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