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Commit | Line | Data |
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bc0c38d1 SR |
1 | /* |
2 | * ring buffer based function tracer | |
3 | * | |
4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> | |
5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> | |
6 | * | |
7 | * Originally taken from the RT patch by: | |
8 | * Arnaldo Carvalho de Melo <acme@redhat.com> | |
9 | * | |
10 | * Based on code from the latency_tracer, that is: | |
11 | * Copyright (C) 2004-2006 Ingo Molnar | |
12 | * Copyright (C) 2004 William Lee Irwin III | |
13 | */ | |
14 | #include <linux/utsrelease.h> | |
15 | #include <linux/kallsyms.h> | |
16 | #include <linux/seq_file.h> | |
3f5a54e3 | 17 | #include <linux/notifier.h> |
bc0c38d1 | 18 | #include <linux/debugfs.h> |
4c11d7ae | 19 | #include <linux/pagemap.h> |
bc0c38d1 SR |
20 | #include <linux/hardirq.h> |
21 | #include <linux/linkage.h> | |
22 | #include <linux/uaccess.h> | |
23 | #include <linux/ftrace.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/percpu.h> | |
3f5a54e3 | 26 | #include <linux/kdebug.h> |
bc0c38d1 SR |
27 | #include <linux/ctype.h> |
28 | #include <linux/init.h> | |
2a2cc8f7 | 29 | #include <linux/poll.h> |
bc0c38d1 SR |
30 | #include <linux/gfp.h> |
31 | #include <linux/fs.h> | |
76094a2c | 32 | #include <linux/kprobes.h> |
3eefae99 | 33 | #include <linux/writeback.h> |
bc0c38d1 | 34 | |
86387f7e | 35 | #include <linux/stacktrace.h> |
3928a8a2 | 36 | #include <linux/ring_buffer.h> |
86387f7e | 37 | |
bc0c38d1 SR |
38 | #include "trace.h" |
39 | ||
3928a8a2 SR |
40 | #define TRACE_BUFFER_FLAGS (RB_FL_OVERWRITE) |
41 | ||
bc0c38d1 SR |
42 | unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX; |
43 | unsigned long __read_mostly tracing_thresh; | |
44 | ||
d769041f SR |
45 | static DEFINE_PER_CPU(local_t, ftrace_cpu_disabled); |
46 | ||
47 | static inline void ftrace_disable_cpu(void) | |
48 | { | |
49 | preempt_disable(); | |
50 | local_inc(&__get_cpu_var(ftrace_cpu_disabled)); | |
51 | } | |
52 | ||
53 | static inline void ftrace_enable_cpu(void) | |
54 | { | |
55 | local_dec(&__get_cpu_var(ftrace_cpu_disabled)); | |
56 | preempt_enable(); | |
57 | } | |
58 | ||
ab46428c SR |
59 | static cpumask_t __read_mostly tracing_buffer_mask; |
60 | ||
61 | #define for_each_tracing_cpu(cpu) \ | |
62 | for_each_cpu_mask(cpu, tracing_buffer_mask) | |
63 | ||
60a11774 SR |
64 | static int tracing_disabled = 1; |
65 | ||
72829bc3 | 66 | long |
bc0c38d1 SR |
67 | ns2usecs(cycle_t nsec) |
68 | { | |
69 | nsec += 500; | |
70 | do_div(nsec, 1000); | |
71 | return nsec; | |
72 | } | |
73 | ||
e309b41d | 74 | cycle_t ftrace_now(int cpu) |
750ed1a4 | 75 | { |
3928a8a2 SR |
76 | u64 ts = ring_buffer_time_stamp(cpu); |
77 | ring_buffer_normalize_time_stamp(cpu, &ts); | |
78 | return ts; | |
750ed1a4 IM |
79 | } |
80 | ||
4fcdae83 SR |
81 | /* |
82 | * The global_trace is the descriptor that holds the tracing | |
83 | * buffers for the live tracing. For each CPU, it contains | |
84 | * a link list of pages that will store trace entries. The | |
85 | * page descriptor of the pages in the memory is used to hold | |
86 | * the link list by linking the lru item in the page descriptor | |
87 | * to each of the pages in the buffer per CPU. | |
88 | * | |
89 | * For each active CPU there is a data field that holds the | |
90 | * pages for the buffer for that CPU. Each CPU has the same number | |
91 | * of pages allocated for its buffer. | |
92 | */ | |
bc0c38d1 SR |
93 | static struct trace_array global_trace; |
94 | ||
95 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); | |
96 | ||
4fcdae83 SR |
97 | /* |
98 | * The max_tr is used to snapshot the global_trace when a maximum | |
99 | * latency is reached. Some tracers will use this to store a maximum | |
100 | * trace while it continues examining live traces. | |
101 | * | |
102 | * The buffers for the max_tr are set up the same as the global_trace. | |
103 | * When a snapshot is taken, the link list of the max_tr is swapped | |
104 | * with the link list of the global_trace and the buffers are reset for | |
105 | * the global_trace so the tracing can continue. | |
106 | */ | |
bc0c38d1 SR |
107 | static struct trace_array max_tr; |
108 | ||
109 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); | |
110 | ||
4fcdae83 | 111 | /* tracer_enabled is used to toggle activation of a tracer */ |
26994ead | 112 | static int tracer_enabled = 1; |
4fcdae83 | 113 | |
60bc0800 SR |
114 | /* function tracing enabled */ |
115 | int ftrace_function_enabled; | |
116 | ||
4fcdae83 | 117 | /* |
3928a8a2 SR |
118 | * trace_buf_size is the size in bytes that is allocated |
119 | * for a buffer. Note, the number of bytes is always rounded | |
120 | * to page size. | |
3f5a54e3 SR |
121 | * |
122 | * This number is purposely set to a low number of 16384. | |
123 | * If the dump on oops happens, it will be much appreciated | |
124 | * to not have to wait for all that output. Anyway this can be | |
125 | * boot time and run time configurable. | |
4fcdae83 | 126 | */ |
3928a8a2 | 127 | #define TRACE_BUF_SIZE_DEFAULT 1441792UL /* 16384 * 88 (sizeof(entry)) */ |
3f5a54e3 | 128 | |
3928a8a2 | 129 | static unsigned long trace_buf_size = TRACE_BUF_SIZE_DEFAULT; |
bc0c38d1 | 130 | |
4fcdae83 | 131 | /* trace_types holds a link list of available tracers. */ |
bc0c38d1 | 132 | static struct tracer *trace_types __read_mostly; |
4fcdae83 SR |
133 | |
134 | /* current_trace points to the tracer that is currently active */ | |
bc0c38d1 | 135 | static struct tracer *current_trace __read_mostly; |
4fcdae83 SR |
136 | |
137 | /* | |
138 | * max_tracer_type_len is used to simplify the allocating of | |
139 | * buffers to read userspace tracer names. We keep track of | |
140 | * the longest tracer name registered. | |
141 | */ | |
bc0c38d1 SR |
142 | static int max_tracer_type_len; |
143 | ||
4fcdae83 SR |
144 | /* |
145 | * trace_types_lock is used to protect the trace_types list. | |
146 | * This lock is also used to keep user access serialized. | |
147 | * Accesses from userspace will grab this lock while userspace | |
148 | * activities happen inside the kernel. | |
149 | */ | |
bc0c38d1 | 150 | static DEFINE_MUTEX(trace_types_lock); |
4fcdae83 SR |
151 | |
152 | /* trace_wait is a waitqueue for tasks blocked on trace_poll */ | |
4e655519 IM |
153 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
154 | ||
4fcdae83 | 155 | /* trace_flags holds iter_ctrl options */ |
4e655519 IM |
156 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT; |
157 | ||
4fcdae83 SR |
158 | /** |
159 | * trace_wake_up - wake up tasks waiting for trace input | |
160 | * | |
161 | * Simply wakes up any task that is blocked on the trace_wait | |
162 | * queue. These is used with trace_poll for tasks polling the trace. | |
163 | */ | |
4e655519 IM |
164 | void trace_wake_up(void) |
165 | { | |
017730c1 IM |
166 | /* |
167 | * The runqueue_is_locked() can fail, but this is the best we | |
168 | * have for now: | |
169 | */ | |
170 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) | |
4e655519 IM |
171 | wake_up(&trace_wait); |
172 | } | |
bc0c38d1 | 173 | |
3928a8a2 | 174 | static int __init set_buf_size(char *str) |
bc0c38d1 | 175 | { |
3928a8a2 | 176 | unsigned long buf_size; |
c6caeeb1 SR |
177 | int ret; |
178 | ||
bc0c38d1 SR |
179 | if (!str) |
180 | return 0; | |
3928a8a2 | 181 | ret = strict_strtoul(str, 0, &buf_size); |
c6caeeb1 | 182 | /* nr_entries can not be zero */ |
3928a8a2 | 183 | if (ret < 0 || buf_size == 0) |
c6caeeb1 | 184 | return 0; |
3928a8a2 | 185 | trace_buf_size = buf_size; |
bc0c38d1 SR |
186 | return 1; |
187 | } | |
3928a8a2 | 188 | __setup("trace_buf_size=", set_buf_size); |
bc0c38d1 | 189 | |
57f50be1 SR |
190 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
191 | { | |
192 | return nsecs / 1000; | |
193 | } | |
194 | ||
4fcdae83 SR |
195 | /* |
196 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that | |
197 | * control the output of kernel symbols. | |
198 | */ | |
bc0c38d1 SR |
199 | #define TRACE_ITER_SYM_MASK \ |
200 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
201 | ||
4fcdae83 | 202 | /* These must match the bit postions in trace_iterator_flags */ |
bc0c38d1 SR |
203 | static const char *trace_options[] = { |
204 | "print-parent", | |
205 | "sym-offset", | |
206 | "sym-addr", | |
207 | "verbose", | |
f9896bf3 | 208 | "raw", |
5e3ca0ec | 209 | "hex", |
cb0f12aa | 210 | "bin", |
2a2cc8f7 | 211 | "block", |
86387f7e | 212 | "stacktrace", |
4ac3ba41 | 213 | "sched-tree", |
f09ce573 | 214 | "ftrace_printk", |
bc0c38d1 SR |
215 | NULL |
216 | }; | |
217 | ||
4fcdae83 SR |
218 | /* |
219 | * ftrace_max_lock is used to protect the swapping of buffers | |
220 | * when taking a max snapshot. The buffers themselves are | |
221 | * protected by per_cpu spinlocks. But the action of the swap | |
222 | * needs its own lock. | |
223 | * | |
224 | * This is defined as a raw_spinlock_t in order to help | |
225 | * with performance when lockdep debugging is enabled. | |
226 | */ | |
92205c23 SR |
227 | static raw_spinlock_t ftrace_max_lock = |
228 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; | |
bc0c38d1 SR |
229 | |
230 | /* | |
231 | * Copy the new maximum trace into the separate maximum-trace | |
232 | * structure. (this way the maximum trace is permanently saved, | |
233 | * for later retrieval via /debugfs/tracing/latency_trace) | |
234 | */ | |
e309b41d | 235 | static void |
bc0c38d1 SR |
236 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
237 | { | |
238 | struct trace_array_cpu *data = tr->data[cpu]; | |
239 | ||
240 | max_tr.cpu = cpu; | |
241 | max_tr.time_start = data->preempt_timestamp; | |
242 | ||
243 | data = max_tr.data[cpu]; | |
244 | data->saved_latency = tracing_max_latency; | |
245 | ||
246 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); | |
247 | data->pid = tsk->pid; | |
248 | data->uid = tsk->uid; | |
249 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; | |
250 | data->policy = tsk->policy; | |
251 | data->rt_priority = tsk->rt_priority; | |
252 | ||
253 | /* record this tasks comm */ | |
254 | tracing_record_cmdline(current); | |
255 | } | |
256 | ||
4fcdae83 SR |
257 | /** |
258 | * trace_seq_printf - sequence printing of trace information | |
259 | * @s: trace sequence descriptor | |
260 | * @fmt: printf format string | |
261 | * | |
262 | * The tracer may use either sequence operations or its own | |
263 | * copy to user routines. To simplify formating of a trace | |
264 | * trace_seq_printf is used to store strings into a special | |
265 | * buffer (@s). Then the output may be either used by | |
266 | * the sequencer or pulled into another buffer. | |
267 | */ | |
72829bc3 | 268 | int |
214023c3 SR |
269 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
270 | { | |
271 | int len = (PAGE_SIZE - 1) - s->len; | |
272 | va_list ap; | |
b3806b43 | 273 | int ret; |
214023c3 SR |
274 | |
275 | if (!len) | |
276 | return 0; | |
277 | ||
278 | va_start(ap, fmt); | |
b3806b43 | 279 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
214023c3 SR |
280 | va_end(ap); |
281 | ||
b3806b43 | 282 | /* If we can't write it all, don't bother writing anything */ |
72829bc3 | 283 | if (ret >= len) |
b3806b43 SR |
284 | return 0; |
285 | ||
286 | s->len += ret; | |
214023c3 SR |
287 | |
288 | return len; | |
289 | } | |
290 | ||
4fcdae83 SR |
291 | /** |
292 | * trace_seq_puts - trace sequence printing of simple string | |
293 | * @s: trace sequence descriptor | |
294 | * @str: simple string to record | |
295 | * | |
296 | * The tracer may use either the sequence operations or its own | |
297 | * copy to user routines. This function records a simple string | |
298 | * into a special buffer (@s) for later retrieval by a sequencer | |
299 | * or other mechanism. | |
300 | */ | |
e309b41d | 301 | static int |
214023c3 SR |
302 | trace_seq_puts(struct trace_seq *s, const char *str) |
303 | { | |
304 | int len = strlen(str); | |
305 | ||
306 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
b3806b43 | 307 | return 0; |
214023c3 SR |
308 | |
309 | memcpy(s->buffer + s->len, str, len); | |
310 | s->len += len; | |
311 | ||
312 | return len; | |
313 | } | |
314 | ||
e309b41d | 315 | static int |
214023c3 SR |
316 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
317 | { | |
318 | if (s->len >= (PAGE_SIZE - 1)) | |
319 | return 0; | |
320 | ||
321 | s->buffer[s->len++] = c; | |
322 | ||
323 | return 1; | |
324 | } | |
325 | ||
e309b41d | 326 | static int |
cb0f12aa IM |
327 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
328 | { | |
329 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
330 | return 0; | |
331 | ||
332 | memcpy(s->buffer + s->len, mem, len); | |
333 | s->len += len; | |
334 | ||
335 | return len; | |
336 | } | |
337 | ||
ad0a3b68 HH |
338 | #define MAX_MEMHEX_BYTES 8 |
339 | #define HEX_CHARS (MAX_MEMHEX_BYTES*2 + 1) | |
5e3ca0ec | 340 | |
e309b41d | 341 | static int |
5e3ca0ec IM |
342 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
343 | { | |
344 | unsigned char hex[HEX_CHARS]; | |
93dcc6ea | 345 | unsigned char *data = mem; |
5e3ca0ec IM |
346 | int i, j; |
347 | ||
5e3ca0ec IM |
348 | #ifdef __BIG_ENDIAN |
349 | for (i = 0, j = 0; i < len; i++) { | |
350 | #else | |
351 | for (i = len-1, j = 0; i >= 0; i--) { | |
352 | #endif | |
2fbc4749 HH |
353 | hex[j++] = hex_asc_hi(data[i]); |
354 | hex[j++] = hex_asc_lo(data[i]); | |
5e3ca0ec | 355 | } |
93dcc6ea | 356 | hex[j++] = ' '; |
5e3ca0ec IM |
357 | |
358 | return trace_seq_putmem(s, hex, j); | |
359 | } | |
360 | ||
e309b41d | 361 | static void |
214023c3 SR |
362 | trace_seq_reset(struct trace_seq *s) |
363 | { | |
364 | s->len = 0; | |
6c6c2796 PP |
365 | s->readpos = 0; |
366 | } | |
367 | ||
368 | ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) | |
369 | { | |
370 | int len; | |
371 | int ret; | |
372 | ||
373 | if (s->len <= s->readpos) | |
374 | return -EBUSY; | |
375 | ||
376 | len = s->len - s->readpos; | |
377 | if (cnt > len) | |
378 | cnt = len; | |
379 | ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); | |
380 | if (ret) | |
381 | return -EFAULT; | |
382 | ||
383 | s->readpos += len; | |
384 | return cnt; | |
214023c3 SR |
385 | } |
386 | ||
e309b41d | 387 | static void |
214023c3 SR |
388 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
389 | { | |
390 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; | |
391 | ||
392 | s->buffer[len] = 0; | |
393 | seq_puts(m, s->buffer); | |
394 | ||
395 | trace_seq_reset(s); | |
396 | } | |
397 | ||
4fcdae83 SR |
398 | /** |
399 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr | |
400 | * @tr: tracer | |
401 | * @tsk: the task with the latency | |
402 | * @cpu: The cpu that initiated the trace. | |
403 | * | |
404 | * Flip the buffers between the @tr and the max_tr and record information | |
405 | * about which task was the cause of this latency. | |
406 | */ | |
e309b41d | 407 | void |
bc0c38d1 SR |
408 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
409 | { | |
3928a8a2 | 410 | struct ring_buffer *buf = tr->buffer; |
bc0c38d1 | 411 | |
4c11d7ae | 412 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 413 | __raw_spin_lock(&ftrace_max_lock); |
3928a8a2 SR |
414 | |
415 | tr->buffer = max_tr.buffer; | |
416 | max_tr.buffer = buf; | |
417 | ||
d769041f | 418 | ftrace_disable_cpu(); |
3928a8a2 | 419 | ring_buffer_reset(tr->buffer); |
d769041f | 420 | ftrace_enable_cpu(); |
bc0c38d1 SR |
421 | |
422 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 423 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
424 | } |
425 | ||
426 | /** | |
427 | * update_max_tr_single - only copy one trace over, and reset the rest | |
428 | * @tr - tracer | |
429 | * @tsk - task with the latency | |
430 | * @cpu - the cpu of the buffer to copy. | |
4fcdae83 SR |
431 | * |
432 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. | |
bc0c38d1 | 433 | */ |
e309b41d | 434 | void |
bc0c38d1 SR |
435 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
436 | { | |
3928a8a2 | 437 | int ret; |
bc0c38d1 | 438 | |
4c11d7ae | 439 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 440 | __raw_spin_lock(&ftrace_max_lock); |
bc0c38d1 | 441 | |
d769041f SR |
442 | ftrace_disable_cpu(); |
443 | ||
3928a8a2 SR |
444 | ring_buffer_reset(max_tr.buffer); |
445 | ret = ring_buffer_swap_cpu(max_tr.buffer, tr->buffer, cpu); | |
446 | ||
d769041f SR |
447 | ftrace_enable_cpu(); |
448 | ||
3928a8a2 | 449 | WARN_ON_ONCE(ret); |
bc0c38d1 SR |
450 | |
451 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 452 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
453 | } |
454 | ||
4fcdae83 SR |
455 | /** |
456 | * register_tracer - register a tracer with the ftrace system. | |
457 | * @type - the plugin for the tracer | |
458 | * | |
459 | * Register a new plugin tracer. | |
460 | */ | |
bc0c38d1 SR |
461 | int register_tracer(struct tracer *type) |
462 | { | |
463 | struct tracer *t; | |
464 | int len; | |
465 | int ret = 0; | |
466 | ||
467 | if (!type->name) { | |
468 | pr_info("Tracer must have a name\n"); | |
469 | return -1; | |
470 | } | |
471 | ||
472 | mutex_lock(&trace_types_lock); | |
473 | for (t = trace_types; t; t = t->next) { | |
474 | if (strcmp(type->name, t->name) == 0) { | |
475 | /* already found */ | |
476 | pr_info("Trace %s already registered\n", | |
477 | type->name); | |
478 | ret = -1; | |
479 | goto out; | |
480 | } | |
481 | } | |
482 | ||
60a11774 SR |
483 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
484 | if (type->selftest) { | |
485 | struct tracer *saved_tracer = current_trace; | |
60a11774 SR |
486 | struct trace_array *tr = &global_trace; |
487 | int saved_ctrl = tr->ctrl; | |
488 | int i; | |
489 | /* | |
490 | * Run a selftest on this tracer. | |
491 | * Here we reset the trace buffer, and set the current | |
492 | * tracer to be this tracer. The tracer can then run some | |
493 | * internal tracing to verify that everything is in order. | |
494 | * If we fail, we do not register this tracer. | |
495 | */ | |
ab46428c | 496 | for_each_tracing_cpu(i) { |
3928a8a2 | 497 | tracing_reset(tr, i); |
60a11774 SR |
498 | } |
499 | current_trace = type; | |
500 | tr->ctrl = 0; | |
501 | /* the test is responsible for initializing and enabling */ | |
502 | pr_info("Testing tracer %s: ", type->name); | |
503 | ret = type->selftest(type, tr); | |
504 | /* the test is responsible for resetting too */ | |
505 | current_trace = saved_tracer; | |
506 | tr->ctrl = saved_ctrl; | |
507 | if (ret) { | |
508 | printk(KERN_CONT "FAILED!\n"); | |
509 | goto out; | |
510 | } | |
1d4db00a | 511 | /* Only reset on passing, to avoid touching corrupted buffers */ |
ab46428c | 512 | for_each_tracing_cpu(i) { |
3928a8a2 | 513 | tracing_reset(tr, i); |
1d4db00a | 514 | } |
60a11774 SR |
515 | printk(KERN_CONT "PASSED\n"); |
516 | } | |
517 | #endif | |
518 | ||
bc0c38d1 SR |
519 | type->next = trace_types; |
520 | trace_types = type; | |
521 | len = strlen(type->name); | |
522 | if (len > max_tracer_type_len) | |
523 | max_tracer_type_len = len; | |
60a11774 | 524 | |
bc0c38d1 SR |
525 | out: |
526 | mutex_unlock(&trace_types_lock); | |
527 | ||
528 | return ret; | |
529 | } | |
530 | ||
531 | void unregister_tracer(struct tracer *type) | |
532 | { | |
533 | struct tracer **t; | |
534 | int len; | |
535 | ||
536 | mutex_lock(&trace_types_lock); | |
537 | for (t = &trace_types; *t; t = &(*t)->next) { | |
538 | if (*t == type) | |
539 | goto found; | |
540 | } | |
541 | pr_info("Trace %s not registered\n", type->name); | |
542 | goto out; | |
543 | ||
544 | found: | |
545 | *t = (*t)->next; | |
546 | if (strlen(type->name) != max_tracer_type_len) | |
547 | goto out; | |
548 | ||
549 | max_tracer_type_len = 0; | |
550 | for (t = &trace_types; *t; t = &(*t)->next) { | |
551 | len = strlen((*t)->name); | |
552 | if (len > max_tracer_type_len) | |
553 | max_tracer_type_len = len; | |
554 | } | |
555 | out: | |
556 | mutex_unlock(&trace_types_lock); | |
557 | } | |
558 | ||
3928a8a2 | 559 | void tracing_reset(struct trace_array *tr, int cpu) |
bc0c38d1 | 560 | { |
d769041f | 561 | ftrace_disable_cpu(); |
3928a8a2 | 562 | ring_buffer_reset_cpu(tr->buffer, cpu); |
d769041f | 563 | ftrace_enable_cpu(); |
bc0c38d1 SR |
564 | } |
565 | ||
bc0c38d1 SR |
566 | #define SAVED_CMDLINES 128 |
567 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; | |
568 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; | |
569 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; | |
570 | static int cmdline_idx; | |
571 | static DEFINE_SPINLOCK(trace_cmdline_lock); | |
25b0b44a | 572 | |
25b0b44a SR |
573 | /* temporary disable recording */ |
574 | atomic_t trace_record_cmdline_disabled __read_mostly; | |
bc0c38d1 SR |
575 | |
576 | static void trace_init_cmdlines(void) | |
577 | { | |
578 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); | |
579 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); | |
580 | cmdline_idx = 0; | |
581 | } | |
582 | ||
e309b41d | 583 | void trace_stop_cmdline_recording(void); |
bc0c38d1 | 584 | |
e309b41d | 585 | static void trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
586 | { |
587 | unsigned map; | |
588 | unsigned idx; | |
589 | ||
590 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
591 | return; | |
592 | ||
593 | /* | |
594 | * It's not the end of the world if we don't get | |
595 | * the lock, but we also don't want to spin | |
596 | * nor do we want to disable interrupts, | |
597 | * so if we miss here, then better luck next time. | |
598 | */ | |
599 | if (!spin_trylock(&trace_cmdline_lock)) | |
600 | return; | |
601 | ||
602 | idx = map_pid_to_cmdline[tsk->pid]; | |
603 | if (idx >= SAVED_CMDLINES) { | |
604 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; | |
605 | ||
606 | map = map_cmdline_to_pid[idx]; | |
607 | if (map <= PID_MAX_DEFAULT) | |
608 | map_pid_to_cmdline[map] = (unsigned)-1; | |
609 | ||
610 | map_pid_to_cmdline[tsk->pid] = idx; | |
611 | ||
612 | cmdline_idx = idx; | |
613 | } | |
614 | ||
615 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); | |
616 | ||
617 | spin_unlock(&trace_cmdline_lock); | |
618 | } | |
619 | ||
e309b41d | 620 | static char *trace_find_cmdline(int pid) |
bc0c38d1 SR |
621 | { |
622 | char *cmdline = "<...>"; | |
623 | unsigned map; | |
624 | ||
625 | if (!pid) | |
626 | return "<idle>"; | |
627 | ||
628 | if (pid > PID_MAX_DEFAULT) | |
629 | goto out; | |
630 | ||
631 | map = map_pid_to_cmdline[pid]; | |
632 | if (map >= SAVED_CMDLINES) | |
633 | goto out; | |
634 | ||
635 | cmdline = saved_cmdlines[map]; | |
636 | ||
637 | out: | |
638 | return cmdline; | |
639 | } | |
640 | ||
e309b41d | 641 | void tracing_record_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
642 | { |
643 | if (atomic_read(&trace_record_cmdline_disabled)) | |
644 | return; | |
645 | ||
646 | trace_save_cmdline(tsk); | |
647 | } | |
648 | ||
45dcd8b8 | 649 | void |
38697053 SR |
650 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags, |
651 | int pc) | |
bc0c38d1 SR |
652 | { |
653 | struct task_struct *tsk = current; | |
bc0c38d1 | 654 | |
777e208d SR |
655 | entry->preempt_count = pc & 0xff; |
656 | entry->pid = (tsk) ? tsk->pid : 0; | |
657 | entry->flags = | |
2e2ca155 | 658 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
bc0c38d1 SR |
659 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
660 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | | |
661 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); | |
662 | } | |
663 | ||
e309b41d | 664 | void |
6fb44b71 | 665 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
38697053 SR |
666 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
667 | int pc) | |
bc0c38d1 | 668 | { |
3928a8a2 | 669 | struct ring_buffer_event *event; |
777e208d | 670 | struct ftrace_entry *entry; |
dcb6308f | 671 | unsigned long irq_flags; |
bc0c38d1 | 672 | |
d769041f SR |
673 | /* If we are reading the ring buffer, don't trace */ |
674 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) | |
675 | return; | |
676 | ||
3928a8a2 SR |
677 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
678 | &irq_flags); | |
679 | if (!event) | |
680 | return; | |
681 | entry = ring_buffer_event_data(event); | |
38697053 | 682 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
683 | entry->ent.type = TRACE_FN; |
684 | entry->ip = ip; | |
685 | entry->parent_ip = parent_ip; | |
3928a8a2 | 686 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
bc0c38d1 SR |
687 | } |
688 | ||
e309b41d | 689 | void |
2e0f5761 | 690 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
38697053 SR |
691 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
692 | int pc) | |
2e0f5761 IM |
693 | { |
694 | if (likely(!atomic_read(&data->disabled))) | |
38697053 | 695 | trace_function(tr, data, ip, parent_ip, flags, pc); |
2e0f5761 IM |
696 | } |
697 | ||
38697053 SR |
698 | static void ftrace_trace_stack(struct trace_array *tr, |
699 | struct trace_array_cpu *data, | |
700 | unsigned long flags, | |
701 | int skip, int pc) | |
86387f7e | 702 | { |
3928a8a2 | 703 | struct ring_buffer_event *event; |
777e208d | 704 | struct stack_entry *entry; |
86387f7e | 705 | struct stack_trace trace; |
3928a8a2 | 706 | unsigned long irq_flags; |
86387f7e IM |
707 | |
708 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) | |
709 | return; | |
710 | ||
3928a8a2 SR |
711 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
712 | &irq_flags); | |
713 | if (!event) | |
714 | return; | |
715 | entry = ring_buffer_event_data(event); | |
38697053 | 716 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d | 717 | entry->ent.type = TRACE_STACK; |
86387f7e | 718 | |
777e208d | 719 | memset(&entry->caller, 0, sizeof(entry->caller)); |
86387f7e IM |
720 | |
721 | trace.nr_entries = 0; | |
722 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
723 | trace.skip = skip; | |
777e208d | 724 | trace.entries = entry->caller; |
86387f7e IM |
725 | |
726 | save_stack_trace(&trace); | |
3928a8a2 | 727 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
f0a920d5 IM |
728 | } |
729 | ||
38697053 SR |
730 | void __trace_stack(struct trace_array *tr, |
731 | struct trace_array_cpu *data, | |
732 | unsigned long flags, | |
733 | int skip) | |
734 | { | |
735 | ftrace_trace_stack(tr, data, flags, skip, preempt_count()); | |
736 | } | |
737 | ||
738 | static void | |
739 | ftrace_trace_special(void *__tr, void *__data, | |
740 | unsigned long arg1, unsigned long arg2, unsigned long arg3, | |
741 | int pc) | |
a4feb834 | 742 | { |
3928a8a2 | 743 | struct ring_buffer_event *event; |
a4feb834 IM |
744 | struct trace_array_cpu *data = __data; |
745 | struct trace_array *tr = __tr; | |
777e208d | 746 | struct special_entry *entry; |
a4feb834 IM |
747 | unsigned long irq_flags; |
748 | ||
3928a8a2 SR |
749 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
750 | &irq_flags); | |
751 | if (!event) | |
752 | return; | |
753 | entry = ring_buffer_event_data(event); | |
38697053 | 754 | tracing_generic_entry_update(&entry->ent, 0, pc); |
777e208d SR |
755 | entry->ent.type = TRACE_SPECIAL; |
756 | entry->arg1 = arg1; | |
757 | entry->arg2 = arg2; | |
758 | entry->arg3 = arg3; | |
3928a8a2 | 759 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 760 | ftrace_trace_stack(tr, data, irq_flags, 4, pc); |
a4feb834 IM |
761 | |
762 | trace_wake_up(); | |
763 | } | |
764 | ||
38697053 SR |
765 | void |
766 | __trace_special(void *__tr, void *__data, | |
767 | unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
768 | { | |
769 | ftrace_trace_special(__tr, __data, arg1, arg2, arg3, preempt_count()); | |
770 | } | |
771 | ||
e309b41d | 772 | void |
bc0c38d1 SR |
773 | tracing_sched_switch_trace(struct trace_array *tr, |
774 | struct trace_array_cpu *data, | |
86387f7e IM |
775 | struct task_struct *prev, |
776 | struct task_struct *next, | |
38697053 | 777 | unsigned long flags, int pc) |
bc0c38d1 | 778 | { |
3928a8a2 | 779 | struct ring_buffer_event *event; |
777e208d | 780 | struct ctx_switch_entry *entry; |
dcb6308f | 781 | unsigned long irq_flags; |
bc0c38d1 | 782 | |
3928a8a2 SR |
783 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
784 | &irq_flags); | |
785 | if (!event) | |
786 | return; | |
787 | entry = ring_buffer_event_data(event); | |
38697053 | 788 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
789 | entry->ent.type = TRACE_CTX; |
790 | entry->prev_pid = prev->pid; | |
791 | entry->prev_prio = prev->prio; | |
792 | entry->prev_state = prev->state; | |
793 | entry->next_pid = next->pid; | |
794 | entry->next_prio = next->prio; | |
795 | entry->next_state = next->state; | |
796 | entry->next_cpu = task_cpu(next); | |
3928a8a2 | 797 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 798 | ftrace_trace_stack(tr, data, flags, 5, pc); |
bc0c38d1 SR |
799 | } |
800 | ||
57422797 IM |
801 | void |
802 | tracing_sched_wakeup_trace(struct trace_array *tr, | |
803 | struct trace_array_cpu *data, | |
86387f7e IM |
804 | struct task_struct *wakee, |
805 | struct task_struct *curr, | |
38697053 | 806 | unsigned long flags, int pc) |
57422797 | 807 | { |
3928a8a2 | 808 | struct ring_buffer_event *event; |
777e208d | 809 | struct ctx_switch_entry *entry; |
57422797 IM |
810 | unsigned long irq_flags; |
811 | ||
3928a8a2 SR |
812 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
813 | &irq_flags); | |
814 | if (!event) | |
815 | return; | |
816 | entry = ring_buffer_event_data(event); | |
38697053 | 817 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
818 | entry->ent.type = TRACE_WAKE; |
819 | entry->prev_pid = curr->pid; | |
820 | entry->prev_prio = curr->prio; | |
821 | entry->prev_state = curr->state; | |
822 | entry->next_pid = wakee->pid; | |
823 | entry->next_prio = wakee->prio; | |
824 | entry->next_state = wakee->state; | |
825 | entry->next_cpu = task_cpu(wakee); | |
3928a8a2 | 826 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 827 | ftrace_trace_stack(tr, data, flags, 6, pc); |
017730c1 IM |
828 | |
829 | trace_wake_up(); | |
57422797 IM |
830 | } |
831 | ||
4902f884 SR |
832 | void |
833 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
834 | { | |
835 | struct trace_array *tr = &global_trace; | |
836 | struct trace_array_cpu *data; | |
4902f884 | 837 | int cpu; |
38697053 | 838 | int pc; |
4902f884 | 839 | |
43a15386 | 840 | if (tracing_disabled || !tr->ctrl) |
4902f884 SR |
841 | return; |
842 | ||
38697053 SR |
843 | pc = preempt_count(); |
844 | preempt_disable_notrace(); | |
4902f884 SR |
845 | cpu = raw_smp_processor_id(); |
846 | data = tr->data[cpu]; | |
4902f884 | 847 | |
3ea2e6d7 | 848 | if (likely(!atomic_read(&data->disabled))) |
38697053 | 849 | ftrace_trace_special(tr, data, arg1, arg2, arg3, pc); |
4902f884 | 850 | |
38697053 | 851 | preempt_enable_notrace(); |
4902f884 SR |
852 | } |
853 | ||
2e0f5761 | 854 | #ifdef CONFIG_FTRACE |
e309b41d | 855 | static void |
2e0f5761 IM |
856 | function_trace_call(unsigned long ip, unsigned long parent_ip) |
857 | { | |
858 | struct trace_array *tr = &global_trace; | |
859 | struct trace_array_cpu *data; | |
860 | unsigned long flags; | |
861 | long disabled; | |
38697053 SR |
862 | int cpu, resched; |
863 | int pc; | |
2e0f5761 | 864 | |
60bc0800 | 865 | if (unlikely(!ftrace_function_enabled)) |
2e0f5761 IM |
866 | return; |
867 | ||
ecea656d AS |
868 | if (skip_trace(ip)) |
869 | return; | |
870 | ||
38697053 SR |
871 | pc = preempt_count(); |
872 | resched = need_resched(); | |
873 | preempt_disable_notrace(); | |
874 | local_save_flags(flags); | |
2e0f5761 IM |
875 | cpu = raw_smp_processor_id(); |
876 | data = tr->data[cpu]; | |
877 | disabled = atomic_inc_return(&data->disabled); | |
878 | ||
879 | if (likely(disabled == 1)) | |
38697053 | 880 | trace_function(tr, data, ip, parent_ip, flags, pc); |
2e0f5761 IM |
881 | |
882 | atomic_dec(&data->disabled); | |
38697053 SR |
883 | if (resched) |
884 | preempt_enable_no_resched_notrace(); | |
885 | else | |
886 | preempt_enable_notrace(); | |
2e0f5761 IM |
887 | } |
888 | ||
889 | static struct ftrace_ops trace_ops __read_mostly = | |
890 | { | |
891 | .func = function_trace_call, | |
892 | }; | |
893 | ||
e309b41d | 894 | void tracing_start_function_trace(void) |
2e0f5761 | 895 | { |
60bc0800 | 896 | ftrace_function_enabled = 0; |
2e0f5761 | 897 | register_ftrace_function(&trace_ops); |
60bc0800 SR |
898 | if (tracer_enabled) |
899 | ftrace_function_enabled = 1; | |
2e0f5761 IM |
900 | } |
901 | ||
e309b41d | 902 | void tracing_stop_function_trace(void) |
2e0f5761 | 903 | { |
60bc0800 | 904 | ftrace_function_enabled = 0; |
2e0f5761 IM |
905 | unregister_ftrace_function(&trace_ops); |
906 | } | |
907 | #endif | |
908 | ||
bc0c38d1 SR |
909 | enum trace_file_type { |
910 | TRACE_FILE_LAT_FMT = 1, | |
911 | }; | |
912 | ||
5a90f577 SR |
913 | static void trace_iterator_increment(struct trace_iterator *iter, int cpu) |
914 | { | |
d769041f SR |
915 | /* Don't allow ftrace to trace into the ring buffers */ |
916 | ftrace_disable_cpu(); | |
917 | ||
5a90f577 | 918 | iter->idx++; |
d769041f SR |
919 | if (iter->buffer_iter[iter->cpu]) |
920 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); | |
921 | ||
922 | ftrace_enable_cpu(); | |
5a90f577 SR |
923 | } |
924 | ||
e309b41d | 925 | static struct trace_entry * |
3928a8a2 | 926 | peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts) |
dd0e545f | 927 | { |
3928a8a2 SR |
928 | struct ring_buffer_event *event; |
929 | struct ring_buffer_iter *buf_iter = iter->buffer_iter[cpu]; | |
dd0e545f | 930 | |
d769041f SR |
931 | /* Don't allow ftrace to trace into the ring buffers */ |
932 | ftrace_disable_cpu(); | |
933 | ||
934 | if (buf_iter) | |
935 | event = ring_buffer_iter_peek(buf_iter, ts); | |
936 | else | |
937 | event = ring_buffer_peek(iter->tr->buffer, cpu, ts); | |
938 | ||
939 | ftrace_enable_cpu(); | |
940 | ||
3928a8a2 | 941 | return event ? ring_buffer_event_data(event) : NULL; |
dd0e545f | 942 | } |
d769041f | 943 | |
dd0e545f | 944 | static struct trace_entry * |
3928a8a2 | 945 | __find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
bc0c38d1 | 946 | { |
3928a8a2 | 947 | struct ring_buffer *buffer = iter->tr->buffer; |
bc0c38d1 | 948 | struct trace_entry *ent, *next = NULL; |
3928a8a2 | 949 | u64 next_ts = 0, ts; |
bc0c38d1 SR |
950 | int next_cpu = -1; |
951 | int cpu; | |
952 | ||
ab46428c | 953 | for_each_tracing_cpu(cpu) { |
dd0e545f | 954 | |
3928a8a2 SR |
955 | if (ring_buffer_empty_cpu(buffer, cpu)) |
956 | continue; | |
dd0e545f | 957 | |
3928a8a2 | 958 | ent = peek_next_entry(iter, cpu, &ts); |
dd0e545f | 959 | |
cdd31cd2 IM |
960 | /* |
961 | * Pick the entry with the smallest timestamp: | |
962 | */ | |
3928a8a2 | 963 | if (ent && (!next || ts < next_ts)) { |
bc0c38d1 SR |
964 | next = ent; |
965 | next_cpu = cpu; | |
3928a8a2 | 966 | next_ts = ts; |
bc0c38d1 SR |
967 | } |
968 | } | |
969 | ||
970 | if (ent_cpu) | |
971 | *ent_cpu = next_cpu; | |
972 | ||
3928a8a2 SR |
973 | if (ent_ts) |
974 | *ent_ts = next_ts; | |
975 | ||
bc0c38d1 SR |
976 | return next; |
977 | } | |
978 | ||
dd0e545f SR |
979 | /* Find the next real entry, without updating the iterator itself */ |
980 | static struct trace_entry * | |
3928a8a2 | 981 | find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
bc0c38d1 | 982 | { |
3928a8a2 | 983 | return __find_next_entry(iter, ent_cpu, ent_ts); |
dd0e545f SR |
984 | } |
985 | ||
986 | /* Find the next real entry, and increment the iterator to the next entry */ | |
987 | static void *find_next_entry_inc(struct trace_iterator *iter) | |
988 | { | |
3928a8a2 | 989 | iter->ent = __find_next_entry(iter, &iter->cpu, &iter->ts); |
dd0e545f | 990 | |
3928a8a2 | 991 | if (iter->ent) |
dd0e545f SR |
992 | trace_iterator_increment(iter, iter->cpu); |
993 | ||
3928a8a2 | 994 | return iter->ent ? iter : NULL; |
b3806b43 | 995 | } |
bc0c38d1 | 996 | |
e309b41d | 997 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 | 998 | { |
d769041f SR |
999 | /* Don't allow ftrace to trace into the ring buffers */ |
1000 | ftrace_disable_cpu(); | |
3928a8a2 | 1001 | ring_buffer_consume(iter->tr->buffer, iter->cpu, &iter->ts); |
d769041f | 1002 | ftrace_enable_cpu(); |
bc0c38d1 SR |
1003 | } |
1004 | ||
e309b41d | 1005 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
1006 | { |
1007 | struct trace_iterator *iter = m->private; | |
bc0c38d1 | 1008 | int i = (int)*pos; |
4e3c3333 | 1009 | void *ent; |
bc0c38d1 SR |
1010 | |
1011 | (*pos)++; | |
1012 | ||
1013 | /* can't go backwards */ | |
1014 | if (iter->idx > i) | |
1015 | return NULL; | |
1016 | ||
1017 | if (iter->idx < 0) | |
1018 | ent = find_next_entry_inc(iter); | |
1019 | else | |
1020 | ent = iter; | |
1021 | ||
1022 | while (ent && iter->idx < i) | |
1023 | ent = find_next_entry_inc(iter); | |
1024 | ||
1025 | iter->pos = *pos; | |
1026 | ||
bc0c38d1 SR |
1027 | return ent; |
1028 | } | |
1029 | ||
1030 | static void *s_start(struct seq_file *m, loff_t *pos) | |
1031 | { | |
1032 | struct trace_iterator *iter = m->private; | |
1033 | void *p = NULL; | |
1034 | loff_t l = 0; | |
3928a8a2 | 1035 | int cpu; |
bc0c38d1 SR |
1036 | |
1037 | mutex_lock(&trace_types_lock); | |
1038 | ||
d15f57f2 SR |
1039 | if (!current_trace || current_trace != iter->trace) { |
1040 | mutex_unlock(&trace_types_lock); | |
bc0c38d1 | 1041 | return NULL; |
d15f57f2 | 1042 | } |
bc0c38d1 SR |
1043 | |
1044 | atomic_inc(&trace_record_cmdline_disabled); | |
1045 | ||
1046 | /* let the tracer grab locks here if needed */ | |
1047 | if (current_trace->start) | |
1048 | current_trace->start(iter); | |
1049 | ||
1050 | if (*pos != iter->pos) { | |
1051 | iter->ent = NULL; | |
1052 | iter->cpu = 0; | |
1053 | iter->idx = -1; | |
1054 | ||
d769041f SR |
1055 | ftrace_disable_cpu(); |
1056 | ||
3928a8a2 SR |
1057 | for_each_tracing_cpu(cpu) { |
1058 | ring_buffer_iter_reset(iter->buffer_iter[cpu]); | |
4c11d7ae | 1059 | } |
bc0c38d1 | 1060 | |
d769041f SR |
1061 | ftrace_enable_cpu(); |
1062 | ||
bc0c38d1 SR |
1063 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
1064 | ; | |
1065 | ||
1066 | } else { | |
4c11d7ae | 1067 | l = *pos - 1; |
bc0c38d1 SR |
1068 | p = s_next(m, p, &l); |
1069 | } | |
1070 | ||
1071 | return p; | |
1072 | } | |
1073 | ||
1074 | static void s_stop(struct seq_file *m, void *p) | |
1075 | { | |
1076 | struct trace_iterator *iter = m->private; | |
1077 | ||
1078 | atomic_dec(&trace_record_cmdline_disabled); | |
1079 | ||
1080 | /* let the tracer release locks here if needed */ | |
1081 | if (current_trace && current_trace == iter->trace && iter->trace->stop) | |
1082 | iter->trace->stop(iter); | |
1083 | ||
1084 | mutex_unlock(&trace_types_lock); | |
1085 | } | |
1086 | ||
76094a2c AS |
1087 | #define KRETPROBE_MSG "[unknown/kretprobe'd]" |
1088 | ||
1089 | #ifdef CONFIG_KRETPROBES | |
1090 | static inline int kretprobed(unsigned long addr) | |
1091 | { | |
1092 | return addr == (unsigned long)kretprobe_trampoline; | |
1093 | } | |
1094 | #else | |
1095 | static inline int kretprobed(unsigned long addr) | |
1096 | { | |
1097 | return 0; | |
1098 | } | |
1099 | #endif /* CONFIG_KRETPROBES */ | |
1100 | ||
b3806b43 | 1101 | static int |
214023c3 | 1102 | seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) |
bc0c38d1 SR |
1103 | { |
1104 | #ifdef CONFIG_KALLSYMS | |
1105 | char str[KSYM_SYMBOL_LEN]; | |
1106 | ||
1107 | kallsyms_lookup(address, NULL, NULL, NULL, str); | |
1108 | ||
b3806b43 | 1109 | return trace_seq_printf(s, fmt, str); |
bc0c38d1 | 1110 | #endif |
b3806b43 | 1111 | return 1; |
bc0c38d1 SR |
1112 | } |
1113 | ||
b3806b43 | 1114 | static int |
214023c3 SR |
1115 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
1116 | unsigned long address) | |
bc0c38d1 SR |
1117 | { |
1118 | #ifdef CONFIG_KALLSYMS | |
1119 | char str[KSYM_SYMBOL_LEN]; | |
1120 | ||
1121 | sprint_symbol(str, address); | |
b3806b43 | 1122 | return trace_seq_printf(s, fmt, str); |
bc0c38d1 | 1123 | #endif |
b3806b43 | 1124 | return 1; |
bc0c38d1 SR |
1125 | } |
1126 | ||
1127 | #ifndef CONFIG_64BIT | |
1128 | # define IP_FMT "%08lx" | |
1129 | #else | |
1130 | # define IP_FMT "%016lx" | |
1131 | #endif | |
1132 | ||
e309b41d | 1133 | static int |
214023c3 | 1134 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) |
bc0c38d1 | 1135 | { |
b3806b43 SR |
1136 | int ret; |
1137 | ||
1138 | if (!ip) | |
1139 | return trace_seq_printf(s, "0"); | |
bc0c38d1 SR |
1140 | |
1141 | if (sym_flags & TRACE_ITER_SYM_OFFSET) | |
b3806b43 | 1142 | ret = seq_print_sym_offset(s, "%s", ip); |
bc0c38d1 | 1143 | else |
b3806b43 SR |
1144 | ret = seq_print_sym_short(s, "%s", ip); |
1145 | ||
1146 | if (!ret) | |
1147 | return 0; | |
bc0c38d1 SR |
1148 | |
1149 | if (sym_flags & TRACE_ITER_SYM_ADDR) | |
b3806b43 SR |
1150 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
1151 | return ret; | |
bc0c38d1 SR |
1152 | } |
1153 | ||
e309b41d | 1154 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 | 1155 | { |
a6168353 ME |
1156 | seq_puts(m, "# _------=> CPU# \n"); |
1157 | seq_puts(m, "# / _-----=> irqs-off \n"); | |
1158 | seq_puts(m, "# | / _----=> need-resched \n"); | |
1159 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); | |
1160 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); | |
1161 | seq_puts(m, "# |||| / \n"); | |
1162 | seq_puts(m, "# ||||| delay \n"); | |
1163 | seq_puts(m, "# cmd pid ||||| time | caller \n"); | |
1164 | seq_puts(m, "# \\ / ||||| \\ | / \n"); | |
bc0c38d1 SR |
1165 | } |
1166 | ||
e309b41d | 1167 | static void print_func_help_header(struct seq_file *m) |
bc0c38d1 | 1168 | { |
a6168353 ME |
1169 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
1170 | seq_puts(m, "# | | | | |\n"); | |
bc0c38d1 SR |
1171 | } |
1172 | ||
1173 | ||
e309b41d | 1174 | static void |
bc0c38d1 SR |
1175 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
1176 | { | |
1177 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); | |
1178 | struct trace_array *tr = iter->tr; | |
1179 | struct trace_array_cpu *data = tr->data[tr->cpu]; | |
1180 | struct tracer *type = current_trace; | |
3928a8a2 SR |
1181 | unsigned long total; |
1182 | unsigned long entries; | |
bc0c38d1 SR |
1183 | const char *name = "preemption"; |
1184 | ||
1185 | if (type) | |
1186 | name = type->name; | |
1187 | ||
3928a8a2 SR |
1188 | entries = ring_buffer_entries(iter->tr->buffer); |
1189 | total = entries + | |
1190 | ring_buffer_overruns(iter->tr->buffer); | |
bc0c38d1 SR |
1191 | |
1192 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", | |
1193 | name, UTS_RELEASE); | |
1194 | seq_puts(m, "-----------------------------------" | |
1195 | "---------------------------------\n"); | |
1196 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" | |
1197 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", | |
57f50be1 | 1198 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 1199 | entries, |
4c11d7ae | 1200 | total, |
bc0c38d1 SR |
1201 | tr->cpu, |
1202 | #if defined(CONFIG_PREEMPT_NONE) | |
1203 | "server", | |
1204 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
1205 | "desktop", | |
b5c21b45 | 1206 | #elif defined(CONFIG_PREEMPT) |
bc0c38d1 SR |
1207 | "preempt", |
1208 | #else | |
1209 | "unknown", | |
1210 | #endif | |
1211 | /* These are reserved for later use */ | |
1212 | 0, 0, 0, 0); | |
1213 | #ifdef CONFIG_SMP | |
1214 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
1215 | #else | |
1216 | seq_puts(m, ")\n"); | |
1217 | #endif | |
1218 | seq_puts(m, " -----------------\n"); | |
1219 | seq_printf(m, " | task: %.16s-%d " | |
1220 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", | |
1221 | data->comm, data->pid, data->uid, data->nice, | |
1222 | data->policy, data->rt_priority); | |
1223 | seq_puts(m, " -----------------\n"); | |
1224 | ||
1225 | if (data->critical_start) { | |
1226 | seq_puts(m, " => started at: "); | |
214023c3 SR |
1227 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
1228 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 | 1229 | seq_puts(m, "\n => ended at: "); |
214023c3 SR |
1230 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
1231 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 SR |
1232 | seq_puts(m, "\n"); |
1233 | } | |
1234 | ||
1235 | seq_puts(m, "\n"); | |
1236 | } | |
1237 | ||
e309b41d | 1238 | static void |
214023c3 | 1239 | lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) |
bc0c38d1 SR |
1240 | { |
1241 | int hardirq, softirq; | |
1242 | char *comm; | |
1243 | ||
777e208d | 1244 | comm = trace_find_cmdline(entry->pid); |
bc0c38d1 | 1245 | |
777e208d | 1246 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
a6168353 | 1247 | trace_seq_printf(s, "%3d", cpu); |
214023c3 | 1248 | trace_seq_printf(s, "%c%c", |
777e208d SR |
1249 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.', |
1250 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); | |
bc0c38d1 | 1251 | |
777e208d SR |
1252 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; |
1253 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; | |
afc2abc0 | 1254 | if (hardirq && softirq) { |
214023c3 | 1255 | trace_seq_putc(s, 'H'); |
afc2abc0 IM |
1256 | } else { |
1257 | if (hardirq) { | |
214023c3 | 1258 | trace_seq_putc(s, 'h'); |
afc2abc0 | 1259 | } else { |
bc0c38d1 | 1260 | if (softirq) |
214023c3 | 1261 | trace_seq_putc(s, 's'); |
bc0c38d1 | 1262 | else |
214023c3 | 1263 | trace_seq_putc(s, '.'); |
bc0c38d1 SR |
1264 | } |
1265 | } | |
1266 | ||
777e208d SR |
1267 | if (entry->preempt_count) |
1268 | trace_seq_printf(s, "%x", entry->preempt_count); | |
bc0c38d1 | 1269 | else |
214023c3 | 1270 | trace_seq_puts(s, "."); |
bc0c38d1 SR |
1271 | } |
1272 | ||
1273 | unsigned long preempt_mark_thresh = 100; | |
1274 | ||
e309b41d | 1275 | static void |
3928a8a2 | 1276 | lat_print_timestamp(struct trace_seq *s, u64 abs_usecs, |
bc0c38d1 SR |
1277 | unsigned long rel_usecs) |
1278 | { | |
214023c3 | 1279 | trace_seq_printf(s, " %4lldus", abs_usecs); |
bc0c38d1 | 1280 | if (rel_usecs > preempt_mark_thresh) |
214023c3 | 1281 | trace_seq_puts(s, "!: "); |
bc0c38d1 | 1282 | else if (rel_usecs > 1) |
214023c3 | 1283 | trace_seq_puts(s, "+: "); |
bc0c38d1 | 1284 | else |
214023c3 | 1285 | trace_seq_puts(s, " : "); |
bc0c38d1 SR |
1286 | } |
1287 | ||
1288 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; | |
1289 | ||
fc5e27ae PP |
1290 | /* |
1291 | * The message is supposed to contain an ending newline. | |
1292 | * If the printing stops prematurely, try to add a newline of our own. | |
1293 | */ | |
1294 | void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter) | |
dd0e545f | 1295 | { |
dd0e545f | 1296 | struct trace_entry *ent; |
777e208d | 1297 | struct trace_field_cont *cont; |
fc5e27ae | 1298 | bool ok = true; |
dd0e545f | 1299 | |
3928a8a2 | 1300 | ent = peek_next_entry(iter, iter->cpu, NULL); |
dd0e545f SR |
1301 | if (!ent || ent->type != TRACE_CONT) { |
1302 | trace_seq_putc(s, '\n'); | |
1303 | return; | |
1304 | } | |
1305 | ||
1306 | do { | |
777e208d | 1307 | cont = (struct trace_field_cont *)ent; |
fc5e27ae | 1308 | if (ok) |
777e208d | 1309 | ok = (trace_seq_printf(s, "%s", cont->buf) > 0); |
d769041f SR |
1310 | |
1311 | ftrace_disable_cpu(); | |
1312 | ||
1313 | if (iter->buffer_iter[iter->cpu]) | |
1314 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); | |
1315 | else | |
1316 | ring_buffer_consume(iter->tr->buffer, iter->cpu, NULL); | |
1317 | ||
1318 | ftrace_enable_cpu(); | |
1319 | ||
3928a8a2 | 1320 | ent = peek_next_entry(iter, iter->cpu, NULL); |
dd0e545f | 1321 | } while (ent && ent->type == TRACE_CONT); |
fc5e27ae PP |
1322 | |
1323 | if (!ok) | |
1324 | trace_seq_putc(s, '\n'); | |
dd0e545f SR |
1325 | } |
1326 | ||
2c4f035f | 1327 | static enum print_line_t |
214023c3 | 1328 | print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) |
bc0c38d1 | 1329 | { |
214023c3 | 1330 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1331 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
3928a8a2 | 1332 | struct trace_entry *next_entry; |
bc0c38d1 SR |
1333 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); |
1334 | struct trace_entry *entry = iter->ent; | |
1335 | unsigned long abs_usecs; | |
1336 | unsigned long rel_usecs; | |
3928a8a2 | 1337 | u64 next_ts; |
bc0c38d1 | 1338 | char *comm; |
bac524d3 | 1339 | int S, T; |
86387f7e | 1340 | int i; |
d17d9691 | 1341 | unsigned state; |
bc0c38d1 | 1342 | |
dd0e545f | 1343 | if (entry->type == TRACE_CONT) |
2c4f035f | 1344 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1345 | |
3928a8a2 SR |
1346 | next_entry = find_next_entry(iter, NULL, &next_ts); |
1347 | if (!next_entry) | |
1348 | next_ts = iter->ts; | |
1349 | rel_usecs = ns2usecs(next_ts - iter->ts); | |
1350 | abs_usecs = ns2usecs(iter->ts - iter->tr->time_start); | |
bc0c38d1 SR |
1351 | |
1352 | if (verbose) { | |
777e208d | 1353 | comm = trace_find_cmdline(entry->pid); |
a6168353 | 1354 | trace_seq_printf(s, "%16s %5d %3d %d %08x %08x [%08lx]" |
214023c3 SR |
1355 | " %ld.%03ldms (+%ld.%03ldms): ", |
1356 | comm, | |
777e208d SR |
1357 | entry->pid, cpu, entry->flags, |
1358 | entry->preempt_count, trace_idx, | |
3928a8a2 | 1359 | ns2usecs(iter->ts), |
214023c3 SR |
1360 | abs_usecs/1000, |
1361 | abs_usecs % 1000, rel_usecs/1000, | |
1362 | rel_usecs % 1000); | |
bc0c38d1 | 1363 | } else { |
f29c73fe IM |
1364 | lat_print_generic(s, entry, cpu); |
1365 | lat_print_timestamp(s, abs_usecs, rel_usecs); | |
bc0c38d1 SR |
1366 | } |
1367 | switch (entry->type) { | |
777e208d | 1368 | case TRACE_FN: { |
7104f300 SR |
1369 | struct ftrace_entry *field; |
1370 | ||
1371 | trace_assign_type(field, entry); | |
777e208d SR |
1372 | |
1373 | seq_print_ip_sym(s, field->ip, sym_flags); | |
214023c3 | 1374 | trace_seq_puts(s, " ("); |
777e208d | 1375 | if (kretprobed(field->parent_ip)) |
76094a2c AS |
1376 | trace_seq_puts(s, KRETPROBE_MSG); |
1377 | else | |
777e208d | 1378 | seq_print_ip_sym(s, field->parent_ip, sym_flags); |
214023c3 | 1379 | trace_seq_puts(s, ")\n"); |
bc0c38d1 | 1380 | break; |
777e208d | 1381 | } |
bc0c38d1 | 1382 | case TRACE_CTX: |
777e208d | 1383 | case TRACE_WAKE: { |
7104f300 SR |
1384 | struct ctx_switch_entry *field; |
1385 | ||
1386 | trace_assign_type(field, entry); | |
777e208d SR |
1387 | |
1388 | T = field->next_state < sizeof(state_to_char) ? | |
1389 | state_to_char[field->next_state] : 'X'; | |
bac524d3 | 1390 | |
777e208d SR |
1391 | state = field->prev_state ? |
1392 | __ffs(field->prev_state) + 1 : 0; | |
d17d9691 | 1393 | S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X'; |
777e208d | 1394 | comm = trace_find_cmdline(field->next_pid); |
80b5e940 | 1395 | trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n", |
777e208d SR |
1396 | field->prev_pid, |
1397 | field->prev_prio, | |
57422797 | 1398 | S, entry->type == TRACE_CTX ? "==>" : " +", |
777e208d SR |
1399 | field->next_cpu, |
1400 | field->next_pid, | |
1401 | field->next_prio, | |
bac524d3 | 1402 | T, comm); |
bc0c38d1 | 1403 | break; |
777e208d SR |
1404 | } |
1405 | case TRACE_SPECIAL: { | |
7104f300 SR |
1406 | struct special_entry *field; |
1407 | ||
1408 | trace_assign_type(field, entry); | |
777e208d | 1409 | |
88a4216c | 1410 | trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
1411 | field->arg1, |
1412 | field->arg2, | |
1413 | field->arg3); | |
f0a920d5 | 1414 | break; |
777e208d SR |
1415 | } |
1416 | case TRACE_STACK: { | |
7104f300 SR |
1417 | struct stack_entry *field; |
1418 | ||
1419 | trace_assign_type(field, entry); | |
777e208d | 1420 | |
86387f7e IM |
1421 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
1422 | if (i) | |
1423 | trace_seq_puts(s, " <= "); | |
777e208d | 1424 | seq_print_ip_sym(s, field->caller[i], sym_flags); |
86387f7e IM |
1425 | } |
1426 | trace_seq_puts(s, "\n"); | |
1427 | break; | |
777e208d SR |
1428 | } |
1429 | case TRACE_PRINT: { | |
7104f300 SR |
1430 | struct print_entry *field; |
1431 | ||
1432 | trace_assign_type(field, entry); | |
777e208d SR |
1433 | |
1434 | seq_print_ip_sym(s, field->ip, sym_flags); | |
1435 | trace_seq_printf(s, ": %s", field->buf); | |
1436 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
1437 | trace_seq_print_cont(s, iter); |
1438 | break; | |
777e208d | 1439 | } |
89b2f978 | 1440 | default: |
214023c3 | 1441 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
bc0c38d1 | 1442 | } |
2c4f035f | 1443 | return TRACE_TYPE_HANDLED; |
bc0c38d1 SR |
1444 | } |
1445 | ||
2c4f035f | 1446 | static enum print_line_t print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 1447 | { |
214023c3 | 1448 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1449 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 1450 | struct trace_entry *entry; |
bc0c38d1 SR |
1451 | unsigned long usec_rem; |
1452 | unsigned long long t; | |
1453 | unsigned long secs; | |
1454 | char *comm; | |
b3806b43 | 1455 | int ret; |
bac524d3 | 1456 | int S, T; |
86387f7e | 1457 | int i; |
bc0c38d1 | 1458 | |
4e3c3333 | 1459 | entry = iter->ent; |
dd0e545f SR |
1460 | |
1461 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1462 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1463 | |
777e208d | 1464 | comm = trace_find_cmdline(iter->ent->pid); |
bc0c38d1 | 1465 | |
3928a8a2 | 1466 | t = ns2usecs(iter->ts); |
bc0c38d1 SR |
1467 | usec_rem = do_div(t, 1000000ULL); |
1468 | secs = (unsigned long)t; | |
1469 | ||
777e208d | 1470 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
f29c73fe | 1471 | if (!ret) |
2c4f035f | 1472 | return TRACE_TYPE_PARTIAL_LINE; |
a6168353 | 1473 | ret = trace_seq_printf(s, "[%03d] ", iter->cpu); |
f29c73fe | 1474 | if (!ret) |
2c4f035f | 1475 | return TRACE_TYPE_PARTIAL_LINE; |
f29c73fe IM |
1476 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); |
1477 | if (!ret) | |
2c4f035f | 1478 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 SR |
1479 | |
1480 | switch (entry->type) { | |
777e208d | 1481 | case TRACE_FN: { |
7104f300 SR |
1482 | struct ftrace_entry *field; |
1483 | ||
1484 | trace_assign_type(field, entry); | |
777e208d SR |
1485 | |
1486 | ret = seq_print_ip_sym(s, field->ip, sym_flags); | |
b3806b43 | 1487 | if (!ret) |
2c4f035f | 1488 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1489 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
777e208d | 1490 | field->parent_ip) { |
b3806b43 SR |
1491 | ret = trace_seq_printf(s, " <-"); |
1492 | if (!ret) | |
2c4f035f | 1493 | return TRACE_TYPE_PARTIAL_LINE; |
777e208d | 1494 | if (kretprobed(field->parent_ip)) |
76094a2c AS |
1495 | ret = trace_seq_puts(s, KRETPROBE_MSG); |
1496 | else | |
2e2ca155 | 1497 | ret = seq_print_ip_sym(s, |
777e208d | 1498 | field->parent_ip, |
76094a2c | 1499 | sym_flags); |
b3806b43 | 1500 | if (!ret) |
2c4f035f | 1501 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1502 | } |
b3806b43 SR |
1503 | ret = trace_seq_printf(s, "\n"); |
1504 | if (!ret) | |
2c4f035f | 1505 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1506 | break; |
777e208d | 1507 | } |
bc0c38d1 | 1508 | case TRACE_CTX: |
777e208d | 1509 | case TRACE_WAKE: { |
7104f300 SR |
1510 | struct ctx_switch_entry *field; |
1511 | ||
1512 | trace_assign_type(field, entry); | |
777e208d SR |
1513 | |
1514 | S = field->prev_state < sizeof(state_to_char) ? | |
1515 | state_to_char[field->prev_state] : 'X'; | |
1516 | T = field->next_state < sizeof(state_to_char) ? | |
1517 | state_to_char[field->next_state] : 'X'; | |
80b5e940 | 1518 | ret = trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c\n", |
777e208d SR |
1519 | field->prev_pid, |
1520 | field->prev_prio, | |
b3806b43 | 1521 | S, |
57422797 | 1522 | entry->type == TRACE_CTX ? "==>" : " +", |
777e208d SR |
1523 | field->next_cpu, |
1524 | field->next_pid, | |
1525 | field->next_prio, | |
bac524d3 | 1526 | T); |
b3806b43 | 1527 | if (!ret) |
2c4f035f | 1528 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1529 | break; |
777e208d SR |
1530 | } |
1531 | case TRACE_SPECIAL: { | |
7104f300 SR |
1532 | struct special_entry *field; |
1533 | ||
1534 | trace_assign_type(field, entry); | |
777e208d | 1535 | |
88a4216c | 1536 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
1537 | field->arg1, |
1538 | field->arg2, | |
1539 | field->arg3); | |
f0a920d5 | 1540 | if (!ret) |
2c4f035f | 1541 | return TRACE_TYPE_PARTIAL_LINE; |
f0a920d5 | 1542 | break; |
777e208d SR |
1543 | } |
1544 | case TRACE_STACK: { | |
7104f300 SR |
1545 | struct stack_entry *field; |
1546 | ||
1547 | trace_assign_type(field, entry); | |
777e208d | 1548 | |
86387f7e IM |
1549 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
1550 | if (i) { | |
1551 | ret = trace_seq_puts(s, " <= "); | |
1552 | if (!ret) | |
2c4f035f | 1553 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e | 1554 | } |
777e208d | 1555 | ret = seq_print_ip_sym(s, field->caller[i], |
86387f7e IM |
1556 | sym_flags); |
1557 | if (!ret) | |
2c4f035f | 1558 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e IM |
1559 | } |
1560 | ret = trace_seq_puts(s, "\n"); | |
1561 | if (!ret) | |
2c4f035f | 1562 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e | 1563 | break; |
777e208d SR |
1564 | } |
1565 | case TRACE_PRINT: { | |
7104f300 SR |
1566 | struct print_entry *field; |
1567 | ||
1568 | trace_assign_type(field, entry); | |
777e208d SR |
1569 | |
1570 | seq_print_ip_sym(s, field->ip, sym_flags); | |
1571 | trace_seq_printf(s, ": %s", field->buf); | |
1572 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
1573 | trace_seq_print_cont(s, iter); |
1574 | break; | |
bc0c38d1 | 1575 | } |
777e208d | 1576 | } |
2c4f035f | 1577 | return TRACE_TYPE_HANDLED; |
bc0c38d1 SR |
1578 | } |
1579 | ||
2c4f035f | 1580 | static enum print_line_t print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 IM |
1581 | { |
1582 | struct trace_seq *s = &iter->seq; | |
1583 | struct trace_entry *entry; | |
1584 | int ret; | |
bac524d3 | 1585 | int S, T; |
f9896bf3 IM |
1586 | |
1587 | entry = iter->ent; | |
dd0e545f SR |
1588 | |
1589 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1590 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1591 | |
f9896bf3 | 1592 | ret = trace_seq_printf(s, "%d %d %llu ", |
777e208d | 1593 | entry->pid, iter->cpu, iter->ts); |
f9896bf3 | 1594 | if (!ret) |
2c4f035f | 1595 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 IM |
1596 | |
1597 | switch (entry->type) { | |
777e208d | 1598 | case TRACE_FN: { |
7104f300 SR |
1599 | struct ftrace_entry *field; |
1600 | ||
1601 | trace_assign_type(field, entry); | |
777e208d | 1602 | |
f9896bf3 | 1603 | ret = trace_seq_printf(s, "%x %x\n", |
777e208d SR |
1604 | field->ip, |
1605 | field->parent_ip); | |
f9896bf3 | 1606 | if (!ret) |
2c4f035f | 1607 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 | 1608 | break; |
777e208d | 1609 | } |
f9896bf3 | 1610 | case TRACE_CTX: |
777e208d | 1611 | case TRACE_WAKE: { |
7104f300 SR |
1612 | struct ctx_switch_entry *field; |
1613 | ||
1614 | trace_assign_type(field, entry); | |
777e208d SR |
1615 | |
1616 | S = field->prev_state < sizeof(state_to_char) ? | |
1617 | state_to_char[field->prev_state] : 'X'; | |
1618 | T = field->next_state < sizeof(state_to_char) ? | |
1619 | state_to_char[field->next_state] : 'X'; | |
57422797 IM |
1620 | if (entry->type == TRACE_WAKE) |
1621 | S = '+'; | |
80b5e940 | 1622 | ret = trace_seq_printf(s, "%d %d %c %d %d %d %c\n", |
777e208d SR |
1623 | field->prev_pid, |
1624 | field->prev_prio, | |
f9896bf3 | 1625 | S, |
777e208d SR |
1626 | field->next_cpu, |
1627 | field->next_pid, | |
1628 | field->next_prio, | |
bac524d3 | 1629 | T); |
f9896bf3 | 1630 | if (!ret) |
2c4f035f | 1631 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 | 1632 | break; |
777e208d | 1633 | } |
f0a920d5 | 1634 | case TRACE_SPECIAL: |
777e208d | 1635 | case TRACE_STACK: { |
7104f300 SR |
1636 | struct special_entry *field; |
1637 | ||
1638 | trace_assign_type(field, entry); | |
777e208d | 1639 | |
88a4216c | 1640 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
1641 | field->arg1, |
1642 | field->arg2, | |
1643 | field->arg3); | |
f0a920d5 | 1644 | if (!ret) |
2c4f035f | 1645 | return TRACE_TYPE_PARTIAL_LINE; |
f0a920d5 | 1646 | break; |
777e208d SR |
1647 | } |
1648 | case TRACE_PRINT: { | |
7104f300 SR |
1649 | struct print_entry *field; |
1650 | ||
1651 | trace_assign_type(field, entry); | |
777e208d SR |
1652 | |
1653 | trace_seq_printf(s, "# %lx %s", field->ip, field->buf); | |
1654 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
1655 | trace_seq_print_cont(s, iter); |
1656 | break; | |
f9896bf3 | 1657 | } |
777e208d | 1658 | } |
2c4f035f | 1659 | return TRACE_TYPE_HANDLED; |
f9896bf3 IM |
1660 | } |
1661 | ||
cb0f12aa IM |
1662 | #define SEQ_PUT_FIELD_RET(s, x) \ |
1663 | do { \ | |
1664 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ | |
1665 | return 0; \ | |
1666 | } while (0) | |
1667 | ||
5e3ca0ec IM |
1668 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
1669 | do { \ | |
ad0a3b68 | 1670 | BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES); \ |
5e3ca0ec IM |
1671 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ |
1672 | return 0; \ | |
1673 | } while (0) | |
1674 | ||
2c4f035f | 1675 | static enum print_line_t print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec IM |
1676 | { |
1677 | struct trace_seq *s = &iter->seq; | |
1678 | unsigned char newline = '\n'; | |
1679 | struct trace_entry *entry; | |
bac524d3 | 1680 | int S, T; |
5e3ca0ec IM |
1681 | |
1682 | entry = iter->ent; | |
dd0e545f SR |
1683 | |
1684 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1685 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1686 | |
777e208d | 1687 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); |
5e3ca0ec | 1688 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); |
3928a8a2 | 1689 | SEQ_PUT_HEX_FIELD_RET(s, iter->ts); |
5e3ca0ec IM |
1690 | |
1691 | switch (entry->type) { | |
777e208d | 1692 | case TRACE_FN: { |
7104f300 SR |
1693 | struct ftrace_entry *field; |
1694 | ||
1695 | trace_assign_type(field, entry); | |
777e208d SR |
1696 | |
1697 | SEQ_PUT_HEX_FIELD_RET(s, field->ip); | |
1698 | SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip); | |
5e3ca0ec | 1699 | break; |
777e208d | 1700 | } |
5e3ca0ec | 1701 | case TRACE_CTX: |
777e208d | 1702 | case TRACE_WAKE: { |
7104f300 SR |
1703 | struct ctx_switch_entry *field; |
1704 | ||
1705 | trace_assign_type(field, entry); | |
777e208d SR |
1706 | |
1707 | S = field->prev_state < sizeof(state_to_char) ? | |
1708 | state_to_char[field->prev_state] : 'X'; | |
1709 | T = field->next_state < sizeof(state_to_char) ? | |
1710 | state_to_char[field->next_state] : 'X'; | |
57422797 IM |
1711 | if (entry->type == TRACE_WAKE) |
1712 | S = '+'; | |
777e208d SR |
1713 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid); |
1714 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio); | |
5e3ca0ec | 1715 | SEQ_PUT_HEX_FIELD_RET(s, S); |
777e208d SR |
1716 | SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu); |
1717 | SEQ_PUT_HEX_FIELD_RET(s, field->next_pid); | |
1718 | SEQ_PUT_HEX_FIELD_RET(s, field->next_prio); | |
bac524d3 | 1719 | SEQ_PUT_HEX_FIELD_RET(s, T); |
5e3ca0ec | 1720 | break; |
777e208d | 1721 | } |
5e3ca0ec | 1722 | case TRACE_SPECIAL: |
777e208d | 1723 | case TRACE_STACK: { |
7104f300 SR |
1724 | struct special_entry *field; |
1725 | ||
1726 | trace_assign_type(field, entry); | |
777e208d SR |
1727 | |
1728 | SEQ_PUT_HEX_FIELD_RET(s, field->arg1); | |
1729 | SEQ_PUT_HEX_FIELD_RET(s, field->arg2); | |
1730 | SEQ_PUT_HEX_FIELD_RET(s, field->arg3); | |
5e3ca0ec IM |
1731 | break; |
1732 | } | |
777e208d | 1733 | } |
5e3ca0ec IM |
1734 | SEQ_PUT_FIELD_RET(s, newline); |
1735 | ||
2c4f035f | 1736 | return TRACE_TYPE_HANDLED; |
5e3ca0ec IM |
1737 | } |
1738 | ||
2c4f035f | 1739 | static enum print_line_t print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa IM |
1740 | { |
1741 | struct trace_seq *s = &iter->seq; | |
1742 | struct trace_entry *entry; | |
1743 | ||
1744 | entry = iter->ent; | |
dd0e545f SR |
1745 | |
1746 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1747 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1748 | |
777e208d SR |
1749 | SEQ_PUT_FIELD_RET(s, entry->pid); |
1750 | SEQ_PUT_FIELD_RET(s, iter->cpu); | |
3928a8a2 | 1751 | SEQ_PUT_FIELD_RET(s, iter->ts); |
cb0f12aa IM |
1752 | |
1753 | switch (entry->type) { | |
777e208d | 1754 | case TRACE_FN: { |
7104f300 SR |
1755 | struct ftrace_entry *field; |
1756 | ||
1757 | trace_assign_type(field, entry); | |
777e208d SR |
1758 | |
1759 | SEQ_PUT_FIELD_RET(s, field->ip); | |
1760 | SEQ_PUT_FIELD_RET(s, field->parent_ip); | |
cb0f12aa | 1761 | break; |
777e208d SR |
1762 | } |
1763 | case TRACE_CTX: { | |
7104f300 SR |
1764 | struct ctx_switch_entry *field; |
1765 | ||
1766 | trace_assign_type(field, entry); | |
777e208d SR |
1767 | |
1768 | SEQ_PUT_FIELD_RET(s, field->prev_pid); | |
1769 | SEQ_PUT_FIELD_RET(s, field->prev_prio); | |
1770 | SEQ_PUT_FIELD_RET(s, field->prev_state); | |
1771 | SEQ_PUT_FIELD_RET(s, field->next_pid); | |
1772 | SEQ_PUT_FIELD_RET(s, field->next_prio); | |
1773 | SEQ_PUT_FIELD_RET(s, field->next_state); | |
cb0f12aa | 1774 | break; |
777e208d | 1775 | } |
f0a920d5 | 1776 | case TRACE_SPECIAL: |
777e208d | 1777 | case TRACE_STACK: { |
7104f300 SR |
1778 | struct special_entry *field; |
1779 | ||
1780 | trace_assign_type(field, entry); | |
777e208d SR |
1781 | |
1782 | SEQ_PUT_FIELD_RET(s, field->arg1); | |
1783 | SEQ_PUT_FIELD_RET(s, field->arg2); | |
1784 | SEQ_PUT_FIELD_RET(s, field->arg3); | |
f0a920d5 | 1785 | break; |
cb0f12aa | 1786 | } |
777e208d | 1787 | } |
cb0f12aa IM |
1788 | return 1; |
1789 | } | |
1790 | ||
bc0c38d1 SR |
1791 | static int trace_empty(struct trace_iterator *iter) |
1792 | { | |
bc0c38d1 SR |
1793 | int cpu; |
1794 | ||
ab46428c | 1795 | for_each_tracing_cpu(cpu) { |
d769041f SR |
1796 | if (iter->buffer_iter[cpu]) { |
1797 | if (!ring_buffer_iter_empty(iter->buffer_iter[cpu])) | |
1798 | return 0; | |
1799 | } else { | |
1800 | if (!ring_buffer_empty_cpu(iter->tr->buffer, cpu)) | |
1801 | return 0; | |
1802 | } | |
bc0c38d1 | 1803 | } |
d769041f | 1804 | |
797d3712 | 1805 | return 1; |
bc0c38d1 SR |
1806 | } |
1807 | ||
2c4f035f | 1808 | static enum print_line_t print_trace_line(struct trace_iterator *iter) |
f9896bf3 | 1809 | { |
2c4f035f FW |
1810 | enum print_line_t ret; |
1811 | ||
1812 | if (iter->trace && iter->trace->print_line) { | |
1813 | ret = iter->trace->print_line(iter); | |
1814 | if (ret != TRACE_TYPE_UNHANDLED) | |
1815 | return ret; | |
1816 | } | |
72829bc3 | 1817 | |
cb0f12aa IM |
1818 | if (trace_flags & TRACE_ITER_BIN) |
1819 | return print_bin_fmt(iter); | |
1820 | ||
5e3ca0ec IM |
1821 | if (trace_flags & TRACE_ITER_HEX) |
1822 | return print_hex_fmt(iter); | |
1823 | ||
f9896bf3 IM |
1824 | if (trace_flags & TRACE_ITER_RAW) |
1825 | return print_raw_fmt(iter); | |
1826 | ||
1827 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
1828 | return print_lat_fmt(iter, iter->idx, iter->cpu); | |
1829 | ||
1830 | return print_trace_fmt(iter); | |
1831 | } | |
1832 | ||
bc0c38d1 SR |
1833 | static int s_show(struct seq_file *m, void *v) |
1834 | { | |
1835 | struct trace_iterator *iter = v; | |
1836 | ||
1837 | if (iter->ent == NULL) { | |
1838 | if (iter->tr) { | |
1839 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
1840 | seq_puts(m, "#\n"); | |
1841 | } | |
1842 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { | |
1843 | /* print nothing if the buffers are empty */ | |
1844 | if (trace_empty(iter)) | |
1845 | return 0; | |
1846 | print_trace_header(m, iter); | |
1847 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1848 | print_lat_help_header(m); | |
1849 | } else { | |
1850 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1851 | print_func_help_header(m); | |
1852 | } | |
1853 | } else { | |
f9896bf3 | 1854 | print_trace_line(iter); |
214023c3 | 1855 | trace_print_seq(m, &iter->seq); |
bc0c38d1 SR |
1856 | } |
1857 | ||
1858 | return 0; | |
1859 | } | |
1860 | ||
1861 | static struct seq_operations tracer_seq_ops = { | |
4bf39a94 IM |
1862 | .start = s_start, |
1863 | .next = s_next, | |
1864 | .stop = s_stop, | |
1865 | .show = s_show, | |
bc0c38d1 SR |
1866 | }; |
1867 | ||
e309b41d | 1868 | static struct trace_iterator * |
bc0c38d1 SR |
1869 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
1870 | { | |
1871 | struct trace_iterator *iter; | |
3928a8a2 SR |
1872 | struct seq_file *m; |
1873 | int cpu; | |
bc0c38d1 | 1874 | |
60a11774 SR |
1875 | if (tracing_disabled) { |
1876 | *ret = -ENODEV; | |
1877 | return NULL; | |
1878 | } | |
1879 | ||
bc0c38d1 SR |
1880 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
1881 | if (!iter) { | |
1882 | *ret = -ENOMEM; | |
1883 | goto out; | |
1884 | } | |
1885 | ||
1886 | mutex_lock(&trace_types_lock); | |
1887 | if (current_trace && current_trace->print_max) | |
1888 | iter->tr = &max_tr; | |
1889 | else | |
1890 | iter->tr = inode->i_private; | |
1891 | iter->trace = current_trace; | |
1892 | iter->pos = -1; | |
1893 | ||
3928a8a2 | 1894 | for_each_tracing_cpu(cpu) { |
d769041f | 1895 | |
3928a8a2 SR |
1896 | iter->buffer_iter[cpu] = |
1897 | ring_buffer_read_start(iter->tr->buffer, cpu); | |
d769041f | 1898 | |
3928a8a2 SR |
1899 | if (!iter->buffer_iter[cpu]) |
1900 | goto fail_buffer; | |
1901 | } | |
1902 | ||
bc0c38d1 SR |
1903 | /* TODO stop tracer */ |
1904 | *ret = seq_open(file, &tracer_seq_ops); | |
3928a8a2 SR |
1905 | if (*ret) |
1906 | goto fail_buffer; | |
bc0c38d1 | 1907 | |
3928a8a2 SR |
1908 | m = file->private_data; |
1909 | m->private = iter; | |
bc0c38d1 | 1910 | |
3928a8a2 SR |
1911 | /* stop the trace while dumping */ |
1912 | if (iter->tr->ctrl) { | |
1913 | tracer_enabled = 0; | |
1914 | ftrace_function_enabled = 0; | |
bc0c38d1 | 1915 | } |
3928a8a2 SR |
1916 | |
1917 | if (iter->trace && iter->trace->open) | |
1918 | iter->trace->open(iter); | |
1919 | ||
bc0c38d1 SR |
1920 | mutex_unlock(&trace_types_lock); |
1921 | ||
1922 | out: | |
1923 | return iter; | |
3928a8a2 SR |
1924 | |
1925 | fail_buffer: | |
1926 | for_each_tracing_cpu(cpu) { | |
1927 | if (iter->buffer_iter[cpu]) | |
1928 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
1929 | } | |
1930 | mutex_unlock(&trace_types_lock); | |
1931 | ||
1932 | return ERR_PTR(-ENOMEM); | |
bc0c38d1 SR |
1933 | } |
1934 | ||
1935 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
1936 | { | |
60a11774 SR |
1937 | if (tracing_disabled) |
1938 | return -ENODEV; | |
1939 | ||
bc0c38d1 SR |
1940 | filp->private_data = inode->i_private; |
1941 | return 0; | |
1942 | } | |
1943 | ||
1944 | int tracing_release(struct inode *inode, struct file *file) | |
1945 | { | |
1946 | struct seq_file *m = (struct seq_file *)file->private_data; | |
1947 | struct trace_iterator *iter = m->private; | |
3928a8a2 | 1948 | int cpu; |
bc0c38d1 SR |
1949 | |
1950 | mutex_lock(&trace_types_lock); | |
3928a8a2 SR |
1951 | for_each_tracing_cpu(cpu) { |
1952 | if (iter->buffer_iter[cpu]) | |
1953 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
1954 | } | |
1955 | ||
bc0c38d1 SR |
1956 | if (iter->trace && iter->trace->close) |
1957 | iter->trace->close(iter); | |
1958 | ||
1959 | /* reenable tracing if it was previously enabled */ | |
60bc0800 | 1960 | if (iter->tr->ctrl) { |
bc0c38d1 | 1961 | tracer_enabled = 1; |
60bc0800 SR |
1962 | /* |
1963 | * It is safe to enable function tracing even if it | |
1964 | * isn't used | |
1965 | */ | |
1966 | ftrace_function_enabled = 1; | |
1967 | } | |
bc0c38d1 SR |
1968 | mutex_unlock(&trace_types_lock); |
1969 | ||
1970 | seq_release(inode, file); | |
1971 | kfree(iter); | |
1972 | return 0; | |
1973 | } | |
1974 | ||
1975 | static int tracing_open(struct inode *inode, struct file *file) | |
1976 | { | |
1977 | int ret; | |
1978 | ||
1979 | __tracing_open(inode, file, &ret); | |
1980 | ||
1981 | return ret; | |
1982 | } | |
1983 | ||
1984 | static int tracing_lt_open(struct inode *inode, struct file *file) | |
1985 | { | |
1986 | struct trace_iterator *iter; | |
1987 | int ret; | |
1988 | ||
1989 | iter = __tracing_open(inode, file, &ret); | |
1990 | ||
1991 | if (!ret) | |
1992 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
1993 | ||
1994 | return ret; | |
1995 | } | |
1996 | ||
1997 | ||
e309b41d | 1998 | static void * |
bc0c38d1 SR |
1999 | t_next(struct seq_file *m, void *v, loff_t *pos) |
2000 | { | |
2001 | struct tracer *t = m->private; | |
2002 | ||
2003 | (*pos)++; | |
2004 | ||
2005 | if (t) | |
2006 | t = t->next; | |
2007 | ||
2008 | m->private = t; | |
2009 | ||
2010 | return t; | |
2011 | } | |
2012 | ||
2013 | static void *t_start(struct seq_file *m, loff_t *pos) | |
2014 | { | |
2015 | struct tracer *t = m->private; | |
2016 | loff_t l = 0; | |
2017 | ||
2018 | mutex_lock(&trace_types_lock); | |
2019 | for (; t && l < *pos; t = t_next(m, t, &l)) | |
2020 | ; | |
2021 | ||
2022 | return t; | |
2023 | } | |
2024 | ||
2025 | static void t_stop(struct seq_file *m, void *p) | |
2026 | { | |
2027 | mutex_unlock(&trace_types_lock); | |
2028 | } | |
2029 | ||
2030 | static int t_show(struct seq_file *m, void *v) | |
2031 | { | |
2032 | struct tracer *t = v; | |
2033 | ||
2034 | if (!t) | |
2035 | return 0; | |
2036 | ||
2037 | seq_printf(m, "%s", t->name); | |
2038 | if (t->next) | |
2039 | seq_putc(m, ' '); | |
2040 | else | |
2041 | seq_putc(m, '\n'); | |
2042 | ||
2043 | return 0; | |
2044 | } | |
2045 | ||
2046 | static struct seq_operations show_traces_seq_ops = { | |
4bf39a94 IM |
2047 | .start = t_start, |
2048 | .next = t_next, | |
2049 | .stop = t_stop, | |
2050 | .show = t_show, | |
bc0c38d1 SR |
2051 | }; |
2052 | ||
2053 | static int show_traces_open(struct inode *inode, struct file *file) | |
2054 | { | |
2055 | int ret; | |
2056 | ||
60a11774 SR |
2057 | if (tracing_disabled) |
2058 | return -ENODEV; | |
2059 | ||
bc0c38d1 SR |
2060 | ret = seq_open(file, &show_traces_seq_ops); |
2061 | if (!ret) { | |
2062 | struct seq_file *m = file->private_data; | |
2063 | m->private = trace_types; | |
2064 | } | |
2065 | ||
2066 | return ret; | |
2067 | } | |
2068 | ||
2069 | static struct file_operations tracing_fops = { | |
4bf39a94 IM |
2070 | .open = tracing_open, |
2071 | .read = seq_read, | |
2072 | .llseek = seq_lseek, | |
2073 | .release = tracing_release, | |
bc0c38d1 SR |
2074 | }; |
2075 | ||
2076 | static struct file_operations tracing_lt_fops = { | |
4bf39a94 IM |
2077 | .open = tracing_lt_open, |
2078 | .read = seq_read, | |
2079 | .llseek = seq_lseek, | |
2080 | .release = tracing_release, | |
bc0c38d1 SR |
2081 | }; |
2082 | ||
2083 | static struct file_operations show_traces_fops = { | |
c7078de1 IM |
2084 | .open = show_traces_open, |
2085 | .read = seq_read, | |
2086 | .release = seq_release, | |
2087 | }; | |
2088 | ||
36dfe925 IM |
2089 | /* |
2090 | * Only trace on a CPU if the bitmask is set: | |
2091 | */ | |
2092 | static cpumask_t tracing_cpumask = CPU_MASK_ALL; | |
2093 | ||
2094 | /* | |
2095 | * When tracing/tracing_cpu_mask is modified then this holds | |
2096 | * the new bitmask we are about to install: | |
2097 | */ | |
2098 | static cpumask_t tracing_cpumask_new; | |
2099 | ||
2100 | /* | |
2101 | * The tracer itself will not take this lock, but still we want | |
2102 | * to provide a consistent cpumask to user-space: | |
2103 | */ | |
2104 | static DEFINE_MUTEX(tracing_cpumask_update_lock); | |
2105 | ||
2106 | /* | |
2107 | * Temporary storage for the character representation of the | |
2108 | * CPU bitmask (and one more byte for the newline): | |
2109 | */ | |
2110 | static char mask_str[NR_CPUS + 1]; | |
2111 | ||
c7078de1 IM |
2112 | static ssize_t |
2113 | tracing_cpumask_read(struct file *filp, char __user *ubuf, | |
2114 | size_t count, loff_t *ppos) | |
2115 | { | |
36dfe925 | 2116 | int len; |
c7078de1 IM |
2117 | |
2118 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 IM |
2119 | |
2120 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); | |
2121 | if (count - len < 2) { | |
2122 | count = -EINVAL; | |
2123 | goto out_err; | |
2124 | } | |
2125 | len += sprintf(mask_str + len, "\n"); | |
2126 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); | |
2127 | ||
2128 | out_err: | |
c7078de1 IM |
2129 | mutex_unlock(&tracing_cpumask_update_lock); |
2130 | ||
2131 | return count; | |
2132 | } | |
2133 | ||
2134 | static ssize_t | |
2135 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, | |
2136 | size_t count, loff_t *ppos) | |
2137 | { | |
36dfe925 | 2138 | int err, cpu; |
c7078de1 IM |
2139 | |
2140 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 | 2141 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
c7078de1 | 2142 | if (err) |
36dfe925 IM |
2143 | goto err_unlock; |
2144 | ||
92205c23 SR |
2145 | raw_local_irq_disable(); |
2146 | __raw_spin_lock(&ftrace_max_lock); | |
ab46428c | 2147 | for_each_tracing_cpu(cpu) { |
36dfe925 IM |
2148 | /* |
2149 | * Increase/decrease the disabled counter if we are | |
2150 | * about to flip a bit in the cpumask: | |
2151 | */ | |
2152 | if (cpu_isset(cpu, tracing_cpumask) && | |
2153 | !cpu_isset(cpu, tracing_cpumask_new)) { | |
2154 | atomic_inc(&global_trace.data[cpu]->disabled); | |
2155 | } | |
2156 | if (!cpu_isset(cpu, tracing_cpumask) && | |
2157 | cpu_isset(cpu, tracing_cpumask_new)) { | |
2158 | atomic_dec(&global_trace.data[cpu]->disabled); | |
2159 | } | |
2160 | } | |
92205c23 SR |
2161 | __raw_spin_unlock(&ftrace_max_lock); |
2162 | raw_local_irq_enable(); | |
36dfe925 IM |
2163 | |
2164 | tracing_cpumask = tracing_cpumask_new; | |
2165 | ||
2166 | mutex_unlock(&tracing_cpumask_update_lock); | |
c7078de1 IM |
2167 | |
2168 | return count; | |
36dfe925 IM |
2169 | |
2170 | err_unlock: | |
2171 | mutex_unlock(&tracing_cpumask_update_lock); | |
2172 | ||
2173 | return err; | |
c7078de1 IM |
2174 | } |
2175 | ||
2176 | static struct file_operations tracing_cpumask_fops = { | |
2177 | .open = tracing_open_generic, | |
2178 | .read = tracing_cpumask_read, | |
2179 | .write = tracing_cpumask_write, | |
bc0c38d1 SR |
2180 | }; |
2181 | ||
2182 | static ssize_t | |
2183 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, | |
2184 | size_t cnt, loff_t *ppos) | |
2185 | { | |
2186 | char *buf; | |
2187 | int r = 0; | |
2188 | int len = 0; | |
2189 | int i; | |
2190 | ||
2191 | /* calulate max size */ | |
2192 | for (i = 0; trace_options[i]; i++) { | |
2193 | len += strlen(trace_options[i]); | |
2194 | len += 3; /* "no" and space */ | |
2195 | } | |
2196 | ||
2197 | /* +2 for \n and \0 */ | |
2198 | buf = kmalloc(len + 2, GFP_KERNEL); | |
2199 | if (!buf) | |
2200 | return -ENOMEM; | |
2201 | ||
2202 | for (i = 0; trace_options[i]; i++) { | |
2203 | if (trace_flags & (1 << i)) | |
2204 | r += sprintf(buf + r, "%s ", trace_options[i]); | |
2205 | else | |
2206 | r += sprintf(buf + r, "no%s ", trace_options[i]); | |
2207 | } | |
2208 | ||
2209 | r += sprintf(buf + r, "\n"); | |
2210 | WARN_ON(r >= len + 2); | |
2211 | ||
36dfe925 | 2212 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2213 | |
2214 | kfree(buf); | |
2215 | ||
2216 | return r; | |
2217 | } | |
2218 | ||
2219 | static ssize_t | |
2220 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, | |
2221 | size_t cnt, loff_t *ppos) | |
2222 | { | |
2223 | char buf[64]; | |
2224 | char *cmp = buf; | |
2225 | int neg = 0; | |
2226 | int i; | |
2227 | ||
cffae437 SR |
2228 | if (cnt >= sizeof(buf)) |
2229 | return -EINVAL; | |
bc0c38d1 SR |
2230 | |
2231 | if (copy_from_user(&buf, ubuf, cnt)) | |
2232 | return -EFAULT; | |
2233 | ||
2234 | buf[cnt] = 0; | |
2235 | ||
2236 | if (strncmp(buf, "no", 2) == 0) { | |
2237 | neg = 1; | |
2238 | cmp += 2; | |
2239 | } | |
2240 | ||
2241 | for (i = 0; trace_options[i]; i++) { | |
2242 | int len = strlen(trace_options[i]); | |
2243 | ||
2244 | if (strncmp(cmp, trace_options[i], len) == 0) { | |
2245 | if (neg) | |
2246 | trace_flags &= ~(1 << i); | |
2247 | else | |
2248 | trace_flags |= (1 << i); | |
2249 | break; | |
2250 | } | |
2251 | } | |
442e544c IM |
2252 | /* |
2253 | * If no option could be set, return an error: | |
2254 | */ | |
2255 | if (!trace_options[i]) | |
2256 | return -EINVAL; | |
bc0c38d1 SR |
2257 | |
2258 | filp->f_pos += cnt; | |
2259 | ||
2260 | return cnt; | |
2261 | } | |
2262 | ||
2263 | static struct file_operations tracing_iter_fops = { | |
c7078de1 IM |
2264 | .open = tracing_open_generic, |
2265 | .read = tracing_iter_ctrl_read, | |
2266 | .write = tracing_iter_ctrl_write, | |
bc0c38d1 SR |
2267 | }; |
2268 | ||
7bd2f24c IM |
2269 | static const char readme_msg[] = |
2270 | "tracing mini-HOWTO:\n\n" | |
2271 | "# mkdir /debug\n" | |
2272 | "# mount -t debugfs nodev /debug\n\n" | |
2273 | "# cat /debug/tracing/available_tracers\n" | |
2274 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" | |
2275 | "# cat /debug/tracing/current_tracer\n" | |
2276 | "none\n" | |
2277 | "# echo sched_switch > /debug/tracing/current_tracer\n" | |
2278 | "# cat /debug/tracing/current_tracer\n" | |
2279 | "sched_switch\n" | |
2280 | "# cat /debug/tracing/iter_ctrl\n" | |
2281 | "noprint-parent nosym-offset nosym-addr noverbose\n" | |
2282 | "# echo print-parent > /debug/tracing/iter_ctrl\n" | |
2283 | "# echo 1 > /debug/tracing/tracing_enabled\n" | |
2284 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" | |
2285 | "echo 0 > /debug/tracing/tracing_enabled\n" | |
2286 | ; | |
2287 | ||
2288 | static ssize_t | |
2289 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
2290 | size_t cnt, loff_t *ppos) | |
2291 | { | |
2292 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
2293 | readme_msg, strlen(readme_msg)); | |
2294 | } | |
2295 | ||
2296 | static struct file_operations tracing_readme_fops = { | |
c7078de1 IM |
2297 | .open = tracing_open_generic, |
2298 | .read = tracing_readme_read, | |
7bd2f24c IM |
2299 | }; |
2300 | ||
bc0c38d1 SR |
2301 | static ssize_t |
2302 | tracing_ctrl_read(struct file *filp, char __user *ubuf, | |
2303 | size_t cnt, loff_t *ppos) | |
2304 | { | |
2305 | struct trace_array *tr = filp->private_data; | |
2306 | char buf[64]; | |
2307 | int r; | |
2308 | ||
2309 | r = sprintf(buf, "%ld\n", tr->ctrl); | |
4e3c3333 | 2310 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2311 | } |
2312 | ||
2313 | static ssize_t | |
2314 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, | |
2315 | size_t cnt, loff_t *ppos) | |
2316 | { | |
2317 | struct trace_array *tr = filp->private_data; | |
bc0c38d1 | 2318 | char buf[64]; |
c6caeeb1 SR |
2319 | long val; |
2320 | int ret; | |
bc0c38d1 | 2321 | |
cffae437 SR |
2322 | if (cnt >= sizeof(buf)) |
2323 | return -EINVAL; | |
bc0c38d1 SR |
2324 | |
2325 | if (copy_from_user(&buf, ubuf, cnt)) | |
2326 | return -EFAULT; | |
2327 | ||
2328 | buf[cnt] = 0; | |
2329 | ||
c6caeeb1 SR |
2330 | ret = strict_strtoul(buf, 10, &val); |
2331 | if (ret < 0) | |
2332 | return ret; | |
bc0c38d1 SR |
2333 | |
2334 | val = !!val; | |
2335 | ||
2336 | mutex_lock(&trace_types_lock); | |
2337 | if (tr->ctrl ^ val) { | |
2338 | if (val) | |
2339 | tracer_enabled = 1; | |
2340 | else | |
2341 | tracer_enabled = 0; | |
2342 | ||
2343 | tr->ctrl = val; | |
2344 | ||
2345 | if (current_trace && current_trace->ctrl_update) | |
2346 | current_trace->ctrl_update(tr); | |
2347 | } | |
2348 | mutex_unlock(&trace_types_lock); | |
2349 | ||
2350 | filp->f_pos += cnt; | |
2351 | ||
2352 | return cnt; | |
2353 | } | |
2354 | ||
2355 | static ssize_t | |
2356 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
2357 | size_t cnt, loff_t *ppos) | |
2358 | { | |
2359 | char buf[max_tracer_type_len+2]; | |
2360 | int r; | |
2361 | ||
2362 | mutex_lock(&trace_types_lock); | |
2363 | if (current_trace) | |
2364 | r = sprintf(buf, "%s\n", current_trace->name); | |
2365 | else | |
2366 | r = sprintf(buf, "\n"); | |
2367 | mutex_unlock(&trace_types_lock); | |
2368 | ||
4bf39a94 | 2369 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2370 | } |
2371 | ||
2372 | static ssize_t | |
2373 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
2374 | size_t cnt, loff_t *ppos) | |
2375 | { | |
2376 | struct trace_array *tr = &global_trace; | |
2377 | struct tracer *t; | |
2378 | char buf[max_tracer_type_len+1]; | |
2379 | int i; | |
c2931e05 | 2380 | size_t ret; |
bc0c38d1 SR |
2381 | |
2382 | if (cnt > max_tracer_type_len) | |
2383 | cnt = max_tracer_type_len; | |
c2931e05 | 2384 | ret = cnt; |
bc0c38d1 SR |
2385 | |
2386 | if (copy_from_user(&buf, ubuf, cnt)) | |
2387 | return -EFAULT; | |
2388 | ||
2389 | buf[cnt] = 0; | |
2390 | ||
2391 | /* strip ending whitespace. */ | |
2392 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
2393 | buf[i] = 0; | |
2394 | ||
2395 | mutex_lock(&trace_types_lock); | |
2396 | for (t = trace_types; t; t = t->next) { | |
2397 | if (strcmp(t->name, buf) == 0) | |
2398 | break; | |
2399 | } | |
c2931e05 FW |
2400 | if (!t) { |
2401 | ret = -EINVAL; | |
2402 | goto out; | |
2403 | } | |
2404 | if (t == current_trace) | |
bc0c38d1 SR |
2405 | goto out; |
2406 | ||
2407 | if (current_trace && current_trace->reset) | |
2408 | current_trace->reset(tr); | |
2409 | ||
2410 | current_trace = t; | |
2411 | if (t->init) | |
2412 | t->init(tr); | |
2413 | ||
2414 | out: | |
2415 | mutex_unlock(&trace_types_lock); | |
2416 | ||
c2931e05 FW |
2417 | if (ret == cnt) |
2418 | filp->f_pos += cnt; | |
bc0c38d1 | 2419 | |
c2931e05 | 2420 | return ret; |
bc0c38d1 SR |
2421 | } |
2422 | ||
2423 | static ssize_t | |
2424 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
2425 | size_t cnt, loff_t *ppos) | |
2426 | { | |
2427 | unsigned long *ptr = filp->private_data; | |
2428 | char buf[64]; | |
2429 | int r; | |
2430 | ||
cffae437 | 2431 | r = snprintf(buf, sizeof(buf), "%ld\n", |
bc0c38d1 | 2432 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
cffae437 SR |
2433 | if (r > sizeof(buf)) |
2434 | r = sizeof(buf); | |
4bf39a94 | 2435 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2436 | } |
2437 | ||
2438 | static ssize_t | |
2439 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
2440 | size_t cnt, loff_t *ppos) | |
2441 | { | |
2442 | long *ptr = filp->private_data; | |
bc0c38d1 | 2443 | char buf[64]; |
c6caeeb1 SR |
2444 | long val; |
2445 | int ret; | |
bc0c38d1 | 2446 | |
cffae437 SR |
2447 | if (cnt >= sizeof(buf)) |
2448 | return -EINVAL; | |
bc0c38d1 SR |
2449 | |
2450 | if (copy_from_user(&buf, ubuf, cnt)) | |
2451 | return -EFAULT; | |
2452 | ||
2453 | buf[cnt] = 0; | |
2454 | ||
c6caeeb1 SR |
2455 | ret = strict_strtoul(buf, 10, &val); |
2456 | if (ret < 0) | |
2457 | return ret; | |
bc0c38d1 SR |
2458 | |
2459 | *ptr = val * 1000; | |
2460 | ||
2461 | return cnt; | |
2462 | } | |
2463 | ||
b3806b43 SR |
2464 | static atomic_t tracing_reader; |
2465 | ||
2466 | static int tracing_open_pipe(struct inode *inode, struct file *filp) | |
2467 | { | |
2468 | struct trace_iterator *iter; | |
2469 | ||
2470 | if (tracing_disabled) | |
2471 | return -ENODEV; | |
2472 | ||
2473 | /* We only allow for reader of the pipe */ | |
2474 | if (atomic_inc_return(&tracing_reader) != 1) { | |
2475 | atomic_dec(&tracing_reader); | |
2476 | return -EBUSY; | |
2477 | } | |
2478 | ||
2479 | /* create a buffer to store the information to pass to userspace */ | |
2480 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
2481 | if (!iter) | |
2482 | return -ENOMEM; | |
2483 | ||
107bad8b | 2484 | mutex_lock(&trace_types_lock); |
b3806b43 | 2485 | iter->tr = &global_trace; |
72829bc3 | 2486 | iter->trace = current_trace; |
b3806b43 SR |
2487 | filp->private_data = iter; |
2488 | ||
107bad8b SR |
2489 | if (iter->trace->pipe_open) |
2490 | iter->trace->pipe_open(iter); | |
2491 | mutex_unlock(&trace_types_lock); | |
2492 | ||
b3806b43 SR |
2493 | return 0; |
2494 | } | |
2495 | ||
2496 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
2497 | { | |
2498 | struct trace_iterator *iter = file->private_data; | |
2499 | ||
2500 | kfree(iter); | |
2501 | atomic_dec(&tracing_reader); | |
2502 | ||
2503 | return 0; | |
2504 | } | |
2505 | ||
2a2cc8f7 SSP |
2506 | static unsigned int |
2507 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) | |
2508 | { | |
2509 | struct trace_iterator *iter = filp->private_data; | |
2510 | ||
2511 | if (trace_flags & TRACE_ITER_BLOCK) { | |
2512 | /* | |
2513 | * Always select as readable when in blocking mode | |
2514 | */ | |
2515 | return POLLIN | POLLRDNORM; | |
afc2abc0 | 2516 | } else { |
2a2cc8f7 SSP |
2517 | if (!trace_empty(iter)) |
2518 | return POLLIN | POLLRDNORM; | |
2519 | poll_wait(filp, &trace_wait, poll_table); | |
2520 | if (!trace_empty(iter)) | |
2521 | return POLLIN | POLLRDNORM; | |
2522 | ||
2523 | return 0; | |
2524 | } | |
2525 | } | |
2526 | ||
b3806b43 SR |
2527 | /* |
2528 | * Consumer reader. | |
2529 | */ | |
2530 | static ssize_t | |
2531 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
2532 | size_t cnt, loff_t *ppos) | |
2533 | { | |
2534 | struct trace_iterator *iter = filp->private_data; | |
6c6c2796 | 2535 | ssize_t sret; |
b3806b43 SR |
2536 | |
2537 | /* return any leftover data */ | |
6c6c2796 PP |
2538 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
2539 | if (sret != -EBUSY) | |
2540 | return sret; | |
b3806b43 | 2541 | |
6c6c2796 | 2542 | trace_seq_reset(&iter->seq); |
b3806b43 | 2543 | |
107bad8b SR |
2544 | mutex_lock(&trace_types_lock); |
2545 | if (iter->trace->read) { | |
6c6c2796 PP |
2546 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); |
2547 | if (sret) | |
107bad8b | 2548 | goto out; |
107bad8b SR |
2549 | } |
2550 | ||
9ff4b974 PP |
2551 | waitagain: |
2552 | sret = 0; | |
b3806b43 | 2553 | while (trace_empty(iter)) { |
2dc8f095 | 2554 | |
107bad8b | 2555 | if ((filp->f_flags & O_NONBLOCK)) { |
6c6c2796 | 2556 | sret = -EAGAIN; |
107bad8b SR |
2557 | goto out; |
2558 | } | |
2dc8f095 | 2559 | |
b3806b43 SR |
2560 | /* |
2561 | * This is a make-shift waitqueue. The reason we don't use | |
2562 | * an actual wait queue is because: | |
2563 | * 1) we only ever have one waiter | |
2564 | * 2) the tracing, traces all functions, we don't want | |
2565 | * the overhead of calling wake_up and friends | |
2566 | * (and tracing them too) | |
2567 | * Anyway, this is really very primitive wakeup. | |
2568 | */ | |
2569 | set_current_state(TASK_INTERRUPTIBLE); | |
2570 | iter->tr->waiter = current; | |
2571 | ||
107bad8b SR |
2572 | mutex_unlock(&trace_types_lock); |
2573 | ||
9fe068e9 IM |
2574 | /* sleep for 100 msecs, and try again. */ |
2575 | schedule_timeout(HZ/10); | |
b3806b43 | 2576 | |
107bad8b SR |
2577 | mutex_lock(&trace_types_lock); |
2578 | ||
b3806b43 SR |
2579 | iter->tr->waiter = NULL; |
2580 | ||
107bad8b | 2581 | if (signal_pending(current)) { |
6c6c2796 | 2582 | sret = -EINTR; |
107bad8b SR |
2583 | goto out; |
2584 | } | |
b3806b43 | 2585 | |
84527997 | 2586 | if (iter->trace != current_trace) |
107bad8b | 2587 | goto out; |
84527997 | 2588 | |
b3806b43 SR |
2589 | /* |
2590 | * We block until we read something and tracing is disabled. | |
2591 | * We still block if tracing is disabled, but we have never | |
2592 | * read anything. This allows a user to cat this file, and | |
2593 | * then enable tracing. But after we have read something, | |
2594 | * we give an EOF when tracing is again disabled. | |
2595 | * | |
2596 | * iter->pos will be 0 if we haven't read anything. | |
2597 | */ | |
2598 | if (!tracer_enabled && iter->pos) | |
2599 | break; | |
2600 | ||
2601 | continue; | |
2602 | } | |
2603 | ||
2604 | /* stop when tracing is finished */ | |
2605 | if (trace_empty(iter)) | |
107bad8b | 2606 | goto out; |
b3806b43 SR |
2607 | |
2608 | if (cnt >= PAGE_SIZE) | |
2609 | cnt = PAGE_SIZE - 1; | |
2610 | ||
53d0aa77 | 2611 | /* reset all but tr, trace, and overruns */ |
53d0aa77 SR |
2612 | memset(&iter->seq, 0, |
2613 | sizeof(struct trace_iterator) - | |
2614 | offsetof(struct trace_iterator, seq)); | |
4823ed7e | 2615 | iter->pos = -1; |
b3806b43 | 2616 | |
088b1e42 | 2617 | while (find_next_entry_inc(iter) != NULL) { |
2c4f035f | 2618 | enum print_line_t ret; |
088b1e42 SR |
2619 | int len = iter->seq.len; |
2620 | ||
f9896bf3 | 2621 | ret = print_trace_line(iter); |
2c4f035f | 2622 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
088b1e42 SR |
2623 | /* don't print partial lines */ |
2624 | iter->seq.len = len; | |
b3806b43 | 2625 | break; |
088b1e42 | 2626 | } |
b3806b43 SR |
2627 | |
2628 | trace_consume(iter); | |
2629 | ||
2630 | if (iter->seq.len >= cnt) | |
2631 | break; | |
b3806b43 SR |
2632 | } |
2633 | ||
b3806b43 | 2634 | /* Now copy what we have to the user */ |
6c6c2796 PP |
2635 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
2636 | if (iter->seq.readpos >= iter->seq.len) | |
b3806b43 | 2637 | trace_seq_reset(&iter->seq); |
9ff4b974 PP |
2638 | |
2639 | /* | |
2640 | * If there was nothing to send to user, inspite of consuming trace | |
2641 | * entries, go back to wait for more entries. | |
2642 | */ | |
6c6c2796 | 2643 | if (sret == -EBUSY) |
9ff4b974 | 2644 | goto waitagain; |
b3806b43 | 2645 | |
107bad8b SR |
2646 | out: |
2647 | mutex_unlock(&trace_types_lock); | |
2648 | ||
6c6c2796 | 2649 | return sret; |
b3806b43 SR |
2650 | } |
2651 | ||
a98a3c3f SR |
2652 | static ssize_t |
2653 | tracing_entries_read(struct file *filp, char __user *ubuf, | |
2654 | size_t cnt, loff_t *ppos) | |
2655 | { | |
2656 | struct trace_array *tr = filp->private_data; | |
2657 | char buf[64]; | |
2658 | int r; | |
2659 | ||
2660 | r = sprintf(buf, "%lu\n", tr->entries); | |
2661 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
2662 | } | |
2663 | ||
2664 | static ssize_t | |
2665 | tracing_entries_write(struct file *filp, const char __user *ubuf, | |
2666 | size_t cnt, loff_t *ppos) | |
2667 | { | |
2668 | unsigned long val; | |
2669 | char buf[64]; | |
3928a8a2 | 2670 | int ret; |
43a15386 | 2671 | struct trace_array *tr = filp->private_data; |
a98a3c3f | 2672 | |
cffae437 SR |
2673 | if (cnt >= sizeof(buf)) |
2674 | return -EINVAL; | |
a98a3c3f SR |
2675 | |
2676 | if (copy_from_user(&buf, ubuf, cnt)) | |
2677 | return -EFAULT; | |
2678 | ||
2679 | buf[cnt] = 0; | |
2680 | ||
c6caeeb1 SR |
2681 | ret = strict_strtoul(buf, 10, &val); |
2682 | if (ret < 0) | |
2683 | return ret; | |
a98a3c3f SR |
2684 | |
2685 | /* must have at least 1 entry */ | |
2686 | if (!val) | |
2687 | return -EINVAL; | |
2688 | ||
2689 | mutex_lock(&trace_types_lock); | |
2690 | ||
43a15386 | 2691 | if (tr->ctrl) { |
a98a3c3f | 2692 | cnt = -EBUSY; |
43a15386 | 2693 | pr_info("ftrace: please disable tracing" |
a98a3c3f SR |
2694 | " before modifying buffer size\n"); |
2695 | goto out; | |
2696 | } | |
2697 | ||
3928a8a2 SR |
2698 | if (val != global_trace.entries) { |
2699 | ret = ring_buffer_resize(global_trace.buffer, val); | |
2700 | if (ret < 0) { | |
2701 | cnt = ret; | |
3eefae99 SR |
2702 | goto out; |
2703 | } | |
2704 | ||
3928a8a2 SR |
2705 | ret = ring_buffer_resize(max_tr.buffer, val); |
2706 | if (ret < 0) { | |
2707 | int r; | |
2708 | cnt = ret; | |
2709 | r = ring_buffer_resize(global_trace.buffer, | |
2710 | global_trace.entries); | |
2711 | if (r < 0) { | |
2712 | /* AARGH! We are left with different | |
2713 | * size max buffer!!!! */ | |
2714 | WARN_ON(1); | |
2715 | tracing_disabled = 1; | |
a98a3c3f | 2716 | } |
3928a8a2 | 2717 | goto out; |
a98a3c3f | 2718 | } |
3eefae99 | 2719 | |
3928a8a2 | 2720 | global_trace.entries = val; |
a98a3c3f SR |
2721 | } |
2722 | ||
2723 | filp->f_pos += cnt; | |
2724 | ||
19384c03 SR |
2725 | /* If check pages failed, return ENOMEM */ |
2726 | if (tracing_disabled) | |
2727 | cnt = -ENOMEM; | |
a98a3c3f SR |
2728 | out: |
2729 | max_tr.entries = global_trace.entries; | |
2730 | mutex_unlock(&trace_types_lock); | |
2731 | ||
2732 | return cnt; | |
2733 | } | |
2734 | ||
5bf9a1ee PP |
2735 | static int mark_printk(const char *fmt, ...) |
2736 | { | |
2737 | int ret; | |
2738 | va_list args; | |
2739 | va_start(args, fmt); | |
2740 | ret = trace_vprintk(0, fmt, args); | |
2741 | va_end(args); | |
2742 | return ret; | |
2743 | } | |
2744 | ||
2745 | static ssize_t | |
2746 | tracing_mark_write(struct file *filp, const char __user *ubuf, | |
2747 | size_t cnt, loff_t *fpos) | |
2748 | { | |
2749 | char *buf; | |
2750 | char *end; | |
2751 | struct trace_array *tr = &global_trace; | |
2752 | ||
43a15386 | 2753 | if (!tr->ctrl || tracing_disabled) |
5bf9a1ee PP |
2754 | return -EINVAL; |
2755 | ||
2756 | if (cnt > TRACE_BUF_SIZE) | |
2757 | cnt = TRACE_BUF_SIZE; | |
2758 | ||
2759 | buf = kmalloc(cnt + 1, GFP_KERNEL); | |
2760 | if (buf == NULL) | |
2761 | return -ENOMEM; | |
2762 | ||
2763 | if (copy_from_user(buf, ubuf, cnt)) { | |
2764 | kfree(buf); | |
2765 | return -EFAULT; | |
2766 | } | |
2767 | ||
2768 | /* Cut from the first nil or newline. */ | |
2769 | buf[cnt] = '\0'; | |
2770 | end = strchr(buf, '\n'); | |
2771 | if (end) | |
2772 | *end = '\0'; | |
2773 | ||
2774 | cnt = mark_printk("%s\n", buf); | |
2775 | kfree(buf); | |
2776 | *fpos += cnt; | |
2777 | ||
2778 | return cnt; | |
2779 | } | |
2780 | ||
bc0c38d1 | 2781 | static struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
2782 | .open = tracing_open_generic, |
2783 | .read = tracing_max_lat_read, | |
2784 | .write = tracing_max_lat_write, | |
bc0c38d1 SR |
2785 | }; |
2786 | ||
2787 | static struct file_operations tracing_ctrl_fops = { | |
4bf39a94 IM |
2788 | .open = tracing_open_generic, |
2789 | .read = tracing_ctrl_read, | |
2790 | .write = tracing_ctrl_write, | |
bc0c38d1 SR |
2791 | }; |
2792 | ||
2793 | static struct file_operations set_tracer_fops = { | |
4bf39a94 IM |
2794 | .open = tracing_open_generic, |
2795 | .read = tracing_set_trace_read, | |
2796 | .write = tracing_set_trace_write, | |
bc0c38d1 SR |
2797 | }; |
2798 | ||
b3806b43 | 2799 | static struct file_operations tracing_pipe_fops = { |
4bf39a94 | 2800 | .open = tracing_open_pipe, |
2a2cc8f7 | 2801 | .poll = tracing_poll_pipe, |
4bf39a94 IM |
2802 | .read = tracing_read_pipe, |
2803 | .release = tracing_release_pipe, | |
b3806b43 SR |
2804 | }; |
2805 | ||
a98a3c3f SR |
2806 | static struct file_operations tracing_entries_fops = { |
2807 | .open = tracing_open_generic, | |
2808 | .read = tracing_entries_read, | |
2809 | .write = tracing_entries_write, | |
2810 | }; | |
2811 | ||
5bf9a1ee | 2812 | static struct file_operations tracing_mark_fops = { |
43a15386 | 2813 | .open = tracing_open_generic, |
5bf9a1ee PP |
2814 | .write = tracing_mark_write, |
2815 | }; | |
2816 | ||
bc0c38d1 SR |
2817 | #ifdef CONFIG_DYNAMIC_FTRACE |
2818 | ||
2819 | static ssize_t | |
2820 | tracing_read_long(struct file *filp, char __user *ubuf, | |
2821 | size_t cnt, loff_t *ppos) | |
2822 | { | |
2823 | unsigned long *p = filp->private_data; | |
2824 | char buf[64]; | |
2825 | int r; | |
2826 | ||
2827 | r = sprintf(buf, "%ld\n", *p); | |
4bf39a94 IM |
2828 | |
2829 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
bc0c38d1 SR |
2830 | } |
2831 | ||
2832 | static struct file_operations tracing_read_long_fops = { | |
4bf39a94 IM |
2833 | .open = tracing_open_generic, |
2834 | .read = tracing_read_long, | |
bc0c38d1 SR |
2835 | }; |
2836 | #endif | |
2837 | ||
2838 | static struct dentry *d_tracer; | |
2839 | ||
2840 | struct dentry *tracing_init_dentry(void) | |
2841 | { | |
2842 | static int once; | |
2843 | ||
2844 | if (d_tracer) | |
2845 | return d_tracer; | |
2846 | ||
2847 | d_tracer = debugfs_create_dir("tracing", NULL); | |
2848 | ||
2849 | if (!d_tracer && !once) { | |
2850 | once = 1; | |
2851 | pr_warning("Could not create debugfs directory 'tracing'\n"); | |
2852 | return NULL; | |
2853 | } | |
2854 | ||
2855 | return d_tracer; | |
2856 | } | |
2857 | ||
60a11774 SR |
2858 | #ifdef CONFIG_FTRACE_SELFTEST |
2859 | /* Let selftest have access to static functions in this file */ | |
2860 | #include "trace_selftest.c" | |
2861 | #endif | |
2862 | ||
b5ad384e | 2863 | static __init int tracer_init_debugfs(void) |
bc0c38d1 SR |
2864 | { |
2865 | struct dentry *d_tracer; | |
2866 | struct dentry *entry; | |
2867 | ||
2868 | d_tracer = tracing_init_dentry(); | |
2869 | ||
2870 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, | |
2871 | &global_trace, &tracing_ctrl_fops); | |
2872 | if (!entry) | |
2873 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); | |
2874 | ||
2875 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, | |
2876 | NULL, &tracing_iter_fops); | |
2877 | if (!entry) | |
2878 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); | |
2879 | ||
c7078de1 IM |
2880 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
2881 | NULL, &tracing_cpumask_fops); | |
2882 | if (!entry) | |
2883 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); | |
2884 | ||
bc0c38d1 SR |
2885 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
2886 | &global_trace, &tracing_lt_fops); | |
2887 | if (!entry) | |
2888 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); | |
2889 | ||
2890 | entry = debugfs_create_file("trace", 0444, d_tracer, | |
2891 | &global_trace, &tracing_fops); | |
2892 | if (!entry) | |
2893 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2894 | ||
2895 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, | |
2896 | &global_trace, &show_traces_fops); | |
2897 | if (!entry) | |
98a983aa | 2898 | pr_warning("Could not create debugfs 'available_tracers' entry\n"); |
bc0c38d1 SR |
2899 | |
2900 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, | |
2901 | &global_trace, &set_tracer_fops); | |
2902 | if (!entry) | |
98a983aa | 2903 | pr_warning("Could not create debugfs 'current_tracer' entry\n"); |
bc0c38d1 SR |
2904 | |
2905 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, | |
2906 | &tracing_max_latency, | |
2907 | &tracing_max_lat_fops); | |
2908 | if (!entry) | |
2909 | pr_warning("Could not create debugfs " | |
2910 | "'tracing_max_latency' entry\n"); | |
2911 | ||
2912 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, | |
2913 | &tracing_thresh, &tracing_max_lat_fops); | |
2914 | if (!entry) | |
2915 | pr_warning("Could not create debugfs " | |
98a983aa | 2916 | "'tracing_thresh' entry\n"); |
7bd2f24c IM |
2917 | entry = debugfs_create_file("README", 0644, d_tracer, |
2918 | NULL, &tracing_readme_fops); | |
2919 | if (!entry) | |
2920 | pr_warning("Could not create debugfs 'README' entry\n"); | |
2921 | ||
b3806b43 SR |
2922 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
2923 | NULL, &tracing_pipe_fops); | |
2924 | if (!entry) | |
2925 | pr_warning("Could not create debugfs " | |
98a983aa | 2926 | "'trace_pipe' entry\n"); |
bc0c38d1 | 2927 | |
a98a3c3f SR |
2928 | entry = debugfs_create_file("trace_entries", 0644, d_tracer, |
2929 | &global_trace, &tracing_entries_fops); | |
2930 | if (!entry) | |
2931 | pr_warning("Could not create debugfs " | |
98a983aa | 2932 | "'trace_entries' entry\n"); |
a98a3c3f | 2933 | |
5bf9a1ee PP |
2934 | entry = debugfs_create_file("trace_marker", 0220, d_tracer, |
2935 | NULL, &tracing_mark_fops); | |
2936 | if (!entry) | |
2937 | pr_warning("Could not create debugfs " | |
2938 | "'trace_marker' entry\n"); | |
2939 | ||
bc0c38d1 SR |
2940 | #ifdef CONFIG_DYNAMIC_FTRACE |
2941 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, | |
2942 | &ftrace_update_tot_cnt, | |
2943 | &tracing_read_long_fops); | |
2944 | if (!entry) | |
2945 | pr_warning("Could not create debugfs " | |
2946 | "'dyn_ftrace_total_info' entry\n"); | |
2947 | #endif | |
d618b3e6 IM |
2948 | #ifdef CONFIG_SYSPROF_TRACER |
2949 | init_tracer_sysprof_debugfs(d_tracer); | |
2950 | #endif | |
b5ad384e | 2951 | return 0; |
bc0c38d1 SR |
2952 | } |
2953 | ||
801fe400 | 2954 | int trace_vprintk(unsigned long ip, const char *fmt, va_list args) |
dd0e545f | 2955 | { |
dd0e545f SR |
2956 | static DEFINE_SPINLOCK(trace_buf_lock); |
2957 | static char trace_buf[TRACE_BUF_SIZE]; | |
f09ce573 | 2958 | |
3928a8a2 | 2959 | struct ring_buffer_event *event; |
f09ce573 | 2960 | struct trace_array *tr = &global_trace; |
dd0e545f | 2961 | struct trace_array_cpu *data; |
777e208d | 2962 | struct print_entry *entry; |
3928a8a2 | 2963 | unsigned long flags, irq_flags; |
38697053 | 2964 | int cpu, len = 0, size, pc; |
dd0e545f | 2965 | |
43a15386 | 2966 | if (!tr->ctrl || tracing_disabled) |
dd0e545f SR |
2967 | return 0; |
2968 | ||
38697053 SR |
2969 | pc = preempt_count(); |
2970 | preempt_disable_notrace(); | |
dd0e545f SR |
2971 | cpu = raw_smp_processor_id(); |
2972 | data = tr->data[cpu]; | |
dd0e545f | 2973 | |
3ea2e6d7 | 2974 | if (unlikely(atomic_read(&data->disabled))) |
dd0e545f SR |
2975 | goto out; |
2976 | ||
38697053 | 2977 | spin_lock_irqsave(&trace_buf_lock, flags); |
801fe400 | 2978 | len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args); |
dd0e545f SR |
2979 | |
2980 | len = min(len, TRACE_BUF_SIZE-1); | |
2981 | trace_buf[len] = 0; | |
2982 | ||
777e208d SR |
2983 | size = sizeof(*entry) + len + 1; |
2984 | event = ring_buffer_lock_reserve(tr->buffer, size, &irq_flags); | |
3928a8a2 SR |
2985 | if (!event) |
2986 | goto out_unlock; | |
777e208d | 2987 | entry = ring_buffer_event_data(event); |
38697053 | 2988 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
2989 | entry->ent.type = TRACE_PRINT; |
2990 | entry->ip = ip; | |
dd0e545f | 2991 | |
777e208d SR |
2992 | memcpy(&entry->buf, trace_buf, len); |
2993 | entry->buf[len] = 0; | |
3928a8a2 | 2994 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
dd0e545f | 2995 | |
3928a8a2 | 2996 | out_unlock: |
38697053 | 2997 | spin_unlock_irqrestore(&trace_buf_lock, flags); |
dd0e545f SR |
2998 | |
2999 | out: | |
38697053 | 3000 | preempt_enable_notrace(); |
dd0e545f SR |
3001 | |
3002 | return len; | |
3003 | } | |
801fe400 PP |
3004 | EXPORT_SYMBOL_GPL(trace_vprintk); |
3005 | ||
3006 | int __ftrace_printk(unsigned long ip, const char *fmt, ...) | |
3007 | { | |
3008 | int ret; | |
3009 | va_list ap; | |
3010 | ||
3011 | if (!(trace_flags & TRACE_ITER_PRINTK)) | |
3012 | return 0; | |
3013 | ||
3014 | va_start(ap, fmt); | |
3015 | ret = trace_vprintk(ip, fmt, ap); | |
3016 | va_end(ap); | |
3017 | return ret; | |
3018 | } | |
dd0e545f SR |
3019 | EXPORT_SYMBOL_GPL(__ftrace_printk); |
3020 | ||
3f5a54e3 SR |
3021 | static int trace_panic_handler(struct notifier_block *this, |
3022 | unsigned long event, void *unused) | |
3023 | { | |
3024 | ftrace_dump(); | |
3025 | return NOTIFY_OK; | |
3026 | } | |
3027 | ||
3028 | static struct notifier_block trace_panic_notifier = { | |
3029 | .notifier_call = trace_panic_handler, | |
3030 | .next = NULL, | |
3031 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ | |
3032 | }; | |
3033 | ||
3034 | static int trace_die_handler(struct notifier_block *self, | |
3035 | unsigned long val, | |
3036 | void *data) | |
3037 | { | |
3038 | switch (val) { | |
3039 | case DIE_OOPS: | |
3040 | ftrace_dump(); | |
3041 | break; | |
3042 | default: | |
3043 | break; | |
3044 | } | |
3045 | return NOTIFY_OK; | |
3046 | } | |
3047 | ||
3048 | static struct notifier_block trace_die_notifier = { | |
3049 | .notifier_call = trace_die_handler, | |
3050 | .priority = 200 | |
3051 | }; | |
3052 | ||
3053 | /* | |
3054 | * printk is set to max of 1024, we really don't need it that big. | |
3055 | * Nothing should be printing 1000 characters anyway. | |
3056 | */ | |
3057 | #define TRACE_MAX_PRINT 1000 | |
3058 | ||
3059 | /* | |
3060 | * Define here KERN_TRACE so that we have one place to modify | |
3061 | * it if we decide to change what log level the ftrace dump | |
3062 | * should be at. | |
3063 | */ | |
3064 | #define KERN_TRACE KERN_INFO | |
3065 | ||
3066 | static void | |
3067 | trace_printk_seq(struct trace_seq *s) | |
3068 | { | |
3069 | /* Probably should print a warning here. */ | |
3070 | if (s->len >= 1000) | |
3071 | s->len = 1000; | |
3072 | ||
3073 | /* should be zero ended, but we are paranoid. */ | |
3074 | s->buffer[s->len] = 0; | |
3075 | ||
3076 | printk(KERN_TRACE "%s", s->buffer); | |
3077 | ||
3078 | trace_seq_reset(s); | |
3079 | } | |
3080 | ||
3081 | ||
3082 | void ftrace_dump(void) | |
3083 | { | |
3084 | static DEFINE_SPINLOCK(ftrace_dump_lock); | |
3085 | /* use static because iter can be a bit big for the stack */ | |
3086 | static struct trace_iterator iter; | |
3f5a54e3 SR |
3087 | static cpumask_t mask; |
3088 | static int dump_ran; | |
d769041f SR |
3089 | unsigned long flags; |
3090 | int cnt = 0, cpu; | |
3f5a54e3 SR |
3091 | |
3092 | /* only one dump */ | |
3093 | spin_lock_irqsave(&ftrace_dump_lock, flags); | |
3094 | if (dump_ran) | |
3095 | goto out; | |
3096 | ||
3097 | dump_ran = 1; | |
3098 | ||
3099 | /* No turning back! */ | |
3100 | ftrace_kill_atomic(); | |
3101 | ||
d769041f SR |
3102 | for_each_tracing_cpu(cpu) { |
3103 | atomic_inc(&global_trace.data[cpu]->disabled); | |
3104 | } | |
3105 | ||
3f5a54e3 SR |
3106 | printk(KERN_TRACE "Dumping ftrace buffer:\n"); |
3107 | ||
3108 | iter.tr = &global_trace; | |
3109 | iter.trace = current_trace; | |
3110 | ||
3111 | /* | |
3112 | * We need to stop all tracing on all CPUS to read the | |
3113 | * the next buffer. This is a bit expensive, but is | |
3114 | * not done often. We fill all what we can read, | |
3115 | * and then release the locks again. | |
3116 | */ | |
3117 | ||
3118 | cpus_clear(mask); | |
3119 | ||
3f5a54e3 SR |
3120 | while (!trace_empty(&iter)) { |
3121 | ||
3122 | if (!cnt) | |
3123 | printk(KERN_TRACE "---------------------------------\n"); | |
3124 | ||
3125 | cnt++; | |
3126 | ||
3127 | /* reset all but tr, trace, and overruns */ | |
3128 | memset(&iter.seq, 0, | |
3129 | sizeof(struct trace_iterator) - | |
3130 | offsetof(struct trace_iterator, seq)); | |
3131 | iter.iter_flags |= TRACE_FILE_LAT_FMT; | |
3132 | iter.pos = -1; | |
3133 | ||
3134 | if (find_next_entry_inc(&iter) != NULL) { | |
3135 | print_trace_line(&iter); | |
3136 | trace_consume(&iter); | |
3137 | } | |
3138 | ||
3139 | trace_printk_seq(&iter.seq); | |
3140 | } | |
3141 | ||
3142 | if (!cnt) | |
3143 | printk(KERN_TRACE " (ftrace buffer empty)\n"); | |
3144 | else | |
3145 | printk(KERN_TRACE "---------------------------------\n"); | |
3146 | ||
3f5a54e3 SR |
3147 | out: |
3148 | spin_unlock_irqrestore(&ftrace_dump_lock, flags); | |
3149 | } | |
3150 | ||
3928a8a2 | 3151 | __init static int tracer_alloc_buffers(void) |
bc0c38d1 | 3152 | { |
4c11d7ae | 3153 | struct trace_array_cpu *data; |
4c11d7ae SR |
3154 | int i; |
3155 | ||
3928a8a2 SR |
3156 | /* TODO: make the number of buffers hot pluggable with CPUS */ |
3157 | tracing_buffer_mask = cpu_possible_map; | |
4c11d7ae | 3158 | |
3928a8a2 SR |
3159 | global_trace.buffer = ring_buffer_alloc(trace_buf_size, |
3160 | TRACE_BUFFER_FLAGS); | |
3161 | if (!global_trace.buffer) { | |
3162 | printk(KERN_ERR "tracer: failed to allocate ring buffer!\n"); | |
3163 | WARN_ON(1); | |
3164 | return 0; | |
4c11d7ae | 3165 | } |
3928a8a2 | 3166 | global_trace.entries = ring_buffer_size(global_trace.buffer); |
4c11d7ae SR |
3167 | |
3168 | #ifdef CONFIG_TRACER_MAX_TRACE | |
3928a8a2 SR |
3169 | max_tr.buffer = ring_buffer_alloc(trace_buf_size, |
3170 | TRACE_BUFFER_FLAGS); | |
3171 | if (!max_tr.buffer) { | |
3172 | printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n"); | |
3173 | WARN_ON(1); | |
3174 | ring_buffer_free(global_trace.buffer); | |
3175 | return 0; | |
4c11d7ae | 3176 | } |
3928a8a2 SR |
3177 | max_tr.entries = ring_buffer_size(max_tr.buffer); |
3178 | WARN_ON(max_tr.entries != global_trace.entries); | |
a98a3c3f | 3179 | #endif |
ab46428c | 3180 | |
4c11d7ae | 3181 | /* Allocate the first page for all buffers */ |
ab46428c | 3182 | for_each_tracing_cpu(i) { |
4c11d7ae | 3183 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
bc0c38d1 | 3184 | max_tr.data[i] = &per_cpu(max_data, i); |
4c11d7ae | 3185 | } |
bc0c38d1 | 3186 | |
bc0c38d1 SR |
3187 | trace_init_cmdlines(); |
3188 | ||
43a15386 | 3189 | register_tracer(&nop_trace); |
b5ad384e FW |
3190 | #ifdef CONFIG_BOOT_TRACER |
3191 | register_tracer(&boot_tracer); | |
3192 | current_trace = &boot_tracer; | |
3193 | current_trace->init(&global_trace); | |
3194 | #else | |
43a15386 | 3195 | current_trace = &nop_trace; |
b5ad384e | 3196 | #endif |
bc0c38d1 | 3197 | |
60a11774 | 3198 | /* All seems OK, enable tracing */ |
4902f884 | 3199 | global_trace.ctrl = tracer_enabled; |
60a11774 | 3200 | tracing_disabled = 0; |
3928a8a2 | 3201 | |
3f5a54e3 SR |
3202 | atomic_notifier_chain_register(&panic_notifier_list, |
3203 | &trace_panic_notifier); | |
3204 | ||
3205 | register_die_notifier(&trace_die_notifier); | |
3206 | ||
bc0c38d1 | 3207 | return 0; |
bc0c38d1 | 3208 | } |
b5ad384e FW |
3209 | early_initcall(tracer_alloc_buffers); |
3210 | fs_initcall(tracer_init_debugfs); |