAULT; | |
2442 | ||
2443 | buf[cnt] = 0; | |
2444 | ||
c6caeeb1 SR |
2445 | ret = strict_strtoul(buf, 10, &val); |
2446 | if (ret < 0) | |
2447 | return ret; | |
bc0c38d1 SR |
2448 | |
2449 | val = !!val; | |
2450 | ||
2451 | mutex_lock(&trace_types_lock); | |
2452 | if (tr->ctrl ^ val) { | |
2453 | if (val) | |
2454 | tracer_enabled = 1; | |
2455 | else | |
2456 | tracer_enabled = 0; | |
2457 | ||
2458 | tr->ctrl = val; | |
2459 | ||
2460 | if (current_trace && current_trace->ctrl_update) | |
2461 | current_trace->ctrl_update(tr); | |
2462 | } | |
2463 | mutex_unlock(&trace_types_lock); | |
2464 | ||
2465 | filp->f_pos += cnt; | |
2466 | ||
2467 | return cnt; | |
2468 | } | |
2469 | ||
2470 | static ssize_t | |
2471 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
2472 | size_t cnt, loff_t *ppos) | |
2473 | { | |
2474 | char buf[max_tracer_type_len+2]; | |
2475 | int r; | |
2476 | ||
2477 | mutex_lock(&trace_types_lock); | |
2478 | if (current_trace) | |
2479 | r = sprintf(buf, "%s\n", current_trace->name); | |
2480 | else | |
2481 | r = sprintf(buf, "\n"); | |
2482 | mutex_unlock(&trace_types_lock); | |
2483 | ||
4bf39a94 | 2484 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2485 | } |
2486 | ||
2487 | static ssize_t | |
2488 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
2489 | size_t cnt, loff_t *ppos) | |
2490 | { | |
2491 | struct trace_array *tr = &global_trace; | |
2492 | struct tracer *t; | |
2493 | char buf[max_tracer_type_len+1]; | |
2494 | int i; | |
2495 | ||
2496 | if (cnt > max_tracer_type_len) | |
2497 | cnt = max_tracer_type_len; | |
2498 | ||
2499 | if (copy_from_user(&buf, ubuf, cnt)) | |
2500 | return -EFAULT; | |
2501 | ||
2502 | buf[cnt] = 0; | |
2503 | ||
2504 | /* strip ending whitespace. */ | |
2505 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
2506 | buf[i] = 0; | |
2507 | ||
2508 | mutex_lock(&trace_types_lock); | |
2509 | for (t = trace_types; t; t = t->next) { | |
2510 | if (strcmp(t->name, buf) == 0) | |
2511 | break; | |
2512 | } | |
2513 | if (!t || t == current_trace) | |
2514 | goto out; | |
2515 | ||
2516 | if (current_trace && current_trace->reset) | |
2517 | current_trace->reset(tr); | |
2518 | ||
2519 | current_trace = t; | |
2520 | if (t->init) | |
2521 | t->init(tr); | |
2522 | ||
2523 | out: | |
2524 | mutex_unlock(&trace_types_lock); | |
2525 | ||
2526 | filp->f_pos += cnt; | |
2527 | ||
2528 | return cnt; | |
2529 | } | |
2530 | ||
2531 | static ssize_t | |
2532 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
2533 | size_t cnt, loff_t *ppos) | |
2534 | { | |
2535 | unsigned long *ptr = filp->private_data; | |
2536 | char buf[64]; | |
2537 | int r; | |
2538 | ||
cffae437 | 2539 | r = snprintf(buf, sizeof(buf), "%ld\n", |
bc0c38d1 | 2540 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
cffae437 SR |
2541 | if (r > sizeof(buf)) |
2542 | r = sizeof(buf); | |
4bf39a94 | 2543 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2544 | } |
2545 | ||
2546 | static ssize_t | |
2547 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
2548 | size_t cnt, loff_t *ppos) | |
2549 | { | |
2550 | long *ptr = filp->private_data; | |
bc0c38d1 | 2551 | char buf[64]; |
c6caeeb1 SR |
2552 | long val; |
2553 | int ret; | |
bc0c38d1 | 2554 | |
cffae437 SR |
2555 | if (cnt >= sizeof(buf)) |
2556 | return -EINVAL; | |
bc0c38d1 SR |
2557 | |
2558 | if (copy_from_user(&buf, ubuf, cnt)) | |
2559 | return -EFAULT; | |
2560 | ||
2561 | buf[cnt] = 0; | |
2562 | ||
c6caeeb1 SR |
2563 | ret = strict_strtoul(buf, 10, &val); |
2564 | if (ret < 0) | |
2565 | return ret; | |
bc0c38d1 SR |
2566 | |
2567 | *ptr = val * 1000; | |
2568 | ||
2569 | return cnt; | |
2570 | } | |
2571 | ||
b3806b43 SR |
2572 | static atomic_t tracing_reader; |
2573 | ||
2574 | static int tracing_open_pipe(struct inode *inode, struct file *filp) | |
2575 | { | |
2576 | struct trace_iterator *iter; | |
2577 | ||
2578 | if (tracing_disabled) | |
2579 | return -ENODEV; | |
2580 | ||
2581 | /* We only allow for reader of the pipe */ | |
2582 | if (atomic_inc_return(&tracing_reader) != 1) { | |
2583 | atomic_dec(&tracing_reader); | |
2584 | return -EBUSY; | |
2585 | } | |
2586 | ||
2587 | /* create a buffer to store the information to pass to userspace */ | |
2588 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
2589 | if (!iter) | |
2590 | return -ENOMEM; | |
2591 | ||
107bad8b | 2592 | mutex_lock(&trace_types_lock); |
b3806b43 | 2593 | iter->tr = &global_trace; |
72829bc3 | 2594 | iter->trace = current_trace; |
b3806b43 SR |
2595 | filp->private_data = iter; |
2596 | ||
107bad8b SR |
2597 | if (iter->trace->pipe_open) |
2598 | iter->trace->pipe_open(iter); | |
2599 | mutex_unlock(&trace_types_lock); | |
2600 | ||
b3806b43 SR |
2601 | return 0; |
2602 | } | |
2603 | ||
2604 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
2605 | { | |
2606 | struct trace_iterator *iter = file->private_data; | |
2607 | ||
2608 | kfree(iter); | |
2609 | atomic_dec(&tracing_reader); | |
2610 | ||
2611 | return 0; | |
2612 | } | |
2613 | ||
2a2cc8f7 SSP |
2614 | static unsigned int |
2615 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) | |
2616 | { | |
2617 | struct trace_iterator *iter = filp->private_data; | |
2618 | ||
2619 | if (trace_flags & TRACE_ITER_BLOCK) { | |
2620 | /* | |
2621 | * Always select as readable when in blocking mode | |
2622 | */ | |
2623 | return POLLIN | POLLRDNORM; | |
afc2abc0 | 2624 | } else { |
2a2cc8f7 SSP |
2625 | if (!trace_empty(iter)) |
2626 | return POLLIN | POLLRDNORM; | |
2627 | poll_wait(filp, &trace_wait, poll_table); | |
2628 | if (!trace_empty(iter)) | |
2629 | return POLLIN | POLLRDNORM; | |
2630 | ||
2631 | return 0; | |
2632 | } | |
2633 | } | |
2634 | ||
b3806b43 SR |
2635 | /* |
2636 | * Consumer reader. | |
2637 | */ | |
2638 | static ssize_t | |
2639 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
2640 | size_t cnt, loff_t *ppos) | |
2641 | { | |
2642 | struct trace_iterator *iter = filp->private_data; | |
2643 | struct trace_array_cpu *data; | |
2644 | static cpumask_t mask; | |
b3806b43 | 2645 | unsigned long flags; |
25770467 | 2646 | #ifdef CONFIG_FTRACE |
2e0f5761 | 2647 | int ftrace_save; |
25770467 | 2648 | #endif |
b3806b43 | 2649 | int cpu; |
6c6c2796 | 2650 | ssize_t sret; |
b3806b43 SR |
2651 | |
2652 | /* return any leftover data */ | |
6c6c2796 PP |
2653 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
2654 | if (sret != -EBUSY) | |
2655 | return sret; | |
2656 | sret = 0; | |
b3806b43 | 2657 | |
6c6c2796 | 2658 | trace_seq_reset(&iter->seq); |
b3806b43 | 2659 | |
107bad8b SR |
2660 | mutex_lock(&trace_types_lock); |
2661 | if (iter->trace->read) { | |
6c6c2796 PP |
2662 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); |
2663 | if (sret) | |
107bad8b | 2664 | goto out; |
107bad8b SR |
2665 | } |
2666 | ||
b3806b43 | 2667 | while (trace_empty(iter)) { |
2dc8f095 | 2668 | |
107bad8b | 2669 | if ((filp->f_flags & O_NONBLOCK)) { |
6c6c2796 | 2670 | sret = -EAGAIN; |
107bad8b SR |
2671 | goto out; |
2672 | } | |
2dc8f095 | 2673 | |
b3806b43 SR |
2674 | /* |
2675 | * This is a make-shift waitqueue. The reason we don't use | |
2676 | * an actual wait queue is because: | |
2677 | * 1) we only ever have one waiter | |
2678 | * 2) the tracing, traces all functions, we don't want | |
2679 | * the overhead of calling wake_up and friends | |
2680 | * (and tracing them too) | |
2681 | * Anyway, this is really very primitive wakeup. | |
2682 | */ | |
2683 | set_current_state(TASK_INTERRUPTIBLE); | |
2684 | iter->tr->waiter = current; | |
2685 | ||
107bad8b SR |
2686 | mutex_unlock(&trace_types_lock); |
2687 | ||
9fe068e9 IM |
2688 | /* sleep for 100 msecs, and try again. */ |
2689 | schedule_timeout(HZ/10); | |
b3806b43 | 2690 | |
107bad8b SR |
2691 | mutex_lock(&trace_types_lock); |
2692 | ||
b3806b43 SR |
2693 | iter->tr->waiter = NULL; |
2694 | ||
107bad8b | 2695 | if (signal_pending(current)) { |
6c6c2796 | 2696 | sret = -EINTR; |
107bad8b SR |
2697 | goto out; |
2698 | } | |
b3806b43 | 2699 | |
84527997 | 2700 | if (iter->trace != current_trace) |
107bad8b | 2701 | goto out; |
84527997 | 2702 | |
b3806b43 SR |
2703 | /* |
2704 | * We block until we read something and tracing is disabled. | |
2705 | * We still block if tracing is disabled, but we have never | |
2706 | * read anything. This allows a user to cat this file, and | |
2707 | * then enable tracing. But after we have read something, | |
2708 | * we give an EOF when tracing is again disabled. | |
2709 | * | |
2710 | * iter->pos will be 0 if we haven't read anything. | |
2711 | */ | |
2712 | if (!tracer_enabled && iter->pos) | |
2713 | break; | |
2714 | ||
2715 | continue; | |
2716 | } | |
2717 | ||
2718 | /* stop when tracing is finished */ | |
2719 | if (trace_empty(iter)) | |
107bad8b | 2720 | goto out; |
b3806b43 SR |
2721 | |
2722 | if (cnt >= PAGE_SIZE) | |
2723 | cnt = PAGE_SIZE - 1; | |
2724 | ||
53d0aa77 | 2725 | /* reset all but tr, trace, and overruns */ |
53d0aa77 SR |
2726 | memset(&iter->seq, 0, |
2727 | sizeof(struct trace_iterator) - | |
2728 | offsetof(struct trace_iterator, seq)); | |
4823ed7e | 2729 | iter->pos = -1; |
b3806b43 SR |
2730 | |
2731 | /* | |
2732 | * We need to stop all tracing on all CPUS to read the | |
2733 | * the next buffer. This is a bit expensive, but is | |
2734 | * not done often. We fill all what we can read, | |
2735 | * and then release the locks again. | |
2736 | */ | |
2737 | ||
2738 | cpus_clear(mask); | |
2739 | local_irq_save(flags); | |
25770467 | 2740 | #ifdef CONFIG_FTRACE |
2e0f5761 IM |
2741 | ftrace_save = ftrace_enabled; |
2742 | ftrace_enabled = 0; | |
25770467 | 2743 | #endif |
2e0f5761 | 2744 | smp_wmb(); |
ab46428c | 2745 | for_each_tracing_cpu(cpu) { |
b3806b43 SR |
2746 | data = iter->tr->data[cpu]; |
2747 | ||
2748 | if (!head_page(data) || !data->trace_idx) | |
2749 | continue; | |
2750 | ||
2751 | atomic_inc(&data->disabled); | |
b3806b43 SR |
2752 | cpu_set(cpu, mask); |
2753 | } | |
2754 | ||
2e0f5761 IM |
2755 | for_each_cpu_mask(cpu, mask) { |
2756 | data = iter->tr->data[cpu]; | |
92205c23 | 2757 | __raw_spin_lock(&data->lock); |
53d0aa77 SR |
2758 | |
2759 | if (data->overrun > iter->last_overrun[cpu]) | |
2760 | iter->overrun[cpu] += | |
2761 | data->overrun - iter->last_overrun[cpu]; | |
2762 | iter->last_overrun[cpu] = data->overrun; | |
2e0f5761 IM |
2763 | } |
2764 | ||
088b1e42 | 2765 | while (find_next_entry_inc(iter) != NULL) { |
6c6c2796 | 2766 | int ret; |
088b1e42 SR |
2767 | int len = iter->seq.len; |
2768 | ||
f9896bf3 | 2769 | ret = print_trace_line(iter); |
088b1e42 SR |
2770 | if (!ret) { |
2771 | /* don't print partial lines */ | |
2772 | iter->seq.len = len; | |
b3806b43 | 2773 | break; |
088b1e42 | 2774 | } |
b3806b43 SR |
2775 | |
2776 | trace_consume(iter); | |
2777 | ||
2778 | if (iter->seq.len >= cnt) | |
2779 | break; | |
b3806b43 SR |
2780 | } |
2781 | ||
d4c5a2f5 | 2782 | for_each_cpu_mask(cpu, mask) { |
b3806b43 | 2783 | data = iter->tr->data[cpu]; |
92205c23 | 2784 | __raw_spin_unlock(&data->lock); |
2e0f5761 IM |
2785 | } |
2786 | ||
2787 | for_each_cpu_mask(cpu, mask) { | |
2788 | data = iter->tr->data[cpu]; | |
b3806b43 SR |
2789 | atomic_dec(&data->disabled); |
2790 | } | |
25770467 | 2791 | #ifdef CONFIG_FTRACE |
2e0f5761 | 2792 | ftrace_enabled = ftrace_save; |
25770467 | 2793 | #endif |
b3806b43 SR |
2794 | local_irq_restore(flags); |
2795 | ||
2796 | /* Now copy what we have to the user */ | |
6c6c2796 PP |
2797 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
2798 | if (iter->seq.readpos >= iter->seq.len) | |
b3806b43 | 2799 | trace_seq_reset(&iter->seq); |
6c6c2796 PP |
2800 | if (sret == -EBUSY) |
2801 | sret = 0; | |
b3806b43 | 2802 | |
107bad8b SR |
2803 | out: |
2804 | mutex_unlock(&trace_types_lock); | |
2805 | ||
6c6c2796 | 2806 | return sret; |
b3806b43 SR |
2807 | } |
2808 | ||
a98a3c3f SR |
2809 | static ssize_t |
2810 | tracing_entries_read(struct file *filp, char __user *ubuf, | |
2811 | size_t cnt, loff_t *ppos) | |
2812 | { | |
2813 | struct trace_array *tr = filp->private_data; | |
2814 | char buf[64]; | |
2815 | int r; | |
2816 | ||
2817 | r = sprintf(buf, "%lu\n", tr->entries); | |
2818 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
2819 | } | |
2820 | ||
2821 | static ssize_t | |
2822 | tracing_entries_write(struct file *filp, const char __user *ubuf, | |
2823 | size_t cnt, loff_t *ppos) | |
2824 | { | |
2825 | unsigned long val; | |
2826 | char buf[64]; | |
19384c03 | 2827 | int i, ret; |
a98a3c3f | 2828 | |
cffae437 SR |
2829 | if (cnt >= sizeof(buf)) |
2830 | return -EINVAL; | |
a98a3c3f SR |
2831 | |
2832 | if (copy_from_user(&buf, ubuf, cnt)) | |
2833 | return -EFAULT; | |
2834 | ||
2835 | buf[cnt] = 0; | |
2836 | ||
c6caeeb1 SR |
2837 | ret = strict_strtoul(buf, 10, &val); |
2838 | if (ret < 0) | |
2839 | return ret; | |
a98a3c3f SR |
2840 | |
2841 | /* must have at least 1 entry */ | |
2842 | if (!val) | |
2843 | return -EINVAL; | |
2844 | ||
2845 | mutex_lock(&trace_types_lock); | |
2846 | ||
2847 | if (current_trace != &no_tracer) { | |
2848 | cnt = -EBUSY; | |
2849 | pr_info("ftrace: set current_tracer to none" | |
2850 | " before modifying buffer size\n"); | |
2851 | goto out; | |
2852 | } | |
2853 | ||
2854 | if (val > global_trace.entries) { | |
3eefae99 SR |
2855 | long pages_requested; |
2856 | unsigned long freeable_pages; | |
2857 | ||
2858 | /* make sure we have enough memory before mapping */ | |
2859 | pages_requested = | |
2860 | (val + (ENTRIES_PER_PAGE-1)) / ENTRIES_PER_PAGE; | |
2861 | ||
2862 | /* account for each buffer (and max_tr) */ | |
2863 | pages_requested *= tracing_nr_buffers * 2; | |
2864 | ||
2865 | /* Check for overflow */ | |
2866 | if (pages_requested < 0) { | |
2867 | cnt = -ENOMEM; | |
2868 | goto out; | |
2869 | } | |
2870 | ||
2871 | freeable_pages = determine_dirtyable_memory(); | |
2872 | ||
2873 | /* we only allow to request 1/4 of useable memory */ | |
2874 | if (pages_requested > | |
2875 | ((freeable_pages + tracing_pages_allocated) / 4)) { | |
2876 | cnt = -ENOMEM; | |
2877 | goto out; | |
2878 | } | |
2879 | ||
a98a3c3f SR |
2880 | while (global_trace.entries < val) { |
2881 | if (trace_alloc_page()) { | |
2882 | cnt = -ENOMEM; | |
2883 | goto out; | |
2884 | } | |
3eefae99 SR |
2885 | /* double check that we don't go over the known pages */ |
2886 | if (tracing_pages_allocated > pages_requested) | |
2887 | break; | |
a98a3c3f | 2888 | } |
3eefae99 | 2889 | |
a98a3c3f SR |
2890 | } else { |
2891 | /* include the number of entries in val (inc of page entries) */ | |
2892 | while (global_trace.entries > val + (ENTRIES_PER_PAGE - 1)) | |
2893 | trace_free_page(); | |
2894 | } | |
2895 | ||
19384c03 SR |
2896 | /* check integrity */ |
2897 | for_each_tracing_cpu(i) | |
2898 | check_pages(global_trace.data[i]); | |
2899 | ||
a98a3c3f SR |
2900 | filp->f_pos += cnt; |
2901 | ||
19384c03 SR |
2902 | /* If check pages failed, return ENOMEM */ |
2903 | if (tracing_disabled) | |
2904 | cnt = -ENOMEM; | |
a98a3c3f SR |
2905 | out: |
2906 | max_tr.entries = global_trace.entries; | |
2907 | mutex_unlock(&trace_types_lock); | |
2908 | ||
2909 | return cnt; | |
2910 | } | |
2911 | ||
bc0c38d1 | 2912 | static struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
2913 | .open = tracing_open_generic, |
2914 | .read = tracing_max_lat_read, | |
2915 | .write = tracing_max_lat_write, | |
bc0c38d1 SR |
2916 | }; |
2917 | ||
2918 | static struct file_operations tracing_ctrl_fops = { | |
4bf39a94 IM |
2919 | .open = tracing_open_generic, |
2920 | .read = tracing_ctrl_read, | |
2921 | .write = tracing_ctrl_write, | |
bc0c38d1 SR |
2922 | }; |
2923 | ||
2924 | static struct file_operations set_tracer_fops = { | |
4bf39a94 IM |
2925 | .open = tracing_open_generic, |
2926 | .read = tracing_set_trace_read, | |
2927 | .write = tracing_set_trace_write, | |
bc0c38d1 SR |
2928 | }; |
2929 | ||
b3806b43 | 2930 | static struct file_operations tracing_pipe_fops = { |
4bf39a94 | 2931 | .open = tracing_open_pipe, |
2a2cc8f7 | 2932 | .poll = tracing_poll_pipe, |
4bf39a94 IM |
2933 | .read = tracing_read_pipe, |
2934 | .release = tracing_release_pipe, | |
b3806b43 SR |
2935 | }; |
2936 | ||
a98a3c3f SR |
2937 | static struct file_operations tracing_entries_fops = { |
2938 | .open = tracing_open_generic, | |
2939 | .read = tracing_entries_read, | |
2940 | .write = tracing_entries_write, | |
2941 | }; | |
2942 | ||
bc0c38d1 SR |
2943 | #ifdef CONFIG_DYNAMIC_FTRACE |
2944 | ||
2945 | static ssize_t | |
2946 | tracing_read_long(struct file *filp, char __user *ubuf, | |
2947 | size_t cnt, loff_t *ppos) | |
2948 | { | |
2949 | unsigned long *p = filp->private_data; | |
2950 | char buf[64]; | |
2951 | int r; | |
2952 | ||
2953 | r = sprintf(buf, "%ld\n", *p); | |
4bf39a94 IM |
2954 | |
2955 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
bc0c38d1 SR |
2956 | } |
2957 | ||
2958 | static struct file_operations tracing_read_long_fops = { | |
4bf39a94 IM |
2959 | .open = tracing_open_generic, |
2960 | .read = tracing_read_long, | |
bc0c38d1 SR |
2961 | }; |
2962 | #endif | |
2963 | ||
2964 | static struct dentry *d_tracer; | |
2965 | ||
2966 | struct dentry *tracing_init_dentry(void) | |
2967 | { | |
2968 | static int once; | |
2969 | ||
2970 | if (d_tracer) | |
2971 | return d_tracer; | |
2972 | ||
2973 | d_tracer = debugfs_create_dir("tracing", NULL); | |
2974 | ||
2975 | if (!d_tracer && !once) { | |
2976 | once = 1; | |
2977 | pr_warning("Could not create debugfs directory 'tracing'\n"); | |
2978 | return NULL; | |
2979 | } | |
2980 | ||
2981 | return d_tracer; | |
2982 | } | |
2983 | ||
60a11774 SR |
2984 | #ifdef CONFIG_FTRACE_SELFTEST |
2985 | /* Let selftest have access to static functions in this file */ | |
2986 | #include "trace_selftest.c" | |
2987 | #endif | |
2988 | ||
bc0c38d1 SR |
2989 | static __init void tracer_init_debugfs(void) |
2990 | { | |
2991 | struct dentry *d_tracer; | |
2992 | struct dentry *entry; | |
2993 | ||
2994 | d_tracer = tracing_init_dentry(); | |
2995 | ||
2996 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, | |
2997 | &global_trace, &tracing_ctrl_fops); | |
2998 | if (!entry) | |
2999 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); | |
3000 | ||
3001 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, | |
3002 | NULL, &tracing_iter_fops); | |
3003 | if (!entry) | |
3004 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); | |
3005 | ||
c7078de1 IM |
3006 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
3007 | NULL, &tracing_cpumask_fops); | |
3008 | if (!entry) | |
3009 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); | |
3010 | ||
bc0c38d1 SR |
3011 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
3012 | &global_trace, &tracing_lt_fops); | |
3013 | if (!entry) | |
3014 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); | |
3015 | ||
3016 | entry = debugfs_create_file("trace", 0444, d_tracer, | |
3017 | &global_trace, &tracing_fops); | |
3018 | if (!entry) | |
3019 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
3020 | ||
3021 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, | |
3022 | &global_trace, &show_traces_fops); | |
3023 | if (!entry) | |
3024 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
3025 | ||
3026 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, | |
3027 | &global_trace, &set_tracer_fops); | |
3028 | if (!entry) | |
3029 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
3030 | ||
3031 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, | |
3032 | &tracing_max_latency, | |
3033 | &tracing_max_lat_fops); | |
3034 | if (!entry) | |
3035 | pr_warning("Could not create debugfs " | |
3036 | "'tracing_max_latency' entry\n"); | |
3037 | ||
3038 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, | |
3039 | &tracing_thresh, &tracing_max_lat_fops); | |
3040 | if (!entry) | |
3041 | pr_warning("Could not create debugfs " | |
3042 | "'tracing_threash' entry\n"); | |
7bd2f24c IM |
3043 | entry = debugfs_create_file("README", 0644, d_tracer, |
3044 | NULL, &tracing_readme_fops); | |
3045 | if (!entry) | |
3046 | pr_warning("Could not create debugfs 'README' entry\n"); | |
3047 | ||
b3806b43 SR |
3048 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
3049 | NULL, &tracing_pipe_fops); | |
3050 | if (!entry) | |
3051 | pr_warning("Could not create debugfs " | |
3052 | "'tracing_threash' entry\n"); | |
bc0c38d1 | 3053 | |
a98a3c3f SR |
3054 | entry = debugfs_create_file("trace_entries", 0644, d_tracer, |
3055 | &global_trace, &tracing_entries_fops); | |
3056 | if (!entry) | |
3057 | pr_warning("Could not create debugfs " | |
3058 | "'tracing_threash' entry\n"); | |
3059 | ||
bc0c38d1 SR |
3060 | #ifdef CONFIG_DYNAMIC_FTRACE |
3061 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, | |
3062 | &ftrace_update_tot_cnt, | |
3063 | &tracing_read_long_fops); | |
3064 | if (!entry) | |
3065 | pr_warning("Could not create debugfs " | |
3066 | "'dyn_ftrace_total_info' entry\n"); | |
3067 | #endif | |
d618b3e6 IM |
3068 | #ifdef CONFIG_SYSPROF_TRACER |
3069 | init_tracer_sysprof_debugfs(d_tracer); | |
3070 | #endif | |
bc0c38d1 SR |
3071 | } |
3072 | ||
dd0e545f SR |
3073 | #define TRACE_BUF_SIZE 1024 |
3074 | #define TRACE_PRINT_BUF_SIZE \ | |
3075 | (sizeof(struct trace_field) - offsetof(struct trace_field, print.buf)) | |
3076 | #define TRACE_CONT_BUF_SIZE sizeof(struct trace_field) | |
3077 | ||
3078 | /** | |
3079 | * ftrace_printk - printf formatting in the ftrace buffer | |
3080 | * @fmt - the printf format for printing. | |
3081 | * | |
3082 | * Note: __ftrace_printk is an internal function for ftrace_printk and | |
3083 | * the @ip is passed in via the ftrace_printk macro. | |
3084 | * | |
3085 | * This function allows a kernel developer to debug fast path sections | |
3086 | * that printk is not appropriate for. By scattering in various | |
3087 | * printk like tracing in the code, a developer can quickly see | |
3088 | * where problems are occurring. | |
3089 | * | |
3090 | * This is intended as a debugging tool for the developer only. | |
3091 | * Please reframe from leaving ftrace_printks scattered around in | |
3092 | * your code. | |
3093 | */ | |
3094 | int __ftrace_printk(unsigned long ip, const char *fmt, ...) | |
3095 | { | |
3096 | struct trace_array *tr = &global_trace; | |
3097 | static DEFINE_SPINLOCK(trace_buf_lock); | |
3098 | static char trace_buf[TRACE_BUF_SIZE]; | |
3099 | struct trace_array_cpu *data; | |
3100 | struct trace_entry *entry; | |
3101 | unsigned long flags; | |
3102 | long disabled; | |
3103 | va_list ap; | |
3104 | int cpu, len = 0, write, written = 0; | |
3105 | ||
3106 | if (likely(!ftrace_function_enabled)) | |
3107 | return 0; | |
3108 | ||
3109 | local_irq_save(flags); | |
3110 | cpu = raw_smp_processor_id(); | |
3111 | data = tr->data[cpu]; | |
3112 | disabled = atomic_inc_return(&data->disabled); | |
3113 | ||
3114 | if (unlikely(disabled != 1 || !ftrace_function_enabled)) | |
3115 | goto out; | |
3116 | ||
3117 | spin_lock(&trace_buf_lock); | |
3118 | va_start(ap, fmt); | |
3119 | len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, ap); | |
3120 | va_end(ap); | |
3121 | ||
3122 | len = min(len, TRACE_BUF_SIZE-1); | |
3123 | trace_buf[len] = 0; | |
3124 | ||
3125 | __raw_spin_lock(&data->lock); | |
3126 | entry = tracing_get_trace_entry(tr, data); | |
3127 | tracing_generic_entry_update(entry, flags); | |
3128 | entry->type = TRACE_PRINT; | |
3129 | entry->field.print.ip = ip; | |
3130 | ||
3131 | write = min(len, (int)(TRACE_PRINT_BUF_SIZE-1)); | |
3132 | ||
3133 | memcpy(&entry->field.print.buf, trace_buf, write); | |
3134 | entry->field.print.buf[write] = 0; | |
3135 | written = write; | |
3136 | ||
3137 | if (written != len) | |
3138 | entry->field.flags |= TRACE_FLAG_CONT; | |
3139 | ||
3140 | while (written != len) { | |
3141 | entry = tracing_get_trace_entry(tr, data); | |
3142 | ||
3143 | entry->type = TRACE_CONT; | |
3144 | write = min(len - written, (int)(TRACE_CONT_BUF_SIZE-1)); | |
3145 | memcpy(&entry->cont.buf, trace_buf+written, write); | |
3146 | entry->cont.buf[write] = 0; | |
3147 | written += write; | |
3148 | } | |
3149 | __raw_spin_unlock(&data->lock); | |
3150 | ||
3151 | spin_unlock(&trace_buf_lock); | |
3152 | ||
3153 | out: | |
3154 | atomic_dec(&data->disabled); | |
3155 | local_irq_restore(flags); | |
3156 | ||
3157 | return len; | |
3158 | } | |
3159 | EXPORT_SYMBOL_GPL(__ftrace_printk); | |
3160 | ||
4c11d7ae | 3161 | static int trace_alloc_page(void) |
bc0c38d1 | 3162 | { |
4c11d7ae | 3163 | struct trace_array_cpu *data; |
4c11d7ae SR |
3164 | struct page *page, *tmp; |
3165 | LIST_HEAD(pages); | |
c7aafc54 | 3166 | void *array; |
3eefae99 | 3167 | unsigned pages_allocated = 0; |
4c11d7ae SR |
3168 | int i; |
3169 | ||
3170 | /* first allocate a page for each CPU */ | |
ab46428c | 3171 | for_each_tracing_cpu(i) { |
4c11d7ae SR |
3172 | array = (void *)__get_free_page(GFP_KERNEL); |
3173 | if (array == NULL) { | |
3174 | printk(KERN_ERR "tracer: failed to allocate page" | |
3175 | "for trace buffer!\n"); | |
3176 | goto free_pages; | |
3177 | } | |
3178 | ||
3eefae99 | 3179 | pages_allocated++; |
4c11d7ae SR |
3180 | page = virt_to_page(array); |
3181 | list_add(&page->lru, &pages); | |
3182 | ||
3183 | /* Only allocate if we are actually using the max trace */ | |
3184 | #ifdef CONFIG_TRACER_MAX_TRACE | |
3185 | array = (void *)__get_free_page(GFP_KERNEL); | |
3186 | if (array == NULL) { | |
3187 | printk(KERN_ERR "tracer: failed to allocate page" | |
3188 | "for trace buffer!\n"); | |
3189 | goto free_pages; | |
3190 | } | |
3eefae99 | 3191 | pages_allocated++; |
4c11d7ae SR |
3192 | page = virt_to_page(array); |
3193 | list_add(&page->lru, &pages); | |
3194 | #endif | |
3195 | } | |
3196 | ||
3197 | /* Now that we successfully allocate a page per CPU, add them */ | |
ab46428c | 3198 | for_each_tracing_cpu(i) { |
4c11d7ae SR |
3199 | data = global_trace.data[i]; |
3200 | page = list_entry(pages.next, struct page, lru); | |
c7aafc54 | 3201 | list_del_init(&page->lru); |
4c11d7ae SR |
3202 | list_add_tail(&page->lru, &data->trace_pages); |
3203 | ClearPageLRU(page); | |
3204 | ||
3205 | #ifdef CONFIG_TRACER_MAX_TRACE | |
3206 | data = max_tr.data[i]; | |
3207 | page = list_entry(pages.next, struct page, lru); | |
c7aafc54 | 3208 | list_del_init(&page->lru); |
4c11d7ae SR |
3209 | list_add_tail(&page->lru, &data->trace_pages); |
3210 | SetPageLRU(page); | |
3211 | #endif | |
3212 | } | |
3eefae99 | 3213 | tracing_pages_allocated += pages_allocated; |
4c11d7ae SR |
3214 | global_trace.entries += ENTRIES_PER_PAGE; |
3215 | ||
3216 | return 0; | |
3217 | ||
3218 | free_pages: | |
3219 | list_for_each_entry_safe(page, tmp, &pages, lru) { | |
c7aafc54 | 3220 | list_del_init(&page->lru); |
4c11d7ae SR |
3221 | __free_page(page); |
3222 | } | |
3223 | return -ENOMEM; | |
bc0c38d1 SR |
3224 | } |
3225 | ||
a98a3c3f SR |
3226 | static int trace_free_page(void) |
3227 | { | |
3228 | struct trace_array_cpu *data; | |
3229 | struct page *page; | |
3230 | struct list_head *p; | |
3231 | int i; | |
3232 | int ret = 0; | |
3233 | ||
3234 | /* free one page from each buffer */ | |
ab46428c | 3235 | for_each_tracing_cpu(i) { |
a98a3c3f SR |
3236 | data = global_trace.data[i]; |
3237 | p = data->trace_pages.next; | |
3238 | if (p == &data->trace_pages) { | |
3239 | /* should never happen */ | |
3240 | WARN_ON(1); | |
3241 | tracing_disabled = 1; | |
3242 | ret = -1; | |
3243 | break; | |
3244 | } | |
3245 | page = list_entry(p, struct page, lru); | |
3246 | ClearPageLRU(page); | |
3247 | list_del(&page->lru); | |
3eefae99 SR |
3248 | tracing_pages_allocated--; |
3249 | tracing_pages_allocated--; | |
a98a3c3f SR |
3250 | __free_page(page); |
3251 | ||
3252 | tracing_reset(data); | |
3253 | ||
3254 | #ifdef CONFIG_TRACER_MAX_TRACE | |
3255 | data = max_tr.data[i]; | |
3256 | p = data->trace_pages.next; | |
3257 | if (p == &data->trace_pages) { | |
3258 | /* should never happen */ | |
3259 | WARN_ON(1); | |
3260 | tracing_disabled = 1; | |
3261 | ret = -1; | |
3262 | break; | |
3263 | } | |
3264 | page = list_entry(p, struct page, lru); | |
3265 | ClearPageLRU(page); | |
3266 | list_del(&page->lru); | |
3267 | __free_page(page); | |
3268 | ||
3269 | tracing_reset(data); | |
3270 | #endif | |
3271 | } | |
3272 | global_trace.entries -= ENTRIES_PER_PAGE; | |
3273 | ||
3274 | return ret; | |
3275 | } | |
3276 | ||
bc0c38d1 SR |
3277 | __init static int tracer_alloc_buffers(void) |
3278 | { | |
4c11d7ae SR |
3279 | struct trace_array_cpu *data; |
3280 | void *array; | |
3281 | struct page *page; | |
3282 | int pages = 0; | |
60a11774 | 3283 | int ret = -ENOMEM; |
bc0c38d1 SR |
3284 | int i; |
3285 | ||
ab46428c SR |
3286 | /* TODO: make the number of buffers hot pluggable with CPUS */ |
3287 | tracing_nr_buffers = num_possible_cpus(); | |
3288 | tracing_buffer_mask = cpu_possible_map; | |
3289 | ||
4c11d7ae | 3290 | /* Allocate the first page for all buffers */ |
ab46428c | 3291 | for_each_tracing_cpu(i) { |
4c11d7ae | 3292 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
bc0c38d1 SR |
3293 | max_tr.data[i] = &per_cpu(max_data, i); |
3294 | ||
4c11d7ae | 3295 | array = (void *)__get_free_page(GFP_KERNEL); |
bc0c38d1 | 3296 | if (array == NULL) { |
4c11d7ae SR |
3297 | printk(KERN_ERR "tracer: failed to allocate page" |
3298 | "for trace buffer!\n"); | |
bc0c38d1 SR |
3299 | goto free_buffers; |
3300 | } | |
4c11d7ae SR |
3301 | |
3302 | /* set the array to the list */ | |
3303 | INIT_LIST_HEAD(&data->trace_pages); | |
3304 | page = virt_to_page(array); | |
3305 | list_add(&page->lru, &data->trace_pages); | |
3306 | /* use the LRU flag to differentiate the two buffers */ | |
3307 | ClearPageLRU(page); | |
bc0c38d1 | 3308 | |
a98a3c3f SR |
3309 | data->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
3310 | max_tr.data[i]->lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; | |
3311 | ||
bc0c38d1 SR |
3312 | /* Only allocate if we are actually using the max trace */ |
3313 | #ifdef CONFIG_TRACER_MAX_TRACE | |
4c11d7ae | 3314 | array = (void *)__get_free_page(GFP_KERNEL); |
bc0c38d1 | 3315 | if (array == NULL) { |
4c11d7ae SR |
3316 | printk(KERN_ERR "tracer: failed to allocate page" |
3317 | "for trace buffer!\n"); | |
bc0c38d1 SR |
3318 | goto free_buffers; |
3319 | } | |
4c11d7ae SR |
3320 | |
3321 | INIT_LIST_HEAD(&max_tr.data[i]->trace_pages); | |
3322 | page = virt_to_page(array); | |
3323 | list_add(&page->lru, &max_tr.data[i]->trace_pages); | |
3324 | SetPageLRU(page); | |
bc0c38d1 SR |
3325 | #endif |
3326 | } | |
3327 | ||
3328 | /* | |
3329 | * Since we allocate by orders of pages, we may be able to | |
3330 | * round up a bit. | |
3331 | */ | |
4c11d7ae | 3332 | global_trace.entries = ENTRIES_PER_PAGE; |
4c11d7ae SR |
3333 | pages++; |
3334 | ||
3335 | while (global_trace.entries < trace_nr_entries) { | |
3336 | if (trace_alloc_page()) | |
3337 | break; | |
3338 | pages++; | |
3339 | } | |
89b2f978 | 3340 | max_tr.entries = global_trace.entries; |
bc0c38d1 | 3341 | |
20764ff1 JS |
3342 | pr_info("tracer: %d pages allocated for %ld entries of %ld bytes\n", |
3343 | pages, trace_nr_entries, (long)TRACE_ENTRY_SIZE); | |
bc0c38d1 SR |
3344 | pr_info(" actual entries %ld\n", global_trace.entries); |
3345 | ||
3346 | tracer_init_debugfs(); | |
3347 | ||
3348 | trace_init_cmdlines(); | |
3349 | ||
3350 | register_tracer(&no_tracer); | |
3351 | current_trace = &no_tracer; | |
3352 | ||
60a11774 | 3353 | /* All seems OK, enable tracing */ |
4902f884 | 3354 | global_trace.ctrl = tracer_enabled; |
60a11774 SR |
3355 | tracing_disabled = 0; |
3356 | ||
bc0c38d1 SR |
3357 | return 0; |
3358 | ||
3359 | free_buffers: | |
3360 | for (i-- ; i >= 0; i--) { | |
4c11d7ae | 3361 | struct page *page, *tmp; |
bc0c38d1 SR |
3362 | struct trace_array_cpu *data = global_trace.data[i]; |
3363 | ||
c7aafc54 | 3364 | if (data) { |
4c11d7ae SR |
3365 | list_for_each_entry_safe(page, tmp, |
3366 | &data->trace_pages, lru) { | |
c7aafc54 | 3367 | list_del_init(&page->lru); |
4c11d7ae SR |
3368 | __free_page(page); |
3369 | } | |
bc0c38d1 SR |
3370 | } |
3371 | ||
3372 | #ifdef CONFIG_TRACER_MAX_TRACE | |
3373 | data = max_tr.data[i]; | |
c7aafc54 | 3374 | if (data) { |
4c11d7ae SR |
3375 | list_for_each_entry_safe(page, tmp, |
3376 | &data->trace_pages, lru) { | |
c7aafc54 | 3377 | list_del_init(&page->lru); |
4c11d7ae SR |
3378 | __free_page(page); |
3379 | } | |
bc0c38d1 SR |
3380 | } |
3381 | #endif | |
3382 | } | |
60a11774 | 3383 | return ret; |
bc0c38d1 | 3384 | } |
60a11774 | 3385 | fs_initcall(tracer_alloc_buffers); |