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Commit | Line | Data |
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bc0c38d1 SR |
1 | /* |
2 | * ring buffer based function tracer | |
3 | * | |
4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> | |
5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> | |
6 | * | |
7 | * Originally taken from the RT patch by: | |
8 | * Arnaldo Carvalho de Melo <acme@redhat.com> | |
9 | * | |
10 | * Based on code from the latency_tracer, that is: | |
11 | * Copyright (C) 2004-2006 Ingo Molnar | |
12 | * Copyright (C) 2004 William Lee Irwin III | |
13 | */ | |
14 | #include <linux/utsrelease.h> | |
15 | #include <linux/kallsyms.h> | |
16 | #include <linux/seq_file.h> | |
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 | 247 | /* These must match the bit postions in trace_iterator_flags */ |
bc0c38d1 SR |
248 | static const char *trace_options[] = { |
249 | "print-parent", | |
250 | "sym-offset", | |
251 | "sym-addr", | |
252 | "verbose", | |
f9896bf3 | 253 | "raw", |
5e3ca0ec | 254 | "hex", |
cb0f12aa | 255 | "bin", |
2a2cc8f7 | 256 | "block", |
86387f7e | 257 | "stacktrace", |
4ac3ba41 | 258 | "sched-tree", |
f09ce573 | 259 | "ftrace_printk", |
b2a866f9 | 260 | "ftrace_preempt", |
bc0c38d1 SR |
261 | NULL |
262 | }; | |
263 | ||
4fcdae83 SR |
264 | /* |
265 | * ftrace_max_lock is used to protect the swapping of buffers | |
266 | * when taking a max snapshot. The buffers themselves are | |
267 | * protected by per_cpu spinlocks. But the action of the swap | |
268 | * needs its own lock. | |
269 | * | |
270 | * This is defined as a raw_spinlock_t in order to help | |
271 | * with performance when lockdep debugging is enabled. | |
272 | */ | |
92205c23 SR |
273 | static raw_spinlock_t ftrace_max_lock = |
274 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; | |
bc0c38d1 SR |
275 | |
276 | /* | |
277 | * Copy the new maximum trace into the separate maximum-trace | |
278 | * structure. (this way the maximum trace is permanently saved, | |
279 | * for later retrieval via /debugfs/tracing/latency_trace) | |
280 | */ | |
e309b41d | 281 | static void |
bc0c38d1 SR |
282 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
283 | { | |
284 | struct trace_array_cpu *data = tr->data[cpu]; | |
285 | ||
286 | max_tr.cpu = cpu; | |
287 | max_tr.time_start = data->preempt_timestamp; | |
288 | ||
289 | data = max_tr.data[cpu]; | |
290 | data->saved_latency = tracing_max_latency; | |
291 | ||
292 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); | |
293 | data->pid = tsk->pid; | |
294 | data->uid = tsk->uid; | |
295 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; | |
296 | data->policy = tsk->policy; | |
297 | data->rt_priority = tsk->rt_priority; | |
298 | ||
299 | /* record this tasks comm */ | |
300 | tracing_record_cmdline(current); | |
301 | } | |
302 | ||
4fcdae83 SR |
303 | /** |
304 | * trace_seq_printf - sequence printing of trace information | |
305 | * @s: trace sequence descriptor | |
306 | * @fmt: printf format string | |
307 | * | |
308 | * The tracer may use either sequence operations or its own | |
309 | * copy to user routines. To simplify formating of a trace | |
310 | * trace_seq_printf is used to store strings into a special | |
311 | * buffer (@s). Then the output may be either used by | |
312 | * the sequencer or pulled into another buffer. | |
313 | */ | |
72829bc3 | 314 | int |
214023c3 SR |
315 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
316 | { | |
317 | int len = (PAGE_SIZE - 1) - s->len; | |
318 | va_list ap; | |
b3806b43 | 319 | int ret; |
214023c3 SR |
320 | |
321 | if (!len) | |
322 | return 0; | |
323 | ||
324 | va_start(ap, fmt); | |
b3806b43 | 325 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
214023c3 SR |
326 | va_end(ap); |
327 | ||
b3806b43 | 328 | /* If we can't write it all, don't bother writing anything */ |
72829bc3 | 329 | if (ret >= len) |
b3806b43 SR |
330 | return 0; |
331 | ||
332 | s->len += ret; | |
214023c3 SR |
333 | |
334 | return len; | |
335 | } | |
336 | ||
4fcdae83 SR |
337 | /** |
338 | * trace_seq_puts - trace sequence printing of simple string | |
339 | * @s: trace sequence descriptor | |
340 | * @str: simple string to record | |
341 | * | |
342 | * The tracer may use either the sequence operations or its own | |
343 | * copy to user routines. This function records a simple string | |
344 | * into a special buffer (@s) for later retrieval by a sequencer | |
345 | * or other mechanism. | |
346 | */ | |
e309b41d | 347 | static int |
214023c3 SR |
348 | trace_seq_puts(struct trace_seq *s, const char *str) |
349 | { | |
350 | int len = strlen(str); | |
351 | ||
352 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
b3806b43 | 353 | return 0; |
214023c3 SR |
354 | |
355 | memcpy(s->buffer + s->len, str, len); | |
356 | s->len += len; | |
357 | ||
358 | return len; | |
359 | } | |
360 | ||
e309b41d | 361 | static int |
214023c3 SR |
362 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
363 | { | |
364 | if (s->len >= (PAGE_SIZE - 1)) | |
365 | return 0; | |
366 | ||
367 | s->buffer[s->len++] = c; | |
368 | ||
369 | return 1; | |
370 | } | |
371 | ||
e309b41d | 372 | static int |
cb0f12aa IM |
373 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
374 | { | |
375 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
376 | return 0; | |
377 | ||
378 | memcpy(s->buffer + s->len, mem, len); | |
379 | s->len += len; | |
380 | ||
381 | return len; | |
382 | } | |
383 | ||
ad0a3b68 HH |
384 | #define MAX_MEMHEX_BYTES 8 |
385 | #define HEX_CHARS (MAX_MEMHEX_BYTES*2 + 1) | |
5e3ca0ec | 386 | |
e309b41d | 387 | static int |
5e3ca0ec IM |
388 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
389 | { | |
390 | unsigned char hex[HEX_CHARS]; | |
93dcc6ea | 391 | unsigned char *data = mem; |
5e3ca0ec IM |
392 | int i, j; |
393 | ||
5e3ca0ec IM |
394 | #ifdef __BIG_ENDIAN |
395 | for (i = 0, j = 0; i < len; i++) { | |
396 | #else | |
397 | for (i = len-1, j = 0; i >= 0; i--) { | |
398 | #endif | |
2fbc4749 HH |
399 | hex[j++] = hex_asc_hi(data[i]); |
400 | hex[j++] = hex_asc_lo(data[i]); | |
5e3ca0ec | 401 | } |
93dcc6ea | 402 | hex[j++] = ' '; |
5e3ca0ec IM |
403 | |
404 | return trace_seq_putmem(s, hex, j); | |
405 | } | |
406 | ||
e309b41d | 407 | static void |
214023c3 SR |
408 | trace_seq_reset(struct trace_seq *s) |
409 | { | |
410 | s->len = 0; | |
6c6c2796 PP |
411 | s->readpos = 0; |
412 | } | |
413 | ||
414 | ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) | |
415 | { | |
416 | int len; | |
417 | int ret; | |
418 | ||
419 | if (s->len <= s->readpos) | |
420 | return -EBUSY; | |
421 | ||
422 | len = s->len - s->readpos; | |
423 | if (cnt > len) | |
424 | cnt = len; | |
425 | ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); | |
426 | if (ret) | |
427 | return -EFAULT; | |
428 | ||
429 | s->readpos += len; | |
430 | return cnt; | |
214023c3 SR |
431 | } |
432 | ||
e309b41d | 433 | static void |
214023c3 SR |
434 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
435 | { | |
436 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; | |
437 | ||
438 | s->buffer[len] = 0; | |
439 | seq_puts(m, s->buffer); | |
440 | ||
441 | trace_seq_reset(s); | |
442 | } | |
443 | ||
4fcdae83 SR |
444 | /** |
445 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr | |
446 | * @tr: tracer | |
447 | * @tsk: the task with the latency | |
448 | * @cpu: The cpu that initiated the trace. | |
449 | * | |
450 | * Flip the buffers between the @tr and the max_tr and record information | |
451 | * about which task was the cause of this latency. | |
452 | */ | |
e309b41d | 453 | void |
bc0c38d1 SR |
454 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
455 | { | |
3928a8a2 | 456 | struct ring_buffer *buf = tr->buffer; |
bc0c38d1 | 457 | |
4c11d7ae | 458 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 459 | __raw_spin_lock(&ftrace_max_lock); |
3928a8a2 SR |
460 | |
461 | tr->buffer = max_tr.buffer; | |
462 | max_tr.buffer = buf; | |
463 | ||
d769041f | 464 | ftrace_disable_cpu(); |
3928a8a2 | 465 | ring_buffer_reset(tr->buffer); |
d769041f | 466 | ftrace_enable_cpu(); |
bc0c38d1 SR |
467 | |
468 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 469 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
470 | } |
471 | ||
472 | /** | |
473 | * update_max_tr_single - only copy one trace over, and reset the rest | |
474 | * @tr - tracer | |
475 | * @tsk - task with the latency | |
476 | * @cpu - the cpu of the buffer to copy. | |
4fcdae83 SR |
477 | * |
478 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. | |
bc0c38d1 | 479 | */ |
e309b41d | 480 | void |
bc0c38d1 SR |
481 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
482 | { | |
3928a8a2 | 483 | int ret; |
bc0c38d1 | 484 | |
4c11d7ae | 485 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 486 | __raw_spin_lock(&ftrace_max_lock); |
bc0c38d1 | 487 | |
d769041f SR |
488 | ftrace_disable_cpu(); |
489 | ||
3928a8a2 SR |
490 | ring_buffer_reset(max_tr.buffer); |
491 | ret = ring_buffer_swap_cpu(max_tr.buffer, tr->buffer, cpu); | |
492 | ||
d769041f SR |
493 | ftrace_enable_cpu(); |
494 | ||
3928a8a2 | 495 | WARN_ON_ONCE(ret); |
bc0c38d1 SR |
496 | |
497 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 498 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
499 | } |
500 | ||
4fcdae83 SR |
501 | /** |
502 | * register_tracer - register a tracer with the ftrace system. | |
503 | * @type - the plugin for the tracer | |
504 | * | |
505 | * Register a new plugin tracer. | |
506 | */ | |
bc0c38d1 SR |
507 | int register_tracer(struct tracer *type) |
508 | { | |
509 | struct tracer *t; | |
510 | int len; | |
511 | int ret = 0; | |
512 | ||
513 | if (!type->name) { | |
514 | pr_info("Tracer must have a name\n"); | |
515 | return -1; | |
516 | } | |
517 | ||
518 | mutex_lock(&trace_types_lock); | |
519 | for (t = trace_types; t; t = t->next) { | |
520 | if (strcmp(type->name, t->name) == 0) { | |
521 | /* already found */ | |
522 | pr_info("Trace %s already registered\n", | |
523 | type->name); | |
524 | ret = -1; | |
525 | goto out; | |
526 | } | |
527 | } | |
528 | ||
60a11774 SR |
529 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
530 | if (type->selftest) { | |
531 | struct tracer *saved_tracer = current_trace; | |
60a11774 | 532 | struct trace_array *tr = &global_trace; |
60a11774 SR |
533 | int i; |
534 | /* | |
535 | * Run a selftest on this tracer. | |
536 | * Here we reset the trace buffer, and set the current | |
537 | * tracer to be this tracer. The tracer can then run some | |
538 | * internal tracing to verify that everything is in order. | |
539 | * If we fail, we do not register this tracer. | |
540 | */ | |
ab46428c | 541 | for_each_tracing_cpu(i) { |
3928a8a2 | 542 | tracing_reset(tr, i); |
60a11774 SR |
543 | } |
544 | current_trace = type; | |
60a11774 SR |
545 | /* the test is responsible for initializing and enabling */ |
546 | pr_info("Testing tracer %s: ", type->name); | |
547 | ret = type->selftest(type, tr); | |
548 | /* the test is responsible for resetting too */ | |
549 | current_trace = saved_tracer; | |
60a11774 SR |
550 | if (ret) { |
551 | printk(KERN_CONT "FAILED!\n"); | |
552 | goto out; | |
553 | } | |
1d4db00a | 554 | /* Only reset on passing, to avoid touching corrupted buffers */ |
ab46428c | 555 | for_each_tracing_cpu(i) { |
3928a8a2 | 556 | tracing_reset(tr, i); |
1d4db00a | 557 | } |
60a11774 SR |
558 | printk(KERN_CONT "PASSED\n"); |
559 | } | |
560 | #endif | |
561 | ||
bc0c38d1 SR |
562 | type->next = trace_types; |
563 | trace_types = type; | |
564 | len = strlen(type->name); | |
565 | if (len > max_tracer_type_len) | |
566 | max_tracer_type_len = len; | |
60a11774 | 567 | |
bc0c38d1 SR |
568 | out: |
569 | mutex_unlock(&trace_types_lock); | |
570 | ||
571 | return ret; | |
572 | } | |
573 | ||
574 | void unregister_tracer(struct tracer *type) | |
575 | { | |
576 | struct tracer **t; | |
577 | int len; | |
578 | ||
579 | mutex_lock(&trace_types_lock); | |
580 | for (t = &trace_types; *t; t = &(*t)->next) { | |
581 | if (*t == type) | |
582 | goto found; | |
583 | } | |
584 | pr_info("Trace %s not registered\n", type->name); | |
585 | goto out; | |
586 | ||
587 | found: | |
588 | *t = (*t)->next; | |
589 | if (strlen(type->name) != max_tracer_type_len) | |
590 | goto out; | |
591 | ||
592 | max_tracer_type_len = 0; | |
593 | for (t = &trace_types; *t; t = &(*t)->next) { | |
594 | len = strlen((*t)->name); | |
595 | if (len > max_tracer_type_len) | |
596 | max_tracer_type_len = len; | |
597 | } | |
598 | out: | |
599 | mutex_unlock(&trace_types_lock); | |
600 | } | |
601 | ||
3928a8a2 | 602 | void tracing_reset(struct trace_array *tr, int cpu) |
bc0c38d1 | 603 | { |
d769041f | 604 | ftrace_disable_cpu(); |
3928a8a2 | 605 | ring_buffer_reset_cpu(tr->buffer, cpu); |
d769041f | 606 | ftrace_enable_cpu(); |
bc0c38d1 SR |
607 | } |
608 | ||
bc0c38d1 SR |
609 | #define SAVED_CMDLINES 128 |
610 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; | |
611 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; | |
612 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; | |
613 | static int cmdline_idx; | |
614 | static DEFINE_SPINLOCK(trace_cmdline_lock); | |
25b0b44a | 615 | |
25b0b44a SR |
616 | /* temporary disable recording */ |
617 | atomic_t trace_record_cmdline_disabled __read_mostly; | |
bc0c38d1 SR |
618 | |
619 | static void trace_init_cmdlines(void) | |
620 | { | |
621 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); | |
622 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); | |
623 | cmdline_idx = 0; | |
624 | } | |
625 | ||
0f048701 SR |
626 | static int trace_stop_count; |
627 | static DEFINE_SPINLOCK(tracing_start_lock); | |
628 | ||
629 | /** | |
630 | * tracing_start - quick start of the tracer | |
631 | * | |
632 | * If tracing is enabled but was stopped by tracing_stop, | |
633 | * this will start the tracer back up. | |
634 | */ | |
635 | void tracing_start(void) | |
636 | { | |
637 | struct ring_buffer *buffer; | |
638 | unsigned long flags; | |
639 | ||
640 | if (tracing_disabled) | |
641 | return; | |
642 | ||
643 | spin_lock_irqsave(&tracing_start_lock, flags); | |
644 | if (--trace_stop_count) | |
645 | goto out; | |
646 | ||
647 | if (trace_stop_count < 0) { | |
648 | /* Someone screwed up their debugging */ | |
649 | WARN_ON_ONCE(1); | |
650 | trace_stop_count = 0; | |
651 | goto out; | |
652 | } | |
653 | ||
654 | ||
655 | buffer = global_trace.buffer; | |
656 | if (buffer) | |
657 | ring_buffer_record_enable(buffer); | |
658 | ||
659 | buffer = max_tr.buffer; | |
660 | if (buffer) | |
661 | ring_buffer_record_enable(buffer); | |
662 | ||
663 | ftrace_start(); | |
664 | out: | |
665 | spin_unlock_irqrestore(&tracing_start_lock, flags); | |
666 | } | |
667 | ||
668 | /** | |
669 | * tracing_stop - quick stop of the tracer | |
670 | * | |
671 | * Light weight way to stop tracing. Use in conjunction with | |
672 | * tracing_start. | |
673 | */ | |
674 | void tracing_stop(void) | |
675 | { | |
676 | struct ring_buffer *buffer; | |
677 | unsigned long flags; | |
678 | ||
679 | ftrace_stop(); | |
680 | spin_lock_irqsave(&tracing_start_lock, flags); | |
681 | if (trace_stop_count++) | |
682 | goto out; | |
683 | ||
684 | buffer = global_trace.buffer; | |
685 | if (buffer) | |
686 | ring_buffer_record_disable(buffer); | |
687 | ||
688 | buffer = max_tr.buffer; | |
689 | if (buffer) | |
690 | ring_buffer_record_disable(buffer); | |
691 | ||
692 | out: | |
693 | spin_unlock_irqrestore(&tracing_start_lock, flags); | |
694 | } | |
695 | ||
e309b41d | 696 | void trace_stop_cmdline_recording(void); |
bc0c38d1 | 697 | |
e309b41d | 698 | static void trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
699 | { |
700 | unsigned map; | |
701 | unsigned idx; | |
702 | ||
703 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
704 | return; | |
705 | ||
706 | /* | |
707 | * It's not the end of the world if we don't get | |
708 | * the lock, but we also don't want to spin | |
709 | * nor do we want to disable interrupts, | |
710 | * so if we miss here, then better luck next time. | |
711 | */ | |
712 | if (!spin_trylock(&trace_cmdline_lock)) | |
713 | return; | |
714 | ||
715 | idx = map_pid_to_cmdline[tsk->pid]; | |
716 | if (idx >= SAVED_CMDLINES) { | |
717 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; | |
718 | ||
719 | map = map_cmdline_to_pid[idx]; | |
720 | if (map <= PID_MAX_DEFAULT) | |
721 | map_pid_to_cmdline[map] = (unsigned)-1; | |
722 | ||
723 | map_pid_to_cmdline[tsk->pid] = idx; | |
724 | ||
725 | cmdline_idx = idx; | |
726 | } | |
727 | ||
728 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); | |
729 | ||
730 | spin_unlock(&trace_cmdline_lock); | |
731 | } | |
732 | ||
e309b41d | 733 | static char *trace_find_cmdline(int pid) |
bc0c38d1 SR |
734 | { |
735 | char *cmdline = "<...>"; | |
736 | unsigned map; | |
737 | ||
738 | if (!pid) | |
739 | return "<idle>"; | |
740 | ||
741 | if (pid > PID_MAX_DEFAULT) | |
742 | goto out; | |
743 | ||
744 | map = map_pid_to_cmdline[pid]; | |
745 | if (map >= SAVED_CMDLINES) | |
746 | goto out; | |
747 | ||
748 | cmdline = saved_cmdlines[map]; | |
749 | ||
750 | out: | |
751 | return cmdline; | |
752 | } | |
753 | ||
e309b41d | 754 | void tracing_record_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
755 | { |
756 | if (atomic_read(&trace_record_cmdline_disabled)) | |
757 | return; | |
758 | ||
759 | trace_save_cmdline(tsk); | |
760 | } | |
761 | ||
45dcd8b8 | 762 | void |
38697053 SR |
763 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags, |
764 | int pc) | |
bc0c38d1 SR |
765 | { |
766 | struct task_struct *tsk = current; | |
bc0c38d1 | 767 | |
777e208d SR |
768 | entry->preempt_count = pc & 0xff; |
769 | entry->pid = (tsk) ? tsk->pid : 0; | |
770 | entry->flags = | |
9244489a | 771 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT |
2e2ca155 | 772 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
9244489a SR |
773 | #else |
774 | TRACE_FLAG_IRQS_NOSUPPORT | | |
775 | #endif | |
bc0c38d1 SR |
776 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
777 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | | |
778 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); | |
779 | } | |
780 | ||
e309b41d | 781 | void |
6fb44b71 | 782 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
38697053 SR |
783 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
784 | int pc) | |
bc0c38d1 | 785 | { |
3928a8a2 | 786 | struct ring_buffer_event *event; |
777e208d | 787 | struct ftrace_entry *entry; |
dcb6308f | 788 | unsigned long irq_flags; |
bc0c38d1 | 789 | |
d769041f SR |
790 | /* If we are reading the ring buffer, don't trace */ |
791 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) | |
792 | return; | |
793 | ||
3928a8a2 SR |
794 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
795 | &irq_flags); | |
796 | if (!event) | |
797 | return; | |
798 | entry = ring_buffer_event_data(event); | |
38697053 | 799 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
800 | entry->ent.type = TRACE_FN; |
801 | entry->ip = ip; | |
802 | entry->parent_ip = parent_ip; | |
3928a8a2 | 803 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
bc0c38d1 SR |
804 | } |
805 | ||
15e6cb36 FW |
806 | #ifdef CONFIG_FUNCTION_RET_TRACER |
807 | static void __trace_function_return(struct trace_array *tr, | |
808 | struct trace_array_cpu *data, | |
809 | struct ftrace_retfunc *trace, | |
810 | unsigned long flags, | |
811 | int pc) | |
812 | { | |
813 | struct ring_buffer_event *event; | |
814 | struct ftrace_ret_entry *entry; | |
815 | unsigned long irq_flags; | |
816 | ||
817 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) | |
818 | return; | |
819 | ||
820 | event = ring_buffer_lock_reserve(global_trace.buffer, sizeof(*entry), | |
821 | &irq_flags); | |
822 | if (!event) | |
823 | return; | |
824 | entry = ring_buffer_event_data(event); | |
825 | tracing_generic_entry_update(&entry->ent, flags, pc); | |
826 | entry->ent.type = TRACE_FN_RET; | |
827 | entry->ip = trace->func; | |
828 | entry->parent_ip = trace->ret; | |
829 | entry->rettime = trace->rettime; | |
830 | entry->calltime = trace->calltime; | |
831 | ring_buffer_unlock_commit(global_trace.buffer, event, irq_flags); | |
832 | } | |
833 | #endif | |
834 | ||
e309b41d | 835 | void |
2e0f5761 | 836 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
38697053 SR |
837 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
838 | int pc) | |
2e0f5761 IM |
839 | { |
840 | if (likely(!atomic_read(&data->disabled))) | |
38697053 | 841 | trace_function(tr, data, ip, parent_ip, flags, pc); |
2e0f5761 IM |
842 | } |
843 | ||
38697053 SR |
844 | static void ftrace_trace_stack(struct trace_array *tr, |
845 | struct trace_array_cpu *data, | |
846 | unsigned long flags, | |
847 | int skip, int pc) | |
86387f7e | 848 | { |
c2c80529 | 849 | #ifdef CONFIG_STACKTRACE |
3928a8a2 | 850 | struct ring_buffer_event *event; |
777e208d | 851 | struct stack_entry *entry; |
86387f7e | 852 | struct stack_trace trace; |
3928a8a2 | 853 | unsigned long irq_flags; |
86387f7e IM |
854 | |
855 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) | |
856 | return; | |
857 | ||
3928a8a2 SR |
858 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
859 | &irq_flags); | |
860 | if (!event) | |
861 | return; | |
862 | entry = ring_buffer_event_data(event); | |
38697053 | 863 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d | 864 | entry->ent.type = TRACE_STACK; |
86387f7e | 865 | |
777e208d | 866 | memset(&entry->caller, 0, sizeof(entry->caller)); |
86387f7e IM |
867 | |
868 | trace.nr_entries = 0; | |
869 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
870 | trace.skip = skip; | |
777e208d | 871 | trace.entries = entry->caller; |
86387f7e IM |
872 | |
873 | save_stack_trace(&trace); | |
3928a8a2 | 874 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
c2c80529 | 875 | #endif |
f0a920d5 IM |
876 | } |
877 | ||
38697053 SR |
878 | void __trace_stack(struct trace_array *tr, |
879 | struct trace_array_cpu *data, | |
880 | unsigned long flags, | |
881 | int skip) | |
882 | { | |
883 | ftrace_trace_stack(tr, data, flags, skip, preempt_count()); | |
884 | } | |
885 | ||
886 | static void | |
887 | ftrace_trace_special(void *__tr, void *__data, | |
888 | unsigned long arg1, unsigned long arg2, unsigned long arg3, | |
889 | int pc) | |
a4feb834 | 890 | { |
3928a8a2 | 891 | struct ring_buffer_event *event; |
a4feb834 IM |
892 | struct trace_array_cpu *data = __data; |
893 | struct trace_array *tr = __tr; | |
777e208d | 894 | struct special_entry *entry; |
a4feb834 IM |
895 | unsigned long irq_flags; |
896 | ||
3928a8a2 SR |
897 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
898 | &irq_flags); | |
899 | if (!event) | |
900 | return; | |
901 | entry = ring_buffer_event_data(event); | |
38697053 | 902 | tracing_generic_entry_update(&entry->ent, 0, pc); |
777e208d SR |
903 | entry->ent.type = TRACE_SPECIAL; |
904 | entry->arg1 = arg1; | |
905 | entry->arg2 = arg2; | |
906 | entry->arg3 = arg3; | |
3928a8a2 | 907 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 908 | ftrace_trace_stack(tr, data, irq_flags, 4, pc); |
a4feb834 IM |
909 | |
910 | trace_wake_up(); | |
911 | } | |
912 | ||
38697053 SR |
913 | void |
914 | __trace_special(void *__tr, void *__data, | |
915 | unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
916 | { | |
917 | ftrace_trace_special(__tr, __data, arg1, arg2, arg3, preempt_count()); | |
918 | } | |
919 | ||
e309b41d | 920 | void |
bc0c38d1 SR |
921 | tracing_sched_switch_trace(struct trace_array *tr, |
922 | struct trace_array_cpu *data, | |
86387f7e IM |
923 | struct task_struct *prev, |
924 | struct task_struct *next, | |
38697053 | 925 | unsigned long flags, int pc) |
bc0c38d1 | 926 | { |
3928a8a2 | 927 | struct ring_buffer_event *event; |
777e208d | 928 | struct ctx_switch_entry *entry; |
dcb6308f | 929 | unsigned long irq_flags; |
bc0c38d1 | 930 | |
3928a8a2 SR |
931 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
932 | &irq_flags); | |
933 | if (!event) | |
934 | return; | |
935 | entry = ring_buffer_event_data(event); | |
38697053 | 936 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
937 | entry->ent.type = TRACE_CTX; |
938 | entry->prev_pid = prev->pid; | |
939 | entry->prev_prio = prev->prio; | |
940 | entry->prev_state = prev->state; | |
941 | entry->next_pid = next->pid; | |
942 | entry->next_prio = next->prio; | |
943 | entry->next_state = next->state; | |
944 | entry->next_cpu = task_cpu(next); | |
3928a8a2 | 945 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 946 | ftrace_trace_stack(tr, data, flags, 5, pc); |
bc0c38d1 SR |
947 | } |
948 | ||
57422797 IM |
949 | void |
950 | tracing_sched_wakeup_trace(struct trace_array *tr, | |
951 | struct trace_array_cpu *data, | |
86387f7e IM |
952 | struct task_struct *wakee, |
953 | struct task_struct *curr, | |
38697053 | 954 | unsigned long flags, int pc) |
57422797 | 955 | { |
3928a8a2 | 956 | struct ring_buffer_event *event; |
777e208d | 957 | struct ctx_switch_entry *entry; |
57422797 IM |
958 | unsigned long irq_flags; |
959 | ||
3928a8a2 SR |
960 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
961 | &irq_flags); | |
962 | if (!event) | |
963 | return; | |
964 | entry = ring_buffer_event_data(event); | |
38697053 | 965 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
966 | entry->ent.type = TRACE_WAKE; |
967 | entry->prev_pid = curr->pid; | |
968 | entry->prev_prio = curr->prio; | |
969 | entry->prev_state = curr->state; | |
970 | entry->next_pid = wakee->pid; | |
971 | entry->next_prio = wakee->prio; | |
972 | entry->next_state = wakee->state; | |
973 | entry->next_cpu = task_cpu(wakee); | |
3928a8a2 | 974 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 975 | ftrace_trace_stack(tr, data, flags, 6, pc); |
017730c1 IM |
976 | |
977 | trace_wake_up(); | |
57422797 IM |
978 | } |
979 | ||
4902f884 SR |
980 | void |
981 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
982 | { | |
983 | struct trace_array *tr = &global_trace; | |
984 | struct trace_array_cpu *data; | |
5aa1ba6a | 985 | unsigned long flags; |
4902f884 | 986 | int cpu; |
38697053 | 987 | int pc; |
4902f884 | 988 | |
c76f0694 | 989 | if (tracing_disabled) |
4902f884 SR |
990 | return; |
991 | ||
38697053 | 992 | pc = preempt_count(); |
5aa1ba6a | 993 | local_irq_save(flags); |
4902f884 SR |
994 | cpu = raw_smp_processor_id(); |
995 | data = tr->data[cpu]; | |
4902f884 | 996 | |
5aa1ba6a | 997 | if (likely(atomic_inc_return(&data->disabled) == 1)) |
38697053 | 998 | ftrace_trace_special(tr, data, arg1, arg2, arg3, pc); |
4902f884 | 999 | |
5aa1ba6a SR |
1000 | atomic_dec(&data->disabled); |
1001 | local_irq_restore(flags); | |
4902f884 SR |
1002 | } |
1003 | ||
606576ce | 1004 | #ifdef CONFIG_FUNCTION_TRACER |
e309b41d | 1005 | static void |
b2a866f9 | 1006 | function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip) |
2e0f5761 IM |
1007 | { |
1008 | struct trace_array *tr = &global_trace; | |
1009 | struct trace_array_cpu *data; | |
1010 | unsigned long flags; | |
1011 | long disabled; | |
38697053 SR |
1012 | int cpu, resched; |
1013 | int pc; | |
2e0f5761 | 1014 | |
60bc0800 | 1015 | if (unlikely(!ftrace_function_enabled)) |
2e0f5761 IM |
1016 | return; |
1017 | ||
38697053 | 1018 | pc = preempt_count(); |
182e9f5f | 1019 | resched = ftrace_preempt_disable(); |
38697053 | 1020 | local_save_flags(flags); |
2e0f5761 IM |
1021 | cpu = raw_smp_processor_id(); |
1022 | data = tr->data[cpu]; | |
1023 | disabled = atomic_inc_return(&data->disabled); | |
1024 | ||
1025 | if (likely(disabled == 1)) | |
38697053 | 1026 | trace_function(tr, data, ip, parent_ip, flags, pc); |
2e0f5761 IM |
1027 | |
1028 | atomic_dec(&data->disabled); | |
182e9f5f | 1029 | ftrace_preempt_enable(resched); |
2e0f5761 IM |
1030 | } |
1031 | ||
b2a866f9 SR |
1032 | static void |
1033 | function_trace_call(unsigned long ip, unsigned long parent_ip) | |
1034 | { | |
1035 | struct trace_array *tr = &global_trace; | |
1036 | struct trace_array_cpu *data; | |
1037 | unsigned long flags; | |
1038 | long disabled; | |
1039 | int cpu; | |
1040 | int pc; | |
1041 | ||
1042 | if (unlikely(!ftrace_function_enabled)) | |
1043 | return; | |
1044 | ||
1045 | /* | |
1046 | * Need to use raw, since this must be called before the | |
1047 | * recursive protection is performed. | |
1048 | */ | |
1049 | raw_local_irq_save(flags); | |
1050 | cpu = raw_smp_processor_id(); | |
1051 | data = tr->data[cpu]; | |
1052 | disabled = atomic_inc_return(&data->disabled); | |
1053 | ||
1054 | if (likely(disabled == 1)) { | |
1055 | pc = preempt_count(); | |
1056 | trace_function(tr, data, ip, parent_ip, flags, pc); | |
1057 | } | |
1058 | ||
1059 | atomic_dec(&data->disabled); | |
1060 | raw_local_irq_restore(flags); | |
1061 | } | |
1062 | ||
15e6cb36 FW |
1063 | #ifdef CONFIG_FUNCTION_RET_TRACER |
1064 | void trace_function_return(struct ftrace_retfunc *trace) | |
1065 | { | |
1066 | struct trace_array *tr = &global_trace; | |
1067 | struct trace_array_cpu *data; | |
1068 | unsigned long flags; | |
1069 | long disabled; | |
1070 | int cpu; | |
1071 | int pc; | |
1072 | ||
1073 | raw_local_irq_save(flags); | |
1074 | cpu = raw_smp_processor_id(); | |
1075 | data = tr->data[cpu]; | |
1076 | disabled = atomic_inc_return(&data->disabled); | |
1077 | if (likely(disabled == 1)) { | |
1078 | pc = preempt_count(); | |
1079 | __trace_function_return(tr, data, trace, flags, pc); | |
1080 | } | |
1081 | atomic_dec(&data->disabled); | |
1082 | raw_local_irq_restore(flags); | |
1083 | } | |
1084 | #endif /* CONFIG_FUNCTION_RET_TRACER */ | |
1085 | ||
2e0f5761 IM |
1086 | static struct ftrace_ops trace_ops __read_mostly = |
1087 | { | |
1088 | .func = function_trace_call, | |
1089 | }; | |
1090 | ||
e309b41d | 1091 | void tracing_start_function_trace(void) |
2e0f5761 | 1092 | { |
60bc0800 | 1093 | ftrace_function_enabled = 0; |
b2a866f9 SR |
1094 | |
1095 | if (trace_flags & TRACE_ITER_PREEMPTONLY) | |
1096 | trace_ops.func = function_trace_call_preempt_only; | |
1097 | else | |
1098 | trace_ops.func = function_trace_call; | |
1099 | ||
2e0f5761 | 1100 | register_ftrace_function(&trace_ops); |
9036990d | 1101 | ftrace_function_enabled = 1; |
2e0f5761 IM |
1102 | } |
1103 | ||
e309b41d | 1104 | void tracing_stop_function_trace(void) |
2e0f5761 | 1105 | { |
60bc0800 | 1106 | ftrace_function_enabled = 0; |
2e0f5761 IM |
1107 | unregister_ftrace_function(&trace_ops); |
1108 | } | |
1109 | #endif | |
1110 | ||
bc0c38d1 SR |
1111 | enum trace_file_type { |
1112 | TRACE_FILE_LAT_FMT = 1, | |
1113 | }; | |
1114 | ||
5a90f577 SR |
1115 | static void trace_iterator_increment(struct trace_iterator *iter, int cpu) |
1116 | { | |
d769041f SR |
1117 | /* Don't allow ftrace to trace into the ring buffers */ |
1118 | ftrace_disable_cpu(); | |
1119 | ||
5a90f577 | 1120 | iter->idx++; |
d769041f SR |
1121 | if (iter->buffer_iter[iter->cpu]) |
1122 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); | |
1123 | ||
1124 | ftrace_enable_cpu(); | |
5a90f577 SR |
1125 | } |
1126 | ||
e309b41d | 1127 | static struct trace_entry * |
3928a8a2 | 1128 | peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts) |
dd0e545f | 1129 | { |
3928a8a2 SR |
1130 | struct ring_buffer_event *event; |
1131 | struct ring_buffer_iter *buf_iter = iter->buffer_iter[cpu]; | |
dd0e545f | 1132 | |
d769041f SR |
1133 | /* Don't allow ftrace to trace into the ring buffers */ |
1134 | ftrace_disable_cpu(); | |
1135 | ||
1136 | if (buf_iter) | |
1137 | event = ring_buffer_iter_peek(buf_iter, ts); | |
1138 | else | |
1139 | event = ring_buffer_peek(iter->tr->buffer, cpu, ts); | |
1140 | ||
1141 | ftrace_enable_cpu(); | |
1142 | ||
3928a8a2 | 1143 | return event ? ring_buffer_event_data(event) : NULL; |
dd0e545f | 1144 | } |
d769041f | 1145 | |
dd0e545f | 1146 | static struct trace_entry * |
3928a8a2 | 1147 | __find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
bc0c38d1 | 1148 | { |
3928a8a2 | 1149 | struct ring_buffer *buffer = iter->tr->buffer; |
bc0c38d1 | 1150 | struct trace_entry *ent, *next = NULL; |
3928a8a2 | 1151 | u64 next_ts = 0, ts; |
bc0c38d1 SR |
1152 | int next_cpu = -1; |
1153 | int cpu; | |
1154 | ||
ab46428c | 1155 | for_each_tracing_cpu(cpu) { |
dd0e545f | 1156 | |
3928a8a2 SR |
1157 | if (ring_buffer_empty_cpu(buffer, cpu)) |
1158 | continue; | |
dd0e545f | 1159 | |
3928a8a2 | 1160 | ent = peek_next_entry(iter, cpu, &ts); |
dd0e545f | 1161 | |
cdd31cd2 IM |
1162 | /* |
1163 | * Pick the entry with the smallest timestamp: | |
1164 | */ | |
3928a8a2 | 1165 | if (ent && (!next || ts < next_ts)) { |
bc0c38d1 SR |
1166 | next = ent; |
1167 | next_cpu = cpu; | |
3928a8a2 | 1168 | next_ts = ts; |
bc0c38d1 SR |
1169 | } |
1170 | } | |
1171 | ||
1172 | if (ent_cpu) | |
1173 | *ent_cpu = next_cpu; | |
1174 | ||
3928a8a2 SR |
1175 | if (ent_ts) |
1176 | *ent_ts = next_ts; | |
1177 | ||
bc0c38d1 SR |
1178 | return next; |
1179 | } | |
1180 | ||
dd0e545f SR |
1181 | /* Find the next real entry, without updating the iterator itself */ |
1182 | static struct trace_entry * | |
3928a8a2 | 1183 | find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
bc0c38d1 | 1184 | { |
3928a8a2 | 1185 | return __find_next_entry(iter, ent_cpu, ent_ts); |
dd0e545f SR |
1186 | } |
1187 | ||
1188 | /* Find the next real entry, and increment the iterator to the next entry */ | |
1189 | static void *find_next_entry_inc(struct trace_iterator *iter) | |
1190 | { | |
3928a8a2 | 1191 | iter->ent = __find_next_entry(iter, &iter->cpu, &iter->ts); |
dd0e545f | 1192 | |
3928a8a2 | 1193 | if (iter->ent) |
dd0e545f SR |
1194 | trace_iterator_increment(iter, iter->cpu); |
1195 | ||
3928a8a2 | 1196 | return iter->ent ? iter : NULL; |
b3806b43 | 1197 | } |
bc0c38d1 | 1198 | |
e309b41d | 1199 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 | 1200 | { |
d769041f SR |
1201 | /* Don't allow ftrace to trace into the ring buffers */ |
1202 | ftrace_disable_cpu(); | |
3928a8a2 | 1203 | ring_buffer_consume(iter->tr->buffer, iter->cpu, &iter->ts); |
d769041f | 1204 | ftrace_enable_cpu(); |
bc0c38d1 SR |
1205 | } |
1206 | ||
e309b41d | 1207 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
1208 | { |
1209 | struct trace_iterator *iter = m->private; | |
bc0c38d1 | 1210 | int i = (int)*pos; |
4e3c3333 | 1211 | void *ent; |
bc0c38d1 SR |
1212 | |
1213 | (*pos)++; | |
1214 | ||
1215 | /* can't go backwards */ | |
1216 | if (iter->idx > i) | |
1217 | return NULL; | |
1218 | ||
1219 | if (iter->idx < 0) | |
1220 | ent = find_next_entry_inc(iter); | |
1221 | else | |
1222 | ent = iter; | |
1223 | ||
1224 | while (ent && iter->idx < i) | |
1225 | ent = find_next_entry_inc(iter); | |
1226 | ||
1227 | iter->pos = *pos; | |
1228 | ||
bc0c38d1 SR |
1229 | return ent; |
1230 | } | |
1231 | ||
1232 | static void *s_start(struct seq_file *m, loff_t *pos) | |
1233 | { | |
1234 | struct trace_iterator *iter = m->private; | |
1235 | void *p = NULL; | |
1236 | loff_t l = 0; | |
3928a8a2 | 1237 | int cpu; |
bc0c38d1 SR |
1238 | |
1239 | mutex_lock(&trace_types_lock); | |
1240 | ||
d15f57f2 SR |
1241 | if (!current_trace || current_trace != iter->trace) { |
1242 | mutex_unlock(&trace_types_lock); | |
bc0c38d1 | 1243 | return NULL; |
d15f57f2 | 1244 | } |
bc0c38d1 SR |
1245 | |
1246 | atomic_inc(&trace_record_cmdline_disabled); | |
1247 | ||
bc0c38d1 SR |
1248 | if (*pos != iter->pos) { |
1249 | iter->ent = NULL; | |
1250 | iter->cpu = 0; | |
1251 | iter->idx = -1; | |
1252 | ||
d769041f SR |
1253 | ftrace_disable_cpu(); |
1254 | ||
3928a8a2 SR |
1255 | for_each_tracing_cpu(cpu) { |
1256 | ring_buffer_iter_reset(iter->buffer_iter[cpu]); | |
4c11d7ae | 1257 | } |
bc0c38d1 | 1258 | |
d769041f SR |
1259 | ftrace_enable_cpu(); |
1260 | ||
bc0c38d1 SR |
1261 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
1262 | ; | |
1263 | ||
1264 | } else { | |
4c11d7ae | 1265 | l = *pos - 1; |
bc0c38d1 SR |
1266 | p = s_next(m, p, &l); |
1267 | } | |
1268 | ||
1269 | return p; | |
1270 | } | |
1271 | ||
1272 | static void s_stop(struct seq_file *m, void *p) | |
1273 | { | |
bc0c38d1 | 1274 | atomic_dec(&trace_record_cmdline_disabled); |
bc0c38d1 SR |
1275 | mutex_unlock(&trace_types_lock); |
1276 | } | |
1277 | ||
76094a2c | 1278 | #ifdef CONFIG_KRETPROBES |
b3aa5577 | 1279 | static inline const char *kretprobed(const char *name) |
76094a2c | 1280 | { |
b3aa5577 SR |
1281 | static const char tramp_name[] = "kretprobe_trampoline"; |
1282 | int size = sizeof(tramp_name); | |
1283 | ||
1284 | if (strncmp(tramp_name, name, size) == 0) | |
1285 | return "[unknown/kretprobe'd]"; | |
1286 | return name; | |
76094a2c AS |
1287 | } |
1288 | #else | |
b3aa5577 | 1289 | static inline const char *kretprobed(const char *name) |
76094a2c | 1290 | { |
b3aa5577 | 1291 | return name; |
76094a2c AS |
1292 | } |
1293 | #endif /* CONFIG_KRETPROBES */ | |
1294 | ||
b3806b43 | 1295 | static int |
214023c3 | 1296 | seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) |
bc0c38d1 SR |
1297 | { |
1298 | #ifdef CONFIG_KALLSYMS | |
1299 | char str[KSYM_SYMBOL_LEN]; | |
b3aa5577 | 1300 | const char *name; |
bc0c38d1 SR |
1301 | |
1302 | kallsyms_lookup(address, NULL, NULL, NULL, str); | |
1303 | ||
b3aa5577 SR |
1304 | name = kretprobed(str); |
1305 | ||
1306 | return trace_seq_printf(s, fmt, name); | |
bc0c38d1 | 1307 | #endif |
b3806b43 | 1308 | return 1; |
bc0c38d1 SR |
1309 | } |
1310 | ||
b3806b43 | 1311 | static int |
214023c3 SR |
1312 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
1313 | unsigned long address) | |
bc0c38d1 SR |
1314 | { |
1315 | #ifdef CONFIG_KALLSYMS | |
1316 | char str[KSYM_SYMBOL_LEN]; | |
b3aa5577 | 1317 | const char *name; |
bc0c38d1 SR |
1318 | |
1319 | sprint_symbol(str, address); | |
b3aa5577 SR |
1320 | name = kretprobed(str); |
1321 | ||
1322 | return trace_seq_printf(s, fmt, name); | |
bc0c38d1 | 1323 | #endif |
b3806b43 | 1324 | return 1; |
bc0c38d1 SR |
1325 | } |
1326 | ||
1327 | #ifndef CONFIG_64BIT | |
1328 | # define IP_FMT "%08lx" | |
1329 | #else | |
1330 | # define IP_FMT "%016lx" | |
1331 | #endif | |
1332 | ||
15e6cb36 | 1333 | int |
214023c3 | 1334 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) |
bc0c38d1 | 1335 | { |
b3806b43 SR |
1336 | int ret; |
1337 | ||
1338 | if (!ip) | |
1339 | return trace_seq_printf(s, "0"); | |
bc0c38d1 SR |
1340 | |
1341 | if (sym_flags & TRACE_ITER_SYM_OFFSET) | |
b3806b43 | 1342 | ret = seq_print_sym_offset(s, "%s", ip); |
bc0c38d1 | 1343 | else |
b3806b43 SR |
1344 | ret = seq_print_sym_short(s, "%s", ip); |
1345 | ||
1346 | if (!ret) | |
1347 | return 0; | |
bc0c38d1 SR |
1348 | |
1349 | if (sym_flags & TRACE_ITER_SYM_ADDR) | |
b3806b43 SR |
1350 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
1351 | return ret; | |
bc0c38d1 SR |
1352 | } |
1353 | ||
e309b41d | 1354 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 | 1355 | { |
a6168353 ME |
1356 | seq_puts(m, "# _------=> CPU# \n"); |
1357 | seq_puts(m, "# / _-----=> irqs-off \n"); | |
1358 | seq_puts(m, "# | / _----=> need-resched \n"); | |
1359 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); | |
1360 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); | |
1361 | seq_puts(m, "# |||| / \n"); | |
1362 | seq_puts(m, "# ||||| delay \n"); | |
1363 | seq_puts(m, "# cmd pid ||||| time | caller \n"); | |
1364 | seq_puts(m, "# \\ / ||||| \\ | / \n"); | |
bc0c38d1 SR |
1365 | } |
1366 | ||
e309b41d | 1367 | static void print_func_help_header(struct seq_file *m) |
bc0c38d1 | 1368 | { |
a6168353 ME |
1369 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
1370 | seq_puts(m, "# | | | | |\n"); | |
bc0c38d1 SR |
1371 | } |
1372 | ||
1373 | ||
e309b41d | 1374 | static void |
bc0c38d1 SR |
1375 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
1376 | { | |
1377 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); | |
1378 | struct trace_array *tr = iter->tr; | |
1379 | struct trace_array_cpu *data = tr->data[tr->cpu]; | |
1380 | struct tracer *type = current_trace; | |
3928a8a2 SR |
1381 | unsigned long total; |
1382 | unsigned long entries; | |
bc0c38d1 SR |
1383 | const char *name = "preemption"; |
1384 | ||
1385 | if (type) | |
1386 | name = type->name; | |
1387 | ||
3928a8a2 SR |
1388 | entries = ring_buffer_entries(iter->tr->buffer); |
1389 | total = entries + | |
1390 | ring_buffer_overruns(iter->tr->buffer); | |
bc0c38d1 SR |
1391 | |
1392 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", | |
1393 | name, UTS_RELEASE); | |
1394 | seq_puts(m, "-----------------------------------" | |
1395 | "---------------------------------\n"); | |
1396 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" | |
1397 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", | |
57f50be1 | 1398 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 1399 | entries, |
4c11d7ae | 1400 | total, |
bc0c38d1 SR |
1401 | tr->cpu, |
1402 | #if defined(CONFIG_PREEMPT_NONE) | |
1403 | "server", | |
1404 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
1405 | "desktop", | |
b5c21b45 | 1406 | #elif defined(CONFIG_PREEMPT) |
bc0c38d1 SR |
1407 | "preempt", |
1408 | #else | |
1409 | "unknown", | |
1410 | #endif | |
1411 | /* These are reserved for later use */ | |
1412 | 0, 0, 0, 0); | |
1413 | #ifdef CONFIG_SMP | |
1414 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
1415 | #else | |
1416 | seq_puts(m, ")\n"); | |
1417 | #endif | |
1418 | seq_puts(m, " -----------------\n"); | |
1419 | seq_printf(m, " | task: %.16s-%d " | |
1420 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", | |
1421 | data->comm, data->pid, data->uid, data->nice, | |
1422 | data->policy, data->rt_priority); | |
1423 | seq_puts(m, " -----------------\n"); | |
1424 | ||
1425 | if (data->critical_start) { | |
1426 | seq_puts(m, " => started at: "); | |
214023c3 SR |
1427 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
1428 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 | 1429 | seq_puts(m, "\n => ended at: "); |
214023c3 SR |
1430 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
1431 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 SR |
1432 | seq_puts(m, "\n"); |
1433 | } | |
1434 | ||
1435 | seq_puts(m, "\n"); | |
1436 | } | |
1437 | ||
e309b41d | 1438 | static void |
214023c3 | 1439 | lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) |
bc0c38d1 SR |
1440 | { |
1441 | int hardirq, softirq; | |
1442 | char *comm; | |
1443 | ||
777e208d | 1444 | comm = trace_find_cmdline(entry->pid); |
bc0c38d1 | 1445 | |
777e208d | 1446 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
a6168353 | 1447 | trace_seq_printf(s, "%3d", cpu); |
214023c3 | 1448 | trace_seq_printf(s, "%c%c", |
9244489a SR |
1449 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : |
1450 | (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : '.', | |
777e208d | 1451 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); |
bc0c38d1 | 1452 | |
777e208d SR |
1453 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; |
1454 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; | |
afc2abc0 | 1455 | if (hardirq && softirq) { |
214023c3 | 1456 | trace_seq_putc(s, 'H'); |
afc2abc0 IM |
1457 | } else { |
1458 | if (hardirq) { | |
214023c3 | 1459 | trace_seq_putc(s, 'h'); |
afc2abc0 | 1460 | } else { |
bc0c38d1 | 1461 | if (softirq) |
214023c3 | 1462 | trace_seq_putc(s, 's'); |
bc0c38d1 | 1463 | else |
214023c3 | 1464 | trace_seq_putc(s, '.'); |
bc0c38d1 SR |
1465 | } |
1466 | } | |
1467 | ||
777e208d SR |
1468 | if (entry->preempt_count) |
1469 | trace_seq_printf(s, "%x", entry->preempt_count); | |
bc0c38d1 | 1470 | else |
214023c3 | 1471 | trace_seq_puts(s, "."); |
bc0c38d1 SR |
1472 | } |
1473 | ||
1474 | unsigned long preempt_mark_thresh = 100; | |
1475 | ||
e309b41d | 1476 | static void |
3928a8a2 | 1477 | lat_print_timestamp(struct trace_seq *s, u64 abs_usecs, |
bc0c38d1 SR |
1478 | unsigned long rel_usecs) |
1479 | { | |
214023c3 | 1480 | trace_seq_printf(s, " %4lldus", abs_usecs); |
bc0c38d1 | 1481 | if (rel_usecs > preempt_mark_thresh) |
214023c3 | 1482 | trace_seq_puts(s, "!: "); |
bc0c38d1 | 1483 | else if (rel_usecs > 1) |
214023c3 | 1484 | trace_seq_puts(s, "+: "); |
bc0c38d1 | 1485 | else |
214023c3 | 1486 | trace_seq_puts(s, " : "); |
bc0c38d1 SR |
1487 | } |
1488 | ||
1489 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; | |
1490 | ||
fc5e27ae PP |
1491 | /* |
1492 | * The message is supposed to contain an ending newline. | |
1493 | * If the printing stops prematurely, try to add a newline of our own. | |
1494 | */ | |
1495 | void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter) | |
dd0e545f | 1496 | { |
dd0e545f | 1497 | struct trace_entry *ent; |
777e208d | 1498 | struct trace_field_cont *cont; |
fc5e27ae | 1499 | bool ok = true; |
dd0e545f | 1500 | |
3928a8a2 | 1501 | ent = peek_next_entry(iter, iter->cpu, NULL); |
dd0e545f SR |
1502 | if (!ent || ent->type != TRACE_CONT) { |
1503 | trace_seq_putc(s, '\n'); | |
1504 | return; | |
1505 | } | |
1506 | ||
1507 | do { | |
777e208d | 1508 | cont = (struct trace_field_cont *)ent; |
fc5e27ae | 1509 | if (ok) |
777e208d | 1510 | ok = (trace_seq_printf(s, "%s", cont->buf) > 0); |
d769041f SR |
1511 | |
1512 | ftrace_disable_cpu(); | |
1513 | ||
1514 | if (iter->buffer_iter[iter->cpu]) | |
1515 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); | |
1516 | else | |
1517 | ring_buffer_consume(iter->tr->buffer, iter->cpu, NULL); | |
1518 | ||
1519 | ftrace_enable_cpu(); | |
1520 | ||
3928a8a2 | 1521 | ent = peek_next_entry(iter, iter->cpu, NULL); |
dd0e545f | 1522 | } while (ent && ent->type == TRACE_CONT); |
fc5e27ae PP |
1523 | |
1524 | if (!ok) | |
1525 | trace_seq_putc(s, '\n'); | |
dd0e545f SR |
1526 | } |
1527 | ||
a309720c SR |
1528 | static void test_cpu_buff_start(struct trace_iterator *iter) |
1529 | { | |
1530 | struct trace_seq *s = &iter->seq; | |
1531 | ||
1532 | if (cpu_isset(iter->cpu, iter->started)) | |
1533 | return; | |
1534 | ||
1535 | cpu_set(iter->cpu, iter->started); | |
1536 | trace_seq_printf(s, "##### CPU %u buffer started ####\n", iter->cpu); | |
1537 | } | |
1538 | ||
2c4f035f | 1539 | static enum print_line_t |
214023c3 | 1540 | print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) |
bc0c38d1 | 1541 | { |
214023c3 | 1542 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1543 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
3928a8a2 | 1544 | struct trace_entry *next_entry; |
bc0c38d1 SR |
1545 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); |
1546 | struct trace_entry *entry = iter->ent; | |
1547 | unsigned long abs_usecs; | |
1548 | unsigned long rel_usecs; | |
3928a8a2 | 1549 | u64 next_ts; |
bc0c38d1 | 1550 | char *comm; |
bac524d3 | 1551 | int S, T; |
86387f7e | 1552 | int i; |
d17d9691 | 1553 | unsigned state; |
bc0c38d1 | 1554 | |
dd0e545f | 1555 | if (entry->type == TRACE_CONT) |
2c4f035f | 1556 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1557 | |
a309720c SR |
1558 | test_cpu_buff_start(iter); |
1559 | ||
3928a8a2 SR |
1560 | next_entry = find_next_entry(iter, NULL, &next_ts); |
1561 | if (!next_entry) | |
1562 | next_ts = iter->ts; | |
1563 | rel_usecs = ns2usecs(next_ts - iter->ts); | |
1564 | abs_usecs = ns2usecs(iter->ts - iter->tr->time_start); | |
bc0c38d1 SR |
1565 | |
1566 | if (verbose) { | |
777e208d | 1567 | comm = trace_find_cmdline(entry->pid); |
a6168353 | 1568 | trace_seq_printf(s, "%16s %5d %3d %d %08x %08x [%08lx]" |
214023c3 SR |
1569 | " %ld.%03ldms (+%ld.%03ldms): ", |
1570 | comm, | |
777e208d SR |
1571 | entry->pid, cpu, entry->flags, |
1572 | entry->preempt_count, trace_idx, | |
3928a8a2 | 1573 | ns2usecs(iter->ts), |
214023c3 SR |
1574 | abs_usecs/1000, |
1575 | abs_usecs % 1000, rel_usecs/1000, | |
1576 | rel_usecs % 1000); | |
bc0c38d1 | 1577 | } else { |
f29c73fe IM |
1578 | lat_print_generic(s, entry, cpu); |
1579 | lat_print_timestamp(s, abs_usecs, rel_usecs); | |
bc0c38d1 SR |
1580 | } |
1581 | switch (entry->type) { | |
777e208d | 1582 | case TRACE_FN: { |
7104f300 SR |
1583 | struct ftrace_entry *field; |
1584 | ||
1585 | trace_assign_type(field, entry); | |
777e208d SR |
1586 | |
1587 | seq_print_ip_sym(s, field->ip, sym_flags); | |
214023c3 | 1588 | trace_seq_puts(s, " ("); |
b3aa5577 | 1589 | seq_print_ip_sym(s, field->parent_ip, sym_flags); |
214023c3 | 1590 | trace_seq_puts(s, ")\n"); |
bc0c38d1 | 1591 | break; |
777e208d | 1592 | } |
bc0c38d1 | 1593 | case TRACE_CTX: |
777e208d | 1594 | case TRACE_WAKE: { |
7104f300 SR |
1595 | struct ctx_switch_entry *field; |
1596 | ||
1597 | trace_assign_type(field, entry); | |
777e208d SR |
1598 | |
1599 | T = field->next_state < sizeof(state_to_char) ? | |
1600 | state_to_char[field->next_state] : 'X'; | |
bac524d3 | 1601 | |
777e208d SR |
1602 | state = field->prev_state ? |
1603 | __ffs(field->prev_state) + 1 : 0; | |
d17d9691 | 1604 | S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X'; |
777e208d | 1605 | comm = trace_find_cmdline(field->next_pid); |
80b5e940 | 1606 | trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n", |
777e208d SR |
1607 | field->prev_pid, |
1608 | field->prev_prio, | |
57422797 | 1609 | S, entry->type == TRACE_CTX ? "==>" : " +", |
777e208d SR |
1610 | field->next_cpu, |
1611 | field->next_pid, | |
1612 | field->next_prio, | |
bac524d3 | 1613 | T, comm); |
bc0c38d1 | 1614 | break; |
777e208d SR |
1615 | } |
1616 | case TRACE_SPECIAL: { | |
7104f300 SR |
1617 | struct special_entry *field; |
1618 | ||
1619 | trace_assign_type(field, entry); | |
777e208d | 1620 | |
88a4216c | 1621 | trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
1622 | field->arg1, |
1623 | field->arg2, | |
1624 | field->arg3); | |
f0a920d5 | 1625 | break; |
777e208d SR |
1626 | } |
1627 | case TRACE_STACK: { | |
7104f300 SR |
1628 | struct stack_entry *field; |
1629 | ||
1630 | trace_assign_type(field, entry); | |
777e208d | 1631 | |
86387f7e IM |
1632 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
1633 | if (i) | |
1634 | trace_seq_puts(s, " <= "); | |
777e208d | 1635 | seq_print_ip_sym(s, field->caller[i], sym_flags); |
86387f7e IM |
1636 | } |
1637 | trace_seq_puts(s, "\n"); | |
1638 | break; | |
777e208d SR |
1639 | } |
1640 | case TRACE_PRINT: { | |
7104f300 SR |
1641 | struct print_entry *field; |
1642 | ||
1643 | trace_assign_type(field, entry); | |
777e208d SR |
1644 | |
1645 | seq_print_ip_sym(s, field->ip, sym_flags); | |
1646 | trace_seq_printf(s, ": %s", field->buf); | |
1647 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
1648 | trace_seq_print_cont(s, iter); |
1649 | break; | |
777e208d | 1650 | } |
89b2f978 | 1651 | default: |
214023c3 | 1652 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
bc0c38d1 | 1653 | } |
2c4f035f | 1654 | return TRACE_TYPE_HANDLED; |
bc0c38d1 SR |
1655 | } |
1656 | ||
2c4f035f | 1657 | static enum print_line_t print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 1658 | { |
214023c3 | 1659 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1660 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 1661 | struct trace_entry *entry; |
bc0c38d1 SR |
1662 | unsigned long usec_rem; |
1663 | unsigned long long t; | |
1664 | unsigned long secs; | |
1665 | char *comm; | |
b3806b43 | 1666 | int ret; |
bac524d3 | 1667 | int S, T; |
86387f7e | 1668 | int i; |
bc0c38d1 | 1669 | |
4e3c3333 | 1670 | entry = iter->ent; |
dd0e545f SR |
1671 | |
1672 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1673 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1674 | |
a309720c SR |
1675 | test_cpu_buff_start(iter); |
1676 | ||
777e208d | 1677 | comm = trace_find_cmdline(iter->ent->pid); |
bc0c38d1 | 1678 | |
3928a8a2 | 1679 | t = ns2usecs(iter->ts); |
bc0c38d1 SR |
1680 | usec_rem = do_div(t, 1000000ULL); |
1681 | secs = (unsigned long)t; | |
1682 | ||
777e208d | 1683 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
f29c73fe | 1684 | if (!ret) |
2c4f035f | 1685 | return TRACE_TYPE_PARTIAL_LINE; |
a6168353 | 1686 | ret = trace_seq_printf(s, "[%03d] ", iter->cpu); |
f29c73fe | 1687 | if (!ret) |
2c4f035f | 1688 | return TRACE_TYPE_PARTIAL_LINE; |
f29c73fe IM |
1689 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); |
1690 | if (!ret) | |
2c4f035f | 1691 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 SR |
1692 | |
1693 | switch (entry->type) { | |
777e208d | 1694 | case TRACE_FN: { |
7104f300 SR |
1695 | struct ftrace_entry *field; |
1696 | ||
1697 | trace_assign_type(field, entry); | |
777e208d SR |
1698 | |
1699 | ret = seq_print_ip_sym(s, field->ip, sym_flags); | |
b3806b43 | 1700 | if (!ret) |
2c4f035f | 1701 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1702 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
777e208d | 1703 | field->parent_ip) { |
b3806b43 SR |
1704 | ret = trace_seq_printf(s, " <-"); |
1705 | if (!ret) | |
2c4f035f | 1706 | return TRACE_TYPE_PARTIAL_LINE; |
b3aa5577 SR |
1707 | ret = seq_print_ip_sym(s, |
1708 | field->parent_ip, | |
1709 | sym_flags); | |
b3806b43 | 1710 | if (!ret) |
2c4f035f | 1711 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1712 | } |
b3806b43 SR |
1713 | ret = trace_seq_printf(s, "\n"); |
1714 | if (!ret) | |
2c4f035f | 1715 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1716 | break; |
777e208d | 1717 | } |
bc0c38d1 | 1718 | case TRACE_CTX: |
777e208d | 1719 | case TRACE_WAKE: { |
7104f300 SR |
1720 | struct ctx_switch_entry *field; |
1721 | ||
1722 | trace_assign_type(field, entry); | |
777e208d SR |
1723 | |
1724 | S = field->prev_state < sizeof(state_to_char) ? | |
1725 | state_to_char[field->prev_state] : 'X'; | |
1726 | T = field->next_state < sizeof(state_to_char) ? | |
1727 | state_to_char[field->next_state] : 'X'; | |
80b5e940 | 1728 | ret = trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c\n", |
777e208d SR |
1729 | field->prev_pid, |
1730 | field->prev_prio, | |
b3806b43 | 1731 | S, |
57422797 | 1732 | entry->type == TRACE_CTX ? "==>" : " +", |
777e208d SR |
1733 | field->next_cpu, |
1734 | field->next_pid, | |
1735 | field->next_prio, | |
bac524d3 | 1736 | T); |
b3806b43 | 1737 | if (!ret) |
2c4f035f | 1738 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1739 | break; |
777e208d SR |
1740 | } |
1741 | case TRACE_SPECIAL: { | |
7104f300 SR |
1742 | struct special_entry *field; |
1743 | ||
1744 | trace_assign_type(field, entry); | |
777e208d | 1745 | |
88a4216c | 1746 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
1747 | field->arg1, |
1748 | field->arg2, | |
1749 | field->arg3); | |
f0a920d5 | 1750 | if (!ret) |
2c4f035f | 1751 | return TRACE_TYPE_PARTIAL_LINE; |
f0a920d5 | 1752 | break; |
777e208d SR |
1753 | } |
1754 | case TRACE_STACK: { | |
7104f300 SR |
1755 | struct stack_entry *field; |
1756 | ||
1757 | trace_assign_type(field, entry); | |
777e208d | 1758 | |
86387f7e IM |
1759 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
1760 | if (i) { | |
1761 | ret = trace_seq_puts(s, " <= "); | |
1762 | if (!ret) | |
2c4f035f | 1763 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e | 1764 | } |
777e208d | 1765 | ret = seq_print_ip_sym(s, field->caller[i], |
86387f7e IM |
1766 | sym_flags); |
1767 | if (!ret) | |
2c4f035f | 1768 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e IM |
1769 | } |
1770 | ret = trace_seq_puts(s, "\n"); | |
1771 | if (!ret) | |
2c4f035f | 1772 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e | 1773 | break; |
777e208d SR |
1774 | } |
1775 | case TRACE_PRINT: { | |
7104f300 SR |
1776 | struct print_entry *field; |
1777 | ||
1778 | trace_assign_type(field, entry); | |
777e208d SR |
1779 | |
1780 | seq_print_ip_sym(s, field->ip, sym_flags); | |
1781 | trace_seq_printf(s, ": %s", field->buf); | |
1782 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
1783 | trace_seq_print_cont(s, iter); |
1784 | break; | |
bc0c38d1 | 1785 | } |
15e6cb36 FW |
1786 | case TRACE_FN_RET: { |
1787 | return print_return_function(iter); | |
1788 | break; | |
1789 | } | |
777e208d | 1790 | } |
2c4f035f | 1791 | return TRACE_TYPE_HANDLED; |
bc0c38d1 SR |
1792 | } |
1793 | ||
2c4f035f | 1794 | static enum print_line_t print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 IM |
1795 | { |
1796 | struct trace_seq *s = &iter->seq; | |
1797 | struct trace_entry *entry; | |
1798 | int ret; | |
bac524d3 | 1799 | int S, T; |
f9896bf3 IM |
1800 | |
1801 | entry = iter->ent; | |
dd0e545f SR |
1802 | |
1803 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1804 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1805 | |
f9896bf3 | 1806 | ret = trace_seq_printf(s, "%d %d %llu ", |
777e208d | 1807 | entry->pid, iter->cpu, iter->ts); |
f9896bf3 | 1808 | if (!ret) |
2c4f035f | 1809 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 IM |
1810 | |
1811 | switch (entry->type) { | |
777e208d | 1812 | case TRACE_FN: { |
7104f300 SR |
1813 | struct ftrace_entry *field; |
1814 | ||
1815 | trace_assign_type(field, entry); | |
777e208d | 1816 | |
f9896bf3 | 1817 | ret = trace_seq_printf(s, "%x %x\n", |
777e208d SR |
1818 | field->ip, |
1819 | field->parent_ip); | |
f9896bf3 | 1820 | if (!ret) |
2c4f035f | 1821 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 | 1822 | break; |
777e208d | 1823 | } |
f9896bf3 | 1824 | case TRACE_CTX: |
777e208d | 1825 | case TRACE_WAKE: { |
7104f300 SR |
1826 | struct ctx_switch_entry *field; |
1827 | ||
1828 | trace_assign_type(field, entry); | |
777e208d SR |
1829 | |
1830 | S = field->prev_state < sizeof(state_to_char) ? | |
1831 | state_to_char[field->prev_state] : 'X'; | |
1832 | T = field->next_state < sizeof(state_to_char) ? | |
1833 | state_to_char[field->next_state] : 'X'; | |
57422797 IM |
1834 | if (entry->type == TRACE_WAKE) |
1835 | S = '+'; | |
80b5e940 | 1836 | ret = trace_seq_printf(s, "%d %d %c %d %d %d %c\n", |
777e208d SR |
1837 | field->prev_pid, |
1838 | field->prev_prio, | |
f9896bf3 | 1839 | S, |
777e208d SR |
1840 | field->next_cpu, |
1841 | field->next_pid, | |
1842 | field->next_prio, | |
bac524d3 | 1843 | T); |
f9896bf3 | 1844 | if (!ret) |
2c4f035f | 1845 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 | 1846 | break; |
777e208d | 1847 | } |
f0a920d5 | 1848 | case TRACE_SPECIAL: |
777e208d | 1849 | case TRACE_STACK: { |
7104f300 SR |
1850 | struct special_entry *field; |
1851 | ||
1852 | trace_assign_type(field, entry); | |
777e208d | 1853 | |
88a4216c | 1854 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
1855 | field->arg1, |
1856 | field->arg2, | |
1857 | field->arg3); | |
f0a920d5 | 1858 | if (!ret) |
2c4f035f | 1859 | return TRACE_TYPE_PARTIAL_LINE; |
f0a920d5 | 1860 | break; |
777e208d SR |
1861 | } |
1862 | case TRACE_PRINT: { | |
7104f300 SR |
1863 | struct print_entry *field; |
1864 | ||
1865 | trace_assign_type(field, entry); | |
777e208d SR |
1866 | |
1867 | trace_seq_printf(s, "# %lx %s", field->ip, field->buf); | |
1868 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
1869 | trace_seq_print_cont(s, iter); |
1870 | break; | |
f9896bf3 | 1871 | } |
777e208d | 1872 | } |
2c4f035f | 1873 | return TRACE_TYPE_HANDLED; |
f9896bf3 IM |
1874 | } |
1875 | ||
cb0f12aa IM |
1876 | #define SEQ_PUT_FIELD_RET(s, x) \ |
1877 | do { \ | |
1878 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ | |
1879 | return 0; \ | |
1880 | } while (0) | |
1881 | ||
5e3ca0ec IM |
1882 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
1883 | do { \ | |
ad0a3b68 | 1884 | BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES); \ |
5e3ca0ec IM |
1885 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ |
1886 | return 0; \ | |
1887 | } while (0) | |
1888 | ||
2c4f035f | 1889 | static enum print_line_t print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec IM |
1890 | { |
1891 | struct trace_seq *s = &iter->seq; | |
1892 | unsigned char newline = '\n'; | |
1893 | struct trace_entry *entry; | |
bac524d3 | 1894 | int S, T; |
5e3ca0ec IM |
1895 | |
1896 | entry = iter->ent; | |
dd0e545f SR |
1897 | |
1898 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1899 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1900 | |
777e208d | 1901 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); |
5e3ca0ec | 1902 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); |
3928a8a2 | 1903 | SEQ_PUT_HEX_FIELD_RET(s, iter->ts); |
5e3ca0ec IM |
1904 | |
1905 | switch (entry->type) { | |
777e208d | 1906 | case TRACE_FN: { |
7104f300 SR |
1907 | struct ftrace_entry *field; |
1908 | ||
1909 | trace_assign_type(field, entry); | |
777e208d SR |
1910 | |
1911 | SEQ_PUT_HEX_FIELD_RET(s, field->ip); | |
1912 | SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip); | |
5e3ca0ec | 1913 | break; |
777e208d | 1914 | } |
5e3ca0ec | 1915 | case TRACE_CTX: |
777e208d | 1916 | case TRACE_WAKE: { |
7104f300 SR |
1917 | struct ctx_switch_entry *field; |
1918 | ||
1919 | trace_assign_type(field, entry); | |
777e208d SR |
1920 | |
1921 | S = field->prev_state < sizeof(state_to_char) ? | |
1922 | state_to_char[field->prev_state] : 'X'; | |
1923 | T = field->next_state < sizeof(state_to_char) ? | |
1924 | state_to_char[field->next_state] : 'X'; | |
57422797 IM |
1925 | if (entry->type == TRACE_WAKE) |
1926 | S = '+'; | |
777e208d SR |
1927 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid); |
1928 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio); | |
5e3ca0ec | 1929 | SEQ_PUT_HEX_FIELD_RET(s, S); |
777e208d SR |
1930 | SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu); |
1931 | SEQ_PUT_HEX_FIELD_RET(s, field->next_pid); | |
1932 | SEQ_PUT_HEX_FIELD_RET(s, field->next_prio); | |
bac524d3 | 1933 | SEQ_PUT_HEX_FIELD_RET(s, T); |
5e3ca0ec | 1934 | break; |
777e208d | 1935 | } |
5e3ca0ec | 1936 | case TRACE_SPECIAL: |
777e208d | 1937 | case TRACE_STACK: { |
7104f300 SR |
1938 | struct special_entry *field; |
1939 | ||
1940 | trace_assign_type(field, entry); | |
777e208d SR |
1941 | |
1942 | SEQ_PUT_HEX_FIELD_RET(s, field->arg1); | |
1943 | SEQ_PUT_HEX_FIELD_RET(s, field->arg2); | |
1944 | SEQ_PUT_HEX_FIELD_RET(s, field->arg3); | |
5e3ca0ec IM |
1945 | break; |
1946 | } | |
777e208d | 1947 | } |
5e3ca0ec IM |
1948 | SEQ_PUT_FIELD_RET(s, newline); |
1949 | ||
2c4f035f | 1950 | return TRACE_TYPE_HANDLED; |
5e3ca0ec IM |
1951 | } |
1952 | ||
2c4f035f | 1953 | static enum print_line_t print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa IM |
1954 | { |
1955 | struct trace_seq *s = &iter->seq; | |
1956 | struct trace_entry *entry; | |
1957 | ||
1958 | entry = iter->ent; | |
dd0e545f SR |
1959 | |
1960 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1961 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1962 | |
777e208d | 1963 | SEQ_PUT_FIELD_RET(s, entry->pid); |
072ba498 | 1964 | SEQ_PUT_FIELD_RET(s, entry->cpu); |
3928a8a2 | 1965 | SEQ_PUT_FIELD_RET(s, iter->ts); |
cb0f12aa IM |
1966 | |
1967 | switch (entry->type) { | |
777e208d | 1968 | case TRACE_FN: { |
7104f300 SR |
1969 | struct ftrace_entry *field; |
1970 | ||
1971 | trace_assign_type(field, entry); | |
777e208d SR |
1972 | |
1973 | SEQ_PUT_FIELD_RET(s, field->ip); | |
1974 | SEQ_PUT_FIELD_RET(s, field->parent_ip); | |
cb0f12aa | 1975 | break; |
777e208d SR |
1976 | } |
1977 | case TRACE_CTX: { | |
7104f300 SR |
1978 | struct ctx_switch_entry *field; |
1979 | ||
1980 | trace_assign_type(field, entry); | |
777e208d SR |
1981 | |
1982 | SEQ_PUT_FIELD_RET(s, field->prev_pid); | |
1983 | SEQ_PUT_FIELD_RET(s, field->prev_prio); | |
1984 | SEQ_PUT_FIELD_RET(s, field->prev_state); | |
1985 | SEQ_PUT_FIELD_RET(s, field->next_pid); | |
1986 | SEQ_PUT_FIELD_RET(s, field->next_prio); | |
1987 | SEQ_PUT_FIELD_RET(s, field->next_state); | |
cb0f12aa | 1988 | break; |
777e208d | 1989 | } |
f0a920d5 | 1990 | case TRACE_SPECIAL: |
777e208d | 1991 | case TRACE_STACK: { |
7104f300 SR |
1992 | struct special_entry *field; |
1993 | ||
1994 | trace_assign_type(field, entry); | |
777e208d SR |
1995 | |
1996 | SEQ_PUT_FIELD_RET(s, field->arg1); | |
1997 | SEQ_PUT_FIELD_RET(s, field->arg2); | |
1998 | SEQ_PUT_FIELD_RET(s, field->arg3); | |
f0a920d5 | 1999 | break; |
cb0f12aa | 2000 | } |
777e208d | 2001 | } |
cb0f12aa IM |
2002 | return 1; |
2003 | } | |
2004 | ||
bc0c38d1 SR |
2005 | static int trace_empty(struct trace_iterator *iter) |
2006 | { | |
bc0c38d1 SR |
2007 | int cpu; |
2008 | ||
ab46428c | 2009 | for_each_tracing_cpu(cpu) { |
d769041f SR |
2010 | if (iter->buffer_iter[cpu]) { |
2011 | if (!ring_buffer_iter_empty(iter->buffer_iter[cpu])) | |
2012 | return 0; | |
2013 | } else { | |
2014 | if (!ring_buffer_empty_cpu(iter->tr->buffer, cpu)) | |
2015 | return 0; | |
2016 | } | |
bc0c38d1 | 2017 | } |
d769041f | 2018 | |
797d3712 | 2019 | return 1; |
bc0c38d1 SR |
2020 | } |
2021 | ||
2c4f035f | 2022 | static enum print_line_t print_trace_line(struct trace_iterator *iter) |
f9896bf3 | 2023 | { |
2c4f035f FW |
2024 | enum print_line_t ret; |
2025 | ||
2026 | if (iter->trace && iter->trace->print_line) { | |
2027 | ret = iter->trace->print_line(iter); | |
2028 | if (ret != TRACE_TYPE_UNHANDLED) | |
2029 | return ret; | |
2030 | } | |
72829bc3 | 2031 | |
cb0f12aa IM |
2032 | if (trace_flags & TRACE_ITER_BIN) |
2033 | return print_bin_fmt(iter); | |
2034 | ||
5e3ca0ec IM |
2035 | if (trace_flags & TRACE_ITER_HEX) |
2036 | return print_hex_fmt(iter); | |
2037 | ||
f9896bf3 IM |
2038 | if (trace_flags & TRACE_ITER_RAW) |
2039 | return print_raw_fmt(iter); | |
2040 | ||
2041 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
2042 | return print_lat_fmt(iter, iter->idx, iter->cpu); | |
2043 | ||
2044 | return print_trace_fmt(iter); | |
2045 | } | |
2046 | ||
bc0c38d1 SR |
2047 | static int s_show(struct seq_file *m, void *v) |
2048 | { | |
2049 | struct trace_iterator *iter = v; | |
2050 | ||
2051 | if (iter->ent == NULL) { | |
2052 | if (iter->tr) { | |
2053 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
2054 | seq_puts(m, "#\n"); | |
2055 | } | |
2056 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { | |
2057 | /* print nothing if the buffers are empty */ | |
2058 | if (trace_empty(iter)) | |
2059 | return 0; | |
2060 | print_trace_header(m, iter); | |
2061 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
2062 | print_lat_help_header(m); | |
2063 | } else { | |
2064 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
2065 | print_func_help_header(m); | |
2066 | } | |
2067 | } else { | |
f9896bf3 | 2068 | print_trace_line(iter); |
214023c3 | 2069 | trace_print_seq(m, &iter->seq); |
bc0c38d1 SR |
2070 | } |
2071 | ||
2072 | return 0; | |
2073 | } | |
2074 | ||
2075 | static struct seq_operations tracer_seq_ops = { | |
4bf39a94 IM |
2076 | .start = s_start, |
2077 | .next = s_next, | |
2078 | .stop = s_stop, | |
2079 | .show = s_show, | |
bc0c38d1 SR |
2080 | }; |
2081 | ||
e309b41d | 2082 | static struct trace_iterator * |
bc0c38d1 SR |
2083 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
2084 | { | |
2085 | struct trace_iterator *iter; | |
3928a8a2 SR |
2086 | struct seq_file *m; |
2087 | int cpu; | |
bc0c38d1 | 2088 | |
60a11774 SR |
2089 | if (tracing_disabled) { |
2090 | *ret = -ENODEV; | |
2091 | return NULL; | |
2092 | } | |
2093 | ||
bc0c38d1 SR |
2094 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
2095 | if (!iter) { | |
2096 | *ret = -ENOMEM; | |
2097 | goto out; | |
2098 | } | |
2099 | ||
2100 | mutex_lock(&trace_types_lock); | |
2101 | if (current_trace && current_trace->print_max) | |
2102 | iter->tr = &max_tr; | |
2103 | else | |
2104 | iter->tr = inode->i_private; | |
2105 | iter->trace = current_trace; | |
2106 | iter->pos = -1; | |
2107 | ||
3928a8a2 | 2108 | for_each_tracing_cpu(cpu) { |
d769041f | 2109 | |
3928a8a2 SR |
2110 | iter->buffer_iter[cpu] = |
2111 | ring_buffer_read_start(iter->tr->buffer, cpu); | |
d769041f | 2112 | |
3928a8a2 SR |
2113 | if (!iter->buffer_iter[cpu]) |
2114 | goto fail_buffer; | |
2115 | } | |
2116 | ||
bc0c38d1 SR |
2117 | /* TODO stop tracer */ |
2118 | *ret = seq_open(file, &tracer_seq_ops); | |
3928a8a2 SR |
2119 | if (*ret) |
2120 | goto fail_buffer; | |
bc0c38d1 | 2121 | |
3928a8a2 SR |
2122 | m = file->private_data; |
2123 | m->private = iter; | |
bc0c38d1 | 2124 | |
3928a8a2 | 2125 | /* stop the trace while dumping */ |
9036990d | 2126 | tracing_stop(); |
3928a8a2 SR |
2127 | |
2128 | if (iter->trace && iter->trace->open) | |
2129 | iter->trace->open(iter); | |
2130 | ||
bc0c38d1 SR |
2131 | mutex_unlock(&trace_types_lock); |
2132 | ||
2133 | out: | |
2134 | return iter; | |
3928a8a2 SR |
2135 | |
2136 | fail_buffer: | |
2137 | for_each_tracing_cpu(cpu) { | |
2138 | if (iter->buffer_iter[cpu]) | |
2139 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
2140 | } | |
2141 | mutex_unlock(&trace_types_lock); | |
2142 | ||
2143 | return ERR_PTR(-ENOMEM); | |
bc0c38d1 SR |
2144 | } |
2145 | ||
2146 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
2147 | { | |
60a11774 SR |
2148 | if (tracing_disabled) |
2149 | return -ENODEV; | |
2150 | ||
bc0c38d1 SR |
2151 | filp->private_data = inode->i_private; |
2152 | return 0; | |
2153 | } | |
2154 | ||
2155 | int tracing_release(struct inode *inode, struct file *file) | |
2156 | { | |
2157 | struct seq_file *m = (struct seq_file *)file->private_data; | |
2158 | struct trace_iterator *iter = m->private; | |
3928a8a2 | 2159 | int cpu; |
bc0c38d1 SR |
2160 | |
2161 | mutex_lock(&trace_types_lock); | |
3928a8a2 SR |
2162 | for_each_tracing_cpu(cpu) { |
2163 | if (iter->buffer_iter[cpu]) | |
2164 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
2165 | } | |
2166 | ||
bc0c38d1 SR |
2167 | if (iter->trace && iter->trace->close) |
2168 | iter->trace->close(iter); | |
2169 | ||
2170 | /* reenable tracing if it was previously enabled */ | |
9036990d | 2171 | tracing_start(); |
bc0c38d1 SR |
2172 | mutex_unlock(&trace_types_lock); |
2173 | ||
2174 | seq_release(inode, file); | |
2175 | kfree(iter); | |
2176 | return 0; | |
2177 | } | |
2178 | ||
2179 | static int tracing_open(struct inode *inode, struct file *file) | |
2180 | { | |
2181 | int ret; | |
2182 | ||
2183 | __tracing_open(inode, file, &ret); | |
2184 | ||
2185 | return ret; | |
2186 | } | |
2187 | ||
2188 | static int tracing_lt_open(struct inode *inode, struct file *file) | |
2189 | { | |
2190 | struct trace_iterator *iter; | |
2191 | int ret; | |
2192 | ||
2193 | iter = __tracing_open(inode, file, &ret); | |
2194 | ||
2195 | if (!ret) | |
2196 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
2197 | ||
2198 | return ret; | |
2199 | } | |
2200 | ||
2201 | ||
e309b41d | 2202 | static void * |
bc0c38d1 SR |
2203 | t_next(struct seq_file *m, void *v, loff_t *pos) |
2204 | { | |
2205 | struct tracer *t = m->private; | |
2206 | ||
2207 | (*pos)++; | |
2208 | ||
2209 | if (t) | |
2210 | t = t->next; | |
2211 | ||
2212 | m->private = t; | |
2213 | ||
2214 | return t; | |
2215 | } | |
2216 | ||
2217 | static void *t_start(struct seq_file *m, loff_t *pos) | |
2218 | { | |
2219 | struct tracer *t = m->private; | |
2220 | loff_t l = 0; | |
2221 | ||
2222 | mutex_lock(&trace_types_lock); | |
2223 | for (; t && l < *pos; t = t_next(m, t, &l)) | |
2224 | ; | |
2225 | ||
2226 | return t; | |
2227 | } | |
2228 | ||
2229 | static void t_stop(struct seq_file *m, void *p) | |
2230 | { | |
2231 | mutex_unlock(&trace_types_lock); | |
2232 | } | |
2233 | ||
2234 | static int t_show(struct seq_file *m, void *v) | |
2235 | { | |
2236 | struct tracer *t = v; | |
2237 | ||
2238 | if (!t) | |
2239 | return 0; | |
2240 | ||
2241 | seq_printf(m, "%s", t->name); | |
2242 | if (t->next) | |
2243 | seq_putc(m, ' '); | |
2244 | else | |
2245 | seq_putc(m, '\n'); | |
2246 | ||
2247 | return 0; | |
2248 | } | |
2249 | ||
2250 | static struct seq_operations show_traces_seq_ops = { | |
4bf39a94 IM |
2251 | .start = t_start, |
2252 | .next = t_next, | |
2253 | .stop = t_stop, | |
2254 | .show = t_show, | |
bc0c38d1 SR |
2255 | }; |
2256 | ||
2257 | static int show_traces_open(struct inode *inode, struct file *file) | |
2258 | { | |
2259 | int ret; | |
2260 | ||
60a11774 SR |
2261 | if (tracing_disabled) |
2262 | return -ENODEV; | |
2263 | ||
bc0c38d1 SR |
2264 | ret = seq_open(file, &show_traces_seq_ops); |
2265 | if (!ret) { | |
2266 | struct seq_file *m = file->private_data; | |
2267 | m->private = trace_types; | |
2268 | } | |
2269 | ||
2270 | return ret; | |
2271 | } | |
2272 | ||
2273 | static struct file_operations tracing_fops = { | |
4bf39a94 IM |
2274 | .open = tracing_open, |
2275 | .read = seq_read, | |
2276 | .llseek = seq_lseek, | |
2277 | .release = tracing_release, | |
bc0c38d1 SR |
2278 | }; |
2279 | ||
2280 | static struct file_operations tracing_lt_fops = { | |
4bf39a94 IM |
2281 | .open = tracing_lt_open, |
2282 | .read = seq_read, | |
2283 | .llseek = seq_lseek, | |
2284 | .release = tracing_release, | |
bc0c38d1 SR |
2285 | }; |
2286 | ||
2287 | static struct file_operations show_traces_fops = { | |
c7078de1 IM |
2288 | .open = show_traces_open, |
2289 | .read = seq_read, | |
2290 | .release = seq_release, | |
2291 | }; | |
2292 | ||
36dfe925 IM |
2293 | /* |
2294 | * Only trace on a CPU if the bitmask is set: | |
2295 | */ | |
2296 | static cpumask_t tracing_cpumask = CPU_MASK_ALL; | |
2297 | ||
2298 | /* | |
2299 | * When tracing/tracing_cpu_mask is modified then this holds | |
2300 | * the new bitmask we are about to install: | |
2301 | */ | |
2302 | static cpumask_t tracing_cpumask_new; | |
2303 | ||
2304 | /* | |
2305 | * The tracer itself will not take this lock, but still we want | |
2306 | * to provide a consistent cpumask to user-space: | |
2307 | */ | |
2308 | static DEFINE_MUTEX(tracing_cpumask_update_lock); | |
2309 | ||
2310 | /* | |
2311 | * Temporary storage for the character representation of the | |
2312 | * CPU bitmask (and one more byte for the newline): | |
2313 | */ | |
2314 | static char mask_str[NR_CPUS + 1]; | |
2315 | ||
c7078de1 IM |
2316 | static ssize_t |
2317 | tracing_cpumask_read(struct file *filp, char __user *ubuf, | |
2318 | size_t count, loff_t *ppos) | |
2319 | { | |
36dfe925 | 2320 | int len; |
c7078de1 IM |
2321 | |
2322 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 IM |
2323 | |
2324 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); | |
2325 | if (count - len < 2) { | |
2326 | count = -EINVAL; | |
2327 | goto out_err; | |
2328 | } | |
2329 | len += sprintf(mask_str + len, "\n"); | |
2330 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); | |
2331 | ||
2332 | out_err: | |
c7078de1 IM |
2333 | mutex_unlock(&tracing_cpumask_update_lock); |
2334 | ||
2335 | return count; | |
2336 | } | |
2337 | ||
2338 | static ssize_t | |
2339 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, | |
2340 | size_t count, loff_t *ppos) | |
2341 | { | |
36dfe925 | 2342 | int err, cpu; |
c7078de1 IM |
2343 | |
2344 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 | 2345 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
c7078de1 | 2346 | if (err) |
36dfe925 IM |
2347 | goto err_unlock; |
2348 | ||
92205c23 SR |
2349 | raw_local_irq_disable(); |
2350 | __raw_spin_lock(&ftrace_max_lock); | |
ab46428c | 2351 | for_each_tracing_cpu(cpu) { |
36dfe925 IM |
2352 | /* |
2353 | * Increase/decrease the disabled counter if we are | |
2354 | * about to flip a bit in the cpumask: | |
2355 | */ | |
2356 | if (cpu_isset(cpu, tracing_cpumask) && | |
2357 | !cpu_isset(cpu, tracing_cpumask_new)) { | |
2358 | atomic_inc(&global_trace.data[cpu]->disabled); | |
2359 | } | |
2360 | if (!cpu_isset(cpu, tracing_cpumask) && | |
2361 | cpu_isset(cpu, tracing_cpumask_new)) { | |
2362 | atomic_dec(&global_trace.data[cpu]->disabled); | |
2363 | } | |
2364 | } | |
92205c23 SR |
2365 | __raw_spin_unlock(&ftrace_max_lock); |
2366 | raw_local_irq_enable(); | |
36dfe925 IM |
2367 | |
2368 | tracing_cpumask = tracing_cpumask_new; | |
2369 | ||
2370 | mutex_unlock(&tracing_cpumask_update_lock); | |
c7078de1 IM |
2371 | |
2372 | return count; | |
36dfe925 IM |
2373 | |
2374 | err_unlock: | |
2375 | mutex_unlock(&tracing_cpumask_update_lock); | |
2376 | ||
2377 | return err; | |
c7078de1 IM |
2378 | } |
2379 | ||
2380 | static struct file_operations tracing_cpumask_fops = { | |
2381 | .open = tracing_open_generic, | |
2382 | .read = tracing_cpumask_read, | |
2383 | .write = tracing_cpumask_write, | |
bc0c38d1 SR |
2384 | }; |
2385 | ||
2386 | static ssize_t | |
2387 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, | |
2388 | size_t cnt, loff_t *ppos) | |
2389 | { | |
2390 | char *buf; | |
2391 | int r = 0; | |
2392 | int len = 0; | |
2393 | int i; | |
2394 | ||
2395 | /* calulate max size */ | |
2396 | for (i = 0; trace_options[i]; i++) { | |
2397 | len += strlen(trace_options[i]); | |
2398 | len += 3; /* "no" and space */ | |
2399 | } | |
2400 | ||
2401 | /* +2 for \n and \0 */ | |
2402 | buf = kmalloc(len + 2, GFP_KERNEL); | |
2403 | if (!buf) | |
2404 | return -ENOMEM; | |
2405 | ||
2406 | for (i = 0; trace_options[i]; i++) { | |
2407 | if (trace_flags & (1 << i)) | |
2408 | r += sprintf(buf + r, "%s ", trace_options[i]); | |
2409 | else | |
2410 | r += sprintf(buf + r, "no%s ", trace_options[i]); | |
2411 | } | |
2412 | ||
2413 | r += sprintf(buf + r, "\n"); | |
2414 | WARN_ON(r >= len + 2); | |
2415 | ||
36dfe925 | 2416 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2417 | |
2418 | kfree(buf); | |
2419 | ||
2420 | return r; | |
2421 | } | |
2422 | ||
2423 | static ssize_t | |
2424 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, | |
2425 | size_t cnt, loff_t *ppos) | |
2426 | { | |
2427 | char buf[64]; | |
2428 | char *cmp = buf; | |
2429 | int neg = 0; | |
2430 | int i; | |
2431 | ||
cffae437 SR |
2432 | if (cnt >= sizeof(buf)) |
2433 | return -EINVAL; | |
bc0c38d1 SR |
2434 | |
2435 | if (copy_from_user(&buf, ubuf, cnt)) | |
2436 | return -EFAULT; | |
2437 | ||
2438 | buf[cnt] = 0; | |
2439 | ||
2440 | if (strncmp(buf, "no", 2) == 0) { | |
2441 | neg = 1; | |
2442 | cmp += 2; | |
2443 | } | |
2444 | ||
2445 | for (i = 0; trace_options[i]; i++) { | |
2446 | int len = strlen(trace_options[i]); | |
2447 | ||
2448 | if (strncmp(cmp, trace_options[i], len) == 0) { | |
2449 | if (neg) | |
2450 | trace_flags &= ~(1 << i); | |
2451 | else | |
2452 | trace_flags |= (1 << i); | |
2453 | break; | |
2454 | } | |
2455 | } | |
442e544c IM |
2456 | /* |
2457 | * If no option could be set, return an error: | |
2458 | */ | |
2459 | if (!trace_options[i]) | |
2460 | return -EINVAL; | |
bc0c38d1 SR |
2461 | |
2462 | filp->f_pos += cnt; | |
2463 | ||
2464 | return cnt; | |
2465 | } | |
2466 | ||
2467 | static struct file_operations tracing_iter_fops = { | |
c7078de1 IM |
2468 | .open = tracing_open_generic, |
2469 | .read = tracing_iter_ctrl_read, | |
2470 | .write = tracing_iter_ctrl_write, | |
bc0c38d1 SR |
2471 | }; |
2472 | ||
7bd2f24c IM |
2473 | static const char readme_msg[] = |
2474 | "tracing mini-HOWTO:\n\n" | |
2475 | "# mkdir /debug\n" | |
2476 | "# mount -t debugfs nodev /debug\n\n" | |
2477 | "# cat /debug/tracing/available_tracers\n" | |
2478 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" | |
2479 | "# cat /debug/tracing/current_tracer\n" | |
2480 | "none\n" | |
2481 | "# echo sched_switch > /debug/tracing/current_tracer\n" | |
2482 | "# cat /debug/tracing/current_tracer\n" | |
2483 | "sched_switch\n" | |
2484 | "# cat /debug/tracing/iter_ctrl\n" | |
2485 | "noprint-parent nosym-offset nosym-addr noverbose\n" | |
2486 | "# echo print-parent > /debug/tracing/iter_ctrl\n" | |
2487 | "# echo 1 > /debug/tracing/tracing_enabled\n" | |
2488 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" | |
2489 | "echo 0 > /debug/tracing/tracing_enabled\n" | |
2490 | ; | |
2491 | ||
2492 | static ssize_t | |
2493 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
2494 | size_t cnt, loff_t *ppos) | |
2495 | { | |
2496 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
2497 | readme_msg, strlen(readme_msg)); | |
2498 | } | |
2499 | ||
2500 | static struct file_operations tracing_readme_fops = { | |
c7078de1 IM |
2501 | .open = tracing_open_generic, |
2502 | .read = tracing_readme_read, | |
7bd2f24c IM |
2503 | }; |
2504 | ||
bc0c38d1 SR |
2505 | static ssize_t |
2506 | tracing_ctrl_read(struct file *filp, char __user *ubuf, | |
2507 | size_t cnt, loff_t *ppos) | |
2508 | { | |
bc0c38d1 SR |
2509 | char buf[64]; |
2510 | int r; | |
2511 | ||
9036990d | 2512 | r = sprintf(buf, "%u\n", tracer_enabled); |
4e3c3333 | 2513 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2514 | } |
2515 | ||
2516 | static ssize_t | |
2517 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, | |
2518 | size_t cnt, loff_t *ppos) | |
2519 | { | |
2520 | struct trace_array *tr = filp->private_data; | |
bc0c38d1 | 2521 | char buf[64]; |
c6caeeb1 SR |
2522 | long val; |
2523 | int ret; | |
bc0c38d1 | 2524 | |
cffae437 SR |
2525 | if (cnt >= sizeof(buf)) |
2526 | return -EINVAL; | |
bc0c38d1 SR |
2527 | |
2528 | if (copy_from_user(&buf, ubuf, cnt)) | |
2529 | return -EFAULT; | |
2530 | ||
2531 | buf[cnt] = 0; | |
2532 | ||
c6caeeb1 SR |
2533 | ret = strict_strtoul(buf, 10, &val); |
2534 | if (ret < 0) | |
2535 | return ret; | |
bc0c38d1 SR |
2536 | |
2537 | val = !!val; | |
2538 | ||
2539 | mutex_lock(&trace_types_lock); | |
9036990d SR |
2540 | if (tracer_enabled ^ val) { |
2541 | if (val) { | |
bc0c38d1 | 2542 | tracer_enabled = 1; |
9036990d SR |
2543 | if (current_trace->start) |
2544 | current_trace->start(tr); | |
2545 | tracing_start(); | |
2546 | } else { | |
bc0c38d1 | 2547 | tracer_enabled = 0; |
9036990d SR |
2548 | tracing_stop(); |
2549 | if (current_trace->stop) | |
2550 | current_trace->stop(tr); | |
2551 | } | |
bc0c38d1 SR |
2552 | } |
2553 | mutex_unlock(&trace_types_lock); | |
2554 | ||
2555 | filp->f_pos += cnt; | |
2556 | ||
2557 | return cnt; | |
2558 | } | |
2559 | ||
2560 | static ssize_t | |
2561 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
2562 | size_t cnt, loff_t *ppos) | |
2563 | { | |
2564 | char buf[max_tracer_type_len+2]; | |
2565 | int r; | |
2566 | ||
2567 | mutex_lock(&trace_types_lock); | |
2568 | if (current_trace) | |
2569 | r = sprintf(buf, "%s\n", current_trace->name); | |
2570 | else | |
2571 | r = sprintf(buf, "\n"); | |
2572 | mutex_unlock(&trace_types_lock); | |
2573 | ||
4bf39a94 | 2574 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2575 | } |
2576 | ||
d9e54076 | 2577 | static int tracing_set_tracer(char *buf) |
bc0c38d1 SR |
2578 | { |
2579 | struct trace_array *tr = &global_trace; | |
2580 | struct tracer *t; | |
d9e54076 | 2581 | int ret = 0; |
bc0c38d1 SR |
2582 | |
2583 | mutex_lock(&trace_types_lock); | |
2584 | for (t = trace_types; t; t = t->next) { | |
2585 | if (strcmp(t->name, buf) == 0) | |
2586 | break; | |
2587 | } | |
c2931e05 FW |
2588 | if (!t) { |
2589 | ret = -EINVAL; | |
2590 | goto out; | |
2591 | } | |
2592 | if (t == current_trace) | |
bc0c38d1 SR |
2593 | goto out; |
2594 | ||
2595 | if (current_trace && current_trace->reset) | |
2596 | current_trace->reset(tr); | |
2597 | ||
2598 | current_trace = t; | |
2599 | if (t->init) | |
2600 | t->init(tr); | |
2601 | ||
2602 | out: | |
2603 | mutex_unlock(&trace_types_lock); | |
2604 | ||
d9e54076 PZ |
2605 | return ret; |
2606 | } | |
2607 | ||
2608 | static ssize_t | |
2609 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
2610 | size_t cnt, loff_t *ppos) | |
2611 | { | |
2612 | char buf[max_tracer_type_len+1]; | |
2613 | int i; | |
2614 | size_t ret; | |
2615 | ||
2616 | if (cnt > max_tracer_type_len) | |
2617 | cnt = max_tracer_type_len; | |
2618 | ||
2619 | if (copy_from_user(&buf, ubuf, cnt)) | |
2620 | return -EFAULT; | |
2621 | ||
2622 | buf[cnt] = 0; | |
2623 | ||
2624 | /* strip ending whitespace. */ | |
2625 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
2626 | buf[i] = 0; | |
2627 | ||
2628 | ret = tracing_set_tracer(buf); | |
2629 | if (!ret) | |
2630 | ret = cnt; | |
2631 | ||
60063a66 SR |
2632 | if (ret > 0) |
2633 | filp->f_pos += ret; | |
bc0c38d1 | 2634 | |
c2931e05 | 2635 | return ret; |
bc0c38d1 SR |
2636 | } |
2637 | ||
2638 | static ssize_t | |
2639 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
2640 | size_t cnt, loff_t *ppos) | |
2641 | { | |
2642 | unsigned long *ptr = filp->private_data; | |
2643 | char buf[64]; | |
2644 | int r; | |
2645 | ||
cffae437 | 2646 | r = snprintf(buf, sizeof(buf), "%ld\n", |
bc0c38d1 | 2647 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
cffae437 SR |
2648 | if (r > sizeof(buf)) |
2649 | r = sizeof(buf); | |
4bf39a94 | 2650 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2651 | } |
2652 | ||
2653 | static ssize_t | |
2654 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
2655 | size_t cnt, loff_t *ppos) | |
2656 | { | |
2657 | long *ptr = filp->private_data; | |
bc0c38d1 | 2658 | char buf[64]; |
c6caeeb1 SR |
2659 | long val; |
2660 | int ret; | |
bc0c38d1 | 2661 | |
cffae437 SR |
2662 | if (cnt >= sizeof(buf)) |
2663 | return -EINVAL; | |
bc0c38d1 SR |
2664 | |
2665 | if (copy_from_user(&buf, ubuf, cnt)) | |
2666 | return -EFAULT; | |
2667 | ||
2668 | buf[cnt] = 0; | |
2669 | ||
c6caeeb1 SR |
2670 | ret = strict_strtoul(buf, 10, &val); |
2671 | if (ret < 0) | |
2672 | return ret; | |
bc0c38d1 SR |
2673 | |
2674 | *ptr = val * 1000; | |
2675 | ||
2676 | return cnt; | |
2677 | } | |
2678 | ||
b3806b43 SR |
2679 | static atomic_t tracing_reader; |
2680 | ||
2681 | static int tracing_open_pipe(struct inode *inode, struct file *filp) | |
2682 | { | |
2683 | struct trace_iterator *iter; | |
2684 | ||
2685 | if (tracing_disabled) | |
2686 | return -ENODEV; | |
2687 | ||
2688 | /* We only allow for reader of the pipe */ | |
2689 | if (atomic_inc_return(&tracing_reader) != 1) { | |
2690 | atomic_dec(&tracing_reader); | |
2691 | return -EBUSY; | |
2692 | } | |
2693 | ||
2694 | /* create a buffer to store the information to pass to userspace */ | |
2695 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
2696 | if (!iter) | |
2697 | return -ENOMEM; | |
2698 | ||
107bad8b | 2699 | mutex_lock(&trace_types_lock); |
a309720c SR |
2700 | |
2701 | /* trace pipe does not show start of buffer */ | |
2702 | cpus_setall(iter->started); | |
2703 | ||
b3806b43 | 2704 | iter->tr = &global_trace; |
72829bc3 | 2705 | iter->trace = current_trace; |
b3806b43 SR |
2706 | filp->private_data = iter; |
2707 | ||
107bad8b SR |
2708 | if (iter->trace->pipe_open) |
2709 | iter->trace->pipe_open(iter); | |
2710 | mutex_unlock(&trace_types_lock); | |
2711 | ||
b3806b43 SR |
2712 | return 0; |
2713 | } | |
2714 | ||
2715 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
2716 | { | |
2717 | struct trace_iterator *iter = file->private_data; | |
2718 | ||
2719 | kfree(iter); | |
2720 | atomic_dec(&tracing_reader); | |
2721 | ||
2722 | return 0; | |
2723 | } | |
2724 | ||
2a2cc8f7 SSP |
2725 | static unsigned int |
2726 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) | |
2727 | { | |
2728 | struct trace_iterator *iter = filp->private_data; | |
2729 | ||
2730 | if (trace_flags & TRACE_ITER_BLOCK) { | |
2731 | /* | |
2732 | * Always select as readable when in blocking mode | |
2733 | */ | |
2734 | return POLLIN | POLLRDNORM; | |
afc2abc0 | 2735 | } else { |
2a2cc8f7 SSP |
2736 | if (!trace_empty(iter)) |
2737 | return POLLIN | POLLRDNORM; | |
2738 | poll_wait(filp, &trace_wait, poll_table); | |
2739 | if (!trace_empty(iter)) | |
2740 | return POLLIN | POLLRDNORM; | |
2741 | ||
2742 | return 0; | |
2743 | } | |
2744 | } | |
2745 | ||
b3806b43 SR |
2746 | /* |
2747 | * Consumer reader. | |
2748 | */ | |
2749 | static ssize_t | |
2750 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
2751 | size_t cnt, loff_t *ppos) | |
2752 | { | |
2753 | struct trace_iterator *iter = filp->private_data; | |
6c6c2796 | 2754 | ssize_t sret; |
b3806b43 SR |
2755 | |
2756 | /* return any leftover data */ | |
6c6c2796 PP |
2757 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
2758 | if (sret != -EBUSY) | |
2759 | return sret; | |
b3806b43 | 2760 | |
6c6c2796 | 2761 | trace_seq_reset(&iter->seq); |
b3806b43 | 2762 | |
107bad8b SR |
2763 | mutex_lock(&trace_types_lock); |
2764 | if (iter->trace->read) { | |
6c6c2796 PP |
2765 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); |
2766 | if (sret) | |
107bad8b | 2767 | goto out; |
107bad8b SR |
2768 | } |
2769 | ||
9ff4b974 PP |
2770 | waitagain: |
2771 | sret = 0; | |
b3806b43 | 2772 | while (trace_empty(iter)) { |
2dc8f095 | 2773 | |
107bad8b | 2774 | if ((filp->f_flags & O_NONBLOCK)) { |
6c6c2796 | 2775 | sret = -EAGAIN; |
107bad8b SR |
2776 | goto out; |
2777 | } | |
2dc8f095 | 2778 | |
b3806b43 SR |
2779 | /* |
2780 | * This is a make-shift waitqueue. The reason we don't use | |
2781 | * an actual wait queue is because: | |
2782 | * 1) we only ever have one waiter | |
2783 | * 2) the tracing, traces all functions, we don't want | |
2784 | * the overhead of calling wake_up and friends | |
2785 | * (and tracing them too) | |
2786 | * Anyway, this is really very primitive wakeup. | |
2787 | */ | |
2788 | set_current_state(TASK_INTERRUPTIBLE); | |
2789 | iter->tr->waiter = current; | |
2790 | ||
107bad8b SR |
2791 | mutex_unlock(&trace_types_lock); |
2792 | ||
9fe068e9 IM |
2793 | /* sleep for 100 msecs, and try again. */ |
2794 | schedule_timeout(HZ/10); | |
b3806b43 | 2795 | |
107bad8b SR |
2796 | mutex_lock(&trace_types_lock); |
2797 | ||
b3806b43 SR |
2798 | iter->tr->waiter = NULL; |
2799 | ||
107bad8b | 2800 | if (signal_pending(current)) { |
6c6c2796 | 2801 | sret = -EINTR; |
107bad8b SR |
2802 | goto out; |
2803 | } | |
b3806b43 | 2804 | |
84527997 | 2805 | if (iter->trace != current_trace) |
107bad8b | 2806 | goto out; |
84527997 | 2807 | |
b3806b43 SR |
2808 | /* |
2809 | * We block until we read something and tracing is disabled. | |
2810 | * We still block if tracing is disabled, but we have never | |
2811 | * read anything. This allows a user to cat this file, and | |
2812 | * then enable tracing. But after we have read something, | |
2813 | * we give an EOF when tracing is again disabled. | |
2814 | * | |
2815 | * iter->pos will be 0 if we haven't read anything. | |
2816 | */ | |
2817 | if (!tracer_enabled && iter->pos) | |
2818 | break; | |
2819 | ||
2820 | continue; | |
2821 | } | |
2822 | ||
2823 | /* stop when tracing is finished */ | |
2824 | if (trace_empty(iter)) | |
107bad8b | 2825 | goto out; |
b3806b43 SR |
2826 | |
2827 | if (cnt >= PAGE_SIZE) | |
2828 | cnt = PAGE_SIZE - 1; | |
2829 | ||
53d0aa77 | 2830 | /* reset all but tr, trace, and overruns */ |
53d0aa77 SR |
2831 | memset(&iter->seq, 0, |
2832 | sizeof(struct trace_iterator) - | |
2833 | offsetof(struct trace_iterator, seq)); | |
4823ed7e | 2834 | iter->pos = -1; |
b3806b43 | 2835 | |
088b1e42 | 2836 | while (find_next_entry_inc(iter) != NULL) { |
2c4f035f | 2837 | enum print_line_t ret; |
088b1e42 SR |
2838 | int len = iter->seq.len; |
2839 | ||
f9896bf3 | 2840 | ret = print_trace_line(iter); |
2c4f035f | 2841 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
088b1e42 SR |
2842 | /* don't print partial lines */ |
2843 | iter->seq.len = len; | |
b3806b43 | 2844 | break; |
088b1e42 | 2845 | } |
b3806b43 SR |
2846 | |
2847 | trace_consume(iter); | |
2848 | ||
2849 | if (iter->seq.len >= cnt) | |
2850 | break; | |
b3806b43 SR |
2851 | } |
2852 | ||
b3806b43 | 2853 | /* Now copy what we have to the user */ |
6c6c2796 PP |
2854 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
2855 | if (iter->seq.readpos >= iter->seq.len) | |
b3806b43 | 2856 | trace_seq_reset(&iter->seq); |
9ff4b974 PP |
2857 | |
2858 | /* | |
2859 | * If there was nothing to send to user, inspite of consuming trace | |
2860 | * entries, go back to wait for more entries. | |
2861 | */ | |
6c6c2796 | 2862 | if (sret == -EBUSY) |
9ff4b974 | 2863 | goto waitagain; |
b3806b43 | 2864 | |
107bad8b SR |
2865 | out: |
2866 | mutex_unlock(&trace_types_lock); | |
2867 | ||
6c6c2796 | 2868 | return sret; |
b3806b43 SR |
2869 | } |
2870 | ||
a98a3c3f SR |
2871 | static ssize_t |
2872 | tracing_entries_read(struct file *filp, char __user *ubuf, | |
2873 | size_t cnt, loff_t *ppos) | |
2874 | { | |
2875 | struct trace_array *tr = filp->private_data; | |
2876 | char buf[64]; | |
2877 | int r; | |
2878 | ||
2879 | r = sprintf(buf, "%lu\n", tr->entries); | |
2880 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
2881 | } | |
2882 | ||
2883 | static ssize_t | |
2884 | tracing_entries_write(struct file *filp, const char __user *ubuf, | |
2885 | size_t cnt, loff_t *ppos) | |
2886 | { | |
2887 | unsigned long val; | |
2888 | char buf[64]; | |
bf5e6519 | 2889 | int ret, cpu; |
a98a3c3f | 2890 | |
cffae437 SR |
2891 | if (cnt >= sizeof(buf)) |
2892 | return -EINVAL; | |
a98a3c3f SR |
2893 | |
2894 | if (copy_from_user(&buf, ubuf, cnt)) | |
2895 | return -EFAULT; | |
2896 | ||
2897 | buf[cnt] = 0; | |
2898 | ||
c6caeeb1 SR |
2899 | ret = strict_strtoul(buf, 10, &val); |
2900 | if (ret < 0) | |
2901 | return ret; | |
a98a3c3f SR |
2902 | |
2903 | /* must have at least 1 entry */ | |
2904 | if (!val) | |
2905 | return -EINVAL; | |
2906 | ||
2907 | mutex_lock(&trace_types_lock); | |
2908 | ||
c76f0694 | 2909 | tracing_stop(); |
a98a3c3f | 2910 | |
bf5e6519 SR |
2911 | /* disable all cpu buffers */ |
2912 | for_each_tracing_cpu(cpu) { | |
2913 | if (global_trace.data[cpu]) | |
2914 | atomic_inc(&global_trace.data[cpu]->disabled); | |
2915 | if (max_tr.data[cpu]) | |
2916 | atomic_inc(&max_tr.data[cpu]->disabled); | |
2917 | } | |
2918 | ||
3928a8a2 SR |
2919 | if (val != global_trace.entries) { |
2920 | ret = ring_buffer_resize(global_trace.buffer, val); | |
2921 | if (ret < 0) { | |
2922 | cnt = ret; | |
3eefae99 SR |
2923 | goto out; |
2924 | } | |
2925 | ||
3928a8a2 SR |
2926 | ret = ring_buffer_resize(max_tr.buffer, val); |
2927 | if (ret < 0) { | |
2928 | int r; | |
2929 | cnt = ret; | |
2930 | r = ring_buffer_resize(global_trace.buffer, | |
2931 | global_trace.entries); | |
2932 | if (r < 0) { | |
2933 | /* AARGH! We are left with different | |
2934 | * size max buffer!!!! */ | |
2935 | WARN_ON(1); | |
2936 | tracing_disabled = 1; | |
a98a3c3f | 2937 | } |
3928a8a2 | 2938 | goto out; |
a98a3c3f | 2939 | } |
3eefae99 | 2940 | |
3928a8a2 | 2941 | global_trace.entries = val; |
a98a3c3f SR |
2942 | } |
2943 | ||
2944 | filp->f_pos += cnt; | |
2945 | ||
19384c03 SR |
2946 | /* If check pages failed, return ENOMEM */ |
2947 | if (tracing_disabled) | |
2948 | cnt = -ENOMEM; | |
a98a3c3f | 2949 | out: |
bf5e6519 SR |
2950 | for_each_tracing_cpu(cpu) { |
2951 | if (global_trace.data[cpu]) | |
2952 | atomic_dec(&global_trace.data[cpu]->disabled); | |
2953 | if (max_tr.data[cpu]) | |
2954 | atomic_dec(&max_tr.data[cpu]->disabled); | |
2955 | } | |
2956 | ||
c76f0694 | 2957 | tracing_start(); |
a98a3c3f SR |
2958 | max_tr.entries = global_trace.entries; |
2959 | mutex_unlock(&trace_types_lock); | |
2960 | ||
2961 | return cnt; | |
2962 | } | |
2963 | ||
5bf9a1ee PP |
2964 | static int mark_printk(const char *fmt, ...) |
2965 | { | |
2966 | int ret; | |
2967 | va_list args; | |
2968 | va_start(args, fmt); | |
2969 | ret = trace_vprintk(0, fmt, args); | |
2970 | va_end(args); | |
2971 | return ret; | |
2972 | } | |
2973 | ||
2974 | static ssize_t | |
2975 | tracing_mark_write(struct file *filp, const char __user *ubuf, | |
2976 | size_t cnt, loff_t *fpos) | |
2977 | { | |
2978 | char *buf; | |
2979 | char *end; | |
5bf9a1ee | 2980 | |
c76f0694 | 2981 | if (tracing_disabled) |
5bf9a1ee PP |
2982 | return -EINVAL; |
2983 | ||
2984 | if (cnt > TRACE_BUF_SIZE) | |
2985 | cnt = TRACE_BUF_SIZE; | |
2986 | ||
2987 | buf = kmalloc(cnt + 1, GFP_KERNEL); | |
2988 | if (buf == NULL) | |
2989 | return -ENOMEM; | |
2990 | ||
2991 | if (copy_from_user(buf, ubuf, cnt)) { | |
2992 | kfree(buf); | |
2993 | return -EFAULT; | |
2994 | } | |
2995 | ||
2996 | /* Cut from the first nil or newline. */ | |
2997 | buf[cnt] = '\0'; | |
2998 | end = strchr(buf, '\n'); | |
2999 | if (end) | |
3000 | *end = '\0'; | |
3001 | ||
3002 | cnt = mark_printk("%s\n", buf); | |
3003 | kfree(buf); | |
3004 | *fpos += cnt; | |
3005 | ||
3006 | return cnt; | |
3007 | } | |
3008 | ||
bc0c38d1 | 3009 | static struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
3010 | .open = tracing_open_generic, |
3011 | .read = tracing_max_lat_read, | |
3012 | .write = tracing_max_lat_write, | |
bc0c38d1 SR |
3013 | }; |
3014 | ||
3015 | static struct file_operations tracing_ctrl_fops = { | |
4bf39a94 IM |
3016 | .open = tracing_open_generic, |
3017 | .read = tracing_ctrl_read, | |
3018 | .write = tracing_ctrl_write, | |
bc0c38d1 SR |
3019 | }; |
3020 | ||
3021 | static struct file_operations set_tracer_fops = { | |
4bf39a94 IM |
3022 | .open = tracing_open_generic, |
3023 | .read = tracing_set_trace_read, | |
3024 | .write = tracing_set_trace_write, | |
bc0c38d1 SR |
3025 | }; |
3026 | ||
b3806b43 | 3027 | static struct file_operations tracing_pipe_fops = { |
4bf39a94 | 3028 | .open = tracing_open_pipe, |
2a2cc8f7 | 3029 | .poll = tracing_poll_pipe, |
4bf39a94 IM |
3030 | .read = tracing_read_pipe, |
3031 | .release = tracing_release_pipe, | |
b3806b43 SR |
3032 | }; |
3033 | ||
a98a3c3f SR |
3034 | static struct file_operations tracing_entries_fops = { |
3035 | .open = tracing_open_generic, | |
3036 | .read = tracing_entries_read, | |
3037 | .write = tracing_entries_write, | |
3038 | }; | |
3039 | ||
5bf9a1ee | 3040 | static struct file_operations tracing_mark_fops = { |
43a15386 | 3041 | .open = tracing_open_generic, |
5bf9a1ee PP |
3042 | .write = tracing_mark_write, |
3043 | }; | |
3044 | ||
bc0c38d1 SR |
3045 | #ifdef CONFIG_DYNAMIC_FTRACE |
3046 | ||
b807c3d0 SR |
3047 | int __weak ftrace_arch_read_dyn_info(char *buf, int size) |
3048 | { | |
3049 | return 0; | |
3050 | } | |
3051 | ||
bc0c38d1 | 3052 | static ssize_t |
b807c3d0 | 3053 | tracing_read_dyn_info(struct file *filp, char __user *ubuf, |
bc0c38d1 SR |
3054 | size_t cnt, loff_t *ppos) |
3055 | { | |
a26a2a27 SR |
3056 | static char ftrace_dyn_info_buffer[1024]; |
3057 | static DEFINE_MUTEX(dyn_info_mutex); | |
bc0c38d1 | 3058 | unsigned long *p = filp->private_data; |
b807c3d0 | 3059 | char *buf = ftrace_dyn_info_buffer; |
a26a2a27 | 3060 | int size = ARRAY_SIZE(ftrace_dyn_info_buffer); |
bc0c38d1 SR |
3061 | int r; |
3062 | ||
b807c3d0 SR |
3063 | mutex_lock(&dyn_info_mutex); |
3064 | r = sprintf(buf, "%ld ", *p); | |
4bf39a94 | 3065 | |
a26a2a27 | 3066 | r += ftrace_arch_read_dyn_info(buf+r, (size-1)-r); |
b807c3d0 SR |
3067 | buf[r++] = '\n'; |
3068 | ||
3069 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
3070 | ||
3071 | mutex_unlock(&dyn_info_mutex); | |
3072 | ||
3073 | return r; | |
bc0c38d1 SR |
3074 | } |
3075 | ||
b807c3d0 | 3076 | static struct file_operations tracing_dyn_info_fops = { |
4bf39a94 | 3077 | .open = tracing_open_generic, |
b807c3d0 | 3078 | .read = tracing_read_dyn_info, |
bc0c38d1 SR |
3079 | }; |
3080 | #endif | |
3081 | ||
3082 | static struct dentry *d_tracer; | |
3083 | ||
3084 | struct dentry *tracing_init_dentry(void) | |
3085 | { | |
3086 | static int once; | |
3087 | ||
3088 | if (d_tracer) | |
3089 | return d_tracer; | |
3090 | ||
3091 | d_tracer = debugfs_create_dir("tracing", NULL); | |
3092 | ||
3093 | if (!d_tracer && !once) { | |
3094 | once = 1; | |
3095 | pr_warning("Could not create debugfs directory 'tracing'\n"); | |
3096 | return NULL; | |
3097 | } | |
3098 | ||
3099 | return d_tracer; | |
3100 | } | |
3101 | ||
60a11774 SR |
3102 | #ifdef CONFIG_FTRACE_SELFTEST |
3103 | /* Let selftest have access to static functions in this file */ | |
3104 | #include "trace_selftest.c" | |
3105 | #endif | |
3106 | ||
b5ad384e | 3107 | static __init int tracer_init_debugfs(void) |
bc0c38d1 SR |
3108 | { |
3109 | struct dentry *d_tracer; | |
3110 | struct dentry *entry; | |
3111 | ||
3112 | d_tracer = tracing_init_dentry(); | |
3113 | ||
3114 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, | |
3115 | &global_trace, &tracing_ctrl_fops); | |
3116 | if (!entry) | |
3117 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); | |
3118 | ||
3119 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, | |
3120 | NULL, &tracing_iter_fops); | |
3121 | if (!entry) | |
3122 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); | |
3123 | ||
c7078de1 IM |
3124 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
3125 | NULL, &tracing_cpumask_fops); | |
3126 | if (!entry) | |
3127 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); | |
3128 | ||
bc0c38d1 SR |
3129 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
3130 | &global_trace, &tracing_lt_fops); | |
3131 | if (!entry) | |
3132 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); | |
3133 | ||
3134 | entry = debugfs_create_file("trace", 0444, d_tracer, | |
3135 | &global_trace, &tracing_fops); | |
3136 | if (!entry) | |
3137 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
3138 | ||
3139 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, | |
3140 | &global_trace, &show_traces_fops); | |
3141 | if (!entry) | |
98a983aa | 3142 | pr_warning("Could not create debugfs 'available_tracers' entry\n"); |
bc0c38d1 SR |
3143 | |
3144 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, | |
3145 | &global_trace, &set_tracer_fops); | |
3146 | if (!entry) | |
98a983aa | 3147 | pr_warning("Could not create debugfs 'current_tracer' entry\n"); |
bc0c38d1 SR |
3148 | |
3149 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, | |
3150 | &tracing_max_latency, | |
3151 | &tracing_max_lat_fops); | |
3152 | if (!entry) | |
3153 | pr_warning("Could not create debugfs " | |
3154 | "'tracing_max_latency' entry\n"); | |
3155 | ||
3156 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, | |
3157 | &tracing_thresh, &tracing_max_lat_fops); | |
3158 | if (!entry) | |
3159 | pr_warning("Could not create debugfs " | |
98a983aa | 3160 | "'tracing_thresh' entry\n"); |
7bd2f24c IM |
3161 | entry = debugfs_create_file("README", 0644, d_tracer, |
3162 | NULL, &tracing_readme_fops); | |
3163 | if (!entry) | |
3164 | pr_warning("Could not create debugfs 'README' entry\n"); | |
3165 | ||
b3806b43 SR |
3166 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
3167 | NULL, &tracing_pipe_fops); | |
3168 | if (!entry) | |
3169 | pr_warning("Could not create debugfs " | |
98a983aa | 3170 | "'trace_pipe' entry\n"); |
bc0c38d1 | 3171 | |
a98a3c3f SR |
3172 | entry = debugfs_create_file("trace_entries", 0644, d_tracer, |
3173 | &global_trace, &tracing_entries_fops); | |
3174 | if (!entry) | |
3175 | pr_warning("Could not create debugfs " | |
98a983aa | 3176 | "'trace_entries' entry\n"); |
a98a3c3f | 3177 | |
5bf9a1ee PP |
3178 | entry = debugfs_create_file("trace_marker", 0220, d_tracer, |
3179 | NULL, &tracing_mark_fops); | |
3180 | if (!entry) | |
3181 | pr_warning("Could not create debugfs " | |
3182 | "'trace_marker' entry\n"); | |
3183 | ||
bc0c38d1 SR |
3184 | #ifdef CONFIG_DYNAMIC_FTRACE |
3185 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, | |
3186 | &ftrace_update_tot_cnt, | |
b807c3d0 | 3187 | &tracing_dyn_info_fops); |
bc0c38d1 SR |
3188 | if (!entry) |
3189 | pr_warning("Could not create debugfs " | |
3190 | "'dyn_ftrace_total_info' entry\n"); | |
3191 | #endif | |
d618b3e6 IM |
3192 | #ifdef CONFIG_SYSPROF_TRACER |
3193 | init_tracer_sysprof_debugfs(d_tracer); | |
3194 | #endif | |
b5ad384e | 3195 | return 0; |
bc0c38d1 SR |
3196 | } |
3197 | ||
801fe400 | 3198 | int trace_vprintk(unsigned long ip, const char *fmt, va_list args) |
dd0e545f | 3199 | { |
dd0e545f SR |
3200 | static DEFINE_SPINLOCK(trace_buf_lock); |
3201 | static char trace_buf[TRACE_BUF_SIZE]; | |
f09ce573 | 3202 | |
3928a8a2 | 3203 | struct ring_buffer_event *event; |
f09ce573 | 3204 | struct trace_array *tr = &global_trace; |
dd0e545f | 3205 | struct trace_array_cpu *data; |
777e208d | 3206 | struct print_entry *entry; |
3928a8a2 | 3207 | unsigned long flags, irq_flags; |
38697053 | 3208 | int cpu, len = 0, size, pc; |
dd0e545f | 3209 | |
c76f0694 | 3210 | if (tracing_disabled) |
dd0e545f SR |
3211 | return 0; |
3212 | ||
38697053 SR |
3213 | pc = preempt_count(); |
3214 | preempt_disable_notrace(); | |
dd0e545f SR |
3215 | cpu = raw_smp_processor_id(); |
3216 | data = tr->data[cpu]; | |
dd0e545f | 3217 | |
3ea2e6d7 | 3218 | if (unlikely(atomic_read(&data->disabled))) |
dd0e545f SR |
3219 | goto out; |
3220 | ||
38697053 | 3221 | spin_lock_irqsave(&trace_buf_lock, flags); |
801fe400 | 3222 | len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args); |
dd0e545f SR |
3223 | |
3224 | len = min(len, TRACE_BUF_SIZE-1); | |
3225 | trace_buf[len] = 0; | |
3226 | ||
777e208d SR |
3227 | size = sizeof(*entry) + len + 1; |
3228 | event = ring_buffer_lock_reserve(tr->buffer, size, &irq_flags); | |
3928a8a2 SR |
3229 | if (!event) |
3230 | goto out_unlock; | |
777e208d | 3231 | entry = ring_buffer_event_data(event); |
38697053 | 3232 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
3233 | entry->ent.type = TRACE_PRINT; |
3234 | entry->ip = ip; | |
dd0e545f | 3235 | |
777e208d SR |
3236 | memcpy(&entry->buf, trace_buf, len); |
3237 | entry->buf[len] = 0; | |
3928a8a2 | 3238 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
dd0e545f | 3239 | |
3928a8a2 | 3240 | out_unlock: |
38697053 | 3241 | spin_unlock_irqrestore(&trace_buf_lock, flags); |
dd0e545f SR |
3242 | |
3243 | out: | |
38697053 | 3244 | preempt_enable_notrace(); |
dd0e545f SR |
3245 | |
3246 | return len; | |
3247 | } | |
801fe400 PP |
3248 | EXPORT_SYMBOL_GPL(trace_vprintk); |
3249 | ||
3250 | int __ftrace_printk(unsigned long ip, const char *fmt, ...) | |
3251 | { | |
3252 | int ret; | |
3253 | va_list ap; | |
3254 | ||
3255 | if (!(trace_flags & TRACE_ITER_PRINTK)) | |
3256 | return 0; | |
3257 | ||
3258 | va_start(ap, fmt); | |
3259 | ret = trace_vprintk(ip, fmt, ap); | |
3260 | va_end(ap); | |
3261 | return ret; | |
3262 | } | |
dd0e545f SR |
3263 | EXPORT_SYMBOL_GPL(__ftrace_printk); |
3264 | ||
3f5a54e3 SR |
3265 | static int trace_panic_handler(struct notifier_block *this, |
3266 | unsigned long event, void *unused) | |
3267 | { | |
944ac425 SR |
3268 | if (ftrace_dump_on_oops) |
3269 | ftrace_dump(); | |
3f5a54e3 SR |
3270 | return NOTIFY_OK; |
3271 | } | |
3272 | ||
3273 | static struct notifier_block trace_panic_notifier = { | |
3274 | .notifier_call = trace_panic_handler, | |
3275 | .next = NULL, | |
3276 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ | |
3277 | }; | |
3278 | ||
3279 | static int trace_die_handler(struct notifier_block *self, | |
3280 | unsigned long val, | |
3281 | void *data) | |
3282 | { | |
3283 | switch (val) { | |
3284 | case DIE_OOPS: | |
944ac425 SR |
3285 | if (ftrace_dump_on_oops) |
3286 | ftrace_dump(); | |
3f5a54e3 SR |
3287 | break; |
3288 | default: | |
3289 | break; | |
3290 | } | |
3291 | return NOTIFY_OK; | |
3292 | } | |
3293 | ||
3294 | static struct notifier_block trace_die_notifier = { | |
3295 | .notifier_call = trace_die_handler, | |
3296 | .priority = 200 | |
3297 | }; | |
3298 | ||
3299 | /* | |
3300 | * printk is set to max of 1024, we really don't need it that big. | |
3301 | * Nothing should be printing 1000 characters anyway. | |
3302 | */ | |
3303 | #define TRACE_MAX_PRINT 1000 | |
3304 | ||
3305 | /* | |
3306 | * Define here KERN_TRACE so that we have one place to modify | |
3307 | * it if we decide to change what log level the ftrace dump | |
3308 | * should be at. | |
3309 | */ | |
3310 | #define KERN_TRACE KERN_INFO | |
3311 | ||
3312 | static void | |
3313 | trace_printk_seq(struct trace_seq *s) | |
3314 | { | |
3315 | /* Probably should print a warning here. */ | |
3316 | if (s->len >= 1000) | |
3317 | s->len = 1000; | |
3318 | ||
3319 | /* should be zero ended, but we are paranoid. */ | |
3320 | s->buffer[s->len] = 0; | |
3321 | ||
3322 | printk(KERN_TRACE "%s", s->buffer); | |
3323 | ||
3324 | trace_seq_reset(s); | |
3325 | } | |
3326 | ||
3f5a54e3 SR |
3327 | void ftrace_dump(void) |
3328 | { | |
3329 | static DEFINE_SPINLOCK(ftrace_dump_lock); | |
3330 | /* use static because iter can be a bit big for the stack */ | |
3331 | static struct trace_iterator iter; | |
3f5a54e3 SR |
3332 | static cpumask_t mask; |
3333 | static int dump_ran; | |
d769041f SR |
3334 | unsigned long flags; |
3335 | int cnt = 0, cpu; | |
3f5a54e3 SR |
3336 | |
3337 | /* only one dump */ | |
3338 | spin_lock_irqsave(&ftrace_dump_lock, flags); | |
3339 | if (dump_ran) | |
3340 | goto out; | |
3341 | ||
3342 | dump_ran = 1; | |
3343 | ||
3344 | /* No turning back! */ | |
81adbdc0 | 3345 | ftrace_kill(); |
3f5a54e3 | 3346 | |
d769041f SR |
3347 | for_each_tracing_cpu(cpu) { |
3348 | atomic_inc(&global_trace.data[cpu]->disabled); | |
3349 | } | |
3350 | ||
3f5a54e3 SR |
3351 | printk(KERN_TRACE "Dumping ftrace buffer:\n"); |
3352 | ||
3353 | iter.tr = &global_trace; | |
3354 | iter.trace = current_trace; | |
3355 | ||
3356 | /* | |
3357 | * We need to stop all tracing on all CPUS to read the | |
3358 | * the next buffer. This is a bit expensive, but is | |
3359 | * not done often. We fill all what we can read, | |
3360 | * and then release the locks again. | |
3361 | */ | |
3362 | ||
3363 | cpus_clear(mask); | |
3364 | ||
3f5a54e3 SR |
3365 | while (!trace_empty(&iter)) { |
3366 | ||
3367 | if (!cnt) | |
3368 | printk(KERN_TRACE "---------------------------------\n"); | |
3369 | ||
3370 | cnt++; | |
3371 | ||
3372 | /* reset all but tr, trace, and overruns */ | |
3373 | memset(&iter.seq, 0, | |
3374 | sizeof(struct trace_iterator) - | |
3375 | offsetof(struct trace_iterator, seq)); | |
3376 | iter.iter_flags |= TRACE_FILE_LAT_FMT; | |
3377 | iter.pos = -1; | |
3378 | ||
3379 | if (find_next_entry_inc(&iter) != NULL) { | |
3380 | print_trace_line(&iter); | |
3381 | trace_consume(&iter); | |
3382 | } | |
3383 | ||
3384 | trace_printk_seq(&iter.seq); | |
3385 | } | |
3386 | ||
3387 | if (!cnt) | |
3388 | printk(KERN_TRACE " (ftrace buffer empty)\n"); | |
3389 | else | |
3390 | printk(KERN_TRACE "---------------------------------\n"); | |
3391 | ||
3f5a54e3 SR |
3392 | out: |
3393 | spin_unlock_irqrestore(&ftrace_dump_lock, flags); | |
3394 | } | |
3395 | ||
3928a8a2 | 3396 | __init static int tracer_alloc_buffers(void) |
bc0c38d1 | 3397 | { |
4c11d7ae | 3398 | struct trace_array_cpu *data; |
4c11d7ae SR |
3399 | int i; |
3400 | ||
3928a8a2 SR |
3401 | /* TODO: make the number of buffers hot pluggable with CPUS */ |
3402 | tracing_buffer_mask = cpu_possible_map; | |
4c11d7ae | 3403 | |
3928a8a2 SR |
3404 | global_trace.buffer = ring_buffer_alloc(trace_buf_size, |
3405 | TRACE_BUFFER_FLAGS); | |
3406 | if (!global_trace.buffer) { | |
3407 | printk(KERN_ERR "tracer: failed to allocate ring buffer!\n"); | |
3408 | WARN_ON(1); | |
3409 | return 0; | |
4c11d7ae | 3410 | } |
3928a8a2 | 3411 | global_trace.entries = ring_buffer_size(global_trace.buffer); |
4c11d7ae SR |
3412 | |
3413 | #ifdef CONFIG_TRACER_MAX_TRACE | |
3928a8a2 SR |
3414 | max_tr.buffer = ring_buffer_alloc(trace_buf_size, |
3415 | TRACE_BUFFER_FLAGS); | |
3416 | if (!max_tr.buffer) { | |
3417 | printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n"); | |
3418 | WARN_ON(1); | |
3419 | ring_buffer_free(global_trace.buffer); | |
3420 | return 0; | |
4c11d7ae | 3421 | } |
3928a8a2 SR |
3422 | max_tr.entries = ring_buffer_size(max_tr.buffer); |
3423 | WARN_ON(max_tr.entries != global_trace.entries); | |
a98a3c3f | 3424 | #endif |
ab46428c | 3425 | |
4c11d7ae | 3426 | /* Allocate the first page for all buffers */ |
ab46428c | 3427 | for_each_tracing_cpu(i) { |
4c11d7ae | 3428 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
bc0c38d1 | 3429 | max_tr.data[i] = &per_cpu(max_data, i); |
4c11d7ae | 3430 | } |
bc0c38d1 | 3431 | |
bc0c38d1 SR |
3432 | trace_init_cmdlines(); |
3433 | ||
43a15386 | 3434 | register_tracer(&nop_trace); |
b5ad384e FW |
3435 | #ifdef CONFIG_BOOT_TRACER |
3436 | register_tracer(&boot_tracer); | |
3437 | current_trace = &boot_tracer; | |
3438 | current_trace->init(&global_trace); | |
3439 | #else | |
43a15386 | 3440 | current_trace = &nop_trace; |
b5ad384e | 3441 | #endif |
bc0c38d1 | 3442 | |
60a11774 SR |
3443 | /* All seems OK, enable tracing */ |
3444 | tracing_disabled = 0; | |
3928a8a2 | 3445 | |
3f5a54e3 SR |
3446 | atomic_notifier_chain_register(&panic_notifier_list, |
3447 | &trace_panic_notifier); | |
3448 | ||
3449 | register_die_notifier(&trace_die_notifier); | |
3450 | ||
bc0c38d1 | 3451 | return 0; |
bc0c38d1 | 3452 | } |
b5ad384e FW |
3453 | early_initcall(tracer_alloc_buffers); |
3454 | fs_initcall(tracer_init_debugfs); |