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 | ||
adf9f195 FW |
46 | /* For tracers that don't implement custom flags */ |
47 | static struct tracer_opt dummy_tracer_opt[] = { | |
48 | { } | |
49 | }; | |
50 | ||
51 | static struct tracer_flags dummy_tracer_flags = { | |
52 | .val = 0, | |
53 | .opts = dummy_tracer_opt | |
54 | }; | |
55 | ||
56 | static int dummy_set_flag(u32 old_flags, u32 bit, int set) | |
57 | { | |
58 | return 0; | |
59 | } | |
0f048701 SR |
60 | |
61 | /* | |
62 | * Kill all tracing for good (never come back). | |
63 | * It is initialized to 1 but will turn to zero if the initialization | |
64 | * of the tracer is successful. But that is the only place that sets | |
65 | * this back to zero. | |
66 | */ | |
67 | int tracing_disabled = 1; | |
68 | ||
d769041f SR |
69 | static DEFINE_PER_CPU(local_t, ftrace_cpu_disabled); |
70 | ||
71 | static inline void ftrace_disable_cpu(void) | |
72 | { | |
73 | preempt_disable(); | |
74 | local_inc(&__get_cpu_var(ftrace_cpu_disabled)); | |
75 | } | |
76 | ||
77 | static inline void ftrace_enable_cpu(void) | |
78 | { | |
79 | local_dec(&__get_cpu_var(ftrace_cpu_disabled)); | |
80 | preempt_enable(); | |
81 | } | |
82 | ||
ab46428c SR |
83 | static cpumask_t __read_mostly tracing_buffer_mask; |
84 | ||
85 | #define for_each_tracing_cpu(cpu) \ | |
86 | for_each_cpu_mask(cpu, tracing_buffer_mask) | |
87 | ||
944ac425 SR |
88 | /* |
89 | * ftrace_dump_on_oops - variable to dump ftrace buffer on oops | |
90 | * | |
91 | * If there is an oops (or kernel panic) and the ftrace_dump_on_oops | |
92 | * is set, then ftrace_dump is called. This will output the contents | |
93 | * of the ftrace buffers to the console. This is very useful for | |
94 | * capturing traces that lead to crashes and outputing it to a | |
95 | * serial console. | |
96 | * | |
97 | * It is default off, but you can enable it with either specifying | |
98 | * "ftrace_dump_on_oops" in the kernel command line, or setting | |
99 | * /proc/sys/kernel/ftrace_dump_on_oops to true. | |
100 | */ | |
101 | int ftrace_dump_on_oops; | |
102 | ||
d9e54076 PZ |
103 | static int tracing_set_tracer(char *buf); |
104 | ||
105 | static int __init set_ftrace(char *str) | |
106 | { | |
107 | tracing_set_tracer(str); | |
108 | return 1; | |
109 | } | |
110 | __setup("ftrace", set_ftrace); | |
111 | ||
944ac425 SR |
112 | static int __init set_ftrace_dump_on_oops(char *str) |
113 | { | |
114 | ftrace_dump_on_oops = 1; | |
115 | return 1; | |
116 | } | |
117 | __setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops); | |
118 | ||
72829bc3 | 119 | long |
bc0c38d1 SR |
120 | ns2usecs(cycle_t nsec) |
121 | { | |
122 | nsec += 500; | |
123 | do_div(nsec, 1000); | |
124 | return nsec; | |
125 | } | |
126 | ||
e309b41d | 127 | cycle_t ftrace_now(int cpu) |
750ed1a4 | 128 | { |
3928a8a2 SR |
129 | u64 ts = ring_buffer_time_stamp(cpu); |
130 | ring_buffer_normalize_time_stamp(cpu, &ts); | |
131 | return ts; | |
750ed1a4 IM |
132 | } |
133 | ||
4fcdae83 SR |
134 | /* |
135 | * The global_trace is the descriptor that holds the tracing | |
136 | * buffers for the live tracing. For each CPU, it contains | |
137 | * a link list of pages that will store trace entries. The | |
138 | * page descriptor of the pages in the memory is used to hold | |
139 | * the link list by linking the lru item in the page descriptor | |
140 | * to each of the pages in the buffer per CPU. | |
141 | * | |
142 | * For each active CPU there is a data field that holds the | |
143 | * pages for the buffer for that CPU. Each CPU has the same number | |
144 | * of pages allocated for its buffer. | |
145 | */ | |
bc0c38d1 SR |
146 | static struct trace_array global_trace; |
147 | ||
148 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); | |
149 | ||
4fcdae83 SR |
150 | /* |
151 | * The max_tr is used to snapshot the global_trace when a maximum | |
152 | * latency is reached. Some tracers will use this to store a maximum | |
153 | * trace while it continues examining live traces. | |
154 | * | |
155 | * The buffers for the max_tr are set up the same as the global_trace. | |
156 | * When a snapshot is taken, the link list of the max_tr is swapped | |
157 | * with the link list of the global_trace and the buffers are reset for | |
158 | * the global_trace so the tracing can continue. | |
159 | */ | |
bc0c38d1 SR |
160 | static struct trace_array max_tr; |
161 | ||
162 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); | |
163 | ||
4fcdae83 | 164 | /* tracer_enabled is used to toggle activation of a tracer */ |
26994ead | 165 | static int tracer_enabled = 1; |
4fcdae83 | 166 | |
9036990d SR |
167 | /** |
168 | * tracing_is_enabled - return tracer_enabled status | |
169 | * | |
170 | * This function is used by other tracers to know the status | |
171 | * of the tracer_enabled flag. Tracers may use this function | |
172 | * to know if it should enable their features when starting | |
173 | * up. See irqsoff tracer for an example (start_irqsoff_tracer). | |
174 | */ | |
175 | int tracing_is_enabled(void) | |
176 | { | |
177 | return tracer_enabled; | |
178 | } | |
179 | ||
60bc0800 SR |
180 | /* function tracing enabled */ |
181 | int ftrace_function_enabled; | |
182 | ||
4fcdae83 | 183 | /* |
3928a8a2 SR |
184 | * trace_buf_size is the size in bytes that is allocated |
185 | * for a buffer. Note, the number of bytes is always rounded | |
186 | * to page size. | |
3f5a54e3 SR |
187 | * |
188 | * This number is purposely set to a low number of 16384. | |
189 | * If the dump on oops happens, it will be much appreciated | |
190 | * to not have to wait for all that output. Anyway this can be | |
191 | * boot time and run time configurable. | |
4fcdae83 | 192 | */ |
3928a8a2 | 193 | #define TRACE_BUF_SIZE_DEFAULT 1441792UL /* 16384 * 88 (sizeof(entry)) */ |
3f5a54e3 | 194 | |
3928a8a2 | 195 | static unsigned long trace_buf_size = TRACE_BUF_SIZE_DEFAULT; |
bc0c38d1 | 196 | |
4fcdae83 | 197 | /* trace_types holds a link list of available tracers. */ |
bc0c38d1 | 198 | static struct tracer *trace_types __read_mostly; |
4fcdae83 SR |
199 | |
200 | /* current_trace points to the tracer that is currently active */ | |
bc0c38d1 | 201 | static struct tracer *current_trace __read_mostly; |
4fcdae83 SR |
202 | |
203 | /* | |
204 | * max_tracer_type_len is used to simplify the allocating of | |
205 | * buffers to read userspace tracer names. We keep track of | |
206 | * the longest tracer name registered. | |
207 | */ | |
bc0c38d1 SR |
208 | static int max_tracer_type_len; |
209 | ||
4fcdae83 SR |
210 | /* |
211 | * trace_types_lock is used to protect the trace_types list. | |
212 | * This lock is also used to keep user access serialized. | |
213 | * Accesses from userspace will grab this lock while userspace | |
214 | * activities happen inside the kernel. | |
215 | */ | |
bc0c38d1 | 216 | static DEFINE_MUTEX(trace_types_lock); |
4fcdae83 SR |
217 | |
218 | /* trace_wait is a waitqueue for tasks blocked on trace_poll */ | |
4e655519 IM |
219 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
220 | ||
ee6bce52 | 221 | /* trace_flags holds trace_options default values */ |
12ef7d44 SR |
222 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK | |
223 | TRACE_ITER_ANNOTATE; | |
4e655519 | 224 | |
4fcdae83 SR |
225 | /** |
226 | * trace_wake_up - wake up tasks waiting for trace input | |
227 | * | |
228 | * Simply wakes up any task that is blocked on the trace_wait | |
229 | * queue. These is used with trace_poll for tasks polling the trace. | |
230 | */ | |
4e655519 IM |
231 | void trace_wake_up(void) |
232 | { | |
017730c1 IM |
233 | /* |
234 | * The runqueue_is_locked() can fail, but this is the best we | |
235 | * have for now: | |
236 | */ | |
237 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) | |
4e655519 IM |
238 | wake_up(&trace_wait); |
239 | } | |
bc0c38d1 | 240 | |
3928a8a2 | 241 | static int __init set_buf_size(char *str) |
bc0c38d1 | 242 | { |
3928a8a2 | 243 | unsigned long buf_size; |
c6caeeb1 SR |
244 | int ret; |
245 | ||
bc0c38d1 SR |
246 | if (!str) |
247 | return 0; | |
3928a8a2 | 248 | ret = strict_strtoul(str, 0, &buf_size); |
c6caeeb1 | 249 | /* nr_entries can not be zero */ |
3928a8a2 | 250 | if (ret < 0 || buf_size == 0) |
c6caeeb1 | 251 | return 0; |
3928a8a2 | 252 | trace_buf_size = buf_size; |
bc0c38d1 SR |
253 | return 1; |
254 | } | |
3928a8a2 | 255 | __setup("trace_buf_size=", set_buf_size); |
bc0c38d1 | 256 | |
57f50be1 SR |
257 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
258 | { | |
259 | return nsecs / 1000; | |
260 | } | |
261 | ||
4fcdae83 | 262 | /* These must match the bit postions in trace_iterator_flags */ |
bc0c38d1 SR |
263 | static const char *trace_options[] = { |
264 | "print-parent", | |
265 | "sym-offset", | |
266 | "sym-addr", | |
267 | "verbose", | |
f9896bf3 | 268 | "raw", |
5e3ca0ec | 269 | "hex", |
cb0f12aa | 270 | "bin", |
2a2cc8f7 | 271 | "block", |
86387f7e | 272 | "stacktrace", |
4ac3ba41 | 273 | "sched-tree", |
f09ce573 | 274 | "ftrace_printk", |
b2a866f9 | 275 | "ftrace_preempt", |
9f029e83 | 276 | "branch", |
12ef7d44 | 277 | "annotate", |
bc0c38d1 SR |
278 | NULL |
279 | }; | |
280 | ||
4fcdae83 SR |
281 | /* |
282 | * ftrace_max_lock is used to protect the swapping of buffers | |
283 | * when taking a max snapshot. The buffers themselves are | |
284 | * protected by per_cpu spinlocks. But the action of the swap | |
285 | * needs its own lock. | |
286 | * | |
287 | * This is defined as a raw_spinlock_t in order to help | |
288 | * with performance when lockdep debugging is enabled. | |
289 | */ | |
92205c23 SR |
290 | static raw_spinlock_t ftrace_max_lock = |
291 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; | |
bc0c38d1 SR |
292 | |
293 | /* | |
294 | * Copy the new maximum trace into the separate maximum-trace | |
295 | * structure. (this way the maximum trace is permanently saved, | |
296 | * for later retrieval via /debugfs/tracing/latency_trace) | |
297 | */ | |
e309b41d | 298 | static void |
bc0c38d1 SR |
299 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
300 | { | |
301 | struct trace_array_cpu *data = tr->data[cpu]; | |
302 | ||
303 | max_tr.cpu = cpu; | |
304 | max_tr.time_start = data->preempt_timestamp; | |
305 | ||
306 | data = max_tr.data[cpu]; | |
307 | data->saved_latency = tracing_max_latency; | |
308 | ||
309 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); | |
310 | data->pid = tsk->pid; | |
311 | data->uid = tsk->uid; | |
312 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; | |
313 | data->policy = tsk->policy; | |
314 | data->rt_priority = tsk->rt_priority; | |
315 | ||
316 | /* record this tasks comm */ | |
317 | tracing_record_cmdline(current); | |
318 | } | |
319 | ||
4fcdae83 SR |
320 | /** |
321 | * trace_seq_printf - sequence printing of trace information | |
322 | * @s: trace sequence descriptor | |
323 | * @fmt: printf format string | |
324 | * | |
325 | * The tracer may use either sequence operations or its own | |
326 | * copy to user routines. To simplify formating of a trace | |
327 | * trace_seq_printf is used to store strings into a special | |
328 | * buffer (@s). Then the output may be either used by | |
329 | * the sequencer or pulled into another buffer. | |
330 | */ | |
72829bc3 | 331 | int |
214023c3 SR |
332 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
333 | { | |
334 | int len = (PAGE_SIZE - 1) - s->len; | |
335 | va_list ap; | |
b3806b43 | 336 | int ret; |
214023c3 SR |
337 | |
338 | if (!len) | |
339 | return 0; | |
340 | ||
341 | va_start(ap, fmt); | |
b3806b43 | 342 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
214023c3 SR |
343 | va_end(ap); |
344 | ||
b3806b43 | 345 | /* If we can't write it all, don't bother writing anything */ |
72829bc3 | 346 | if (ret >= len) |
b3806b43 SR |
347 | return 0; |
348 | ||
349 | s->len += ret; | |
214023c3 SR |
350 | |
351 | return len; | |
352 | } | |
353 | ||
4fcdae83 SR |
354 | /** |
355 | * trace_seq_puts - trace sequence printing of simple string | |
356 | * @s: trace sequence descriptor | |
357 | * @str: simple string to record | |
358 | * | |
359 | * The tracer may use either the sequence operations or its own | |
360 | * copy to user routines. This function records a simple string | |
361 | * into a special buffer (@s) for later retrieval by a sequencer | |
362 | * or other mechanism. | |
363 | */ | |
e309b41d | 364 | static int |
214023c3 SR |
365 | trace_seq_puts(struct trace_seq *s, const char *str) |
366 | { | |
367 | int len = strlen(str); | |
368 | ||
369 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
b3806b43 | 370 | return 0; |
214023c3 SR |
371 | |
372 | memcpy(s->buffer + s->len, str, len); | |
373 | s->len += len; | |
374 | ||
375 | return len; | |
376 | } | |
377 | ||
e309b41d | 378 | static int |
214023c3 SR |
379 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
380 | { | |
381 | if (s->len >= (PAGE_SIZE - 1)) | |
382 | return 0; | |
383 | ||
384 | s->buffer[s->len++] = c; | |
385 | ||
386 | return 1; | |
387 | } | |
388 | ||
e309b41d | 389 | static int |
cb0f12aa IM |
390 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
391 | { | |
392 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
393 | return 0; | |
394 | ||
395 | memcpy(s->buffer + s->len, mem, len); | |
396 | s->len += len; | |
397 | ||
398 | return len; | |
399 | } | |
400 | ||
ad0a3b68 HH |
401 | #define MAX_MEMHEX_BYTES 8 |
402 | #define HEX_CHARS (MAX_MEMHEX_BYTES*2 + 1) | |
5e3ca0ec | 403 | |
e309b41d | 404 | static int |
5e3ca0ec IM |
405 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
406 | { | |
407 | unsigned char hex[HEX_CHARS]; | |
93dcc6ea | 408 | unsigned char *data = mem; |
5e3ca0ec IM |
409 | int i, j; |
410 | ||
5e3ca0ec IM |
411 | #ifdef __BIG_ENDIAN |
412 | for (i = 0, j = 0; i < len; i++) { | |
413 | #else | |
414 | for (i = len-1, j = 0; i >= 0; i--) { | |
415 | #endif | |
2fbc4749 HH |
416 | hex[j++] = hex_asc_hi(data[i]); |
417 | hex[j++] = hex_asc_lo(data[i]); | |
5e3ca0ec | 418 | } |
93dcc6ea | 419 | hex[j++] = ' '; |
5e3ca0ec IM |
420 | |
421 | return trace_seq_putmem(s, hex, j); | |
422 | } | |
423 | ||
e309b41d | 424 | static void |
214023c3 SR |
425 | trace_seq_reset(struct trace_seq *s) |
426 | { | |
427 | s->len = 0; | |
6c6c2796 PP |
428 | s->readpos = 0; |
429 | } | |
430 | ||
431 | ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) | |
432 | { | |
433 | int len; | |
434 | int ret; | |
435 | ||
436 | if (s->len <= s->readpos) | |
437 | return -EBUSY; | |
438 | ||
439 | len = s->len - s->readpos; | |
440 | if (cnt > len) | |
441 | cnt = len; | |
442 | ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); | |
443 | if (ret) | |
444 | return -EFAULT; | |
445 | ||
446 | s->readpos += len; | |
447 | return cnt; | |
214023c3 SR |
448 | } |
449 | ||
e309b41d | 450 | static void |
214023c3 SR |
451 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
452 | { | |
453 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; | |
454 | ||
455 | s->buffer[len] = 0; | |
456 | seq_puts(m, s->buffer); | |
457 | ||
458 | trace_seq_reset(s); | |
459 | } | |
460 | ||
4fcdae83 SR |
461 | /** |
462 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr | |
463 | * @tr: tracer | |
464 | * @tsk: the task with the latency | |
465 | * @cpu: The cpu that initiated the trace. | |
466 | * | |
467 | * Flip the buffers between the @tr and the max_tr and record information | |
468 | * about which task was the cause of this latency. | |
469 | */ | |
e309b41d | 470 | void |
bc0c38d1 SR |
471 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
472 | { | |
3928a8a2 | 473 | struct ring_buffer *buf = tr->buffer; |
bc0c38d1 | 474 | |
4c11d7ae | 475 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 476 | __raw_spin_lock(&ftrace_max_lock); |
3928a8a2 SR |
477 | |
478 | tr->buffer = max_tr.buffer; | |
479 | max_tr.buffer = buf; | |
480 | ||
d769041f | 481 | ftrace_disable_cpu(); |
3928a8a2 | 482 | ring_buffer_reset(tr->buffer); |
d769041f | 483 | ftrace_enable_cpu(); |
bc0c38d1 SR |
484 | |
485 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 486 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
487 | } |
488 | ||
489 | /** | |
490 | * update_max_tr_single - only copy one trace over, and reset the rest | |
491 | * @tr - tracer | |
492 | * @tsk - task with the latency | |
493 | * @cpu - the cpu of the buffer to copy. | |
4fcdae83 SR |
494 | * |
495 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. | |
bc0c38d1 | 496 | */ |
e309b41d | 497 | void |
bc0c38d1 SR |
498 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
499 | { | |
3928a8a2 | 500 | int ret; |
bc0c38d1 | 501 | |
4c11d7ae | 502 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 503 | __raw_spin_lock(&ftrace_max_lock); |
bc0c38d1 | 504 | |
d769041f SR |
505 | ftrace_disable_cpu(); |
506 | ||
3928a8a2 SR |
507 | ring_buffer_reset(max_tr.buffer); |
508 | ret = ring_buffer_swap_cpu(max_tr.buffer, tr->buffer, cpu); | |
509 | ||
d769041f SR |
510 | ftrace_enable_cpu(); |
511 | ||
3928a8a2 | 512 | WARN_ON_ONCE(ret); |
bc0c38d1 SR |
513 | |
514 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 515 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
516 | } |
517 | ||
4fcdae83 SR |
518 | /** |
519 | * register_tracer - register a tracer with the ftrace system. | |
520 | * @type - the plugin for the tracer | |
521 | * | |
522 | * Register a new plugin tracer. | |
523 | */ | |
bc0c38d1 SR |
524 | int register_tracer(struct tracer *type) |
525 | { | |
526 | struct tracer *t; | |
527 | int len; | |
528 | int ret = 0; | |
529 | ||
530 | if (!type->name) { | |
531 | pr_info("Tracer must have a name\n"); | |
532 | return -1; | |
533 | } | |
534 | ||
86fa2f60 IM |
535 | /* |
536 | * When this gets called we hold the BKL which means that | |
537 | * preemption is disabled. Various trace selftests however | |
538 | * need to disable and enable preemption for successful tests. | |
539 | * So we drop the BKL here and grab it after the tests again. | |
540 | */ | |
541 | unlock_kernel(); | |
bc0c38d1 | 542 | mutex_lock(&trace_types_lock); |
86fa2f60 | 543 | |
bc0c38d1 SR |
544 | for (t = trace_types; t; t = t->next) { |
545 | if (strcmp(type->name, t->name) == 0) { | |
546 | /* already found */ | |
547 | pr_info("Trace %s already registered\n", | |
548 | type->name); | |
549 | ret = -1; | |
550 | goto out; | |
551 | } | |
552 | } | |
553 | ||
adf9f195 FW |
554 | if (!type->set_flag) |
555 | type->set_flag = &dummy_set_flag; | |
556 | if (!type->flags) | |
557 | type->flags = &dummy_tracer_flags; | |
558 | else | |
559 | if (!type->flags->opts) | |
560 | type->flags->opts = dummy_tracer_opt; | |
561 | ||
60a11774 SR |
562 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
563 | if (type->selftest) { | |
564 | struct tracer *saved_tracer = current_trace; | |
60a11774 | 565 | struct trace_array *tr = &global_trace; |
60a11774 SR |
566 | int i; |
567 | /* | |
568 | * Run a selftest on this tracer. | |
569 | * Here we reset the trace buffer, and set the current | |
570 | * tracer to be this tracer. The tracer can then run some | |
571 | * internal tracing to verify that everything is in order. | |
572 | * If we fail, we do not register this tracer. | |
573 | */ | |
86fa2f60 | 574 | for_each_tracing_cpu(i) |
3928a8a2 | 575 | tracing_reset(tr, i); |
86fa2f60 | 576 | |
60a11774 | 577 | current_trace = type; |
60a11774 SR |
578 | /* the test is responsible for initializing and enabling */ |
579 | pr_info("Testing tracer %s: ", type->name); | |
580 | ret = type->selftest(type, tr); | |
581 | /* the test is responsible for resetting too */ | |
582 | current_trace = saved_tracer; | |
60a11774 SR |
583 | if (ret) { |
584 | printk(KERN_CONT "FAILED!\n"); | |
585 | goto out; | |
586 | } | |
1d4db00a | 587 | /* Only reset on passing, to avoid touching corrupted buffers */ |
86fa2f60 | 588 | for_each_tracing_cpu(i) |
3928a8a2 | 589 | tracing_reset(tr, i); |
86fa2f60 | 590 | |
60a11774 SR |
591 | printk(KERN_CONT "PASSED\n"); |
592 | } | |
593 | #endif | |
594 | ||
bc0c38d1 SR |
595 | type->next = trace_types; |
596 | trace_types = type; | |
597 | len = strlen(type->name); | |
598 | if (len > max_tracer_type_len) | |
599 | max_tracer_type_len = len; | |
60a11774 | 600 | |
bc0c38d1 SR |
601 | out: |
602 | mutex_unlock(&trace_types_lock); | |
86fa2f60 | 603 | lock_kernel(); |
bc0c38d1 SR |
604 | |
605 | return ret; | |
606 | } | |
607 | ||
608 | void unregister_tracer(struct tracer *type) | |
609 | { | |
610 | struct tracer **t; | |
611 | int len; | |
612 | ||
613 | mutex_lock(&trace_types_lock); | |
614 | for (t = &trace_types; *t; t = &(*t)->next) { | |
615 | if (*t == type) | |
616 | goto found; | |
617 | } | |
618 | pr_info("Trace %s not registered\n", type->name); | |
619 | goto out; | |
620 | ||
621 | found: | |
622 | *t = (*t)->next; | |
623 | if (strlen(type->name) != max_tracer_type_len) | |
624 | goto out; | |
625 | ||
626 | max_tracer_type_len = 0; | |
627 | for (t = &trace_types; *t; t = &(*t)->next) { | |
628 | len = strlen((*t)->name); | |
629 | if (len > max_tracer_type_len) | |
630 | max_tracer_type_len = len; | |
631 | } | |
632 | out: | |
633 | mutex_unlock(&trace_types_lock); | |
634 | } | |
635 | ||
3928a8a2 | 636 | void tracing_reset(struct trace_array *tr, int cpu) |
bc0c38d1 | 637 | { |
d769041f | 638 | ftrace_disable_cpu(); |
3928a8a2 | 639 | ring_buffer_reset_cpu(tr->buffer, cpu); |
d769041f | 640 | ftrace_enable_cpu(); |
bc0c38d1 SR |
641 | } |
642 | ||
bc0c38d1 SR |
643 | #define SAVED_CMDLINES 128 |
644 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; | |
645 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; | |
646 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; | |
647 | static int cmdline_idx; | |
648 | static DEFINE_SPINLOCK(trace_cmdline_lock); | |
25b0b44a | 649 | |
25b0b44a SR |
650 | /* temporary disable recording */ |
651 | atomic_t trace_record_cmdline_disabled __read_mostly; | |
bc0c38d1 SR |
652 | |
653 | static void trace_init_cmdlines(void) | |
654 | { | |
655 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); | |
656 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); | |
657 | cmdline_idx = 0; | |
658 | } | |
659 | ||
0f048701 SR |
660 | static int trace_stop_count; |
661 | static DEFINE_SPINLOCK(tracing_start_lock); | |
662 | ||
663 | /** | |
664 | * tracing_start - quick start of the tracer | |
665 | * | |
666 | * If tracing is enabled but was stopped by tracing_stop, | |
667 | * this will start the tracer back up. | |
668 | */ | |
669 | void tracing_start(void) | |
670 | { | |
671 | struct ring_buffer *buffer; | |
672 | unsigned long flags; | |
673 | ||
674 | if (tracing_disabled) | |
675 | return; | |
676 | ||
677 | spin_lock_irqsave(&tracing_start_lock, flags); | |
678 | if (--trace_stop_count) | |
679 | goto out; | |
680 | ||
681 | if (trace_stop_count < 0) { | |
682 | /* Someone screwed up their debugging */ | |
683 | WARN_ON_ONCE(1); | |
684 | trace_stop_count = 0; | |
685 | goto out; | |
686 | } | |
687 | ||
688 | ||
689 | buffer = global_trace.buffer; | |
690 | if (buffer) | |
691 | ring_buffer_record_enable(buffer); | |
692 | ||
693 | buffer = max_tr.buffer; | |
694 | if (buffer) | |
695 | ring_buffer_record_enable(buffer); | |
696 | ||
697 | ftrace_start(); | |
698 | out: | |
699 | spin_unlock_irqrestore(&tracing_start_lock, flags); | |
700 | } | |
701 | ||
702 | /** | |
703 | * tracing_stop - quick stop of the tracer | |
704 | * | |
705 | * Light weight way to stop tracing. Use in conjunction with | |
706 | * tracing_start. | |
707 | */ | |
708 | void tracing_stop(void) | |
709 | { | |
710 | struct ring_buffer *buffer; | |
711 | unsigned long flags; | |
712 | ||
713 | ftrace_stop(); | |
714 | spin_lock_irqsave(&tracing_start_lock, flags); | |
715 | if (trace_stop_count++) | |
716 | goto out; | |
717 | ||
718 | buffer = global_trace.buffer; | |
719 | if (buffer) | |
720 | ring_buffer_record_disable(buffer); | |
721 | ||
722 | buffer = max_tr.buffer; | |
723 | if (buffer) | |
724 | ring_buffer_record_disable(buffer); | |
725 | ||
726 | out: | |
727 | spin_unlock_irqrestore(&tracing_start_lock, flags); | |
728 | } | |
729 | ||
e309b41d | 730 | void trace_stop_cmdline_recording(void); |
bc0c38d1 | 731 | |
e309b41d | 732 | static void trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
733 | { |
734 | unsigned map; | |
735 | unsigned idx; | |
736 | ||
737 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
738 | return; | |
739 | ||
740 | /* | |
741 | * It's not the end of the world if we don't get | |
742 | * the lock, but we also don't want to spin | |
743 | * nor do we want to disable interrupts, | |
744 | * so if we miss here, then better luck next time. | |
745 | */ | |
746 | if (!spin_trylock(&trace_cmdline_lock)) | |
747 | return; | |
748 | ||
749 | idx = map_pid_to_cmdline[tsk->pid]; | |
750 | if (idx >= SAVED_CMDLINES) { | |
751 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; | |
752 | ||
753 | map = map_cmdline_to_pid[idx]; | |
754 | if (map <= PID_MAX_DEFAULT) | |
755 | map_pid_to_cmdline[map] = (unsigned)-1; | |
756 | ||
757 | map_pid_to_cmdline[tsk->pid] = idx; | |
758 | ||
759 | cmdline_idx = idx; | |
760 | } | |
761 | ||
762 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); | |
763 | ||
764 | spin_unlock(&trace_cmdline_lock); | |
765 | } | |
766 | ||
e309b41d | 767 | static char *trace_find_cmdline(int pid) |
bc0c38d1 SR |
768 | { |
769 | char *cmdline = "<...>"; | |
770 | unsigned map; | |
771 | ||
772 | if (!pid) | |
773 | return "<idle>"; | |
774 | ||
775 | if (pid > PID_MAX_DEFAULT) | |
776 | goto out; | |
777 | ||
778 | map = map_pid_to_cmdline[pid]; | |
779 | if (map >= SAVED_CMDLINES) | |
780 | goto out; | |
781 | ||
782 | cmdline = saved_cmdlines[map]; | |
783 | ||
784 | out: | |
785 | return cmdline; | |
786 | } | |
787 | ||
e309b41d | 788 | void tracing_record_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
789 | { |
790 | if (atomic_read(&trace_record_cmdline_disabled)) | |
791 | return; | |
792 | ||
793 | trace_save_cmdline(tsk); | |
794 | } | |
795 | ||
45dcd8b8 | 796 | void |
38697053 SR |
797 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags, |
798 | int pc) | |
bc0c38d1 SR |
799 | { |
800 | struct task_struct *tsk = current; | |
bc0c38d1 | 801 | |
777e208d SR |
802 | entry->preempt_count = pc & 0xff; |
803 | entry->pid = (tsk) ? tsk->pid : 0; | |
804 | entry->flags = | |
9244489a | 805 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT |
2e2ca155 | 806 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
9244489a SR |
807 | #else |
808 | TRACE_FLAG_IRQS_NOSUPPORT | | |
809 | #endif | |
bc0c38d1 SR |
810 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
811 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | | |
812 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); | |
813 | } | |
814 | ||
e309b41d | 815 | void |
6fb44b71 | 816 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
38697053 SR |
817 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
818 | int pc) | |
bc0c38d1 | 819 | { |
3928a8a2 | 820 | struct ring_buffer_event *event; |
777e208d | 821 | struct ftrace_entry *entry; |
dcb6308f | 822 | unsigned long irq_flags; |
bc0c38d1 | 823 | |
d769041f SR |
824 | /* If we are reading the ring buffer, don't trace */ |
825 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) | |
826 | return; | |
827 | ||
3928a8a2 SR |
828 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
829 | &irq_flags); | |
830 | if (!event) | |
831 | return; | |
832 | entry = ring_buffer_event_data(event); | |
38697053 | 833 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
834 | entry->ent.type = TRACE_FN; |
835 | entry->ip = ip; | |
836 | entry->parent_ip = parent_ip; | |
3928a8a2 | 837 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
bc0c38d1 SR |
838 | } |
839 | ||
15e6cb36 FW |
840 | #ifdef CONFIG_FUNCTION_RET_TRACER |
841 | static void __trace_function_return(struct trace_array *tr, | |
842 | struct trace_array_cpu *data, | |
843 | struct ftrace_retfunc *trace, | |
844 | unsigned long flags, | |
845 | int pc) | |
846 | { | |
847 | struct ring_buffer_event *event; | |
848 | struct ftrace_ret_entry *entry; | |
849 | unsigned long irq_flags; | |
850 | ||
851 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) | |
852 | return; | |
853 | ||
854 | event = ring_buffer_lock_reserve(global_trace.buffer, sizeof(*entry), | |
855 | &irq_flags); | |
856 | if (!event) | |
857 | return; | |
858 | entry = ring_buffer_event_data(event); | |
859 | tracing_generic_entry_update(&entry->ent, flags, pc); | |
860 | entry->ent.type = TRACE_FN_RET; | |
861 | entry->ip = trace->func; | |
862 | entry->parent_ip = trace->ret; | |
863 | entry->rettime = trace->rettime; | |
864 | entry->calltime = trace->calltime; | |
0231022c | 865 | entry->overrun = trace->overrun; |
15e6cb36 FW |
866 | ring_buffer_unlock_commit(global_trace.buffer, event, irq_flags); |
867 | } | |
868 | #endif | |
869 | ||
e309b41d | 870 | void |
2e0f5761 | 871 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
38697053 SR |
872 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
873 | int pc) | |
2e0f5761 IM |
874 | { |
875 | if (likely(!atomic_read(&data->disabled))) | |
38697053 | 876 | trace_function(tr, data, ip, parent_ip, flags, pc); |
2e0f5761 IM |
877 | } |
878 | ||
38697053 SR |
879 | static void ftrace_trace_stack(struct trace_array *tr, |
880 | struct trace_array_cpu *data, | |
881 | unsigned long flags, | |
882 | int skip, int pc) | |
86387f7e | 883 | { |
c2c80529 | 884 | #ifdef CONFIG_STACKTRACE |
3928a8a2 | 885 | struct ring_buffer_event *event; |
777e208d | 886 | struct stack_entry *entry; |
86387f7e | 887 | struct stack_trace trace; |
3928a8a2 | 888 | unsigned long irq_flags; |
86387f7e IM |
889 | |
890 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) | |
891 | return; | |
892 | ||
3928a8a2 SR |
893 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
894 | &irq_flags); | |
895 | if (!event) | |
896 | return; | |
897 | entry = ring_buffer_event_data(event); | |
38697053 | 898 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d | 899 | entry->ent.type = TRACE_STACK; |
86387f7e | 900 | |
777e208d | 901 | memset(&entry->caller, 0, sizeof(entry->caller)); |
86387f7e IM |
902 | |
903 | trace.nr_entries = 0; | |
904 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
905 | trace.skip = skip; | |
777e208d | 906 | trace.entries = entry->caller; |
86387f7e IM |
907 | |
908 | save_stack_trace(&trace); | |
3928a8a2 | 909 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
c2c80529 | 910 | #endif |
f0a920d5 IM |
911 | } |
912 | ||
38697053 SR |
913 | void __trace_stack(struct trace_array *tr, |
914 | struct trace_array_cpu *data, | |
915 | unsigned long flags, | |
916 | int skip) | |
917 | { | |
918 | ftrace_trace_stack(tr, data, flags, skip, preempt_count()); | |
919 | } | |
920 | ||
921 | static void | |
922 | ftrace_trace_special(void *__tr, void *__data, | |
923 | unsigned long arg1, unsigned long arg2, unsigned long arg3, | |
924 | int pc) | |
a4feb834 | 925 | { |
3928a8a2 | 926 | struct ring_buffer_event *event; |
a4feb834 IM |
927 | struct trace_array_cpu *data = __data; |
928 | struct trace_array *tr = __tr; | |
777e208d | 929 | struct special_entry *entry; |
a4feb834 IM |
930 | unsigned long irq_flags; |
931 | ||
3928a8a2 SR |
932 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
933 | &irq_flags); | |
934 | if (!event) | |
935 | return; | |
936 | entry = ring_buffer_event_data(event); | |
38697053 | 937 | tracing_generic_entry_update(&entry->ent, 0, pc); |
777e208d SR |
938 | entry->ent.type = TRACE_SPECIAL; |
939 | entry->arg1 = arg1; | |
940 | entry->arg2 = arg2; | |
941 | entry->arg3 = arg3; | |
3928a8a2 | 942 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 943 | ftrace_trace_stack(tr, data, irq_flags, 4, pc); |
a4feb834 IM |
944 | |
945 | trace_wake_up(); | |
946 | } | |
947 | ||
38697053 SR |
948 | void |
949 | __trace_special(void *__tr, void *__data, | |
950 | unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
951 | { | |
952 | ftrace_trace_special(__tr, __data, arg1, arg2, arg3, preempt_count()); | |
953 | } | |
954 | ||
e309b41d | 955 | void |
bc0c38d1 SR |
956 | tracing_sched_switch_trace(struct trace_array *tr, |
957 | struct trace_array_cpu *data, | |
86387f7e IM |
958 | struct task_struct *prev, |
959 | struct task_struct *next, | |
38697053 | 960 | unsigned long flags, int pc) |
bc0c38d1 | 961 | { |
3928a8a2 | 962 | struct ring_buffer_event *event; |
777e208d | 963 | struct ctx_switch_entry *entry; |
dcb6308f | 964 | unsigned long irq_flags; |
bc0c38d1 | 965 | |
3928a8a2 SR |
966 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
967 | &irq_flags); | |
968 | if (!event) | |
969 | return; | |
970 | entry = ring_buffer_event_data(event); | |
38697053 | 971 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
972 | entry->ent.type = TRACE_CTX; |
973 | entry->prev_pid = prev->pid; | |
974 | entry->prev_prio = prev->prio; | |
975 | entry->prev_state = prev->state; | |
976 | entry->next_pid = next->pid; | |
977 | entry->next_prio = next->prio; | |
978 | entry->next_state = next->state; | |
979 | entry->next_cpu = task_cpu(next); | |
3928a8a2 | 980 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 981 | ftrace_trace_stack(tr, data, flags, 5, pc); |
bc0c38d1 SR |
982 | } |
983 | ||
57422797 IM |
984 | void |
985 | tracing_sched_wakeup_trace(struct trace_array *tr, | |
986 | struct trace_array_cpu *data, | |
86387f7e IM |
987 | struct task_struct *wakee, |
988 | struct task_struct *curr, | |
38697053 | 989 | unsigned long flags, int pc) |
57422797 | 990 | { |
3928a8a2 | 991 | struct ring_buffer_event *event; |
777e208d | 992 | struct ctx_switch_entry *entry; |
57422797 IM |
993 | unsigned long irq_flags; |
994 | ||
3928a8a2 SR |
995 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
996 | &irq_flags); | |
997 | if (!event) | |
998 | return; | |
999 | entry = ring_buffer_event_data(event); | |
38697053 | 1000 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
1001 | entry->ent.type = TRACE_WAKE; |
1002 | entry->prev_pid = curr->pid; | |
1003 | entry->prev_prio = curr->prio; | |
1004 | entry->prev_state = curr->state; | |
1005 | entry->next_pid = wakee->pid; | |
1006 | entry->next_prio = wakee->prio; | |
1007 | entry->next_state = wakee->state; | |
1008 | entry->next_cpu = task_cpu(wakee); | |
3928a8a2 | 1009 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 1010 | ftrace_trace_stack(tr, data, flags, 6, pc); |
017730c1 IM |
1011 | |
1012 | trace_wake_up(); | |
57422797 IM |
1013 | } |
1014 | ||
4902f884 SR |
1015 | void |
1016 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
1017 | { | |
1018 | struct trace_array *tr = &global_trace; | |
1019 | struct trace_array_cpu *data; | |
5aa1ba6a | 1020 | unsigned long flags; |
4902f884 | 1021 | int cpu; |
38697053 | 1022 | int pc; |
4902f884 | 1023 | |
c76f0694 | 1024 | if (tracing_disabled) |
4902f884 SR |
1025 | return; |
1026 | ||
38697053 | 1027 | pc = preempt_count(); |
5aa1ba6a | 1028 | local_irq_save(flags); |
4902f884 SR |
1029 | cpu = raw_smp_processor_id(); |
1030 | data = tr->data[cpu]; | |
4902f884 | 1031 | |
5aa1ba6a | 1032 | if (likely(atomic_inc_return(&data->disabled) == 1)) |
38697053 | 1033 | ftrace_trace_special(tr, data, arg1, arg2, arg3, pc); |
4902f884 | 1034 | |
5aa1ba6a SR |
1035 | atomic_dec(&data->disabled); |
1036 | local_irq_restore(flags); | |
4902f884 SR |
1037 | } |
1038 | ||
606576ce | 1039 | #ifdef CONFIG_FUNCTION_TRACER |
e309b41d | 1040 | static void |
b2a866f9 | 1041 | function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip) |
2e0f5761 IM |
1042 | { |
1043 | struct trace_array *tr = &global_trace; | |
1044 | struct trace_array_cpu *data; | |
1045 | unsigned long flags; | |
1046 | long disabled; | |
38697053 SR |
1047 | int cpu, resched; |
1048 | int pc; | |
2e0f5761 | 1049 | |
60bc0800 | 1050 | if (unlikely(!ftrace_function_enabled)) |
2e0f5761 IM |
1051 | return; |
1052 | ||
38697053 | 1053 | pc = preempt_count(); |
182e9f5f | 1054 | resched = ftrace_preempt_disable(); |
38697053 | 1055 | local_save_flags(flags); |
2e0f5761 IM |
1056 | cpu = raw_smp_processor_id(); |
1057 | data = tr->data[cpu]; | |
1058 | disabled = atomic_inc_return(&data->disabled); | |
1059 | ||
1060 | if (likely(disabled == 1)) | |
38697053 | 1061 | trace_function(tr, data, ip, parent_ip, flags, pc); |
2e0f5761 IM |
1062 | |
1063 | atomic_dec(&data->disabled); | |
182e9f5f | 1064 | ftrace_preempt_enable(resched); |
2e0f5761 IM |
1065 | } |
1066 | ||
b2a866f9 SR |
1067 | static void |
1068 | function_trace_call(unsigned long ip, unsigned long parent_ip) | |
1069 | { | |
1070 | struct trace_array *tr = &global_trace; | |
1071 | struct trace_array_cpu *data; | |
1072 | unsigned long flags; | |
1073 | long disabled; | |
1074 | int cpu; | |
1075 | int pc; | |
1076 | ||
1077 | if (unlikely(!ftrace_function_enabled)) | |
1078 | return; | |
1079 | ||
1080 | /* | |
1081 | * Need to use raw, since this must be called before the | |
1082 | * recursive protection is performed. | |
1083 | */ | |
d51ad7ac | 1084 | local_irq_save(flags); |
b2a866f9 SR |
1085 | cpu = raw_smp_processor_id(); |
1086 | data = tr->data[cpu]; | |
1087 | disabled = atomic_inc_return(&data->disabled); | |
1088 | ||
1089 | if (likely(disabled == 1)) { | |
1090 | pc = preempt_count(); | |
1091 | trace_function(tr, data, ip, parent_ip, flags, pc); | |
1092 | } | |
1093 | ||
1094 | atomic_dec(&data->disabled); | |
d51ad7ac | 1095 | local_irq_restore(flags); |
b2a866f9 SR |
1096 | } |
1097 | ||
15e6cb36 FW |
1098 | #ifdef CONFIG_FUNCTION_RET_TRACER |
1099 | void trace_function_return(struct ftrace_retfunc *trace) | |
1100 | { | |
1101 | struct trace_array *tr = &global_trace; | |
1102 | struct trace_array_cpu *data; | |
1103 | unsigned long flags; | |
1104 | long disabled; | |
1105 | int cpu; | |
1106 | int pc; | |
1107 | ||
1108 | raw_local_irq_save(flags); | |
1109 | cpu = raw_smp_processor_id(); | |
1110 | data = tr->data[cpu]; | |
1111 | disabled = atomic_inc_return(&data->disabled); | |
1112 | if (likely(disabled == 1)) { | |
1113 | pc = preempt_count(); | |
1114 | __trace_function_return(tr, data, trace, flags, pc); | |
1115 | } | |
1116 | atomic_dec(&data->disabled); | |
1117 | raw_local_irq_restore(flags); | |
1118 | } | |
1119 | #endif /* CONFIG_FUNCTION_RET_TRACER */ | |
1120 | ||
2e0f5761 IM |
1121 | static struct ftrace_ops trace_ops __read_mostly = |
1122 | { | |
1123 | .func = function_trace_call, | |
1124 | }; | |
1125 | ||
e309b41d | 1126 | void tracing_start_function_trace(void) |
2e0f5761 | 1127 | { |
60bc0800 | 1128 | ftrace_function_enabled = 0; |
b2a866f9 SR |
1129 | |
1130 | if (trace_flags & TRACE_ITER_PREEMPTONLY) | |
1131 | trace_ops.func = function_trace_call_preempt_only; | |
1132 | else | |
1133 | trace_ops.func = function_trace_call; | |
1134 | ||
2e0f5761 | 1135 | register_ftrace_function(&trace_ops); |
9036990d | 1136 | ftrace_function_enabled = 1; |
2e0f5761 IM |
1137 | } |
1138 | ||
e309b41d | 1139 | void tracing_stop_function_trace(void) |
2e0f5761 | 1140 | { |
60bc0800 | 1141 | ftrace_function_enabled = 0; |
2e0f5761 IM |
1142 | unregister_ftrace_function(&trace_ops); |
1143 | } | |
1144 | #endif | |
1145 | ||
bc0c38d1 SR |
1146 | enum trace_file_type { |
1147 | TRACE_FILE_LAT_FMT = 1, | |
12ef7d44 | 1148 | TRACE_FILE_ANNOTATE = 2, |
bc0c38d1 SR |
1149 | }; |
1150 | ||
5a90f577 SR |
1151 | static void trace_iterator_increment(struct trace_iterator *iter, int cpu) |
1152 | { | |
d769041f SR |
1153 | /* Don't allow ftrace to trace into the ring buffers */ |
1154 | ftrace_disable_cpu(); | |
1155 | ||
5a90f577 | 1156 | iter->idx++; |
d769041f SR |
1157 | if (iter->buffer_iter[iter->cpu]) |
1158 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); | |
1159 | ||
1160 | ftrace_enable_cpu(); | |
5a90f577 SR |
1161 | } |
1162 | ||
e309b41d | 1163 | static struct trace_entry * |
3928a8a2 | 1164 | peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts) |
dd0e545f | 1165 | { |
3928a8a2 SR |
1166 | struct ring_buffer_event *event; |
1167 | struct ring_buffer_iter *buf_iter = iter->buffer_iter[cpu]; | |
dd0e545f | 1168 | |
d769041f SR |
1169 | /* Don't allow ftrace to trace into the ring buffers */ |
1170 | ftrace_disable_cpu(); | |
1171 | ||
1172 | if (buf_iter) | |
1173 | event = ring_buffer_iter_peek(buf_iter, ts); | |
1174 | else | |
1175 | event = ring_buffer_peek(iter->tr->buffer, cpu, ts); | |
1176 | ||
1177 | ftrace_enable_cpu(); | |
1178 | ||
3928a8a2 | 1179 | return event ? ring_buffer_event_data(event) : NULL; |
dd0e545f | 1180 | } |
d769041f | 1181 | |
dd0e545f | 1182 | static struct trace_entry * |
3928a8a2 | 1183 | __find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
bc0c38d1 | 1184 | { |
3928a8a2 | 1185 | struct ring_buffer *buffer = iter->tr->buffer; |
bc0c38d1 | 1186 | struct trace_entry *ent, *next = NULL; |
3928a8a2 | 1187 | u64 next_ts = 0, ts; |
bc0c38d1 SR |
1188 | int next_cpu = -1; |
1189 | int cpu; | |
1190 | ||
ab46428c | 1191 | for_each_tracing_cpu(cpu) { |
dd0e545f | 1192 | |
3928a8a2 SR |
1193 | if (ring_buffer_empty_cpu(buffer, cpu)) |
1194 | continue; | |
dd0e545f | 1195 | |
3928a8a2 | 1196 | ent = peek_next_entry(iter, cpu, &ts); |
dd0e545f | 1197 | |
cdd31cd2 IM |
1198 | /* |
1199 | * Pick the entry with the smallest timestamp: | |
1200 | */ | |
3928a8a2 | 1201 | if (ent && (!next || ts < next_ts)) { |
bc0c38d1 SR |
1202 | next = ent; |
1203 | next_cpu = cpu; | |
3928a8a2 | 1204 | next_ts = ts; |
bc0c38d1 SR |
1205 | } |
1206 | } | |
1207 | ||
1208 | if (ent_cpu) | |
1209 | *ent_cpu = next_cpu; | |
1210 | ||
3928a8a2 SR |
1211 | if (ent_ts) |
1212 | *ent_ts = next_ts; | |
1213 | ||
bc0c38d1 SR |
1214 | return next; |
1215 | } | |
1216 | ||
dd0e545f SR |
1217 | /* Find the next real entry, without updating the iterator itself */ |
1218 | static struct trace_entry * | |
3928a8a2 | 1219 | find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
bc0c38d1 | 1220 | { |
3928a8a2 | 1221 | return __find_next_entry(iter, ent_cpu, ent_ts); |
dd0e545f SR |
1222 | } |
1223 | ||
1224 | /* Find the next real entry, and increment the iterator to the next entry */ | |
1225 | static void *find_next_entry_inc(struct trace_iterator *iter) | |
1226 | { | |
3928a8a2 | 1227 | iter->ent = __find_next_entry(iter, &iter->cpu, &iter->ts); |
dd0e545f | 1228 | |
3928a8a2 | 1229 | if (iter->ent) |
dd0e545f SR |
1230 | trace_iterator_increment(iter, iter->cpu); |
1231 | ||
3928a8a2 | 1232 | return iter->ent ? iter : NULL; |
b3806b43 | 1233 | } |
bc0c38d1 | 1234 | |
e309b41d | 1235 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 | 1236 | { |
d769041f SR |
1237 | /* Don't allow ftrace to trace into the ring buffers */ |
1238 | ftrace_disable_cpu(); | |
3928a8a2 | 1239 | ring_buffer_consume(iter->tr->buffer, iter->cpu, &iter->ts); |
d769041f | 1240 | ftrace_enable_cpu(); |
bc0c38d1 SR |
1241 | } |
1242 | ||
e309b41d | 1243 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
1244 | { |
1245 | struct trace_iterator *iter = m->private; | |
bc0c38d1 | 1246 | int i = (int)*pos; |
4e3c3333 | 1247 | void *ent; |
bc0c38d1 SR |
1248 | |
1249 | (*pos)++; | |
1250 | ||
1251 | /* can't go backwards */ | |
1252 | if (iter->idx > i) | |
1253 | return NULL; | |
1254 | ||
1255 | if (iter->idx < 0) | |
1256 | ent = find_next_entry_inc(iter); | |
1257 | else | |
1258 | ent = iter; | |
1259 | ||
1260 | while (ent && iter->idx < i) | |
1261 | ent = find_next_entry_inc(iter); | |
1262 | ||
1263 | iter->pos = *pos; | |
1264 | ||
bc0c38d1 SR |
1265 | return ent; |
1266 | } | |
1267 | ||
1268 | static void *s_start(struct seq_file *m, loff_t *pos) | |
1269 | { | |
1270 | struct trace_iterator *iter = m->private; | |
1271 | void *p = NULL; | |
1272 | loff_t l = 0; | |
3928a8a2 | 1273 | int cpu; |
bc0c38d1 SR |
1274 | |
1275 | mutex_lock(&trace_types_lock); | |
1276 | ||
d15f57f2 SR |
1277 | if (!current_trace || current_trace != iter->trace) { |
1278 | mutex_unlock(&trace_types_lock); | |
bc0c38d1 | 1279 | return NULL; |
d15f57f2 | 1280 | } |
bc0c38d1 SR |
1281 | |
1282 | atomic_inc(&trace_record_cmdline_disabled); | |
1283 | ||
bc0c38d1 SR |
1284 | if (*pos != iter->pos) { |
1285 | iter->ent = NULL; | |
1286 | iter->cpu = 0; | |
1287 | iter->idx = -1; | |
1288 | ||
d769041f SR |
1289 | ftrace_disable_cpu(); |
1290 | ||
3928a8a2 SR |
1291 | for_each_tracing_cpu(cpu) { |
1292 | ring_buffer_iter_reset(iter->buffer_iter[cpu]); | |
4c11d7ae | 1293 | } |
bc0c38d1 | 1294 | |
d769041f SR |
1295 | ftrace_enable_cpu(); |
1296 | ||
bc0c38d1 SR |
1297 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
1298 | ; | |
1299 | ||
1300 | } else { | |
4c11d7ae | 1301 | l = *pos - 1; |
bc0c38d1 SR |
1302 | p = s_next(m, p, &l); |
1303 | } | |
1304 | ||
1305 | return p; | |
1306 | } | |
1307 | ||
1308 | static void s_stop(struct seq_file *m, void *p) | |
1309 | { | |
bc0c38d1 | 1310 | atomic_dec(&trace_record_cmdline_disabled); |
bc0c38d1 SR |
1311 | mutex_unlock(&trace_types_lock); |
1312 | } | |
1313 | ||
76094a2c | 1314 | #ifdef CONFIG_KRETPROBES |
b3aa5577 | 1315 | static inline const char *kretprobed(const char *name) |
76094a2c | 1316 | { |
b3aa5577 SR |
1317 | static const char tramp_name[] = "kretprobe_trampoline"; |
1318 | int size = sizeof(tramp_name); | |
1319 | ||
1320 | if (strncmp(tramp_name, name, size) == 0) | |
1321 | return "[unknown/kretprobe'd]"; | |
1322 | return name; | |
76094a2c AS |
1323 | } |
1324 | #else | |
b3aa5577 | 1325 | static inline const char *kretprobed(const char *name) |
76094a2c | 1326 | { |
b3aa5577 | 1327 | return name; |
76094a2c AS |
1328 | } |
1329 | #endif /* CONFIG_KRETPROBES */ | |
1330 | ||
b3806b43 | 1331 | static int |
214023c3 | 1332 | seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) |
bc0c38d1 SR |
1333 | { |
1334 | #ifdef CONFIG_KALLSYMS | |
1335 | char str[KSYM_SYMBOL_LEN]; | |
b3aa5577 | 1336 | const char *name; |
bc0c38d1 SR |
1337 | |
1338 | kallsyms_lookup(address, NULL, NULL, NULL, str); | |
1339 | ||
b3aa5577 SR |
1340 | name = kretprobed(str); |
1341 | ||
1342 | return trace_seq_printf(s, fmt, name); | |
bc0c38d1 | 1343 | #endif |
b3806b43 | 1344 | return 1; |
bc0c38d1 SR |
1345 | } |
1346 | ||
b3806b43 | 1347 | static int |
214023c3 SR |
1348 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
1349 | unsigned long address) | |
bc0c38d1 SR |
1350 | { |
1351 | #ifdef CONFIG_KALLSYMS | |
1352 | char str[KSYM_SYMBOL_LEN]; | |
b3aa5577 | 1353 | const char *name; |
bc0c38d1 SR |
1354 | |
1355 | sprint_symbol(str, address); | |
b3aa5577 SR |
1356 | name = kretprobed(str); |
1357 | ||
1358 | return trace_seq_printf(s, fmt, name); | |
bc0c38d1 | 1359 | #endif |
b3806b43 | 1360 | return 1; |
bc0c38d1 SR |
1361 | } |
1362 | ||
1363 | #ifndef CONFIG_64BIT | |
1364 | # define IP_FMT "%08lx" | |
1365 | #else | |
1366 | # define IP_FMT "%016lx" | |
1367 | #endif | |
1368 | ||
15e6cb36 | 1369 | int |
214023c3 | 1370 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) |
bc0c38d1 | 1371 | { |
b3806b43 SR |
1372 | int ret; |
1373 | ||
1374 | if (!ip) | |
1375 | return trace_seq_printf(s, "0"); | |
bc0c38d1 SR |
1376 | |
1377 | if (sym_flags & TRACE_ITER_SYM_OFFSET) | |
b3806b43 | 1378 | ret = seq_print_sym_offset(s, "%s", ip); |
bc0c38d1 | 1379 | else |
b3806b43 SR |
1380 | ret = seq_print_sym_short(s, "%s", ip); |
1381 | ||
1382 | if (!ret) | |
1383 | return 0; | |
bc0c38d1 SR |
1384 | |
1385 | if (sym_flags & TRACE_ITER_SYM_ADDR) | |
b3806b43 SR |
1386 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
1387 | return ret; | |
bc0c38d1 SR |
1388 | } |
1389 | ||
e309b41d | 1390 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 | 1391 | { |
a6168353 ME |
1392 | seq_puts(m, "# _------=> CPU# \n"); |
1393 | seq_puts(m, "# / _-----=> irqs-off \n"); | |
1394 | seq_puts(m, "# | / _----=> need-resched \n"); | |
1395 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); | |
1396 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); | |
1397 | seq_puts(m, "# |||| / \n"); | |
1398 | seq_puts(m, "# ||||| delay \n"); | |
1399 | seq_puts(m, "# cmd pid ||||| time | caller \n"); | |
1400 | seq_puts(m, "# \\ / ||||| \\ | / \n"); | |
bc0c38d1 SR |
1401 | } |
1402 | ||
e309b41d | 1403 | static void print_func_help_header(struct seq_file *m) |
bc0c38d1 | 1404 | { |
a6168353 ME |
1405 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
1406 | seq_puts(m, "# | | | | |\n"); | |
bc0c38d1 SR |
1407 | } |
1408 | ||
1409 | ||
e309b41d | 1410 | static void |
bc0c38d1 SR |
1411 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
1412 | { | |
1413 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); | |
1414 | struct trace_array *tr = iter->tr; | |
1415 | struct trace_array_cpu *data = tr->data[tr->cpu]; | |
1416 | struct tracer *type = current_trace; | |
3928a8a2 SR |
1417 | unsigned long total; |
1418 | unsigned long entries; | |
bc0c38d1 SR |
1419 | const char *name = "preemption"; |
1420 | ||
1421 | if (type) | |
1422 | name = type->name; | |
1423 | ||
3928a8a2 SR |
1424 | entries = ring_buffer_entries(iter->tr->buffer); |
1425 | total = entries + | |
1426 | ring_buffer_overruns(iter->tr->buffer); | |
bc0c38d1 SR |
1427 | |
1428 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", | |
1429 | name, UTS_RELEASE); | |
1430 | seq_puts(m, "-----------------------------------" | |
1431 | "---------------------------------\n"); | |
1432 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" | |
1433 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", | |
57f50be1 | 1434 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 1435 | entries, |
4c11d7ae | 1436 | total, |
bc0c38d1 SR |
1437 | tr->cpu, |
1438 | #if defined(CONFIG_PREEMPT_NONE) | |
1439 | "server", | |
1440 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
1441 | "desktop", | |
b5c21b45 | 1442 | #elif defined(CONFIG_PREEMPT) |
bc0c38d1 SR |
1443 | "preempt", |
1444 | #else | |
1445 | "unknown", | |
1446 | #endif | |
1447 | /* These are reserved for later use */ | |
1448 | 0, 0, 0, 0); | |
1449 | #ifdef CONFIG_SMP | |
1450 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
1451 | #else | |
1452 | seq_puts(m, ")\n"); | |
1453 | #endif | |
1454 | seq_puts(m, " -----------------\n"); | |
1455 | seq_printf(m, " | task: %.16s-%d " | |
1456 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", | |
1457 | data->comm, data->pid, data->uid, data->nice, | |
1458 | data->policy, data->rt_priority); | |
1459 | seq_puts(m, " -----------------\n"); | |
1460 | ||
1461 | if (data->critical_start) { | |
1462 | seq_puts(m, " => started at: "); | |
214023c3 SR |
1463 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
1464 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 | 1465 | seq_puts(m, "\n => ended at: "); |
214023c3 SR |
1466 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
1467 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 SR |
1468 | seq_puts(m, "\n"); |
1469 | } | |
1470 | ||
1471 | seq_puts(m, "\n"); | |
1472 | } | |
1473 | ||
e309b41d | 1474 | static void |
214023c3 | 1475 | lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) |
bc0c38d1 SR |
1476 | { |
1477 | int hardirq, softirq; | |
1478 | char *comm; | |
1479 | ||
777e208d | 1480 | comm = trace_find_cmdline(entry->pid); |
bc0c38d1 | 1481 | |
777e208d | 1482 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
a6168353 | 1483 | trace_seq_printf(s, "%3d", cpu); |
214023c3 | 1484 | trace_seq_printf(s, "%c%c", |
9244489a SR |
1485 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : |
1486 | (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : '.', | |
777e208d | 1487 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); |
bc0c38d1 | 1488 | |
777e208d SR |
1489 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; |
1490 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; | |
afc2abc0 | 1491 | if (hardirq && softirq) { |
214023c3 | 1492 | trace_seq_putc(s, 'H'); |
afc2abc0 IM |
1493 | } else { |
1494 | if (hardirq) { | |
214023c3 | 1495 | trace_seq_putc(s, 'h'); |
afc2abc0 | 1496 | } else { |
bc0c38d1 | 1497 | if (softirq) |
214023c3 | 1498 | trace_seq_putc(s, 's'); |
bc0c38d1 | 1499 | else |
214023c3 | 1500 | trace_seq_putc(s, '.'); |
bc0c38d1 SR |
1501 | } |
1502 | } | |
1503 | ||
777e208d SR |
1504 | if (entry->preempt_count) |
1505 | trace_seq_printf(s, "%x", entry->preempt_count); | |
bc0c38d1 | 1506 | else |
214023c3 | 1507 | trace_seq_puts(s, "."); |
bc0c38d1 SR |
1508 | } |
1509 | ||
1510 | unsigned long preempt_mark_thresh = 100; | |
1511 | ||
e309b41d | 1512 | static void |
3928a8a2 | 1513 | lat_print_timestamp(struct trace_seq *s, u64 abs_usecs, |
bc0c38d1 SR |
1514 | unsigned long rel_usecs) |
1515 | { | |
214023c3 | 1516 | trace_seq_printf(s, " %4lldus", abs_usecs); |
bc0c38d1 | 1517 | if (rel_usecs > preempt_mark_thresh) |
214023c3 | 1518 | trace_seq_puts(s, "!: "); |
bc0c38d1 | 1519 | else if (rel_usecs > 1) |
214023c3 | 1520 | trace_seq_puts(s, "+: "); |
bc0c38d1 | 1521 | else |
214023c3 | 1522 | trace_seq_puts(s, " : "); |
bc0c38d1 SR |
1523 | } |
1524 | ||
1525 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; | |
1526 | ||
fc5e27ae PP |
1527 | /* |
1528 | * The message is supposed to contain an ending newline. | |
1529 | * If the printing stops prematurely, try to add a newline of our own. | |
1530 | */ | |
1531 | void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter) | |
dd0e545f | 1532 | { |
dd0e545f | 1533 | struct trace_entry *ent; |
777e208d | 1534 | struct trace_field_cont *cont; |
fc5e27ae | 1535 | bool ok = true; |
dd0e545f | 1536 | |
3928a8a2 | 1537 | ent = peek_next_entry(iter, iter->cpu, NULL); |
dd0e545f SR |
1538 | if (!ent || ent->type != TRACE_CONT) { |
1539 | trace_seq_putc(s, '\n'); | |
1540 | return; | |
1541 | } | |
1542 | ||
1543 | do { | |
777e208d | 1544 | cont = (struct trace_field_cont *)ent; |
fc5e27ae | 1545 | if (ok) |
777e208d | 1546 | ok = (trace_seq_printf(s, "%s", cont->buf) > 0); |
d769041f SR |
1547 | |
1548 | ftrace_disable_cpu(); | |
1549 | ||
1550 | if (iter->buffer_iter[iter->cpu]) | |
1551 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); | |
1552 | else | |
1553 | ring_buffer_consume(iter->tr->buffer, iter->cpu, NULL); | |
1554 | ||
1555 | ftrace_enable_cpu(); | |
1556 | ||
3928a8a2 | 1557 | ent = peek_next_entry(iter, iter->cpu, NULL); |
dd0e545f | 1558 | } while (ent && ent->type == TRACE_CONT); |
fc5e27ae PP |
1559 | |
1560 | if (!ok) | |
1561 | trace_seq_putc(s, '\n'); | |
dd0e545f SR |
1562 | } |
1563 | ||
a309720c SR |
1564 | static void test_cpu_buff_start(struct trace_iterator *iter) |
1565 | { | |
1566 | struct trace_seq *s = &iter->seq; | |
1567 | ||
12ef7d44 SR |
1568 | if (!(trace_flags & TRACE_ITER_ANNOTATE)) |
1569 | return; | |
1570 | ||
1571 | if (!(iter->iter_flags & TRACE_FILE_ANNOTATE)) | |
1572 | return; | |
1573 | ||
a309720c SR |
1574 | if (cpu_isset(iter->cpu, iter->started)) |
1575 | return; | |
1576 | ||
1577 | cpu_set(iter->cpu, iter->started); | |
1578 | trace_seq_printf(s, "##### CPU %u buffer started ####\n", iter->cpu); | |
1579 | } | |
1580 | ||
2c4f035f | 1581 | static enum print_line_t |
214023c3 | 1582 | print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) |
bc0c38d1 | 1583 | { |
214023c3 | 1584 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1585 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
3928a8a2 | 1586 | struct trace_entry *next_entry; |
bc0c38d1 SR |
1587 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); |
1588 | struct trace_entry *entry = iter->ent; | |
1589 | unsigned long abs_usecs; | |
1590 | unsigned long rel_usecs; | |
3928a8a2 | 1591 | u64 next_ts; |
bc0c38d1 | 1592 | char *comm; |
bac524d3 | 1593 | int S, T; |
86387f7e | 1594 | int i; |
d17d9691 | 1595 | unsigned state; |
bc0c38d1 | 1596 | |
dd0e545f | 1597 | if (entry->type == TRACE_CONT) |
2c4f035f | 1598 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1599 | |
a309720c SR |
1600 | test_cpu_buff_start(iter); |
1601 | ||
3928a8a2 SR |
1602 | next_entry = find_next_entry(iter, NULL, &next_ts); |
1603 | if (!next_entry) | |
1604 | next_ts = iter->ts; | |
1605 | rel_usecs = ns2usecs(next_ts - iter->ts); | |
1606 | abs_usecs = ns2usecs(iter->ts - iter->tr->time_start); | |
bc0c38d1 SR |
1607 | |
1608 | if (verbose) { | |
777e208d | 1609 | comm = trace_find_cmdline(entry->pid); |
a6168353 | 1610 | trace_seq_printf(s, "%16s %5d %3d %d %08x %08x [%08lx]" |
214023c3 SR |
1611 | " %ld.%03ldms (+%ld.%03ldms): ", |
1612 | comm, | |
777e208d SR |
1613 | entry->pid, cpu, entry->flags, |
1614 | entry->preempt_count, trace_idx, | |
3928a8a2 | 1615 | ns2usecs(iter->ts), |
214023c3 SR |
1616 | abs_usecs/1000, |
1617 | abs_usecs % 1000, rel_usecs/1000, | |
1618 | rel_usecs % 1000); | |
bc0c38d1 | 1619 | } else { |
f29c73fe IM |
1620 | lat_print_generic(s, entry, cpu); |
1621 | lat_print_timestamp(s, abs_usecs, rel_usecs); | |
bc0c38d1 SR |
1622 | } |
1623 | switch (entry->type) { | |
777e208d | 1624 | case TRACE_FN: { |
7104f300 SR |
1625 | struct ftrace_entry *field; |
1626 | ||
1627 | trace_assign_type(field, entry); | |
777e208d SR |
1628 | |
1629 | seq_print_ip_sym(s, field->ip, sym_flags); | |
214023c3 | 1630 | trace_seq_puts(s, " ("); |
b3aa5577 | 1631 | seq_print_ip_sym(s, field->parent_ip, sym_flags); |
214023c3 | 1632 | trace_seq_puts(s, ")\n"); |
bc0c38d1 | 1633 | break; |
777e208d | 1634 | } |
bc0c38d1 | 1635 | case TRACE_CTX: |
777e208d | 1636 | case TRACE_WAKE: { |
7104f300 SR |
1637 | struct ctx_switch_entry *field; |
1638 | ||
1639 | trace_assign_type(field, entry); | |
777e208d SR |
1640 | |
1641 | T = field->next_state < sizeof(state_to_char) ? | |
1642 | state_to_char[field->next_state] : 'X'; | |
bac524d3 | 1643 | |
777e208d SR |
1644 | state = field->prev_state ? |
1645 | __ffs(field->prev_state) + 1 : 0; | |
d17d9691 | 1646 | S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X'; |
777e208d | 1647 | comm = trace_find_cmdline(field->next_pid); |
80b5e940 | 1648 | trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n", |
777e208d SR |
1649 | field->prev_pid, |
1650 | field->prev_prio, | |
57422797 | 1651 | S, entry->type == TRACE_CTX ? "==>" : " +", |
777e208d SR |
1652 | field->next_cpu, |
1653 | field->next_pid, | |
1654 | field->next_prio, | |
bac524d3 | 1655 | T, comm); |
bc0c38d1 | 1656 | break; |
777e208d SR |
1657 | } |
1658 | case TRACE_SPECIAL: { | |
7104f300 SR |
1659 | struct special_entry *field; |
1660 | ||
1661 | trace_assign_type(field, entry); | |
777e208d | 1662 | |
88a4216c | 1663 | trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
1664 | field->arg1, |
1665 | field->arg2, | |
1666 | field->arg3); | |
f0a920d5 | 1667 | break; |
777e208d SR |
1668 | } |
1669 | case TRACE_STACK: { | |
7104f300 SR |
1670 | struct stack_entry *field; |
1671 | ||
1672 | trace_assign_type(field, entry); | |
777e208d | 1673 | |
86387f7e IM |
1674 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
1675 | if (i) | |
1676 | trace_seq_puts(s, " <= "); | |
777e208d | 1677 | seq_print_ip_sym(s, field->caller[i], sym_flags); |
86387f7e IM |
1678 | } |
1679 | trace_seq_puts(s, "\n"); | |
1680 | break; | |
777e208d SR |
1681 | } |
1682 | case TRACE_PRINT: { | |
7104f300 SR |
1683 | struct print_entry *field; |
1684 | ||
1685 | trace_assign_type(field, entry); | |
777e208d SR |
1686 | |
1687 | seq_print_ip_sym(s, field->ip, sym_flags); | |
1688 | trace_seq_printf(s, ": %s", field->buf); | |
1689 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
1690 | trace_seq_print_cont(s, iter); |
1691 | break; | |
777e208d | 1692 | } |
9f029e83 SR |
1693 | case TRACE_BRANCH: { |
1694 | struct trace_branch *field; | |
52f232cb SR |
1695 | |
1696 | trace_assign_type(field, entry); | |
1697 | ||
1698 | trace_seq_printf(s, "[%s] %s:%s:%d\n", | |
68d119f0 | 1699 | field->correct ? " ok " : " MISS ", |
52f232cb SR |
1700 | field->func, |
1701 | field->file, | |
1702 | field->line); | |
1703 | break; | |
1704 | } | |
89b2f978 | 1705 | default: |
214023c3 | 1706 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
bc0c38d1 | 1707 | } |
2c4f035f | 1708 | return TRACE_TYPE_HANDLED; |
bc0c38d1 SR |
1709 | } |
1710 | ||
2c4f035f | 1711 | static enum print_line_t print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 1712 | { |
214023c3 | 1713 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1714 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 1715 | struct trace_entry *entry; |
bc0c38d1 SR |
1716 | unsigned long usec_rem; |
1717 | unsigned long long t; | |
1718 | unsigned long secs; | |
1719 | char *comm; | |
b3806b43 | 1720 | int ret; |
bac524d3 | 1721 | int S, T; |
86387f7e | 1722 | int i; |
bc0c38d1 | 1723 | |
4e3c3333 | 1724 | entry = iter->ent; |
dd0e545f SR |
1725 | |
1726 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1727 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1728 | |
a309720c SR |
1729 | test_cpu_buff_start(iter); |
1730 | ||
777e208d | 1731 | comm = trace_find_cmdline(iter->ent->pid); |
bc0c38d1 | 1732 | |
3928a8a2 | 1733 | t = ns2usecs(iter->ts); |
bc0c38d1 SR |
1734 | usec_rem = do_div(t, 1000000ULL); |
1735 | secs = (unsigned long)t; | |
1736 | ||
777e208d | 1737 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
f29c73fe | 1738 | if (!ret) |
2c4f035f | 1739 | return TRACE_TYPE_PARTIAL_LINE; |
a6168353 | 1740 | ret = trace_seq_printf(s, "[%03d] ", iter->cpu); |
f29c73fe | 1741 | if (!ret) |
2c4f035f | 1742 | return TRACE_TYPE_PARTIAL_LINE; |
f29c73fe IM |
1743 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); |
1744 | if (!ret) | |
2c4f035f | 1745 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 SR |
1746 | |
1747 | switch (entry->type) { | |
777e208d | 1748 | case TRACE_FN: { |
7104f300 SR |
1749 | struct ftrace_entry *field; |
1750 | ||
1751 | trace_assign_type(field, entry); | |
777e208d SR |
1752 | |
1753 | ret = seq_print_ip_sym(s, field->ip, sym_flags); | |
b3806b43 | 1754 | if (!ret) |
2c4f035f | 1755 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1756 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
777e208d | 1757 | field->parent_ip) { |
b3806b43 SR |
1758 | ret = trace_seq_printf(s, " <-"); |
1759 | if (!ret) | |
2c4f035f | 1760 | return TRACE_TYPE_PARTIAL_LINE; |
b3aa5577 SR |
1761 | ret = seq_print_ip_sym(s, |
1762 | field->parent_ip, | |
1763 | sym_flags); | |
b3806b43 | 1764 | if (!ret) |
2c4f035f | 1765 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1766 | } |
b3806b43 SR |
1767 | ret = trace_seq_printf(s, "\n"); |
1768 | if (!ret) | |
2c4f035f | 1769 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1770 | break; |
777e208d | 1771 | } |
bc0c38d1 | 1772 | case TRACE_CTX: |
777e208d | 1773 | case TRACE_WAKE: { |
7104f300 SR |
1774 | struct ctx_switch_entry *field; |
1775 | ||
1776 | trace_assign_type(field, entry); | |
777e208d SR |
1777 | |
1778 | S = field->prev_state < sizeof(state_to_char) ? | |
1779 | state_to_char[field->prev_state] : 'X'; | |
1780 | T = field->next_state < sizeof(state_to_char) ? | |
1781 | state_to_char[field->next_state] : 'X'; | |
80b5e940 | 1782 | ret = trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c\n", |
777e208d SR |
1783 | field->prev_pid, |
1784 | field->prev_prio, | |
b3806b43 | 1785 | S, |
57422797 | 1786 | entry->type == TRACE_CTX ? "==>" : " +", |
777e208d SR |
1787 | field->next_cpu, |
1788 | field->next_pid, | |
1789 | field->next_prio, | |
bac524d3 | 1790 | T); |
b3806b43 | 1791 | if (!ret) |
2c4f035f | 1792 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1793 | break; |
777e208d SR |
1794 | } |
1795 | case TRACE_SPECIAL: { | |
7104f300 SR |
1796 | struct special_entry *field; |
1797 | ||
1798 | trace_assign_type(field, entry); | |
777e208d | 1799 | |
88a4216c | 1800 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
1801 | field->arg1, |
1802 | field->arg2, | |
1803 | field->arg3); | |
f0a920d5 | 1804 | if (!ret) |
2c4f035f | 1805 | return TRACE_TYPE_PARTIAL_LINE; |
f0a920d5 | 1806 | break; |
777e208d SR |
1807 | } |
1808 | case TRACE_STACK: { | |
7104f300 SR |
1809 | struct stack_entry *field; |
1810 | ||
1811 | trace_assign_type(field, entry); | |
777e208d | 1812 | |
86387f7e IM |
1813 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
1814 | if (i) { | |
1815 | ret = trace_seq_puts(s, " <= "); | |
1816 | if (!ret) | |
2c4f035f | 1817 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e | 1818 | } |
777e208d | 1819 | ret = seq_print_ip_sym(s, field->caller[i], |
86387f7e IM |
1820 | sym_flags); |
1821 | if (!ret) | |
2c4f035f | 1822 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e IM |
1823 | } |
1824 | ret = trace_seq_puts(s, "\n"); | |
1825 | if (!ret) | |
2c4f035f | 1826 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e | 1827 | break; |
777e208d SR |
1828 | } |
1829 | case TRACE_PRINT: { | |
7104f300 SR |
1830 | struct print_entry *field; |
1831 | ||
1832 | trace_assign_type(field, entry); | |
777e208d SR |
1833 | |
1834 | seq_print_ip_sym(s, field->ip, sym_flags); | |
1835 | trace_seq_printf(s, ": %s", field->buf); | |
1836 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
1837 | trace_seq_print_cont(s, iter); |
1838 | break; | |
bc0c38d1 | 1839 | } |
15e6cb36 FW |
1840 | case TRACE_FN_RET: { |
1841 | return print_return_function(iter); | |
1842 | break; | |
1843 | } | |
9f029e83 SR |
1844 | case TRACE_BRANCH: { |
1845 | struct trace_branch *field; | |
52f232cb SR |
1846 | |
1847 | trace_assign_type(field, entry); | |
1848 | ||
1849 | trace_seq_printf(s, "[%s] %s:%s:%d\n", | |
68d119f0 | 1850 | field->correct ? " ok " : " MISS ", |
52f232cb SR |
1851 | field->func, |
1852 | field->file, | |
1853 | field->line); | |
1854 | break; | |
1855 | } | |
777e208d | 1856 | } |
2c4f035f | 1857 | return TRACE_TYPE_HANDLED; |
bc0c38d1 SR |
1858 | } |
1859 | ||
2c4f035f | 1860 | static enum print_line_t print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 IM |
1861 | { |
1862 | struct trace_seq *s = &iter->seq; | |
1863 | struct trace_entry *entry; | |
1864 | int ret; | |
bac524d3 | 1865 | int S, T; |
f9896bf3 IM |
1866 | |
1867 | entry = iter->ent; | |
dd0e545f SR |
1868 | |
1869 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1870 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1871 | |
f9896bf3 | 1872 | ret = trace_seq_printf(s, "%d %d %llu ", |
777e208d | 1873 | entry->pid, iter->cpu, iter->ts); |
f9896bf3 | 1874 | if (!ret) |
2c4f035f | 1875 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 IM |
1876 | |
1877 | switch (entry->type) { | |
777e208d | 1878 | case TRACE_FN: { |
7104f300 SR |
1879 | struct ftrace_entry *field; |
1880 | ||
1881 | trace_assign_type(field, entry); | |
777e208d | 1882 | |
f9896bf3 | 1883 | ret = trace_seq_printf(s, "%x %x\n", |
777e208d SR |
1884 | field->ip, |
1885 | field->parent_ip); | |
f9896bf3 | 1886 | if (!ret) |
2c4f035f | 1887 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 | 1888 | break; |
777e208d | 1889 | } |
f9896bf3 | 1890 | case TRACE_CTX: |
777e208d | 1891 | case TRACE_WAKE: { |
7104f300 SR |
1892 | struct ctx_switch_entry *field; |
1893 | ||
1894 | trace_assign_type(field, entry); | |
777e208d SR |
1895 | |
1896 | S = field->prev_state < sizeof(state_to_char) ? | |
1897 | state_to_char[field->prev_state] : 'X'; | |
1898 | T = field->next_state < sizeof(state_to_char) ? | |
1899 | state_to_char[field->next_state] : 'X'; | |
57422797 IM |
1900 | if (entry->type == TRACE_WAKE) |
1901 | S = '+'; | |
80b5e940 | 1902 | ret = trace_seq_printf(s, "%d %d %c %d %d %d %c\n", |
777e208d SR |
1903 | field->prev_pid, |
1904 | field->prev_prio, | |
f9896bf3 | 1905 | S, |
777e208d SR |
1906 | field->next_cpu, |
1907 | field->next_pid, | |
1908 | field->next_prio, | |
bac524d3 | 1909 | T); |
f9896bf3 | 1910 | if (!ret) |
2c4f035f | 1911 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 | 1912 | break; |
777e208d | 1913 | } |
f0a920d5 | 1914 | case TRACE_SPECIAL: |
777e208d | 1915 | case TRACE_STACK: { |
7104f300 SR |
1916 | struct special_entry *field; |
1917 | ||
1918 | trace_assign_type(field, entry); | |
777e208d | 1919 | |
88a4216c | 1920 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
1921 | field->arg1, |
1922 | field->arg2, | |
1923 | field->arg3); | |
f0a920d5 | 1924 | if (!ret) |
2c4f035f | 1925 | return TRACE_TYPE_PARTIAL_LINE; |
f0a920d5 | 1926 | break; |
777e208d SR |
1927 | } |
1928 | case TRACE_PRINT: { | |
7104f300 SR |
1929 | struct print_entry *field; |
1930 | ||
1931 | trace_assign_type(field, entry); | |
777e208d SR |
1932 | |
1933 | trace_seq_printf(s, "# %lx %s", field->ip, field->buf); | |
1934 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
1935 | trace_seq_print_cont(s, iter); |
1936 | break; | |
f9896bf3 | 1937 | } |
777e208d | 1938 | } |
2c4f035f | 1939 | return TRACE_TYPE_HANDLED; |
f9896bf3 IM |
1940 | } |
1941 | ||
cb0f12aa IM |
1942 | #define SEQ_PUT_FIELD_RET(s, x) \ |
1943 | do { \ | |
1944 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ | |
1945 | return 0; \ | |
1946 | } while (0) | |
1947 | ||
5e3ca0ec IM |
1948 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
1949 | do { \ | |
ad0a3b68 | 1950 | BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES); \ |
5e3ca0ec IM |
1951 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ |
1952 | return 0; \ | |
1953 | } while (0) | |
1954 | ||
2c4f035f | 1955 | static enum print_line_t print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec IM |
1956 | { |
1957 | struct trace_seq *s = &iter->seq; | |
1958 | unsigned char newline = '\n'; | |
1959 | struct trace_entry *entry; | |
bac524d3 | 1960 | int S, T; |
5e3ca0ec IM |
1961 | |
1962 | entry = iter->ent; | |
dd0e545f SR |
1963 | |
1964 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1965 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1966 | |
777e208d | 1967 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); |
5e3ca0ec | 1968 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); |
3928a8a2 | 1969 | SEQ_PUT_HEX_FIELD_RET(s, iter->ts); |
5e3ca0ec IM |
1970 | |
1971 | switch (entry->type) { | |
777e208d | 1972 | case TRACE_FN: { |
7104f300 SR |
1973 | struct ftrace_entry *field; |
1974 | ||
1975 | trace_assign_type(field, entry); | |
777e208d SR |
1976 | |
1977 | SEQ_PUT_HEX_FIELD_RET(s, field->ip); | |
1978 | SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip); | |
5e3ca0ec | 1979 | break; |
777e208d | 1980 | } |
5e3ca0ec | 1981 | case TRACE_CTX: |
777e208d | 1982 | case TRACE_WAKE: { |
7104f300 SR |
1983 | struct ctx_switch_entry *field; |
1984 | ||
1985 | trace_assign_type(field, entry); | |
777e208d SR |
1986 | |
1987 | S = field->prev_state < sizeof(state_to_char) ? | |
1988 | state_to_char[field->prev_state] : 'X'; | |
1989 | T = field->next_state < sizeof(state_to_char) ? | |
1990 | state_to_char[field->next_state] : 'X'; | |
57422797 IM |
1991 | if (entry->type == TRACE_WAKE) |
1992 | S = '+'; | |
777e208d SR |
1993 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid); |
1994 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio); | |
5e3ca0ec | 1995 | SEQ_PUT_HEX_FIELD_RET(s, S); |
777e208d SR |
1996 | SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu); |
1997 | SEQ_PUT_HEX_FIELD_RET(s, field->next_pid); | |
1998 | SEQ_PUT_HEX_FIELD_RET(s, field->next_prio); | |
bac524d3 | 1999 | SEQ_PUT_HEX_FIELD_RET(s, T); |
5e3ca0ec | 2000 | break; |
777e208d | 2001 | } |
5e3ca0ec | 2002 | case TRACE_SPECIAL: |
777e208d | 2003 | case TRACE_STACK: { |
7104f300 SR |
2004 | struct special_entry *field; |
2005 | ||
2006 | trace_assign_type(field, entry); | |
777e208d SR |
2007 | |
2008 | SEQ_PUT_HEX_FIELD_RET(s, field->arg1); | |
2009 | SEQ_PUT_HEX_FIELD_RET(s, field->arg2); | |
2010 | SEQ_PUT_HEX_FIELD_RET(s, field->arg3); | |
5e3ca0ec IM |
2011 | break; |
2012 | } | |
777e208d | 2013 | } |
5e3ca0ec IM |
2014 | SEQ_PUT_FIELD_RET(s, newline); |
2015 | ||
2c4f035f | 2016 | return TRACE_TYPE_HANDLED; |
5e3ca0ec IM |
2017 | } |
2018 | ||
2c4f035f | 2019 | static enum print_line_t print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa IM |
2020 | { |
2021 | struct trace_seq *s = &iter->seq; | |
2022 | struct trace_entry *entry; | |
2023 | ||
2024 | entry = iter->ent; | |
dd0e545f SR |
2025 | |
2026 | if (entry->type == TRACE_CONT) | |
2c4f035f | 2027 | return TRACE_TYPE_HANDLED; |
dd0e545f | 2028 | |
777e208d | 2029 | SEQ_PUT_FIELD_RET(s, entry->pid); |
072ba498 | 2030 | SEQ_PUT_FIELD_RET(s, entry->cpu); |
3928a8a2 | 2031 | SEQ_PUT_FIELD_RET(s, iter->ts); |
cb0f12aa IM |
2032 | |
2033 | switch (entry->type) { | |
777e208d | 2034 | case TRACE_FN: { |
7104f300 SR |
2035 | struct ftrace_entry *field; |
2036 | ||
2037 | trace_assign_type(field, entry); | |
777e208d SR |
2038 | |
2039 | SEQ_PUT_FIELD_RET(s, field->ip); | |
2040 | SEQ_PUT_FIELD_RET(s, field->parent_ip); | |
cb0f12aa | 2041 | break; |
777e208d SR |
2042 | } |
2043 | case TRACE_CTX: { | |
7104f300 SR |
2044 | struct ctx_switch_entry *field; |
2045 | ||
2046 | trace_assign_type(field, entry); | |
777e208d SR |
2047 | |
2048 | SEQ_PUT_FIELD_RET(s, field->prev_pid); | |
2049 | SEQ_PUT_FIELD_RET(s, field->prev_prio); | |
2050 | SEQ_PUT_FIELD_RET(s, field->prev_state); | |
2051 | SEQ_PUT_FIELD_RET(s, field->next_pid); | |
2052 | SEQ_PUT_FIELD_RET(s, field->next_prio); | |
2053 | SEQ_PUT_FIELD_RET(s, field->next_state); | |
cb0f12aa | 2054 | break; |
777e208d | 2055 | } |
f0a920d5 | 2056 | case TRACE_SPECIAL: |
777e208d | 2057 | case TRACE_STACK: { |
7104f300 SR |
2058 | struct special_entry *field; |
2059 | ||
2060 | trace_assign_type(field, entry); | |
777e208d SR |
2061 | |
2062 | SEQ_PUT_FIELD_RET(s, field->arg1); | |
2063 | SEQ_PUT_FIELD_RET(s, field->arg2); | |
2064 | SEQ_PUT_FIELD_RET(s, field->arg3); | |
f0a920d5 | 2065 | break; |
cb0f12aa | 2066 | } |
777e208d | 2067 | } |
cb0f12aa IM |
2068 | return 1; |
2069 | } | |
2070 | ||
bc0c38d1 SR |
2071 | static int trace_empty(struct trace_iterator *iter) |
2072 | { | |
bc0c38d1 SR |
2073 | int cpu; |
2074 | ||
ab46428c | 2075 | for_each_tracing_cpu(cpu) { |
d769041f SR |
2076 | if (iter->buffer_iter[cpu]) { |
2077 | if (!ring_buffer_iter_empty(iter->buffer_iter[cpu])) | |
2078 | return 0; | |
2079 | } else { | |
2080 | if (!ring_buffer_empty_cpu(iter->tr->buffer, cpu)) | |
2081 | return 0; | |
2082 | } | |
bc0c38d1 | 2083 | } |
d769041f | 2084 | |
797d3712 | 2085 | return 1; |
bc0c38d1 SR |
2086 | } |
2087 | ||
2c4f035f | 2088 | static enum print_line_t print_trace_line(struct trace_iterator *iter) |
f9896bf3 | 2089 | { |
2c4f035f FW |
2090 | enum print_line_t ret; |
2091 | ||
2092 | if (iter->trace && iter->trace->print_line) { | |
2093 | ret = iter->trace->print_line(iter); | |
2094 | if (ret != TRACE_TYPE_UNHANDLED) | |
2095 | return ret; | |
2096 | } | |
72829bc3 | 2097 | |
cb0f12aa IM |
2098 | if (trace_flags & TRACE_ITER_BIN) |
2099 | return print_bin_fmt(iter); | |
2100 | ||
5e3ca0ec IM |
2101 | if (trace_flags & TRACE_ITER_HEX) |
2102 | return print_hex_fmt(iter); | |
2103 | ||
f9896bf3 IM |
2104 | if (trace_flags & TRACE_ITER_RAW) |
2105 | return print_raw_fmt(iter); | |
2106 | ||
2107 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
2108 | return print_lat_fmt(iter, iter->idx, iter->cpu); | |
2109 | ||
2110 | return print_trace_fmt(iter); | |
2111 | } | |
2112 | ||
bc0c38d1 SR |
2113 | static int s_show(struct seq_file *m, void *v) |
2114 | { | |
2115 | struct trace_iterator *iter = v; | |
2116 | ||
2117 | if (iter->ent == NULL) { | |
2118 | if (iter->tr) { | |
2119 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
2120 | seq_puts(m, "#\n"); | |
2121 | } | |
2122 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { | |
2123 | /* print nothing if the buffers are empty */ | |
2124 | if (trace_empty(iter)) | |
2125 | return 0; | |
2126 | print_trace_header(m, iter); | |
2127 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
2128 | print_lat_help_header(m); | |
2129 | } else { | |
2130 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
2131 | print_func_help_header(m); | |
2132 | } | |
2133 | } else { | |
f9896bf3 | 2134 | print_trace_line(iter); |
214023c3 | 2135 | trace_print_seq(m, &iter->seq); |
bc0c38d1 SR |
2136 | } |
2137 | ||
2138 | return 0; | |
2139 | } | |
2140 | ||
2141 | static struct seq_operations tracer_seq_ops = { | |
4bf39a94 IM |
2142 | .start = s_start, |
2143 | .next = s_next, | |
2144 | .stop = s_stop, | |
2145 | .show = s_show, | |
bc0c38d1 SR |
2146 | }; |
2147 | ||
e309b41d | 2148 | static struct trace_iterator * |
bc0c38d1 SR |
2149 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
2150 | { | |
2151 | struct trace_iterator *iter; | |
3928a8a2 SR |
2152 | struct seq_file *m; |
2153 | int cpu; | |
bc0c38d1 | 2154 | |
60a11774 SR |
2155 | if (tracing_disabled) { |
2156 | *ret = -ENODEV; | |
2157 | return NULL; | |
2158 | } | |
2159 | ||
bc0c38d1 SR |
2160 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
2161 | if (!iter) { | |
2162 | *ret = -ENOMEM; | |
2163 | goto out; | |
2164 | } | |
2165 | ||
2166 | mutex_lock(&trace_types_lock); | |
2167 | if (current_trace && current_trace->print_max) | |
2168 | iter->tr = &max_tr; | |
2169 | else | |
2170 | iter->tr = inode->i_private; | |
2171 | iter->trace = current_trace; | |
2172 | iter->pos = -1; | |
2173 | ||
12ef7d44 SR |
2174 | /* Annotate start of buffers if we had overruns */ |
2175 | if (ring_buffer_overruns(iter->tr->buffer)) | |
2176 | iter->iter_flags |= TRACE_FILE_ANNOTATE; | |
2177 | ||
2178 | ||
3928a8a2 | 2179 | for_each_tracing_cpu(cpu) { |
d769041f | 2180 | |
3928a8a2 SR |
2181 | iter->buffer_iter[cpu] = |
2182 | ring_buffer_read_start(iter->tr->buffer, cpu); | |
d769041f | 2183 | |
3928a8a2 SR |
2184 | if (!iter->buffer_iter[cpu]) |
2185 | goto fail_buffer; | |
2186 | } | |
2187 | ||
bc0c38d1 SR |
2188 | /* TODO stop tracer */ |
2189 | *ret = seq_open(file, &tracer_seq_ops); | |
3928a8a2 SR |
2190 | if (*ret) |
2191 | goto fail_buffer; | |
bc0c38d1 | 2192 | |
3928a8a2 SR |
2193 | m = file->private_data; |
2194 | m->private = iter; | |
bc0c38d1 | 2195 | |
3928a8a2 | 2196 | /* stop the trace while dumping */ |
9036990d | 2197 | tracing_stop(); |
3928a8a2 SR |
2198 | |
2199 | if (iter->trace && iter->trace->open) | |
2200 | iter->trace->open(iter); | |
2201 | ||
bc0c38d1 SR |
2202 | mutex_unlock(&trace_types_lock); |
2203 | ||
2204 | out: | |
2205 | return iter; | |
3928a8a2 SR |
2206 | |
2207 | fail_buffer: | |
2208 | for_each_tracing_cpu(cpu) { | |
2209 | if (iter->buffer_iter[cpu]) | |
2210 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
2211 | } | |
2212 | mutex_unlock(&trace_types_lock); | |
0bb943c7 | 2213 | kfree(iter); |
3928a8a2 SR |
2214 | |
2215 | return ERR_PTR(-ENOMEM); | |
bc0c38d1 SR |
2216 | } |
2217 | ||
2218 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
2219 | { | |
60a11774 SR |
2220 | if (tracing_disabled) |
2221 | return -ENODEV; | |
2222 | ||
bc0c38d1 SR |
2223 | filp->private_data = inode->i_private; |
2224 | return 0; | |
2225 | } | |
2226 | ||
2227 | int tracing_release(struct inode *inode, struct file *file) | |
2228 | { | |
2229 | struct seq_file *m = (struct seq_file *)file->private_data; | |
2230 | struct trace_iterator *iter = m->private; | |
3928a8a2 | 2231 | int cpu; |
bc0c38d1 SR |
2232 | |
2233 | mutex_lock(&trace_types_lock); | |
3928a8a2 SR |
2234 | for_each_tracing_cpu(cpu) { |
2235 | if (iter->buffer_iter[cpu]) | |
2236 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
2237 | } | |
2238 | ||
bc0c38d1 SR |
2239 | if (iter->trace && iter->trace->close) |
2240 | iter->trace->close(iter); | |
2241 | ||
2242 | /* reenable tracing if it was previously enabled */ | |
9036990d | 2243 | tracing_start(); |
bc0c38d1 SR |
2244 | mutex_unlock(&trace_types_lock); |
2245 | ||
2246 | seq_release(inode, file); | |
2247 | kfree(iter); | |
2248 | return 0; | |
2249 | } | |
2250 | ||
2251 | static int tracing_open(struct inode *inode, struct file *file) | |
2252 | { | |
2253 | int ret; | |
2254 | ||
2255 | __tracing_open(inode, file, &ret); | |
2256 | ||
2257 | return ret; | |
2258 | } | |
2259 | ||
2260 | static int tracing_lt_open(struct inode *inode, struct file *file) | |
2261 | { | |
2262 | struct trace_iterator *iter; | |
2263 | int ret; | |
2264 | ||
2265 | iter = __tracing_open(inode, file, &ret); | |
2266 | ||
2267 | if (!ret) | |
2268 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
2269 | ||
2270 | return ret; | |
2271 | } | |
2272 | ||
2273 | ||
e309b41d | 2274 | static void * |
bc0c38d1 SR |
2275 | t_next(struct seq_file *m, void *v, loff_t *pos) |
2276 | { | |
2277 | struct tracer *t = m->private; | |
2278 | ||
2279 | (*pos)++; | |
2280 | ||
2281 | if (t) | |
2282 | t = t->next; | |
2283 | ||
2284 | m->private = t; | |
2285 | ||
2286 | return t; | |
2287 | } | |
2288 | ||
2289 | static void *t_start(struct seq_file *m, loff_t *pos) | |
2290 | { | |
2291 | struct tracer *t = m->private; | |
2292 | loff_t l = 0; | |
2293 | ||
2294 | mutex_lock(&trace_types_lock); | |
2295 | for (; t && l < *pos; t = t_next(m, t, &l)) | |
2296 | ; | |
2297 | ||
2298 | return t; | |
2299 | } | |
2300 | ||
2301 | static void t_stop(struct seq_file *m, void *p) | |
2302 | { | |
2303 | mutex_unlock(&trace_types_lock); | |
2304 | } | |
2305 | ||
2306 | static int t_show(struct seq_file *m, void *v) | |
2307 | { | |
2308 | struct tracer *t = v; | |
2309 | ||
2310 | if (!t) | |
2311 | return 0; | |
2312 | ||
2313 | seq_printf(m, "%s", t->name); | |
2314 | if (t->next) | |
2315 | seq_putc(m, ' '); | |
2316 | else | |
2317 | seq_putc(m, '\n'); | |
2318 | ||
2319 | return 0; | |
2320 | } | |
2321 | ||
2322 | static struct seq_operations show_traces_seq_ops = { | |
4bf39a94 IM |
2323 | .start = t_start, |
2324 | .next = t_next, | |
2325 | .stop = t_stop, | |
2326 | .show = t_show, | |
bc0c38d1 SR |
2327 | }; |
2328 | ||
2329 | static int show_traces_open(struct inode *inode, struct file *file) | |
2330 | { | |
2331 | int ret; | |
2332 | ||
60a11774 SR |
2333 | if (tracing_disabled) |
2334 | return -ENODEV; | |
2335 | ||
bc0c38d1 SR |
2336 | ret = seq_open(file, &show_traces_seq_ops); |
2337 | if (!ret) { | |
2338 | struct seq_file *m = file->private_data; | |
2339 | m->private = trace_types; | |
2340 | } | |
2341 | ||
2342 | return ret; | |
2343 | } | |
2344 | ||
2345 | static struct file_operations tracing_fops = { | |
4bf39a94 IM |
2346 | .open = tracing_open, |
2347 | .read = seq_read, | |
2348 | .llseek = seq_lseek, | |
2349 | .release = tracing_release, | |
bc0c38d1 SR |
2350 | }; |
2351 | ||
2352 | static struct file_operations tracing_lt_fops = { | |
4bf39a94 IM |
2353 | .open = tracing_lt_open, |
2354 | .read = seq_read, | |
2355 | .llseek = seq_lseek, | |
2356 | .release = tracing_release, | |
bc0c38d1 SR |
2357 | }; |
2358 | ||
2359 | static struct file_operations show_traces_fops = { | |
c7078de1 IM |
2360 | .open = show_traces_open, |
2361 | .read = seq_read, | |
2362 | .release = seq_release, | |
2363 | }; | |
2364 | ||
36dfe925 IM |
2365 | /* |
2366 | * Only trace on a CPU if the bitmask is set: | |
2367 | */ | |
2368 | static cpumask_t tracing_cpumask = CPU_MASK_ALL; | |
2369 | ||
2370 | /* | |
2371 | * When tracing/tracing_cpu_mask is modified then this holds | |
2372 | * the new bitmask we are about to install: | |
2373 | */ | |
2374 | static cpumask_t tracing_cpumask_new; | |
2375 | ||
2376 | /* | |
2377 | * The tracer itself will not take this lock, but still we want | |
2378 | * to provide a consistent cpumask to user-space: | |
2379 | */ | |
2380 | static DEFINE_MUTEX(tracing_cpumask_update_lock); | |
2381 | ||
2382 | /* | |
2383 | * Temporary storage for the character representation of the | |
2384 | * CPU bitmask (and one more byte for the newline): | |
2385 | */ | |
2386 | static char mask_str[NR_CPUS + 1]; | |
2387 | ||
c7078de1 IM |
2388 | static ssize_t |
2389 | tracing_cpumask_read(struct file *filp, char __user *ubuf, | |
2390 | size_t count, loff_t *ppos) | |
2391 | { | |
36dfe925 | 2392 | int len; |
c7078de1 IM |
2393 | |
2394 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 IM |
2395 | |
2396 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); | |
2397 | if (count - len < 2) { | |
2398 | count = -EINVAL; | |
2399 | goto out_err; | |
2400 | } | |
2401 | len += sprintf(mask_str + len, "\n"); | |
2402 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); | |
2403 | ||
2404 | out_err: | |
c7078de1 IM |
2405 | mutex_unlock(&tracing_cpumask_update_lock); |
2406 | ||
2407 | return count; | |
2408 | } | |
2409 | ||
2410 | static ssize_t | |
2411 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, | |
2412 | size_t count, loff_t *ppos) | |
2413 | { | |
36dfe925 | 2414 | int err, cpu; |
c7078de1 IM |
2415 | |
2416 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 | 2417 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
c7078de1 | 2418 | if (err) |
36dfe925 IM |
2419 | goto err_unlock; |
2420 | ||
92205c23 SR |
2421 | raw_local_irq_disable(); |
2422 | __raw_spin_lock(&ftrace_max_lock); | |
ab46428c | 2423 | for_each_tracing_cpu(cpu) { |
36dfe925 IM |
2424 | /* |
2425 | * Increase/decrease the disabled counter if we are | |
2426 | * about to flip a bit in the cpumask: | |
2427 | */ | |
2428 | if (cpu_isset(cpu, tracing_cpumask) && | |
2429 | !cpu_isset(cpu, tracing_cpumask_new)) { | |
2430 | atomic_inc(&global_trace.data[cpu]->disabled); | |
2431 | } | |
2432 | if (!cpu_isset(cpu, tracing_cpumask) && | |
2433 | cpu_isset(cpu, tracing_cpumask_new)) { | |
2434 | atomic_dec(&global_trace.data[cpu]->disabled); | |
2435 | } | |
2436 | } | |
92205c23 SR |
2437 | __raw_spin_unlock(&ftrace_max_lock); |
2438 | raw_local_irq_enable(); | |
36dfe925 IM |
2439 | |
2440 | tracing_cpumask = tracing_cpumask_new; | |
2441 | ||
2442 | mutex_unlock(&tracing_cpumask_update_lock); | |
c7078de1 IM |
2443 | |
2444 | return count; | |
36dfe925 IM |
2445 | |
2446 | err_unlock: | |
2447 | mutex_unlock(&tracing_cpumask_update_lock); | |
2448 | ||
2449 | return err; | |
c7078de1 IM |
2450 | } |
2451 | ||
2452 | static struct file_operations tracing_cpumask_fops = { | |
2453 | .open = tracing_open_generic, | |
2454 | .read = tracing_cpumask_read, | |
2455 | .write = tracing_cpumask_write, | |
bc0c38d1 SR |
2456 | }; |
2457 | ||
2458 | static ssize_t | |
ee6bce52 | 2459 | tracing_trace_options_read(struct file *filp, char __user *ubuf, |
bc0c38d1 SR |
2460 | size_t cnt, loff_t *ppos) |
2461 | { | |
adf9f195 | 2462 | int i; |
bc0c38d1 SR |
2463 | char *buf; |
2464 | int r = 0; | |
2465 | int len = 0; | |
adf9f195 FW |
2466 | u32 tracer_flags = current_trace->flags->val; |
2467 | struct tracer_opt *trace_opts = current_trace->flags->opts; | |
2468 | ||
bc0c38d1 SR |
2469 | |
2470 | /* calulate max size */ | |
2471 | for (i = 0; trace_options[i]; i++) { | |
2472 | len += strlen(trace_options[i]); | |
2473 | len += 3; /* "no" and space */ | |
2474 | } | |
2475 | ||
adf9f195 FW |
2476 | /* |
2477 | * Increase the size with names of options specific | |
2478 | * of the current tracer. | |
2479 | */ | |
2480 | for (i = 0; trace_opts[i].name; i++) { | |
2481 | len += strlen(trace_opts[i].name); | |
2482 | len += 3; /* "no" and space */ | |
2483 | } | |
2484 | ||
bc0c38d1 SR |
2485 | /* +2 for \n and \0 */ |
2486 | buf = kmalloc(len + 2, GFP_KERNEL); | |
2487 | if (!buf) | |
2488 | return -ENOMEM; | |
2489 | ||
2490 | for (i = 0; trace_options[i]; i++) { | |
2491 | if (trace_flags & (1 << i)) | |
2492 | r += sprintf(buf + r, "%s ", trace_options[i]); | |
2493 | else | |
2494 | r += sprintf(buf + r, "no%s ", trace_options[i]); | |
2495 | } | |
2496 | ||
adf9f195 FW |
2497 | for (i = 0; trace_opts[i].name; i++) { |
2498 | if (tracer_flags & trace_opts[i].bit) | |
2499 | r += sprintf(buf + r, "%s ", | |
2500 | trace_opts[i].name); | |
2501 | else | |
2502 | r += sprintf(buf + r, "no%s ", | |
2503 | trace_opts[i].name); | |
2504 | } | |
2505 | ||
bc0c38d1 SR |
2506 | r += sprintf(buf + r, "\n"); |
2507 | WARN_ON(r >= len + 2); | |
2508 | ||
36dfe925 | 2509 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2510 | |
2511 | kfree(buf); | |
2512 | ||
2513 | return r; | |
2514 | } | |
2515 | ||
adf9f195 FW |
2516 | /* Try to assign a tracer specific option */ |
2517 | static int set_tracer_option(struct tracer *trace, char *cmp, int neg) | |
2518 | { | |
2519 | struct tracer_flags *trace_flags = trace->flags; | |
2520 | struct tracer_opt *opts = NULL; | |
2521 | int ret = 0, i = 0; | |
2522 | int len; | |
2523 | ||
2524 | for (i = 0; trace_flags->opts[i].name; i++) { | |
2525 | opts = &trace_flags->opts[i]; | |
2526 | len = strlen(opts->name); | |
2527 | ||
2528 | if (strncmp(cmp, opts->name, len) == 0) { | |
2529 | ret = trace->set_flag(trace_flags->val, | |
2530 | opts->bit, !neg); | |
2531 | break; | |
2532 | } | |
2533 | } | |
2534 | /* Not found */ | |
2535 | if (!trace_flags->opts[i].name) | |
2536 | return -EINVAL; | |
2537 | ||
2538 | /* Refused to handle */ | |
2539 | if (ret) | |
2540 | return ret; | |
2541 | ||
2542 | if (neg) | |
2543 | trace_flags->val &= ~opts->bit; | |
2544 | else | |
2545 | trace_flags->val |= opts->bit; | |
2546 | ||
2547 | return 0; | |
2548 | } | |
2549 | ||
bc0c38d1 | 2550 | static ssize_t |
ee6bce52 | 2551 | tracing_trace_options_write(struct file *filp, const char __user *ubuf, |
bc0c38d1 SR |
2552 | size_t cnt, loff_t *ppos) |
2553 | { | |
2554 | char buf[64]; | |
2555 | char *cmp = buf; | |
2556 | int neg = 0; | |
adf9f195 | 2557 | int ret; |
bc0c38d1 SR |
2558 | int i; |
2559 | ||
cffae437 SR |
2560 | if (cnt >= sizeof(buf)) |
2561 | return -EINVAL; | |
bc0c38d1 SR |
2562 | |
2563 | if (copy_from_user(&buf, ubuf, cnt)) | |
2564 | return -EFAULT; | |
2565 | ||
2566 | buf[cnt] = 0; | |
2567 | ||
2568 | if (strncmp(buf, "no", 2) == 0) { | |
2569 | neg = 1; | |
2570 | cmp += 2; | |
2571 | } | |
2572 | ||
2573 | for (i = 0; trace_options[i]; i++) { | |
2574 | int len = strlen(trace_options[i]); | |
2575 | ||
2576 | if (strncmp(cmp, trace_options[i], len) == 0) { | |
2577 | if (neg) | |
2578 | trace_flags &= ~(1 << i); | |
2579 | else | |
2580 | trace_flags |= (1 << i); | |
2581 | break; | |
2582 | } | |
2583 | } | |
adf9f195 FW |
2584 | |
2585 | /* If no option could be set, test the specific tracer options */ | |
2586 | if (!trace_options[i]) { | |
2587 | ret = set_tracer_option(current_trace, cmp, neg); | |
2588 | if (ret) | |
2589 | return ret; | |
2590 | } | |
bc0c38d1 SR |
2591 | |
2592 | filp->f_pos += cnt; | |
2593 | ||
2594 | return cnt; | |
2595 | } | |
2596 | ||
2597 | static struct file_operations tracing_iter_fops = { | |
c7078de1 | 2598 | .open = tracing_open_generic, |
ee6bce52 SR |
2599 | .read = tracing_trace_options_read, |
2600 | .write = tracing_trace_options_write, | |
bc0c38d1 SR |
2601 | }; |
2602 | ||
7bd2f24c IM |
2603 | static const char readme_msg[] = |
2604 | "tracing mini-HOWTO:\n\n" | |
2605 | "# mkdir /debug\n" | |
2606 | "# mount -t debugfs nodev /debug\n\n" | |
2607 | "# cat /debug/tracing/available_tracers\n" | |
2608 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" | |
2609 | "# cat /debug/tracing/current_tracer\n" | |
2610 | "none\n" | |
2611 | "# echo sched_switch > /debug/tracing/current_tracer\n" | |
2612 | "# cat /debug/tracing/current_tracer\n" | |
2613 | "sched_switch\n" | |
ee6bce52 | 2614 | "# cat /debug/tracing/trace_options\n" |
7bd2f24c | 2615 | "noprint-parent nosym-offset nosym-addr noverbose\n" |
ee6bce52 | 2616 | "# echo print-parent > /debug/tracing/trace_options\n" |
7bd2f24c IM |
2617 | "# echo 1 > /debug/tracing/tracing_enabled\n" |
2618 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" | |
2619 | "echo 0 > /debug/tracing/tracing_enabled\n" | |
2620 | ; | |
2621 | ||
2622 | static ssize_t | |
2623 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
2624 | size_t cnt, loff_t *ppos) | |
2625 | { | |
2626 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
2627 | readme_msg, strlen(readme_msg)); | |
2628 | } | |
2629 | ||
2630 | static struct file_operations tracing_readme_fops = { | |
c7078de1 IM |
2631 | .open = tracing_open_generic, |
2632 | .read = tracing_readme_read, | |
7bd2f24c IM |
2633 | }; |
2634 | ||
bc0c38d1 SR |
2635 | static ssize_t |
2636 | tracing_ctrl_read(struct file *filp, char __user *ubuf, | |
2637 | size_t cnt, loff_t *ppos) | |
2638 | { | |
bc0c38d1 SR |
2639 | char buf[64]; |
2640 | int r; | |
2641 | ||
9036990d | 2642 | r = sprintf(buf, "%u\n", tracer_enabled); |
4e3c3333 | 2643 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2644 | } |
2645 | ||
2646 | static ssize_t | |
2647 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, | |
2648 | size_t cnt, loff_t *ppos) | |
2649 | { | |
2650 | struct trace_array *tr = filp->private_data; | |
bc0c38d1 | 2651 | char buf[64]; |
c6caeeb1 SR |
2652 | long val; |
2653 | int ret; | |
bc0c38d1 | 2654 | |
cffae437 SR |
2655 | if (cnt >= sizeof(buf)) |
2656 | return -EINVAL; | |
bc0c38d1 SR |
2657 | |
2658 | if (copy_from_user(&buf, ubuf, cnt)) | |
2659 | return -EFAULT; | |
2660 | ||
2661 | buf[cnt] = 0; | |
2662 | ||
c6caeeb1 SR |
2663 | ret = strict_strtoul(buf, 10, &val); |
2664 | if (ret < 0) | |
2665 | return ret; | |
bc0c38d1 SR |
2666 | |
2667 | val = !!val; | |
2668 | ||
2669 | mutex_lock(&trace_types_lock); | |
9036990d SR |
2670 | if (tracer_enabled ^ val) { |
2671 | if (val) { | |
bc0c38d1 | 2672 | tracer_enabled = 1; |
9036990d SR |
2673 | if (current_trace->start) |
2674 | current_trace->start(tr); | |
2675 | tracing_start(); | |
2676 | } else { | |
bc0c38d1 | 2677 | tracer_enabled = 0; |
9036990d SR |
2678 | tracing_stop(); |
2679 | if (current_trace->stop) | |
2680 | current_trace->stop(tr); | |
2681 | } | |
bc0c38d1 SR |
2682 | } |
2683 | mutex_unlock(&trace_types_lock); | |
2684 | ||
2685 | filp->f_pos += cnt; | |
2686 | ||
2687 | return cnt; | |
2688 | } | |
2689 | ||
2690 | static ssize_t | |
2691 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
2692 | size_t cnt, loff_t *ppos) | |
2693 | { | |
2694 | char buf[max_tracer_type_len+2]; | |
2695 | int r; | |
2696 | ||
2697 | mutex_lock(&trace_types_lock); | |
2698 | if (current_trace) | |
2699 | r = sprintf(buf, "%s\n", current_trace->name); | |
2700 | else | |
2701 | r = sprintf(buf, "\n"); | |
2702 | mutex_unlock(&trace_types_lock); | |
2703 | ||
4bf39a94 | 2704 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2705 | } |
2706 | ||
d9e54076 | 2707 | static int tracing_set_tracer(char *buf) |
bc0c38d1 SR |
2708 | { |
2709 | struct trace_array *tr = &global_trace; | |
2710 | struct tracer *t; | |
d9e54076 | 2711 | int ret = 0; |
bc0c38d1 SR |
2712 | |
2713 | mutex_lock(&trace_types_lock); | |
2714 | for (t = trace_types; t; t = t->next) { | |
2715 | if (strcmp(t->name, buf) == 0) | |
2716 | break; | |
2717 | } | |
c2931e05 FW |
2718 | if (!t) { |
2719 | ret = -EINVAL; | |
2720 | goto out; | |
2721 | } | |
2722 | if (t == current_trace) | |
bc0c38d1 SR |
2723 | goto out; |
2724 | ||
9f029e83 | 2725 | trace_branch_disable(); |
bc0c38d1 SR |
2726 | if (current_trace && current_trace->reset) |
2727 | current_trace->reset(tr); | |
2728 | ||
2729 | current_trace = t; | |
1c80025a FW |
2730 | if (t->init) { |
2731 | ret = t->init(tr); | |
2732 | if (ret) | |
2733 | goto out; | |
2734 | } | |
bc0c38d1 | 2735 | |
9f029e83 | 2736 | trace_branch_enable(tr); |
bc0c38d1 SR |
2737 | out: |
2738 | mutex_unlock(&trace_types_lock); | |
2739 | ||
d9e54076 PZ |
2740 | return ret; |
2741 | } | |
2742 | ||
2743 | static ssize_t | |
2744 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
2745 | size_t cnt, loff_t *ppos) | |
2746 | { | |
2747 | char buf[max_tracer_type_len+1]; | |
2748 | int i; | |
2749 | size_t ret; | |
e6e7a65a FW |
2750 | int err; |
2751 | ||
2752 | ret = cnt; | |
d9e54076 PZ |
2753 | |
2754 | if (cnt > max_tracer_type_len) | |
2755 | cnt = max_tracer_type_len; | |
2756 | ||
2757 | if (copy_from_user(&buf, ubuf, cnt)) | |
2758 | return -EFAULT; | |
2759 | ||
2760 | buf[cnt] = 0; | |
2761 | ||
2762 | /* strip ending whitespace. */ | |
2763 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
2764 | buf[i] = 0; | |
2765 | ||
e6e7a65a FW |
2766 | err = tracing_set_tracer(buf); |
2767 | if (err) | |
2768 | return err; | |
d9e54076 | 2769 | |
e6e7a65a | 2770 | filp->f_pos += ret; |
bc0c38d1 | 2771 | |
c2931e05 | 2772 | return ret; |
bc0c38d1 SR |
2773 | } |
2774 | ||
2775 | static ssize_t | |
2776 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
2777 | size_t cnt, loff_t *ppos) | |
2778 | { | |
2779 | unsigned long *ptr = filp->private_data; | |
2780 | char buf[64]; | |
2781 | int r; | |
2782 | ||
cffae437 | 2783 | r = snprintf(buf, sizeof(buf), "%ld\n", |
bc0c38d1 | 2784 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
cffae437 SR |
2785 | if (r > sizeof(buf)) |
2786 | r = sizeof(buf); | |
4bf39a94 | 2787 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2788 | } |
2789 | ||
2790 | static ssize_t | |
2791 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
2792 | size_t cnt, loff_t *ppos) | |
2793 | { | |
2794 | long *ptr = filp->private_data; | |
bc0c38d1 | 2795 | char buf[64]; |
c6caeeb1 SR |
2796 | long val; |
2797 | int ret; | |
bc0c38d1 | 2798 | |
cffae437 SR |
2799 | if (cnt >= sizeof(buf)) |
2800 | return -EINVAL; | |
bc0c38d1 SR |
2801 | |
2802 | if (copy_from_user(&buf, ubuf, cnt)) | |
2803 | return -EFAULT; | |
2804 | ||
2805 | buf[cnt] = 0; | |
2806 | ||
c6caeeb1 SR |
2807 | ret = strict_strtoul(buf, 10, &val); |
2808 | if (ret < 0) | |
2809 | return ret; | |
bc0c38d1 SR |
2810 | |
2811 | *ptr = val * 1000; | |
2812 | ||
2813 | return cnt; | |
2814 | } | |
2815 | ||
b3806b43 SR |
2816 | static atomic_t tracing_reader; |
2817 | ||
2818 | static int tracing_open_pipe(struct inode *inode, struct file *filp) | |
2819 | { | |
2820 | struct trace_iterator *iter; | |
2821 | ||
2822 | if (tracing_disabled) | |
2823 | return -ENODEV; | |
2824 | ||
2825 | /* We only allow for reader of the pipe */ | |
2826 | if (atomic_inc_return(&tracing_reader) != 1) { | |
2827 | atomic_dec(&tracing_reader); | |
2828 | return -EBUSY; | |
2829 | } | |
2830 | ||
2831 | /* create a buffer to store the information to pass to userspace */ | |
2832 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
2833 | if (!iter) | |
2834 | return -ENOMEM; | |
2835 | ||
107bad8b | 2836 | mutex_lock(&trace_types_lock); |
a309720c SR |
2837 | |
2838 | /* trace pipe does not show start of buffer */ | |
2839 | cpus_setall(iter->started); | |
2840 | ||
b3806b43 | 2841 | iter->tr = &global_trace; |
72829bc3 | 2842 | iter->trace = current_trace; |
b3806b43 SR |
2843 | filp->private_data = iter; |
2844 | ||
107bad8b SR |
2845 | if (iter->trace->pipe_open) |
2846 | iter->trace->pipe_open(iter); | |
2847 | mutex_unlock(&trace_types_lock); | |
2848 | ||
b3806b43 SR |
2849 | return 0; |
2850 | } | |
2851 | ||
2852 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
2853 | { | |
2854 | struct trace_iterator *iter = file->private_data; | |
2855 | ||
2856 | kfree(iter); | |
2857 | atomic_dec(&tracing_reader); | |
2858 | ||
2859 | return 0; | |
2860 | } | |
2861 | ||
2a2cc8f7 SSP |
2862 | static unsigned int |
2863 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) | |
2864 | { | |
2865 | struct trace_iterator *iter = filp->private_data; | |
2866 | ||
2867 | if (trace_flags & TRACE_ITER_BLOCK) { | |
2868 | /* | |
2869 | * Always select as readable when in blocking mode | |
2870 | */ | |
2871 | return POLLIN | POLLRDNORM; | |
afc2abc0 | 2872 | } else { |
2a2cc8f7 SSP |
2873 | if (!trace_empty(iter)) |
2874 | return POLLIN | POLLRDNORM; | |
2875 | poll_wait(filp, &trace_wait, poll_table); | |
2876 | if (!trace_empty(iter)) | |
2877 | return POLLIN | POLLRDNORM; | |
2878 | ||
2879 | return 0; | |
2880 | } | |
2881 | } | |
2882 | ||
b3806b43 SR |
2883 | /* |
2884 | * Consumer reader. | |
2885 | */ | |
2886 | static ssize_t | |
2887 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
2888 | size_t cnt, loff_t *ppos) | |
2889 | { | |
2890 | struct trace_iterator *iter = filp->private_data; | |
6c6c2796 | 2891 | ssize_t sret; |
b3806b43 SR |
2892 | |
2893 | /* return any leftover data */ | |
6c6c2796 PP |
2894 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
2895 | if (sret != -EBUSY) | |
2896 | return sret; | |
b3806b43 | 2897 | |
6c6c2796 | 2898 | trace_seq_reset(&iter->seq); |
b3806b43 | 2899 | |
107bad8b SR |
2900 | mutex_lock(&trace_types_lock); |
2901 | if (iter->trace->read) { | |
6c6c2796 PP |
2902 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); |
2903 | if (sret) | |
107bad8b | 2904 | goto out; |
107bad8b SR |
2905 | } |
2906 | ||
9ff4b974 PP |
2907 | waitagain: |
2908 | sret = 0; | |
b3806b43 | 2909 | while (trace_empty(iter)) { |
2dc8f095 | 2910 | |
107bad8b | 2911 | if ((filp->f_flags & O_NONBLOCK)) { |
6c6c2796 | 2912 | sret = -EAGAIN; |
107bad8b SR |
2913 | goto out; |
2914 | } | |
2dc8f095 | 2915 | |
b3806b43 SR |
2916 | /* |
2917 | * This is a make-shift waitqueue. The reason we don't use | |
2918 | * an actual wait queue is because: | |
2919 | * 1) we only ever have one waiter | |
2920 | * 2) the tracing, traces all functions, we don't want | |
2921 | * the overhead of calling wake_up and friends | |
2922 | * (and tracing them too) | |
2923 | * Anyway, this is really very primitive wakeup. | |
2924 | */ | |
2925 | set_current_state(TASK_INTERRUPTIBLE); | |
2926 | iter->tr->waiter = current; | |
2927 | ||
107bad8b SR |
2928 | mutex_unlock(&trace_types_lock); |
2929 | ||
9fe068e9 IM |
2930 | /* sleep for 100 msecs, and try again. */ |
2931 | schedule_timeout(HZ/10); | |
b3806b43 | 2932 | |
107bad8b SR |
2933 | mutex_lock(&trace_types_lock); |
2934 | ||
b3806b43 SR |
2935 | iter->tr->waiter = NULL; |
2936 | ||
107bad8b | 2937 | if (signal_pending(current)) { |
6c6c2796 | 2938 | sret = -EINTR; |
107bad8b SR |
2939 | goto out; |
2940 | } | |
b3806b43 | 2941 | |
84527997 | 2942 | if (iter->trace != current_trace) |
107bad8b | 2943 | goto out; |
84527997 | 2944 | |
b3806b43 SR |
2945 | /* |
2946 | * We block until we read something and tracing is disabled. | |
2947 | * We still block if tracing is disabled, but we have never | |
2948 | * read anything. This allows a user to cat this file, and | |
2949 | * then enable tracing. But after we have read something, | |
2950 | * we give an EOF when tracing is again disabled. | |
2951 | * | |
2952 | * iter->pos will be 0 if we haven't read anything. | |
2953 | */ | |
2954 | if (!tracer_enabled && iter->pos) | |
2955 | break; | |
2956 | ||
2957 | continue; | |
2958 | } | |
2959 | ||
2960 | /* stop when tracing is finished */ | |
2961 | if (trace_empty(iter)) | |
107bad8b | 2962 | goto out; |
b3806b43 SR |
2963 | |
2964 | if (cnt >= PAGE_SIZE) | |
2965 | cnt = PAGE_SIZE - 1; | |
2966 | ||
53d0aa77 | 2967 | /* reset all but tr, trace, and overruns */ |
53d0aa77 SR |
2968 | memset(&iter->seq, 0, |
2969 | sizeof(struct trace_iterator) - | |
2970 | offsetof(struct trace_iterator, seq)); | |
4823ed7e | 2971 | iter->pos = -1; |
b3806b43 | 2972 | |
088b1e42 | 2973 | while (find_next_entry_inc(iter) != NULL) { |
2c4f035f | 2974 | enum print_line_t ret; |
088b1e42 SR |
2975 | int len = iter->seq.len; |
2976 | ||
f9896bf3 | 2977 | ret = print_trace_line(iter); |
2c4f035f | 2978 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
088b1e42 SR |
2979 | /* don't print partial lines */ |
2980 | iter->seq.len = len; | |
b3806b43 | 2981 | break; |
088b1e42 | 2982 | } |
b3806b43 SR |
2983 | |
2984 | trace_consume(iter); | |
2985 | ||
2986 | if (iter->seq.len >= cnt) | |
2987 | break; | |
b3806b43 SR |
2988 | } |
2989 | ||
b3806b43 | 2990 | /* Now copy what we have to the user */ |
6c6c2796 PP |
2991 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
2992 | if (iter->seq.readpos >= iter->seq.len) | |
b3806b43 | 2993 | trace_seq_reset(&iter->seq); |
9ff4b974 PP |
2994 | |
2995 | /* | |
2996 | * If there was nothing to send to user, inspite of consuming trace | |
2997 | * entries, go back to wait for more entries. | |
2998 | */ | |
6c6c2796 | 2999 | if (sret == -EBUSY) |
9ff4b974 | 3000 | goto waitagain; |
b3806b43 | 3001 | |
107bad8b SR |
3002 | out: |
3003 | mutex_unlock(&trace_types_lock); | |
3004 | ||
6c6c2796 | 3005 | return sret; |
b3806b43 SR |
3006 | } |
3007 | ||
a98a3c3f SR |
3008 | static ssize_t |
3009 | tracing_entries_read(struct file *filp, char __user *ubuf, | |
3010 | size_t cnt, loff_t *ppos) | |
3011 | { | |
3012 | struct trace_array *tr = filp->private_data; | |
3013 | char buf[64]; | |
3014 | int r; | |
3015 | ||
1696b2b0 | 3016 | r = sprintf(buf, "%lu\n", tr->entries >> 10); |
a98a3c3f SR |
3017 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
3018 | } | |
3019 | ||
3020 | static ssize_t | |
3021 | tracing_entries_write(struct file *filp, const char __user *ubuf, | |
3022 | size_t cnt, loff_t *ppos) | |
3023 | { | |
3024 | unsigned long val; | |
3025 | char buf[64]; | |
bf5e6519 | 3026 | int ret, cpu; |
a98a3c3f | 3027 | |
cffae437 SR |
3028 | if (cnt >= sizeof(buf)) |
3029 | return -EINVAL; | |
a98a3c3f SR |
3030 | |
3031 | if (copy_from_user(&buf, ubuf, cnt)) | |
3032 | return -EFAULT; | |
3033 | ||
3034 | buf[cnt] = 0; | |
3035 | ||
c6caeeb1 SR |
3036 | ret = strict_strtoul(buf, 10, &val); |
3037 | if (ret < 0) | |
3038 | return ret; | |
a98a3c3f SR |
3039 | |
3040 | /* must have at least 1 entry */ | |
3041 | if (!val) | |
3042 | return -EINVAL; | |
3043 | ||
3044 | mutex_lock(&trace_types_lock); | |
3045 | ||
c76f0694 | 3046 | tracing_stop(); |
a98a3c3f | 3047 | |
bf5e6519 SR |
3048 | /* disable all cpu buffers */ |
3049 | for_each_tracing_cpu(cpu) { | |
3050 | if (global_trace.data[cpu]) | |
3051 | atomic_inc(&global_trace.data[cpu]->disabled); | |
3052 | if (max_tr.data[cpu]) | |
3053 | atomic_inc(&max_tr.data[cpu]->disabled); | |
3054 | } | |
3055 | ||
1696b2b0 SR |
3056 | /* value is in KB */ |
3057 | val <<= 10; | |
3058 | ||
3928a8a2 SR |
3059 | if (val != global_trace.entries) { |
3060 | ret = ring_buffer_resize(global_trace.buffer, val); | |
3061 | if (ret < 0) { | |
3062 | cnt = ret; | |
3eefae99 SR |
3063 | goto out; |
3064 | } | |
3065 | ||
3928a8a2 SR |
3066 | ret = ring_buffer_resize(max_tr.buffer, val); |
3067 | if (ret < 0) { | |
3068 | int r; | |
3069 | cnt = ret; | |
3070 | r = ring_buffer_resize(global_trace.buffer, | |
3071 | global_trace.entries); | |
3072 | if (r < 0) { | |
3073 | /* AARGH! We are left with different | |
3074 | * size max buffer!!!! */ | |
3075 | WARN_ON(1); | |
3076 | tracing_disabled = 1; | |
a98a3c3f | 3077 | } |
3928a8a2 | 3078 | goto out; |
a98a3c3f | 3079 | } |
3eefae99 | 3080 | |
3928a8a2 | 3081 | global_trace.entries = val; |
a98a3c3f SR |
3082 | } |
3083 | ||
3084 | filp->f_pos += cnt; | |
3085 | ||
19384c03 SR |
3086 | /* If check pages failed, return ENOMEM */ |
3087 | if (tracing_disabled) | |
3088 | cnt = -ENOMEM; | |
a98a3c3f | 3089 | out: |
bf5e6519 SR |
3090 | for_each_tracing_cpu(cpu) { |
3091 | if (global_trace.data[cpu]) | |
3092 | atomic_dec(&global_trace.data[cpu]->disabled); | |
3093 | if (max_tr.data[cpu]) | |
3094 | atomic_dec(&max_tr.data[cpu]->disabled); | |
3095 | } | |
3096 | ||
c76f0694 | 3097 | tracing_start(); |
a98a3c3f SR |
3098 | max_tr.entries = global_trace.entries; |
3099 | mutex_unlock(&trace_types_lock); | |
3100 | ||
3101 | return cnt; | |
3102 | } | |
3103 | ||
5bf9a1ee PP |
3104 | static int mark_printk(const char *fmt, ...) |
3105 | { | |
3106 | int ret; | |
3107 | va_list args; | |
3108 | va_start(args, fmt); | |
3109 | ret = trace_vprintk(0, fmt, args); | |
3110 | va_end(args); | |
3111 | return ret; | |
3112 | } | |
3113 | ||
3114 | static ssize_t | |
3115 | tracing_mark_write(struct file *filp, const char __user *ubuf, | |
3116 | size_t cnt, loff_t *fpos) | |
3117 | { | |
3118 | char *buf; | |
3119 | char *end; | |
5bf9a1ee | 3120 | |
c76f0694 | 3121 | if (tracing_disabled) |
5bf9a1ee PP |
3122 | return -EINVAL; |
3123 | ||
3124 | if (cnt > TRACE_BUF_SIZE) | |
3125 | cnt = TRACE_BUF_SIZE; | |
3126 | ||
3127 | buf = kmalloc(cnt + 1, GFP_KERNEL); | |
3128 | if (buf == NULL) | |
3129 | return -ENOMEM; | |
3130 | ||
3131 | if (copy_from_user(buf, ubuf, cnt)) { | |
3132 | kfree(buf); | |
3133 | return -EFAULT; | |
3134 | } | |
3135 | ||
3136 | /* Cut from the first nil or newline. */ | |
3137 | buf[cnt] = '\0'; | |
3138 | end = strchr(buf, '\n'); | |
3139 | if (end) | |
3140 | *end = '\0'; | |
3141 | ||
3142 | cnt = mark_printk("%s\n", buf); | |
3143 | kfree(buf); | |
3144 | *fpos += cnt; | |
3145 | ||
3146 | return cnt; | |
3147 | } | |
3148 | ||
bc0c38d1 | 3149 | static struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
3150 | .open = tracing_open_generic, |
3151 | .read = tracing_max_lat_read, | |
3152 | .write = tracing_max_lat_write, | |
bc0c38d1 SR |
3153 | }; |
3154 | ||
3155 | static struct file_operations tracing_ctrl_fops = { | |
4bf39a94 IM |
3156 | .open = tracing_open_generic, |
3157 | .read = tracing_ctrl_read, | |
3158 | .write = tracing_ctrl_write, | |
bc0c38d1 SR |
3159 | }; |
3160 | ||
3161 | static struct file_operations set_tracer_fops = { | |
4bf39a94 IM |
3162 | .open = tracing_open_generic, |
3163 | .read = tracing_set_trace_read, | |
3164 | .write = tracing_set_trace_write, | |
bc0c38d1 SR |
3165 | }; |
3166 | ||
b3806b43 | 3167 | static struct file_operations tracing_pipe_fops = { |
4bf39a94 | 3168 | .open = tracing_open_pipe, |
2a2cc8f7 | 3169 | .poll = tracing_poll_pipe, |
4bf39a94 IM |
3170 | .read = tracing_read_pipe, |
3171 | .release = tracing_release_pipe, | |
b3806b43 SR |
3172 | }; |
3173 | ||
a98a3c3f SR |
3174 | static struct file_operations tracing_entries_fops = { |
3175 | .open = tracing_open_generic, | |
3176 | .read = tracing_entries_read, | |
3177 | .write = tracing_entries_write, | |
3178 | }; | |
3179 | ||
5bf9a1ee | 3180 | static struct file_operations tracing_mark_fops = { |
43a15386 | 3181 | .open = tracing_open_generic, |
5bf9a1ee PP |
3182 | .write = tracing_mark_write, |
3183 | }; | |
3184 | ||
bc0c38d1 SR |
3185 | #ifdef CONFIG_DYNAMIC_FTRACE |
3186 | ||
b807c3d0 SR |
3187 | int __weak ftrace_arch_read_dyn_info(char *buf, int size) |
3188 | { | |
3189 | return 0; | |
3190 | } | |
3191 | ||
bc0c38d1 | 3192 | static ssize_t |
b807c3d0 | 3193 | tracing_read_dyn_info(struct file *filp, char __user *ubuf, |
bc0c38d1 SR |
3194 | size_t cnt, loff_t *ppos) |
3195 | { | |
a26a2a27 SR |
3196 | static char ftrace_dyn_info_buffer[1024]; |
3197 | static DEFINE_MUTEX(dyn_info_mutex); | |
bc0c38d1 | 3198 | unsigned long *p = filp->private_data; |
b807c3d0 | 3199 | char *buf = ftrace_dyn_info_buffer; |
a26a2a27 | 3200 | int size = ARRAY_SIZE(ftrace_dyn_info_buffer); |
bc0c38d1 SR |
3201 | int r; |
3202 | ||
b807c3d0 SR |
3203 | mutex_lock(&dyn_info_mutex); |
3204 | r = sprintf(buf, "%ld ", *p); | |
4bf39a94 | 3205 | |
a26a2a27 | 3206 | r += ftrace_arch_read_dyn_info(buf+r, (size-1)-r); |
b807c3d0 SR |
3207 | buf[r++] = '\n'; |
3208 | ||
3209 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
3210 | ||
3211 | mutex_unlock(&dyn_info_mutex); | |
3212 | ||
3213 | return r; | |
bc0c38d1 SR |
3214 | } |
3215 | ||
b807c3d0 | 3216 | static struct file_operations tracing_dyn_info_fops = { |
4bf39a94 | 3217 | .open = tracing_open_generic, |
b807c3d0 | 3218 | .read = tracing_read_dyn_info, |
bc0c38d1 SR |
3219 | }; |
3220 | #endif | |
3221 | ||
3222 | static struct dentry *d_tracer; | |
3223 | ||
3224 | struct dentry *tracing_init_dentry(void) | |
3225 | { | |
3226 | static int once; | |
3227 | ||
3228 | if (d_tracer) | |
3229 | return d_tracer; | |
3230 | ||
3231 | d_tracer = debugfs_create_dir("tracing", NULL); | |
3232 | ||
3233 | if (!d_tracer && !once) { | |
3234 | once = 1; | |
3235 | pr_warning("Could not create debugfs directory 'tracing'\n"); | |
3236 | return NULL; | |
3237 | } | |
3238 | ||
3239 | return d_tracer; | |
3240 | } | |
3241 | ||
60a11774 SR |
3242 | #ifdef CONFIG_FTRACE_SELFTEST |
3243 | /* Let selftest have access to static functions in this file */ | |
3244 | #include "trace_selftest.c" | |
3245 | #endif | |
3246 | ||
b5ad384e | 3247 | static __init int tracer_init_debugfs(void) |
bc0c38d1 SR |
3248 | { |
3249 | struct dentry *d_tracer; | |
3250 | struct dentry *entry; | |
3251 | ||
3252 | d_tracer = tracing_init_dentry(); | |
3253 | ||
3254 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, | |
3255 | &global_trace, &tracing_ctrl_fops); | |
3256 | if (!entry) | |
3257 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); | |
3258 | ||
ee6bce52 | 3259 | entry = debugfs_create_file("trace_options", 0644, d_tracer, |
bc0c38d1 SR |
3260 | NULL, &tracing_iter_fops); |
3261 | if (!entry) | |
ee6bce52 | 3262 | pr_warning("Could not create debugfs 'trace_options' entry\n"); |
bc0c38d1 | 3263 | |
c7078de1 IM |
3264 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
3265 | NULL, &tracing_cpumask_fops); | |
3266 | if (!entry) | |
3267 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); | |
3268 | ||
bc0c38d1 SR |
3269 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
3270 | &global_trace, &tracing_lt_fops); | |
3271 | if (!entry) | |
3272 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); | |
3273 | ||
3274 | entry = debugfs_create_file("trace", 0444, d_tracer, | |
3275 | &global_trace, &tracing_fops); | |
3276 | if (!entry) | |
3277 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
3278 | ||
3279 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, | |
3280 | &global_trace, &show_traces_fops); | |
3281 | if (!entry) | |
98a983aa | 3282 | pr_warning("Could not create debugfs 'available_tracers' entry\n"); |
bc0c38d1 SR |
3283 | |
3284 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, | |
3285 | &global_trace, &set_tracer_fops); | |
3286 | if (!entry) | |
98a983aa | 3287 | pr_warning("Could not create debugfs 'current_tracer' entry\n"); |
bc0c38d1 SR |
3288 | |
3289 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, | |
3290 | &tracing_max_latency, | |
3291 | &tracing_max_lat_fops); | |
3292 | if (!entry) | |
3293 | pr_warning("Could not create debugfs " | |
3294 | "'tracing_max_latency' entry\n"); | |
3295 | ||
3296 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, | |
3297 | &tracing_thresh, &tracing_max_lat_fops); | |
3298 | if (!entry) | |
3299 | pr_warning("Could not create debugfs " | |
98a983aa | 3300 | "'tracing_thresh' entry\n"); |
7bd2f24c IM |
3301 | entry = debugfs_create_file("README", 0644, d_tracer, |
3302 | NULL, &tracing_readme_fops); | |
3303 | if (!entry) | |
3304 | pr_warning("Could not create debugfs 'README' entry\n"); | |
3305 | ||
b3806b43 SR |
3306 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
3307 | NULL, &tracing_pipe_fops); | |
3308 | if (!entry) | |
3309 | pr_warning("Could not create debugfs " | |
98a983aa | 3310 | "'trace_pipe' entry\n"); |
bc0c38d1 | 3311 | |
a94c80e7 | 3312 | entry = debugfs_create_file("buffer_size_kb", 0644, d_tracer, |
a98a3c3f SR |
3313 | &global_trace, &tracing_entries_fops); |
3314 | if (!entry) | |
3315 | pr_warning("Could not create debugfs " | |
a94c80e7 | 3316 | "'buffer_size_kb' entry\n"); |
a98a3c3f | 3317 | |
5bf9a1ee PP |
3318 | entry = debugfs_create_file("trace_marker", 0220, d_tracer, |
3319 | NULL, &tracing_mark_fops); | |
3320 | if (!entry) | |
3321 | pr_warning("Could not create debugfs " | |
3322 | "'trace_marker' entry\n"); | |
3323 | ||
bc0c38d1 SR |
3324 | #ifdef CONFIG_DYNAMIC_FTRACE |
3325 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, | |
3326 | &ftrace_update_tot_cnt, | |
b807c3d0 | 3327 | &tracing_dyn_info_fops); |
bc0c38d1 SR |
3328 | if (!entry) |
3329 | pr_warning("Could not create debugfs " | |
3330 | "'dyn_ftrace_total_info' entry\n"); | |
3331 | #endif | |
d618b3e6 IM |
3332 | #ifdef CONFIG_SYSPROF_TRACER |
3333 | init_tracer_sysprof_debugfs(d_tracer); | |
3334 | #endif | |
b5ad384e | 3335 | return 0; |
bc0c38d1 SR |
3336 | } |
3337 | ||
801fe400 | 3338 | int trace_vprintk(unsigned long ip, const char *fmt, va_list args) |
dd0e545f | 3339 | { |
dd0e545f SR |
3340 | static DEFINE_SPINLOCK(trace_buf_lock); |
3341 | static char trace_buf[TRACE_BUF_SIZE]; | |
f09ce573 | 3342 | |
3928a8a2 | 3343 | struct ring_buffer_event *event; |
f09ce573 | 3344 | struct trace_array *tr = &global_trace; |
dd0e545f | 3345 | struct trace_array_cpu *data; |
777e208d | 3346 | struct print_entry *entry; |
3928a8a2 | 3347 | unsigned long flags, irq_flags; |
38697053 | 3348 | int cpu, len = 0, size, pc; |
dd0e545f | 3349 | |
c76f0694 | 3350 | if (tracing_disabled) |
dd0e545f SR |
3351 | return 0; |
3352 | ||
38697053 SR |
3353 | pc = preempt_count(); |
3354 | preempt_disable_notrace(); | |
dd0e545f SR |
3355 | cpu = raw_smp_processor_id(); |
3356 | data = tr->data[cpu]; | |
dd0e545f | 3357 | |
3ea2e6d7 | 3358 | if (unlikely(atomic_read(&data->disabled))) |
dd0e545f SR |
3359 | goto out; |
3360 | ||
38697053 | 3361 | spin_lock_irqsave(&trace_buf_lock, flags); |
801fe400 | 3362 | len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args); |
dd0e545f SR |
3363 | |
3364 | len = min(len, TRACE_BUF_SIZE-1); | |
3365 | trace_buf[len] = 0; | |
3366 | ||
777e208d SR |
3367 | size = sizeof(*entry) + len + 1; |
3368 | event = ring_buffer_lock_reserve(tr->buffer, size, &irq_flags); | |
3928a8a2 SR |
3369 | if (!event) |
3370 | goto out_unlock; | |
777e208d | 3371 | entry = ring_buffer_event_data(event); |
38697053 | 3372 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
3373 | entry->ent.type = TRACE_PRINT; |
3374 | entry->ip = ip; | |
dd0e545f | 3375 | |
777e208d SR |
3376 | memcpy(&entry->buf, trace_buf, len); |
3377 | entry->buf[len] = 0; | |
3928a8a2 | 3378 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
dd0e545f | 3379 | |
3928a8a2 | 3380 | out_unlock: |
38697053 | 3381 | spin_unlock_irqrestore(&trace_buf_lock, flags); |
dd0e545f SR |
3382 | |
3383 | out: | |
38697053 | 3384 | preempt_enable_notrace(); |
dd0e545f SR |
3385 | |
3386 | return len; | |
3387 | } | |
801fe400 PP |
3388 | EXPORT_SYMBOL_GPL(trace_vprintk); |
3389 | ||
3390 | int __ftrace_printk(unsigned long ip, const char *fmt, ...) | |
3391 | { | |
3392 | int ret; | |
3393 | va_list ap; | |
3394 | ||
3395 | if (!(trace_flags & TRACE_ITER_PRINTK)) | |
3396 | return 0; | |
3397 | ||
3398 | va_start(ap, fmt); | |
3399 | ret = trace_vprintk(ip, fmt, ap); | |
3400 | va_end(ap); | |
3401 | return ret; | |
3402 | } | |
dd0e545f SR |
3403 | EXPORT_SYMBOL_GPL(__ftrace_printk); |
3404 | ||
3f5a54e3 SR |
3405 | static int trace_panic_handler(struct notifier_block *this, |
3406 | unsigned long event, void *unused) | |
3407 | { | |
944ac425 SR |
3408 | if (ftrace_dump_on_oops) |
3409 | ftrace_dump(); | |
3f5a54e3 SR |
3410 | return NOTIFY_OK; |
3411 | } | |
3412 | ||
3413 | static struct notifier_block trace_panic_notifier = { | |
3414 | .notifier_call = trace_panic_handler, | |
3415 | .next = NULL, | |
3416 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ | |
3417 | }; | |
3418 | ||
3419 | static int trace_die_handler(struct notifier_block *self, | |
3420 | unsigned long val, | |
3421 | void *data) | |
3422 | { | |
3423 | switch (val) { | |
3424 | case DIE_OOPS: | |
944ac425 SR |
3425 | if (ftrace_dump_on_oops) |
3426 | ftrace_dump(); | |
3f5a54e3 SR |
3427 | break; |
3428 | default: | |
3429 | break; | |
3430 | } | |
3431 | return NOTIFY_OK; | |
3432 | } | |
3433 | ||
3434 | static struct notifier_block trace_die_notifier = { | |
3435 | .notifier_call = trace_die_handler, | |
3436 | .priority = 200 | |
3437 | }; | |
3438 | ||
3439 | /* | |
3440 | * printk is set to max of 1024, we really don't need it that big. | |
3441 | * Nothing should be printing 1000 characters anyway. | |
3442 | */ | |
3443 | #define TRACE_MAX_PRINT 1000 | |
3444 | ||
3445 | /* | |
3446 | * Define here KERN_TRACE so that we have one place to modify | |
3447 | * it if we decide to change what log level the ftrace dump | |
3448 | * should be at. | |
3449 | */ | |
3450 | #define KERN_TRACE KERN_INFO | |
3451 | ||
3452 | static void | |
3453 | trace_printk_seq(struct trace_seq *s) | |
3454 | { | |
3455 | /* Probably should print a warning here. */ | |
3456 | if (s->len >= 1000) | |
3457 | s->len = 1000; | |
3458 | ||
3459 | /* should be zero ended, but we are paranoid. */ | |
3460 | s->buffer[s->len] = 0; | |
3461 | ||
3462 | printk(KERN_TRACE "%s", s->buffer); | |
3463 | ||
3464 | trace_seq_reset(s); | |
3465 | } | |
3466 | ||
3f5a54e3 SR |
3467 | void ftrace_dump(void) |
3468 | { | |
3469 | static DEFINE_SPINLOCK(ftrace_dump_lock); | |
3470 | /* use static because iter can be a bit big for the stack */ | |
3471 | static struct trace_iterator iter; | |
3f5a54e3 SR |
3472 | static cpumask_t mask; |
3473 | static int dump_ran; | |
d769041f SR |
3474 | unsigned long flags; |
3475 | int cnt = 0, cpu; | |
3f5a54e3 SR |
3476 | |
3477 | /* only one dump */ | |
3478 | spin_lock_irqsave(&ftrace_dump_lock, flags); | |
3479 | if (dump_ran) | |
3480 | goto out; | |
3481 | ||
3482 | dump_ran = 1; | |
3483 | ||
3484 | /* No turning back! */ | |
81adbdc0 | 3485 | ftrace_kill(); |
3f5a54e3 | 3486 | |
d769041f SR |
3487 | for_each_tracing_cpu(cpu) { |
3488 | atomic_inc(&global_trace.data[cpu]->disabled); | |
3489 | } | |
3490 | ||
3f5a54e3 SR |
3491 | printk(KERN_TRACE "Dumping ftrace buffer:\n"); |
3492 | ||
3493 | iter.tr = &global_trace; | |
3494 | iter.trace = current_trace; | |
3495 | ||
3496 | /* | |
3497 | * We need to stop all tracing on all CPUS to read the | |
3498 | * the next buffer. This is a bit expensive, but is | |
3499 | * not done often. We fill all what we can read, | |
3500 | * and then release the locks again. | |
3501 | */ | |
3502 | ||
3503 | cpus_clear(mask); | |
3504 | ||
3f5a54e3 SR |
3505 | while (!trace_empty(&iter)) { |
3506 | ||
3507 | if (!cnt) | |
3508 | printk(KERN_TRACE "---------------------------------\n"); | |
3509 | ||
3510 | cnt++; | |
3511 | ||
3512 | /* reset all but tr, trace, and overruns */ | |
3513 | memset(&iter.seq, 0, | |
3514 | sizeof(struct trace_iterator) - | |
3515 | offsetof(struct trace_iterator, seq)); | |
3516 | iter.iter_flags |= TRACE_FILE_LAT_FMT; | |
3517 | iter.pos = -1; | |
3518 | ||
3519 | if (find_next_entry_inc(&iter) != NULL) { | |
3520 | print_trace_line(&iter); | |
3521 | trace_consume(&iter); | |
3522 | } | |
3523 | ||
3524 | trace_printk_seq(&iter.seq); | |
3525 | } | |
3526 | ||
3527 | if (!cnt) | |
3528 | printk(KERN_TRACE " (ftrace buffer empty)\n"); | |
3529 | else | |
3530 | printk(KERN_TRACE "---------------------------------\n"); | |
3531 | ||
3f5a54e3 SR |
3532 | out: |
3533 | spin_unlock_irqrestore(&ftrace_dump_lock, flags); | |
3534 | } | |
3535 | ||
3928a8a2 | 3536 | __init static int tracer_alloc_buffers(void) |
bc0c38d1 | 3537 | { |
4c11d7ae | 3538 | struct trace_array_cpu *data; |
4c11d7ae SR |
3539 | int i; |
3540 | ||
3928a8a2 SR |
3541 | /* TODO: make the number of buffers hot pluggable with CPUS */ |
3542 | tracing_buffer_mask = cpu_possible_map; | |
4c11d7ae | 3543 | |
3928a8a2 SR |
3544 | global_trace.buffer = ring_buffer_alloc(trace_buf_size, |
3545 | TRACE_BUFFER_FLAGS); | |
3546 | if (!global_trace.buffer) { | |
3547 | printk(KERN_ERR "tracer: failed to allocate ring buffer!\n"); | |
3548 | WARN_ON(1); | |
3549 | return 0; | |
4c11d7ae | 3550 | } |
3928a8a2 | 3551 | global_trace.entries = ring_buffer_size(global_trace.buffer); |
4c11d7ae SR |
3552 | |
3553 | #ifdef CONFIG_TRACER_MAX_TRACE | |
3928a8a2 SR |
3554 | max_tr.buffer = ring_buffer_alloc(trace_buf_size, |
3555 | TRACE_BUFFER_FLAGS); | |
3556 | if (!max_tr.buffer) { | |
3557 | printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n"); | |
3558 | WARN_ON(1); | |
3559 | ring_buffer_free(global_trace.buffer); | |
3560 | return 0; | |
4c11d7ae | 3561 | } |
3928a8a2 SR |
3562 | max_tr.entries = ring_buffer_size(max_tr.buffer); |
3563 | WARN_ON(max_tr.entries != global_trace.entries); | |
a98a3c3f | 3564 | #endif |
ab46428c | 3565 | |
4c11d7ae | 3566 | /* Allocate the first page for all buffers */ |
ab46428c | 3567 | for_each_tracing_cpu(i) { |
4c11d7ae | 3568 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
bc0c38d1 | 3569 | max_tr.data[i] = &per_cpu(max_data, i); |
4c11d7ae | 3570 | } |
bc0c38d1 | 3571 | |
bc0c38d1 SR |
3572 | trace_init_cmdlines(); |
3573 | ||
43a15386 | 3574 | register_tracer(&nop_trace); |
b5ad384e FW |
3575 | #ifdef CONFIG_BOOT_TRACER |
3576 | register_tracer(&boot_tracer); | |
3577 | current_trace = &boot_tracer; | |
3578 | current_trace->init(&global_trace); | |
3579 | #else | |
43a15386 | 3580 | current_trace = &nop_trace; |
b5ad384e | 3581 | #endif |
bc0c38d1 | 3582 | |
60a11774 SR |
3583 | /* All seems OK, enable tracing */ |
3584 | tracing_disabled = 0; | |
3928a8a2 | 3585 | |
3f5a54e3 SR |
3586 | atomic_notifier_chain_register(&panic_notifier_list, |
3587 | &trace_panic_notifier); | |
3588 | ||
3589 | register_die_notifier(&trace_die_notifier); | |
3590 | ||
bc0c38d1 | 3591 | return 0; |
bc0c38d1 | 3592 | } |
b5ad384e FW |
3593 | early_initcall(tracer_alloc_buffers); |
3594 | fs_initcall(tracer_init_debugfs); |