]>
Commit | Line | Data |
---|---|---|
bc0c38d1 SR |
1 | /* |
2 | * ring buffer based function tracer | |
3 | * | |
4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> | |
5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> | |
6 | * | |
7 | * Originally taken from the RT patch by: | |
8 | * Arnaldo Carvalho de Melo <acme@redhat.com> | |
9 | * | |
10 | * Based on code from the latency_tracer, that is: | |
11 | * Copyright (C) 2004-2006 Ingo Molnar | |
12 | * Copyright (C) 2004 William Lee Irwin III | |
13 | */ | |
14 | #include <linux/utsrelease.h> | |
15 | #include <linux/kallsyms.h> | |
16 | #include <linux/seq_file.h> | |
3f5a54e3 | 17 | #include <linux/notifier.h> |
bc0c38d1 | 18 | #include <linux/debugfs.h> |
4c11d7ae | 19 | #include <linux/pagemap.h> |
bc0c38d1 SR |
20 | #include <linux/hardirq.h> |
21 | #include <linux/linkage.h> | |
22 | #include <linux/uaccess.h> | |
23 | #include <linux/ftrace.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/percpu.h> | |
3f5a54e3 | 26 | #include <linux/kdebug.h> |
bc0c38d1 SR |
27 | #include <linux/ctype.h> |
28 | #include <linux/init.h> | |
2a2cc8f7 | 29 | #include <linux/poll.h> |
bc0c38d1 SR |
30 | #include <linux/gfp.h> |
31 | #include <linux/fs.h> | |
76094a2c | 32 | #include <linux/kprobes.h> |
3eefae99 | 33 | #include <linux/writeback.h> |
bc0c38d1 | 34 | |
86387f7e | 35 | #include <linux/stacktrace.h> |
3928a8a2 | 36 | #include <linux/ring_buffer.h> |
21798a84 | 37 | #include <linux/irqflags.h> |
86387f7e | 38 | |
bc0c38d1 SR |
39 | #include "trace.h" |
40 | ||
3928a8a2 SR |
41 | #define TRACE_BUFFER_FLAGS (RB_FL_OVERWRITE) |
42 | ||
bc0c38d1 SR |
43 | unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX; |
44 | unsigned long __read_mostly tracing_thresh; | |
45 | ||
0f048701 SR |
46 | |
47 | /* | |
48 | * Kill all tracing for good (never come back). | |
49 | * It is initialized to 1 but will turn to zero if the initialization | |
50 | * of the tracer is successful. But that is the only place that sets | |
51 | * this back to zero. | |
52 | */ | |
53 | int tracing_disabled = 1; | |
54 | ||
d769041f SR |
55 | static DEFINE_PER_CPU(local_t, ftrace_cpu_disabled); |
56 | ||
57 | static inline void ftrace_disable_cpu(void) | |
58 | { | |
59 | preempt_disable(); | |
60 | local_inc(&__get_cpu_var(ftrace_cpu_disabled)); | |
61 | } | |
62 | ||
63 | static inline void ftrace_enable_cpu(void) | |
64 | { | |
65 | local_dec(&__get_cpu_var(ftrace_cpu_disabled)); | |
66 | preempt_enable(); | |
67 | } | |
68 | ||
ab46428c SR |
69 | static cpumask_t __read_mostly tracing_buffer_mask; |
70 | ||
71 | #define for_each_tracing_cpu(cpu) \ | |
72 | for_each_cpu_mask(cpu, tracing_buffer_mask) | |
73 | ||
944ac425 SR |
74 | /* |
75 | * ftrace_dump_on_oops - variable to dump ftrace buffer on oops | |
76 | * | |
77 | * If there is an oops (or kernel panic) and the ftrace_dump_on_oops | |
78 | * is set, then ftrace_dump is called. This will output the contents | |
79 | * of the ftrace buffers to the console. This is very useful for | |
80 | * capturing traces that lead to crashes and outputing it to a | |
81 | * serial console. | |
82 | * | |
83 | * It is default off, but you can enable it with either specifying | |
84 | * "ftrace_dump_on_oops" in the kernel command line, or setting | |
85 | * /proc/sys/kernel/ftrace_dump_on_oops to true. | |
86 | */ | |
87 | int ftrace_dump_on_oops; | |
88 | ||
d9e54076 PZ |
89 | static int tracing_set_tracer(char *buf); |
90 | ||
91 | static int __init set_ftrace(char *str) | |
92 | { | |
93 | tracing_set_tracer(str); | |
94 | return 1; | |
95 | } | |
96 | __setup("ftrace", set_ftrace); | |
97 | ||
944ac425 SR |
98 | static int __init set_ftrace_dump_on_oops(char *str) |
99 | { | |
100 | ftrace_dump_on_oops = 1; | |
101 | return 1; | |
102 | } | |
103 | __setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops); | |
104 | ||
72829bc3 | 105 | long |
bc0c38d1 SR |
106 | ns2usecs(cycle_t nsec) |
107 | { | |
108 | nsec += 500; | |
109 | do_div(nsec, 1000); | |
110 | return nsec; | |
111 | } | |
112 | ||
e309b41d | 113 | cycle_t ftrace_now(int cpu) |
750ed1a4 | 114 | { |
3928a8a2 SR |
115 | u64 ts = ring_buffer_time_stamp(cpu); |
116 | ring_buffer_normalize_time_stamp(cpu, &ts); | |
117 | return ts; | |
750ed1a4 IM |
118 | } |
119 | ||
4fcdae83 SR |
120 | /* |
121 | * The global_trace is the descriptor that holds the tracing | |
122 | * buffers for the live tracing. For each CPU, it contains | |
123 | * a link list of pages that will store trace entries. The | |
124 | * page descriptor of the pages in the memory is used to hold | |
125 | * the link list by linking the lru item in the page descriptor | |
126 | * to each of the pages in the buffer per CPU. | |
127 | * | |
128 | * For each active CPU there is a data field that holds the | |
129 | * pages for the buffer for that CPU. Each CPU has the same number | |
130 | * of pages allocated for its buffer. | |
131 | */ | |
bc0c38d1 SR |
132 | static struct trace_array global_trace; |
133 | ||
134 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); | |
135 | ||
4fcdae83 SR |
136 | /* |
137 | * The max_tr is used to snapshot the global_trace when a maximum | |
138 | * latency is reached. Some tracers will use this to store a maximum | |
139 | * trace while it continues examining live traces. | |
140 | * | |
141 | * The buffers for the max_tr are set up the same as the global_trace. | |
142 | * When a snapshot is taken, the link list of the max_tr is swapped | |
143 | * with the link list of the global_trace and the buffers are reset for | |
144 | * the global_trace so the tracing can continue. | |
145 | */ | |
bc0c38d1 SR |
146 | static struct trace_array max_tr; |
147 | ||
148 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); | |
149 | ||
4fcdae83 | 150 | /* tracer_enabled is used to toggle activation of a tracer */ |
26994ead | 151 | static int tracer_enabled = 1; |
4fcdae83 | 152 | |
9036990d SR |
153 | /** |
154 | * tracing_is_enabled - return tracer_enabled status | |
155 | * | |
156 | * This function is used by other tracers to know the status | |
157 | * of the tracer_enabled flag. Tracers may use this function | |
158 | * to know if it should enable their features when starting | |
159 | * up. See irqsoff tracer for an example (start_irqsoff_tracer). | |
160 | */ | |
161 | int tracing_is_enabled(void) | |
162 | { | |
163 | return tracer_enabled; | |
164 | } | |
165 | ||
60bc0800 SR |
166 | /* function tracing enabled */ |
167 | int ftrace_function_enabled; | |
168 | ||
4fcdae83 | 169 | /* |
3928a8a2 SR |
170 | * trace_buf_size is the size in bytes that is allocated |
171 | * for a buffer. Note, the number of bytes is always rounded | |
172 | * to page size. | |
3f5a54e3 SR |
173 | * |
174 | * This number is purposely set to a low number of 16384. | |
175 | * If the dump on oops happens, it will be much appreciated | |
176 | * to not have to wait for all that output. Anyway this can be | |
177 | * boot time and run time configurable. | |
4fcdae83 | 178 | */ |
3928a8a2 | 179 | #define TRACE_BUF_SIZE_DEFAULT 1441792UL /* 16384 * 88 (sizeof(entry)) */ |
3f5a54e3 | 180 | |
3928a8a2 | 181 | static unsigned long trace_buf_size = TRACE_BUF_SIZE_DEFAULT; |
bc0c38d1 | 182 | |
4fcdae83 | 183 | /* trace_types holds a link list of available tracers. */ |
bc0c38d1 | 184 | static struct tracer *trace_types __read_mostly; |
4fcdae83 SR |
185 | |
186 | /* current_trace points to the tracer that is currently active */ | |
bc0c38d1 | 187 | static struct tracer *current_trace __read_mostly; |
4fcdae83 SR |
188 | |
189 | /* | |
190 | * max_tracer_type_len is used to simplify the allocating of | |
191 | * buffers to read userspace tracer names. We keep track of | |
192 | * the longest tracer name registered. | |
193 | */ | |
bc0c38d1 SR |
194 | static int max_tracer_type_len; |
195 | ||
4fcdae83 SR |
196 | /* |
197 | * trace_types_lock is used to protect the trace_types list. | |
198 | * This lock is also used to keep user access serialized. | |
199 | * Accesses from userspace will grab this lock while userspace | |
200 | * activities happen inside the kernel. | |
201 | */ | |
bc0c38d1 | 202 | static DEFINE_MUTEX(trace_types_lock); |
4fcdae83 SR |
203 | |
204 | /* trace_wait is a waitqueue for tasks blocked on trace_poll */ | |
4e655519 IM |
205 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
206 | ||
4fcdae83 | 207 | /* trace_flags holds iter_ctrl options */ |
49833fc2 | 208 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK; |
4e655519 | 209 | |
4fcdae83 SR |
210 | /** |
211 | * trace_wake_up - wake up tasks waiting for trace input | |
212 | * | |
213 | * Simply wakes up any task that is blocked on the trace_wait | |
214 | * queue. These is used with trace_poll for tasks polling the trace. | |
215 | */ | |
4e655519 IM |
216 | void trace_wake_up(void) |
217 | { | |
017730c1 IM |
218 | /* |
219 | * The runqueue_is_locked() can fail, but this is the best we | |
220 | * have for now: | |
221 | */ | |
222 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) | |
4e655519 IM |
223 | wake_up(&trace_wait); |
224 | } | |
bc0c38d1 | 225 | |
3928a8a2 | 226 | static int __init set_buf_size(char *str) |
bc0c38d1 | 227 | { |
3928a8a2 | 228 | unsigned long buf_size; |
c6caeeb1 SR |
229 | int ret; |
230 | ||
bc0c38d1 SR |
231 | if (!str) |
232 | return 0; | |
3928a8a2 | 233 | ret = strict_strtoul(str, 0, &buf_size); |
c6caeeb1 | 234 | /* nr_entries can not be zero */ |
3928a8a2 | 235 | if (ret < 0 || buf_size == 0) |
c6caeeb1 | 236 | return 0; |
3928a8a2 | 237 | trace_buf_size = buf_size; |
bc0c38d1 SR |
238 | return 1; |
239 | } | |
3928a8a2 | 240 | __setup("trace_buf_size=", set_buf_size); |
bc0c38d1 | 241 | |
57f50be1 SR |
242 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
243 | { | |
244 | return nsecs / 1000; | |
245 | } | |
246 | ||
4fcdae83 SR |
247 | /* |
248 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that | |
249 | * control the output of kernel symbols. | |
250 | */ | |
bc0c38d1 SR |
251 | #define TRACE_ITER_SYM_MASK \ |
252 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
253 | ||
4fcdae83 | 254 | /* These must match the bit postions in trace_iterator_flags */ |
bc0c38d1 SR |
255 | static const char *trace_options[] = { |
256 | "print-parent", | |
257 | "sym-offset", | |
258 | "sym-addr", | |
259 | "verbose", | |
f9896bf3 | 260 | "raw", |
5e3ca0ec | 261 | "hex", |
cb0f12aa | 262 | "bin", |
2a2cc8f7 | 263 | "block", |
86387f7e | 264 | "stacktrace", |
4ac3ba41 | 265 | "sched-tree", |
f09ce573 | 266 | "ftrace_printk", |
b2a866f9 | 267 | "ftrace_preempt", |
bc0c38d1 SR |
268 | NULL |
269 | }; | |
270 | ||
4fcdae83 SR |
271 | /* |
272 | * ftrace_max_lock is used to protect the swapping of buffers | |
273 | * when taking a max snapshot. The buffers themselves are | |
274 | * protected by per_cpu spinlocks. But the action of the swap | |
275 | * needs its own lock. | |
276 | * | |
277 | * This is defined as a raw_spinlock_t in order to help | |
278 | * with performance when lockdep debugging is enabled. | |
279 | */ | |
92205c23 SR |
280 | static raw_spinlock_t ftrace_max_lock = |
281 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; | |
bc0c38d1 SR |
282 | |
283 | /* | |
284 | * Copy the new maximum trace into the separate maximum-trace | |
285 | * structure. (this way the maximum trace is permanently saved, | |
286 | * for later retrieval via /debugfs/tracing/latency_trace) | |
287 | */ | |
e309b41d | 288 | static void |
bc0c38d1 SR |
289 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
290 | { | |
291 | struct trace_array_cpu *data = tr->data[cpu]; | |
292 | ||
293 | max_tr.cpu = cpu; | |
294 | max_tr.time_start = data->preempt_timestamp; | |
295 | ||
296 | data = max_tr.data[cpu]; | |
297 | data->saved_latency = tracing_max_latency; | |
298 | ||
299 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); | |
300 | data->pid = tsk->pid; | |
301 | data->uid = tsk->uid; | |
302 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; | |
303 | data->policy = tsk->policy; | |
304 | data->rt_priority = tsk->rt_priority; | |
305 | ||
306 | /* record this tasks comm */ | |
307 | tracing_record_cmdline(current); | |
308 | } | |
309 | ||
4fcdae83 SR |
310 | /** |
311 | * trace_seq_printf - sequence printing of trace information | |
312 | * @s: trace sequence descriptor | |
313 | * @fmt: printf format string | |
314 | * | |
315 | * The tracer may use either sequence operations or its own | |
316 | * copy to user routines. To simplify formating of a trace | |
317 | * trace_seq_printf is used to store strings into a special | |
318 | * buffer (@s). Then the output may be either used by | |
319 | * the sequencer or pulled into another buffer. | |
320 | */ | |
72829bc3 | 321 | int |
214023c3 SR |
322 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
323 | { | |
324 | int len = (PAGE_SIZE - 1) - s->len; | |
325 | va_list ap; | |
b3806b43 | 326 | int ret; |
214023c3 SR |
327 | |
328 | if (!len) | |
329 | return 0; | |
330 | ||
331 | va_start(ap, fmt); | |
b3806b43 | 332 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
214023c3 SR |
333 | va_end(ap); |
334 | ||
b3806b43 | 335 | /* If we can't write it all, don't bother writing anything */ |
72829bc3 | 336 | if (ret >= len) |
b3806b43 SR |
337 | return 0; |
338 | ||
339 | s->len += ret; | |
214023c3 SR |
340 | |
341 | return len; | |
342 | } | |
343 | ||
4fcdae83 SR |
344 | /** |
345 | * trace_seq_puts - trace sequence printing of simple string | |
346 | * @s: trace sequence descriptor | |
347 | * @str: simple string to record | |
348 | * | |
349 | * The tracer may use either the sequence operations or its own | |
350 | * copy to user routines. This function records a simple string | |
351 | * into a special buffer (@s) for later retrieval by a sequencer | |
352 | * or other mechanism. | |
353 | */ | |
e309b41d | 354 | static int |
214023c3 SR |
355 | trace_seq_puts(struct trace_seq *s, const char *str) |
356 | { | |
357 | int len = strlen(str); | |
358 | ||
359 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
b3806b43 | 360 | return 0; |
214023c3 SR |
361 | |
362 | memcpy(s->buffer + s->len, str, len); | |
363 | s->len += len; | |
364 | ||
365 | return len; | |
366 | } | |
367 | ||
e309b41d | 368 | static int |
214023c3 SR |
369 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
370 | { | |
371 | if (s->len >= (PAGE_SIZE - 1)) | |
372 | return 0; | |
373 | ||
374 | s->buffer[s->len++] = c; | |
375 | ||
376 | return 1; | |
377 | } | |
378 | ||
e309b41d | 379 | static int |
cb0f12aa IM |
380 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
381 | { | |
382 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
383 | return 0; | |
384 | ||
385 | memcpy(s->buffer + s->len, mem, len); | |
386 | s->len += len; | |
387 | ||
388 | return len; | |
389 | } | |
390 | ||
ad0a3b68 HH |
391 | #define MAX_MEMHEX_BYTES 8 |
392 | #define HEX_CHARS (MAX_MEMHEX_BYTES*2 + 1) | |
5e3ca0ec | 393 | |
e309b41d | 394 | static int |
5e3ca0ec IM |
395 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
396 | { | |
397 | unsigned char hex[HEX_CHARS]; | |
93dcc6ea | 398 | unsigned char *data = mem; |
5e3ca0ec IM |
399 | int i, j; |
400 | ||
5e3ca0ec IM |
401 | #ifdef __BIG_ENDIAN |
402 | for (i = 0, j = 0; i < len; i++) { | |
403 | #else | |
404 | for (i = len-1, j = 0; i >= 0; i--) { | |
405 | #endif | |
2fbc4749 HH |
406 | hex[j++] = hex_asc_hi(data[i]); |
407 | hex[j++] = hex_asc_lo(data[i]); | |
5e3ca0ec | 408 | } |
93dcc6ea | 409 | hex[j++] = ' '; |
5e3ca0ec IM |
410 | |
411 | return trace_seq_putmem(s, hex, j); | |
412 | } | |
413 | ||
e309b41d | 414 | static void |
214023c3 SR |
415 | trace_seq_reset(struct trace_seq *s) |
416 | { | |
417 | s->len = 0; | |
6c6c2796 PP |
418 | s->readpos = 0; |
419 | } | |
420 | ||
421 | ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) | |
422 | { | |
423 | int len; | |
424 | int ret; | |
425 | ||
426 | if (s->len <= s->readpos) | |
427 | return -EBUSY; | |
428 | ||
429 | len = s->len - s->readpos; | |
430 | if (cnt > len) | |
431 | cnt = len; | |
432 | ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); | |
433 | if (ret) | |
434 | return -EFAULT; | |
435 | ||
436 | s->readpos += len; | |
437 | return cnt; | |
214023c3 SR |
438 | } |
439 | ||
e309b41d | 440 | static void |
214023c3 SR |
441 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
442 | { | |
443 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; | |
444 | ||
445 | s->buffer[len] = 0; | |
446 | seq_puts(m, s->buffer); | |
447 | ||
448 | trace_seq_reset(s); | |
449 | } | |
450 | ||
4fcdae83 SR |
451 | /** |
452 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr | |
453 | * @tr: tracer | |
454 | * @tsk: the task with the latency | |
455 | * @cpu: The cpu that initiated the trace. | |
456 | * | |
457 | * Flip the buffers between the @tr and the max_tr and record information | |
458 | * about which task was the cause of this latency. | |
459 | */ | |
e309b41d | 460 | void |
bc0c38d1 SR |
461 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
462 | { | |
3928a8a2 | 463 | struct ring_buffer *buf = tr->buffer; |
bc0c38d1 | 464 | |
4c11d7ae | 465 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 466 | __raw_spin_lock(&ftrace_max_lock); |
3928a8a2 SR |
467 | |
468 | tr->buffer = max_tr.buffer; | |
469 | max_tr.buffer = buf; | |
470 | ||
d769041f | 471 | ftrace_disable_cpu(); |
3928a8a2 | 472 | ring_buffer_reset(tr->buffer); |
d769041f | 473 | ftrace_enable_cpu(); |
bc0c38d1 SR |
474 | |
475 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 476 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
477 | } |
478 | ||
479 | /** | |
480 | * update_max_tr_single - only copy one trace over, and reset the rest | |
481 | * @tr - tracer | |
482 | * @tsk - task with the latency | |
483 | * @cpu - the cpu of the buffer to copy. | |
4fcdae83 SR |
484 | * |
485 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. | |
bc0c38d1 | 486 | */ |
e309b41d | 487 | void |
bc0c38d1 SR |
488 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
489 | { | |
3928a8a2 | 490 | int ret; |
bc0c38d1 | 491 | |
4c11d7ae | 492 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 493 | __raw_spin_lock(&ftrace_max_lock); |
bc0c38d1 | 494 | |
d769041f SR |
495 | ftrace_disable_cpu(); |
496 | ||
3928a8a2 SR |
497 | ring_buffer_reset(max_tr.buffer); |
498 | ret = ring_buffer_swap_cpu(max_tr.buffer, tr->buffer, cpu); | |
499 | ||
d769041f SR |
500 | ftrace_enable_cpu(); |
501 | ||
3928a8a2 | 502 | WARN_ON_ONCE(ret); |
bc0c38d1 SR |
503 | |
504 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 505 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
506 | } |
507 | ||
4fcdae83 SR |
508 | /** |
509 | * register_tracer - register a tracer with the ftrace system. | |
510 | * @type - the plugin for the tracer | |
511 | * | |
512 | * Register a new plugin tracer. | |
513 | */ | |
bc0c38d1 SR |
514 | int register_tracer(struct tracer *type) |
515 | { | |
516 | struct tracer *t; | |
517 | int len; | |
518 | int ret = 0; | |
519 | ||
520 | if (!type->name) { | |
521 | pr_info("Tracer must have a name\n"); | |
522 | return -1; | |
523 | } | |
524 | ||
525 | mutex_lock(&trace_types_lock); | |
526 | for (t = trace_types; t; t = t->next) { | |
527 | if (strcmp(type->name, t->name) == 0) { | |
528 | /* already found */ | |
529 | pr_info("Trace %s already registered\n", | |
530 | type->name); | |
531 | ret = -1; | |
532 | goto out; | |
533 | } | |
534 | } | |
535 | ||
60a11774 SR |
536 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
537 | if (type->selftest) { | |
538 | struct tracer *saved_tracer = current_trace; | |
60a11774 | 539 | struct trace_array *tr = &global_trace; |
60a11774 SR |
540 | int i; |
541 | /* | |
542 | * Run a selftest on this tracer. | |
543 | * Here we reset the trace buffer, and set the current | |
544 | * tracer to be this tracer. The tracer can then run some | |
545 | * internal tracing to verify that everything is in order. | |
546 | * If we fail, we do not register this tracer. | |
547 | */ | |
ab46428c | 548 | for_each_tracing_cpu(i) { |
3928a8a2 | 549 | tracing_reset(tr, i); |
60a11774 SR |
550 | } |
551 | current_trace = type; | |
60a11774 SR |
552 | /* the test is responsible for initializing and enabling */ |
553 | pr_info("Testing tracer %s: ", type->name); | |
554 | ret = type->selftest(type, tr); | |
555 | /* the test is responsible for resetting too */ | |
556 | current_trace = saved_tracer; | |
60a11774 SR |
557 | if (ret) { |
558 | printk(KERN_CONT "FAILED!\n"); | |
559 | goto out; | |
560 | } | |
1d4db00a | 561 | /* Only reset on passing, to avoid touching corrupted buffers */ |
ab46428c | 562 | for_each_tracing_cpu(i) { |
3928a8a2 | 563 | tracing_reset(tr, i); |
1d4db00a | 564 | } |
60a11774 SR |
565 | printk(KERN_CONT "PASSED\n"); |
566 | } | |
567 | #endif | |
568 | ||
bc0c38d1 SR |
569 | type->next = trace_types; |
570 | trace_types = type; | |
571 | len = strlen(type->name); | |
572 | if (len > max_tracer_type_len) | |
573 | max_tracer_type_len = len; | |
60a11774 | 574 | |
bc0c38d1 SR |
575 | out: |
576 | mutex_unlock(&trace_types_lock); | |
577 | ||
578 | return ret; | |
579 | } | |
580 | ||
581 | void unregister_tracer(struct tracer *type) | |
582 | { | |
583 | struct tracer **t; | |
584 | int len; | |
585 | ||
586 | mutex_lock(&trace_types_lock); | |
587 | for (t = &trace_types; *t; t = &(*t)->next) { | |
588 | if (*t == type) | |
589 | goto found; | |
590 | } | |
591 | pr_info("Trace %s not registered\n", type->name); | |
592 | goto out; | |
593 | ||
594 | found: | |
595 | *t = (*t)->next; | |
596 | if (strlen(type->name) != max_tracer_type_len) | |
597 | goto out; | |
598 | ||
599 | max_tracer_type_len = 0; | |
600 | for (t = &trace_types; *t; t = &(*t)->next) { | |
601 | len = strlen((*t)->name); | |
602 | if (len > max_tracer_type_len) | |
603 | max_tracer_type_len = len; | |
604 | } | |
605 | out: | |
606 | mutex_unlock(&trace_types_lock); | |
607 | } | |
608 | ||
3928a8a2 | 609 | void tracing_reset(struct trace_array *tr, int cpu) |
bc0c38d1 | 610 | { |
d769041f | 611 | ftrace_disable_cpu(); |
3928a8a2 | 612 | ring_buffer_reset_cpu(tr->buffer, cpu); |
d769041f | 613 | ftrace_enable_cpu(); |
bc0c38d1 SR |
614 | } |
615 | ||
bc0c38d1 SR |
616 | #define SAVED_CMDLINES 128 |
617 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; | |
618 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; | |
619 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; | |
620 | static int cmdline_idx; | |
621 | static DEFINE_SPINLOCK(trace_cmdline_lock); | |
25b0b44a | 622 | |
25b0b44a SR |
623 | /* temporary disable recording */ |
624 | atomic_t trace_record_cmdline_disabled __read_mostly; | |
bc0c38d1 SR |
625 | |
626 | static void trace_init_cmdlines(void) | |
627 | { | |
628 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); | |
629 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); | |
630 | cmdline_idx = 0; | |
631 | } | |
632 | ||
0f048701 SR |
633 | static int trace_stop_count; |
634 | static DEFINE_SPINLOCK(tracing_start_lock); | |
635 | ||
636 | /** | |
637 | * tracing_start - quick start of the tracer | |
638 | * | |
639 | * If tracing is enabled but was stopped by tracing_stop, | |
640 | * this will start the tracer back up. | |
641 | */ | |
642 | void tracing_start(void) | |
643 | { | |
644 | struct ring_buffer *buffer; | |
645 | unsigned long flags; | |
646 | ||
647 | if (tracing_disabled) | |
648 | return; | |
649 | ||
650 | spin_lock_irqsave(&tracing_start_lock, flags); | |
651 | if (--trace_stop_count) | |
652 | goto out; | |
653 | ||
654 | if (trace_stop_count < 0) { | |
655 | /* Someone screwed up their debugging */ | |
656 | WARN_ON_ONCE(1); | |
657 | trace_stop_count = 0; | |
658 | goto out; | |
659 | } | |
660 | ||
661 | ||
662 | buffer = global_trace.buffer; | |
663 | if (buffer) | |
664 | ring_buffer_record_enable(buffer); | |
665 | ||
666 | buffer = max_tr.buffer; | |
667 | if (buffer) | |
668 | ring_buffer_record_enable(buffer); | |
669 | ||
670 | ftrace_start(); | |
671 | out: | |
672 | spin_unlock_irqrestore(&tracing_start_lock, flags); | |
673 | } | |
674 | ||
675 | /** | |
676 | * tracing_stop - quick stop of the tracer | |
677 | * | |
678 | * Light weight way to stop tracing. Use in conjunction with | |
679 | * tracing_start. | |
680 | */ | |
681 | void tracing_stop(void) | |
682 | { | |
683 | struct ring_buffer *buffer; | |
684 | unsigned long flags; | |
685 | ||
686 | ftrace_stop(); | |
687 | spin_lock_irqsave(&tracing_start_lock, flags); | |
688 | if (trace_stop_count++) | |
689 | goto out; | |
690 | ||
691 | buffer = global_trace.buffer; | |
692 | if (buffer) | |
693 | ring_buffer_record_disable(buffer); | |
694 | ||
695 | buffer = max_tr.buffer; | |
696 | if (buffer) | |
697 | ring_buffer_record_disable(buffer); | |
698 | ||
699 | out: | |
700 | spin_unlock_irqrestore(&tracing_start_lock, flags); | |
701 | } | |
702 | ||
e309b41d | 703 | void trace_stop_cmdline_recording(void); |
bc0c38d1 | 704 | |
e309b41d | 705 | static void trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
706 | { |
707 | unsigned map; | |
708 | unsigned idx; | |
709 | ||
710 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
711 | return; | |
712 | ||
713 | /* | |
714 | * It's not the end of the world if we don't get | |
715 | * the lock, but we also don't want to spin | |
716 | * nor do we want to disable interrupts, | |
717 | * so if we miss here, then better luck next time. | |
718 | */ | |
719 | if (!spin_trylock(&trace_cmdline_lock)) | |
720 | return; | |
721 | ||
722 | idx = map_pid_to_cmdline[tsk->pid]; | |
723 | if (idx >= SAVED_CMDLINES) { | |
724 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; | |
725 | ||
726 | map = map_cmdline_to_pid[idx]; | |
727 | if (map <= PID_MAX_DEFAULT) | |
728 | map_pid_to_cmdline[map] = (unsigned)-1; | |
729 | ||
730 | map_pid_to_cmdline[tsk->pid] = idx; | |
731 | ||
732 | cmdline_idx = idx; | |
733 | } | |
734 | ||
735 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); | |
736 | ||
737 | spin_unlock(&trace_cmdline_lock); | |
738 | } | |
739 | ||
e309b41d | 740 | static char *trace_find_cmdline(int pid) |
bc0c38d1 SR |
741 | { |
742 | char *cmdline = "<...>"; | |
743 | unsigned map; | |
744 | ||
745 | if (!pid) | |
746 | return "<idle>"; | |
747 | ||
748 | if (pid > PID_MAX_DEFAULT) | |
749 | goto out; | |
750 | ||
751 | map = map_pid_to_cmdline[pid]; | |
752 | if (map >= SAVED_CMDLINES) | |
753 | goto out; | |
754 | ||
755 | cmdline = saved_cmdlines[map]; | |
756 | ||
757 | out: | |
758 | return cmdline; | |
759 | } | |
760 | ||
e309b41d | 761 | void tracing_record_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
762 | { |
763 | if (atomic_read(&trace_record_cmdline_disabled)) | |
764 | return; | |
765 | ||
766 | trace_save_cmdline(tsk); | |
767 | } | |
768 | ||
45dcd8b8 | 769 | void |
38697053 SR |
770 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags, |
771 | int pc) | |
bc0c38d1 SR |
772 | { |
773 | struct task_struct *tsk = current; | |
bc0c38d1 | 774 | |
777e208d SR |
775 | entry->preempt_count = pc & 0xff; |
776 | entry->pid = (tsk) ? tsk->pid : 0; | |
777 | entry->flags = | |
9244489a | 778 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT |
2e2ca155 | 779 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
9244489a SR |
780 | #else |
781 | TRACE_FLAG_IRQS_NOSUPPORT | | |
782 | #endif | |
bc0c38d1 SR |
783 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
784 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | | |
785 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); | |
786 | } | |
787 | ||
e309b41d | 788 | void |
6fb44b71 | 789 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
38697053 SR |
790 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
791 | int pc) | |
bc0c38d1 | 792 | { |
3928a8a2 | 793 | struct ring_buffer_event *event; |
777e208d | 794 | struct ftrace_entry *entry; |
dcb6308f | 795 | unsigned long irq_flags; |
bc0c38d1 | 796 | |
d769041f SR |
797 | /* If we are reading the ring buffer, don't trace */ |
798 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) | |
799 | return; | |
800 | ||
3928a8a2 SR |
801 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
802 | &irq_flags); | |
803 | if (!event) | |
804 | return; | |
805 | entry = ring_buffer_event_data(event); | |
38697053 | 806 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
807 | entry->ent.type = TRACE_FN; |
808 | entry->ip = ip; | |
809 | entry->parent_ip = parent_ip; | |
3928a8a2 | 810 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
bc0c38d1 SR |
811 | } |
812 | ||
e309b41d | 813 | void |
2e0f5761 | 814 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
38697053 SR |
815 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
816 | int pc) | |
2e0f5761 IM |
817 | { |
818 | if (likely(!atomic_read(&data->disabled))) | |
38697053 | 819 | trace_function(tr, data, ip, parent_ip, flags, pc); |
2e0f5761 IM |
820 | } |
821 | ||
38697053 SR |
822 | static void ftrace_trace_stack(struct trace_array *tr, |
823 | struct trace_array_cpu *data, | |
824 | unsigned long flags, | |
825 | int skip, int pc) | |
86387f7e | 826 | { |
c2c80529 | 827 | #ifdef CONFIG_STACKTRACE |
3928a8a2 | 828 | struct ring_buffer_event *event; |
777e208d | 829 | struct stack_entry *entry; |
86387f7e | 830 | struct stack_trace trace; |
3928a8a2 | 831 | unsigned long irq_flags; |
86387f7e IM |
832 | |
833 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) | |
834 | return; | |
835 | ||
3928a8a2 SR |
836 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
837 | &irq_flags); | |
838 | if (!event) | |
839 | return; | |
840 | entry = ring_buffer_event_data(event); | |
38697053 | 841 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d | 842 | entry->ent.type = TRACE_STACK; |
86387f7e | 843 | |
777e208d | 844 | memset(&entry->caller, 0, sizeof(entry->caller)); |
86387f7e IM |
845 | |
846 | trace.nr_entries = 0; | |
847 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
848 | trace.skip = skip; | |
777e208d | 849 | trace.entries = entry->caller; |
86387f7e IM |
850 | |
851 | save_stack_trace(&trace); | |
3928a8a2 | 852 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
c2c80529 | 853 | #endif |
f0a920d5 IM |
854 | } |
855 | ||
38697053 SR |
856 | void __trace_stack(struct trace_array *tr, |
857 | struct trace_array_cpu *data, | |
858 | unsigned long flags, | |
859 | int skip) | |
860 | { | |
861 | ftrace_trace_stack(tr, data, flags, skip, preempt_count()); | |
862 | } | |
863 | ||
864 | static void | |
865 | ftrace_trace_special(void *__tr, void *__data, | |
866 | unsigned long arg1, unsigned long arg2, unsigned long arg3, | |
867 | int pc) | |
a4feb834 | 868 | { |
3928a8a2 | 869 | struct ring_buffer_event *event; |
a4feb834 IM |
870 | struct trace_array_cpu *data = __data; |
871 | struct trace_array *tr = __tr; | |
777e208d | 872 | struct special_entry *entry; |
a4feb834 IM |
873 | unsigned long irq_flags; |
874 | ||
3928a8a2 SR |
875 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
876 | &irq_flags); | |
877 | if (!event) | |
878 | return; | |
879 | entry = ring_buffer_event_data(event); | |
38697053 | 880 | tracing_generic_entry_update(&entry->ent, 0, pc); |
777e208d SR |
881 | entry->ent.type = TRACE_SPECIAL; |
882 | entry->arg1 = arg1; | |
883 | entry->arg2 = arg2; | |
884 | entry->arg3 = arg3; | |
3928a8a2 | 885 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 886 | ftrace_trace_stack(tr, data, irq_flags, 4, pc); |
a4feb834 IM |
887 | |
888 | trace_wake_up(); | |
889 | } | |
890 | ||
38697053 SR |
891 | void |
892 | __trace_special(void *__tr, void *__data, | |
893 | unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
894 | { | |
895 | ftrace_trace_special(__tr, __data, arg1, arg2, arg3, preempt_count()); | |
896 | } | |
897 | ||
e309b41d | 898 | void |
bc0c38d1 SR |
899 | tracing_sched_switch_trace(struct trace_array *tr, |
900 | struct trace_array_cpu *data, | |
86387f7e IM |
901 | struct task_struct *prev, |
902 | struct task_struct *next, | |
38697053 | 903 | unsigned long flags, int pc) |
bc0c38d1 | 904 | { |
3928a8a2 | 905 | struct ring_buffer_event *event; |
777e208d | 906 | struct ctx_switch_entry *entry; |
dcb6308f | 907 | unsigned long irq_flags; |
bc0c38d1 | 908 | |
3928a8a2 SR |
909 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
910 | &irq_flags); | |
911 | if (!event) | |
912 | return; | |
913 | entry = ring_buffer_event_data(event); | |
38697053 | 914 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
915 | entry->ent.type = TRACE_CTX; |
916 | entry->prev_pid = prev->pid; | |
917 | entry->prev_prio = prev->prio; | |
918 | entry->prev_state = prev->state; | |
919 | entry->next_pid = next->pid; | |
920 | entry->next_prio = next->prio; | |
921 | entry->next_state = next->state; | |
922 | entry->next_cpu = task_cpu(next); | |
3928a8a2 | 923 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 924 | ftrace_trace_stack(tr, data, flags, 5, pc); |
bc0c38d1 SR |
925 | } |
926 | ||
57422797 IM |
927 | void |
928 | tracing_sched_wakeup_trace(struct trace_array *tr, | |
929 | struct trace_array_cpu *data, | |
86387f7e IM |
930 | struct task_struct *wakee, |
931 | struct task_struct *curr, | |
38697053 | 932 | unsigned long flags, int pc) |
57422797 | 933 | { |
3928a8a2 | 934 | struct ring_buffer_event *event; |
777e208d | 935 | struct ctx_switch_entry *entry; |
57422797 IM |
936 | unsigned long irq_flags; |
937 | ||
3928a8a2 SR |
938 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
939 | &irq_flags); | |
940 | if (!event) | |
941 | return; | |
942 | entry = ring_buffer_event_data(event); | |
38697053 | 943 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
944 | entry->ent.type = TRACE_WAKE; |
945 | entry->prev_pid = curr->pid; | |
946 | entry->prev_prio = curr->prio; | |
947 | entry->prev_state = curr->state; | |
948 | entry->next_pid = wakee->pid; | |
949 | entry->next_prio = wakee->prio; | |
950 | entry->next_state = wakee->state; | |
951 | entry->next_cpu = task_cpu(wakee); | |
3928a8a2 | 952 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 953 | ftrace_trace_stack(tr, data, flags, 6, pc); |
017730c1 IM |
954 | |
955 | trace_wake_up(); | |
57422797 IM |
956 | } |
957 | ||
4902f884 SR |
958 | void |
959 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
960 | { | |
961 | struct trace_array *tr = &global_trace; | |
962 | struct trace_array_cpu *data; | |
4902f884 | 963 | int cpu; |
38697053 | 964 | int pc; |
4902f884 | 965 | |
c76f0694 | 966 | if (tracing_disabled) |
4902f884 SR |
967 | return; |
968 | ||
38697053 SR |
969 | pc = preempt_count(); |
970 | preempt_disable_notrace(); | |
4902f884 SR |
971 | cpu = raw_smp_processor_id(); |
972 | data = tr->data[cpu]; | |
4902f884 | 973 | |
3ea2e6d7 | 974 | if (likely(!atomic_read(&data->disabled))) |
38697053 | 975 | ftrace_trace_special(tr, data, arg1, arg2, arg3, pc); |
4902f884 | 976 | |
38697053 | 977 | preempt_enable_notrace(); |
4902f884 SR |
978 | } |
979 | ||
606576ce | 980 | #ifdef CONFIG_FUNCTION_TRACER |
e309b41d | 981 | static void |
b2a866f9 | 982 | function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip) |
2e0f5761 IM |
983 | { |
984 | struct trace_array *tr = &global_trace; | |
985 | struct trace_array_cpu *data; | |
986 | unsigned long flags; | |
987 | long disabled; | |
38697053 SR |
988 | int cpu, resched; |
989 | int pc; | |
2e0f5761 | 990 | |
60bc0800 | 991 | if (unlikely(!ftrace_function_enabled)) |
2e0f5761 IM |
992 | return; |
993 | ||
38697053 | 994 | pc = preempt_count(); |
182e9f5f | 995 | resched = ftrace_preempt_disable(); |
38697053 | 996 | local_save_flags(flags); |
2e0f5761 IM |
997 | cpu = raw_smp_processor_id(); |
998 | data = tr->data[cpu]; | |
999 | disabled = atomic_inc_return(&data->disabled); | |
1000 | ||
1001 | if (likely(disabled == 1)) | |
38697053 | 1002 | trace_function(tr, data, ip, parent_ip, flags, pc); |
2e0f5761 IM |
1003 | |
1004 | atomic_dec(&data->disabled); | |
182e9f5f | 1005 | ftrace_preempt_enable(resched); |
2e0f5761 IM |
1006 | } |
1007 | ||
b2a866f9 SR |
1008 | static void |
1009 | function_trace_call(unsigned long ip, unsigned long parent_ip) | |
1010 | { | |
1011 | struct trace_array *tr = &global_trace; | |
1012 | struct trace_array_cpu *data; | |
1013 | unsigned long flags; | |
1014 | long disabled; | |
1015 | int cpu; | |
1016 | int pc; | |
1017 | ||
1018 | if (unlikely(!ftrace_function_enabled)) | |
1019 | return; | |
1020 | ||
1021 | /* | |
1022 | * Need to use raw, since this must be called before the | |
1023 | * recursive protection is performed. | |
1024 | */ | |
1025 | raw_local_irq_save(flags); | |
1026 | cpu = raw_smp_processor_id(); | |
1027 | data = tr->data[cpu]; | |
1028 | disabled = atomic_inc_return(&data->disabled); | |
1029 | ||
1030 | if (likely(disabled == 1)) { | |
1031 | pc = preempt_count(); | |
1032 | trace_function(tr, data, ip, parent_ip, flags, pc); | |
1033 | } | |
1034 | ||
1035 | atomic_dec(&data->disabled); | |
1036 | raw_local_irq_restore(flags); | |
1037 | } | |
1038 | ||
2e0f5761 IM |
1039 | static struct ftrace_ops trace_ops __read_mostly = |
1040 | { | |
1041 | .func = function_trace_call, | |
1042 | }; | |
1043 | ||
e309b41d | 1044 | void tracing_start_function_trace(void) |
2e0f5761 | 1045 | { |
60bc0800 | 1046 | ftrace_function_enabled = 0; |
b2a866f9 SR |
1047 | |
1048 | if (trace_flags & TRACE_ITER_PREEMPTONLY) | |
1049 | trace_ops.func = function_trace_call_preempt_only; | |
1050 | else | |
1051 | trace_ops.func = function_trace_call; | |
1052 | ||
2e0f5761 | 1053 | register_ftrace_function(&trace_ops); |
9036990d | 1054 | ftrace_function_enabled = 1; |
2e0f5761 IM |
1055 | } |
1056 | ||
e309b41d | 1057 | void tracing_stop_function_trace(void) |
2e0f5761 | 1058 | { |
60bc0800 | 1059 | ftrace_function_enabled = 0; |
2e0f5761 IM |
1060 | unregister_ftrace_function(&trace_ops); |
1061 | } | |
1062 | #endif | |
1063 | ||
bc0c38d1 SR |
1064 | enum trace_file_type { |
1065 | TRACE_FILE_LAT_FMT = 1, | |
1066 | }; | |
1067 | ||
5a90f577 SR |
1068 | static void trace_iterator_increment(struct trace_iterator *iter, int cpu) |
1069 | { | |
d769041f SR |
1070 | /* Don't allow ftrace to trace into the ring buffers */ |
1071 | ftrace_disable_cpu(); | |
1072 | ||
5a90f577 | 1073 | iter->idx++; |
d769041f SR |
1074 | if (iter->buffer_iter[iter->cpu]) |
1075 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); | |
1076 | ||
1077 | ftrace_enable_cpu(); | |
5a90f577 SR |
1078 | } |
1079 | ||
e309b41d | 1080 | static struct trace_entry * |
3928a8a2 | 1081 | peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts) |
dd0e545f | 1082 | { |
3928a8a2 SR |
1083 | struct ring_buffer_event *event; |
1084 | struct ring_buffer_iter *buf_iter = iter->buffer_iter[cpu]; | |
dd0e545f | 1085 | |
d769041f SR |
1086 | /* Don't allow ftrace to trace into the ring buffers */ |
1087 | ftrace_disable_cpu(); | |
1088 | ||
1089 | if (buf_iter) | |
1090 | event = ring_buffer_iter_peek(buf_iter, ts); | |
1091 | else | |
1092 | event = ring_buffer_peek(iter->tr->buffer, cpu, ts); | |
1093 | ||
1094 | ftrace_enable_cpu(); | |
1095 | ||
3928a8a2 | 1096 | return event ? ring_buffer_event_data(event) : NULL; |
dd0e545f | 1097 | } |
d769041f | 1098 | |
dd0e545f | 1099 | static struct trace_entry * |
3928a8a2 | 1100 | __find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
bc0c38d1 | 1101 | { |
3928a8a2 | 1102 | struct ring_buffer *buffer = iter->tr->buffer; |
bc0c38d1 | 1103 | struct trace_entry *ent, *next = NULL; |
3928a8a2 | 1104 | u64 next_ts = 0, ts; |
bc0c38d1 SR |
1105 | int next_cpu = -1; |
1106 | int cpu; | |
1107 | ||
ab46428c | 1108 | for_each_tracing_cpu(cpu) { |
dd0e545f | 1109 | |
3928a8a2 SR |
1110 | if (ring_buffer_empty_cpu(buffer, cpu)) |
1111 | continue; | |
dd0e545f | 1112 | |
3928a8a2 | 1113 | ent = peek_next_entry(iter, cpu, &ts); |
dd0e545f | 1114 | |
cdd31cd2 IM |
1115 | /* |
1116 | * Pick the entry with the smallest timestamp: | |
1117 | */ | |
3928a8a2 | 1118 | if (ent && (!next || ts < next_ts)) { |
bc0c38d1 SR |
1119 | next = ent; |
1120 | next_cpu = cpu; | |
3928a8a2 | 1121 | next_ts = ts; |
bc0c38d1 SR |
1122 | } |
1123 | } | |
1124 | ||
1125 | if (ent_cpu) | |
1126 | *ent_cpu = next_cpu; | |
1127 | ||
3928a8a2 SR |
1128 | if (ent_ts) |
1129 | *ent_ts = next_ts; | |
1130 | ||
bc0c38d1 SR |
1131 | return next; |
1132 | } | |
1133 | ||
dd0e545f SR |
1134 | /* Find the next real entry, without updating the iterator itself */ |
1135 | static struct trace_entry * | |
3928a8a2 | 1136 | find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
bc0c38d1 | 1137 | { |
3928a8a2 | 1138 | return __find_next_entry(iter, ent_cpu, ent_ts); |
dd0e545f SR |
1139 | } |
1140 | ||
1141 | /* Find the next real entry, and increment the iterator to the next entry */ | |
1142 | static void *find_next_entry_inc(struct trace_iterator *iter) | |
1143 | { | |
3928a8a2 | 1144 | iter->ent = __find_next_entry(iter, &iter->cpu, &iter->ts); |
dd0e545f | 1145 | |
3928a8a2 | 1146 | if (iter->ent) |
dd0e545f SR |
1147 | trace_iterator_increment(iter, iter->cpu); |
1148 | ||
3928a8a2 | 1149 | return iter->ent ? iter : NULL; |
b3806b43 | 1150 | } |
bc0c38d1 | 1151 | |
e309b41d | 1152 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 | 1153 | { |
d769041f SR |
1154 | /* Don't allow ftrace to trace into the ring buffers */ |
1155 | ftrace_disable_cpu(); | |
3928a8a2 | 1156 | ring_buffer_consume(iter->tr->buffer, iter->cpu, &iter->ts); |
d769041f | 1157 | ftrace_enable_cpu(); |
bc0c38d1 SR |
1158 | } |
1159 | ||
e309b41d | 1160 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
1161 | { |
1162 | struct trace_iterator *iter = m->private; | |
bc0c38d1 | 1163 | int i = (int)*pos; |
4e3c3333 | 1164 | void *ent; |
bc0c38d1 SR |
1165 | |
1166 | (*pos)++; | |
1167 | ||
1168 | /* can't go backwards */ | |
1169 | if (iter->idx > i) | |
1170 | return NULL; | |
1171 | ||
1172 | if (iter->idx < 0) | |
1173 | ent = find_next_entry_inc(iter); | |
1174 | else | |
1175 | ent = iter; | |
1176 | ||
1177 | while (ent && iter->idx < i) | |
1178 | ent = find_next_entry_inc(iter); | |
1179 | ||
1180 | iter->pos = *pos; | |
1181 | ||
bc0c38d1 SR |
1182 | return ent; |
1183 | } | |
1184 | ||
1185 | static void *s_start(struct seq_file *m, loff_t *pos) | |
1186 | { | |
1187 | struct trace_iterator *iter = m->private; | |
1188 | void *p = NULL; | |
1189 | loff_t l = 0; | |
3928a8a2 | 1190 | int cpu; |
bc0c38d1 SR |
1191 | |
1192 | mutex_lock(&trace_types_lock); | |
1193 | ||
d15f57f2 SR |
1194 | if (!current_trace || current_trace != iter->trace) { |
1195 | mutex_unlock(&trace_types_lock); | |
bc0c38d1 | 1196 | return NULL; |
d15f57f2 | 1197 | } |
bc0c38d1 SR |
1198 | |
1199 | atomic_inc(&trace_record_cmdline_disabled); | |
1200 | ||
bc0c38d1 SR |
1201 | if (*pos != iter->pos) { |
1202 | iter->ent = NULL; | |
1203 | iter->cpu = 0; | |
1204 | iter->idx = -1; | |
1205 | ||
d769041f SR |
1206 | ftrace_disable_cpu(); |
1207 | ||
3928a8a2 SR |
1208 | for_each_tracing_cpu(cpu) { |
1209 | ring_buffer_iter_reset(iter->buffer_iter[cpu]); | |
4c11d7ae | 1210 | } |
bc0c38d1 | 1211 | |
d769041f SR |
1212 | ftrace_enable_cpu(); |
1213 | ||
bc0c38d1 SR |
1214 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
1215 | ; | |
1216 | ||
1217 | } else { | |
4c11d7ae | 1218 | l = *pos - 1; |
bc0c38d1 SR |
1219 | p = s_next(m, p, &l); |
1220 | } | |
1221 | ||
1222 | return p; | |
1223 | } | |
1224 | ||
1225 | static void s_stop(struct seq_file *m, void *p) | |
1226 | { | |
bc0c38d1 | 1227 | atomic_dec(&trace_record_cmdline_disabled); |
bc0c38d1 SR |
1228 | mutex_unlock(&trace_types_lock); |
1229 | } | |
1230 | ||
76094a2c | 1231 | #ifdef CONFIG_KRETPROBES |
b3aa5577 | 1232 | static inline const char *kretprobed(const char *name) |
76094a2c | 1233 | { |
b3aa5577 SR |
1234 | static const char tramp_name[] = "kretprobe_trampoline"; |
1235 | int size = sizeof(tramp_name); | |
1236 | ||
1237 | if (strncmp(tramp_name, name, size) == 0) | |
1238 | return "[unknown/kretprobe'd]"; | |
1239 | return name; | |
76094a2c AS |
1240 | } |
1241 | #else | |
b3aa5577 | 1242 | static inline const char *kretprobed(const char *name) |
76094a2c | 1243 | { |
b3aa5577 | 1244 | return name; |
76094a2c AS |
1245 | } |
1246 | #endif /* CONFIG_KRETPROBES */ | |
1247 | ||
b3806b43 | 1248 | static int |
214023c3 | 1249 | seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) |
bc0c38d1 SR |
1250 | { |
1251 | #ifdef CONFIG_KALLSYMS | |
1252 | char str[KSYM_SYMBOL_LEN]; | |
b3aa5577 | 1253 | const char *name; |
bc0c38d1 SR |
1254 | |
1255 | kallsyms_lookup(address, NULL, NULL, NULL, str); | |
1256 | ||
b3aa5577 SR |
1257 | name = kretprobed(str); |
1258 | ||
1259 | return trace_seq_printf(s, fmt, name); | |
bc0c38d1 | 1260 | #endif |
b3806b43 | 1261 | return 1; |
bc0c38d1 SR |
1262 | } |
1263 | ||
b3806b43 | 1264 | static int |
214023c3 SR |
1265 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
1266 | unsigned long address) | |
bc0c38d1 SR |
1267 | { |
1268 | #ifdef CONFIG_KALLSYMS | |
1269 | char str[KSYM_SYMBOL_LEN]; | |
b3aa5577 | 1270 | const char *name; |
bc0c38d1 SR |
1271 | |
1272 | sprint_symbol(str, address); | |
b3aa5577 SR |
1273 | name = kretprobed(str); |
1274 | ||
1275 | return trace_seq_printf(s, fmt, name); | |
bc0c38d1 | 1276 | #endif |
b3806b43 | 1277 | return 1; |
bc0c38d1 SR |
1278 | } |
1279 | ||
1280 | #ifndef CONFIG_64BIT | |
1281 | # define IP_FMT "%08lx" | |
1282 | #else | |
1283 | # define IP_FMT "%016lx" | |
1284 | #endif | |
1285 | ||
e309b41d | 1286 | static int |
214023c3 | 1287 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) |
bc0c38d1 | 1288 | { |
b3806b43 SR |
1289 | int ret; |
1290 | ||
1291 | if (!ip) | |
1292 | return trace_seq_printf(s, "0"); | |
bc0c38d1 SR |
1293 | |
1294 | if (sym_flags & TRACE_ITER_SYM_OFFSET) | |
b3806b43 | 1295 | ret = seq_print_sym_offset(s, "%s", ip); |
bc0c38d1 | 1296 | else |
b3806b43 SR |
1297 | ret = seq_print_sym_short(s, "%s", ip); |
1298 | ||
1299 | if (!ret) | |
1300 | return 0; | |
bc0c38d1 SR |
1301 | |
1302 | if (sym_flags & TRACE_ITER_SYM_ADDR) | |
b3806b43 SR |
1303 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
1304 | return ret; | |
bc0c38d1 SR |
1305 | } |
1306 | ||
e309b41d | 1307 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 | 1308 | { |
a6168353 ME |
1309 | seq_puts(m, "# _------=> CPU# \n"); |
1310 | seq_puts(m, "# / _-----=> irqs-off \n"); | |
1311 | seq_puts(m, "# | / _----=> need-resched \n"); | |
1312 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); | |
1313 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); | |
1314 | seq_puts(m, "# |||| / \n"); | |
1315 | seq_puts(m, "# ||||| delay \n"); | |
1316 | seq_puts(m, "# cmd pid ||||| time | caller \n"); | |
1317 | seq_puts(m, "# \\ / ||||| \\ | / \n"); | |
bc0c38d1 SR |
1318 | } |
1319 | ||
e309b41d | 1320 | static void print_func_help_header(struct seq_file *m) |
bc0c38d1 | 1321 | { |
a6168353 ME |
1322 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
1323 | seq_puts(m, "# | | | | |\n"); | |
bc0c38d1 SR |
1324 | } |
1325 | ||
1326 | ||
e309b41d | 1327 | static void |
bc0c38d1 SR |
1328 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
1329 | { | |
1330 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); | |
1331 | struct trace_array *tr = iter->tr; | |
1332 | struct trace_array_cpu *data = tr->data[tr->cpu]; | |
1333 | struct tracer *type = current_trace; | |
3928a8a2 SR |
1334 | unsigned long total; |
1335 | unsigned long entries; | |
bc0c38d1 SR |
1336 | const char *name = "preemption"; |
1337 | ||
1338 | if (type) | |
1339 | name = type->name; | |
1340 | ||
3928a8a2 SR |
1341 | entries = ring_buffer_entries(iter->tr->buffer); |
1342 | total = entries + | |
1343 | ring_buffer_overruns(iter->tr->buffer); | |
bc0c38d1 SR |
1344 | |
1345 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", | |
1346 | name, UTS_RELEASE); | |
1347 | seq_puts(m, "-----------------------------------" | |
1348 | "---------------------------------\n"); | |
1349 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" | |
1350 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", | |
57f50be1 | 1351 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 1352 | entries, |
4c11d7ae | 1353 | total, |
bc0c38d1 SR |
1354 | tr->cpu, |
1355 | #if defined(CONFIG_PREEMPT_NONE) | |
1356 | "server", | |
1357 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
1358 | "desktop", | |
b5c21b45 | 1359 | #elif defined(CONFIG_PREEMPT) |
bc0c38d1 SR |
1360 | "preempt", |
1361 | #else | |
1362 | "unknown", | |
1363 | #endif | |
1364 | /* These are reserved for later use */ | |
1365 | 0, 0, 0, 0); | |
1366 | #ifdef CONFIG_SMP | |
1367 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
1368 | #else | |
1369 | seq_puts(m, ")\n"); | |
1370 | #endif | |
1371 | seq_puts(m, " -----------------\n"); | |
1372 | seq_printf(m, " | task: %.16s-%d " | |
1373 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", | |
1374 | data->comm, data->pid, data->uid, data->nice, | |
1375 | data->policy, data->rt_priority); | |
1376 | seq_puts(m, " -----------------\n"); | |
1377 | ||
1378 | if (data->critical_start) { | |
1379 | seq_puts(m, " => started at: "); | |
214023c3 SR |
1380 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
1381 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 | 1382 | seq_puts(m, "\n => ended at: "); |
214023c3 SR |
1383 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
1384 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 SR |
1385 | seq_puts(m, "\n"); |
1386 | } | |
1387 | ||
1388 | seq_puts(m, "\n"); | |
1389 | } | |
1390 | ||
e309b41d | 1391 | static void |
214023c3 | 1392 | lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) |
bc0c38d1 SR |
1393 | { |
1394 | int hardirq, softirq; | |
1395 | char *comm; | |
1396 | ||
777e208d | 1397 | comm = trace_find_cmdline(entry->pid); |
bc0c38d1 | 1398 | |
777e208d | 1399 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
a6168353 | 1400 | trace_seq_printf(s, "%3d", cpu); |
214023c3 | 1401 | trace_seq_printf(s, "%c%c", |
9244489a SR |
1402 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : |
1403 | (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : '.', | |
777e208d | 1404 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); |
bc0c38d1 | 1405 | |
777e208d SR |
1406 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; |
1407 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; | |
afc2abc0 | 1408 | if (hardirq && softirq) { |
214023c3 | 1409 | trace_seq_putc(s, 'H'); |
afc2abc0 IM |
1410 | } else { |
1411 | if (hardirq) { | |
214023c3 | 1412 | trace_seq_putc(s, 'h'); |
afc2abc0 | 1413 | } else { |
bc0c38d1 | 1414 | if (softirq) |
214023c3 | 1415 | trace_seq_putc(s, 's'); |
bc0c38d1 | 1416 | else |
214023c3 | 1417 | trace_seq_putc(s, '.'); |
bc0c38d1 SR |
1418 | } |
1419 | } | |
1420 | ||
777e208d SR |
1421 | if (entry->preempt_count) |
1422 | trace_seq_printf(s, "%x", entry->preempt_count); | |
bc0c38d1 | 1423 | else |
214023c3 | 1424 | trace_seq_puts(s, "."); |
bc0c38d1 SR |
1425 | } |
1426 | ||
1427 | unsigned long preempt_mark_thresh = 100; | |
1428 | ||
e309b41d | 1429 | static void |
3928a8a2 | 1430 | lat_print_timestamp(struct trace_seq *s, u64 abs_usecs, |
bc0c38d1 SR |
1431 | unsigned long rel_usecs) |
1432 | { | |
214023c3 | 1433 | trace_seq_printf(s, " %4lldus", abs_usecs); |
bc0c38d1 | 1434 | if (rel_usecs > preempt_mark_thresh) |
214023c3 | 1435 | trace_seq_puts(s, "!: "); |
bc0c38d1 | 1436 | else if (rel_usecs > 1) |
214023c3 | 1437 | trace_seq_puts(s, "+: "); |
bc0c38d1 | 1438 | else |
214023c3 | 1439 | trace_seq_puts(s, " : "); |
bc0c38d1 SR |
1440 | } |
1441 | ||
1442 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; | |
1443 | ||
fc5e27ae PP |
1444 | /* |
1445 | * The message is supposed to contain an ending newline. | |
1446 | * If the printing stops prematurely, try to add a newline of our own. | |
1447 | */ | |
1448 | void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter) | |
dd0e545f | 1449 | { |
dd0e545f | 1450 | struct trace_entry *ent; |
777e208d | 1451 | struct trace_field_cont *cont; |
fc5e27ae | 1452 | bool ok = true; |
dd0e545f | 1453 | |
3928a8a2 | 1454 | ent = peek_next_entry(iter, iter->cpu, NULL); |
dd0e545f SR |
1455 | if (!ent || ent->type != TRACE_CONT) { |
1456 | trace_seq_putc(s, '\n'); | |
1457 | return; | |
1458 | } | |
1459 | ||
1460 | do { | |
777e208d | 1461 | cont = (struct trace_field_cont *)ent; |
fc5e27ae | 1462 | if (ok) |
777e208d | 1463 | ok = (trace_seq_printf(s, "%s", cont->buf) > 0); |
d769041f SR |
1464 | |
1465 | ftrace_disable_cpu(); | |
1466 | ||
1467 | if (iter->buffer_iter[iter->cpu]) | |
1468 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); | |
1469 | else | |
1470 | ring_buffer_consume(iter->tr->buffer, iter->cpu, NULL); | |
1471 | ||
1472 | ftrace_enable_cpu(); | |
1473 | ||
3928a8a2 | 1474 | ent = peek_next_entry(iter, iter->cpu, NULL); |
dd0e545f | 1475 | } while (ent && ent->type == TRACE_CONT); |
fc5e27ae PP |
1476 | |
1477 | if (!ok) | |
1478 | trace_seq_putc(s, '\n'); | |
dd0e545f SR |
1479 | } |
1480 | ||
a309720c SR |
1481 | static void test_cpu_buff_start(struct trace_iterator *iter) |
1482 | { | |
1483 | struct trace_seq *s = &iter->seq; | |
1484 | ||
1485 | if (cpu_isset(iter->cpu, iter->started)) | |
1486 | return; | |
1487 | ||
1488 | cpu_set(iter->cpu, iter->started); | |
1489 | trace_seq_printf(s, "##### CPU %u buffer started ####\n", iter->cpu); | |
1490 | } | |
1491 | ||
2c4f035f | 1492 | static enum print_line_t |
214023c3 | 1493 | print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) |
bc0c38d1 | 1494 | { |
214023c3 | 1495 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1496 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
3928a8a2 | 1497 | struct trace_entry *next_entry; |
bc0c38d1 SR |
1498 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); |
1499 | struct trace_entry *entry = iter->ent; | |
1500 | unsigned long abs_usecs; | |
1501 | unsigned long rel_usecs; | |
3928a8a2 | 1502 | u64 next_ts; |
bc0c38d1 | 1503 | char *comm; |
bac524d3 | 1504 | int S, T; |
86387f7e | 1505 | int i; |
d17d9691 | 1506 | unsigned state; |
bc0c38d1 | 1507 | |
dd0e545f | 1508 | if (entry->type == TRACE_CONT) |
2c4f035f | 1509 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1510 | |
a309720c SR |
1511 | test_cpu_buff_start(iter); |
1512 | ||
3928a8a2 SR |
1513 | next_entry = find_next_entry(iter, NULL, &next_ts); |
1514 | if (!next_entry) | |
1515 | next_ts = iter->ts; | |
1516 | rel_usecs = ns2usecs(next_ts - iter->ts); | |
1517 | abs_usecs = ns2usecs(iter->ts - iter->tr->time_start); | |
bc0c38d1 SR |
1518 | |
1519 | if (verbose) { | |
777e208d | 1520 | comm = trace_find_cmdline(entry->pid); |
a6168353 | 1521 | trace_seq_printf(s, "%16s %5d %3d %d %08x %08x [%08lx]" |
214023c3 SR |
1522 | " %ld.%03ldms (+%ld.%03ldms): ", |
1523 | comm, | |
777e208d SR |
1524 | entry->pid, cpu, entry->flags, |
1525 | entry->preempt_count, trace_idx, | |
3928a8a2 | 1526 | ns2usecs(iter->ts), |
214023c3 SR |
1527 | abs_usecs/1000, |
1528 | abs_usecs % 1000, rel_usecs/1000, | |
1529 | rel_usecs % 1000); | |
bc0c38d1 | 1530 | } else { |
f29c73fe IM |
1531 | lat_print_generic(s, entry, cpu); |
1532 | lat_print_timestamp(s, abs_usecs, rel_usecs); | |
bc0c38d1 SR |
1533 | } |
1534 | switch (entry->type) { | |
777e208d | 1535 | case TRACE_FN: { |
7104f300 SR |
1536 | struct ftrace_entry *field; |
1537 | ||
1538 | trace_assign_type(field, entry); | |
777e208d SR |
1539 | |
1540 | seq_print_ip_sym(s, field->ip, sym_flags); | |
214023c3 | 1541 | trace_seq_puts(s, " ("); |
b3aa5577 | 1542 | seq_print_ip_sym(s, field->parent_ip, sym_flags); |
214023c3 | 1543 | trace_seq_puts(s, ")\n"); |
bc0c38d1 | 1544 | break; |
777e208d | 1545 | } |
bc0c38d1 | 1546 | case TRACE_CTX: |
777e208d | 1547 | case TRACE_WAKE: { |
7104f300 SR |
1548 | struct ctx_switch_entry *field; |
1549 | ||
1550 | trace_assign_type(field, entry); | |
777e208d SR |
1551 | |
1552 | T = field->next_state < sizeof(state_to_char) ? | |
1553 | state_to_char[field->next_state] : 'X'; | |
bac524d3 | 1554 | |
777e208d SR |
1555 | state = field->prev_state ? |
1556 | __ffs(field->prev_state) + 1 : 0; | |
d17d9691 | 1557 | S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X'; |
777e208d | 1558 | comm = trace_find_cmdline(field->next_pid); |
80b5e940 | 1559 | trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n", |
777e208d SR |
1560 | field->prev_pid, |
1561 | field->prev_prio, | |
57422797 | 1562 | S, entry->type == TRACE_CTX ? "==>" : " +", |
777e208d SR |
1563 | field->next_cpu, |
1564 | field->next_pid, | |
1565 | field->next_prio, | |
bac524d3 | 1566 | T, comm); |
bc0c38d1 | 1567 | break; |
777e208d SR |
1568 | } |
1569 | case TRACE_SPECIAL: { | |
7104f300 SR |
1570 | struct special_entry *field; |
1571 | ||
1572 | trace_assign_type(field, entry); | |
777e208d | 1573 | |
88a4216c | 1574 | trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
1575 | field->arg1, |
1576 | field->arg2, | |
1577 | field->arg3); | |
f0a920d5 | 1578 | break; |
777e208d SR |
1579 | } |
1580 | case TRACE_STACK: { | |
7104f300 SR |
1581 | struct stack_entry *field; |
1582 | ||
1583 | trace_assign_type(field, entry); | |
777e208d | 1584 | |
86387f7e IM |
1585 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
1586 | if (i) | |
1587 | trace_seq_puts(s, " <= "); | |
777e208d | 1588 | seq_print_ip_sym(s, field->caller[i], sym_flags); |
86387f7e IM |
1589 | } |
1590 | trace_seq_puts(s, "\n"); | |
1591 | break; | |
777e208d SR |
1592 | } |
1593 | case TRACE_PRINT: { | |
7104f300 SR |
1594 | struct print_entry *field; |
1595 | ||
1596 | trace_assign_type(field, entry); | |
777e208d SR |
1597 | |
1598 | seq_print_ip_sym(s, field->ip, sym_flags); | |
1599 | trace_seq_printf(s, ": %s", field->buf); | |
1600 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
1601 | trace_seq_print_cont(s, iter); |
1602 | break; | |
777e208d | 1603 | } |
89b2f978 | 1604 | default: |
214023c3 | 1605 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
bc0c38d1 | 1606 | } |
2c4f035f | 1607 | return TRACE_TYPE_HANDLED; |
bc0c38d1 SR |
1608 | } |
1609 | ||
2c4f035f | 1610 | static enum print_line_t print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 1611 | { |
214023c3 | 1612 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1613 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 1614 | struct trace_entry *entry; |
bc0c38d1 SR |
1615 | unsigned long usec_rem; |
1616 | unsigned long long t; | |
1617 | unsigned long secs; | |
1618 | char *comm; | |
b3806b43 | 1619 | int ret; |
bac524d3 | 1620 | int S, T; |
86387f7e | 1621 | int i; |
bc0c38d1 | 1622 | |
4e3c3333 | 1623 | entry = iter->ent; |
dd0e545f SR |
1624 | |
1625 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1626 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1627 | |
a309720c SR |
1628 | test_cpu_buff_start(iter); |
1629 | ||
777e208d | 1630 | comm = trace_find_cmdline(iter->ent->pid); |
bc0c38d1 | 1631 | |
3928a8a2 | 1632 | t = ns2usecs(iter->ts); |
bc0c38d1 SR |
1633 | usec_rem = do_div(t, 1000000ULL); |
1634 | secs = (unsigned long)t; | |
1635 | ||
777e208d | 1636 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
f29c73fe | 1637 | if (!ret) |
2c4f035f | 1638 | return TRACE_TYPE_PARTIAL_LINE; |
a6168353 | 1639 | ret = trace_seq_printf(s, "[%03d] ", iter->cpu); |
f29c73fe | 1640 | if (!ret) |
2c4f035f | 1641 | return TRACE_TYPE_PARTIAL_LINE; |
f29c73fe IM |
1642 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); |
1643 | if (!ret) | |
2c4f035f | 1644 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 SR |
1645 | |
1646 | switch (entry->type) { | |
777e208d | 1647 | case TRACE_FN: { |
7104f300 SR |
1648 | struct ftrace_entry *field; |
1649 | ||
1650 | trace_assign_type(field, entry); | |
777e208d SR |
1651 | |
1652 | ret = seq_print_ip_sym(s, field->ip, sym_flags); | |
b3806b43 | 1653 | if (!ret) |
2c4f035f | 1654 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1655 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
777e208d | 1656 | field->parent_ip) { |
b3806b43 SR |
1657 | ret = trace_seq_printf(s, " <-"); |
1658 | if (!ret) | |
2c4f035f | 1659 | return TRACE_TYPE_PARTIAL_LINE; |
b3aa5577 SR |
1660 | ret = seq_print_ip_sym(s, |
1661 | field->parent_ip, | |
1662 | sym_flags); | |
b3806b43 | 1663 | if (!ret) |
2c4f035f | 1664 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1665 | } |
b3806b43 SR |
1666 | ret = trace_seq_printf(s, "\n"); |
1667 | if (!ret) | |
2c4f035f | 1668 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1669 | break; |
777e208d | 1670 | } |
bc0c38d1 | 1671 | case TRACE_CTX: |
777e208d | 1672 | case TRACE_WAKE: { |
7104f300 SR |
1673 | struct ctx_switch_entry *field; |
1674 | ||
1675 | trace_assign_type(field, entry); | |
777e208d SR |
1676 | |
1677 | S = field->prev_state < sizeof(state_to_char) ? | |
1678 | state_to_char[field->prev_state] : 'X'; | |
1679 | T = field->next_state < sizeof(state_to_char) ? | |
1680 | state_to_char[field->next_state] : 'X'; | |
80b5e940 | 1681 | ret = trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c\n", |
777e208d SR |
1682 | field->prev_pid, |
1683 | field->prev_prio, | |
b3806b43 | 1684 | S, |
57422797 | 1685 | entry->type == TRACE_CTX ? "==>" : " +", |
777e208d SR |
1686 | field->next_cpu, |
1687 | field->next_pid, | |
1688 | field->next_prio, | |
bac524d3 | 1689 | T); |
b3806b43 | 1690 | if (!ret) |
2c4f035f | 1691 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1692 | break; |
777e208d SR |
1693 | } |
1694 | case TRACE_SPECIAL: { | |
7104f300 SR |
1695 | struct special_entry *field; |
1696 | ||
1697 | trace_assign_type(field, entry); | |
777e208d | 1698 | |
88a4216c | 1699 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
1700 | field->arg1, |
1701 | field->arg2, | |
1702 | field->arg3); | |
f0a920d5 | 1703 | if (!ret) |
2c4f035f | 1704 | return TRACE_TYPE_PARTIAL_LINE; |
f0a920d5 | 1705 | break; |
777e208d SR |
1706 | } |
1707 | case TRACE_STACK: { | |
7104f300 SR |
1708 | struct stack_entry *field; |
1709 | ||
1710 | trace_assign_type(field, entry); | |
777e208d | 1711 | |
86387f7e IM |
1712 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
1713 | if (i) { | |
1714 | ret = trace_seq_puts(s, " <= "); | |
1715 | if (!ret) | |
2c4f035f | 1716 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e | 1717 | } |
777e208d | 1718 | ret = seq_print_ip_sym(s, field->caller[i], |
86387f7e IM |
1719 | sym_flags); |
1720 | if (!ret) | |
2c4f035f | 1721 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e IM |
1722 | } |
1723 | ret = trace_seq_puts(s, "\n"); | |
1724 | if (!ret) | |
2c4f035f | 1725 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e | 1726 | break; |
777e208d SR |
1727 | } |
1728 | case TRACE_PRINT: { | |
7104f300 SR |
1729 | struct print_entry *field; |
1730 | ||
1731 | trace_assign_type(field, entry); | |
777e208d SR |
1732 | |
1733 | seq_print_ip_sym(s, field->ip, sym_flags); | |
1734 | trace_seq_printf(s, ": %s", field->buf); | |
1735 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
1736 | trace_seq_print_cont(s, iter); |
1737 | break; | |
bc0c38d1 | 1738 | } |
777e208d | 1739 | } |
2c4f035f | 1740 | return TRACE_TYPE_HANDLED; |
bc0c38d1 SR |
1741 | } |
1742 | ||
2c4f035f | 1743 | static enum print_line_t print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 IM |
1744 | { |
1745 | struct trace_seq *s = &iter->seq; | |
1746 | struct trace_entry *entry; | |
1747 | int ret; | |
bac524d3 | 1748 | int S, T; |
f9896bf3 IM |
1749 | |
1750 | entry = iter->ent; | |
dd0e545f SR |
1751 | |
1752 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1753 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1754 | |
f9896bf3 | 1755 | ret = trace_seq_printf(s, "%d %d %llu ", |
777e208d | 1756 | entry->pid, iter->cpu, iter->ts); |
f9896bf3 | 1757 | if (!ret) |
2c4f035f | 1758 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 IM |
1759 | |
1760 | switch (entry->type) { | |
777e208d | 1761 | case TRACE_FN: { |
7104f300 SR |
1762 | struct ftrace_entry *field; |
1763 | ||
1764 | trace_assign_type(field, entry); | |
777e208d | 1765 | |
f9896bf3 | 1766 | ret = trace_seq_printf(s, "%x %x\n", |
777e208d SR |
1767 | field->ip, |
1768 | field->parent_ip); | |
f9896bf3 | 1769 | if (!ret) |
2c4f035f | 1770 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 | 1771 | break; |
777e208d | 1772 | } |
f9896bf3 | 1773 | case TRACE_CTX: |
777e208d | 1774 | case TRACE_WAKE: { |
7104f300 SR |
1775 | struct ctx_switch_entry *field; |
1776 | ||
1777 | trace_assign_type(field, entry); | |
777e208d SR |
1778 | |
1779 | S = field->prev_state < sizeof(state_to_char) ? | |
1780 | state_to_char[field->prev_state] : 'X'; | |
1781 | T = field->next_state < sizeof(state_to_char) ? | |
1782 | state_to_char[field->next_state] : 'X'; | |
57422797 IM |
1783 | if (entry->type == TRACE_WAKE) |
1784 | S = '+'; | |
80b5e940 | 1785 | ret = trace_seq_printf(s, "%d %d %c %d %d %d %c\n", |
777e208d SR |
1786 | field->prev_pid, |
1787 | field->prev_prio, | |
f9896bf3 | 1788 | S, |
777e208d SR |
1789 | field->next_cpu, |
1790 | field->next_pid, | |
1791 | field->next_prio, | |
bac524d3 | 1792 | T); |
f9896bf3 | 1793 | if (!ret) |
2c4f035f | 1794 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 | 1795 | break; |
777e208d | 1796 | } |
f0a920d5 | 1797 | case TRACE_SPECIAL: |
777e208d | 1798 | case TRACE_STACK: { |
7104f300 SR |
1799 | struct special_entry *field; |
1800 | ||
1801 | trace_assign_type(field, entry); | |
777e208d | 1802 | |
88a4216c | 1803 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
1804 | field->arg1, |
1805 | field->arg2, | |
1806 | field->arg3); | |
f0a920d5 | 1807 | if (!ret) |
2c4f035f | 1808 | return TRACE_TYPE_PARTIAL_LINE; |
f0a920d5 | 1809 | break; |
777e208d SR |
1810 | } |
1811 | case TRACE_PRINT: { | |
7104f300 SR |
1812 | struct print_entry *field; |
1813 | ||
1814 | trace_assign_type(field, entry); | |
777e208d SR |
1815 | |
1816 | trace_seq_printf(s, "# %lx %s", field->ip, field->buf); | |
1817 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
1818 | trace_seq_print_cont(s, iter); |
1819 | break; | |
f9896bf3 | 1820 | } |
777e208d | 1821 | } |
2c4f035f | 1822 | return TRACE_TYPE_HANDLED; |
f9896bf3 IM |
1823 | } |
1824 | ||
cb0f12aa IM |
1825 | #define SEQ_PUT_FIELD_RET(s, x) \ |
1826 | do { \ | |
1827 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ | |
1828 | return 0; \ | |
1829 | } while (0) | |
1830 | ||
5e3ca0ec IM |
1831 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
1832 | do { \ | |
ad0a3b68 | 1833 | BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES); \ |
5e3ca0ec IM |
1834 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ |
1835 | return 0; \ | |
1836 | } while (0) | |
1837 | ||
2c4f035f | 1838 | static enum print_line_t print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec IM |
1839 | { |
1840 | struct trace_seq *s = &iter->seq; | |
1841 | unsigned char newline = '\n'; | |
1842 | struct trace_entry *entry; | |
bac524d3 | 1843 | int S, T; |
5e3ca0ec IM |
1844 | |
1845 | entry = iter->ent; | |
dd0e545f SR |
1846 | |
1847 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1848 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1849 | |
777e208d | 1850 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); |
5e3ca0ec | 1851 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); |
3928a8a2 | 1852 | SEQ_PUT_HEX_FIELD_RET(s, iter->ts); |
5e3ca0ec IM |
1853 | |
1854 | switch (entry->type) { | |
777e208d | 1855 | case TRACE_FN: { |
7104f300 SR |
1856 | struct ftrace_entry *field; |
1857 | ||
1858 | trace_assign_type(field, entry); | |
777e208d SR |
1859 | |
1860 | SEQ_PUT_HEX_FIELD_RET(s, field->ip); | |
1861 | SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip); | |
5e3ca0ec | 1862 | break; |
777e208d | 1863 | } |
5e3ca0ec | 1864 | case TRACE_CTX: |
777e208d | 1865 | case TRACE_WAKE: { |
7104f300 SR |
1866 | struct ctx_switch_entry *field; |
1867 | ||
1868 | trace_assign_type(field, entry); | |
777e208d SR |
1869 | |
1870 | S = field->prev_state < sizeof(state_to_char) ? | |
1871 | state_to_char[field->prev_state] : 'X'; | |
1872 | T = field->next_state < sizeof(state_to_char) ? | |
1873 | state_to_char[field->next_state] : 'X'; | |
57422797 IM |
1874 | if (entry->type == TRACE_WAKE) |
1875 | S = '+'; | |
777e208d SR |
1876 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid); |
1877 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio); | |
5e3ca0ec | 1878 | SEQ_PUT_HEX_FIELD_RET(s, S); |
777e208d SR |
1879 | SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu); |
1880 | SEQ_PUT_HEX_FIELD_RET(s, field->next_pid); | |
1881 | SEQ_PUT_HEX_FIELD_RET(s, field->next_prio); | |
bac524d3 | 1882 | SEQ_PUT_HEX_FIELD_RET(s, T); |
5e3ca0ec | 1883 | break; |
777e208d | 1884 | } |
5e3ca0ec | 1885 | case TRACE_SPECIAL: |
777e208d | 1886 | case TRACE_STACK: { |
7104f300 SR |
1887 | struct special_entry *field; |
1888 | ||
1889 | trace_assign_type(field, entry); | |
777e208d SR |
1890 | |
1891 | SEQ_PUT_HEX_FIELD_RET(s, field->arg1); | |
1892 | SEQ_PUT_HEX_FIELD_RET(s, field->arg2); | |
1893 | SEQ_PUT_HEX_FIELD_RET(s, field->arg3); | |
5e3ca0ec IM |
1894 | break; |
1895 | } | |
777e208d | 1896 | } |
5e3ca0ec IM |
1897 | SEQ_PUT_FIELD_RET(s, newline); |
1898 | ||
2c4f035f | 1899 | return TRACE_TYPE_HANDLED; |
5e3ca0ec IM |
1900 | } |
1901 | ||
2c4f035f | 1902 | static enum print_line_t print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa IM |
1903 | { |
1904 | struct trace_seq *s = &iter->seq; | |
1905 | struct trace_entry *entry; | |
1906 | ||
1907 | entry = iter->ent; | |
dd0e545f SR |
1908 | |
1909 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1910 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1911 | |
777e208d | 1912 | SEQ_PUT_FIELD_RET(s, entry->pid); |
072ba498 | 1913 | SEQ_PUT_FIELD_RET(s, entry->cpu); |
3928a8a2 | 1914 | SEQ_PUT_FIELD_RET(s, iter->ts); |
cb0f12aa IM |
1915 | |
1916 | switch (entry->type) { | |
777e208d | 1917 | case TRACE_FN: { |
7104f300 SR |
1918 | struct ftrace_entry *field; |
1919 | ||
1920 | trace_assign_type(field, entry); | |
777e208d SR |
1921 | |
1922 | SEQ_PUT_FIELD_RET(s, field->ip); | |
1923 | SEQ_PUT_FIELD_RET(s, field->parent_ip); | |
cb0f12aa | 1924 | break; |
777e208d SR |
1925 | } |
1926 | case TRACE_CTX: { | |
7104f300 SR |
1927 | struct ctx_switch_entry *field; |
1928 | ||
1929 | trace_assign_type(field, entry); | |
777e208d SR |
1930 | |
1931 | SEQ_PUT_FIELD_RET(s, field->prev_pid); | |
1932 | SEQ_PUT_FIELD_RET(s, field->prev_prio); | |
1933 | SEQ_PUT_FIELD_RET(s, field->prev_state); | |
1934 | SEQ_PUT_FIELD_RET(s, field->next_pid); | |
1935 | SEQ_PUT_FIELD_RET(s, field->next_prio); | |
1936 | SEQ_PUT_FIELD_RET(s, field->next_state); | |
cb0f12aa | 1937 | break; |
777e208d | 1938 | } |
f0a920d5 | 1939 | case TRACE_SPECIAL: |
777e208d | 1940 | case TRACE_STACK: { |
7104f300 SR |
1941 | struct special_entry *field; |
1942 | ||
1943 | trace_assign_type(field, entry); | |
777e208d SR |
1944 | |
1945 | SEQ_PUT_FIELD_RET(s, field->arg1); | |
1946 | SEQ_PUT_FIELD_RET(s, field->arg2); | |
1947 | SEQ_PUT_FIELD_RET(s, field->arg3); | |
f0a920d5 | 1948 | break; |
cb0f12aa | 1949 | } |
777e208d | 1950 | } |
cb0f12aa IM |
1951 | return 1; |
1952 | } | |
1953 | ||
bc0c38d1 SR |
1954 | static int trace_empty(struct trace_iterator *iter) |
1955 | { | |
bc0c38d1 SR |
1956 | int cpu; |
1957 | ||
ab46428c | 1958 | for_each_tracing_cpu(cpu) { |
d769041f SR |
1959 | if (iter->buffer_iter[cpu]) { |
1960 | if (!ring_buffer_iter_empty(iter->buffer_iter[cpu])) | |
1961 | return 0; | |
1962 | } else { | |
1963 | if (!ring_buffer_empty_cpu(iter->tr->buffer, cpu)) | |
1964 | return 0; | |
1965 | } | |
bc0c38d1 | 1966 | } |
d769041f | 1967 | |
797d3712 | 1968 | return 1; |
bc0c38d1 SR |
1969 | } |
1970 | ||
2c4f035f | 1971 | static enum print_line_t print_trace_line(struct trace_iterator *iter) |
f9896bf3 | 1972 | { |
2c4f035f FW |
1973 | enum print_line_t ret; |
1974 | ||
1975 | if (iter->trace && iter->trace->print_line) { | |
1976 | ret = iter->trace->print_line(iter); | |
1977 | if (ret != TRACE_TYPE_UNHANDLED) | |
1978 | return ret; | |
1979 | } | |
72829bc3 | 1980 | |
cb0f12aa IM |
1981 | if (trace_flags & TRACE_ITER_BIN) |
1982 | return print_bin_fmt(iter); | |
1983 | ||
5e3ca0ec IM |
1984 | if (trace_flags & TRACE_ITER_HEX) |
1985 | return print_hex_fmt(iter); | |
1986 | ||
f9896bf3 IM |
1987 | if (trace_flags & TRACE_ITER_RAW) |
1988 | return print_raw_fmt(iter); | |
1989 | ||
1990 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
1991 | return print_lat_fmt(iter, iter->idx, iter->cpu); | |
1992 | ||
1993 | return print_trace_fmt(iter); | |
1994 | } | |
1995 | ||
bc0c38d1 SR |
1996 | static int s_show(struct seq_file *m, void *v) |
1997 | { | |
1998 | struct trace_iterator *iter = v; | |
1999 | ||
2000 | if (iter->ent == NULL) { | |
2001 | if (iter->tr) { | |
2002 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
2003 | seq_puts(m, "#\n"); | |
2004 | } | |
2005 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { | |
2006 | /* print nothing if the buffers are empty */ | |
2007 | if (trace_empty(iter)) | |
2008 | return 0; | |
2009 | print_trace_header(m, iter); | |
2010 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
2011 | print_lat_help_header(m); | |
2012 | } else { | |
2013 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
2014 | print_func_help_header(m); | |
2015 | } | |
2016 | } else { | |
f9896bf3 | 2017 | print_trace_line(iter); |
214023c3 | 2018 | trace_print_seq(m, &iter->seq); |
bc0c38d1 SR |
2019 | } |
2020 | ||
2021 | return 0; | |
2022 | } | |
2023 | ||
2024 | static struct seq_operations tracer_seq_ops = { | |
4bf39a94 IM |
2025 | .start = s_start, |
2026 | .next = s_next, | |
2027 | .stop = s_stop, | |
2028 | .show = s_show, | |
bc0c38d1 SR |
2029 | }; |
2030 | ||
e309b41d | 2031 | static struct trace_iterator * |
bc0c38d1 SR |
2032 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
2033 | { | |
2034 | struct trace_iterator *iter; | |
3928a8a2 SR |
2035 | struct seq_file *m; |
2036 | int cpu; | |
bc0c38d1 | 2037 | |
60a11774 SR |
2038 | if (tracing_disabled) { |
2039 | *ret = -ENODEV; | |
2040 | return NULL; | |
2041 | } | |
2042 | ||
bc0c38d1 SR |
2043 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
2044 | if (!iter) { | |
2045 | *ret = -ENOMEM; | |
2046 | goto out; | |
2047 | } | |
2048 | ||
2049 | mutex_lock(&trace_types_lock); | |
2050 | if (current_trace && current_trace->print_max) | |
2051 | iter->tr = &max_tr; | |
2052 | else | |
2053 | iter->tr = inode->i_private; | |
2054 | iter->trace = current_trace; | |
2055 | iter->pos = -1; | |
2056 | ||
3928a8a2 | 2057 | for_each_tracing_cpu(cpu) { |
d769041f | 2058 | |
3928a8a2 SR |
2059 | iter->buffer_iter[cpu] = |
2060 | ring_buffer_read_start(iter->tr->buffer, cpu); | |
d769041f | 2061 | |
3928a8a2 SR |
2062 | if (!iter->buffer_iter[cpu]) |
2063 | goto fail_buffer; | |
2064 | } | |
2065 | ||
bc0c38d1 SR |
2066 | /* TODO stop tracer */ |
2067 | *ret = seq_open(file, &tracer_seq_ops); | |
3928a8a2 SR |
2068 | if (*ret) |
2069 | goto fail_buffer; | |
bc0c38d1 | 2070 | |
3928a8a2 SR |
2071 | m = file->private_data; |
2072 | m->private = iter; | |
bc0c38d1 | 2073 | |
3928a8a2 | 2074 | /* stop the trace while dumping */ |
9036990d | 2075 | tracing_stop(); |
3928a8a2 SR |
2076 | |
2077 | if (iter->trace && iter->trace->open) | |
2078 | iter->trace->open(iter); | |
2079 | ||
bc0c38d1 SR |
2080 | mutex_unlock(&trace_types_lock); |
2081 | ||
2082 | out: | |
2083 | return iter; | |
3928a8a2 SR |
2084 | |
2085 | fail_buffer: | |
2086 | for_each_tracing_cpu(cpu) { | |
2087 | if (iter->buffer_iter[cpu]) | |
2088 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
2089 | } | |
2090 | mutex_unlock(&trace_types_lock); | |
2091 | ||
2092 | return ERR_PTR(-ENOMEM); | |
bc0c38d1 SR |
2093 | } |
2094 | ||
2095 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
2096 | { | |
60a11774 SR |
2097 | if (tracing_disabled) |
2098 | return -ENODEV; | |
2099 | ||
bc0c38d1 SR |
2100 | filp->private_data = inode->i_private; |
2101 | return 0; | |
2102 | } | |
2103 | ||
2104 | int tracing_release(struct inode *inode, struct file *file) | |
2105 | { | |
2106 | struct seq_file *m = (struct seq_file *)file->private_data; | |
2107 | struct trace_iterator *iter = m->private; | |
3928a8a2 | 2108 | int cpu; |
bc0c38d1 SR |
2109 | |
2110 | mutex_lock(&trace_types_lock); | |
3928a8a2 SR |
2111 | for_each_tracing_cpu(cpu) { |
2112 | if (iter->buffer_iter[cpu]) | |
2113 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
2114 | } | |
2115 | ||
bc0c38d1 SR |
2116 | if (iter->trace && iter->trace->close) |
2117 | iter->trace->close(iter); | |
2118 | ||
2119 | /* reenable tracing if it was previously enabled */ | |
9036990d | 2120 | tracing_start(); |
bc0c38d1 SR |
2121 | mutex_unlock(&trace_types_lock); |
2122 | ||
2123 | seq_release(inode, file); | |
2124 | kfree(iter); | |
2125 | return 0; | |
2126 | } | |
2127 | ||
2128 | static int tracing_open(struct inode *inode, struct file *file) | |
2129 | { | |
2130 | int ret; | |
2131 | ||
2132 | __tracing_open(inode, file, &ret); | |
2133 | ||
2134 | return ret; | |
2135 | } | |
2136 | ||
2137 | static int tracing_lt_open(struct inode *inode, struct file *file) | |
2138 | { | |
2139 | struct trace_iterator *iter; | |
2140 | int ret; | |
2141 | ||
2142 | iter = __tracing_open(inode, file, &ret); | |
2143 | ||
2144 | if (!ret) | |
2145 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
2146 | ||
2147 | return ret; | |
2148 | } | |
2149 | ||
2150 | ||
e309b41d | 2151 | static void * |
bc0c38d1 SR |
2152 | t_next(struct seq_file *m, void *v, loff_t *pos) |
2153 | { | |
2154 | struct tracer *t = m->private; | |
2155 | ||
2156 | (*pos)++; | |
2157 | ||
2158 | if (t) | |
2159 | t = t->next; | |
2160 | ||
2161 | m->private = t; | |
2162 | ||
2163 | return t; | |
2164 | } | |
2165 | ||
2166 | static void *t_start(struct seq_file *m, loff_t *pos) | |
2167 | { | |
2168 | struct tracer *t = m->private; | |
2169 | loff_t l = 0; | |
2170 | ||
2171 | mutex_lock(&trace_types_lock); | |
2172 | for (; t && l < *pos; t = t_next(m, t, &l)) | |
2173 | ; | |
2174 | ||
2175 | return t; | |
2176 | } | |
2177 | ||
2178 | static void t_stop(struct seq_file *m, void *p) | |
2179 | { | |
2180 | mutex_unlock(&trace_types_lock); | |
2181 | } | |
2182 | ||
2183 | static int t_show(struct seq_file *m, void *v) | |
2184 | { | |
2185 | struct tracer *t = v; | |
2186 | ||
2187 | if (!t) | |
2188 | return 0; | |
2189 | ||
2190 | seq_printf(m, "%s", t->name); | |
2191 | if (t->next) | |
2192 | seq_putc(m, ' '); | |
2193 | else | |
2194 | seq_putc(m, '\n'); | |
2195 | ||
2196 | return 0; | |
2197 | } | |
2198 | ||
2199 | static struct seq_operations show_traces_seq_ops = { | |
4bf39a94 IM |
2200 | .start = t_start, |
2201 | .next = t_next, | |
2202 | .stop = t_stop, | |
2203 | .show = t_show, | |
bc0c38d1 SR |
2204 | }; |
2205 | ||
2206 | static int show_traces_open(struct inode *inode, struct file *file) | |
2207 | { | |
2208 | int ret; | |
2209 | ||
60a11774 SR |
2210 | if (tracing_disabled) |
2211 | return -ENODEV; | |
2212 | ||
bc0c38d1 SR |
2213 | ret = seq_open(file, &show_traces_seq_ops); |
2214 | if (!ret) { | |
2215 | struct seq_file *m = file->private_data; | |
2216 | m->private = trace_types; | |
2217 | } | |
2218 | ||
2219 | return ret; | |
2220 | } | |
2221 | ||
2222 | static struct file_operations tracing_fops = { | |
4bf39a94 IM |
2223 | .open = tracing_open, |
2224 | .read = seq_read, | |
2225 | .llseek = seq_lseek, | |
2226 | .release = tracing_release, | |
bc0c38d1 SR |
2227 | }; |
2228 | ||
2229 | static struct file_operations tracing_lt_fops = { | |
4bf39a94 IM |
2230 | .open = tracing_lt_open, |
2231 | .read = seq_read, | |
2232 | .llseek = seq_lseek, | |
2233 | .release = tracing_release, | |
bc0c38d1 SR |
2234 | }; |
2235 | ||
2236 | static struct file_operations show_traces_fops = { | |
c7078de1 IM |
2237 | .open = show_traces_open, |
2238 | .read = seq_read, | |
2239 | .release = seq_release, | |
2240 | }; | |
2241 | ||
36dfe925 IM |
2242 | /* |
2243 | * Only trace on a CPU if the bitmask is set: | |
2244 | */ | |
2245 | static cpumask_t tracing_cpumask = CPU_MASK_ALL; | |
2246 | ||
2247 | /* | |
2248 | * When tracing/tracing_cpu_mask is modified then this holds | |
2249 | * the new bitmask we are about to install: | |
2250 | */ | |
2251 | static cpumask_t tracing_cpumask_new; | |
2252 | ||
2253 | /* | |
2254 | * The tracer itself will not take this lock, but still we want | |
2255 | * to provide a consistent cpumask to user-space: | |
2256 | */ | |
2257 | static DEFINE_MUTEX(tracing_cpumask_update_lock); | |
2258 | ||
2259 | /* | |
2260 | * Temporary storage for the character representation of the | |
2261 | * CPU bitmask (and one more byte for the newline): | |
2262 | */ | |
2263 | static char mask_str[NR_CPUS + 1]; | |
2264 | ||
c7078de1 IM |
2265 | static ssize_t |
2266 | tracing_cpumask_read(struct file *filp, char __user *ubuf, | |
2267 | size_t count, loff_t *ppos) | |
2268 | { | |
36dfe925 | 2269 | int len; |
c7078de1 IM |
2270 | |
2271 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 IM |
2272 | |
2273 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); | |
2274 | if (count - len < 2) { | |
2275 | count = -EINVAL; | |
2276 | goto out_err; | |
2277 | } | |
2278 | len += sprintf(mask_str + len, "\n"); | |
2279 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); | |
2280 | ||
2281 | out_err: | |
c7078de1 IM |
2282 | mutex_unlock(&tracing_cpumask_update_lock); |
2283 | ||
2284 | return count; | |
2285 | } | |
2286 | ||
2287 | static ssize_t | |
2288 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, | |
2289 | size_t count, loff_t *ppos) | |
2290 | { | |
36dfe925 | 2291 | int err, cpu; |
c7078de1 IM |
2292 | |
2293 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 | 2294 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
c7078de1 | 2295 | if (err) |
36dfe925 IM |
2296 | goto err_unlock; |
2297 | ||
92205c23 SR |
2298 | raw_local_irq_disable(); |
2299 | __raw_spin_lock(&ftrace_max_lock); | |
ab46428c | 2300 | for_each_tracing_cpu(cpu) { |
36dfe925 IM |
2301 | /* |
2302 | * Increase/decrease the disabled counter if we are | |
2303 | * about to flip a bit in the cpumask: | |
2304 | */ | |
2305 | if (cpu_isset(cpu, tracing_cpumask) && | |
2306 | !cpu_isset(cpu, tracing_cpumask_new)) { | |
2307 | atomic_inc(&global_trace.data[cpu]->disabled); | |
2308 | } | |
2309 | if (!cpu_isset(cpu, tracing_cpumask) && | |
2310 | cpu_isset(cpu, tracing_cpumask_new)) { | |
2311 | atomic_dec(&global_trace.data[cpu]->disabled); | |
2312 | } | |
2313 | } | |
92205c23 SR |
2314 | __raw_spin_unlock(&ftrace_max_lock); |
2315 | raw_local_irq_enable(); | |
36dfe925 IM |
2316 | |
2317 | tracing_cpumask = tracing_cpumask_new; | |
2318 | ||
2319 | mutex_unlock(&tracing_cpumask_update_lock); | |
c7078de1 IM |
2320 | |
2321 | return count; | |
36dfe925 IM |
2322 | |
2323 | err_unlock: | |
2324 | mutex_unlock(&tracing_cpumask_update_lock); | |
2325 | ||
2326 | return err; | |
c7078de1 IM |
2327 | } |
2328 | ||
2329 | static struct file_operations tracing_cpumask_fops = { | |
2330 | .open = tracing_open_generic, | |
2331 | .read = tracing_cpumask_read, | |
2332 | .write = tracing_cpumask_write, | |
bc0c38d1 SR |
2333 | }; |
2334 | ||
2335 | static ssize_t | |
2336 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, | |
2337 | size_t cnt, loff_t *ppos) | |
2338 | { | |
2339 | char *buf; | |
2340 | int r = 0; | |
2341 | int len = 0; | |
2342 | int i; | |
2343 | ||
2344 | /* calulate max size */ | |
2345 | for (i = 0; trace_options[i]; i++) { | |
2346 | len += strlen(trace_options[i]); | |
2347 | len += 3; /* "no" and space */ | |
2348 | } | |
2349 | ||
2350 | /* +2 for \n and \0 */ | |
2351 | buf = kmalloc(len + 2, GFP_KERNEL); | |
2352 | if (!buf) | |
2353 | return -ENOMEM; | |
2354 | ||
2355 | for (i = 0; trace_options[i]; i++) { | |
2356 | if (trace_flags & (1 << i)) | |
2357 | r += sprintf(buf + r, "%s ", trace_options[i]); | |
2358 | else | |
2359 | r += sprintf(buf + r, "no%s ", trace_options[i]); | |
2360 | } | |
2361 | ||
2362 | r += sprintf(buf + r, "\n"); | |
2363 | WARN_ON(r >= len + 2); | |
2364 | ||
36dfe925 | 2365 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2366 | |
2367 | kfree(buf); | |
2368 | ||
2369 | return r; | |
2370 | } | |
2371 | ||
2372 | static ssize_t | |
2373 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, | |
2374 | size_t cnt, loff_t *ppos) | |
2375 | { | |
2376 | char buf[64]; | |
2377 | char *cmp = buf; | |
2378 | int neg = 0; | |
2379 | int i; | |
2380 | ||
cffae437 SR |
2381 | if (cnt >= sizeof(buf)) |
2382 | return -EINVAL; | |
bc0c38d1 SR |
2383 | |
2384 | if (copy_from_user(&buf, ubuf, cnt)) | |
2385 | return -EFAULT; | |
2386 | ||
2387 | buf[cnt] = 0; | |
2388 | ||
2389 | if (strncmp(buf, "no", 2) == 0) { | |
2390 | neg = 1; | |
2391 | cmp += 2; | |
2392 | } | |
2393 | ||
2394 | for (i = 0; trace_options[i]; i++) { | |
2395 | int len = strlen(trace_options[i]); | |
2396 | ||
2397 | if (strncmp(cmp, trace_options[i], len) == 0) { | |
2398 | if (neg) | |
2399 | trace_flags &= ~(1 << i); | |
2400 | else | |
2401 | trace_flags |= (1 << i); | |
2402 | break; | |
2403 | } | |
2404 | } | |
442e544c IM |
2405 | /* |
2406 | * If no option could be set, return an error: | |
2407 | */ | |
2408 | if (!trace_options[i]) | |
2409 | return -EINVAL; | |
bc0c38d1 SR |
2410 | |
2411 | filp->f_pos += cnt; | |
2412 | ||
2413 | return cnt; | |
2414 | } | |
2415 | ||
2416 | static struct file_operations tracing_iter_fops = { | |
c7078de1 IM |
2417 | .open = tracing_open_generic, |
2418 | .read = tracing_iter_ctrl_read, | |
2419 | .write = tracing_iter_ctrl_write, | |
bc0c38d1 SR |
2420 | }; |
2421 | ||
7bd2f24c IM |
2422 | static const char readme_msg[] = |
2423 | "tracing mini-HOWTO:\n\n" | |
2424 | "# mkdir /debug\n" | |
2425 | "# mount -t debugfs nodev /debug\n\n" | |
2426 | "# cat /debug/tracing/available_tracers\n" | |
2427 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" | |
2428 | "# cat /debug/tracing/current_tracer\n" | |
2429 | "none\n" | |
2430 | "# echo sched_switch > /debug/tracing/current_tracer\n" | |
2431 | "# cat /debug/tracing/current_tracer\n" | |
2432 | "sched_switch\n" | |
2433 | "# cat /debug/tracing/iter_ctrl\n" | |
2434 | "noprint-parent nosym-offset nosym-addr noverbose\n" | |
2435 | "# echo print-parent > /debug/tracing/iter_ctrl\n" | |
2436 | "# echo 1 > /debug/tracing/tracing_enabled\n" | |
2437 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" | |
2438 | "echo 0 > /debug/tracing/tracing_enabled\n" | |
2439 | ; | |
2440 | ||
2441 | static ssize_t | |
2442 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
2443 | size_t cnt, loff_t *ppos) | |
2444 | { | |
2445 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
2446 | readme_msg, strlen(readme_msg)); | |
2447 | } | |
2448 | ||
2449 | static struct file_operations tracing_readme_fops = { | |
c7078de1 IM |
2450 | .open = tracing_open_generic, |
2451 | .read = tracing_readme_read, | |
7bd2f24c IM |
2452 | }; |
2453 | ||
bc0c38d1 SR |
2454 | static ssize_t |
2455 | tracing_ctrl_read(struct file *filp, char __user *ubuf, | |
2456 | size_t cnt, loff_t *ppos) | |
2457 | { | |
bc0c38d1 SR |
2458 | char buf[64]; |
2459 | int r; | |
2460 | ||
9036990d | 2461 | r = sprintf(buf, "%u\n", tracer_enabled); |
4e3c3333 | 2462 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2463 | } |
2464 | ||
2465 | static ssize_t | |
2466 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, | |
2467 | size_t cnt, loff_t *ppos) | |
2468 | { | |
2469 | struct trace_array *tr = filp->private_data; | |
bc0c38d1 | 2470 | char buf[64]; |
c6caeeb1 SR |
2471 | long val; |
2472 | int ret; | |
bc0c38d1 | 2473 | |
cffae437 SR |
2474 | if (cnt >= sizeof(buf)) |
2475 | return -EINVAL; | |
bc0c38d1 SR |
2476 | |
2477 | if (copy_from_user(&buf, ubuf, cnt)) | |
2478 | return -EFAULT; | |
2479 | ||
2480 | buf[cnt] = 0; | |
2481 | ||
c6caeeb1 SR |
2482 | ret = strict_strtoul(buf, 10, &val); |
2483 | if (ret < 0) | |
2484 | return ret; | |
bc0c38d1 SR |
2485 | |
2486 | val = !!val; | |
2487 | ||
2488 | mutex_lock(&trace_types_lock); | |
9036990d SR |
2489 | if (tracer_enabled ^ val) { |
2490 | if (val) { | |
bc0c38d1 | 2491 | tracer_enabled = 1; |
9036990d SR |
2492 | if (current_trace->start) |
2493 | current_trace->start(tr); | |
2494 | tracing_start(); | |
2495 | } else { | |
bc0c38d1 | 2496 | tracer_enabled = 0; |
9036990d SR |
2497 | tracing_stop(); |
2498 | if (current_trace->stop) | |
2499 | current_trace->stop(tr); | |
2500 | } | |
bc0c38d1 SR |
2501 | } |
2502 | mutex_unlock(&trace_types_lock); | |
2503 | ||
2504 | filp->f_pos += cnt; | |
2505 | ||
2506 | return cnt; | |
2507 | } | |
2508 | ||
2509 | static ssize_t | |
2510 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
2511 | size_t cnt, loff_t *ppos) | |
2512 | { | |
2513 | char buf[max_tracer_type_len+2]; | |
2514 | int r; | |
2515 | ||
2516 | mutex_lock(&trace_types_lock); | |
2517 | if (current_trace) | |
2518 | r = sprintf(buf, "%s\n", current_trace->name); | |
2519 | else | |
2520 | r = sprintf(buf, "\n"); | |
2521 | mutex_unlock(&trace_types_lock); | |
2522 | ||
4bf39a94 | 2523 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2524 | } |
2525 | ||
d9e54076 | 2526 | static int tracing_set_tracer(char *buf) |
bc0c38d1 SR |
2527 | { |
2528 | struct trace_array *tr = &global_trace; | |
2529 | struct tracer *t; | |
d9e54076 | 2530 | int ret = 0; |
bc0c38d1 SR |
2531 | |
2532 | mutex_lock(&trace_types_lock); | |
2533 | for (t = trace_types; t; t = t->next) { | |
2534 | if (strcmp(t->name, buf) == 0) | |
2535 | break; | |
2536 | } | |
c2931e05 FW |
2537 | if (!t) { |
2538 | ret = -EINVAL; | |
2539 | goto out; | |
2540 | } | |
2541 | if (t == current_trace) | |
bc0c38d1 SR |
2542 | goto out; |
2543 | ||
2544 | if (current_trace && current_trace->reset) | |
2545 | current_trace->reset(tr); | |
2546 | ||
2547 | current_trace = t; | |
2548 | if (t->init) | |
2549 | t->init(tr); | |
2550 | ||
2551 | out: | |
2552 | mutex_unlock(&trace_types_lock); | |
2553 | ||
d9e54076 PZ |
2554 | return ret; |
2555 | } | |
2556 | ||
2557 | static ssize_t | |
2558 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
2559 | size_t cnt, loff_t *ppos) | |
2560 | { | |
2561 | char buf[max_tracer_type_len+1]; | |
2562 | int i; | |
2563 | size_t ret; | |
2564 | ||
2565 | if (cnt > max_tracer_type_len) | |
2566 | cnt = max_tracer_type_len; | |
2567 | ||
2568 | if (copy_from_user(&buf, ubuf, cnt)) | |
2569 | return -EFAULT; | |
2570 | ||
2571 | buf[cnt] = 0; | |
2572 | ||
2573 | /* strip ending whitespace. */ | |
2574 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
2575 | buf[i] = 0; | |
2576 | ||
2577 | ret = tracing_set_tracer(buf); | |
2578 | if (!ret) | |
2579 | ret = cnt; | |
2580 | ||
60063a66 SR |
2581 | if (ret > 0) |
2582 | filp->f_pos += ret; | |
bc0c38d1 | 2583 | |
c2931e05 | 2584 | return ret; |
bc0c38d1 SR |
2585 | } |
2586 | ||
2587 | static ssize_t | |
2588 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
2589 | size_t cnt, loff_t *ppos) | |
2590 | { | |
2591 | unsigned long *ptr = filp->private_data; | |
2592 | char buf[64]; | |
2593 | int r; | |
2594 | ||
cffae437 | 2595 | r = snprintf(buf, sizeof(buf), "%ld\n", |
bc0c38d1 | 2596 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
cffae437 SR |
2597 | if (r > sizeof(buf)) |
2598 | r = sizeof(buf); | |
4bf39a94 | 2599 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2600 | } |
2601 | ||
2602 | static ssize_t | |
2603 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
2604 | size_t cnt, loff_t *ppos) | |
2605 | { | |
2606 | long *ptr = filp->private_data; | |
bc0c38d1 | 2607 | char buf[64]; |
c6caeeb1 SR |
2608 | long val; |
2609 | int ret; | |
bc0c38d1 | 2610 | |
cffae437 SR |
2611 | if (cnt >= sizeof(buf)) |
2612 | return -EINVAL; | |
bc0c38d1 SR |
2613 | |
2614 | if (copy_from_user(&buf, ubuf, cnt)) | |
2615 | return -EFAULT; | |
2616 | ||
2617 | buf[cnt] = 0; | |
2618 | ||
c6caeeb1 SR |
2619 | ret = strict_strtoul(buf, 10, &val); |
2620 | if (ret < 0) | |
2621 | return ret; | |
bc0c38d1 SR |
2622 | |
2623 | *ptr = val * 1000; | |
2624 | ||
2625 | return cnt; | |
2626 | } | |
2627 | ||
b3806b43 SR |
2628 | static atomic_t tracing_reader; |
2629 | ||
2630 | static int tracing_open_pipe(struct inode *inode, struct file *filp) | |
2631 | { | |
2632 | struct trace_iterator *iter; | |
2633 | ||
2634 | if (tracing_disabled) | |
2635 | return -ENODEV; | |
2636 | ||
2637 | /* We only allow for reader of the pipe */ | |
2638 | if (atomic_inc_return(&tracing_reader) != 1) { | |
2639 | atomic_dec(&tracing_reader); | |
2640 | return -EBUSY; | |
2641 | } | |
2642 | ||
2643 | /* create a buffer to store the information to pass to userspace */ | |
2644 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
2645 | if (!iter) | |
2646 | return -ENOMEM; | |
2647 | ||
107bad8b | 2648 | mutex_lock(&trace_types_lock); |
a309720c SR |
2649 | |
2650 | /* trace pipe does not show start of buffer */ | |
2651 | cpus_setall(iter->started); | |
2652 | ||
b3806b43 | 2653 | iter->tr = &global_trace; |
72829bc3 | 2654 | iter->trace = current_trace; |
b3806b43 SR |
2655 | filp->private_data = iter; |
2656 | ||
107bad8b SR |
2657 | if (iter->trace->pipe_open) |
2658 | iter->trace->pipe_open(iter); | |
2659 | mutex_unlock(&trace_types_lock); | |
2660 | ||
b3806b43 SR |
2661 | return 0; |
2662 | } | |
2663 | ||
2664 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
2665 | { | |
2666 | struct trace_iterator *iter = file->private_data; | |
2667 | ||
2668 | kfree(iter); | |
2669 | atomic_dec(&tracing_reader); | |
2670 | ||
2671 | return 0; | |
2672 | } | |
2673 | ||
2a2cc8f7 SSP |
2674 | static unsigned int |
2675 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) | |
2676 | { | |
2677 | struct trace_iterator *iter = filp->private_data; | |
2678 | ||
2679 | if (trace_flags & TRACE_ITER_BLOCK) { | |
2680 | /* | |
2681 | * Always select as readable when in blocking mode | |
2682 | */ | |
2683 | return POLLIN | POLLRDNORM; | |
afc2abc0 | 2684 | } else { |
2a2cc8f7 SSP |
2685 | if (!trace_empty(iter)) |
2686 | return POLLIN | POLLRDNORM; | |
2687 | poll_wait(filp, &trace_wait, poll_table); | |
2688 | if (!trace_empty(iter)) | |
2689 | return POLLIN | POLLRDNORM; | |
2690 | ||
2691 | return 0; | |
2692 | } | |
2693 | } | |
2694 | ||
b3806b43 SR |
2695 | /* |
2696 | * Consumer reader. | |
2697 | */ | |
2698 | static ssize_t | |
2699 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
2700 | size_t cnt, loff_t *ppos) | |
2701 | { | |
2702 | struct trace_iterator *iter = filp->private_data; | |
6c6c2796 | 2703 | ssize_t sret; |
b3806b43 SR |
2704 | |
2705 | /* return any leftover data */ | |
6c6c2796 PP |
2706 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
2707 | if (sret != -EBUSY) | |
2708 | return sret; | |
b3806b43 | 2709 | |
6c6c2796 | 2710 | trace_seq_reset(&iter->seq); |
b3806b43 | 2711 | |
107bad8b SR |
2712 | mutex_lock(&trace_types_lock); |
2713 | if (iter->trace->read) { | |
6c6c2796 PP |
2714 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); |
2715 | if (sret) | |
107bad8b | 2716 | goto out; |
107bad8b SR |
2717 | } |
2718 | ||
9ff4b974 PP |
2719 | waitagain: |
2720 | sret = 0; | |
b3806b43 | 2721 | while (trace_empty(iter)) { |
2dc8f095 | 2722 | |
107bad8b | 2723 | if ((filp->f_flags & O_NONBLOCK)) { |
6c6c2796 | 2724 | sret = -EAGAIN; |
107bad8b SR |
2725 | goto out; |
2726 | } | |
2dc8f095 | 2727 | |
b3806b43 SR |
2728 | /* |
2729 | * This is a make-shift waitqueue. The reason we don't use | |
2730 | * an actual wait queue is because: | |
2731 | * 1) we only ever have one waiter | |
2732 | * 2) the tracing, traces all functions, we don't want | |
2733 | * the overhead of calling wake_up and friends | |
2734 | * (and tracing them too) | |
2735 | * Anyway, this is really very primitive wakeup. | |
2736 | */ | |
2737 | set_current_state(TASK_INTERRUPTIBLE); | |
2738 | iter->tr->waiter = current; | |
2739 | ||
107bad8b SR |
2740 | mutex_unlock(&trace_types_lock); |
2741 | ||
9fe068e9 IM |
2742 | /* sleep for 100 msecs, and try again. */ |
2743 | schedule_timeout(HZ/10); | |
b3806b43 | 2744 | |
107bad8b SR |
2745 | mutex_lock(&trace_types_lock); |
2746 | ||
b3806b43 SR |
2747 | iter->tr->waiter = NULL; |
2748 | ||
107bad8b | 2749 | if (signal_pending(current)) { |
6c6c2796 | 2750 | sret = -EINTR; |
107bad8b SR |
2751 | goto out; |
2752 | } | |
b3806b43 | 2753 | |
84527997 | 2754 | if (iter->trace != current_trace) |
107bad8b | 2755 | goto out; |
84527997 | 2756 | |
b3806b43 SR |
2757 | /* |
2758 | * We block until we read something and tracing is disabled. | |
2759 | * We still block if tracing is disabled, but we have never | |
2760 | * read anything. This allows a user to cat this file, and | |
2761 | * then enable tracing. But after we have read something, | |
2762 | * we give an EOF when tracing is again disabled. | |
2763 | * | |
2764 | * iter->pos will be 0 if we haven't read anything. | |
2765 | */ | |
2766 | if (!tracer_enabled && iter->pos) | |
2767 | break; | |
2768 | ||
2769 | continue; | |
2770 | } | |
2771 | ||
2772 | /* stop when tracing is finished */ | |
2773 | if (trace_empty(iter)) | |
107bad8b | 2774 | goto out; |
b3806b43 SR |
2775 | |
2776 | if (cnt >= PAGE_SIZE) | |
2777 | cnt = PAGE_SIZE - 1; | |
2778 | ||
53d0aa77 | 2779 | /* reset all but tr, trace, and overruns */ |
53d0aa77 SR |
2780 | memset(&iter->seq, 0, |
2781 | sizeof(struct trace_iterator) - | |
2782 | offsetof(struct trace_iterator, seq)); | |
4823ed7e | 2783 | iter->pos = -1; |
b3806b43 | 2784 | |
088b1e42 | 2785 | while (find_next_entry_inc(iter) != NULL) { |
2c4f035f | 2786 | enum print_line_t ret; |
088b1e42 SR |
2787 | int len = iter->seq.len; |
2788 | ||
f9896bf3 | 2789 | ret = print_trace_line(iter); |
2c4f035f | 2790 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
088b1e42 SR |
2791 | /* don't print partial lines */ |
2792 | iter->seq.len = len; | |
b3806b43 | 2793 | break; |
088b1e42 | 2794 | } |
b3806b43 SR |
2795 | |
2796 | trace_consume(iter); | |
2797 | ||
2798 | if (iter->seq.len >= cnt) | |
2799 | break; | |
b3806b43 SR |
2800 | } |
2801 | ||
b3806b43 | 2802 | /* Now copy what we have to the user */ |
6c6c2796 PP |
2803 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
2804 | if (iter->seq.readpos >= iter->seq.len) | |
b3806b43 | 2805 | trace_seq_reset(&iter->seq); |
9ff4b974 PP |
2806 | |
2807 | /* | |
2808 | * If there was nothing to send to user, inspite of consuming trace | |
2809 | * entries, go back to wait for more entries. | |
2810 | */ | |
6c6c2796 | 2811 | if (sret == -EBUSY) |
9ff4b974 | 2812 | goto waitagain; |
b3806b43 | 2813 | |
107bad8b SR |
2814 | out: |
2815 | mutex_unlock(&trace_types_lock); | |
2816 | ||
6c6c2796 | 2817 | return sret; |
b3806b43 SR |
2818 | } |
2819 | ||
a98a3c3f SR |
2820 | static ssize_t |
2821 | tracing_entries_read(struct file *filp, char __user *ubuf, | |
2822 | size_t cnt, loff_t *ppos) | |
2823 | { | |
2824 | struct trace_array *tr = filp->private_data; | |
2825 | char buf[64]; | |
2826 | int r; | |
2827 | ||
2828 | r = sprintf(buf, "%lu\n", tr->entries); | |
2829 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
2830 | } | |
2831 | ||
2832 | static ssize_t | |
2833 | tracing_entries_write(struct file *filp, const char __user *ubuf, | |
2834 | size_t cnt, loff_t *ppos) | |
2835 | { | |
2836 | unsigned long val; | |
2837 | char buf[64]; | |
bf5e6519 | 2838 | int ret, cpu; |
a98a3c3f | 2839 | |
cffae437 SR |
2840 | if (cnt >= sizeof(buf)) |
2841 | return -EINVAL; | |
a98a3c3f SR |
2842 | |
2843 | if (copy_from_user(&buf, ubuf, cnt)) | |
2844 | return -EFAULT; | |
2845 | ||
2846 | buf[cnt] = 0; | |
2847 | ||
c6caeeb1 SR |
2848 | ret = strict_strtoul(buf, 10, &val); |
2849 | if (ret < 0) | |
2850 | return ret; | |
a98a3c3f SR |
2851 | |
2852 | /* must have at least 1 entry */ | |
2853 | if (!val) | |
2854 | return -EINVAL; | |
2855 | ||
2856 | mutex_lock(&trace_types_lock); | |
2857 | ||
c76f0694 | 2858 | tracing_stop(); |
a98a3c3f | 2859 | |
bf5e6519 SR |
2860 | /* disable all cpu buffers */ |
2861 | for_each_tracing_cpu(cpu) { | |
2862 | if (global_trace.data[cpu]) | |
2863 | atomic_inc(&global_trace.data[cpu]->disabled); | |
2864 | if (max_tr.data[cpu]) | |
2865 | atomic_inc(&max_tr.data[cpu]->disabled); | |
2866 | } | |
2867 | ||
3928a8a2 SR |
2868 | if (val != global_trace.entries) { |
2869 | ret = ring_buffer_resize(global_trace.buffer, val); | |
2870 | if (ret < 0) { | |
2871 | cnt = ret; | |
3eefae99 SR |
2872 | goto out; |
2873 | } | |
2874 | ||
3928a8a2 SR |
2875 | ret = ring_buffer_resize(max_tr.buffer, val); |
2876 | if (ret < 0) { | |
2877 | int r; | |
2878 | cnt = ret; | |
2879 | r = ring_buffer_resize(global_trace.buffer, | |
2880 | global_trace.entries); | |
2881 | if (r < 0) { | |
2882 | /* AARGH! We are left with different | |
2883 | * size max buffer!!!! */ | |
2884 | WARN_ON(1); | |
2885 | tracing_disabled = 1; | |
a98a3c3f | 2886 | } |
3928a8a2 | 2887 | goto out; |
a98a3c3f | 2888 | } |
3eefae99 | 2889 | |
3928a8a2 | 2890 | global_trace.entries = val; |
a98a3c3f SR |
2891 | } |
2892 | ||
2893 | filp->f_pos += cnt; | |
2894 | ||
19384c03 SR |
2895 | /* If check pages failed, return ENOMEM */ |
2896 | if (tracing_disabled) | |
2897 | cnt = -ENOMEM; | |
a98a3c3f | 2898 | out: |
bf5e6519 SR |
2899 | for_each_tracing_cpu(cpu) { |
2900 | if (global_trace.data[cpu]) | |
2901 | atomic_dec(&global_trace.data[cpu]->disabled); | |
2902 | if (max_tr.data[cpu]) | |
2903 | atomic_dec(&max_tr.data[cpu]->disabled); | |
2904 | } | |
2905 | ||
c76f0694 | 2906 | tracing_start(); |
a98a3c3f SR |
2907 | max_tr.entries = global_trace.entries; |
2908 | mutex_unlock(&trace_types_lock); | |
2909 | ||
2910 | return cnt; | |
2911 | } | |
2912 | ||
5bf9a1ee PP |
2913 | static int mark_printk(const char *fmt, ...) |
2914 | { | |
2915 | int ret; | |
2916 | va_list args; | |
2917 | va_start(args, fmt); | |
2918 | ret = trace_vprintk(0, fmt, args); | |
2919 | va_end(args); | |
2920 | return ret; | |
2921 | } | |
2922 | ||
2923 | static ssize_t | |
2924 | tracing_mark_write(struct file *filp, const char __user *ubuf, | |
2925 | size_t cnt, loff_t *fpos) | |
2926 | { | |
2927 | char *buf; | |
2928 | char *end; | |
5bf9a1ee | 2929 | |
c76f0694 | 2930 | if (tracing_disabled) |
5bf9a1ee PP |
2931 | return -EINVAL; |
2932 | ||
2933 | if (cnt > TRACE_BUF_SIZE) | |
2934 | cnt = TRACE_BUF_SIZE; | |
2935 | ||
2936 | buf = kmalloc(cnt + 1, GFP_KERNEL); | |
2937 | if (buf == NULL) | |
2938 | return -ENOMEM; | |
2939 | ||
2940 | if (copy_from_user(buf, ubuf, cnt)) { | |
2941 | kfree(buf); | |
2942 | return -EFAULT; | |
2943 | } | |
2944 | ||
2945 | /* Cut from the first nil or newline. */ | |
2946 | buf[cnt] = '\0'; | |
2947 | end = strchr(buf, '\n'); | |
2948 | if (end) | |
2949 | *end = '\0'; | |
2950 | ||
2951 | cnt = mark_printk("%s\n", buf); | |
2952 | kfree(buf); | |
2953 | *fpos += cnt; | |
2954 | ||
2955 | return cnt; | |
2956 | } | |
2957 | ||
bc0c38d1 | 2958 | static struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
2959 | .open = tracing_open_generic, |
2960 | .read = tracing_max_lat_read, | |
2961 | .write = tracing_max_lat_write, | |
bc0c38d1 SR |
2962 | }; |
2963 | ||
2964 | static struct file_operations tracing_ctrl_fops = { | |
4bf39a94 IM |
2965 | .open = tracing_open_generic, |
2966 | .read = tracing_ctrl_read, | |
2967 | .write = tracing_ctrl_write, | |
bc0c38d1 SR |
2968 | }; |
2969 | ||
2970 | static struct file_operations set_tracer_fops = { | |
4bf39a94 IM |
2971 | .open = tracing_open_generic, |
2972 | .read = tracing_set_trace_read, | |
2973 | .write = tracing_set_trace_write, | |
bc0c38d1 SR |
2974 | }; |
2975 | ||
b3806b43 | 2976 | static struct file_operations tracing_pipe_fops = { |
4bf39a94 | 2977 | .open = tracing_open_pipe, |
2a2cc8f7 | 2978 | .poll = tracing_poll_pipe, |
4bf39a94 IM |
2979 | .read = tracing_read_pipe, |
2980 | .release = tracing_release_pipe, | |
b3806b43 SR |
2981 | }; |
2982 | ||
a98a3c3f SR |
2983 | static struct file_operations tracing_entries_fops = { |
2984 | .open = tracing_open_generic, | |
2985 | .read = tracing_entries_read, | |
2986 | .write = tracing_entries_write, | |
2987 | }; | |
2988 | ||
5bf9a1ee | 2989 | static struct file_operations tracing_mark_fops = { |
43a15386 | 2990 | .open = tracing_open_generic, |
5bf9a1ee PP |
2991 | .write = tracing_mark_write, |
2992 | }; | |
2993 | ||
bc0c38d1 SR |
2994 | #ifdef CONFIG_DYNAMIC_FTRACE |
2995 | ||
b807c3d0 SR |
2996 | int __weak ftrace_arch_read_dyn_info(char *buf, int size) |
2997 | { | |
2998 | return 0; | |
2999 | } | |
3000 | ||
bc0c38d1 | 3001 | static ssize_t |
b807c3d0 | 3002 | tracing_read_dyn_info(struct file *filp, char __user *ubuf, |
bc0c38d1 SR |
3003 | size_t cnt, loff_t *ppos) |
3004 | { | |
a26a2a27 SR |
3005 | static char ftrace_dyn_info_buffer[1024]; |
3006 | static DEFINE_MUTEX(dyn_info_mutex); | |
bc0c38d1 | 3007 | unsigned long *p = filp->private_data; |
b807c3d0 | 3008 | char *buf = ftrace_dyn_info_buffer; |
a26a2a27 | 3009 | int size = ARRAY_SIZE(ftrace_dyn_info_buffer); |
bc0c38d1 SR |
3010 | int r; |
3011 | ||
b807c3d0 SR |
3012 | mutex_lock(&dyn_info_mutex); |
3013 | r = sprintf(buf, "%ld ", *p); | |
4bf39a94 | 3014 | |
a26a2a27 | 3015 | r += ftrace_arch_read_dyn_info(buf+r, (size-1)-r); |
b807c3d0 SR |
3016 | buf[r++] = '\n'; |
3017 | ||
3018 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
3019 | ||
3020 | mutex_unlock(&dyn_info_mutex); | |
3021 | ||
3022 | return r; | |
bc0c38d1 SR |
3023 | } |
3024 | ||
b807c3d0 | 3025 | static struct file_operations tracing_dyn_info_fops = { |
4bf39a94 | 3026 | .open = tracing_open_generic, |
b807c3d0 | 3027 | .read = tracing_read_dyn_info, |
bc0c38d1 SR |
3028 | }; |
3029 | #endif | |
3030 | ||
3031 | static struct dentry *d_tracer; | |
3032 | ||
3033 | struct dentry *tracing_init_dentry(void) | |
3034 | { | |
3035 | static int once; | |
3036 | ||
3037 | if (d_tracer) | |
3038 | return d_tracer; | |
3039 | ||
3040 | d_tracer = debugfs_create_dir("tracing", NULL); | |
3041 | ||
3042 | if (!d_tracer && !once) { | |
3043 | once = 1; | |
3044 | pr_warning("Could not create debugfs directory 'tracing'\n"); | |
3045 | return NULL; | |
3046 | } | |
3047 | ||
3048 | return d_tracer; | |
3049 | } | |
3050 | ||
60a11774 SR |
3051 | #ifdef CONFIG_FTRACE_SELFTEST |
3052 | /* Let selftest have access to static functions in this file */ | |
3053 | #include "trace_selftest.c" | |
3054 | #endif | |
3055 | ||
b5ad384e | 3056 | static __init int tracer_init_debugfs(void) |
bc0c38d1 SR |
3057 | { |
3058 | struct dentry *d_tracer; | |
3059 | struct dentry *entry; | |
3060 | ||
3061 | d_tracer = tracing_init_dentry(); | |
3062 | ||
3063 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, | |
3064 | &global_trace, &tracing_ctrl_fops); | |
3065 | if (!entry) | |
3066 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); | |
3067 | ||
3068 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, | |
3069 | NULL, &tracing_iter_fops); | |
3070 | if (!entry) | |
3071 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); | |
3072 | ||
c7078de1 IM |
3073 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
3074 | NULL, &tracing_cpumask_fops); | |
3075 | if (!entry) | |
3076 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); | |
3077 | ||
bc0c38d1 SR |
3078 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
3079 | &global_trace, &tracing_lt_fops); | |
3080 | if (!entry) | |
3081 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); | |
3082 | ||
3083 | entry = debugfs_create_file("trace", 0444, d_tracer, | |
3084 | &global_trace, &tracing_fops); | |
3085 | if (!entry) | |
3086 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
3087 | ||
3088 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, | |
3089 | &global_trace, &show_traces_fops); | |
3090 | if (!entry) | |
98a983aa | 3091 | pr_warning("Could not create debugfs 'available_tracers' entry\n"); |
bc0c38d1 SR |
3092 | |
3093 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, | |
3094 | &global_trace, &set_tracer_fops); | |
3095 | if (!entry) | |
98a983aa | 3096 | pr_warning("Could not create debugfs 'current_tracer' entry\n"); |
bc0c38d1 SR |
3097 | |
3098 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, | |
3099 | &tracing_max_latency, | |
3100 | &tracing_max_lat_fops); | |
3101 | if (!entry) | |
3102 | pr_warning("Could not create debugfs " | |
3103 | "'tracing_max_latency' entry\n"); | |
3104 | ||
3105 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, | |
3106 | &tracing_thresh, &tracing_max_lat_fops); | |
3107 | if (!entry) | |
3108 | pr_warning("Could not create debugfs " | |
98a983aa | 3109 | "'tracing_thresh' entry\n"); |
7bd2f24c IM |
3110 | entry = debugfs_create_file("README", 0644, d_tracer, |
3111 | NULL, &tracing_readme_fops); | |
3112 | if (!entry) | |
3113 | pr_warning("Could not create debugfs 'README' entry\n"); | |
3114 | ||
b3806b43 SR |
3115 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
3116 | NULL, &tracing_pipe_fops); | |
3117 | if (!entry) | |
3118 | pr_warning("Could not create debugfs " | |
98a983aa | 3119 | "'trace_pipe' entry\n"); |
bc0c38d1 | 3120 | |
a98a3c3f SR |
3121 | entry = debugfs_create_file("trace_entries", 0644, d_tracer, |
3122 | &global_trace, &tracing_entries_fops); | |
3123 | if (!entry) | |
3124 | pr_warning("Could not create debugfs " | |
98a983aa | 3125 | "'trace_entries' entry\n"); |
a98a3c3f | 3126 | |
5bf9a1ee PP |
3127 | entry = debugfs_create_file("trace_marker", 0220, d_tracer, |
3128 | NULL, &tracing_mark_fops); | |
3129 | if (!entry) | |
3130 | pr_warning("Could not create debugfs " | |
3131 | "'trace_marker' entry\n"); | |
3132 | ||
bc0c38d1 SR |
3133 | #ifdef CONFIG_DYNAMIC_FTRACE |
3134 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, | |
3135 | &ftrace_update_tot_cnt, | |
b807c3d0 | 3136 | &tracing_dyn_info_fops); |
bc0c38d1 SR |
3137 | if (!entry) |
3138 | pr_warning("Could not create debugfs " | |
3139 | "'dyn_ftrace_total_info' entry\n"); | |
3140 | #endif | |
d618b3e6 IM |
3141 | #ifdef CONFIG_SYSPROF_TRACER |
3142 | init_tracer_sysprof_debugfs(d_tracer); | |
3143 | #endif | |
b5ad384e | 3144 | return 0; |
bc0c38d1 SR |
3145 | } |
3146 | ||
801fe400 | 3147 | int trace_vprintk(unsigned long ip, const char *fmt, va_list args) |
dd0e545f | 3148 | { |
dd0e545f SR |
3149 | static DEFINE_SPINLOCK(trace_buf_lock); |
3150 | static char trace_buf[TRACE_BUF_SIZE]; | |
f09ce573 | 3151 | |
3928a8a2 | 3152 | struct ring_buffer_event *event; |
f09ce573 | 3153 | struct trace_array *tr = &global_trace; |
dd0e545f | 3154 | struct trace_array_cpu *data; |
777e208d | 3155 | struct print_entry *entry; |
3928a8a2 | 3156 | unsigned long flags, irq_flags; |
38697053 | 3157 | int cpu, len = 0, size, pc; |
dd0e545f | 3158 | |
c76f0694 | 3159 | if (tracing_disabled) |
dd0e545f SR |
3160 | return 0; |
3161 | ||
38697053 SR |
3162 | pc = preempt_count(); |
3163 | preempt_disable_notrace(); | |
dd0e545f SR |
3164 | cpu = raw_smp_processor_id(); |
3165 | data = tr->data[cpu]; | |
dd0e545f | 3166 | |
3ea2e6d7 | 3167 | if (unlikely(atomic_read(&data->disabled))) |
dd0e545f SR |
3168 | goto out; |
3169 | ||
38697053 | 3170 | spin_lock_irqsave(&trace_buf_lock, flags); |
801fe400 | 3171 | len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args); |
dd0e545f SR |
3172 | |
3173 | len = min(len, TRACE_BUF_SIZE-1); | |
3174 | trace_buf[len] = 0; | |
3175 | ||
777e208d SR |
3176 | size = sizeof(*entry) + len + 1; |
3177 | event = ring_buffer_lock_reserve(tr->buffer, size, &irq_flags); | |
3928a8a2 SR |
3178 | if (!event) |
3179 | goto out_unlock; | |
777e208d | 3180 | entry = ring_buffer_event_data(event); |
38697053 | 3181 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
3182 | entry->ent.type = TRACE_PRINT; |
3183 | entry->ip = ip; | |
dd0e545f | 3184 | |
777e208d SR |
3185 | memcpy(&entry->buf, trace_buf, len); |
3186 | entry->buf[len] = 0; | |
3928a8a2 | 3187 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
dd0e545f | 3188 | |
3928a8a2 | 3189 | out_unlock: |
38697053 | 3190 | spin_unlock_irqrestore(&trace_buf_lock, flags); |
dd0e545f SR |
3191 | |
3192 | out: | |
38697053 | 3193 | preempt_enable_notrace(); |
dd0e545f SR |
3194 | |
3195 | return len; | |
3196 | } | |
801fe400 PP |
3197 | EXPORT_SYMBOL_GPL(trace_vprintk); |
3198 | ||
3199 | int __ftrace_printk(unsigned long ip, const char *fmt, ...) | |
3200 | { | |
3201 | int ret; | |
3202 | va_list ap; | |
3203 | ||
3204 | if (!(trace_flags & TRACE_ITER_PRINTK)) | |
3205 | return 0; | |
3206 | ||
3207 | va_start(ap, fmt); | |
3208 | ret = trace_vprintk(ip, fmt, ap); | |
3209 | va_end(ap); | |
3210 | return ret; | |
3211 | } | |
dd0e545f SR |
3212 | EXPORT_SYMBOL_GPL(__ftrace_printk); |
3213 | ||
3f5a54e3 SR |
3214 | static int trace_panic_handler(struct notifier_block *this, |
3215 | unsigned long event, void *unused) | |
3216 | { | |
944ac425 SR |
3217 | if (ftrace_dump_on_oops) |
3218 | ftrace_dump(); | |
3f5a54e3 SR |
3219 | return NOTIFY_OK; |
3220 | } | |
3221 | ||
3222 | static struct notifier_block trace_panic_notifier = { | |
3223 | .notifier_call = trace_panic_handler, | |
3224 | .next = NULL, | |
3225 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ | |
3226 | }; | |
3227 | ||
3228 | static int trace_die_handler(struct notifier_block *self, | |
3229 | unsigned long val, | |
3230 | void *data) | |
3231 | { | |
3232 | switch (val) { | |
3233 | case DIE_OOPS: | |
944ac425 SR |
3234 | if (ftrace_dump_on_oops) |
3235 | ftrace_dump(); | |
3f5a54e3 SR |
3236 | break; |
3237 | default: | |
3238 | break; | |
3239 | } | |
3240 | return NOTIFY_OK; | |
3241 | } | |
3242 | ||
3243 | static struct notifier_block trace_die_notifier = { | |
3244 | .notifier_call = trace_die_handler, | |
3245 | .priority = 200 | |
3246 | }; | |
3247 | ||
3248 | /* | |
3249 | * printk is set to max of 1024, we really don't need it that big. | |
3250 | * Nothing should be printing 1000 characters anyway. | |
3251 | */ | |
3252 | #define TRACE_MAX_PRINT 1000 | |
3253 | ||
3254 | /* | |
3255 | * Define here KERN_TRACE so that we have one place to modify | |
3256 | * it if we decide to change what log level the ftrace dump | |
3257 | * should be at. | |
3258 | */ | |
3259 | #define KERN_TRACE KERN_INFO | |
3260 | ||
3261 | static void | |
3262 | trace_printk_seq(struct trace_seq *s) | |
3263 | { | |
3264 | /* Probably should print a warning here. */ | |
3265 | if (s->len >= 1000) | |
3266 | s->len = 1000; | |
3267 | ||
3268 | /* should be zero ended, but we are paranoid. */ | |
3269 | s->buffer[s->len] = 0; | |
3270 | ||
3271 | printk(KERN_TRACE "%s", s->buffer); | |
3272 | ||
3273 | trace_seq_reset(s); | |
3274 | } | |
3275 | ||
3f5a54e3 SR |
3276 | void ftrace_dump(void) |
3277 | { | |
3278 | static DEFINE_SPINLOCK(ftrace_dump_lock); | |
3279 | /* use static because iter can be a bit big for the stack */ | |
3280 | static struct trace_iterator iter; | |
3f5a54e3 SR |
3281 | static cpumask_t mask; |
3282 | static int dump_ran; | |
d769041f SR |
3283 | unsigned long flags; |
3284 | int cnt = 0, cpu; | |
3f5a54e3 SR |
3285 | |
3286 | /* only one dump */ | |
3287 | spin_lock_irqsave(&ftrace_dump_lock, flags); | |
3288 | if (dump_ran) | |
3289 | goto out; | |
3290 | ||
3291 | dump_ran = 1; | |
3292 | ||
3293 | /* No turning back! */ | |
81adbdc0 | 3294 | ftrace_kill(); |
3f5a54e3 | 3295 | |
d769041f SR |
3296 | for_each_tracing_cpu(cpu) { |
3297 | atomic_inc(&global_trace.data[cpu]->disabled); | |
3298 | } | |
3299 | ||
3f5a54e3 SR |
3300 | printk(KERN_TRACE "Dumping ftrace buffer:\n"); |
3301 | ||
3302 | iter.tr = &global_trace; | |
3303 | iter.trace = current_trace; | |
3304 | ||
3305 | /* | |
3306 | * We need to stop all tracing on all CPUS to read the | |
3307 | * the next buffer. This is a bit expensive, but is | |
3308 | * not done often. We fill all what we can read, | |
3309 | * and then release the locks again. | |
3310 | */ | |
3311 | ||
3312 | cpus_clear(mask); | |
3313 | ||
3f5a54e3 SR |
3314 | while (!trace_empty(&iter)) { |
3315 | ||
3316 | if (!cnt) | |
3317 | printk(KERN_TRACE "---------------------------------\n"); | |
3318 | ||
3319 | cnt++; | |
3320 | ||
3321 | /* reset all but tr, trace, and overruns */ | |
3322 | memset(&iter.seq, 0, | |
3323 | sizeof(struct trace_iterator) - | |
3324 | offsetof(struct trace_iterator, seq)); | |
3325 | iter.iter_flags |= TRACE_FILE_LAT_FMT; | |
3326 | iter.pos = -1; | |
3327 | ||
3328 | if (find_next_entry_inc(&iter) != NULL) { | |
3329 | print_trace_line(&iter); | |
3330 | trace_consume(&iter); | |
3331 | } | |
3332 | ||
3333 | trace_printk_seq(&iter.seq); | |
3334 | } | |
3335 | ||
3336 | if (!cnt) | |
3337 | printk(KERN_TRACE " (ftrace buffer empty)\n"); | |
3338 | else | |
3339 | printk(KERN_TRACE "---------------------------------\n"); | |
3340 | ||
3f5a54e3 SR |
3341 | out: |
3342 | spin_unlock_irqrestore(&ftrace_dump_lock, flags); | |
3343 | } | |
3344 | ||
3928a8a2 | 3345 | __init static int tracer_alloc_buffers(void) |
bc0c38d1 | 3346 | { |
4c11d7ae | 3347 | struct trace_array_cpu *data; |
4c11d7ae SR |
3348 | int i; |
3349 | ||
3928a8a2 SR |
3350 | /* TODO: make the number of buffers hot pluggable with CPUS */ |
3351 | tracing_buffer_mask = cpu_possible_map; | |
4c11d7ae | 3352 | |
3928a8a2 SR |
3353 | global_trace.buffer = ring_buffer_alloc(trace_buf_size, |
3354 | TRACE_BUFFER_FLAGS); | |
3355 | if (!global_trace.buffer) { | |
3356 | printk(KERN_ERR "tracer: failed to allocate ring buffer!\n"); | |
3357 | WARN_ON(1); | |
3358 | return 0; | |
4c11d7ae | 3359 | } |
3928a8a2 | 3360 | global_trace.entries = ring_buffer_size(global_trace.buffer); |
4c11d7ae SR |
3361 | |
3362 | #ifdef CONFIG_TRACER_MAX_TRACE | |
3928a8a2 SR |
3363 | max_tr.buffer = ring_buffer_alloc(trace_buf_size, |
3364 | TRACE_BUFFER_FLAGS); | |
3365 | if (!max_tr.buffer) { | |
3366 | printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n"); | |
3367 | WARN_ON(1); | |
3368 | ring_buffer_free(global_trace.buffer); | |
3369 | return 0; | |
4c11d7ae | 3370 | } |
3928a8a2 SR |
3371 | max_tr.entries = ring_buffer_size(max_tr.buffer); |
3372 | WARN_ON(max_tr.entries != global_trace.entries); | |
a98a3c3f | 3373 | #endif |
ab46428c | 3374 | |
4c11d7ae | 3375 | /* Allocate the first page for all buffers */ |
ab46428c | 3376 | for_each_tracing_cpu(i) { |
4c11d7ae | 3377 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
bc0c38d1 | 3378 | max_tr.data[i] = &per_cpu(max_data, i); |
4c11d7ae | 3379 | } |
bc0c38d1 | 3380 | |
bc0c38d1 SR |
3381 | trace_init_cmdlines(); |
3382 | ||
43a15386 | 3383 | register_tracer(&nop_trace); |
b5ad384e FW |
3384 | #ifdef CONFIG_BOOT_TRACER |
3385 | register_tracer(&boot_tracer); | |
3386 | current_trace = &boot_tracer; | |
3387 | current_trace->init(&global_trace); | |
3388 | #else | |
43a15386 | 3389 | current_trace = &nop_trace; |
b5ad384e | 3390 | #endif |
bc0c38d1 | 3391 | |
60a11774 SR |
3392 | /* All seems OK, enable tracing */ |
3393 | tracing_disabled = 0; | |
3928a8a2 | 3394 | |
3f5a54e3 SR |
3395 | atomic_notifier_chain_register(&panic_notifier_list, |
3396 | &trace_panic_notifier); | |
3397 | ||
3398 | register_die_notifier(&trace_die_notifier); | |
3399 | ||
bc0c38d1 | 3400 | return 0; |
bc0c38d1 | 3401 | } |
b5ad384e FW |
3402 | early_initcall(tracer_alloc_buffers); |
3403 | fs_initcall(tracer_init_debugfs); |