Commit | Line | Data |
---|---|---|
bc0c38d1 SR |
1 | /* |
2 | * ring buffer based function tracer | |
3 | * | |
4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> | |
5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> | |
6 | * | |
7 | * Originally taken from the RT patch by: | |
8 | * Arnaldo Carvalho de Melo <acme@redhat.com> | |
9 | * | |
10 | * Based on code from the latency_tracer, that is: | |
11 | * Copyright (C) 2004-2006 Ingo Molnar | |
12 | * Copyright (C) 2004 William Lee Irwin III | |
13 | */ | |
14 | #include <linux/utsrelease.h> | |
15 | #include <linux/kallsyms.h> | |
16 | #include <linux/seq_file.h> | |
3f5a54e3 | 17 | #include <linux/notifier.h> |
bc0c38d1 | 18 | #include <linux/debugfs.h> |
4c11d7ae | 19 | #include <linux/pagemap.h> |
bc0c38d1 SR |
20 | #include <linux/hardirq.h> |
21 | #include <linux/linkage.h> | |
22 | #include <linux/uaccess.h> | |
23 | #include <linux/ftrace.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/percpu.h> | |
3f5a54e3 | 26 | #include <linux/kdebug.h> |
bc0c38d1 SR |
27 | #include <linux/ctype.h> |
28 | #include <linux/init.h> | |
2a2cc8f7 | 29 | #include <linux/poll.h> |
bc0c38d1 SR |
30 | #include <linux/gfp.h> |
31 | #include <linux/fs.h> | |
76094a2c | 32 | #include <linux/kprobes.h> |
3eefae99 | 33 | #include <linux/writeback.h> |
bc0c38d1 | 34 | |
86387f7e | 35 | #include <linux/stacktrace.h> |
3928a8a2 | 36 | #include <linux/ring_buffer.h> |
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 | ||
ab46428c SR |
45 | static cpumask_t __read_mostly tracing_buffer_mask; |
46 | ||
47 | #define for_each_tracing_cpu(cpu) \ | |
48 | for_each_cpu_mask(cpu, tracing_buffer_mask) | |
49 | ||
60a11774 SR |
50 | static int tracing_disabled = 1; |
51 | ||
72829bc3 | 52 | long |
bc0c38d1 SR |
53 | ns2usecs(cycle_t nsec) |
54 | { | |
55 | nsec += 500; | |
56 | do_div(nsec, 1000); | |
57 | return nsec; | |
58 | } | |
59 | ||
e309b41d | 60 | cycle_t ftrace_now(int cpu) |
750ed1a4 | 61 | { |
3928a8a2 SR |
62 | u64 ts = ring_buffer_time_stamp(cpu); |
63 | ring_buffer_normalize_time_stamp(cpu, &ts); | |
64 | return ts; | |
750ed1a4 IM |
65 | } |
66 | ||
4fcdae83 SR |
67 | /* |
68 | * The global_trace is the descriptor that holds the tracing | |
69 | * buffers for the live tracing. For each CPU, it contains | |
70 | * a link list of pages that will store trace entries. The | |
71 | * page descriptor of the pages in the memory is used to hold | |
72 | * the link list by linking the lru item in the page descriptor | |
73 | * to each of the pages in the buffer per CPU. | |
74 | * | |
75 | * For each active CPU there is a data field that holds the | |
76 | * pages for the buffer for that CPU. Each CPU has the same number | |
77 | * of pages allocated for its buffer. | |
78 | */ | |
bc0c38d1 SR |
79 | static struct trace_array global_trace; |
80 | ||
81 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); | |
82 | ||
4fcdae83 SR |
83 | /* |
84 | * The max_tr is used to snapshot the global_trace when a maximum | |
85 | * latency is reached. Some tracers will use this to store a maximum | |
86 | * trace while it continues examining live traces. | |
87 | * | |
88 | * The buffers for the max_tr are set up the same as the global_trace. | |
89 | * When a snapshot is taken, the link list of the max_tr is swapped | |
90 | * with the link list of the global_trace and the buffers are reset for | |
91 | * the global_trace so the tracing can continue. | |
92 | */ | |
bc0c38d1 SR |
93 | static struct trace_array max_tr; |
94 | ||
95 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); | |
96 | ||
4fcdae83 | 97 | /* tracer_enabled is used to toggle activation of a tracer */ |
26994ead | 98 | static int tracer_enabled = 1; |
4fcdae83 | 99 | |
60bc0800 SR |
100 | /* function tracing enabled */ |
101 | int ftrace_function_enabled; | |
102 | ||
4fcdae83 | 103 | /* |
3928a8a2 SR |
104 | * trace_buf_size is the size in bytes that is allocated |
105 | * for a buffer. Note, the number of bytes is always rounded | |
106 | * to page size. | |
3f5a54e3 SR |
107 | * |
108 | * This number is purposely set to a low number of 16384. | |
109 | * If the dump on oops happens, it will be much appreciated | |
110 | * to not have to wait for all that output. Anyway this can be | |
111 | * boot time and run time configurable. | |
4fcdae83 | 112 | */ |
3928a8a2 | 113 | #define TRACE_BUF_SIZE_DEFAULT 1441792UL /* 16384 * 88 (sizeof(entry)) */ |
3f5a54e3 | 114 | |
3928a8a2 | 115 | static unsigned long trace_buf_size = TRACE_BUF_SIZE_DEFAULT; |
bc0c38d1 | 116 | |
4fcdae83 | 117 | /* trace_types holds a link list of available tracers. */ |
bc0c38d1 | 118 | static struct tracer *trace_types __read_mostly; |
4fcdae83 SR |
119 | |
120 | /* current_trace points to the tracer that is currently active */ | |
bc0c38d1 | 121 | static struct tracer *current_trace __read_mostly; |
4fcdae83 SR |
122 | |
123 | /* | |
124 | * max_tracer_type_len is used to simplify the allocating of | |
125 | * buffers to read userspace tracer names. We keep track of | |
126 | * the longest tracer name registered. | |
127 | */ | |
bc0c38d1 SR |
128 | static int max_tracer_type_len; |
129 | ||
4fcdae83 SR |
130 | /* |
131 | * trace_types_lock is used to protect the trace_types list. | |
132 | * This lock is also used to keep user access serialized. | |
133 | * Accesses from userspace will grab this lock while userspace | |
134 | * activities happen inside the kernel. | |
135 | */ | |
bc0c38d1 | 136 | static DEFINE_MUTEX(trace_types_lock); |
4fcdae83 SR |
137 | |
138 | /* trace_wait is a waitqueue for tasks blocked on trace_poll */ | |
4e655519 IM |
139 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
140 | ||
4fcdae83 | 141 | /* trace_flags holds iter_ctrl options */ |
4e655519 IM |
142 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT; |
143 | ||
4fcdae83 SR |
144 | /** |
145 | * trace_wake_up - wake up tasks waiting for trace input | |
146 | * | |
147 | * Simply wakes up any task that is blocked on the trace_wait | |
148 | * queue. These is used with trace_poll for tasks polling the trace. | |
149 | */ | |
4e655519 IM |
150 | void trace_wake_up(void) |
151 | { | |
017730c1 IM |
152 | /* |
153 | * The runqueue_is_locked() can fail, but this is the best we | |
154 | * have for now: | |
155 | */ | |
156 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) | |
4e655519 IM |
157 | wake_up(&trace_wait); |
158 | } | |
bc0c38d1 | 159 | |
3928a8a2 | 160 | static int __init set_buf_size(char *str) |
bc0c38d1 | 161 | { |
3928a8a2 | 162 | unsigned long buf_size; |
c6caeeb1 SR |
163 | int ret; |
164 | ||
bc0c38d1 SR |
165 | if (!str) |
166 | return 0; | |
3928a8a2 | 167 | ret = strict_strtoul(str, 0, &buf_size); |
c6caeeb1 | 168 | /* nr_entries can not be zero */ |
3928a8a2 | 169 | if (ret < 0 || buf_size == 0) |
c6caeeb1 | 170 | return 0; |
3928a8a2 | 171 | trace_buf_size = buf_size; |
bc0c38d1 SR |
172 | return 1; |
173 | } | |
3928a8a2 | 174 | __setup("trace_buf_size=", set_buf_size); |
bc0c38d1 | 175 | |
57f50be1 SR |
176 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
177 | { | |
178 | return nsecs / 1000; | |
179 | } | |
180 | ||
4fcdae83 SR |
181 | /* |
182 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that | |
183 | * control the output of kernel symbols. | |
184 | */ | |
bc0c38d1 SR |
185 | #define TRACE_ITER_SYM_MASK \ |
186 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) | |
187 | ||
4fcdae83 | 188 | /* These must match the bit postions in trace_iterator_flags */ |
bc0c38d1 SR |
189 | static const char *trace_options[] = { |
190 | "print-parent", | |
191 | "sym-offset", | |
192 | "sym-addr", | |
193 | "verbose", | |
f9896bf3 | 194 | "raw", |
5e3ca0ec | 195 | "hex", |
cb0f12aa | 196 | "bin", |
2a2cc8f7 | 197 | "block", |
86387f7e | 198 | "stacktrace", |
4ac3ba41 | 199 | "sched-tree", |
f09ce573 | 200 | "ftrace_printk", |
bc0c38d1 SR |
201 | NULL |
202 | }; | |
203 | ||
4fcdae83 SR |
204 | /* |
205 | * ftrace_max_lock is used to protect the swapping of buffers | |
206 | * when taking a max snapshot. The buffers themselves are | |
207 | * protected by per_cpu spinlocks. But the action of the swap | |
208 | * needs its own lock. | |
209 | * | |
210 | * This is defined as a raw_spinlock_t in order to help | |
211 | * with performance when lockdep debugging is enabled. | |
212 | */ | |
92205c23 SR |
213 | static raw_spinlock_t ftrace_max_lock = |
214 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; | |
bc0c38d1 SR |
215 | |
216 | /* | |
217 | * Copy the new maximum trace into the separate maximum-trace | |
218 | * structure. (this way the maximum trace is permanently saved, | |
219 | * for later retrieval via /debugfs/tracing/latency_trace) | |
220 | */ | |
e309b41d | 221 | static void |
bc0c38d1 SR |
222 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
223 | { | |
224 | struct trace_array_cpu *data = tr->data[cpu]; | |
225 | ||
226 | max_tr.cpu = cpu; | |
227 | max_tr.time_start = data->preempt_timestamp; | |
228 | ||
229 | data = max_tr.data[cpu]; | |
230 | data->saved_latency = tracing_max_latency; | |
231 | ||
232 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); | |
233 | data->pid = tsk->pid; | |
234 | data->uid = tsk->uid; | |
235 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; | |
236 | data->policy = tsk->policy; | |
237 | data->rt_priority = tsk->rt_priority; | |
238 | ||
239 | /* record this tasks comm */ | |
240 | tracing_record_cmdline(current); | |
241 | } | |
242 | ||
4fcdae83 SR |
243 | /** |
244 | * trace_seq_printf - sequence printing of trace information | |
245 | * @s: trace sequence descriptor | |
246 | * @fmt: printf format string | |
247 | * | |
248 | * The tracer may use either sequence operations or its own | |
249 | * copy to user routines. To simplify formating of a trace | |
250 | * trace_seq_printf is used to store strings into a special | |
251 | * buffer (@s). Then the output may be either used by | |
252 | * the sequencer or pulled into another buffer. | |
253 | */ | |
72829bc3 | 254 | int |
214023c3 SR |
255 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
256 | { | |
257 | int len = (PAGE_SIZE - 1) - s->len; | |
258 | va_list ap; | |
b3806b43 | 259 | int ret; |
214023c3 SR |
260 | |
261 | if (!len) | |
262 | return 0; | |
263 | ||
264 | va_start(ap, fmt); | |
b3806b43 | 265 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
214023c3 SR |
266 | va_end(ap); |
267 | ||
b3806b43 | 268 | /* If we can't write it all, don't bother writing anything */ |
72829bc3 | 269 | if (ret >= len) |
b3806b43 SR |
270 | return 0; |
271 | ||
272 | s->len += ret; | |
214023c3 SR |
273 | |
274 | return len; | |
275 | } | |
276 | ||
4fcdae83 SR |
277 | /** |
278 | * trace_seq_puts - trace sequence printing of simple string | |
279 | * @s: trace sequence descriptor | |
280 | * @str: simple string to record | |
281 | * | |
282 | * The tracer may use either the sequence operations or its own | |
283 | * copy to user routines. This function records a simple string | |
284 | * into a special buffer (@s) for later retrieval by a sequencer | |
285 | * or other mechanism. | |
286 | */ | |
e309b41d | 287 | static int |
214023c3 SR |
288 | trace_seq_puts(struct trace_seq *s, const char *str) |
289 | { | |
290 | int len = strlen(str); | |
291 | ||
292 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
b3806b43 | 293 | return 0; |
214023c3 SR |
294 | |
295 | memcpy(s->buffer + s->len, str, len); | |
296 | s->len += len; | |
297 | ||
298 | return len; | |
299 | } | |
300 | ||
e309b41d | 301 | static int |
214023c3 SR |
302 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
303 | { | |
304 | if (s->len >= (PAGE_SIZE - 1)) | |
305 | return 0; | |
306 | ||
307 | s->buffer[s->len++] = c; | |
308 | ||
309 | return 1; | |
310 | } | |
311 | ||
e309b41d | 312 | static int |
cb0f12aa IM |
313 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
314 | { | |
315 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
316 | return 0; | |
317 | ||
318 | memcpy(s->buffer + s->len, mem, len); | |
319 | s->len += len; | |
320 | ||
321 | return len; | |
322 | } | |
323 | ||
5e3ca0ec | 324 | #define HEX_CHARS 17 |
93dcc6ea | 325 | static const char hex2asc[] = "0123456789abcdef"; |
5e3ca0ec | 326 | |
e309b41d | 327 | static int |
5e3ca0ec IM |
328 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
329 | { | |
330 | unsigned char hex[HEX_CHARS]; | |
93dcc6ea | 331 | unsigned char *data = mem; |
5e3ca0ec IM |
332 | unsigned char byte; |
333 | int i, j; | |
334 | ||
335 | BUG_ON(len >= HEX_CHARS); | |
336 | ||
5e3ca0ec IM |
337 | #ifdef __BIG_ENDIAN |
338 | for (i = 0, j = 0; i < len; i++) { | |
339 | #else | |
340 | for (i = len-1, j = 0; i >= 0; i--) { | |
341 | #endif | |
342 | byte = data[i]; | |
343 | ||
93dcc6ea TG |
344 | hex[j++] = hex2asc[byte & 0x0f]; |
345 | hex[j++] = hex2asc[byte >> 4]; | |
5e3ca0ec | 346 | } |
93dcc6ea | 347 | hex[j++] = ' '; |
5e3ca0ec IM |
348 | |
349 | return trace_seq_putmem(s, hex, j); | |
350 | } | |
351 | ||
e309b41d | 352 | static void |
214023c3 SR |
353 | trace_seq_reset(struct trace_seq *s) |
354 | { | |
355 | s->len = 0; | |
6c6c2796 PP |
356 | s->readpos = 0; |
357 | } | |
358 | ||
359 | ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) | |
360 | { | |
361 | int len; | |
362 | int ret; | |
363 | ||
364 | if (s->len <= s->readpos) | |
365 | return -EBUSY; | |
366 | ||
367 | len = s->len - s->readpos; | |
368 | if (cnt > len) | |
369 | cnt = len; | |
370 | ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); | |
371 | if (ret) | |
372 | return -EFAULT; | |
373 | ||
374 | s->readpos += len; | |
375 | return cnt; | |
214023c3 SR |
376 | } |
377 | ||
e309b41d | 378 | static void |
214023c3 SR |
379 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
380 | { | |
381 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; | |
382 | ||
383 | s->buffer[len] = 0; | |
384 | seq_puts(m, s->buffer); | |
385 | ||
386 | trace_seq_reset(s); | |
387 | } | |
388 | ||
4fcdae83 SR |
389 | /** |
390 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr | |
391 | * @tr: tracer | |
392 | * @tsk: the task with the latency | |
393 | * @cpu: The cpu that initiated the trace. | |
394 | * | |
395 | * Flip the buffers between the @tr and the max_tr and record information | |
396 | * about which task was the cause of this latency. | |
397 | */ | |
e309b41d | 398 | void |
bc0c38d1 SR |
399 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
400 | { | |
3928a8a2 | 401 | struct ring_buffer *buf = tr->buffer; |
bc0c38d1 | 402 | |
4c11d7ae | 403 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 404 | __raw_spin_lock(&ftrace_max_lock); |
3928a8a2 SR |
405 | |
406 | tr->buffer = max_tr.buffer; | |
407 | max_tr.buffer = buf; | |
408 | ||
409 | ring_buffer_reset(tr->buffer); | |
bc0c38d1 SR |
410 | |
411 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 412 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
413 | } |
414 | ||
415 | /** | |
416 | * update_max_tr_single - only copy one trace over, and reset the rest | |
417 | * @tr - tracer | |
418 | * @tsk - task with the latency | |
419 | * @cpu - the cpu of the buffer to copy. | |
4fcdae83 SR |
420 | * |
421 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. | |
bc0c38d1 | 422 | */ |
e309b41d | 423 | void |
bc0c38d1 SR |
424 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
425 | { | |
3928a8a2 | 426 | int ret; |
bc0c38d1 | 427 | |
4c11d7ae | 428 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 429 | __raw_spin_lock(&ftrace_max_lock); |
bc0c38d1 | 430 | |
3928a8a2 SR |
431 | ring_buffer_reset(max_tr.buffer); |
432 | ret = ring_buffer_swap_cpu(max_tr.buffer, tr->buffer, cpu); | |
433 | ||
434 | WARN_ON_ONCE(ret); | |
bc0c38d1 SR |
435 | |
436 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 437 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
438 | } |
439 | ||
4fcdae83 SR |
440 | /** |
441 | * register_tracer - register a tracer with the ftrace system. | |
442 | * @type - the plugin for the tracer | |
443 | * | |
444 | * Register a new plugin tracer. | |
445 | */ | |
bc0c38d1 SR |
446 | int register_tracer(struct tracer *type) |
447 | { | |
448 | struct tracer *t; | |
449 | int len; | |
450 | int ret = 0; | |
451 | ||
452 | if (!type->name) { | |
453 | pr_info("Tracer must have a name\n"); | |
454 | return -1; | |
455 | } | |
456 | ||
457 | mutex_lock(&trace_types_lock); | |
458 | for (t = trace_types; t; t = t->next) { | |
459 | if (strcmp(type->name, t->name) == 0) { | |
460 | /* already found */ | |
461 | pr_info("Trace %s already registered\n", | |
462 | type->name); | |
463 | ret = -1; | |
464 | goto out; | |
465 | } | |
466 | } | |
467 | ||
60a11774 SR |
468 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
469 | if (type->selftest) { | |
470 | struct tracer *saved_tracer = current_trace; | |
60a11774 SR |
471 | struct trace_array *tr = &global_trace; |
472 | int saved_ctrl = tr->ctrl; | |
473 | int i; | |
474 | /* | |
475 | * Run a selftest on this tracer. | |
476 | * Here we reset the trace buffer, and set the current | |
477 | * tracer to be this tracer. The tracer can then run some | |
478 | * internal tracing to verify that everything is in order. | |
479 | * If we fail, we do not register this tracer. | |
480 | */ | |
ab46428c | 481 | for_each_tracing_cpu(i) { |
3928a8a2 | 482 | tracing_reset(tr, i); |
60a11774 SR |
483 | } |
484 | current_trace = type; | |
485 | tr->ctrl = 0; | |
486 | /* the test is responsible for initializing and enabling */ | |
487 | pr_info("Testing tracer %s: ", type->name); | |
488 | ret = type->selftest(type, tr); | |
489 | /* the test is responsible for resetting too */ | |
490 | current_trace = saved_tracer; | |
491 | tr->ctrl = saved_ctrl; | |
492 | if (ret) { | |
493 | printk(KERN_CONT "FAILED!\n"); | |
494 | goto out; | |
495 | } | |
1d4db00a | 496 | /* Only reset on passing, to avoid touching corrupted buffers */ |
ab46428c | 497 | for_each_tracing_cpu(i) { |
3928a8a2 | 498 | tracing_reset(tr, i); |
1d4db00a | 499 | } |
60a11774 SR |
500 | printk(KERN_CONT "PASSED\n"); |
501 | } | |
502 | #endif | |
503 | ||
bc0c38d1 SR |
504 | type->next = trace_types; |
505 | trace_types = type; | |
506 | len = strlen(type->name); | |
507 | if (len > max_tracer_type_len) | |
508 | max_tracer_type_len = len; | |
60a11774 | 509 | |
bc0c38d1 SR |
510 | out: |
511 | mutex_unlock(&trace_types_lock); | |
512 | ||
513 | return ret; | |
514 | } | |
515 | ||
516 | void unregister_tracer(struct tracer *type) | |
517 | { | |
518 | struct tracer **t; | |
519 | int len; | |
520 | ||
521 | mutex_lock(&trace_types_lock); | |
522 | for (t = &trace_types; *t; t = &(*t)->next) { | |
523 | if (*t == type) | |
524 | goto found; | |
525 | } | |
526 | pr_info("Trace %s not registered\n", type->name); | |
527 | goto out; | |
528 | ||
529 | found: | |
530 | *t = (*t)->next; | |
531 | if (strlen(type->name) != max_tracer_type_len) | |
532 | goto out; | |
533 | ||
534 | max_tracer_type_len = 0; | |
535 | for (t = &trace_types; *t; t = &(*t)->next) { | |
536 | len = strlen((*t)->name); | |
537 | if (len > max_tracer_type_len) | |
538 | max_tracer_type_len = len; | |
539 | } | |
540 | out: | |
541 | mutex_unlock(&trace_types_lock); | |
542 | } | |
543 | ||
3928a8a2 | 544 | void tracing_reset(struct trace_array *tr, int cpu) |
bc0c38d1 | 545 | { |
3928a8a2 | 546 | ring_buffer_reset_cpu(tr->buffer, cpu); |
bc0c38d1 SR |
547 | } |
548 | ||
bc0c38d1 SR |
549 | #define SAVED_CMDLINES 128 |
550 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; | |
551 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; | |
552 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; | |
553 | static int cmdline_idx; | |
554 | static DEFINE_SPINLOCK(trace_cmdline_lock); | |
25b0b44a | 555 | |
25b0b44a SR |
556 | /* temporary disable recording */ |
557 | atomic_t trace_record_cmdline_disabled __read_mostly; | |
bc0c38d1 SR |
558 | |
559 | static void trace_init_cmdlines(void) | |
560 | { | |
561 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); | |
562 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); | |
563 | cmdline_idx = 0; | |
564 | } | |
565 | ||
e309b41d | 566 | void trace_stop_cmdline_recording(void); |
bc0c38d1 | 567 | |
e309b41d | 568 | static void trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
569 | { |
570 | unsigned map; | |
571 | unsigned idx; | |
572 | ||
573 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
574 | return; | |
575 | ||
576 | /* | |
577 | * It's not the end of the world if we don't get | |
578 | * the lock, but we also don't want to spin | |
579 | * nor do we want to disable interrupts, | |
580 | * so if we miss here, then better luck next time. | |
581 | */ | |
582 | if (!spin_trylock(&trace_cmdline_lock)) | |
583 | return; | |
584 | ||
585 | idx = map_pid_to_cmdline[tsk->pid]; | |
586 | if (idx >= SAVED_CMDLINES) { | |
587 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; | |
588 | ||
589 | map = map_cmdline_to_pid[idx]; | |
590 | if (map <= PID_MAX_DEFAULT) | |
591 | map_pid_to_cmdline[map] = (unsigned)-1; | |
592 | ||
593 | map_pid_to_cmdline[tsk->pid] = idx; | |
594 | ||
595 | cmdline_idx = idx; | |
596 | } | |
597 | ||
598 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); | |
599 | ||
600 | spin_unlock(&trace_cmdline_lock); | |
601 | } | |
602 | ||
e309b41d | 603 | static char *trace_find_cmdline(int pid) |
bc0c38d1 SR |
604 | { |
605 | char *cmdline = "<...>"; | |
606 | unsigned map; | |
607 | ||
608 | if (!pid) | |
609 | return "<idle>"; | |
610 | ||
611 | if (pid > PID_MAX_DEFAULT) | |
612 | goto out; | |
613 | ||
614 | map = map_pid_to_cmdline[pid]; | |
615 | if (map >= SAVED_CMDLINES) | |
616 | goto out; | |
617 | ||
618 | cmdline = saved_cmdlines[map]; | |
619 | ||
620 | out: | |
621 | return cmdline; | |
622 | } | |
623 | ||
e309b41d | 624 | void tracing_record_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
625 | { |
626 | if (atomic_read(&trace_record_cmdline_disabled)) | |
627 | return; | |
628 | ||
629 | trace_save_cmdline(tsk); | |
630 | } | |
631 | ||
45dcd8b8 | 632 | void |
c7aafc54 | 633 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags) |
bc0c38d1 SR |
634 | { |
635 | struct task_struct *tsk = current; | |
636 | unsigned long pc; | |
637 | ||
638 | pc = preempt_count(); | |
639 | ||
777e208d SR |
640 | entry->preempt_count = pc & 0xff; |
641 | entry->pid = (tsk) ? tsk->pid : 0; | |
642 | entry->flags = | |
2e2ca155 | 643 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
bc0c38d1 SR |
644 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
645 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | | |
646 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); | |
647 | } | |
648 | ||
e309b41d | 649 | void |
6fb44b71 SR |
650 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
651 | unsigned long ip, unsigned long parent_ip, unsigned long flags) | |
bc0c38d1 | 652 | { |
3928a8a2 | 653 | struct ring_buffer_event *event; |
777e208d | 654 | struct ftrace_entry *entry; |
dcb6308f | 655 | unsigned long irq_flags; |
bc0c38d1 | 656 | |
3928a8a2 SR |
657 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
658 | &irq_flags); | |
659 | if (!event) | |
660 | return; | |
661 | entry = ring_buffer_event_data(event); | |
777e208d SR |
662 | tracing_generic_entry_update(&entry->ent, flags); |
663 | entry->ent.type = TRACE_FN; | |
664 | entry->ip = ip; | |
665 | entry->parent_ip = parent_ip; | |
3928a8a2 | 666 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
bc0c38d1 SR |
667 | } |
668 | ||
e309b41d | 669 | void |
2e0f5761 IM |
670 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
671 | unsigned long ip, unsigned long parent_ip, unsigned long flags) | |
672 | { | |
673 | if (likely(!atomic_read(&data->disabled))) | |
6fb44b71 | 674 | trace_function(tr, data, ip, parent_ip, flags); |
2e0f5761 IM |
675 | } |
676 | ||
86387f7e IM |
677 | void __trace_stack(struct trace_array *tr, |
678 | struct trace_array_cpu *data, | |
679 | unsigned long flags, | |
680 | int skip) | |
681 | { | |
3928a8a2 | 682 | struct ring_buffer_event *event; |
777e208d | 683 | struct stack_entry *entry; |
86387f7e | 684 | struct stack_trace trace; |
3928a8a2 | 685 | unsigned long irq_flags; |
86387f7e IM |
686 | |
687 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) | |
688 | return; | |
689 | ||
3928a8a2 SR |
690 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
691 | &irq_flags); | |
692 | if (!event) | |
693 | return; | |
694 | entry = ring_buffer_event_data(event); | |
777e208d SR |
695 | tracing_generic_entry_update(&entry->ent, flags); |
696 | entry->ent.type = TRACE_STACK; | |
86387f7e | 697 | |
777e208d | 698 | memset(&entry->caller, 0, sizeof(entry->caller)); |
86387f7e IM |
699 | |
700 | trace.nr_entries = 0; | |
701 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
702 | trace.skip = skip; | |
777e208d | 703 | trace.entries = entry->caller; |
86387f7e IM |
704 | |
705 | save_stack_trace(&trace); | |
3928a8a2 | 706 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
f0a920d5 IM |
707 | } |
708 | ||
a4feb834 IM |
709 | void |
710 | __trace_special(void *__tr, void *__data, | |
711 | unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
712 | { | |
3928a8a2 | 713 | struct ring_buffer_event *event; |
a4feb834 IM |
714 | struct trace_array_cpu *data = __data; |
715 | struct trace_array *tr = __tr; | |
777e208d | 716 | struct special_entry *entry; |
a4feb834 IM |
717 | unsigned long irq_flags; |
718 | ||
3928a8a2 SR |
719 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
720 | &irq_flags); | |
721 | if (!event) | |
722 | return; | |
723 | entry = ring_buffer_event_data(event); | |
777e208d SR |
724 | tracing_generic_entry_update(&entry->ent, 0); |
725 | entry->ent.type = TRACE_SPECIAL; | |
726 | entry->arg1 = arg1; | |
727 | entry->arg2 = arg2; | |
728 | entry->arg3 = arg3; | |
3928a8a2 | 729 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
a4feb834 | 730 | __trace_stack(tr, data, irq_flags, 4); |
a4feb834 IM |
731 | |
732 | trace_wake_up(); | |
733 | } | |
734 | ||
e309b41d | 735 | void |
bc0c38d1 SR |
736 | tracing_sched_switch_trace(struct trace_array *tr, |
737 | struct trace_array_cpu *data, | |
86387f7e IM |
738 | struct task_struct *prev, |
739 | struct task_struct *next, | |
bc0c38d1 SR |
740 | unsigned long flags) |
741 | { | |
3928a8a2 | 742 | struct ring_buffer_event *event; |
777e208d | 743 | struct ctx_switch_entry *entry; |
dcb6308f | 744 | unsigned long irq_flags; |
bc0c38d1 | 745 | |
3928a8a2 SR |
746 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
747 | &irq_flags); | |
748 | if (!event) | |
749 | return; | |
750 | entry = ring_buffer_event_data(event); | |
777e208d SR |
751 | tracing_generic_entry_update(&entry->ent, flags); |
752 | entry->ent.type = TRACE_CTX; | |
753 | entry->prev_pid = prev->pid; | |
754 | entry->prev_prio = prev->prio; | |
755 | entry->prev_state = prev->state; | |
756 | entry->next_pid = next->pid; | |
757 | entry->next_prio = next->prio; | |
758 | entry->next_state = next->state; | |
759 | entry->next_cpu = task_cpu(next); | |
3928a8a2 | 760 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
74f4e369 | 761 | __trace_stack(tr, data, flags, 5); |
bc0c38d1 SR |
762 | } |
763 | ||
57422797 IM |
764 | void |
765 | tracing_sched_wakeup_trace(struct trace_array *tr, | |
766 | struct trace_array_cpu *data, | |
86387f7e IM |
767 | struct task_struct *wakee, |
768 | struct task_struct *curr, | |
57422797 IM |
769 | unsigned long flags) |
770 | { | |
3928a8a2 | 771 | struct ring_buffer_event *event; |
777e208d | 772 | struct ctx_switch_entry *entry; |
57422797 IM |
773 | unsigned long irq_flags; |
774 | ||
3928a8a2 SR |
775 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
776 | &irq_flags); | |
777 | if (!event) | |
778 | return; | |
779 | entry = ring_buffer_event_data(event); | |
777e208d SR |
780 | tracing_generic_entry_update(&entry->ent, flags); |
781 | entry->ent.type = TRACE_WAKE; | |
782 | entry->prev_pid = curr->pid; | |
783 | entry->prev_prio = curr->prio; | |
784 | entry->prev_state = curr->state; | |
785 | entry->next_pid = wakee->pid; | |
786 | entry->next_prio = wakee->prio; | |
787 | entry->next_state = wakee->state; | |
788 | entry->next_cpu = task_cpu(wakee); | |
3928a8a2 | 789 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
74f4e369 | 790 | __trace_stack(tr, data, flags, 6); |
017730c1 IM |
791 | |
792 | trace_wake_up(); | |
57422797 IM |
793 | } |
794 | ||
4902f884 SR |
795 | void |
796 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
797 | { | |
798 | struct trace_array *tr = &global_trace; | |
799 | struct trace_array_cpu *data; | |
800 | unsigned long flags; | |
801 | long disabled; | |
802 | int cpu; | |
803 | ||
43a15386 | 804 | if (tracing_disabled || !tr->ctrl) |
4902f884 SR |
805 | return; |
806 | ||
807 | local_irq_save(flags); | |
808 | cpu = raw_smp_processor_id(); | |
809 | data = tr->data[cpu]; | |
810 | disabled = atomic_inc_return(&data->disabled); | |
811 | ||
812 | if (likely(disabled == 1)) | |
813 | __trace_special(tr, data, arg1, arg2, arg3); | |
814 | ||
815 | atomic_dec(&data->disabled); | |
816 | local_irq_restore(flags); | |
817 | } | |
818 | ||
2e0f5761 | 819 | #ifdef CONFIG_FTRACE |
e309b41d | 820 | static void |
2e0f5761 IM |
821 | function_trace_call(unsigned long ip, unsigned long parent_ip) |
822 | { | |
823 | struct trace_array *tr = &global_trace; | |
824 | struct trace_array_cpu *data; | |
825 | unsigned long flags; | |
826 | long disabled; | |
827 | int cpu; | |
828 | ||
60bc0800 | 829 | if (unlikely(!ftrace_function_enabled)) |
2e0f5761 IM |
830 | return; |
831 | ||
ecea656d AS |
832 | if (skip_trace(ip)) |
833 | return; | |
834 | ||
2e0f5761 IM |
835 | local_irq_save(flags); |
836 | cpu = raw_smp_processor_id(); | |
837 | data = tr->data[cpu]; | |
838 | disabled = atomic_inc_return(&data->disabled); | |
839 | ||
840 | if (likely(disabled == 1)) | |
6fb44b71 | 841 | trace_function(tr, data, ip, parent_ip, flags); |
2e0f5761 IM |
842 | |
843 | atomic_dec(&data->disabled); | |
844 | local_irq_restore(flags); | |
845 | } | |
846 | ||
847 | static struct ftrace_ops trace_ops __read_mostly = | |
848 | { | |
849 | .func = function_trace_call, | |
850 | }; | |
851 | ||
e309b41d | 852 | void tracing_start_function_trace(void) |
2e0f5761 | 853 | { |
60bc0800 | 854 | ftrace_function_enabled = 0; |
2e0f5761 | 855 | register_ftrace_function(&trace_ops); |
60bc0800 SR |
856 | if (tracer_enabled) |
857 | ftrace_function_enabled = 1; | |
2e0f5761 IM |
858 | } |
859 | ||
e309b41d | 860 | void tracing_stop_function_trace(void) |
2e0f5761 | 861 | { |
60bc0800 | 862 | ftrace_function_enabled = 0; |
2e0f5761 IM |
863 | unregister_ftrace_function(&trace_ops); |
864 | } | |
865 | #endif | |
866 | ||
bc0c38d1 SR |
867 | enum trace_file_type { |
868 | TRACE_FILE_LAT_FMT = 1, | |
869 | }; | |
870 | ||
5a90f577 SR |
871 | static void trace_iterator_increment(struct trace_iterator *iter, int cpu) |
872 | { | |
873 | iter->idx++; | |
3928a8a2 | 874 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); |
5a90f577 SR |
875 | } |
876 | ||
e309b41d | 877 | static struct trace_entry * |
3928a8a2 | 878 | peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts) |
dd0e545f | 879 | { |
3928a8a2 SR |
880 | struct ring_buffer_event *event; |
881 | struct ring_buffer_iter *buf_iter = iter->buffer_iter[cpu]; | |
dd0e545f | 882 | |
3928a8a2 SR |
883 | event = ring_buffer_iter_peek(buf_iter, ts); |
884 | return event ? ring_buffer_event_data(event) : NULL; | |
dd0e545f | 885 | } |
dd0e545f | 886 | static struct trace_entry * |
3928a8a2 | 887 | __find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
bc0c38d1 | 888 | { |
3928a8a2 | 889 | struct ring_buffer *buffer = iter->tr->buffer; |
bc0c38d1 | 890 | struct trace_entry *ent, *next = NULL; |
3928a8a2 | 891 | u64 next_ts = 0, ts; |
bc0c38d1 SR |
892 | int next_cpu = -1; |
893 | int cpu; | |
894 | ||
ab46428c | 895 | for_each_tracing_cpu(cpu) { |
dd0e545f | 896 | |
3928a8a2 SR |
897 | if (ring_buffer_empty_cpu(buffer, cpu)) |
898 | continue; | |
dd0e545f | 899 | |
3928a8a2 | 900 | ent = peek_next_entry(iter, cpu, &ts); |
dd0e545f | 901 | |
cdd31cd2 IM |
902 | /* |
903 | * Pick the entry with the smallest timestamp: | |
904 | */ | |
3928a8a2 | 905 | if (ent && (!next || ts < next_ts)) { |
bc0c38d1 SR |
906 | next = ent; |
907 | next_cpu = cpu; | |
3928a8a2 | 908 | next_ts = ts; |
bc0c38d1 SR |
909 | } |
910 | } | |
911 | ||
912 | if (ent_cpu) | |
913 | *ent_cpu = next_cpu; | |
914 | ||
3928a8a2 SR |
915 | if (ent_ts) |
916 | *ent_ts = next_ts; | |
917 | ||
bc0c38d1 SR |
918 | return next; |
919 | } | |
920 | ||
dd0e545f SR |
921 | /* Find the next real entry, without updating the iterator itself */ |
922 | static struct trace_entry * | |
3928a8a2 | 923 | find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
bc0c38d1 | 924 | { |
3928a8a2 | 925 | return __find_next_entry(iter, ent_cpu, ent_ts); |
dd0e545f SR |
926 | } |
927 | ||
928 | /* Find the next real entry, and increment the iterator to the next entry */ | |
929 | static void *find_next_entry_inc(struct trace_iterator *iter) | |
930 | { | |
3928a8a2 | 931 | iter->ent = __find_next_entry(iter, &iter->cpu, &iter->ts); |
dd0e545f | 932 | |
3928a8a2 | 933 | if (iter->ent) |
dd0e545f SR |
934 | trace_iterator_increment(iter, iter->cpu); |
935 | ||
3928a8a2 | 936 | return iter->ent ? iter : NULL; |
b3806b43 | 937 | } |
bc0c38d1 | 938 | |
e309b41d | 939 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 | 940 | { |
3928a8a2 | 941 | ring_buffer_consume(iter->tr->buffer, iter->cpu, &iter->ts); |
bc0c38d1 SR |
942 | } |
943 | ||
e309b41d | 944 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
945 | { |
946 | struct trace_iterator *iter = m->private; | |
bc0c38d1 | 947 | int i = (int)*pos; |
4e3c3333 | 948 | void *ent; |
bc0c38d1 SR |
949 | |
950 | (*pos)++; | |
951 | ||
952 | /* can't go backwards */ | |
953 | if (iter->idx > i) | |
954 | return NULL; | |
955 | ||
956 | if (iter->idx < 0) | |
957 | ent = find_next_entry_inc(iter); | |
958 | else | |
959 | ent = iter; | |
960 | ||
961 | while (ent && iter->idx < i) | |
962 | ent = find_next_entry_inc(iter); | |
963 | ||
964 | iter->pos = *pos; | |
965 | ||
bc0c38d1 SR |
966 | return ent; |
967 | } | |
968 | ||
969 | static void *s_start(struct seq_file *m, loff_t *pos) | |
970 | { | |
971 | struct trace_iterator *iter = m->private; | |
972 | void *p = NULL; | |
973 | loff_t l = 0; | |
3928a8a2 | 974 | int cpu; |
bc0c38d1 SR |
975 | |
976 | mutex_lock(&trace_types_lock); | |
977 | ||
d15f57f2 SR |
978 | if (!current_trace || current_trace != iter->trace) { |
979 | mutex_unlock(&trace_types_lock); | |
bc0c38d1 | 980 | return NULL; |
d15f57f2 | 981 | } |
bc0c38d1 SR |
982 | |
983 | atomic_inc(&trace_record_cmdline_disabled); | |
984 | ||
985 | /* let the tracer grab locks here if needed */ | |
986 | if (current_trace->start) | |
987 | current_trace->start(iter); | |
988 | ||
989 | if (*pos != iter->pos) { | |
990 | iter->ent = NULL; | |
991 | iter->cpu = 0; | |
992 | iter->idx = -1; | |
993 | ||
3928a8a2 SR |
994 | for_each_tracing_cpu(cpu) { |
995 | ring_buffer_iter_reset(iter->buffer_iter[cpu]); | |
4c11d7ae | 996 | } |
bc0c38d1 SR |
997 | |
998 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) | |
999 | ; | |
1000 | ||
1001 | } else { | |
4c11d7ae | 1002 | l = *pos - 1; |
bc0c38d1 SR |
1003 | p = s_next(m, p, &l); |
1004 | } | |
1005 | ||
1006 | return p; | |
1007 | } | |
1008 | ||
1009 | static void s_stop(struct seq_file *m, void *p) | |
1010 | { | |
1011 | struct trace_iterator *iter = m->private; | |
1012 | ||
1013 | atomic_dec(&trace_record_cmdline_disabled); | |
1014 | ||
1015 | /* let the tracer release locks here if needed */ | |
1016 | if (current_trace && current_trace == iter->trace && iter->trace->stop) | |
1017 | iter->trace->stop(iter); | |
1018 | ||
1019 | mutex_unlock(&trace_types_lock); | |
1020 | } | |
1021 | ||
76094a2c AS |
1022 | #define KRETPROBE_MSG "[unknown/kretprobe'd]" |
1023 | ||
1024 | #ifdef CONFIG_KRETPROBES | |
1025 | static inline int kretprobed(unsigned long addr) | |
1026 | { | |
1027 | return addr == (unsigned long)kretprobe_trampoline; | |
1028 | } | |
1029 | #else | |
1030 | static inline int kretprobed(unsigned long addr) | |
1031 | { | |
1032 | return 0; | |
1033 | } | |
1034 | #endif /* CONFIG_KRETPROBES */ | |
1035 | ||
b3806b43 | 1036 | static int |
214023c3 | 1037 | seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) |
bc0c38d1 SR |
1038 | { |
1039 | #ifdef CONFIG_KALLSYMS | |
1040 | char str[KSYM_SYMBOL_LEN]; | |
1041 | ||
1042 | kallsyms_lookup(address, NULL, NULL, NULL, str); | |
1043 | ||
b3806b43 | 1044 | return trace_seq_printf(s, fmt, str); |
bc0c38d1 | 1045 | #endif |
b3806b43 | 1046 | return 1; |
bc0c38d1 SR |
1047 | } |
1048 | ||
b3806b43 | 1049 | static int |
214023c3 SR |
1050 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
1051 | unsigned long address) | |
bc0c38d1 SR |
1052 | { |
1053 | #ifdef CONFIG_KALLSYMS | |
1054 | char str[KSYM_SYMBOL_LEN]; | |
1055 | ||
1056 | sprint_symbol(str, address); | |
b3806b43 | 1057 | return trace_seq_printf(s, fmt, str); |
bc0c38d1 | 1058 | #endif |
b3806b43 | 1059 | return 1; |
bc0c38d1 SR |
1060 | } |
1061 | ||
1062 | #ifndef CONFIG_64BIT | |
1063 | # define IP_FMT "%08lx" | |
1064 | #else | |
1065 | # define IP_FMT "%016lx" | |
1066 | #endif | |
1067 | ||
e309b41d | 1068 | static int |
214023c3 | 1069 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) |
bc0c38d1 | 1070 | { |
b3806b43 SR |
1071 | int ret; |
1072 | ||
1073 | if (!ip) | |
1074 | return trace_seq_printf(s, "0"); | |
bc0c38d1 SR |
1075 | |
1076 | if (sym_flags & TRACE_ITER_SYM_OFFSET) | |
b3806b43 | 1077 | ret = seq_print_sym_offset(s, "%s", ip); |
bc0c38d1 | 1078 | else |
b3806b43 SR |
1079 | ret = seq_print_sym_short(s, "%s", ip); |
1080 | ||
1081 | if (!ret) | |
1082 | return 0; | |
bc0c38d1 SR |
1083 | |
1084 | if (sym_flags & TRACE_ITER_SYM_ADDR) | |
b3806b43 SR |
1085 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
1086 | return ret; | |
bc0c38d1 SR |
1087 | } |
1088 | ||
e309b41d | 1089 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 | 1090 | { |
a6168353 ME |
1091 | seq_puts(m, "# _------=> CPU# \n"); |
1092 | seq_puts(m, "# / _-----=> irqs-off \n"); | |
1093 | seq_puts(m, "# | / _----=> need-resched \n"); | |
1094 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); | |
1095 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); | |
1096 | seq_puts(m, "# |||| / \n"); | |
1097 | seq_puts(m, "# ||||| delay \n"); | |
1098 | seq_puts(m, "# cmd pid ||||| time | caller \n"); | |
1099 | seq_puts(m, "# \\ / ||||| \\ | / \n"); | |
bc0c38d1 SR |
1100 | } |
1101 | ||
e309b41d | 1102 | static void print_func_help_header(struct seq_file *m) |
bc0c38d1 | 1103 | { |
a6168353 ME |
1104 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
1105 | seq_puts(m, "# | | | | |\n"); | |
bc0c38d1 SR |
1106 | } |
1107 | ||
1108 | ||
e309b41d | 1109 | static void |
bc0c38d1 SR |
1110 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
1111 | { | |
1112 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); | |
1113 | struct trace_array *tr = iter->tr; | |
1114 | struct trace_array_cpu *data = tr->data[tr->cpu]; | |
1115 | struct tracer *type = current_trace; | |
3928a8a2 SR |
1116 | unsigned long total; |
1117 | unsigned long entries; | |
bc0c38d1 SR |
1118 | const char *name = "preemption"; |
1119 | ||
1120 | if (type) | |
1121 | name = type->name; | |
1122 | ||
3928a8a2 SR |
1123 | entries = ring_buffer_entries(iter->tr->buffer); |
1124 | total = entries + | |
1125 | ring_buffer_overruns(iter->tr->buffer); | |
bc0c38d1 SR |
1126 | |
1127 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", | |
1128 | name, UTS_RELEASE); | |
1129 | seq_puts(m, "-----------------------------------" | |
1130 | "---------------------------------\n"); | |
1131 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" | |
1132 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", | |
57f50be1 | 1133 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 1134 | entries, |
4c11d7ae | 1135 | total, |
bc0c38d1 SR |
1136 | tr->cpu, |
1137 | #if defined(CONFIG_PREEMPT_NONE) | |
1138 | "server", | |
1139 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
1140 | "desktop", | |
b5c21b45 | 1141 | #elif defined(CONFIG_PREEMPT) |
bc0c38d1 SR |
1142 | "preempt", |
1143 | #else | |
1144 | "unknown", | |
1145 | #endif | |
1146 | /* These are reserved for later use */ | |
1147 | 0, 0, 0, 0); | |
1148 | #ifdef CONFIG_SMP | |
1149 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
1150 | #else | |
1151 | seq_puts(m, ")\n"); | |
1152 | #endif | |
1153 | seq_puts(m, " -----------------\n"); | |
1154 | seq_printf(m, " | task: %.16s-%d " | |
1155 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", | |
1156 | data->comm, data->pid, data->uid, data->nice, | |
1157 | data->policy, data->rt_priority); | |
1158 | seq_puts(m, " -----------------\n"); | |
1159 | ||
1160 | if (data->critical_start) { | |
1161 | seq_puts(m, " => started at: "); | |
214023c3 SR |
1162 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
1163 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 | 1164 | seq_puts(m, "\n => ended at: "); |
214023c3 SR |
1165 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
1166 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 SR |
1167 | seq_puts(m, "\n"); |
1168 | } | |
1169 | ||
1170 | seq_puts(m, "\n"); | |
1171 | } | |
1172 | ||
e309b41d | 1173 | static void |
214023c3 | 1174 | lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) |
bc0c38d1 SR |
1175 | { |
1176 | int hardirq, softirq; | |
1177 | char *comm; | |
1178 | ||
777e208d | 1179 | comm = trace_find_cmdline(entry->pid); |
bc0c38d1 | 1180 | |
777e208d | 1181 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
a6168353 | 1182 | trace_seq_printf(s, "%3d", cpu); |
214023c3 | 1183 | trace_seq_printf(s, "%c%c", |
777e208d SR |
1184 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.', |
1185 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); | |
bc0c38d1 | 1186 | |
777e208d SR |
1187 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; |
1188 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; | |
afc2abc0 | 1189 | if (hardirq && softirq) { |
214023c3 | 1190 | trace_seq_putc(s, 'H'); |
afc2abc0 IM |
1191 | } else { |
1192 | if (hardirq) { | |
214023c3 | 1193 | trace_seq_putc(s, 'h'); |
afc2abc0 | 1194 | } else { |
bc0c38d1 | 1195 | if (softirq) |
214023c3 | 1196 | trace_seq_putc(s, 's'); |
bc0c38d1 | 1197 | else |
214023c3 | 1198 | trace_seq_putc(s, '.'); |
bc0c38d1 SR |
1199 | } |
1200 | } | |
1201 | ||
777e208d SR |
1202 | if (entry->preempt_count) |
1203 | trace_seq_printf(s, "%x", entry->preempt_count); | |
bc0c38d1 | 1204 | else |
214023c3 | 1205 | trace_seq_puts(s, "."); |
bc0c38d1 SR |
1206 | } |
1207 | ||
1208 | unsigned long preempt_mark_thresh = 100; | |
1209 | ||
e309b41d | 1210 | static void |
3928a8a2 | 1211 | lat_print_timestamp(struct trace_seq *s, u64 abs_usecs, |
bc0c38d1 SR |
1212 | unsigned long rel_usecs) |
1213 | { | |
214023c3 | 1214 | trace_seq_printf(s, " %4lldus", abs_usecs); |
bc0c38d1 | 1215 | if (rel_usecs > preempt_mark_thresh) |
214023c3 | 1216 | trace_seq_puts(s, "!: "); |
bc0c38d1 | 1217 | else if (rel_usecs > 1) |
214023c3 | 1218 | trace_seq_puts(s, "+: "); |
bc0c38d1 | 1219 | else |
214023c3 | 1220 | trace_seq_puts(s, " : "); |
bc0c38d1 SR |
1221 | } |
1222 | ||
1223 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; | |
1224 | ||
fc5e27ae PP |
1225 | /* |
1226 | * The message is supposed to contain an ending newline. | |
1227 | * If the printing stops prematurely, try to add a newline of our own. | |
1228 | */ | |
1229 | void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter) | |
dd0e545f | 1230 | { |
dd0e545f | 1231 | struct trace_entry *ent; |
777e208d | 1232 | struct trace_field_cont *cont; |
fc5e27ae | 1233 | bool ok = true; |
dd0e545f | 1234 | |
3928a8a2 | 1235 | ent = peek_next_entry(iter, iter->cpu, NULL); |
dd0e545f SR |
1236 | if (!ent || ent->type != TRACE_CONT) { |
1237 | trace_seq_putc(s, '\n'); | |
1238 | return; | |
1239 | } | |
1240 | ||
1241 | do { | |
777e208d | 1242 | cont = (struct trace_field_cont *)ent; |
fc5e27ae | 1243 | if (ok) |
777e208d | 1244 | ok = (trace_seq_printf(s, "%s", cont->buf) > 0); |
3928a8a2 SR |
1245 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); |
1246 | ent = peek_next_entry(iter, iter->cpu, NULL); | |
dd0e545f | 1247 | } while (ent && ent->type == TRACE_CONT); |
fc5e27ae PP |
1248 | |
1249 | if (!ok) | |
1250 | trace_seq_putc(s, '\n'); | |
dd0e545f SR |
1251 | } |
1252 | ||
2c4f035f | 1253 | static enum print_line_t |
214023c3 | 1254 | print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) |
bc0c38d1 | 1255 | { |
214023c3 | 1256 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1257 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
3928a8a2 | 1258 | struct trace_entry *next_entry; |
bc0c38d1 SR |
1259 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); |
1260 | struct trace_entry *entry = iter->ent; | |
1261 | unsigned long abs_usecs; | |
1262 | unsigned long rel_usecs; | |
3928a8a2 | 1263 | u64 next_ts; |
bc0c38d1 | 1264 | char *comm; |
bac524d3 | 1265 | int S, T; |
86387f7e | 1266 | int i; |
d17d9691 | 1267 | unsigned state; |
bc0c38d1 | 1268 | |
dd0e545f | 1269 | if (entry->type == TRACE_CONT) |
2c4f035f | 1270 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1271 | |
3928a8a2 SR |
1272 | next_entry = find_next_entry(iter, NULL, &next_ts); |
1273 | if (!next_entry) | |
1274 | next_ts = iter->ts; | |
1275 | rel_usecs = ns2usecs(next_ts - iter->ts); | |
1276 | abs_usecs = ns2usecs(iter->ts - iter->tr->time_start); | |
bc0c38d1 SR |
1277 | |
1278 | if (verbose) { | |
777e208d | 1279 | comm = trace_find_cmdline(entry->pid); |
a6168353 | 1280 | trace_seq_printf(s, "%16s %5d %3d %d %08x %08x [%08lx]" |
214023c3 SR |
1281 | " %ld.%03ldms (+%ld.%03ldms): ", |
1282 | comm, | |
777e208d SR |
1283 | entry->pid, cpu, entry->flags, |
1284 | entry->preempt_count, trace_idx, | |
3928a8a2 | 1285 | ns2usecs(iter->ts), |
214023c3 SR |
1286 | abs_usecs/1000, |
1287 | abs_usecs % 1000, rel_usecs/1000, | |
1288 | rel_usecs % 1000); | |
bc0c38d1 | 1289 | } else { |
f29c73fe IM |
1290 | lat_print_generic(s, entry, cpu); |
1291 | lat_print_timestamp(s, abs_usecs, rel_usecs); | |
bc0c38d1 SR |
1292 | } |
1293 | switch (entry->type) { | |
777e208d SR |
1294 | case TRACE_FN: { |
1295 | struct ftrace_entry *field = (struct ftrace_entry *)entry; | |
1296 | ||
1297 | seq_print_ip_sym(s, field->ip, sym_flags); | |
214023c3 | 1298 | trace_seq_puts(s, " ("); |
777e208d | 1299 | if (kretprobed(field->parent_ip)) |
76094a2c AS |
1300 | trace_seq_puts(s, KRETPROBE_MSG); |
1301 | else | |
777e208d | 1302 | seq_print_ip_sym(s, field->parent_ip, sym_flags); |
214023c3 | 1303 | trace_seq_puts(s, ")\n"); |
bc0c38d1 | 1304 | break; |
777e208d | 1305 | } |
bc0c38d1 | 1306 | case TRACE_CTX: |
777e208d SR |
1307 | case TRACE_WAKE: { |
1308 | struct ctx_switch_entry *field = | |
1309 | (struct ctx_switch_entry *)entry; | |
1310 | ||
1311 | T = field->next_state < sizeof(state_to_char) ? | |
1312 | state_to_char[field->next_state] : 'X'; | |
bac524d3 | 1313 | |
777e208d SR |
1314 | state = field->prev_state ? |
1315 | __ffs(field->prev_state) + 1 : 0; | |
d17d9691 | 1316 | S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X'; |
777e208d | 1317 | comm = trace_find_cmdline(field->next_pid); |
80b5e940 | 1318 | trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n", |
777e208d SR |
1319 | field->prev_pid, |
1320 | field->prev_prio, | |
57422797 | 1321 | S, entry->type == TRACE_CTX ? "==>" : " +", |
777e208d SR |
1322 | field->next_cpu, |
1323 | field->next_pid, | |
1324 | field->next_prio, | |
bac524d3 | 1325 | T, comm); |
bc0c38d1 | 1326 | break; |
777e208d SR |
1327 | } |
1328 | case TRACE_SPECIAL: { | |
1329 | struct special_entry *field = (struct special_entry *)entry; | |
1330 | ||
88a4216c | 1331 | trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
1332 | field->arg1, |
1333 | field->arg2, | |
1334 | field->arg3); | |
f0a920d5 | 1335 | break; |
777e208d SR |
1336 | } |
1337 | case TRACE_STACK: { | |
1338 | struct stack_entry *field = (struct stack_entry *)entry; | |
1339 | ||
86387f7e IM |
1340 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
1341 | if (i) | |
1342 | trace_seq_puts(s, " <= "); | |
777e208d | 1343 | seq_print_ip_sym(s, field->caller[i], sym_flags); |
86387f7e IM |
1344 | } |
1345 | trace_seq_puts(s, "\n"); | |
1346 | break; | |
777e208d SR |
1347 | } |
1348 | case TRACE_PRINT: { | |
1349 | struct print_entry *field = (struct print_entry *)entry; | |
1350 | ||
1351 | seq_print_ip_sym(s, field->ip, sym_flags); | |
1352 | trace_seq_printf(s, ": %s", field->buf); | |
1353 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
1354 | trace_seq_print_cont(s, iter); |
1355 | break; | |
777e208d | 1356 | } |
89b2f978 | 1357 | default: |
214023c3 | 1358 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
bc0c38d1 | 1359 | } |
2c4f035f | 1360 | return TRACE_TYPE_HANDLED; |
bc0c38d1 SR |
1361 | } |
1362 | ||
2c4f035f | 1363 | static enum print_line_t print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 1364 | { |
214023c3 | 1365 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1366 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 1367 | struct trace_entry *entry; |
bc0c38d1 SR |
1368 | unsigned long usec_rem; |
1369 | unsigned long long t; | |
1370 | unsigned long secs; | |
1371 | char *comm; | |
b3806b43 | 1372 | int ret; |
bac524d3 | 1373 | int S, T; |
86387f7e | 1374 | int i; |
bc0c38d1 | 1375 | |
4e3c3333 | 1376 | entry = iter->ent; |
dd0e545f SR |
1377 | |
1378 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1379 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1380 | |
777e208d | 1381 | comm = trace_find_cmdline(iter->ent->pid); |
bc0c38d1 | 1382 | |
3928a8a2 | 1383 | t = ns2usecs(iter->ts); |
bc0c38d1 SR |
1384 | usec_rem = do_div(t, 1000000ULL); |
1385 | secs = (unsigned long)t; | |
1386 | ||
777e208d | 1387 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
f29c73fe | 1388 | if (!ret) |
2c4f035f | 1389 | return TRACE_TYPE_PARTIAL_LINE; |
a6168353 | 1390 | ret = trace_seq_printf(s, "[%03d] ", iter->cpu); |
f29c73fe | 1391 | if (!ret) |
2c4f035f | 1392 | return TRACE_TYPE_PARTIAL_LINE; |
f29c73fe IM |
1393 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); |
1394 | if (!ret) | |
2c4f035f | 1395 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 SR |
1396 | |
1397 | switch (entry->type) { | |
777e208d SR |
1398 | case TRACE_FN: { |
1399 | struct ftrace_entry *field = (struct ftrace_entry *)entry; | |
1400 | ||
1401 | ret = seq_print_ip_sym(s, field->ip, sym_flags); | |
b3806b43 | 1402 | if (!ret) |
2c4f035f | 1403 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1404 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
777e208d | 1405 | field->parent_ip) { |
b3806b43 SR |
1406 | ret = trace_seq_printf(s, " <-"); |
1407 | if (!ret) | |
2c4f035f | 1408 | return TRACE_TYPE_PARTIAL_LINE; |
777e208d | 1409 | if (kretprobed(field->parent_ip)) |
76094a2c AS |
1410 | ret = trace_seq_puts(s, KRETPROBE_MSG); |
1411 | else | |
2e2ca155 | 1412 | ret = seq_print_ip_sym(s, |
777e208d | 1413 | field->parent_ip, |
76094a2c | 1414 | sym_flags); |
b3806b43 | 1415 | if (!ret) |
2c4f035f | 1416 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1417 | } |
b3806b43 SR |
1418 | ret = trace_seq_printf(s, "\n"); |
1419 | if (!ret) | |
2c4f035f | 1420 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1421 | break; |
777e208d | 1422 | } |
bc0c38d1 | 1423 | case TRACE_CTX: |
777e208d SR |
1424 | case TRACE_WAKE: { |
1425 | struct ctx_switch_entry *field = | |
1426 | (struct ctx_switch_entry *)entry; | |
1427 | ||
1428 | S = field->prev_state < sizeof(state_to_char) ? | |
1429 | state_to_char[field->prev_state] : 'X'; | |
1430 | T = field->next_state < sizeof(state_to_char) ? | |
1431 | state_to_char[field->next_state] : 'X'; | |
80b5e940 | 1432 | ret = trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c\n", |
777e208d SR |
1433 | field->prev_pid, |
1434 | field->prev_prio, | |
b3806b43 | 1435 | S, |
57422797 | 1436 | entry->type == TRACE_CTX ? "==>" : " +", |
777e208d SR |
1437 | field->next_cpu, |
1438 | field->next_pid, | |
1439 | field->next_prio, | |
bac524d3 | 1440 | T); |
b3806b43 | 1441 | if (!ret) |
2c4f035f | 1442 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1443 | break; |
777e208d SR |
1444 | } |
1445 | case TRACE_SPECIAL: { | |
1446 | struct special_entry *field = (struct special_entry *)entry; | |
1447 | ||
88a4216c | 1448 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
1449 | field->arg1, |
1450 | field->arg2, | |
1451 | field->arg3); | |
f0a920d5 | 1452 | if (!ret) |
2c4f035f | 1453 | return TRACE_TYPE_PARTIAL_LINE; |
f0a920d5 | 1454 | break; |
777e208d SR |
1455 | } |
1456 | case TRACE_STACK: { | |
1457 | struct stack_entry *field = (struct stack_entry *)entry; | |
1458 | ||
86387f7e IM |
1459 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
1460 | if (i) { | |
1461 | ret = trace_seq_puts(s, " <= "); | |
1462 | if (!ret) | |
2c4f035f | 1463 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e | 1464 | } |
777e208d | 1465 | ret = seq_print_ip_sym(s, field->caller[i], |
86387f7e IM |
1466 | sym_flags); |
1467 | if (!ret) | |
2c4f035f | 1468 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e IM |
1469 | } |
1470 | ret = trace_seq_puts(s, "\n"); | |
1471 | if (!ret) | |
2c4f035f | 1472 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e | 1473 | break; |
777e208d SR |
1474 | } |
1475 | case TRACE_PRINT: { | |
1476 | struct print_entry *field = (struct print_entry *)entry; | |
1477 | ||
1478 | seq_print_ip_sym(s, field->ip, sym_flags); | |
1479 | trace_seq_printf(s, ": %s", field->buf); | |
1480 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
1481 | trace_seq_print_cont(s, iter); |
1482 | break; | |
bc0c38d1 | 1483 | } |
777e208d | 1484 | } |
2c4f035f | 1485 | return TRACE_TYPE_HANDLED; |
bc0c38d1 SR |
1486 | } |
1487 | ||
2c4f035f | 1488 | static enum print_line_t print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 IM |
1489 | { |
1490 | struct trace_seq *s = &iter->seq; | |
1491 | struct trace_entry *entry; | |
1492 | int ret; | |
bac524d3 | 1493 | int S, T; |
f9896bf3 IM |
1494 | |
1495 | entry = iter->ent; | |
dd0e545f SR |
1496 | |
1497 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1498 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1499 | |
f9896bf3 | 1500 | ret = trace_seq_printf(s, "%d %d %llu ", |
777e208d | 1501 | entry->pid, iter->cpu, iter->ts); |
f9896bf3 | 1502 | if (!ret) |
2c4f035f | 1503 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 IM |
1504 | |
1505 | switch (entry->type) { | |
777e208d SR |
1506 | case TRACE_FN: { |
1507 | struct ftrace_entry *field = (struct ftrace_entry *)entry; | |
1508 | ||
f9896bf3 | 1509 | ret = trace_seq_printf(s, "%x %x\n", |
777e208d SR |
1510 | field->ip, |
1511 | field->parent_ip); | |
f9896bf3 | 1512 | if (!ret) |
2c4f035f | 1513 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 | 1514 | break; |
777e208d | 1515 | } |
f9896bf3 | 1516 | case TRACE_CTX: |
777e208d SR |
1517 | case TRACE_WAKE: { |
1518 | struct ctx_switch_entry *field = | |
1519 | (struct ctx_switch_entry *)entry; | |
1520 | ||
1521 | S = field->prev_state < sizeof(state_to_char) ? | |
1522 | state_to_char[field->prev_state] : 'X'; | |
1523 | T = field->next_state < sizeof(state_to_char) ? | |
1524 | state_to_char[field->next_state] : 'X'; | |
57422797 IM |
1525 | if (entry->type == TRACE_WAKE) |
1526 | S = '+'; | |
80b5e940 | 1527 | ret = trace_seq_printf(s, "%d %d %c %d %d %d %c\n", |
777e208d SR |
1528 | field->prev_pid, |
1529 | field->prev_prio, | |
f9896bf3 | 1530 | S, |
777e208d SR |
1531 | field->next_cpu, |
1532 | field->next_pid, | |
1533 | field->next_prio, | |
bac524d3 | 1534 | T); |
f9896bf3 | 1535 | if (!ret) |
2c4f035f | 1536 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 | 1537 | break; |
777e208d | 1538 | } |
f0a920d5 | 1539 | case TRACE_SPECIAL: |
777e208d SR |
1540 | case TRACE_STACK: { |
1541 | struct special_entry *field = (struct special_entry *)entry; | |
1542 | ||
88a4216c | 1543 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
1544 | field->arg1, |
1545 | field->arg2, | |
1546 | field->arg3); | |
f0a920d5 | 1547 | if (!ret) |
2c4f035f | 1548 | return TRACE_TYPE_PARTIAL_LINE; |
f0a920d5 | 1549 | break; |
777e208d SR |
1550 | } |
1551 | case TRACE_PRINT: { | |
1552 | struct print_entry *field = (struct print_entry *)entry; | |
1553 | ||
1554 | trace_seq_printf(s, "# %lx %s", field->ip, field->buf); | |
1555 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
1556 | trace_seq_print_cont(s, iter); |
1557 | break; | |
f9896bf3 | 1558 | } |
777e208d | 1559 | } |
2c4f035f | 1560 | return TRACE_TYPE_HANDLED; |
f9896bf3 IM |
1561 | } |
1562 | ||
cb0f12aa IM |
1563 | #define SEQ_PUT_FIELD_RET(s, x) \ |
1564 | do { \ | |
1565 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ | |
1566 | return 0; \ | |
1567 | } while (0) | |
1568 | ||
5e3ca0ec IM |
1569 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
1570 | do { \ | |
1571 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ | |
1572 | return 0; \ | |
1573 | } while (0) | |
1574 | ||
2c4f035f | 1575 | static enum print_line_t print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec IM |
1576 | { |
1577 | struct trace_seq *s = &iter->seq; | |
1578 | unsigned char newline = '\n'; | |
1579 | struct trace_entry *entry; | |
bac524d3 | 1580 | int S, T; |
5e3ca0ec IM |
1581 | |
1582 | entry = iter->ent; | |
dd0e545f SR |
1583 | |
1584 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1585 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1586 | |
777e208d | 1587 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); |
5e3ca0ec | 1588 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); |
3928a8a2 | 1589 | SEQ_PUT_HEX_FIELD_RET(s, iter->ts); |
5e3ca0ec IM |
1590 | |
1591 | switch (entry->type) { | |
777e208d SR |
1592 | case TRACE_FN: { |
1593 | struct ftrace_entry *field = (struct ftrace_entry *)entry; | |
1594 | ||
1595 | SEQ_PUT_HEX_FIELD_RET(s, field->ip); | |
1596 | SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip); | |
5e3ca0ec | 1597 | break; |
777e208d | 1598 | } |
5e3ca0ec | 1599 | case TRACE_CTX: |
777e208d SR |
1600 | case TRACE_WAKE: { |
1601 | struct ctx_switch_entry *field = | |
1602 | (struct ctx_switch_entry *)entry; | |
1603 | ||
1604 | S = field->prev_state < sizeof(state_to_char) ? | |
1605 | state_to_char[field->prev_state] : 'X'; | |
1606 | T = field->next_state < sizeof(state_to_char) ? | |
1607 | state_to_char[field->next_state] : 'X'; | |
57422797 IM |
1608 | if (entry->type == TRACE_WAKE) |
1609 | S = '+'; | |
777e208d SR |
1610 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid); |
1611 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio); | |
5e3ca0ec | 1612 | SEQ_PUT_HEX_FIELD_RET(s, S); |
777e208d SR |
1613 | SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu); |
1614 | SEQ_PUT_HEX_FIELD_RET(s, field->next_pid); | |
1615 | SEQ_PUT_HEX_FIELD_RET(s, field->next_prio); | |
bac524d3 | 1616 | SEQ_PUT_HEX_FIELD_RET(s, T); |
5e3ca0ec | 1617 | break; |
777e208d | 1618 | } |
5e3ca0ec | 1619 | case TRACE_SPECIAL: |
777e208d SR |
1620 | case TRACE_STACK: { |
1621 | struct special_entry *field = (struct special_entry *)entry; | |
1622 | ||
1623 | SEQ_PUT_HEX_FIELD_RET(s, field->arg1); | |
1624 | SEQ_PUT_HEX_FIELD_RET(s, field->arg2); | |
1625 | SEQ_PUT_HEX_FIELD_RET(s, field->arg3); | |
5e3ca0ec IM |
1626 | break; |
1627 | } | |
777e208d | 1628 | } |
5e3ca0ec IM |
1629 | SEQ_PUT_FIELD_RET(s, newline); |
1630 | ||
2c4f035f | 1631 | return TRACE_TYPE_HANDLED; |
5e3ca0ec IM |
1632 | } |
1633 | ||
2c4f035f | 1634 | static enum print_line_t print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa IM |
1635 | { |
1636 | struct trace_seq *s = &iter->seq; | |
1637 | struct trace_entry *entry; | |
1638 | ||
1639 | entry = iter->ent; | |
dd0e545f SR |
1640 | |
1641 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1642 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1643 | |
777e208d SR |
1644 | SEQ_PUT_FIELD_RET(s, entry->pid); |
1645 | SEQ_PUT_FIELD_RET(s, iter->cpu); | |
3928a8a2 | 1646 | SEQ_PUT_FIELD_RET(s, iter->ts); |
cb0f12aa IM |
1647 | |
1648 | switch (entry->type) { | |
777e208d SR |
1649 | case TRACE_FN: { |
1650 | struct ftrace_entry *field = (struct ftrace_entry *)entry; | |
1651 | ||
1652 | SEQ_PUT_FIELD_RET(s, field->ip); | |
1653 | SEQ_PUT_FIELD_RET(s, field->parent_ip); | |
cb0f12aa | 1654 | break; |
777e208d SR |
1655 | } |
1656 | case TRACE_CTX: { | |
1657 | struct ctx_switch_entry *field = | |
1658 | (struct ctx_switch_entry *)entry; | |
1659 | ||
1660 | SEQ_PUT_FIELD_RET(s, field->prev_pid); | |
1661 | SEQ_PUT_FIELD_RET(s, field->prev_prio); | |
1662 | SEQ_PUT_FIELD_RET(s, field->prev_state); | |
1663 | SEQ_PUT_FIELD_RET(s, field->next_pid); | |
1664 | SEQ_PUT_FIELD_RET(s, field->next_prio); | |
1665 | SEQ_PUT_FIELD_RET(s, field->next_state); | |
cb0f12aa | 1666 | break; |
777e208d | 1667 | } |
f0a920d5 | 1668 | case TRACE_SPECIAL: |
777e208d SR |
1669 | case TRACE_STACK: { |
1670 | struct special_entry *field = (struct special_entry *)entry; | |
1671 | ||
1672 | SEQ_PUT_FIELD_RET(s, field->arg1); | |
1673 | SEQ_PUT_FIELD_RET(s, field->arg2); | |
1674 | SEQ_PUT_FIELD_RET(s, field->arg3); | |
f0a920d5 | 1675 | break; |
cb0f12aa | 1676 | } |
777e208d | 1677 | } |
cb0f12aa IM |
1678 | return 1; |
1679 | } | |
1680 | ||
bc0c38d1 SR |
1681 | static int trace_empty(struct trace_iterator *iter) |
1682 | { | |
bc0c38d1 SR |
1683 | int cpu; |
1684 | ||
ab46428c | 1685 | for_each_tracing_cpu(cpu) { |
3928a8a2 | 1686 | if (!ring_buffer_iter_empty(iter->buffer_iter[cpu])) |
bc0c38d1 SR |
1687 | return 0; |
1688 | } | |
2c4f035f | 1689 | return TRACE_TYPE_HANDLED; |
bc0c38d1 SR |
1690 | } |
1691 | ||
2c4f035f | 1692 | static enum print_line_t print_trace_line(struct trace_iterator *iter) |
f9896bf3 | 1693 | { |
2c4f035f FW |
1694 | enum print_line_t ret; |
1695 | ||
1696 | if (iter->trace && iter->trace->print_line) { | |
1697 | ret = iter->trace->print_line(iter); | |
1698 | if (ret != TRACE_TYPE_UNHANDLED) | |
1699 | return ret; | |
1700 | } | |
72829bc3 | 1701 | |
cb0f12aa IM |
1702 | if (trace_flags & TRACE_ITER_BIN) |
1703 | return print_bin_fmt(iter); | |
1704 | ||
5e3ca0ec IM |
1705 | if (trace_flags & TRACE_ITER_HEX) |
1706 | return print_hex_fmt(iter); | |
1707 | ||
f9896bf3 IM |
1708 | if (trace_flags & TRACE_ITER_RAW) |
1709 | return print_raw_fmt(iter); | |
1710 | ||
1711 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
1712 | return print_lat_fmt(iter, iter->idx, iter->cpu); | |
1713 | ||
1714 | return print_trace_fmt(iter); | |
1715 | } | |
1716 | ||
bc0c38d1 SR |
1717 | static int s_show(struct seq_file *m, void *v) |
1718 | { | |
1719 | struct trace_iterator *iter = v; | |
1720 | ||
1721 | if (iter->ent == NULL) { | |
1722 | if (iter->tr) { | |
1723 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
1724 | seq_puts(m, "#\n"); | |
1725 | } | |
1726 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { | |
1727 | /* print nothing if the buffers are empty */ | |
1728 | if (trace_empty(iter)) | |
1729 | return 0; | |
1730 | print_trace_header(m, iter); | |
1731 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1732 | print_lat_help_header(m); | |
1733 | } else { | |
1734 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1735 | print_func_help_header(m); | |
1736 | } | |
1737 | } else { | |
f9896bf3 | 1738 | print_trace_line(iter); |
214023c3 | 1739 | trace_print_seq(m, &iter->seq); |
bc0c38d1 SR |
1740 | } |
1741 | ||
1742 | return 0; | |
1743 | } | |
1744 | ||
1745 | static struct seq_operations tracer_seq_ops = { | |
4bf39a94 IM |
1746 | .start = s_start, |
1747 | .next = s_next, | |
1748 | .stop = s_stop, | |
1749 | .show = s_show, | |
bc0c38d1 SR |
1750 | }; |
1751 | ||
e309b41d | 1752 | static struct trace_iterator * |
bc0c38d1 SR |
1753 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
1754 | { | |
1755 | struct trace_iterator *iter; | |
3928a8a2 SR |
1756 | struct seq_file *m; |
1757 | int cpu; | |
bc0c38d1 | 1758 | |
60a11774 SR |
1759 | if (tracing_disabled) { |
1760 | *ret = -ENODEV; | |
1761 | return NULL; | |
1762 | } | |
1763 | ||
bc0c38d1 SR |
1764 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
1765 | if (!iter) { | |
1766 | *ret = -ENOMEM; | |
1767 | goto out; | |
1768 | } | |
1769 | ||
1770 | mutex_lock(&trace_types_lock); | |
1771 | if (current_trace && current_trace->print_max) | |
1772 | iter->tr = &max_tr; | |
1773 | else | |
1774 | iter->tr = inode->i_private; | |
1775 | iter->trace = current_trace; | |
1776 | iter->pos = -1; | |
1777 | ||
3928a8a2 SR |
1778 | for_each_tracing_cpu(cpu) { |
1779 | iter->buffer_iter[cpu] = | |
1780 | ring_buffer_read_start(iter->tr->buffer, cpu); | |
1781 | if (!iter->buffer_iter[cpu]) | |
1782 | goto fail_buffer; | |
1783 | } | |
1784 | ||
bc0c38d1 SR |
1785 | /* TODO stop tracer */ |
1786 | *ret = seq_open(file, &tracer_seq_ops); | |
3928a8a2 SR |
1787 | if (*ret) |
1788 | goto fail_buffer; | |
bc0c38d1 | 1789 | |
3928a8a2 SR |
1790 | m = file->private_data; |
1791 | m->private = iter; | |
bc0c38d1 | 1792 | |
3928a8a2 SR |
1793 | /* stop the trace while dumping */ |
1794 | if (iter->tr->ctrl) { | |
1795 | tracer_enabled = 0; | |
1796 | ftrace_function_enabled = 0; | |
bc0c38d1 | 1797 | } |
3928a8a2 SR |
1798 | |
1799 | if (iter->trace && iter->trace->open) | |
1800 | iter->trace->open(iter); | |
1801 | ||
bc0c38d1 SR |
1802 | mutex_unlock(&trace_types_lock); |
1803 | ||
1804 | out: | |
1805 | return iter; | |
3928a8a2 SR |
1806 | |
1807 | fail_buffer: | |
1808 | for_each_tracing_cpu(cpu) { | |
1809 | if (iter->buffer_iter[cpu]) | |
1810 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
1811 | } | |
1812 | mutex_unlock(&trace_types_lock); | |
1813 | ||
1814 | return ERR_PTR(-ENOMEM); | |
bc0c38d1 SR |
1815 | } |
1816 | ||
1817 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
1818 | { | |
60a11774 SR |
1819 | if (tracing_disabled) |
1820 | return -ENODEV; | |
1821 | ||
bc0c38d1 SR |
1822 | filp->private_data = inode->i_private; |
1823 | return 0; | |
1824 | } | |
1825 | ||
1826 | int tracing_release(struct inode *inode, struct file *file) | |
1827 | { | |
1828 | struct seq_file *m = (struct seq_file *)file->private_data; | |
1829 | struct trace_iterator *iter = m->private; | |
3928a8a2 | 1830 | int cpu; |
bc0c38d1 SR |
1831 | |
1832 | mutex_lock(&trace_types_lock); | |
3928a8a2 SR |
1833 | for_each_tracing_cpu(cpu) { |
1834 | if (iter->buffer_iter[cpu]) | |
1835 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
1836 | } | |
1837 | ||
bc0c38d1 SR |
1838 | if (iter->trace && iter->trace->close) |
1839 | iter->trace->close(iter); | |
1840 | ||
1841 | /* reenable tracing if it was previously enabled */ | |
60bc0800 | 1842 | if (iter->tr->ctrl) { |
bc0c38d1 | 1843 | tracer_enabled = 1; |
60bc0800 SR |
1844 | /* |
1845 | * It is safe to enable function tracing even if it | |
1846 | * isn't used | |
1847 | */ | |
1848 | ftrace_function_enabled = 1; | |
1849 | } | |
bc0c38d1 SR |
1850 | mutex_unlock(&trace_types_lock); |
1851 | ||
1852 | seq_release(inode, file); | |
1853 | kfree(iter); | |
1854 | return 0; | |
1855 | } | |
1856 | ||
1857 | static int tracing_open(struct inode *inode, struct file *file) | |
1858 | { | |
1859 | int ret; | |
1860 | ||
1861 | __tracing_open(inode, file, &ret); | |
1862 | ||
1863 | return ret; | |
1864 | } | |
1865 | ||
1866 | static int tracing_lt_open(struct inode *inode, struct file *file) | |
1867 | { | |
1868 | struct trace_iterator *iter; | |
1869 | int ret; | |
1870 | ||
1871 | iter = __tracing_open(inode, file, &ret); | |
1872 | ||
1873 | if (!ret) | |
1874 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
1875 | ||
1876 | return ret; | |
1877 | } | |
1878 | ||
1879 | ||
e309b41d | 1880 | static void * |
bc0c38d1 SR |
1881 | t_next(struct seq_file *m, void *v, loff_t *pos) |
1882 | { | |
1883 | struct tracer *t = m->private; | |
1884 | ||
1885 | (*pos)++; | |
1886 | ||
1887 | if (t) | |
1888 | t = t->next; | |
1889 | ||
1890 | m->private = t; | |
1891 | ||
1892 | return t; | |
1893 | } | |
1894 | ||
1895 | static void *t_start(struct seq_file *m, loff_t *pos) | |
1896 | { | |
1897 | struct tracer *t = m->private; | |
1898 | loff_t l = 0; | |
1899 | ||
1900 | mutex_lock(&trace_types_lock); | |
1901 | for (; t && l < *pos; t = t_next(m, t, &l)) | |
1902 | ; | |
1903 | ||
1904 | return t; | |
1905 | } | |
1906 | ||
1907 | static void t_stop(struct seq_file *m, void *p) | |
1908 | { | |
1909 | mutex_unlock(&trace_types_lock); | |
1910 | } | |
1911 | ||
1912 | static int t_show(struct seq_file *m, void *v) | |
1913 | { | |
1914 | struct tracer *t = v; | |
1915 | ||
1916 | if (!t) | |
1917 | return 0; | |
1918 | ||
1919 | seq_printf(m, "%s", t->name); | |
1920 | if (t->next) | |
1921 | seq_putc(m, ' '); | |
1922 | else | |
1923 | seq_putc(m, '\n'); | |
1924 | ||
1925 | return 0; | |
1926 | } | |
1927 | ||
1928 | static struct seq_operations show_traces_seq_ops = { | |
4bf39a94 IM |
1929 | .start = t_start, |
1930 | .next = t_next, | |
1931 | .stop = t_stop, | |
1932 | .show = t_show, | |
bc0c38d1 SR |
1933 | }; |
1934 | ||
1935 | static int show_traces_open(struct inode *inode, struct file *file) | |
1936 | { | |
1937 | int ret; | |
1938 | ||
60a11774 SR |
1939 | if (tracing_disabled) |
1940 | return -ENODEV; | |
1941 | ||
bc0c38d1 SR |
1942 | ret = seq_open(file, &show_traces_seq_ops); |
1943 | if (!ret) { | |
1944 | struct seq_file *m = file->private_data; | |
1945 | m->private = trace_types; | |
1946 | } | |
1947 | ||
1948 | return ret; | |
1949 | } | |
1950 | ||
1951 | static struct file_operations tracing_fops = { | |
4bf39a94 IM |
1952 | .open = tracing_open, |
1953 | .read = seq_read, | |
1954 | .llseek = seq_lseek, | |
1955 | .release = tracing_release, | |
bc0c38d1 SR |
1956 | }; |
1957 | ||
1958 | static struct file_operations tracing_lt_fops = { | |
4bf39a94 IM |
1959 | .open = tracing_lt_open, |
1960 | .read = seq_read, | |
1961 | .llseek = seq_lseek, | |
1962 | .release = tracing_release, | |
bc0c38d1 SR |
1963 | }; |
1964 | ||
1965 | static struct file_operations show_traces_fops = { | |
c7078de1 IM |
1966 | .open = show_traces_open, |
1967 | .read = seq_read, | |
1968 | .release = seq_release, | |
1969 | }; | |
1970 | ||
36dfe925 IM |
1971 | /* |
1972 | * Only trace on a CPU if the bitmask is set: | |
1973 | */ | |
1974 | static cpumask_t tracing_cpumask = CPU_MASK_ALL; | |
1975 | ||
1976 | /* | |
1977 | * When tracing/tracing_cpu_mask is modified then this holds | |
1978 | * the new bitmask we are about to install: | |
1979 | */ | |
1980 | static cpumask_t tracing_cpumask_new; | |
1981 | ||
1982 | /* | |
1983 | * The tracer itself will not take this lock, but still we want | |
1984 | * to provide a consistent cpumask to user-space: | |
1985 | */ | |
1986 | static DEFINE_MUTEX(tracing_cpumask_update_lock); | |
1987 | ||
1988 | /* | |
1989 | * Temporary storage for the character representation of the | |
1990 | * CPU bitmask (and one more byte for the newline): | |
1991 | */ | |
1992 | static char mask_str[NR_CPUS + 1]; | |
1993 | ||
c7078de1 IM |
1994 | static ssize_t |
1995 | tracing_cpumask_read(struct file *filp, char __user *ubuf, | |
1996 | size_t count, loff_t *ppos) | |
1997 | { | |
36dfe925 | 1998 | int len; |
c7078de1 IM |
1999 | |
2000 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 IM |
2001 | |
2002 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); | |
2003 | if (count - len < 2) { | |
2004 | count = -EINVAL; | |
2005 | goto out_err; | |
2006 | } | |
2007 | len += sprintf(mask_str + len, "\n"); | |
2008 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); | |
2009 | ||
2010 | out_err: | |
c7078de1 IM |
2011 | mutex_unlock(&tracing_cpumask_update_lock); |
2012 | ||
2013 | return count; | |
2014 | } | |
2015 | ||
2016 | static ssize_t | |
2017 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, | |
2018 | size_t count, loff_t *ppos) | |
2019 | { | |
36dfe925 | 2020 | int err, cpu; |
c7078de1 IM |
2021 | |
2022 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 | 2023 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
c7078de1 | 2024 | if (err) |
36dfe925 IM |
2025 | goto err_unlock; |
2026 | ||
92205c23 SR |
2027 | raw_local_irq_disable(); |
2028 | __raw_spin_lock(&ftrace_max_lock); | |
ab46428c | 2029 | for_each_tracing_cpu(cpu) { |
36dfe925 IM |
2030 | /* |
2031 | * Increase/decrease the disabled counter if we are | |
2032 | * about to flip a bit in the cpumask: | |
2033 | */ | |
2034 | if (cpu_isset(cpu, tracing_cpumask) && | |
2035 | !cpu_isset(cpu, tracing_cpumask_new)) { | |
2036 | atomic_inc(&global_trace.data[cpu]->disabled); | |
2037 | } | |
2038 | if (!cpu_isset(cpu, tracing_cpumask) && | |
2039 | cpu_isset(cpu, tracing_cpumask_new)) { | |
2040 | atomic_dec(&global_trace.data[cpu]->disabled); | |
2041 | } | |
2042 | } | |
92205c23 SR |
2043 | __raw_spin_unlock(&ftrace_max_lock); |
2044 | raw_local_irq_enable(); | |
36dfe925 IM |
2045 | |
2046 | tracing_cpumask = tracing_cpumask_new; | |
2047 | ||
2048 | mutex_unlock(&tracing_cpumask_update_lock); | |
c7078de1 IM |
2049 | |
2050 | return count; | |
36dfe925 IM |
2051 | |
2052 | err_unlock: | |
2053 | mutex_unlock(&tracing_cpumask_update_lock); | |
2054 | ||
2055 | return err; | |
c7078de1 IM |
2056 | } |
2057 | ||
2058 | static struct file_operations tracing_cpumask_fops = { | |
2059 | .open = tracing_open_generic, | |
2060 | .read = tracing_cpumask_read, | |
2061 | .write = tracing_cpumask_write, | |
bc0c38d1 SR |
2062 | }; |
2063 | ||
2064 | static ssize_t | |
2065 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, | |
2066 | size_t cnt, loff_t *ppos) | |
2067 | { | |
2068 | char *buf; | |
2069 | int r = 0; | |
2070 | int len = 0; | |
2071 | int i; | |
2072 | ||
2073 | /* calulate max size */ | |
2074 | for (i = 0; trace_options[i]; i++) { | |
2075 | len += strlen(trace_options[i]); | |
2076 | len += 3; /* "no" and space */ | |
2077 | } | |
2078 | ||
2079 | /* +2 for \n and \0 */ | |
2080 | buf = kmalloc(len + 2, GFP_KERNEL); | |
2081 | if (!buf) | |
2082 | return -ENOMEM; | |
2083 | ||
2084 | for (i = 0; trace_options[i]; i++) { | |
2085 | if (trace_flags & (1 << i)) | |
2086 | r += sprintf(buf + r, "%s ", trace_options[i]); | |
2087 | else | |
2088 | r += sprintf(buf + r, "no%s ", trace_options[i]); | |
2089 | } | |
2090 | ||
2091 | r += sprintf(buf + r, "\n"); | |
2092 | WARN_ON(r >= len + 2); | |
2093 | ||
36dfe925 | 2094 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2095 | |
2096 | kfree(buf); | |
2097 | ||
2098 | return r; | |
2099 | } | |
2100 | ||
2101 | static ssize_t | |
2102 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, | |
2103 | size_t cnt, loff_t *ppos) | |
2104 | { | |
2105 | char buf[64]; | |
2106 | char *cmp = buf; | |
2107 | int neg = 0; | |
2108 | int i; | |
2109 | ||
cffae437 SR |
2110 | if (cnt >= sizeof(buf)) |
2111 | return -EINVAL; | |
bc0c38d1 SR |
2112 | |
2113 | if (copy_from_user(&buf, ubuf, cnt)) | |
2114 | return -EFAULT; | |
2115 | ||
2116 | buf[cnt] = 0; | |
2117 | ||
2118 | if (strncmp(buf, "no", 2) == 0) { | |
2119 | neg = 1; | |
2120 | cmp += 2; | |
2121 | } | |
2122 | ||
2123 | for (i = 0; trace_options[i]; i++) { | |
2124 | int len = strlen(trace_options[i]); | |
2125 | ||
2126 | if (strncmp(cmp, trace_options[i], len) == 0) { | |
2127 | if (neg) | |
2128 | trace_flags &= ~(1 << i); | |
2129 | else | |
2130 | trace_flags |= (1 << i); | |
2131 | break; | |
2132 | } | |
2133 | } | |
442e544c IM |
2134 | /* |
2135 | * If no option could be set, return an error: | |
2136 | */ | |
2137 | if (!trace_options[i]) | |
2138 | return -EINVAL; | |
bc0c38d1 SR |
2139 | |
2140 | filp->f_pos += cnt; | |
2141 | ||
2142 | return cnt; | |
2143 | } | |
2144 | ||
2145 | static struct file_operations tracing_iter_fops = { | |
c7078de1 IM |
2146 | .open = tracing_open_generic, |
2147 | .read = tracing_iter_ctrl_read, | |
2148 | .write = tracing_iter_ctrl_write, | |
bc0c38d1 SR |
2149 | }; |
2150 | ||
7bd2f24c IM |
2151 | static const char readme_msg[] = |
2152 | "tracing mini-HOWTO:\n\n" | |
2153 | "# mkdir /debug\n" | |
2154 | "# mount -t debugfs nodev /debug\n\n" | |
2155 | "# cat /debug/tracing/available_tracers\n" | |
2156 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" | |
2157 | "# cat /debug/tracing/current_tracer\n" | |
2158 | "none\n" | |
2159 | "# echo sched_switch > /debug/tracing/current_tracer\n" | |
2160 | "# cat /debug/tracing/current_tracer\n" | |
2161 | "sched_switch\n" | |
2162 | "# cat /debug/tracing/iter_ctrl\n" | |
2163 | "noprint-parent nosym-offset nosym-addr noverbose\n" | |
2164 | "# echo print-parent > /debug/tracing/iter_ctrl\n" | |
2165 | "# echo 1 > /debug/tracing/tracing_enabled\n" | |
2166 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" | |
2167 | "echo 0 > /debug/tracing/tracing_enabled\n" | |
2168 | ; | |
2169 | ||
2170 | static ssize_t | |
2171 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
2172 | size_t cnt, loff_t *ppos) | |
2173 | { | |
2174 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
2175 | readme_msg, strlen(readme_msg)); | |
2176 | } | |
2177 | ||
2178 | static struct file_operations tracing_readme_fops = { | |
c7078de1 IM |
2179 | .open = tracing_open_generic, |
2180 | .read = tracing_readme_read, | |
7bd2f24c IM |
2181 | }; |
2182 | ||
bc0c38d1 SR |
2183 | static ssize_t |
2184 | tracing_ctrl_read(struct file *filp, char __user *ubuf, | |
2185 | size_t cnt, loff_t *ppos) | |
2186 | { | |
2187 | struct trace_array *tr = filp->private_data; | |
2188 | char buf[64]; | |
2189 | int r; | |
2190 | ||
2191 | r = sprintf(buf, "%ld\n", tr->ctrl); | |
4e3c3333 | 2192 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2193 | } |
2194 | ||
2195 | static ssize_t | |
2196 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, | |
2197 | size_t cnt, loff_t *ppos) | |
2198 | { | |
2199 | struct trace_array *tr = filp->private_data; | |
bc0c38d1 | 2200 | char buf[64]; |
c6caeeb1 SR |
2201 | long val; |
2202 | int ret; | |
bc0c38d1 | 2203 | |
cffae437 SR |
2204 | if (cnt >= sizeof(buf)) |
2205 | return -EINVAL; | |
bc0c38d1 SR |
2206 | |
2207 | if (copy_from_user(&buf, ubuf, cnt)) | |
2208 | return -EFAULT; | |
2209 | ||
2210 | buf[cnt] = 0; | |
2211 | ||
c6caeeb1 SR |
2212 | ret = strict_strtoul(buf, 10, &val); |
2213 | if (ret < 0) | |
2214 | return ret; | |
bc0c38d1 SR |
2215 | |
2216 | val = !!val; | |
2217 | ||
2218 | mutex_lock(&trace_types_lock); | |
2219 | if (tr->ctrl ^ val) { | |
2220 | if (val) | |
2221 | tracer_enabled = 1; | |
2222 | else | |
2223 | tracer_enabled = 0; | |
2224 | ||
2225 | tr->ctrl = val; | |
2226 | ||
2227 | if (current_trace && current_trace->ctrl_update) | |
2228 | current_trace->ctrl_update(tr); | |
2229 | } | |
2230 | mutex_unlock(&trace_types_lock); | |
2231 | ||
2232 | filp->f_pos += cnt; | |
2233 | ||
2234 | return cnt; | |
2235 | } | |
2236 | ||
2237 | static ssize_t | |
2238 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
2239 | size_t cnt, loff_t *ppos) | |
2240 | { | |
2241 | char buf[max_tracer_type_len+2]; | |
2242 | int r; | |
2243 | ||
2244 | mutex_lock(&trace_types_lock); | |
2245 | if (current_trace) | |
2246 | r = sprintf(buf, "%s\n", current_trace->name); | |
2247 | else | |
2248 | r = sprintf(buf, "\n"); | |
2249 | mutex_unlock(&trace_types_lock); | |
2250 | ||
4bf39a94 | 2251 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2252 | } |
2253 | ||
2254 | static ssize_t | |
2255 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
2256 | size_t cnt, loff_t *ppos) | |
2257 | { | |
2258 | struct trace_array *tr = &global_trace; | |
2259 | struct tracer *t; | |
2260 | char buf[max_tracer_type_len+1]; | |
2261 | int i; | |
2262 | ||
2263 | if (cnt > max_tracer_type_len) | |
2264 | cnt = max_tracer_type_len; | |
2265 | ||
2266 | if (copy_from_user(&buf, ubuf, cnt)) | |
2267 | return -EFAULT; | |
2268 | ||
2269 | buf[cnt] = 0; | |
2270 | ||
2271 | /* strip ending whitespace. */ | |
2272 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
2273 | buf[i] = 0; | |
2274 | ||
2275 | mutex_lock(&trace_types_lock); | |
2276 | for (t = trace_types; t; t = t->next) { | |
2277 | if (strcmp(t->name, buf) == 0) | |
2278 | break; | |
2279 | } | |
2280 | if (!t || t == current_trace) | |
2281 | goto out; | |
2282 | ||
2283 | if (current_trace && current_trace->reset) | |
2284 | current_trace->reset(tr); | |
2285 | ||
2286 | current_trace = t; | |
2287 | if (t->init) | |
2288 | t->init(tr); | |
2289 | ||
2290 | out: | |
2291 | mutex_unlock(&trace_types_lock); | |
2292 | ||
2293 | filp->f_pos += cnt; | |
2294 | ||
2295 | return cnt; | |
2296 | } | |
2297 | ||
2298 | static ssize_t | |
2299 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
2300 | size_t cnt, loff_t *ppos) | |
2301 | { | |
2302 | unsigned long *ptr = filp->private_data; | |
2303 | char buf[64]; | |
2304 | int r; | |
2305 | ||
cffae437 | 2306 | r = snprintf(buf, sizeof(buf), "%ld\n", |
bc0c38d1 | 2307 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
cffae437 SR |
2308 | if (r > sizeof(buf)) |
2309 | r = sizeof(buf); | |
4bf39a94 | 2310 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2311 | } |
2312 | ||
2313 | static ssize_t | |
2314 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
2315 | size_t cnt, loff_t *ppos) | |
2316 | { | |
2317 | long *ptr = 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 | *ptr = val * 1000; | |
2335 | ||
2336 | return cnt; | |
2337 | } | |
2338 | ||
b3806b43 SR |
2339 | static atomic_t tracing_reader; |
2340 | ||
2341 | static int tracing_open_pipe(struct inode *inode, struct file *filp) | |
2342 | { | |
2343 | struct trace_iterator *iter; | |
3928a8a2 | 2344 | int cpu; |
b3806b43 SR |
2345 | |
2346 | if (tracing_disabled) | |
2347 | return -ENODEV; | |
2348 | ||
2349 | /* We only allow for reader of the pipe */ | |
2350 | if (atomic_inc_return(&tracing_reader) != 1) { | |
2351 | atomic_dec(&tracing_reader); | |
2352 | return -EBUSY; | |
2353 | } | |
2354 | ||
2355 | /* create a buffer to store the information to pass to userspace */ | |
2356 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
2357 | if (!iter) | |
2358 | return -ENOMEM; | |
2359 | ||
107bad8b | 2360 | mutex_lock(&trace_types_lock); |
b3806b43 | 2361 | iter->tr = &global_trace; |
72829bc3 | 2362 | iter->trace = current_trace; |
b3806b43 SR |
2363 | filp->private_data = iter; |
2364 | ||
3928a8a2 SR |
2365 | for_each_tracing_cpu(cpu) { |
2366 | iter->buffer_iter[cpu] = | |
2367 | ring_buffer_read_start(iter->tr->buffer, cpu); | |
2368 | if (!iter->buffer_iter[cpu]) | |
2369 | goto fail_buffer; | |
2370 | } | |
2371 | ||
107bad8b SR |
2372 | if (iter->trace->pipe_open) |
2373 | iter->trace->pipe_open(iter); | |
2374 | mutex_unlock(&trace_types_lock); | |
2375 | ||
b3806b43 | 2376 | return 0; |
3928a8a2 SR |
2377 | |
2378 | fail_buffer: | |
2379 | for_each_tracing_cpu(cpu) { | |
2380 | if (iter->buffer_iter[cpu]) | |
2381 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
2382 | } | |
2383 | mutex_unlock(&trace_types_lock); | |
2384 | ||
2385 | return -ENOMEM; | |
b3806b43 SR |
2386 | } |
2387 | ||
2388 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
2389 | { | |
2390 | struct trace_iterator *iter = file->private_data; | |
3928a8a2 | 2391 | int cpu; |
b3806b43 | 2392 | |
3928a8a2 SR |
2393 | for_each_tracing_cpu(cpu) { |
2394 | if (iter->buffer_iter[cpu]) | |
2395 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
2396 | } | |
b3806b43 SR |
2397 | kfree(iter); |
2398 | atomic_dec(&tracing_reader); | |
2399 | ||
2400 | return 0; | |
2401 | } | |
2402 | ||
2a2cc8f7 SSP |
2403 | static unsigned int |
2404 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) | |
2405 | { | |
2406 | struct trace_iterator *iter = filp->private_data; | |
2407 | ||
2408 | if (trace_flags & TRACE_ITER_BLOCK) { | |
2409 | /* | |
2410 | * Always select as readable when in blocking mode | |
2411 | */ | |
2412 | return POLLIN | POLLRDNORM; | |
afc2abc0 | 2413 | } else { |
2a2cc8f7 SSP |
2414 | if (!trace_empty(iter)) |
2415 | return POLLIN | POLLRDNORM; | |
2416 | poll_wait(filp, &trace_wait, poll_table); | |
2417 | if (!trace_empty(iter)) | |
2418 | return POLLIN | POLLRDNORM; | |
2419 | ||
2420 | return 0; | |
2421 | } | |
2422 | } | |
2423 | ||
b3806b43 SR |
2424 | /* |
2425 | * Consumer reader. | |
2426 | */ | |
2427 | static ssize_t | |
2428 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
2429 | size_t cnt, loff_t *ppos) | |
2430 | { | |
2431 | struct trace_iterator *iter = filp->private_data; | |
b3806b43 | 2432 | unsigned long flags; |
25770467 | 2433 | #ifdef CONFIG_FTRACE |
2e0f5761 | 2434 | int ftrace_save; |
25770467 | 2435 | #endif |
6c6c2796 | 2436 | ssize_t sret; |
b3806b43 SR |
2437 | |
2438 | /* return any leftover data */ | |
6c6c2796 PP |
2439 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
2440 | if (sret != -EBUSY) | |
2441 | return sret; | |
b3806b43 | 2442 | |
6c6c2796 | 2443 | trace_seq_reset(&iter->seq); |
b3806b43 | 2444 | |
107bad8b SR |
2445 | mutex_lock(&trace_types_lock); |
2446 | if (iter->trace->read) { | |
6c6c2796 PP |
2447 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); |
2448 | if (sret) | |
107bad8b | 2449 | goto out; |
107bad8b SR |
2450 | } |
2451 | ||
9ff4b974 PP |
2452 | waitagain: |
2453 | sret = 0; | |
b3806b43 | 2454 | while (trace_empty(iter)) { |
2dc8f095 | 2455 | |
107bad8b | 2456 | if ((filp->f_flags & O_NONBLOCK)) { |
6c6c2796 | 2457 | sret = -EAGAIN; |
107bad8b SR |
2458 | goto out; |
2459 | } | |
2dc8f095 | 2460 | |
b3806b43 SR |
2461 | /* |
2462 | * This is a make-shift waitqueue. The reason we don't use | |
2463 | * an actual wait queue is because: | |
2464 | * 1) we only ever have one waiter | |
2465 | * 2) the tracing, traces all functions, we don't want | |
2466 | * the overhead of calling wake_up and friends | |
2467 | * (and tracing them too) | |
2468 | * Anyway, this is really very primitive wakeup. | |
2469 | */ | |
2470 | set_current_state(TASK_INTERRUPTIBLE); | |
2471 | iter->tr->waiter = current; | |
2472 | ||
107bad8b SR |
2473 | mutex_unlock(&trace_types_lock); |
2474 | ||
9fe068e9 IM |
2475 | /* sleep for 100 msecs, and try again. */ |
2476 | schedule_timeout(HZ/10); | |
b3806b43 | 2477 | |
107bad8b SR |
2478 | mutex_lock(&trace_types_lock); |
2479 | ||
b3806b43 SR |
2480 | iter->tr->waiter = NULL; |
2481 | ||
107bad8b | 2482 | if (signal_pending(current)) { |
6c6c2796 | 2483 | sret = -EINTR; |
107bad8b SR |
2484 | goto out; |
2485 | } | |
b3806b43 | 2486 | |
84527997 | 2487 | if (iter->trace != current_trace) |
107bad8b | 2488 | goto out; |
84527997 | 2489 | |
b3806b43 SR |
2490 | /* |
2491 | * We block until we read something and tracing is disabled. | |
2492 | * We still block if tracing is disabled, but we have never | |
2493 | * read anything. This allows a user to cat this file, and | |
2494 | * then enable tracing. But after we have read something, | |
2495 | * we give an EOF when tracing is again disabled. | |
2496 | * | |
2497 | * iter->pos will be 0 if we haven't read anything. | |
2498 | */ | |
2499 | if (!tracer_enabled && iter->pos) | |
2500 | break; | |
2501 | ||
2502 | continue; | |
2503 | } | |
2504 | ||
2505 | /* stop when tracing is finished */ | |
2506 | if (trace_empty(iter)) | |
107bad8b | 2507 | goto out; |
b3806b43 SR |
2508 | |
2509 | if (cnt >= PAGE_SIZE) | |
2510 | cnt = PAGE_SIZE - 1; | |
2511 | ||
53d0aa77 | 2512 | /* reset all but tr, trace, and overruns */ |
53d0aa77 SR |
2513 | memset(&iter->seq, 0, |
2514 | sizeof(struct trace_iterator) - | |
2515 | offsetof(struct trace_iterator, seq)); | |
4823ed7e | 2516 | iter->pos = -1; |
b3806b43 SR |
2517 | |
2518 | /* | |
2519 | * We need to stop all tracing on all CPUS to read the | |
2520 | * the next buffer. This is a bit expensive, but is | |
2521 | * not done often. We fill all what we can read, | |
2522 | * and then release the locks again. | |
2523 | */ | |
2524 | ||
3928a8a2 | 2525 | local_irq_disable(); |
25770467 | 2526 | #ifdef CONFIG_FTRACE |
2e0f5761 IM |
2527 | ftrace_save = ftrace_enabled; |
2528 | ftrace_enabled = 0; | |
25770467 | 2529 | #endif |
2e0f5761 | 2530 | smp_wmb(); |
3928a8a2 | 2531 | ring_buffer_lock(iter->tr->buffer, &flags); |
2e0f5761 | 2532 | |
088b1e42 | 2533 | while (find_next_entry_inc(iter) != NULL) { |
2c4f035f | 2534 | enum print_line_t ret; |
088b1e42 SR |
2535 | int len = iter->seq.len; |
2536 | ||
f9896bf3 | 2537 | ret = print_trace_line(iter); |
2c4f035f | 2538 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
088b1e42 SR |
2539 | /* don't print partial lines */ |
2540 | iter->seq.len = len; | |
b3806b43 | 2541 | break; |
088b1e42 | 2542 | } |
b3806b43 SR |
2543 | |
2544 | trace_consume(iter); | |
2545 | ||
2546 | if (iter->seq.len >= cnt) | |
2547 | break; | |
b3806b43 SR |
2548 | } |
2549 | ||
3928a8a2 | 2550 | ring_buffer_unlock(iter->tr->buffer, flags); |
25770467 | 2551 | #ifdef CONFIG_FTRACE |
2e0f5761 | 2552 | ftrace_enabled = ftrace_save; |
25770467 | 2553 | #endif |
3928a8a2 | 2554 | local_irq_enable(); |
b3806b43 SR |
2555 | |
2556 | /* Now copy what we have to the user */ | |
6c6c2796 PP |
2557 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
2558 | if (iter->seq.readpos >= iter->seq.len) | |
b3806b43 | 2559 | trace_seq_reset(&iter->seq); |
9ff4b974 PP |
2560 | |
2561 | /* | |
2562 | * If there was nothing to send to user, inspite of consuming trace | |
2563 | * entries, go back to wait for more entries. | |
2564 | */ | |
6c6c2796 | 2565 | if (sret == -EBUSY) |
9ff4b974 | 2566 | goto waitagain; |
b3806b43 | 2567 | |
107bad8b SR |
2568 | out: |
2569 | mutex_unlock(&trace_types_lock); | |
2570 | ||
6c6c2796 | 2571 | return sret; |
b3806b43 SR |
2572 | } |
2573 | ||
a98a3c3f SR |
2574 | static ssize_t |
2575 | tracing_entries_read(struct file *filp, char __user *ubuf, | |
2576 | size_t cnt, loff_t *ppos) | |
2577 | { | |
2578 | struct trace_array *tr = filp->private_data; | |
2579 | char buf[64]; | |
2580 | int r; | |
2581 | ||
2582 | r = sprintf(buf, "%lu\n", tr->entries); | |
2583 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
2584 | } | |
2585 | ||
2586 | static ssize_t | |
2587 | tracing_entries_write(struct file *filp, const char __user *ubuf, | |
2588 | size_t cnt, loff_t *ppos) | |
2589 | { | |
2590 | unsigned long val; | |
2591 | char buf[64]; | |
3928a8a2 | 2592 | int ret; |
43a15386 | 2593 | struct trace_array *tr = filp->private_data; |
a98a3c3f | 2594 | |
cffae437 SR |
2595 | if (cnt >= sizeof(buf)) |
2596 | return -EINVAL; | |
a98a3c3f SR |
2597 | |
2598 | if (copy_from_user(&buf, ubuf, cnt)) | |
2599 | return -EFAULT; | |
2600 | ||
2601 | buf[cnt] = 0; | |
2602 | ||
c6caeeb1 SR |
2603 | ret = strict_strtoul(buf, 10, &val); |
2604 | if (ret < 0) | |
2605 | return ret; | |
a98a3c3f SR |
2606 | |
2607 | /* must have at least 1 entry */ | |
2608 | if (!val) | |
2609 | return -EINVAL; | |
2610 | ||
2611 | mutex_lock(&trace_types_lock); | |
2612 | ||
43a15386 | 2613 | if (tr->ctrl) { |
a98a3c3f | 2614 | cnt = -EBUSY; |
43a15386 | 2615 | pr_info("ftrace: please disable tracing" |
a98a3c3f SR |
2616 | " before modifying buffer size\n"); |
2617 | goto out; | |
2618 | } | |
2619 | ||
3928a8a2 SR |
2620 | if (val != global_trace.entries) { |
2621 | ret = ring_buffer_resize(global_trace.buffer, val); | |
2622 | if (ret < 0) { | |
2623 | cnt = ret; | |
3eefae99 SR |
2624 | goto out; |
2625 | } | |
2626 | ||
3928a8a2 SR |
2627 | ret = ring_buffer_resize(max_tr.buffer, val); |
2628 | if (ret < 0) { | |
2629 | int r; | |
2630 | cnt = ret; | |
2631 | r = ring_buffer_resize(global_trace.buffer, | |
2632 | global_trace.entries); | |
2633 | if (r < 0) { | |
2634 | /* AARGH! We are left with different | |
2635 | * size max buffer!!!! */ | |
2636 | WARN_ON(1); | |
2637 | tracing_disabled = 1; | |
a98a3c3f | 2638 | } |
3928a8a2 | 2639 | goto out; |
a98a3c3f | 2640 | } |
3eefae99 | 2641 | |
3928a8a2 | 2642 | global_trace.entries = val; |
a98a3c3f SR |
2643 | } |
2644 | ||
2645 | filp->f_pos += cnt; | |
2646 | ||
19384c03 SR |
2647 | /* If check pages failed, return ENOMEM */ |
2648 | if (tracing_disabled) | |
2649 | cnt = -ENOMEM; | |
a98a3c3f SR |
2650 | out: |
2651 | max_tr.entries = global_trace.entries; | |
2652 | mutex_unlock(&trace_types_lock); | |
2653 | ||
2654 | return cnt; | |
2655 | } | |
2656 | ||
5bf9a1ee PP |
2657 | static int mark_printk(const char *fmt, ...) |
2658 | { | |
2659 | int ret; | |
2660 | va_list args; | |
2661 | va_start(args, fmt); | |
2662 | ret = trace_vprintk(0, fmt, args); | |
2663 | va_end(args); | |
2664 | return ret; | |
2665 | } | |
2666 | ||
2667 | static ssize_t | |
2668 | tracing_mark_write(struct file *filp, const char __user *ubuf, | |
2669 | size_t cnt, loff_t *fpos) | |
2670 | { | |
2671 | char *buf; | |
2672 | char *end; | |
2673 | struct trace_array *tr = &global_trace; | |
2674 | ||
43a15386 | 2675 | if (!tr->ctrl || tracing_disabled) |
5bf9a1ee PP |
2676 | return -EINVAL; |
2677 | ||
2678 | if (cnt > TRACE_BUF_SIZE) | |
2679 | cnt = TRACE_BUF_SIZE; | |
2680 | ||
2681 | buf = kmalloc(cnt + 1, GFP_KERNEL); | |
2682 | if (buf == NULL) | |
2683 | return -ENOMEM; | |
2684 | ||
2685 | if (copy_from_user(buf, ubuf, cnt)) { | |
2686 | kfree(buf); | |
2687 | return -EFAULT; | |
2688 | } | |
2689 | ||
2690 | /* Cut from the first nil or newline. */ | |
2691 | buf[cnt] = '\0'; | |
2692 | end = strchr(buf, '\n'); | |
2693 | if (end) | |
2694 | *end = '\0'; | |
2695 | ||
2696 | cnt = mark_printk("%s\n", buf); | |
2697 | kfree(buf); | |
2698 | *fpos += cnt; | |
2699 | ||
2700 | return cnt; | |
2701 | } | |
2702 | ||
bc0c38d1 | 2703 | static struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
2704 | .open = tracing_open_generic, |
2705 | .read = tracing_max_lat_read, | |
2706 | .write = tracing_max_lat_write, | |
bc0c38d1 SR |
2707 | }; |
2708 | ||
2709 | static struct file_operations tracing_ctrl_fops = { | |
4bf39a94 IM |
2710 | .open = tracing_open_generic, |
2711 | .read = tracing_ctrl_read, | |
2712 | .write = tracing_ctrl_write, | |
bc0c38d1 SR |
2713 | }; |
2714 | ||
2715 | static struct file_operations set_tracer_fops = { | |
4bf39a94 IM |
2716 | .open = tracing_open_generic, |
2717 | .read = tracing_set_trace_read, | |
2718 | .write = tracing_set_trace_write, | |
bc0c38d1 SR |
2719 | }; |
2720 | ||
b3806b43 | 2721 | static struct file_operations tracing_pipe_fops = { |
4bf39a94 | 2722 | .open = tracing_open_pipe, |
2a2cc8f7 | 2723 | .poll = tracing_poll_pipe, |
4bf39a94 IM |
2724 | .read = tracing_read_pipe, |
2725 | .release = tracing_release_pipe, | |
b3806b43 SR |
2726 | }; |
2727 | ||
a98a3c3f SR |
2728 | static struct file_operations tracing_entries_fops = { |
2729 | .open = tracing_open_generic, | |
2730 | .read = tracing_entries_read, | |
2731 | .write = tracing_entries_write, | |
2732 | }; | |
2733 | ||
5bf9a1ee | 2734 | static struct file_operations tracing_mark_fops = { |
43a15386 | 2735 | .open = tracing_open_generic, |
5bf9a1ee PP |
2736 | .write = tracing_mark_write, |
2737 | }; | |
2738 | ||
bc0c38d1 SR |
2739 | #ifdef CONFIG_DYNAMIC_FTRACE |
2740 | ||
2741 | static ssize_t | |
2742 | tracing_read_long(struct file *filp, char __user *ubuf, | |
2743 | size_t cnt, loff_t *ppos) | |
2744 | { | |
2745 | unsigned long *p = filp->private_data; | |
2746 | char buf[64]; | |
2747 | int r; | |
2748 | ||
2749 | r = sprintf(buf, "%ld\n", *p); | |
4bf39a94 IM |
2750 | |
2751 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
bc0c38d1 SR |
2752 | } |
2753 | ||
2754 | static struct file_operations tracing_read_long_fops = { | |
4bf39a94 IM |
2755 | .open = tracing_open_generic, |
2756 | .read = tracing_read_long, | |
bc0c38d1 SR |
2757 | }; |
2758 | #endif | |
2759 | ||
2760 | static struct dentry *d_tracer; | |
2761 | ||
2762 | struct dentry *tracing_init_dentry(void) | |
2763 | { | |
2764 | static int once; | |
2765 | ||
2766 | if (d_tracer) | |
2767 | return d_tracer; | |
2768 | ||
2769 | d_tracer = debugfs_create_dir("tracing", NULL); | |
2770 | ||
2771 | if (!d_tracer && !once) { | |
2772 | once = 1; | |
2773 | pr_warning("Could not create debugfs directory 'tracing'\n"); | |
2774 | return NULL; | |
2775 | } | |
2776 | ||
2777 | return d_tracer; | |
2778 | } | |
2779 | ||
60a11774 SR |
2780 | #ifdef CONFIG_FTRACE_SELFTEST |
2781 | /* Let selftest have access to static functions in this file */ | |
2782 | #include "trace_selftest.c" | |
2783 | #endif | |
2784 | ||
b5ad384e | 2785 | static __init int tracer_init_debugfs(void) |
bc0c38d1 SR |
2786 | { |
2787 | struct dentry *d_tracer; | |
2788 | struct dentry *entry; | |
2789 | ||
2790 | d_tracer = tracing_init_dentry(); | |
2791 | ||
2792 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, | |
2793 | &global_trace, &tracing_ctrl_fops); | |
2794 | if (!entry) | |
2795 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); | |
2796 | ||
2797 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, | |
2798 | NULL, &tracing_iter_fops); | |
2799 | if (!entry) | |
2800 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); | |
2801 | ||
c7078de1 IM |
2802 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
2803 | NULL, &tracing_cpumask_fops); | |
2804 | if (!entry) | |
2805 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); | |
2806 | ||
bc0c38d1 SR |
2807 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
2808 | &global_trace, &tracing_lt_fops); | |
2809 | if (!entry) | |
2810 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); | |
2811 | ||
2812 | entry = debugfs_create_file("trace", 0444, d_tracer, | |
2813 | &global_trace, &tracing_fops); | |
2814 | if (!entry) | |
2815 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2816 | ||
2817 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, | |
2818 | &global_trace, &show_traces_fops); | |
2819 | if (!entry) | |
98a983aa | 2820 | pr_warning("Could not create debugfs 'available_tracers' entry\n"); |
bc0c38d1 SR |
2821 | |
2822 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, | |
2823 | &global_trace, &set_tracer_fops); | |
2824 | if (!entry) | |
98a983aa | 2825 | pr_warning("Could not create debugfs 'current_tracer' entry\n"); |
bc0c38d1 SR |
2826 | |
2827 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, | |
2828 | &tracing_max_latency, | |
2829 | &tracing_max_lat_fops); | |
2830 | if (!entry) | |
2831 | pr_warning("Could not create debugfs " | |
2832 | "'tracing_max_latency' entry\n"); | |
2833 | ||
2834 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, | |
2835 | &tracing_thresh, &tracing_max_lat_fops); | |
2836 | if (!entry) | |
2837 | pr_warning("Could not create debugfs " | |
98a983aa | 2838 | "'tracing_thresh' entry\n"); |
7bd2f24c IM |
2839 | entry = debugfs_create_file("README", 0644, d_tracer, |
2840 | NULL, &tracing_readme_fops); | |
2841 | if (!entry) | |
2842 | pr_warning("Could not create debugfs 'README' entry\n"); | |
2843 | ||
b3806b43 SR |
2844 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
2845 | NULL, &tracing_pipe_fops); | |
2846 | if (!entry) | |
2847 | pr_warning("Could not create debugfs " | |
98a983aa | 2848 | "'trace_pipe' entry\n"); |
bc0c38d1 | 2849 | |
a98a3c3f SR |
2850 | entry = debugfs_create_file("trace_entries", 0644, d_tracer, |
2851 | &global_trace, &tracing_entries_fops); | |
2852 | if (!entry) | |
2853 | pr_warning("Could not create debugfs " | |
98a983aa | 2854 | "'trace_entries' entry\n"); |
a98a3c3f | 2855 | |
5bf9a1ee PP |
2856 | entry = debugfs_create_file("trace_marker", 0220, d_tracer, |
2857 | NULL, &tracing_mark_fops); | |
2858 | if (!entry) | |
2859 | pr_warning("Could not create debugfs " | |
2860 | "'trace_marker' entry\n"); | |
2861 | ||
bc0c38d1 SR |
2862 | #ifdef CONFIG_DYNAMIC_FTRACE |
2863 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, | |
2864 | &ftrace_update_tot_cnt, | |
2865 | &tracing_read_long_fops); | |
2866 | if (!entry) | |
2867 | pr_warning("Could not create debugfs " | |
2868 | "'dyn_ftrace_total_info' entry\n"); | |
2869 | #endif | |
d618b3e6 IM |
2870 | #ifdef CONFIG_SYSPROF_TRACER |
2871 | init_tracer_sysprof_debugfs(d_tracer); | |
2872 | #endif | |
b5ad384e | 2873 | return 0; |
bc0c38d1 SR |
2874 | } |
2875 | ||
801fe400 | 2876 | int trace_vprintk(unsigned long ip, const char *fmt, va_list args) |
dd0e545f | 2877 | { |
dd0e545f SR |
2878 | static DEFINE_SPINLOCK(trace_buf_lock); |
2879 | static char trace_buf[TRACE_BUF_SIZE]; | |
f09ce573 | 2880 | |
3928a8a2 | 2881 | struct ring_buffer_event *event; |
f09ce573 | 2882 | struct trace_array *tr = &global_trace; |
dd0e545f | 2883 | struct trace_array_cpu *data; |
777e208d | 2884 | struct print_entry *entry; |
3928a8a2 | 2885 | unsigned long flags, irq_flags; |
dd0e545f | 2886 | long disabled; |
777e208d | 2887 | int cpu, len = 0, size; |
dd0e545f | 2888 | |
43a15386 | 2889 | if (!tr->ctrl || tracing_disabled) |
dd0e545f SR |
2890 | return 0; |
2891 | ||
2892 | local_irq_save(flags); | |
2893 | cpu = raw_smp_processor_id(); | |
2894 | data = tr->data[cpu]; | |
2895 | disabled = atomic_inc_return(&data->disabled); | |
2896 | ||
f09ce573 | 2897 | if (unlikely(disabled != 1)) |
dd0e545f SR |
2898 | goto out; |
2899 | ||
2900 | spin_lock(&trace_buf_lock); | |
801fe400 | 2901 | len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args); |
dd0e545f SR |
2902 | |
2903 | len = min(len, TRACE_BUF_SIZE-1); | |
2904 | trace_buf[len] = 0; | |
2905 | ||
777e208d SR |
2906 | size = sizeof(*entry) + len + 1; |
2907 | event = ring_buffer_lock_reserve(tr->buffer, size, &irq_flags); | |
3928a8a2 SR |
2908 | if (!event) |
2909 | goto out_unlock; | |
777e208d SR |
2910 | entry = ring_buffer_event_data(event); |
2911 | tracing_generic_entry_update(&entry->ent, flags); | |
2912 | entry->ent.type = TRACE_PRINT; | |
2913 | entry->ip = ip; | |
dd0e545f | 2914 | |
777e208d SR |
2915 | memcpy(&entry->buf, trace_buf, len); |
2916 | entry->buf[len] = 0; | |
3928a8a2 | 2917 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
dd0e545f | 2918 | |
3928a8a2 | 2919 | out_unlock: |
dd0e545f SR |
2920 | spin_unlock(&trace_buf_lock); |
2921 | ||
2922 | out: | |
2923 | atomic_dec(&data->disabled); | |
2924 | local_irq_restore(flags); | |
2925 | ||
2926 | return len; | |
2927 | } | |
801fe400 PP |
2928 | EXPORT_SYMBOL_GPL(trace_vprintk); |
2929 | ||
2930 | int __ftrace_printk(unsigned long ip, const char *fmt, ...) | |
2931 | { | |
2932 | int ret; | |
2933 | va_list ap; | |
2934 | ||
2935 | if (!(trace_flags & TRACE_ITER_PRINTK)) | |
2936 | return 0; | |
2937 | ||
2938 | va_start(ap, fmt); | |
2939 | ret = trace_vprintk(ip, fmt, ap); | |
2940 | va_end(ap); | |
2941 | return ret; | |
2942 | } | |
dd0e545f SR |
2943 | EXPORT_SYMBOL_GPL(__ftrace_printk); |
2944 | ||
3f5a54e3 SR |
2945 | static int trace_panic_handler(struct notifier_block *this, |
2946 | unsigned long event, void *unused) | |
2947 | { | |
2948 | ftrace_dump(); | |
2949 | return NOTIFY_OK; | |
2950 | } | |
2951 | ||
2952 | static struct notifier_block trace_panic_notifier = { | |
2953 | .notifier_call = trace_panic_handler, | |
2954 | .next = NULL, | |
2955 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ | |
2956 | }; | |
2957 | ||
2958 | static int trace_die_handler(struct notifier_block *self, | |
2959 | unsigned long val, | |
2960 | void *data) | |
2961 | { | |
2962 | switch (val) { | |
2963 | case DIE_OOPS: | |
2964 | ftrace_dump(); | |
2965 | break; | |
2966 | default: | |
2967 | break; | |
2968 | } | |
2969 | return NOTIFY_OK; | |
2970 | } | |
2971 | ||
2972 | static struct notifier_block trace_die_notifier = { | |
2973 | .notifier_call = trace_die_handler, | |
2974 | .priority = 200 | |
2975 | }; | |
2976 | ||
2977 | /* | |
2978 | * printk is set to max of 1024, we really don't need it that big. | |
2979 | * Nothing should be printing 1000 characters anyway. | |
2980 | */ | |
2981 | #define TRACE_MAX_PRINT 1000 | |
2982 | ||
2983 | /* | |
2984 | * Define here KERN_TRACE so that we have one place to modify | |
2985 | * it if we decide to change what log level the ftrace dump | |
2986 | * should be at. | |
2987 | */ | |
2988 | #define KERN_TRACE KERN_INFO | |
2989 | ||
2990 | static void | |
2991 | trace_printk_seq(struct trace_seq *s) | |
2992 | { | |
2993 | /* Probably should print a warning here. */ | |
2994 | if (s->len >= 1000) | |
2995 | s->len = 1000; | |
2996 | ||
2997 | /* should be zero ended, but we are paranoid. */ | |
2998 | s->buffer[s->len] = 0; | |
2999 | ||
3000 | printk(KERN_TRACE "%s", s->buffer); | |
3001 | ||
3002 | trace_seq_reset(s); | |
3003 | } | |
3004 | ||
3005 | ||
3006 | void ftrace_dump(void) | |
3007 | { | |
3008 | static DEFINE_SPINLOCK(ftrace_dump_lock); | |
3009 | /* use static because iter can be a bit big for the stack */ | |
3010 | static struct trace_iterator iter; | |
3f5a54e3 SR |
3011 | static cpumask_t mask; |
3012 | static int dump_ran; | |
3928a8a2 | 3013 | unsigned long flags, irq_flags; |
3f5a54e3 | 3014 | int cnt = 0; |
3f5a54e3 SR |
3015 | |
3016 | /* only one dump */ | |
3017 | spin_lock_irqsave(&ftrace_dump_lock, flags); | |
3018 | if (dump_ran) | |
3019 | goto out; | |
3020 | ||
3021 | dump_ran = 1; | |
3022 | ||
3023 | /* No turning back! */ | |
3024 | ftrace_kill_atomic(); | |
3025 | ||
3026 | printk(KERN_TRACE "Dumping ftrace buffer:\n"); | |
3027 | ||
3028 | iter.tr = &global_trace; | |
3029 | iter.trace = current_trace; | |
3030 | ||
3031 | /* | |
3032 | * We need to stop all tracing on all CPUS to read the | |
3033 | * the next buffer. This is a bit expensive, but is | |
3034 | * not done often. We fill all what we can read, | |
3035 | * and then release the locks again. | |
3036 | */ | |
3037 | ||
3038 | cpus_clear(mask); | |
3039 | ||
3928a8a2 | 3040 | ring_buffer_lock(iter.tr->buffer, &irq_flags); |
3f5a54e3 SR |
3041 | |
3042 | while (!trace_empty(&iter)) { | |
3043 | ||
3044 | if (!cnt) | |
3045 | printk(KERN_TRACE "---------------------------------\n"); | |
3046 | ||
3047 | cnt++; | |
3048 | ||
3049 | /* reset all but tr, trace, and overruns */ | |
3050 | memset(&iter.seq, 0, | |
3051 | sizeof(struct trace_iterator) - | |
3052 | offsetof(struct trace_iterator, seq)); | |
3053 | iter.iter_flags |= TRACE_FILE_LAT_FMT; | |
3054 | iter.pos = -1; | |
3055 | ||
3056 | if (find_next_entry_inc(&iter) != NULL) { | |
3057 | print_trace_line(&iter); | |
3058 | trace_consume(&iter); | |
3059 | } | |
3060 | ||
3061 | trace_printk_seq(&iter.seq); | |
3062 | } | |
3063 | ||
3064 | if (!cnt) | |
3065 | printk(KERN_TRACE " (ftrace buffer empty)\n"); | |
3066 | else | |
3067 | printk(KERN_TRACE "---------------------------------\n"); | |
3068 | ||
3928a8a2 | 3069 | ring_buffer_unlock(iter.tr->buffer, irq_flags); |
3f5a54e3 SR |
3070 | |
3071 | out: | |
3072 | spin_unlock_irqrestore(&ftrace_dump_lock, flags); | |
3073 | } | |
3074 | ||
3928a8a2 | 3075 | __init static int tracer_alloc_buffers(void) |
bc0c38d1 | 3076 | { |
4c11d7ae | 3077 | struct trace_array_cpu *data; |
4c11d7ae SR |
3078 | int i; |
3079 | ||
3928a8a2 SR |
3080 | /* TODO: make the number of buffers hot pluggable with CPUS */ |
3081 | tracing_buffer_mask = cpu_possible_map; | |
4c11d7ae | 3082 | |
3928a8a2 SR |
3083 | global_trace.buffer = ring_buffer_alloc(trace_buf_size, |
3084 | TRACE_BUFFER_FLAGS); | |
3085 | if (!global_trace.buffer) { | |
3086 | printk(KERN_ERR "tracer: failed to allocate ring buffer!\n"); | |
3087 | WARN_ON(1); | |
3088 | return 0; | |
4c11d7ae | 3089 | } |
3928a8a2 | 3090 | global_trace.entries = ring_buffer_size(global_trace.buffer); |
4c11d7ae SR |
3091 | |
3092 | #ifdef CONFIG_TRACER_MAX_TRACE | |
3928a8a2 SR |
3093 | max_tr.buffer = ring_buffer_alloc(trace_buf_size, |
3094 | TRACE_BUFFER_FLAGS); | |
3095 | if (!max_tr.buffer) { | |
3096 | printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n"); | |
3097 | WARN_ON(1); | |
3098 | ring_buffer_free(global_trace.buffer); | |
3099 | return 0; | |
4c11d7ae | 3100 | } |
3928a8a2 SR |
3101 | max_tr.entries = ring_buffer_size(max_tr.buffer); |
3102 | WARN_ON(max_tr.entries != global_trace.entries); | |
a98a3c3f | 3103 | #endif |
ab46428c | 3104 | |
4c11d7ae | 3105 | /* Allocate the first page for all buffers */ |
ab46428c | 3106 | for_each_tracing_cpu(i) { |
4c11d7ae | 3107 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
bc0c38d1 | 3108 | max_tr.data[i] = &per_cpu(max_data, i); |
4c11d7ae | 3109 | } |
bc0c38d1 | 3110 | |
bc0c38d1 SR |
3111 | trace_init_cmdlines(); |
3112 | ||
43a15386 | 3113 | register_tracer(&nop_trace); |
b5ad384e FW |
3114 | #ifdef CONFIG_BOOT_TRACER |
3115 | register_tracer(&boot_tracer); | |
3116 | current_trace = &boot_tracer; | |
3117 | current_trace->init(&global_trace); | |
3118 | #else | |
43a15386 | 3119 | current_trace = &nop_trace; |
b5ad384e | 3120 | #endif |
bc0c38d1 | 3121 | |
60a11774 | 3122 | /* All seems OK, enable tracing */ |
4902f884 | 3123 | global_trace.ctrl = tracer_enabled; |
60a11774 | 3124 | tracing_disabled = 0; |
3928a8a2 | 3125 | |
3f5a54e3 SR |
3126 | atomic_notifier_chain_register(&panic_notifier_list, |
3127 | &trace_panic_notifier); | |
3128 | ||
3129 | register_die_notifier(&trace_die_notifier); | |
3130 | ||
bc0c38d1 | 3131 | return 0; |
bc0c38d1 | 3132 | } |
b5ad384e FW |
3133 | early_initcall(tracer_alloc_buffers); |
3134 | fs_initcall(tracer_init_debugfs); |