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Commit | Line | Data |
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bc0c38d1 SR |
1 | /* |
2 | * ring buffer based function tracer | |
3 | * | |
4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> | |
5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> | |
6 | * | |
7 | * Originally taken from the RT patch by: | |
8 | * Arnaldo Carvalho de Melo <acme@redhat.com> | |
9 | * | |
10 | * Based on code from the latency_tracer, that is: | |
11 | * Copyright (C) 2004-2006 Ingo Molnar | |
12 | * Copyright (C) 2004 William Lee Irwin III | |
13 | */ | |
14 | #include <linux/utsrelease.h> | |
15 | #include <linux/kallsyms.h> | |
16 | #include <linux/seq_file.h> | |
3f5a54e3 | 17 | #include <linux/notifier.h> |
bc0c38d1 | 18 | #include <linux/debugfs.h> |
4c11d7ae | 19 | #include <linux/pagemap.h> |
bc0c38d1 SR |
20 | #include <linux/hardirq.h> |
21 | #include <linux/linkage.h> | |
22 | #include <linux/uaccess.h> | |
23 | #include <linux/ftrace.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/percpu.h> | |
3f5a54e3 | 26 | #include <linux/kdebug.h> |
bc0c38d1 SR |
27 | #include <linux/ctype.h> |
28 | #include <linux/init.h> | |
2a2cc8f7 | 29 | #include <linux/poll.h> |
bc0c38d1 SR |
30 | #include <linux/gfp.h> |
31 | #include <linux/fs.h> | |
76094a2c | 32 | #include <linux/kprobes.h> |
b54d3de9 | 33 | #include <linux/seq_file.h> |
3eefae99 | 34 | #include <linux/writeback.h> |
bc0c38d1 | 35 | |
86387f7e | 36 | #include <linux/stacktrace.h> |
3928a8a2 | 37 | #include <linux/ring_buffer.h> |
21798a84 | 38 | #include <linux/irqflags.h> |
86387f7e | 39 | |
bc0c38d1 SR |
40 | #include "trace.h" |
41 | ||
3928a8a2 SR |
42 | #define TRACE_BUFFER_FLAGS (RB_FL_OVERWRITE) |
43 | ||
bc0c38d1 SR |
44 | unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX; |
45 | unsigned long __read_mostly tracing_thresh; | |
46 | ||
adf9f195 FW |
47 | /* For tracers that don't implement custom flags */ |
48 | static struct tracer_opt dummy_tracer_opt[] = { | |
49 | { } | |
50 | }; | |
51 | ||
52 | static struct tracer_flags dummy_tracer_flags = { | |
53 | .val = 0, | |
54 | .opts = dummy_tracer_opt | |
55 | }; | |
56 | ||
57 | static int dummy_set_flag(u32 old_flags, u32 bit, int set) | |
58 | { | |
59 | return 0; | |
60 | } | |
0f048701 SR |
61 | |
62 | /* | |
63 | * Kill all tracing for good (never come back). | |
64 | * It is initialized to 1 but will turn to zero if the initialization | |
65 | * of the tracer is successful. But that is the only place that sets | |
66 | * this back to zero. | |
67 | */ | |
68 | int tracing_disabled = 1; | |
69 | ||
d769041f SR |
70 | static DEFINE_PER_CPU(local_t, ftrace_cpu_disabled); |
71 | ||
72 | static inline void ftrace_disable_cpu(void) | |
73 | { | |
74 | preempt_disable(); | |
75 | local_inc(&__get_cpu_var(ftrace_cpu_disabled)); | |
76 | } | |
77 | ||
78 | static inline void ftrace_enable_cpu(void) | |
79 | { | |
80 | local_dec(&__get_cpu_var(ftrace_cpu_disabled)); | |
81 | preempt_enable(); | |
82 | } | |
83 | ||
ab46428c SR |
84 | static cpumask_t __read_mostly tracing_buffer_mask; |
85 | ||
86 | #define for_each_tracing_cpu(cpu) \ | |
87 | for_each_cpu_mask(cpu, tracing_buffer_mask) | |
88 | ||
944ac425 SR |
89 | /* |
90 | * ftrace_dump_on_oops - variable to dump ftrace buffer on oops | |
91 | * | |
92 | * If there is an oops (or kernel panic) and the ftrace_dump_on_oops | |
93 | * is set, then ftrace_dump is called. This will output the contents | |
94 | * of the ftrace buffers to the console. This is very useful for | |
95 | * capturing traces that lead to crashes and outputing it to a | |
96 | * serial console. | |
97 | * | |
98 | * It is default off, but you can enable it with either specifying | |
99 | * "ftrace_dump_on_oops" in the kernel command line, or setting | |
100 | * /proc/sys/kernel/ftrace_dump_on_oops to true. | |
101 | */ | |
102 | int ftrace_dump_on_oops; | |
103 | ||
d9e54076 PZ |
104 | static int tracing_set_tracer(char *buf); |
105 | ||
106 | static int __init set_ftrace(char *str) | |
107 | { | |
108 | tracing_set_tracer(str); | |
109 | return 1; | |
110 | } | |
111 | __setup("ftrace", set_ftrace); | |
112 | ||
944ac425 SR |
113 | static int __init set_ftrace_dump_on_oops(char *str) |
114 | { | |
115 | ftrace_dump_on_oops = 1; | |
116 | return 1; | |
117 | } | |
118 | __setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops); | |
119 | ||
72829bc3 | 120 | long |
bc0c38d1 SR |
121 | ns2usecs(cycle_t nsec) |
122 | { | |
123 | nsec += 500; | |
124 | do_div(nsec, 1000); | |
125 | return nsec; | |
126 | } | |
127 | ||
e309b41d | 128 | cycle_t ftrace_now(int cpu) |
750ed1a4 | 129 | { |
3928a8a2 SR |
130 | u64 ts = ring_buffer_time_stamp(cpu); |
131 | ring_buffer_normalize_time_stamp(cpu, &ts); | |
132 | return ts; | |
750ed1a4 IM |
133 | } |
134 | ||
4fcdae83 SR |
135 | /* |
136 | * The global_trace is the descriptor that holds the tracing | |
137 | * buffers for the live tracing. For each CPU, it contains | |
138 | * a link list of pages that will store trace entries. The | |
139 | * page descriptor of the pages in the memory is used to hold | |
140 | * the link list by linking the lru item in the page descriptor | |
141 | * to each of the pages in the buffer per CPU. | |
142 | * | |
143 | * For each active CPU there is a data field that holds the | |
144 | * pages for the buffer for that CPU. Each CPU has the same number | |
145 | * of pages allocated for its buffer. | |
146 | */ | |
bc0c38d1 SR |
147 | static struct trace_array global_trace; |
148 | ||
149 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); | |
150 | ||
4fcdae83 SR |
151 | /* |
152 | * The max_tr is used to snapshot the global_trace when a maximum | |
153 | * latency is reached. Some tracers will use this to store a maximum | |
154 | * trace while it continues examining live traces. | |
155 | * | |
156 | * The buffers for the max_tr are set up the same as the global_trace. | |
157 | * When a snapshot is taken, the link list of the max_tr is swapped | |
158 | * with the link list of the global_trace and the buffers are reset for | |
159 | * the global_trace so the tracing can continue. | |
160 | */ | |
bc0c38d1 SR |
161 | static struct trace_array max_tr; |
162 | ||
163 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); | |
164 | ||
4fcdae83 | 165 | /* tracer_enabled is used to toggle activation of a tracer */ |
26994ead | 166 | static int tracer_enabled = 1; |
4fcdae83 | 167 | |
9036990d SR |
168 | /** |
169 | * tracing_is_enabled - return tracer_enabled status | |
170 | * | |
171 | * This function is used by other tracers to know the status | |
172 | * of the tracer_enabled flag. Tracers may use this function | |
173 | * to know if it should enable their features when starting | |
174 | * up. See irqsoff tracer for an example (start_irqsoff_tracer). | |
175 | */ | |
176 | int tracing_is_enabled(void) | |
177 | { | |
178 | return tracer_enabled; | |
179 | } | |
180 | ||
60bc0800 SR |
181 | /* function tracing enabled */ |
182 | int ftrace_function_enabled; | |
183 | ||
4fcdae83 | 184 | /* |
3928a8a2 SR |
185 | * trace_buf_size is the size in bytes that is allocated |
186 | * for a buffer. Note, the number of bytes is always rounded | |
187 | * to page size. | |
3f5a54e3 SR |
188 | * |
189 | * This number is purposely set to a low number of 16384. | |
190 | * If the dump on oops happens, it will be much appreciated | |
191 | * to not have to wait for all that output. Anyway this can be | |
192 | * boot time and run time configurable. | |
4fcdae83 | 193 | */ |
3928a8a2 | 194 | #define TRACE_BUF_SIZE_DEFAULT 1441792UL /* 16384 * 88 (sizeof(entry)) */ |
3f5a54e3 | 195 | |
3928a8a2 | 196 | static unsigned long trace_buf_size = TRACE_BUF_SIZE_DEFAULT; |
bc0c38d1 | 197 | |
4fcdae83 | 198 | /* trace_types holds a link list of available tracers. */ |
bc0c38d1 | 199 | static struct tracer *trace_types __read_mostly; |
4fcdae83 SR |
200 | |
201 | /* current_trace points to the tracer that is currently active */ | |
bc0c38d1 | 202 | static struct tracer *current_trace __read_mostly; |
4fcdae83 SR |
203 | |
204 | /* | |
205 | * max_tracer_type_len is used to simplify the allocating of | |
206 | * buffers to read userspace tracer names. We keep track of | |
207 | * the longest tracer name registered. | |
208 | */ | |
bc0c38d1 SR |
209 | static int max_tracer_type_len; |
210 | ||
4fcdae83 SR |
211 | /* |
212 | * trace_types_lock is used to protect the trace_types list. | |
213 | * This lock is also used to keep user access serialized. | |
214 | * Accesses from userspace will grab this lock while userspace | |
215 | * activities happen inside the kernel. | |
216 | */ | |
bc0c38d1 | 217 | static DEFINE_MUTEX(trace_types_lock); |
4fcdae83 SR |
218 | |
219 | /* trace_wait is a waitqueue for tasks blocked on trace_poll */ | |
4e655519 IM |
220 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
221 | ||
ee6bce52 | 222 | /* trace_flags holds trace_options default values */ |
12ef7d44 SR |
223 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK | |
224 | TRACE_ITER_ANNOTATE; | |
4e655519 | 225 | |
4fcdae83 SR |
226 | /** |
227 | * trace_wake_up - wake up tasks waiting for trace input | |
228 | * | |
229 | * Simply wakes up any task that is blocked on the trace_wait | |
230 | * queue. These is used with trace_poll for tasks polling the trace. | |
231 | */ | |
4e655519 IM |
232 | void trace_wake_up(void) |
233 | { | |
017730c1 IM |
234 | /* |
235 | * The runqueue_is_locked() can fail, but this is the best we | |
236 | * have for now: | |
237 | */ | |
238 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) | |
4e655519 IM |
239 | wake_up(&trace_wait); |
240 | } | |
bc0c38d1 | 241 | |
3928a8a2 | 242 | static int __init set_buf_size(char *str) |
bc0c38d1 | 243 | { |
3928a8a2 | 244 | unsigned long buf_size; |
c6caeeb1 SR |
245 | int ret; |
246 | ||
bc0c38d1 SR |
247 | if (!str) |
248 | return 0; | |
3928a8a2 | 249 | ret = strict_strtoul(str, 0, &buf_size); |
c6caeeb1 | 250 | /* nr_entries can not be zero */ |
3928a8a2 | 251 | if (ret < 0 || buf_size == 0) |
c6caeeb1 | 252 | return 0; |
3928a8a2 | 253 | trace_buf_size = buf_size; |
bc0c38d1 SR |
254 | return 1; |
255 | } | |
3928a8a2 | 256 | __setup("trace_buf_size=", set_buf_size); |
bc0c38d1 | 257 | |
57f50be1 SR |
258 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
259 | { | |
260 | return nsecs / 1000; | |
261 | } | |
262 | ||
4fcdae83 | 263 | /* These must match the bit postions in trace_iterator_flags */ |
bc0c38d1 SR |
264 | static const char *trace_options[] = { |
265 | "print-parent", | |
266 | "sym-offset", | |
267 | "sym-addr", | |
268 | "verbose", | |
f9896bf3 | 269 | "raw", |
5e3ca0ec | 270 | "hex", |
cb0f12aa | 271 | "bin", |
2a2cc8f7 | 272 | "block", |
86387f7e | 273 | "stacktrace", |
4ac3ba41 | 274 | "sched-tree", |
f09ce573 | 275 | "ftrace_printk", |
b2a866f9 | 276 | "ftrace_preempt", |
9f029e83 | 277 | "branch", |
12ef7d44 | 278 | "annotate", |
02b67518 | 279 | "userstacktrace", |
b54d3de9 | 280 | "sym-userobj", |
bc0c38d1 SR |
281 | NULL |
282 | }; | |
283 | ||
4fcdae83 SR |
284 | /* |
285 | * ftrace_max_lock is used to protect the swapping of buffers | |
286 | * when taking a max snapshot. The buffers themselves are | |
287 | * protected by per_cpu spinlocks. But the action of the swap | |
288 | * needs its own lock. | |
289 | * | |
290 | * This is defined as a raw_spinlock_t in order to help | |
291 | * with performance when lockdep debugging is enabled. | |
292 | */ | |
92205c23 SR |
293 | static raw_spinlock_t ftrace_max_lock = |
294 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; | |
bc0c38d1 SR |
295 | |
296 | /* | |
297 | * Copy the new maximum trace into the separate maximum-trace | |
298 | * structure. (this way the maximum trace is permanently saved, | |
299 | * for later retrieval via /debugfs/tracing/latency_trace) | |
300 | */ | |
e309b41d | 301 | static void |
bc0c38d1 SR |
302 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
303 | { | |
304 | struct trace_array_cpu *data = tr->data[cpu]; | |
305 | ||
306 | max_tr.cpu = cpu; | |
307 | max_tr.time_start = data->preempt_timestamp; | |
308 | ||
309 | data = max_tr.data[cpu]; | |
310 | data->saved_latency = tracing_max_latency; | |
311 | ||
312 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); | |
313 | data->pid = tsk->pid; | |
314 | data->uid = tsk->uid; | |
315 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; | |
316 | data->policy = tsk->policy; | |
317 | data->rt_priority = tsk->rt_priority; | |
318 | ||
319 | /* record this tasks comm */ | |
320 | tracing_record_cmdline(current); | |
321 | } | |
322 | ||
4fcdae83 SR |
323 | /** |
324 | * trace_seq_printf - sequence printing of trace information | |
325 | * @s: trace sequence descriptor | |
326 | * @fmt: printf format string | |
327 | * | |
328 | * The tracer may use either sequence operations or its own | |
329 | * copy to user routines. To simplify formating of a trace | |
330 | * trace_seq_printf is used to store strings into a special | |
331 | * buffer (@s). Then the output may be either used by | |
332 | * the sequencer or pulled into another buffer. | |
333 | */ | |
72829bc3 | 334 | int |
214023c3 SR |
335 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
336 | { | |
337 | int len = (PAGE_SIZE - 1) - s->len; | |
338 | va_list ap; | |
b3806b43 | 339 | int ret; |
214023c3 SR |
340 | |
341 | if (!len) | |
342 | return 0; | |
343 | ||
344 | va_start(ap, fmt); | |
b3806b43 | 345 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
214023c3 SR |
346 | va_end(ap); |
347 | ||
b3806b43 | 348 | /* If we can't write it all, don't bother writing anything */ |
72829bc3 | 349 | if (ret >= len) |
b3806b43 SR |
350 | return 0; |
351 | ||
352 | s->len += ret; | |
214023c3 SR |
353 | |
354 | return len; | |
355 | } | |
356 | ||
4fcdae83 SR |
357 | /** |
358 | * trace_seq_puts - trace sequence printing of simple string | |
359 | * @s: trace sequence descriptor | |
360 | * @str: simple string to record | |
361 | * | |
362 | * The tracer may use either the sequence operations or its own | |
363 | * copy to user routines. This function records a simple string | |
364 | * into a special buffer (@s) for later retrieval by a sequencer | |
365 | * or other mechanism. | |
366 | */ | |
e309b41d | 367 | static int |
214023c3 SR |
368 | trace_seq_puts(struct trace_seq *s, const char *str) |
369 | { | |
370 | int len = strlen(str); | |
371 | ||
372 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
b3806b43 | 373 | return 0; |
214023c3 SR |
374 | |
375 | memcpy(s->buffer + s->len, str, len); | |
376 | s->len += len; | |
377 | ||
378 | return len; | |
379 | } | |
380 | ||
e309b41d | 381 | static int |
214023c3 SR |
382 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
383 | { | |
384 | if (s->len >= (PAGE_SIZE - 1)) | |
385 | return 0; | |
386 | ||
387 | s->buffer[s->len++] = c; | |
388 | ||
389 | return 1; | |
390 | } | |
391 | ||
e309b41d | 392 | static int |
cb0f12aa IM |
393 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
394 | { | |
395 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
396 | return 0; | |
397 | ||
398 | memcpy(s->buffer + s->len, mem, len); | |
399 | s->len += len; | |
400 | ||
401 | return len; | |
402 | } | |
403 | ||
ad0a3b68 HH |
404 | #define MAX_MEMHEX_BYTES 8 |
405 | #define HEX_CHARS (MAX_MEMHEX_BYTES*2 + 1) | |
5e3ca0ec | 406 | |
e309b41d | 407 | static int |
5e3ca0ec IM |
408 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
409 | { | |
410 | unsigned char hex[HEX_CHARS]; | |
93dcc6ea | 411 | unsigned char *data = mem; |
5e3ca0ec IM |
412 | int i, j; |
413 | ||
5e3ca0ec IM |
414 | #ifdef __BIG_ENDIAN |
415 | for (i = 0, j = 0; i < len; i++) { | |
416 | #else | |
417 | for (i = len-1, j = 0; i >= 0; i--) { | |
418 | #endif | |
2fbc4749 HH |
419 | hex[j++] = hex_asc_hi(data[i]); |
420 | hex[j++] = hex_asc_lo(data[i]); | |
5e3ca0ec | 421 | } |
93dcc6ea | 422 | hex[j++] = ' '; |
5e3ca0ec IM |
423 | |
424 | return trace_seq_putmem(s, hex, j); | |
425 | } | |
426 | ||
b54d3de9 TE |
427 | static int |
428 | trace_seq_path(struct trace_seq *s, struct path *path) | |
429 | { | |
430 | unsigned char *p; | |
431 | ||
432 | if (s->len >= (PAGE_SIZE - 1)) | |
433 | return 0; | |
434 | p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len); | |
435 | if (!IS_ERR(p)) { | |
436 | p = mangle_path(s->buffer + s->len, p, "\n"); | |
437 | if (p) { | |
438 | s->len = p - s->buffer; | |
439 | return 1; | |
440 | } | |
441 | } else { | |
442 | s->buffer[s->len++] = '?'; | |
443 | return 1; | |
444 | } | |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
e309b41d | 449 | static void |
214023c3 SR |
450 | trace_seq_reset(struct trace_seq *s) |
451 | { | |
452 | s->len = 0; | |
6c6c2796 PP |
453 | s->readpos = 0; |
454 | } | |
455 | ||
456 | ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) | |
457 | { | |
458 | int len; | |
459 | int ret; | |
460 | ||
461 | if (s->len <= s->readpos) | |
462 | return -EBUSY; | |
463 | ||
464 | len = s->len - s->readpos; | |
465 | if (cnt > len) | |
466 | cnt = len; | |
467 | ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); | |
468 | if (ret) | |
469 | return -EFAULT; | |
470 | ||
471 | s->readpos += len; | |
472 | return cnt; | |
214023c3 SR |
473 | } |
474 | ||
e309b41d | 475 | static void |
214023c3 SR |
476 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
477 | { | |
478 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; | |
479 | ||
480 | s->buffer[len] = 0; | |
481 | seq_puts(m, s->buffer); | |
482 | ||
483 | trace_seq_reset(s); | |
484 | } | |
485 | ||
4fcdae83 SR |
486 | /** |
487 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr | |
488 | * @tr: tracer | |
489 | * @tsk: the task with the latency | |
490 | * @cpu: The cpu that initiated the trace. | |
491 | * | |
492 | * Flip the buffers between the @tr and the max_tr and record information | |
493 | * about which task was the cause of this latency. | |
494 | */ | |
e309b41d | 495 | void |
bc0c38d1 SR |
496 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
497 | { | |
3928a8a2 | 498 | struct ring_buffer *buf = tr->buffer; |
bc0c38d1 | 499 | |
4c11d7ae | 500 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 501 | __raw_spin_lock(&ftrace_max_lock); |
3928a8a2 SR |
502 | |
503 | tr->buffer = max_tr.buffer; | |
504 | max_tr.buffer = buf; | |
505 | ||
d769041f | 506 | ftrace_disable_cpu(); |
3928a8a2 | 507 | ring_buffer_reset(tr->buffer); |
d769041f | 508 | ftrace_enable_cpu(); |
bc0c38d1 SR |
509 | |
510 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 511 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
512 | } |
513 | ||
514 | /** | |
515 | * update_max_tr_single - only copy one trace over, and reset the rest | |
516 | * @tr - tracer | |
517 | * @tsk - task with the latency | |
518 | * @cpu - the cpu of the buffer to copy. | |
4fcdae83 SR |
519 | * |
520 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. | |
bc0c38d1 | 521 | */ |
e309b41d | 522 | void |
bc0c38d1 SR |
523 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
524 | { | |
3928a8a2 | 525 | int ret; |
bc0c38d1 | 526 | |
4c11d7ae | 527 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 528 | __raw_spin_lock(&ftrace_max_lock); |
bc0c38d1 | 529 | |
d769041f SR |
530 | ftrace_disable_cpu(); |
531 | ||
3928a8a2 SR |
532 | ring_buffer_reset(max_tr.buffer); |
533 | ret = ring_buffer_swap_cpu(max_tr.buffer, tr->buffer, cpu); | |
534 | ||
d769041f SR |
535 | ftrace_enable_cpu(); |
536 | ||
3928a8a2 | 537 | WARN_ON_ONCE(ret); |
bc0c38d1 SR |
538 | |
539 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 540 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
541 | } |
542 | ||
4fcdae83 SR |
543 | /** |
544 | * register_tracer - register a tracer with the ftrace system. | |
545 | * @type - the plugin for the tracer | |
546 | * | |
547 | * Register a new plugin tracer. | |
548 | */ | |
bc0c38d1 SR |
549 | int register_tracer(struct tracer *type) |
550 | { | |
551 | struct tracer *t; | |
552 | int len; | |
553 | int ret = 0; | |
554 | ||
555 | if (!type->name) { | |
556 | pr_info("Tracer must have a name\n"); | |
557 | return -1; | |
558 | } | |
559 | ||
86fa2f60 IM |
560 | /* |
561 | * When this gets called we hold the BKL which means that | |
562 | * preemption is disabled. Various trace selftests however | |
563 | * need to disable and enable preemption for successful tests. | |
564 | * So we drop the BKL here and grab it after the tests again. | |
565 | */ | |
566 | unlock_kernel(); | |
bc0c38d1 | 567 | mutex_lock(&trace_types_lock); |
86fa2f60 | 568 | |
bc0c38d1 SR |
569 | for (t = trace_types; t; t = t->next) { |
570 | if (strcmp(type->name, t->name) == 0) { | |
571 | /* already found */ | |
572 | pr_info("Trace %s already registered\n", | |
573 | type->name); | |
574 | ret = -1; | |
575 | goto out; | |
576 | } | |
577 | } | |
578 | ||
adf9f195 FW |
579 | if (!type->set_flag) |
580 | type->set_flag = &dummy_set_flag; | |
581 | if (!type->flags) | |
582 | type->flags = &dummy_tracer_flags; | |
583 | else | |
584 | if (!type->flags->opts) | |
585 | type->flags->opts = dummy_tracer_opt; | |
586 | ||
60a11774 SR |
587 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
588 | if (type->selftest) { | |
589 | struct tracer *saved_tracer = current_trace; | |
60a11774 | 590 | struct trace_array *tr = &global_trace; |
60a11774 SR |
591 | int i; |
592 | /* | |
593 | * Run a selftest on this tracer. | |
594 | * Here we reset the trace buffer, and set the current | |
595 | * tracer to be this tracer. The tracer can then run some | |
596 | * internal tracing to verify that everything is in order. | |
597 | * If we fail, we do not register this tracer. | |
598 | */ | |
86fa2f60 | 599 | for_each_tracing_cpu(i) |
3928a8a2 | 600 | tracing_reset(tr, i); |
86fa2f60 | 601 | |
60a11774 | 602 | current_trace = type; |
60a11774 SR |
603 | /* the test is responsible for initializing and enabling */ |
604 | pr_info("Testing tracer %s: ", type->name); | |
605 | ret = type->selftest(type, tr); | |
606 | /* the test is responsible for resetting too */ | |
607 | current_trace = saved_tracer; | |
60a11774 SR |
608 | if (ret) { |
609 | printk(KERN_CONT "FAILED!\n"); | |
610 | goto out; | |
611 | } | |
1d4db00a | 612 | /* Only reset on passing, to avoid touching corrupted buffers */ |
86fa2f60 | 613 | for_each_tracing_cpu(i) |
3928a8a2 | 614 | tracing_reset(tr, i); |
86fa2f60 | 615 | |
60a11774 SR |
616 | printk(KERN_CONT "PASSED\n"); |
617 | } | |
618 | #endif | |
619 | ||
bc0c38d1 SR |
620 | type->next = trace_types; |
621 | trace_types = type; | |
622 | len = strlen(type->name); | |
623 | if (len > max_tracer_type_len) | |
624 | max_tracer_type_len = len; | |
60a11774 | 625 | |
bc0c38d1 SR |
626 | out: |
627 | mutex_unlock(&trace_types_lock); | |
86fa2f60 | 628 | lock_kernel(); |
bc0c38d1 SR |
629 | |
630 | return ret; | |
631 | } | |
632 | ||
633 | void unregister_tracer(struct tracer *type) | |
634 | { | |
635 | struct tracer **t; | |
636 | int len; | |
637 | ||
638 | mutex_lock(&trace_types_lock); | |
639 | for (t = &trace_types; *t; t = &(*t)->next) { | |
640 | if (*t == type) | |
641 | goto found; | |
642 | } | |
643 | pr_info("Trace %s not registered\n", type->name); | |
644 | goto out; | |
645 | ||
646 | found: | |
647 | *t = (*t)->next; | |
648 | if (strlen(type->name) != max_tracer_type_len) | |
649 | goto out; | |
650 | ||
651 | max_tracer_type_len = 0; | |
652 | for (t = &trace_types; *t; t = &(*t)->next) { | |
653 | len = strlen((*t)->name); | |
654 | if (len > max_tracer_type_len) | |
655 | max_tracer_type_len = len; | |
656 | } | |
657 | out: | |
658 | mutex_unlock(&trace_types_lock); | |
659 | } | |
660 | ||
3928a8a2 | 661 | void tracing_reset(struct trace_array *tr, int cpu) |
bc0c38d1 | 662 | { |
d769041f | 663 | ftrace_disable_cpu(); |
3928a8a2 | 664 | ring_buffer_reset_cpu(tr->buffer, cpu); |
d769041f | 665 | ftrace_enable_cpu(); |
bc0c38d1 SR |
666 | } |
667 | ||
bc0c38d1 SR |
668 | #define SAVED_CMDLINES 128 |
669 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; | |
670 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; | |
671 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; | |
672 | static int cmdline_idx; | |
673 | static DEFINE_SPINLOCK(trace_cmdline_lock); | |
25b0b44a | 674 | |
25b0b44a SR |
675 | /* temporary disable recording */ |
676 | atomic_t trace_record_cmdline_disabled __read_mostly; | |
bc0c38d1 SR |
677 | |
678 | static void trace_init_cmdlines(void) | |
679 | { | |
680 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); | |
681 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); | |
682 | cmdline_idx = 0; | |
683 | } | |
684 | ||
0f048701 SR |
685 | static int trace_stop_count; |
686 | static DEFINE_SPINLOCK(tracing_start_lock); | |
687 | ||
69bb54ec SR |
688 | /** |
689 | * ftrace_off_permanent - disable all ftrace code permanently | |
690 | * | |
691 | * This should only be called when a serious anomally has | |
692 | * been detected. This will turn off the function tracing, | |
693 | * ring buffers, and other tracing utilites. It takes no | |
694 | * locks and can be called from any context. | |
695 | */ | |
696 | void ftrace_off_permanent(void) | |
697 | { | |
698 | tracing_disabled = 1; | |
699 | ftrace_stop(); | |
700 | tracing_off_permanent(); | |
701 | } | |
702 | ||
0f048701 SR |
703 | /** |
704 | * tracing_start - quick start of the tracer | |
705 | * | |
706 | * If tracing is enabled but was stopped by tracing_stop, | |
707 | * this will start the tracer back up. | |
708 | */ | |
709 | void tracing_start(void) | |
710 | { | |
711 | struct ring_buffer *buffer; | |
712 | unsigned long flags; | |
713 | ||
714 | if (tracing_disabled) | |
715 | return; | |
716 | ||
717 | spin_lock_irqsave(&tracing_start_lock, flags); | |
718 | if (--trace_stop_count) | |
719 | goto out; | |
720 | ||
721 | if (trace_stop_count < 0) { | |
722 | /* Someone screwed up their debugging */ | |
723 | WARN_ON_ONCE(1); | |
724 | trace_stop_count = 0; | |
725 | goto out; | |
726 | } | |
727 | ||
728 | ||
729 | buffer = global_trace.buffer; | |
730 | if (buffer) | |
731 | ring_buffer_record_enable(buffer); | |
732 | ||
733 | buffer = max_tr.buffer; | |
734 | if (buffer) | |
735 | ring_buffer_record_enable(buffer); | |
736 | ||
737 | ftrace_start(); | |
738 | out: | |
739 | spin_unlock_irqrestore(&tracing_start_lock, flags); | |
740 | } | |
741 | ||
742 | /** | |
743 | * tracing_stop - quick stop of the tracer | |
744 | * | |
745 | * Light weight way to stop tracing. Use in conjunction with | |
746 | * tracing_start. | |
747 | */ | |
748 | void tracing_stop(void) | |
749 | { | |
750 | struct ring_buffer *buffer; | |
751 | unsigned long flags; | |
752 | ||
753 | ftrace_stop(); | |
754 | spin_lock_irqsave(&tracing_start_lock, flags); | |
755 | if (trace_stop_count++) | |
756 | goto out; | |
757 | ||
758 | buffer = global_trace.buffer; | |
759 | if (buffer) | |
760 | ring_buffer_record_disable(buffer); | |
761 | ||
762 | buffer = max_tr.buffer; | |
763 | if (buffer) | |
764 | ring_buffer_record_disable(buffer); | |
765 | ||
766 | out: | |
767 | spin_unlock_irqrestore(&tracing_start_lock, flags); | |
768 | } | |
769 | ||
e309b41d | 770 | void trace_stop_cmdline_recording(void); |
bc0c38d1 | 771 | |
e309b41d | 772 | static void trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
773 | { |
774 | unsigned map; | |
775 | unsigned idx; | |
776 | ||
777 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
778 | return; | |
779 | ||
780 | /* | |
781 | * It's not the end of the world if we don't get | |
782 | * the lock, but we also don't want to spin | |
783 | * nor do we want to disable interrupts, | |
784 | * so if we miss here, then better luck next time. | |
785 | */ | |
786 | if (!spin_trylock(&trace_cmdline_lock)) | |
787 | return; | |
788 | ||
789 | idx = map_pid_to_cmdline[tsk->pid]; | |
790 | if (idx >= SAVED_CMDLINES) { | |
791 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; | |
792 | ||
793 | map = map_cmdline_to_pid[idx]; | |
794 | if (map <= PID_MAX_DEFAULT) | |
795 | map_pid_to_cmdline[map] = (unsigned)-1; | |
796 | ||
797 | map_pid_to_cmdline[tsk->pid] = idx; | |
798 | ||
799 | cmdline_idx = idx; | |
800 | } | |
801 | ||
802 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); | |
803 | ||
804 | spin_unlock(&trace_cmdline_lock); | |
805 | } | |
806 | ||
e309b41d | 807 | static char *trace_find_cmdline(int pid) |
bc0c38d1 SR |
808 | { |
809 | char *cmdline = "<...>"; | |
810 | unsigned map; | |
811 | ||
812 | if (!pid) | |
813 | return "<idle>"; | |
814 | ||
815 | if (pid > PID_MAX_DEFAULT) | |
816 | goto out; | |
817 | ||
818 | map = map_pid_to_cmdline[pid]; | |
819 | if (map >= SAVED_CMDLINES) | |
820 | goto out; | |
821 | ||
822 | cmdline = saved_cmdlines[map]; | |
823 | ||
824 | out: | |
825 | return cmdline; | |
826 | } | |
827 | ||
e309b41d | 828 | void tracing_record_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
829 | { |
830 | if (atomic_read(&trace_record_cmdline_disabled)) | |
831 | return; | |
832 | ||
833 | trace_save_cmdline(tsk); | |
834 | } | |
835 | ||
45dcd8b8 | 836 | void |
38697053 SR |
837 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags, |
838 | int pc) | |
bc0c38d1 SR |
839 | { |
840 | struct task_struct *tsk = current; | |
bc0c38d1 | 841 | |
777e208d SR |
842 | entry->preempt_count = pc & 0xff; |
843 | entry->pid = (tsk) ? tsk->pid : 0; | |
b54d3de9 | 844 | entry->tgid = (tsk) ? tsk->tgid : 0; |
777e208d | 845 | entry->flags = |
9244489a | 846 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT |
2e2ca155 | 847 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
9244489a SR |
848 | #else |
849 | TRACE_FLAG_IRQS_NOSUPPORT | | |
850 | #endif | |
bc0c38d1 SR |
851 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
852 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | | |
853 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); | |
854 | } | |
855 | ||
e309b41d | 856 | void |
6fb44b71 | 857 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
38697053 SR |
858 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
859 | int pc) | |
bc0c38d1 | 860 | { |
3928a8a2 | 861 | struct ring_buffer_event *event; |
777e208d | 862 | struct ftrace_entry *entry; |
dcb6308f | 863 | unsigned long irq_flags; |
bc0c38d1 | 864 | |
d769041f SR |
865 | /* If we are reading the ring buffer, don't trace */ |
866 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) | |
867 | return; | |
868 | ||
3928a8a2 SR |
869 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
870 | &irq_flags); | |
871 | if (!event) | |
872 | return; | |
873 | entry = ring_buffer_event_data(event); | |
38697053 | 874 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
875 | entry->ent.type = TRACE_FN; |
876 | entry->ip = ip; | |
877 | entry->parent_ip = parent_ip; | |
3928a8a2 | 878 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
bc0c38d1 SR |
879 | } |
880 | ||
fb52607a FW |
881 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
882 | static void __trace_function_graph(struct trace_array *tr, | |
15e6cb36 | 883 | struct trace_array_cpu *data, |
fb52607a | 884 | struct ftrace_graph_ret *trace, |
15e6cb36 FW |
885 | unsigned long flags, |
886 | int pc) | |
887 | { | |
888 | struct ring_buffer_event *event; | |
fb52607a | 889 | struct ftrace_graph_entry *entry; |
15e6cb36 FW |
890 | unsigned long irq_flags; |
891 | ||
892 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) | |
893 | return; | |
894 | ||
895 | event = ring_buffer_lock_reserve(global_trace.buffer, sizeof(*entry), | |
896 | &irq_flags); | |
897 | if (!event) | |
898 | return; | |
899 | entry = ring_buffer_event_data(event); | |
900 | tracing_generic_entry_update(&entry->ent, flags, pc); | |
901 | entry->ent.type = TRACE_FN_RET; | |
902 | entry->ip = trace->func; | |
903 | entry->parent_ip = trace->ret; | |
904 | entry->rettime = trace->rettime; | |
905 | entry->calltime = trace->calltime; | |
0231022c | 906 | entry->overrun = trace->overrun; |
15e6cb36 FW |
907 | ring_buffer_unlock_commit(global_trace.buffer, event, irq_flags); |
908 | } | |
909 | #endif | |
910 | ||
e309b41d | 911 | void |
2e0f5761 | 912 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
38697053 SR |
913 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
914 | int pc) | |
2e0f5761 IM |
915 | { |
916 | if (likely(!atomic_read(&data->disabled))) | |
38697053 | 917 | trace_function(tr, data, ip, parent_ip, flags, pc); |
2e0f5761 IM |
918 | } |
919 | ||
38697053 SR |
920 | static void ftrace_trace_stack(struct trace_array *tr, |
921 | struct trace_array_cpu *data, | |
922 | unsigned long flags, | |
923 | int skip, int pc) | |
86387f7e | 924 | { |
c2c80529 | 925 | #ifdef CONFIG_STACKTRACE |
3928a8a2 | 926 | struct ring_buffer_event *event; |
777e208d | 927 | struct stack_entry *entry; |
86387f7e | 928 | struct stack_trace trace; |
3928a8a2 | 929 | unsigned long irq_flags; |
86387f7e IM |
930 | |
931 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) | |
932 | return; | |
933 | ||
3928a8a2 SR |
934 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
935 | &irq_flags); | |
936 | if (!event) | |
937 | return; | |
938 | entry = ring_buffer_event_data(event); | |
38697053 | 939 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d | 940 | entry->ent.type = TRACE_STACK; |
86387f7e | 941 | |
777e208d | 942 | memset(&entry->caller, 0, sizeof(entry->caller)); |
86387f7e IM |
943 | |
944 | trace.nr_entries = 0; | |
945 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
946 | trace.skip = skip; | |
777e208d | 947 | trace.entries = entry->caller; |
86387f7e IM |
948 | |
949 | save_stack_trace(&trace); | |
3928a8a2 | 950 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
c2c80529 | 951 | #endif |
f0a920d5 IM |
952 | } |
953 | ||
38697053 SR |
954 | void __trace_stack(struct trace_array *tr, |
955 | struct trace_array_cpu *data, | |
956 | unsigned long flags, | |
957 | int skip) | |
958 | { | |
959 | ftrace_trace_stack(tr, data, flags, skip, preempt_count()); | |
960 | } | |
961 | ||
02b67518 TE |
962 | static void ftrace_trace_userstack(struct trace_array *tr, |
963 | struct trace_array_cpu *data, | |
964 | unsigned long flags, int pc) | |
965 | { | |
8d7c6a96 | 966 | struct ring_buffer_event *event; |
02b67518 TE |
967 | struct userstack_entry *entry; |
968 | struct stack_trace trace; | |
02b67518 TE |
969 | unsigned long irq_flags; |
970 | ||
971 | if (!(trace_flags & TRACE_ITER_USERSTACKTRACE)) | |
972 | return; | |
973 | ||
974 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), | |
975 | &irq_flags); | |
976 | if (!event) | |
977 | return; | |
978 | entry = ring_buffer_event_data(event); | |
979 | tracing_generic_entry_update(&entry->ent, flags, pc); | |
980 | entry->ent.type = TRACE_USER_STACK; | |
981 | ||
982 | memset(&entry->caller, 0, sizeof(entry->caller)); | |
983 | ||
984 | trace.nr_entries = 0; | |
985 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
986 | trace.skip = 0; | |
987 | trace.entries = entry->caller; | |
988 | ||
989 | save_stack_trace_user(&trace); | |
990 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); | |
991 | } | |
992 | ||
993 | void __trace_userstack(struct trace_array *tr, | |
994 | struct trace_array_cpu *data, | |
995 | unsigned long flags) | |
996 | { | |
997 | ftrace_trace_userstack(tr, data, flags, preempt_count()); | |
998 | } | |
999 | ||
38697053 SR |
1000 | static void |
1001 | ftrace_trace_special(void *__tr, void *__data, | |
1002 | unsigned long arg1, unsigned long arg2, unsigned long arg3, | |
1003 | int pc) | |
a4feb834 | 1004 | { |
3928a8a2 | 1005 | struct ring_buffer_event *event; |
a4feb834 IM |
1006 | struct trace_array_cpu *data = __data; |
1007 | struct trace_array *tr = __tr; | |
777e208d | 1008 | struct special_entry *entry; |
a4feb834 IM |
1009 | unsigned long irq_flags; |
1010 | ||
3928a8a2 SR |
1011 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
1012 | &irq_flags); | |
1013 | if (!event) | |
1014 | return; | |
1015 | entry = ring_buffer_event_data(event); | |
38697053 | 1016 | tracing_generic_entry_update(&entry->ent, 0, pc); |
777e208d SR |
1017 | entry->ent.type = TRACE_SPECIAL; |
1018 | entry->arg1 = arg1; | |
1019 | entry->arg2 = arg2; | |
1020 | entry->arg3 = arg3; | |
3928a8a2 | 1021 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 1022 | ftrace_trace_stack(tr, data, irq_flags, 4, pc); |
02b67518 | 1023 | ftrace_trace_userstack(tr, data, irq_flags, pc); |
a4feb834 IM |
1024 | |
1025 | trace_wake_up(); | |
1026 | } | |
1027 | ||
38697053 SR |
1028 | void |
1029 | __trace_special(void *__tr, void *__data, | |
1030 | unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
1031 | { | |
1032 | ftrace_trace_special(__tr, __data, arg1, arg2, arg3, preempt_count()); | |
1033 | } | |
1034 | ||
e309b41d | 1035 | void |
bc0c38d1 SR |
1036 | tracing_sched_switch_trace(struct trace_array *tr, |
1037 | struct trace_array_cpu *data, | |
86387f7e IM |
1038 | struct task_struct *prev, |
1039 | struct task_struct *next, | |
38697053 | 1040 | unsigned long flags, int pc) |
bc0c38d1 | 1041 | { |
3928a8a2 | 1042 | struct ring_buffer_event *event; |
777e208d | 1043 | struct ctx_switch_entry *entry; |
dcb6308f | 1044 | unsigned long irq_flags; |
bc0c38d1 | 1045 | |
3928a8a2 SR |
1046 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
1047 | &irq_flags); | |
1048 | if (!event) | |
1049 | return; | |
1050 | entry = ring_buffer_event_data(event); | |
38697053 | 1051 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
1052 | entry->ent.type = TRACE_CTX; |
1053 | entry->prev_pid = prev->pid; | |
1054 | entry->prev_prio = prev->prio; | |
1055 | entry->prev_state = prev->state; | |
1056 | entry->next_pid = next->pid; | |
1057 | entry->next_prio = next->prio; | |
1058 | entry->next_state = next->state; | |
1059 | entry->next_cpu = task_cpu(next); | |
3928a8a2 | 1060 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 1061 | ftrace_trace_stack(tr, data, flags, 5, pc); |
02b67518 | 1062 | ftrace_trace_userstack(tr, data, flags, pc); |
bc0c38d1 SR |
1063 | } |
1064 | ||
57422797 IM |
1065 | void |
1066 | tracing_sched_wakeup_trace(struct trace_array *tr, | |
1067 | struct trace_array_cpu *data, | |
86387f7e IM |
1068 | struct task_struct *wakee, |
1069 | struct task_struct *curr, | |
38697053 | 1070 | unsigned long flags, int pc) |
57422797 | 1071 | { |
3928a8a2 | 1072 | struct ring_buffer_event *event; |
777e208d | 1073 | struct ctx_switch_entry *entry; |
57422797 IM |
1074 | unsigned long irq_flags; |
1075 | ||
3928a8a2 SR |
1076 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
1077 | &irq_flags); | |
1078 | if (!event) | |
1079 | return; | |
1080 | entry = ring_buffer_event_data(event); | |
38697053 | 1081 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
1082 | entry->ent.type = TRACE_WAKE; |
1083 | entry->prev_pid = curr->pid; | |
1084 | entry->prev_prio = curr->prio; | |
1085 | entry->prev_state = curr->state; | |
1086 | entry->next_pid = wakee->pid; | |
1087 | entry->next_prio = wakee->prio; | |
1088 | entry->next_state = wakee->state; | |
1089 | entry->next_cpu = task_cpu(wakee); | |
3928a8a2 | 1090 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 1091 | ftrace_trace_stack(tr, data, flags, 6, pc); |
02b67518 | 1092 | ftrace_trace_userstack(tr, data, flags, pc); |
017730c1 IM |
1093 | |
1094 | trace_wake_up(); | |
57422797 IM |
1095 | } |
1096 | ||
4902f884 SR |
1097 | void |
1098 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
1099 | { | |
1100 | struct trace_array *tr = &global_trace; | |
1101 | struct trace_array_cpu *data; | |
5aa1ba6a | 1102 | unsigned long flags; |
4902f884 | 1103 | int cpu; |
38697053 | 1104 | int pc; |
4902f884 | 1105 | |
c76f0694 | 1106 | if (tracing_disabled) |
4902f884 SR |
1107 | return; |
1108 | ||
38697053 | 1109 | pc = preempt_count(); |
5aa1ba6a | 1110 | local_irq_save(flags); |
4902f884 SR |
1111 | cpu = raw_smp_processor_id(); |
1112 | data = tr->data[cpu]; | |
4902f884 | 1113 | |
5aa1ba6a | 1114 | if (likely(atomic_inc_return(&data->disabled) == 1)) |
38697053 | 1115 | ftrace_trace_special(tr, data, arg1, arg2, arg3, pc); |
4902f884 | 1116 | |
5aa1ba6a SR |
1117 | atomic_dec(&data->disabled); |
1118 | local_irq_restore(flags); | |
4902f884 SR |
1119 | } |
1120 | ||
606576ce | 1121 | #ifdef CONFIG_FUNCTION_TRACER |
e309b41d | 1122 | static void |
b2a866f9 | 1123 | function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip) |
2e0f5761 IM |
1124 | { |
1125 | struct trace_array *tr = &global_trace; | |
1126 | struct trace_array_cpu *data; | |
1127 | unsigned long flags; | |
1128 | long disabled; | |
38697053 SR |
1129 | int cpu, resched; |
1130 | int pc; | |
2e0f5761 | 1131 | |
60bc0800 | 1132 | if (unlikely(!ftrace_function_enabled)) |
2e0f5761 IM |
1133 | return; |
1134 | ||
38697053 | 1135 | pc = preempt_count(); |
182e9f5f | 1136 | resched = ftrace_preempt_disable(); |
38697053 | 1137 | local_save_flags(flags); |
2e0f5761 IM |
1138 | cpu = raw_smp_processor_id(); |
1139 | data = tr->data[cpu]; | |
1140 | disabled = atomic_inc_return(&data->disabled); | |
1141 | ||
1142 | if (likely(disabled == 1)) | |
38697053 | 1143 | trace_function(tr, data, ip, parent_ip, flags, pc); |
2e0f5761 IM |
1144 | |
1145 | atomic_dec(&data->disabled); | |
182e9f5f | 1146 | ftrace_preempt_enable(resched); |
2e0f5761 IM |
1147 | } |
1148 | ||
b2a866f9 SR |
1149 | static void |
1150 | function_trace_call(unsigned long ip, unsigned long parent_ip) | |
1151 | { | |
1152 | struct trace_array *tr = &global_trace; | |
1153 | struct trace_array_cpu *data; | |
1154 | unsigned long flags; | |
1155 | long disabled; | |
1156 | int cpu; | |
1157 | int pc; | |
1158 | ||
1159 | if (unlikely(!ftrace_function_enabled)) | |
1160 | return; | |
1161 | ||
1162 | /* | |
1163 | * Need to use raw, since this must be called before the | |
1164 | * recursive protection is performed. | |
1165 | */ | |
d51ad7ac | 1166 | local_irq_save(flags); |
b2a866f9 SR |
1167 | cpu = raw_smp_processor_id(); |
1168 | data = tr->data[cpu]; | |
1169 | disabled = atomic_inc_return(&data->disabled); | |
1170 | ||
1171 | if (likely(disabled == 1)) { | |
1172 | pc = preempt_count(); | |
1173 | trace_function(tr, data, ip, parent_ip, flags, pc); | |
1174 | } | |
1175 | ||
1176 | atomic_dec(&data->disabled); | |
d51ad7ac | 1177 | local_irq_restore(flags); |
b2a866f9 SR |
1178 | } |
1179 | ||
fb52607a FW |
1180 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
1181 | void trace_function_graph(struct ftrace_graph_ret *trace) | |
15e6cb36 FW |
1182 | { |
1183 | struct trace_array *tr = &global_trace; | |
1184 | struct trace_array_cpu *data; | |
1185 | unsigned long flags; | |
1186 | long disabled; | |
1187 | int cpu; | |
1188 | int pc; | |
1189 | ||
1190 | raw_local_irq_save(flags); | |
1191 | cpu = raw_smp_processor_id(); | |
1192 | data = tr->data[cpu]; | |
1193 | disabled = atomic_inc_return(&data->disabled); | |
1194 | if (likely(disabled == 1)) { | |
1195 | pc = preempt_count(); | |
fb52607a | 1196 | __trace_function_graph(tr, data, trace, flags, pc); |
15e6cb36 FW |
1197 | } |
1198 | atomic_dec(&data->disabled); | |
1199 | raw_local_irq_restore(flags); | |
1200 | } | |
fb52607a | 1201 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 1202 | |
2e0f5761 IM |
1203 | static struct ftrace_ops trace_ops __read_mostly = |
1204 | { | |
1205 | .func = function_trace_call, | |
1206 | }; | |
1207 | ||
e309b41d | 1208 | void tracing_start_function_trace(void) |
2e0f5761 | 1209 | { |
60bc0800 | 1210 | ftrace_function_enabled = 0; |
b2a866f9 SR |
1211 | |
1212 | if (trace_flags & TRACE_ITER_PREEMPTONLY) | |
1213 | trace_ops.func = function_trace_call_preempt_only; | |
1214 | else | |
1215 | trace_ops.func = function_trace_call; | |
1216 | ||
2e0f5761 | 1217 | register_ftrace_function(&trace_ops); |
9036990d | 1218 | ftrace_function_enabled = 1; |
2e0f5761 IM |
1219 | } |
1220 | ||
e309b41d | 1221 | void tracing_stop_function_trace(void) |
2e0f5761 | 1222 | { |
60bc0800 | 1223 | ftrace_function_enabled = 0; |
2e0f5761 IM |
1224 | unregister_ftrace_function(&trace_ops); |
1225 | } | |
1226 | #endif | |
1227 | ||
bc0c38d1 SR |
1228 | enum trace_file_type { |
1229 | TRACE_FILE_LAT_FMT = 1, | |
12ef7d44 | 1230 | TRACE_FILE_ANNOTATE = 2, |
bc0c38d1 SR |
1231 | }; |
1232 | ||
5a90f577 SR |
1233 | static void trace_iterator_increment(struct trace_iterator *iter, int cpu) |
1234 | { | |
d769041f SR |
1235 | /* Don't allow ftrace to trace into the ring buffers */ |
1236 | ftrace_disable_cpu(); | |
1237 | ||
5a90f577 | 1238 | iter->idx++; |
d769041f SR |
1239 | if (iter->buffer_iter[iter->cpu]) |
1240 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); | |
1241 | ||
1242 | ftrace_enable_cpu(); | |
5a90f577 SR |
1243 | } |
1244 | ||
e309b41d | 1245 | static struct trace_entry * |
3928a8a2 | 1246 | peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts) |
dd0e545f | 1247 | { |
3928a8a2 SR |
1248 | struct ring_buffer_event *event; |
1249 | struct ring_buffer_iter *buf_iter = iter->buffer_iter[cpu]; | |
dd0e545f | 1250 | |
d769041f SR |
1251 | /* Don't allow ftrace to trace into the ring buffers */ |
1252 | ftrace_disable_cpu(); | |
1253 | ||
1254 | if (buf_iter) | |
1255 | event = ring_buffer_iter_peek(buf_iter, ts); | |
1256 | else | |
1257 | event = ring_buffer_peek(iter->tr->buffer, cpu, ts); | |
1258 | ||
1259 | ftrace_enable_cpu(); | |
1260 | ||
3928a8a2 | 1261 | return event ? ring_buffer_event_data(event) : NULL; |
dd0e545f | 1262 | } |
d769041f | 1263 | |
dd0e545f | 1264 | static struct trace_entry * |
3928a8a2 | 1265 | __find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
bc0c38d1 | 1266 | { |
3928a8a2 | 1267 | struct ring_buffer *buffer = iter->tr->buffer; |
bc0c38d1 | 1268 | struct trace_entry *ent, *next = NULL; |
3928a8a2 | 1269 | u64 next_ts = 0, ts; |
bc0c38d1 SR |
1270 | int next_cpu = -1; |
1271 | int cpu; | |
1272 | ||
ab46428c | 1273 | for_each_tracing_cpu(cpu) { |
dd0e545f | 1274 | |
3928a8a2 SR |
1275 | if (ring_buffer_empty_cpu(buffer, cpu)) |
1276 | continue; | |
dd0e545f | 1277 | |
3928a8a2 | 1278 | ent = peek_next_entry(iter, cpu, &ts); |
dd0e545f | 1279 | |
cdd31cd2 IM |
1280 | /* |
1281 | * Pick the entry with the smallest timestamp: | |
1282 | */ | |
3928a8a2 | 1283 | if (ent && (!next || ts < next_ts)) { |
bc0c38d1 SR |
1284 | next = ent; |
1285 | next_cpu = cpu; | |
3928a8a2 | 1286 | next_ts = ts; |
bc0c38d1 SR |
1287 | } |
1288 | } | |
1289 | ||
1290 | if (ent_cpu) | |
1291 | *ent_cpu = next_cpu; | |
1292 | ||
3928a8a2 SR |
1293 | if (ent_ts) |
1294 | *ent_ts = next_ts; | |
1295 | ||
bc0c38d1 SR |
1296 | return next; |
1297 | } | |
1298 | ||
dd0e545f SR |
1299 | /* Find the next real entry, without updating the iterator itself */ |
1300 | static struct trace_entry * | |
3928a8a2 | 1301 | find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
bc0c38d1 | 1302 | { |
3928a8a2 | 1303 | return __find_next_entry(iter, ent_cpu, ent_ts); |
dd0e545f SR |
1304 | } |
1305 | ||
1306 | /* Find the next real entry, and increment the iterator to the next entry */ | |
1307 | static void *find_next_entry_inc(struct trace_iterator *iter) | |
1308 | { | |
3928a8a2 | 1309 | iter->ent = __find_next_entry(iter, &iter->cpu, &iter->ts); |
dd0e545f | 1310 | |
3928a8a2 | 1311 | if (iter->ent) |
dd0e545f SR |
1312 | trace_iterator_increment(iter, iter->cpu); |
1313 | ||
3928a8a2 | 1314 | return iter->ent ? iter : NULL; |
b3806b43 | 1315 | } |
bc0c38d1 | 1316 | |
e309b41d | 1317 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 | 1318 | { |
d769041f SR |
1319 | /* Don't allow ftrace to trace into the ring buffers */ |
1320 | ftrace_disable_cpu(); | |
3928a8a2 | 1321 | ring_buffer_consume(iter->tr->buffer, iter->cpu, &iter->ts); |
d769041f | 1322 | ftrace_enable_cpu(); |
bc0c38d1 SR |
1323 | } |
1324 | ||
e309b41d | 1325 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
1326 | { |
1327 | struct trace_iterator *iter = m->private; | |
bc0c38d1 | 1328 | int i = (int)*pos; |
4e3c3333 | 1329 | void *ent; |
bc0c38d1 SR |
1330 | |
1331 | (*pos)++; | |
1332 | ||
1333 | /* can't go backwards */ | |
1334 | if (iter->idx > i) | |
1335 | return NULL; | |
1336 | ||
1337 | if (iter->idx < 0) | |
1338 | ent = find_next_entry_inc(iter); | |
1339 | else | |
1340 | ent = iter; | |
1341 | ||
1342 | while (ent && iter->idx < i) | |
1343 | ent = find_next_entry_inc(iter); | |
1344 | ||
1345 | iter->pos = *pos; | |
1346 | ||
bc0c38d1 SR |
1347 | return ent; |
1348 | } | |
1349 | ||
1350 | static void *s_start(struct seq_file *m, loff_t *pos) | |
1351 | { | |
1352 | struct trace_iterator *iter = m->private; | |
1353 | void *p = NULL; | |
1354 | loff_t l = 0; | |
3928a8a2 | 1355 | int cpu; |
bc0c38d1 SR |
1356 | |
1357 | mutex_lock(&trace_types_lock); | |
1358 | ||
d15f57f2 SR |
1359 | if (!current_trace || current_trace != iter->trace) { |
1360 | mutex_unlock(&trace_types_lock); | |
bc0c38d1 | 1361 | return NULL; |
d15f57f2 | 1362 | } |
bc0c38d1 SR |
1363 | |
1364 | atomic_inc(&trace_record_cmdline_disabled); | |
1365 | ||
bc0c38d1 SR |
1366 | if (*pos != iter->pos) { |
1367 | iter->ent = NULL; | |
1368 | iter->cpu = 0; | |
1369 | iter->idx = -1; | |
1370 | ||
d769041f SR |
1371 | ftrace_disable_cpu(); |
1372 | ||
3928a8a2 SR |
1373 | for_each_tracing_cpu(cpu) { |
1374 | ring_buffer_iter_reset(iter->buffer_iter[cpu]); | |
4c11d7ae | 1375 | } |
bc0c38d1 | 1376 | |
d769041f SR |
1377 | ftrace_enable_cpu(); |
1378 | ||
bc0c38d1 SR |
1379 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
1380 | ; | |
1381 | ||
1382 | } else { | |
4c11d7ae | 1383 | l = *pos - 1; |
bc0c38d1 SR |
1384 | p = s_next(m, p, &l); |
1385 | } | |
1386 | ||
1387 | return p; | |
1388 | } | |
1389 | ||
1390 | static void s_stop(struct seq_file *m, void *p) | |
1391 | { | |
bc0c38d1 | 1392 | atomic_dec(&trace_record_cmdline_disabled); |
bc0c38d1 SR |
1393 | mutex_unlock(&trace_types_lock); |
1394 | } | |
1395 | ||
76094a2c | 1396 | #ifdef CONFIG_KRETPROBES |
b3aa5577 | 1397 | static inline const char *kretprobed(const char *name) |
76094a2c | 1398 | { |
b3aa5577 SR |
1399 | static const char tramp_name[] = "kretprobe_trampoline"; |
1400 | int size = sizeof(tramp_name); | |
1401 | ||
1402 | if (strncmp(tramp_name, name, size) == 0) | |
1403 | return "[unknown/kretprobe'd]"; | |
1404 | return name; | |
76094a2c AS |
1405 | } |
1406 | #else | |
b3aa5577 | 1407 | static inline const char *kretprobed(const char *name) |
76094a2c | 1408 | { |
b3aa5577 | 1409 | return name; |
76094a2c AS |
1410 | } |
1411 | #endif /* CONFIG_KRETPROBES */ | |
1412 | ||
b3806b43 | 1413 | static int |
214023c3 | 1414 | seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) |
bc0c38d1 SR |
1415 | { |
1416 | #ifdef CONFIG_KALLSYMS | |
1417 | char str[KSYM_SYMBOL_LEN]; | |
b3aa5577 | 1418 | const char *name; |
bc0c38d1 SR |
1419 | |
1420 | kallsyms_lookup(address, NULL, NULL, NULL, str); | |
1421 | ||
b3aa5577 SR |
1422 | name = kretprobed(str); |
1423 | ||
1424 | return trace_seq_printf(s, fmt, name); | |
bc0c38d1 | 1425 | #endif |
b3806b43 | 1426 | return 1; |
bc0c38d1 SR |
1427 | } |
1428 | ||
b3806b43 | 1429 | static int |
214023c3 SR |
1430 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
1431 | unsigned long address) | |
bc0c38d1 SR |
1432 | { |
1433 | #ifdef CONFIG_KALLSYMS | |
1434 | char str[KSYM_SYMBOL_LEN]; | |
b3aa5577 | 1435 | const char *name; |
bc0c38d1 SR |
1436 | |
1437 | sprint_symbol(str, address); | |
b3aa5577 SR |
1438 | name = kretprobed(str); |
1439 | ||
1440 | return trace_seq_printf(s, fmt, name); | |
bc0c38d1 | 1441 | #endif |
b3806b43 | 1442 | return 1; |
bc0c38d1 SR |
1443 | } |
1444 | ||
1445 | #ifndef CONFIG_64BIT | |
1446 | # define IP_FMT "%08lx" | |
1447 | #else | |
1448 | # define IP_FMT "%016lx" | |
1449 | #endif | |
1450 | ||
15e6cb36 | 1451 | int |
214023c3 | 1452 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) |
bc0c38d1 | 1453 | { |
b3806b43 SR |
1454 | int ret; |
1455 | ||
1456 | if (!ip) | |
1457 | return trace_seq_printf(s, "0"); | |
bc0c38d1 SR |
1458 | |
1459 | if (sym_flags & TRACE_ITER_SYM_OFFSET) | |
b3806b43 | 1460 | ret = seq_print_sym_offset(s, "%s", ip); |
bc0c38d1 | 1461 | else |
b3806b43 SR |
1462 | ret = seq_print_sym_short(s, "%s", ip); |
1463 | ||
1464 | if (!ret) | |
1465 | return 0; | |
bc0c38d1 SR |
1466 | |
1467 | if (sym_flags & TRACE_ITER_SYM_ADDR) | |
b3806b43 SR |
1468 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
1469 | return ret; | |
bc0c38d1 SR |
1470 | } |
1471 | ||
b54d3de9 TE |
1472 | static inline int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, |
1473 | unsigned long ip, unsigned long sym_flags) | |
1474 | { | |
1475 | struct file *file = NULL; | |
1476 | unsigned long vmstart = 0; | |
1477 | int ret = 1; | |
1478 | ||
1479 | if (mm) { | |
cffa10ae TE |
1480 | const struct vm_area_struct *vma; |
1481 | ||
1482 | down_read(&mm->mmap_sem); | |
1483 | vma = find_vma(mm, ip); | |
b54d3de9 TE |
1484 | if (vma) { |
1485 | file = vma->vm_file; | |
1486 | vmstart = vma->vm_start; | |
1487 | } | |
e38da592 TE |
1488 | if (file) { |
1489 | ret = trace_seq_path(s, &file->f_path); | |
1490 | if (ret) | |
1491 | ret = trace_seq_printf(s, "[+0x%lx]", ip - vmstart); | |
1492 | } | |
cffa10ae | 1493 | up_read(&mm->mmap_sem); |
b54d3de9 | 1494 | } |
b54d3de9 TE |
1495 | if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file)) |
1496 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); | |
1497 | return ret; | |
1498 | } | |
1499 | ||
02b67518 TE |
1500 | static int |
1501 | seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s, | |
b54d3de9 | 1502 | unsigned long sym_flags) |
02b67518 | 1503 | { |
b54d3de9 | 1504 | struct mm_struct *mm = NULL; |
02b67518 | 1505 | int ret = 1; |
8d7c6a96 | 1506 | unsigned int i; |
02b67518 | 1507 | |
b54d3de9 TE |
1508 | if (trace_flags & TRACE_ITER_SYM_USEROBJ) { |
1509 | struct task_struct *task; | |
1510 | /* | |
1511 | * we do the lookup on the thread group leader, | |
1512 | * since individual threads might have already quit! | |
1513 | */ | |
1514 | rcu_read_lock(); | |
1515 | task = find_task_by_vpid(entry->ent.tgid); | |
b54d3de9 TE |
1516 | if (task) |
1517 | mm = get_task_mm(task); | |
cffa10ae | 1518 | rcu_read_unlock(); |
b54d3de9 TE |
1519 | } |
1520 | ||
02b67518 TE |
1521 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
1522 | unsigned long ip = entry->caller[i]; | |
1523 | ||
1524 | if (ip == ULONG_MAX || !ret) | |
1525 | break; | |
b54d3de9 | 1526 | if (i && ret) |
02b67518 TE |
1527 | ret = trace_seq_puts(s, " <- "); |
1528 | if (!ip) { | |
b54d3de9 TE |
1529 | if (ret) |
1530 | ret = trace_seq_puts(s, "??"); | |
02b67518 TE |
1531 | continue; |
1532 | } | |
b54d3de9 TE |
1533 | if (!ret) |
1534 | break; | |
1535 | if (ret) | |
1536 | ret = seq_print_user_ip(s, mm, ip, sym_flags); | |
02b67518 TE |
1537 | } |
1538 | ||
b54d3de9 TE |
1539 | if (mm) |
1540 | mmput(mm); | |
02b67518 TE |
1541 | return ret; |
1542 | } | |
1543 | ||
e309b41d | 1544 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 | 1545 | { |
a6168353 ME |
1546 | seq_puts(m, "# _------=> CPU# \n"); |
1547 | seq_puts(m, "# / _-----=> irqs-off \n"); | |
1548 | seq_puts(m, "# | / _----=> need-resched \n"); | |
1549 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); | |
1550 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); | |
1551 | seq_puts(m, "# |||| / \n"); | |
1552 | seq_puts(m, "# ||||| delay \n"); | |
1553 | seq_puts(m, "# cmd pid ||||| time | caller \n"); | |
1554 | seq_puts(m, "# \\ / ||||| \\ | / \n"); | |
bc0c38d1 SR |
1555 | } |
1556 | ||
e309b41d | 1557 | static void print_func_help_header(struct seq_file *m) |
bc0c38d1 | 1558 | { |
a6168353 ME |
1559 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
1560 | seq_puts(m, "# | | | | |\n"); | |
bc0c38d1 SR |
1561 | } |
1562 | ||
1563 | ||
e309b41d | 1564 | static void |
bc0c38d1 SR |
1565 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
1566 | { | |
1567 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); | |
1568 | struct trace_array *tr = iter->tr; | |
1569 | struct trace_array_cpu *data = tr->data[tr->cpu]; | |
1570 | struct tracer *type = current_trace; | |
3928a8a2 SR |
1571 | unsigned long total; |
1572 | unsigned long entries; | |
bc0c38d1 SR |
1573 | const char *name = "preemption"; |
1574 | ||
1575 | if (type) | |
1576 | name = type->name; | |
1577 | ||
3928a8a2 SR |
1578 | entries = ring_buffer_entries(iter->tr->buffer); |
1579 | total = entries + | |
1580 | ring_buffer_overruns(iter->tr->buffer); | |
bc0c38d1 SR |
1581 | |
1582 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", | |
1583 | name, UTS_RELEASE); | |
1584 | seq_puts(m, "-----------------------------------" | |
1585 | "---------------------------------\n"); | |
1586 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" | |
1587 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", | |
57f50be1 | 1588 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 1589 | entries, |
4c11d7ae | 1590 | total, |
bc0c38d1 SR |
1591 | tr->cpu, |
1592 | #if defined(CONFIG_PREEMPT_NONE) | |
1593 | "server", | |
1594 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
1595 | "desktop", | |
b5c21b45 | 1596 | #elif defined(CONFIG_PREEMPT) |
bc0c38d1 SR |
1597 | "preempt", |
1598 | #else | |
1599 | "unknown", | |
1600 | #endif | |
1601 | /* These are reserved for later use */ | |
1602 | 0, 0, 0, 0); | |
1603 | #ifdef CONFIG_SMP | |
1604 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
1605 | #else | |
1606 | seq_puts(m, ")\n"); | |
1607 | #endif | |
1608 | seq_puts(m, " -----------------\n"); | |
1609 | seq_printf(m, " | task: %.16s-%d " | |
1610 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", | |
1611 | data->comm, data->pid, data->uid, data->nice, | |
1612 | data->policy, data->rt_priority); | |
1613 | seq_puts(m, " -----------------\n"); | |
1614 | ||
1615 | if (data->critical_start) { | |
1616 | seq_puts(m, " => started at: "); | |
214023c3 SR |
1617 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
1618 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 | 1619 | seq_puts(m, "\n => ended at: "); |
214023c3 SR |
1620 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
1621 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 SR |
1622 | seq_puts(m, "\n"); |
1623 | } | |
1624 | ||
1625 | seq_puts(m, "\n"); | |
1626 | } | |
1627 | ||
e309b41d | 1628 | static void |
214023c3 | 1629 | lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) |
bc0c38d1 SR |
1630 | { |
1631 | int hardirq, softirq; | |
1632 | char *comm; | |
1633 | ||
777e208d | 1634 | comm = trace_find_cmdline(entry->pid); |
bc0c38d1 | 1635 | |
777e208d | 1636 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
a6168353 | 1637 | trace_seq_printf(s, "%3d", cpu); |
214023c3 | 1638 | trace_seq_printf(s, "%c%c", |
9244489a SR |
1639 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : |
1640 | (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : '.', | |
777e208d | 1641 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); |
bc0c38d1 | 1642 | |
777e208d SR |
1643 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; |
1644 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; | |
afc2abc0 | 1645 | if (hardirq && softirq) { |
214023c3 | 1646 | trace_seq_putc(s, 'H'); |
afc2abc0 IM |
1647 | } else { |
1648 | if (hardirq) { | |
214023c3 | 1649 | trace_seq_putc(s, 'h'); |
afc2abc0 | 1650 | } else { |
bc0c38d1 | 1651 | if (softirq) |
214023c3 | 1652 | trace_seq_putc(s, 's'); |
bc0c38d1 | 1653 | else |
214023c3 | 1654 | trace_seq_putc(s, '.'); |
bc0c38d1 SR |
1655 | } |
1656 | } | |
1657 | ||
777e208d SR |
1658 | if (entry->preempt_count) |
1659 | trace_seq_printf(s, "%x", entry->preempt_count); | |
bc0c38d1 | 1660 | else |
214023c3 | 1661 | trace_seq_puts(s, "."); |
bc0c38d1 SR |
1662 | } |
1663 | ||
1664 | unsigned long preempt_mark_thresh = 100; | |
1665 | ||
e309b41d | 1666 | static void |
3928a8a2 | 1667 | lat_print_timestamp(struct trace_seq *s, u64 abs_usecs, |
bc0c38d1 SR |
1668 | unsigned long rel_usecs) |
1669 | { | |
214023c3 | 1670 | trace_seq_printf(s, " %4lldus", abs_usecs); |
bc0c38d1 | 1671 | if (rel_usecs > preempt_mark_thresh) |
214023c3 | 1672 | trace_seq_puts(s, "!: "); |
bc0c38d1 | 1673 | else if (rel_usecs > 1) |
214023c3 | 1674 | trace_seq_puts(s, "+: "); |
bc0c38d1 | 1675 | else |
214023c3 | 1676 | trace_seq_puts(s, " : "); |
bc0c38d1 SR |
1677 | } |
1678 | ||
1679 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; | |
1680 | ||
fc5e27ae PP |
1681 | /* |
1682 | * The message is supposed to contain an ending newline. | |
1683 | * If the printing stops prematurely, try to add a newline of our own. | |
1684 | */ | |
1685 | void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter) | |
dd0e545f | 1686 | { |
dd0e545f | 1687 | struct trace_entry *ent; |
777e208d | 1688 | struct trace_field_cont *cont; |
fc5e27ae | 1689 | bool ok = true; |
dd0e545f | 1690 | |
3928a8a2 | 1691 | ent = peek_next_entry(iter, iter->cpu, NULL); |
dd0e545f SR |
1692 | if (!ent || ent->type != TRACE_CONT) { |
1693 | trace_seq_putc(s, '\n'); | |
1694 | return; | |
1695 | } | |
1696 | ||
1697 | do { | |
777e208d | 1698 | cont = (struct trace_field_cont *)ent; |
fc5e27ae | 1699 | if (ok) |
777e208d | 1700 | ok = (trace_seq_printf(s, "%s", cont->buf) > 0); |
d769041f SR |
1701 | |
1702 | ftrace_disable_cpu(); | |
1703 | ||
1704 | if (iter->buffer_iter[iter->cpu]) | |
1705 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); | |
1706 | else | |
1707 | ring_buffer_consume(iter->tr->buffer, iter->cpu, NULL); | |
1708 | ||
1709 | ftrace_enable_cpu(); | |
1710 | ||
3928a8a2 | 1711 | ent = peek_next_entry(iter, iter->cpu, NULL); |
dd0e545f | 1712 | } while (ent && ent->type == TRACE_CONT); |
fc5e27ae PP |
1713 | |
1714 | if (!ok) | |
1715 | trace_seq_putc(s, '\n'); | |
dd0e545f SR |
1716 | } |
1717 | ||
a309720c SR |
1718 | static void test_cpu_buff_start(struct trace_iterator *iter) |
1719 | { | |
1720 | struct trace_seq *s = &iter->seq; | |
1721 | ||
12ef7d44 SR |
1722 | if (!(trace_flags & TRACE_ITER_ANNOTATE)) |
1723 | return; | |
1724 | ||
1725 | if (!(iter->iter_flags & TRACE_FILE_ANNOTATE)) | |
1726 | return; | |
1727 | ||
a309720c SR |
1728 | if (cpu_isset(iter->cpu, iter->started)) |
1729 | return; | |
1730 | ||
1731 | cpu_set(iter->cpu, iter->started); | |
1732 | trace_seq_printf(s, "##### CPU %u buffer started ####\n", iter->cpu); | |
1733 | } | |
1734 | ||
2c4f035f | 1735 | static enum print_line_t |
214023c3 | 1736 | print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) |
bc0c38d1 | 1737 | { |
214023c3 | 1738 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1739 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
3928a8a2 | 1740 | struct trace_entry *next_entry; |
bc0c38d1 SR |
1741 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); |
1742 | struct trace_entry *entry = iter->ent; | |
1743 | unsigned long abs_usecs; | |
1744 | unsigned long rel_usecs; | |
3928a8a2 | 1745 | u64 next_ts; |
bc0c38d1 | 1746 | char *comm; |
bac524d3 | 1747 | int S, T; |
86387f7e | 1748 | int i; |
d17d9691 | 1749 | unsigned state; |
bc0c38d1 | 1750 | |
dd0e545f | 1751 | if (entry->type == TRACE_CONT) |
2c4f035f | 1752 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1753 | |
a309720c SR |
1754 | test_cpu_buff_start(iter); |
1755 | ||
3928a8a2 SR |
1756 | next_entry = find_next_entry(iter, NULL, &next_ts); |
1757 | if (!next_entry) | |
1758 | next_ts = iter->ts; | |
1759 | rel_usecs = ns2usecs(next_ts - iter->ts); | |
1760 | abs_usecs = ns2usecs(iter->ts - iter->tr->time_start); | |
bc0c38d1 SR |
1761 | |
1762 | if (verbose) { | |
777e208d | 1763 | comm = trace_find_cmdline(entry->pid); |
a6168353 | 1764 | trace_seq_printf(s, "%16s %5d %3d %d %08x %08x [%08lx]" |
214023c3 SR |
1765 | " %ld.%03ldms (+%ld.%03ldms): ", |
1766 | comm, | |
777e208d SR |
1767 | entry->pid, cpu, entry->flags, |
1768 | entry->preempt_count, trace_idx, | |
3928a8a2 | 1769 | ns2usecs(iter->ts), |
214023c3 SR |
1770 | abs_usecs/1000, |
1771 | abs_usecs % 1000, rel_usecs/1000, | |
1772 | rel_usecs % 1000); | |
bc0c38d1 | 1773 | } else { |
f29c73fe IM |
1774 | lat_print_generic(s, entry, cpu); |
1775 | lat_print_timestamp(s, abs_usecs, rel_usecs); | |
bc0c38d1 SR |
1776 | } |
1777 | switch (entry->type) { | |
777e208d | 1778 | case TRACE_FN: { |
7104f300 SR |
1779 | struct ftrace_entry *field; |
1780 | ||
1781 | trace_assign_type(field, entry); | |
777e208d SR |
1782 | |
1783 | seq_print_ip_sym(s, field->ip, sym_flags); | |
214023c3 | 1784 | trace_seq_puts(s, " ("); |
b3aa5577 | 1785 | seq_print_ip_sym(s, field->parent_ip, sym_flags); |
214023c3 | 1786 | trace_seq_puts(s, ")\n"); |
bc0c38d1 | 1787 | break; |
777e208d | 1788 | } |
bc0c38d1 | 1789 | case TRACE_CTX: |
777e208d | 1790 | case TRACE_WAKE: { |
7104f300 SR |
1791 | struct ctx_switch_entry *field; |
1792 | ||
1793 | trace_assign_type(field, entry); | |
777e208d SR |
1794 | |
1795 | T = field->next_state < sizeof(state_to_char) ? | |
1796 | state_to_char[field->next_state] : 'X'; | |
bac524d3 | 1797 | |
777e208d SR |
1798 | state = field->prev_state ? |
1799 | __ffs(field->prev_state) + 1 : 0; | |
d17d9691 | 1800 | S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X'; |
777e208d | 1801 | comm = trace_find_cmdline(field->next_pid); |
80b5e940 | 1802 | trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n", |
777e208d SR |
1803 | field->prev_pid, |
1804 | field->prev_prio, | |
57422797 | 1805 | S, entry->type == TRACE_CTX ? "==>" : " +", |
777e208d SR |
1806 | field->next_cpu, |
1807 | field->next_pid, | |
1808 | field->next_prio, | |
bac524d3 | 1809 | T, comm); |
bc0c38d1 | 1810 | break; |
777e208d SR |
1811 | } |
1812 | case TRACE_SPECIAL: { | |
7104f300 SR |
1813 | struct special_entry *field; |
1814 | ||
1815 | trace_assign_type(field, entry); | |
777e208d | 1816 | |
88a4216c | 1817 | trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
1818 | field->arg1, |
1819 | field->arg2, | |
1820 | field->arg3); | |
f0a920d5 | 1821 | break; |
777e208d SR |
1822 | } |
1823 | case TRACE_STACK: { | |
7104f300 SR |
1824 | struct stack_entry *field; |
1825 | ||
1826 | trace_assign_type(field, entry); | |
777e208d | 1827 | |
86387f7e IM |
1828 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
1829 | if (i) | |
1830 | trace_seq_puts(s, " <= "); | |
777e208d | 1831 | seq_print_ip_sym(s, field->caller[i], sym_flags); |
86387f7e IM |
1832 | } |
1833 | trace_seq_puts(s, "\n"); | |
1834 | break; | |
777e208d SR |
1835 | } |
1836 | case TRACE_PRINT: { | |
7104f300 SR |
1837 | struct print_entry *field; |
1838 | ||
1839 | trace_assign_type(field, entry); | |
777e208d SR |
1840 | |
1841 | seq_print_ip_sym(s, field->ip, sym_flags); | |
1842 | trace_seq_printf(s, ": %s", field->buf); | |
1843 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
1844 | trace_seq_print_cont(s, iter); |
1845 | break; | |
777e208d | 1846 | } |
9f029e83 SR |
1847 | case TRACE_BRANCH: { |
1848 | struct trace_branch *field; | |
52f232cb SR |
1849 | |
1850 | trace_assign_type(field, entry); | |
1851 | ||
1852 | trace_seq_printf(s, "[%s] %s:%s:%d\n", | |
68d119f0 | 1853 | field->correct ? " ok " : " MISS ", |
52f232cb SR |
1854 | field->func, |
1855 | field->file, | |
1856 | field->line); | |
1857 | break; | |
1858 | } | |
02b67518 TE |
1859 | case TRACE_USER_STACK: { |
1860 | struct userstack_entry *field; | |
1861 | ||
1862 | trace_assign_type(field, entry); | |
1863 | ||
1864 | seq_print_userip_objs(field, s, sym_flags); | |
b54d3de9 | 1865 | trace_seq_putc(s, '\n'); |
02b67518 TE |
1866 | break; |
1867 | } | |
89b2f978 | 1868 | default: |
214023c3 | 1869 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
bc0c38d1 | 1870 | } |
2c4f035f | 1871 | return TRACE_TYPE_HANDLED; |
bc0c38d1 SR |
1872 | } |
1873 | ||
2c4f035f | 1874 | static enum print_line_t print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 1875 | { |
214023c3 | 1876 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1877 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 1878 | struct trace_entry *entry; |
bc0c38d1 SR |
1879 | unsigned long usec_rem; |
1880 | unsigned long long t; | |
1881 | unsigned long secs; | |
1882 | char *comm; | |
b3806b43 | 1883 | int ret; |
bac524d3 | 1884 | int S, T; |
86387f7e | 1885 | int i; |
bc0c38d1 | 1886 | |
4e3c3333 | 1887 | entry = iter->ent; |
dd0e545f SR |
1888 | |
1889 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1890 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1891 | |
a309720c SR |
1892 | test_cpu_buff_start(iter); |
1893 | ||
777e208d | 1894 | comm = trace_find_cmdline(iter->ent->pid); |
bc0c38d1 | 1895 | |
3928a8a2 | 1896 | t = ns2usecs(iter->ts); |
bc0c38d1 SR |
1897 | usec_rem = do_div(t, 1000000ULL); |
1898 | secs = (unsigned long)t; | |
1899 | ||
777e208d | 1900 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
f29c73fe | 1901 | if (!ret) |
2c4f035f | 1902 | return TRACE_TYPE_PARTIAL_LINE; |
a6168353 | 1903 | ret = trace_seq_printf(s, "[%03d] ", iter->cpu); |
f29c73fe | 1904 | if (!ret) |
2c4f035f | 1905 | return TRACE_TYPE_PARTIAL_LINE; |
f29c73fe IM |
1906 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); |
1907 | if (!ret) | |
2c4f035f | 1908 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 SR |
1909 | |
1910 | switch (entry->type) { | |
777e208d | 1911 | case TRACE_FN: { |
7104f300 SR |
1912 | struct ftrace_entry *field; |
1913 | ||
1914 | trace_assign_type(field, entry); | |
777e208d SR |
1915 | |
1916 | ret = seq_print_ip_sym(s, field->ip, sym_flags); | |
b3806b43 | 1917 | if (!ret) |
2c4f035f | 1918 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1919 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
777e208d | 1920 | field->parent_ip) { |
b3806b43 SR |
1921 | ret = trace_seq_printf(s, " <-"); |
1922 | if (!ret) | |
2c4f035f | 1923 | return TRACE_TYPE_PARTIAL_LINE; |
b3aa5577 SR |
1924 | ret = seq_print_ip_sym(s, |
1925 | field->parent_ip, | |
1926 | sym_flags); | |
b3806b43 | 1927 | if (!ret) |
2c4f035f | 1928 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1929 | } |
b3806b43 SR |
1930 | ret = trace_seq_printf(s, "\n"); |
1931 | if (!ret) | |
2c4f035f | 1932 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1933 | break; |
777e208d | 1934 | } |
bc0c38d1 | 1935 | case TRACE_CTX: |
777e208d | 1936 | case TRACE_WAKE: { |
7104f300 SR |
1937 | struct ctx_switch_entry *field; |
1938 | ||
1939 | trace_assign_type(field, entry); | |
777e208d SR |
1940 | |
1941 | S = field->prev_state < sizeof(state_to_char) ? | |
1942 | state_to_char[field->prev_state] : 'X'; | |
1943 | T = field->next_state < sizeof(state_to_char) ? | |
1944 | state_to_char[field->next_state] : 'X'; | |
80b5e940 | 1945 | ret = trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c\n", |
777e208d SR |
1946 | field->prev_pid, |
1947 | field->prev_prio, | |
b3806b43 | 1948 | S, |
57422797 | 1949 | entry->type == TRACE_CTX ? "==>" : " +", |
777e208d SR |
1950 | field->next_cpu, |
1951 | field->next_pid, | |
1952 | field->next_prio, | |
bac524d3 | 1953 | T); |
b3806b43 | 1954 | if (!ret) |
2c4f035f | 1955 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1956 | break; |
777e208d SR |
1957 | } |
1958 | case TRACE_SPECIAL: { | |
7104f300 SR |
1959 | struct special_entry *field; |
1960 | ||
1961 | trace_assign_type(field, entry); | |
777e208d | 1962 | |
88a4216c | 1963 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
1964 | field->arg1, |
1965 | field->arg2, | |
1966 | field->arg3); | |
f0a920d5 | 1967 | if (!ret) |
2c4f035f | 1968 | return TRACE_TYPE_PARTIAL_LINE; |
f0a920d5 | 1969 | break; |
777e208d SR |
1970 | } |
1971 | case TRACE_STACK: { | |
7104f300 SR |
1972 | struct stack_entry *field; |
1973 | ||
1974 | trace_assign_type(field, entry); | |
777e208d | 1975 | |
86387f7e IM |
1976 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
1977 | if (i) { | |
1978 | ret = trace_seq_puts(s, " <= "); | |
1979 | if (!ret) | |
2c4f035f | 1980 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e | 1981 | } |
777e208d | 1982 | ret = seq_print_ip_sym(s, field->caller[i], |
86387f7e IM |
1983 | sym_flags); |
1984 | if (!ret) | |
2c4f035f | 1985 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e IM |
1986 | } |
1987 | ret = trace_seq_puts(s, "\n"); | |
1988 | if (!ret) | |
2c4f035f | 1989 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e | 1990 | break; |
777e208d SR |
1991 | } |
1992 | case TRACE_PRINT: { | |
7104f300 SR |
1993 | struct print_entry *field; |
1994 | ||
1995 | trace_assign_type(field, entry); | |
777e208d SR |
1996 | |
1997 | seq_print_ip_sym(s, field->ip, sym_flags); | |
1998 | trace_seq_printf(s, ": %s", field->buf); | |
1999 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
2000 | trace_seq_print_cont(s, iter); |
2001 | break; | |
bc0c38d1 | 2002 | } |
15e6cb36 | 2003 | case TRACE_FN_RET: { |
fb52607a | 2004 | return print_graph_function(iter); |
15e6cb36 FW |
2005 | break; |
2006 | } | |
9f029e83 SR |
2007 | case TRACE_BRANCH: { |
2008 | struct trace_branch *field; | |
52f232cb SR |
2009 | |
2010 | trace_assign_type(field, entry); | |
2011 | ||
2012 | trace_seq_printf(s, "[%s] %s:%s:%d\n", | |
68d119f0 | 2013 | field->correct ? " ok " : " MISS ", |
52f232cb SR |
2014 | field->func, |
2015 | field->file, | |
2016 | field->line); | |
2017 | break; | |
2018 | } | |
02b67518 TE |
2019 | case TRACE_USER_STACK: { |
2020 | struct userstack_entry *field; | |
2021 | ||
2022 | trace_assign_type(field, entry); | |
2023 | ||
2024 | ret = seq_print_userip_objs(field, s, sym_flags); | |
2025 | if (!ret) | |
2026 | return TRACE_TYPE_PARTIAL_LINE; | |
2027 | ret = trace_seq_putc(s, '\n'); | |
2028 | if (!ret) | |
2029 | return TRACE_TYPE_PARTIAL_LINE; | |
2030 | break; | |
2031 | } | |
777e208d | 2032 | } |
2c4f035f | 2033 | return TRACE_TYPE_HANDLED; |
bc0c38d1 SR |
2034 | } |
2035 | ||
2c4f035f | 2036 | static enum print_line_t print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 IM |
2037 | { |
2038 | struct trace_seq *s = &iter->seq; | |
2039 | struct trace_entry *entry; | |
2040 | int ret; | |
bac524d3 | 2041 | int S, T; |
f9896bf3 IM |
2042 | |
2043 | entry = iter->ent; | |
dd0e545f SR |
2044 | |
2045 | if (entry->type == TRACE_CONT) | |
2c4f035f | 2046 | return TRACE_TYPE_HANDLED; |
dd0e545f | 2047 | |
f9896bf3 | 2048 | ret = trace_seq_printf(s, "%d %d %llu ", |
777e208d | 2049 | entry->pid, iter->cpu, iter->ts); |
f9896bf3 | 2050 | if (!ret) |
2c4f035f | 2051 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 IM |
2052 | |
2053 | switch (entry->type) { | |
777e208d | 2054 | case TRACE_FN: { |
7104f300 SR |
2055 | struct ftrace_entry *field; |
2056 | ||
2057 | trace_assign_type(field, entry); | |
777e208d | 2058 | |
f9896bf3 | 2059 | ret = trace_seq_printf(s, "%x %x\n", |
777e208d SR |
2060 | field->ip, |
2061 | field->parent_ip); | |
f9896bf3 | 2062 | if (!ret) |
2c4f035f | 2063 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 | 2064 | break; |
777e208d | 2065 | } |
f9896bf3 | 2066 | case TRACE_CTX: |
777e208d | 2067 | case TRACE_WAKE: { |
7104f300 SR |
2068 | struct ctx_switch_entry *field; |
2069 | ||
2070 | trace_assign_type(field, entry); | |
777e208d SR |
2071 | |
2072 | S = field->prev_state < sizeof(state_to_char) ? | |
2073 | state_to_char[field->prev_state] : 'X'; | |
2074 | T = field->next_state < sizeof(state_to_char) ? | |
2075 | state_to_char[field->next_state] : 'X'; | |
57422797 IM |
2076 | if (entry->type == TRACE_WAKE) |
2077 | S = '+'; | |
80b5e940 | 2078 | ret = trace_seq_printf(s, "%d %d %c %d %d %d %c\n", |
777e208d SR |
2079 | field->prev_pid, |
2080 | field->prev_prio, | |
f9896bf3 | 2081 | S, |
777e208d SR |
2082 | field->next_cpu, |
2083 | field->next_pid, | |
2084 | field->next_prio, | |
bac524d3 | 2085 | T); |
f9896bf3 | 2086 | if (!ret) |
2c4f035f | 2087 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 | 2088 | break; |
777e208d | 2089 | } |
f0a920d5 | 2090 | case TRACE_SPECIAL: |
02b67518 | 2091 | case TRACE_USER_STACK: |
777e208d | 2092 | case TRACE_STACK: { |
7104f300 SR |
2093 | struct special_entry *field; |
2094 | ||
2095 | trace_assign_type(field, entry); | |
777e208d | 2096 | |
88a4216c | 2097 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
2098 | field->arg1, |
2099 | field->arg2, | |
2100 | field->arg3); | |
f0a920d5 | 2101 | if (!ret) |
2c4f035f | 2102 | return TRACE_TYPE_PARTIAL_LINE; |
f0a920d5 | 2103 | break; |
777e208d SR |
2104 | } |
2105 | case TRACE_PRINT: { | |
7104f300 SR |
2106 | struct print_entry *field; |
2107 | ||
2108 | trace_assign_type(field, entry); | |
777e208d SR |
2109 | |
2110 | trace_seq_printf(s, "# %lx %s", field->ip, field->buf); | |
2111 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
2112 | trace_seq_print_cont(s, iter); |
2113 | break; | |
f9896bf3 | 2114 | } |
777e208d | 2115 | } |
2c4f035f | 2116 | return TRACE_TYPE_HANDLED; |
f9896bf3 IM |
2117 | } |
2118 | ||
cb0f12aa IM |
2119 | #define SEQ_PUT_FIELD_RET(s, x) \ |
2120 | do { \ | |
2121 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ | |
2122 | return 0; \ | |
2123 | } while (0) | |
2124 | ||
5e3ca0ec IM |
2125 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
2126 | do { \ | |
ad0a3b68 | 2127 | BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES); \ |
5e3ca0ec IM |
2128 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ |
2129 | return 0; \ | |
2130 | } while (0) | |
2131 | ||
2c4f035f | 2132 | static enum print_line_t print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec IM |
2133 | { |
2134 | struct trace_seq *s = &iter->seq; | |
2135 | unsigned char newline = '\n'; | |
2136 | struct trace_entry *entry; | |
bac524d3 | 2137 | int S, T; |
5e3ca0ec IM |
2138 | |
2139 | entry = iter->ent; | |
dd0e545f SR |
2140 | |
2141 | if (entry->type == TRACE_CONT) | |
2c4f035f | 2142 | return TRACE_TYPE_HANDLED; |
dd0e545f | 2143 | |
777e208d | 2144 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); |
5e3ca0ec | 2145 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); |
3928a8a2 | 2146 | SEQ_PUT_HEX_FIELD_RET(s, iter->ts); |
5e3ca0ec IM |
2147 | |
2148 | switch (entry->type) { | |
777e208d | 2149 | case TRACE_FN: { |
7104f300 SR |
2150 | struct ftrace_entry *field; |
2151 | ||
2152 | trace_assign_type(field, entry); | |
777e208d SR |
2153 | |
2154 | SEQ_PUT_HEX_FIELD_RET(s, field->ip); | |
2155 | SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip); | |
5e3ca0ec | 2156 | break; |
777e208d | 2157 | } |
5e3ca0ec | 2158 | case TRACE_CTX: |
777e208d | 2159 | case TRACE_WAKE: { |
7104f300 SR |
2160 | struct ctx_switch_entry *field; |
2161 | ||
2162 | trace_assign_type(field, entry); | |
777e208d SR |
2163 | |
2164 | S = field->prev_state < sizeof(state_to_char) ? | |
2165 | state_to_char[field->prev_state] : 'X'; | |
2166 | T = field->next_state < sizeof(state_to_char) ? | |
2167 | state_to_char[field->next_state] : 'X'; | |
57422797 IM |
2168 | if (entry->type == TRACE_WAKE) |
2169 | S = '+'; | |
777e208d SR |
2170 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid); |
2171 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio); | |
5e3ca0ec | 2172 | SEQ_PUT_HEX_FIELD_RET(s, S); |
777e208d SR |
2173 | SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu); |
2174 | SEQ_PUT_HEX_FIELD_RET(s, field->next_pid); | |
2175 | SEQ_PUT_HEX_FIELD_RET(s, field->next_prio); | |
bac524d3 | 2176 | SEQ_PUT_HEX_FIELD_RET(s, T); |
5e3ca0ec | 2177 | break; |
777e208d | 2178 | } |
5e3ca0ec | 2179 | case TRACE_SPECIAL: |
02b67518 | 2180 | case TRACE_USER_STACK: |
777e208d | 2181 | case TRACE_STACK: { |
7104f300 SR |
2182 | struct special_entry *field; |
2183 | ||
2184 | trace_assign_type(field, entry); | |
777e208d SR |
2185 | |
2186 | SEQ_PUT_HEX_FIELD_RET(s, field->arg1); | |
2187 | SEQ_PUT_HEX_FIELD_RET(s, field->arg2); | |
2188 | SEQ_PUT_HEX_FIELD_RET(s, field->arg3); | |
5e3ca0ec IM |
2189 | break; |
2190 | } | |
777e208d | 2191 | } |
5e3ca0ec IM |
2192 | SEQ_PUT_FIELD_RET(s, newline); |
2193 | ||
2c4f035f | 2194 | return TRACE_TYPE_HANDLED; |
5e3ca0ec IM |
2195 | } |
2196 | ||
2c4f035f | 2197 | static enum print_line_t print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa IM |
2198 | { |
2199 | struct trace_seq *s = &iter->seq; | |
2200 | struct trace_entry *entry; | |
2201 | ||
2202 | entry = iter->ent; | |
dd0e545f SR |
2203 | |
2204 | if (entry->type == TRACE_CONT) | |
2c4f035f | 2205 | return TRACE_TYPE_HANDLED; |
dd0e545f | 2206 | |
777e208d | 2207 | SEQ_PUT_FIELD_RET(s, entry->pid); |
072ba498 | 2208 | SEQ_PUT_FIELD_RET(s, entry->cpu); |
3928a8a2 | 2209 | SEQ_PUT_FIELD_RET(s, iter->ts); |
cb0f12aa IM |
2210 | |
2211 | switch (entry->type) { | |
777e208d | 2212 | case TRACE_FN: { |
7104f300 SR |
2213 | struct ftrace_entry *field; |
2214 | ||
2215 | trace_assign_type(field, entry); | |
777e208d SR |
2216 | |
2217 | SEQ_PUT_FIELD_RET(s, field->ip); | |
2218 | SEQ_PUT_FIELD_RET(s, field->parent_ip); | |
cb0f12aa | 2219 | break; |
777e208d SR |
2220 | } |
2221 | case TRACE_CTX: { | |
7104f300 SR |
2222 | struct ctx_switch_entry *field; |
2223 | ||
2224 | trace_assign_type(field, entry); | |
777e208d SR |
2225 | |
2226 | SEQ_PUT_FIELD_RET(s, field->prev_pid); | |
2227 | SEQ_PUT_FIELD_RET(s, field->prev_prio); | |
2228 | SEQ_PUT_FIELD_RET(s, field->prev_state); | |
2229 | SEQ_PUT_FIELD_RET(s, field->next_pid); | |
2230 | SEQ_PUT_FIELD_RET(s, field->next_prio); | |
2231 | SEQ_PUT_FIELD_RET(s, field->next_state); | |
cb0f12aa | 2232 | break; |
777e208d | 2233 | } |
f0a920d5 | 2234 | case TRACE_SPECIAL: |
02b67518 | 2235 | case TRACE_USER_STACK: |
777e208d | 2236 | case TRACE_STACK: { |
7104f300 SR |
2237 | struct special_entry *field; |
2238 | ||
2239 | trace_assign_type(field, entry); | |
777e208d SR |
2240 | |
2241 | SEQ_PUT_FIELD_RET(s, field->arg1); | |
2242 | SEQ_PUT_FIELD_RET(s, field->arg2); | |
2243 | SEQ_PUT_FIELD_RET(s, field->arg3); | |
f0a920d5 | 2244 | break; |
cb0f12aa | 2245 | } |
777e208d | 2246 | } |
cb0f12aa IM |
2247 | return 1; |
2248 | } | |
2249 | ||
bc0c38d1 SR |
2250 | static int trace_empty(struct trace_iterator *iter) |
2251 | { | |
bc0c38d1 SR |
2252 | int cpu; |
2253 | ||
ab46428c | 2254 | for_each_tracing_cpu(cpu) { |
d769041f SR |
2255 | if (iter->buffer_iter[cpu]) { |
2256 | if (!ring_buffer_iter_empty(iter->buffer_iter[cpu])) | |
2257 | return 0; | |
2258 | } else { | |
2259 | if (!ring_buffer_empty_cpu(iter->tr->buffer, cpu)) | |
2260 | return 0; | |
2261 | } | |
bc0c38d1 | 2262 | } |
d769041f | 2263 | |
797d3712 | 2264 | return 1; |
bc0c38d1 SR |
2265 | } |
2266 | ||
2c4f035f | 2267 | static enum print_line_t print_trace_line(struct trace_iterator *iter) |
f9896bf3 | 2268 | { |
2c4f035f FW |
2269 | enum print_line_t ret; |
2270 | ||
2271 | if (iter->trace && iter->trace->print_line) { | |
2272 | ret = iter->trace->print_line(iter); | |
2273 | if (ret != TRACE_TYPE_UNHANDLED) | |
2274 | return ret; | |
2275 | } | |
72829bc3 | 2276 | |
cb0f12aa IM |
2277 | if (trace_flags & TRACE_ITER_BIN) |
2278 | return print_bin_fmt(iter); | |
2279 | ||
5e3ca0ec IM |
2280 | if (trace_flags & TRACE_ITER_HEX) |
2281 | return print_hex_fmt(iter); | |
2282 | ||
f9896bf3 IM |
2283 | if (trace_flags & TRACE_ITER_RAW) |
2284 | return print_raw_fmt(iter); | |
2285 | ||
2286 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
2287 | return print_lat_fmt(iter, iter->idx, iter->cpu); | |
2288 | ||
2289 | return print_trace_fmt(iter); | |
2290 | } | |
2291 | ||
bc0c38d1 SR |
2292 | static int s_show(struct seq_file *m, void *v) |
2293 | { | |
2294 | struct trace_iterator *iter = v; | |
2295 | ||
2296 | if (iter->ent == NULL) { | |
2297 | if (iter->tr) { | |
2298 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
2299 | seq_puts(m, "#\n"); | |
2300 | } | |
8bba1bf5 MM |
2301 | if (iter->trace && iter->trace->print_header) |
2302 | iter->trace->print_header(m); | |
2303 | else if (iter->iter_flags & TRACE_FILE_LAT_FMT) { | |
bc0c38d1 SR |
2304 | /* print nothing if the buffers are empty */ |
2305 | if (trace_empty(iter)) | |
2306 | return 0; | |
2307 | print_trace_header(m, iter); | |
2308 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
2309 | print_lat_help_header(m); | |
2310 | } else { | |
2311 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
2312 | print_func_help_header(m); | |
2313 | } | |
2314 | } else { | |
f9896bf3 | 2315 | print_trace_line(iter); |
214023c3 | 2316 | trace_print_seq(m, &iter->seq); |
bc0c38d1 SR |
2317 | } |
2318 | ||
2319 | return 0; | |
2320 | } | |
2321 | ||
2322 | static struct seq_operations tracer_seq_ops = { | |
4bf39a94 IM |
2323 | .start = s_start, |
2324 | .next = s_next, | |
2325 | .stop = s_stop, | |
2326 | .show = s_show, | |
bc0c38d1 SR |
2327 | }; |
2328 | ||
e309b41d | 2329 | static struct trace_iterator * |
bc0c38d1 SR |
2330 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
2331 | { | |
2332 | struct trace_iterator *iter; | |
3928a8a2 SR |
2333 | struct seq_file *m; |
2334 | int cpu; | |
bc0c38d1 | 2335 | |
60a11774 SR |
2336 | if (tracing_disabled) { |
2337 | *ret = -ENODEV; | |
2338 | return NULL; | |
2339 | } | |
2340 | ||
bc0c38d1 SR |
2341 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
2342 | if (!iter) { | |
2343 | *ret = -ENOMEM; | |
2344 | goto out; | |
2345 | } | |
2346 | ||
2347 | mutex_lock(&trace_types_lock); | |
2348 | if (current_trace && current_trace->print_max) | |
2349 | iter->tr = &max_tr; | |
2350 | else | |
2351 | iter->tr = inode->i_private; | |
2352 | iter->trace = current_trace; | |
2353 | iter->pos = -1; | |
2354 | ||
8bba1bf5 MM |
2355 | /* Notify the tracer early; before we stop tracing. */ |
2356 | if (iter->trace && iter->trace->open) | |
2357 | iter->trace->open(iter); | |
2358 | ||
12ef7d44 SR |
2359 | /* Annotate start of buffers if we had overruns */ |
2360 | if (ring_buffer_overruns(iter->tr->buffer)) | |
2361 | iter->iter_flags |= TRACE_FILE_ANNOTATE; | |
2362 | ||
2363 | ||
3928a8a2 | 2364 | for_each_tracing_cpu(cpu) { |
d769041f | 2365 | |
3928a8a2 SR |
2366 | iter->buffer_iter[cpu] = |
2367 | ring_buffer_read_start(iter->tr->buffer, cpu); | |
d769041f | 2368 | |
3928a8a2 SR |
2369 | if (!iter->buffer_iter[cpu]) |
2370 | goto fail_buffer; | |
2371 | } | |
2372 | ||
bc0c38d1 SR |
2373 | /* TODO stop tracer */ |
2374 | *ret = seq_open(file, &tracer_seq_ops); | |
3928a8a2 SR |
2375 | if (*ret) |
2376 | goto fail_buffer; | |
bc0c38d1 | 2377 | |
3928a8a2 SR |
2378 | m = file->private_data; |
2379 | m->private = iter; | |
bc0c38d1 | 2380 | |
3928a8a2 | 2381 | /* stop the trace while dumping */ |
9036990d | 2382 | tracing_stop(); |
3928a8a2 | 2383 | |
bc0c38d1 SR |
2384 | mutex_unlock(&trace_types_lock); |
2385 | ||
2386 | out: | |
2387 | return iter; | |
3928a8a2 SR |
2388 | |
2389 | fail_buffer: | |
2390 | for_each_tracing_cpu(cpu) { | |
2391 | if (iter->buffer_iter[cpu]) | |
2392 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
2393 | } | |
2394 | mutex_unlock(&trace_types_lock); | |
0bb943c7 | 2395 | kfree(iter); |
3928a8a2 SR |
2396 | |
2397 | return ERR_PTR(-ENOMEM); | |
bc0c38d1 SR |
2398 | } |
2399 | ||
2400 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
2401 | { | |
60a11774 SR |
2402 | if (tracing_disabled) |
2403 | return -ENODEV; | |
2404 | ||
bc0c38d1 SR |
2405 | filp->private_data = inode->i_private; |
2406 | return 0; | |
2407 | } | |
2408 | ||
2409 | int tracing_release(struct inode *inode, struct file *file) | |
2410 | { | |
2411 | struct seq_file *m = (struct seq_file *)file->private_data; | |
2412 | struct trace_iterator *iter = m->private; | |
3928a8a2 | 2413 | int cpu; |
bc0c38d1 SR |
2414 | |
2415 | mutex_lock(&trace_types_lock); | |
3928a8a2 SR |
2416 | for_each_tracing_cpu(cpu) { |
2417 | if (iter->buffer_iter[cpu]) | |
2418 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
2419 | } | |
2420 | ||
bc0c38d1 SR |
2421 | if (iter->trace && iter->trace->close) |
2422 | iter->trace->close(iter); | |
2423 | ||
2424 | /* reenable tracing if it was previously enabled */ | |
9036990d | 2425 | tracing_start(); |
bc0c38d1 SR |
2426 | mutex_unlock(&trace_types_lock); |
2427 | ||
2428 | seq_release(inode, file); | |
2429 | kfree(iter); | |
2430 | return 0; | |
2431 | } | |
2432 | ||
2433 | static int tracing_open(struct inode *inode, struct file *file) | |
2434 | { | |
2435 | int ret; | |
2436 | ||
2437 | __tracing_open(inode, file, &ret); | |
2438 | ||
2439 | return ret; | |
2440 | } | |
2441 | ||
2442 | static int tracing_lt_open(struct inode *inode, struct file *file) | |
2443 | { | |
2444 | struct trace_iterator *iter; | |
2445 | int ret; | |
2446 | ||
2447 | iter = __tracing_open(inode, file, &ret); | |
2448 | ||
2449 | if (!ret) | |
2450 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
2451 | ||
2452 | return ret; | |
2453 | } | |
2454 | ||
2455 | ||
e309b41d | 2456 | static void * |
bc0c38d1 SR |
2457 | t_next(struct seq_file *m, void *v, loff_t *pos) |
2458 | { | |
2459 | struct tracer *t = m->private; | |
2460 | ||
2461 | (*pos)++; | |
2462 | ||
2463 | if (t) | |
2464 | t = t->next; | |
2465 | ||
2466 | m->private = t; | |
2467 | ||
2468 | return t; | |
2469 | } | |
2470 | ||
2471 | static void *t_start(struct seq_file *m, loff_t *pos) | |
2472 | { | |
2473 | struct tracer *t = m->private; | |
2474 | loff_t l = 0; | |
2475 | ||
2476 | mutex_lock(&trace_types_lock); | |
2477 | for (; t && l < *pos; t = t_next(m, t, &l)) | |
2478 | ; | |
2479 | ||
2480 | return t; | |
2481 | } | |
2482 | ||
2483 | static void t_stop(struct seq_file *m, void *p) | |
2484 | { | |
2485 | mutex_unlock(&trace_types_lock); | |
2486 | } | |
2487 | ||
2488 | static int t_show(struct seq_file *m, void *v) | |
2489 | { | |
2490 | struct tracer *t = v; | |
2491 | ||
2492 | if (!t) | |
2493 | return 0; | |
2494 | ||
2495 | seq_printf(m, "%s", t->name); | |
2496 | if (t->next) | |
2497 | seq_putc(m, ' '); | |
2498 | else | |
2499 | seq_putc(m, '\n'); | |
2500 | ||
2501 | return 0; | |
2502 | } | |
2503 | ||
2504 | static struct seq_operations show_traces_seq_ops = { | |
4bf39a94 IM |
2505 | .start = t_start, |
2506 | .next = t_next, | |
2507 | .stop = t_stop, | |
2508 | .show = t_show, | |
bc0c38d1 SR |
2509 | }; |
2510 | ||
2511 | static int show_traces_open(struct inode *inode, struct file *file) | |
2512 | { | |
2513 | int ret; | |
2514 | ||
60a11774 SR |
2515 | if (tracing_disabled) |
2516 | return -ENODEV; | |
2517 | ||
bc0c38d1 SR |
2518 | ret = seq_open(file, &show_traces_seq_ops); |
2519 | if (!ret) { | |
2520 | struct seq_file *m = file->private_data; | |
2521 | m->private = trace_types; | |
2522 | } | |
2523 | ||
2524 | return ret; | |
2525 | } | |
2526 | ||
2527 | static struct file_operations tracing_fops = { | |
4bf39a94 IM |
2528 | .open = tracing_open, |
2529 | .read = seq_read, | |
2530 | .llseek = seq_lseek, | |
2531 | .release = tracing_release, | |
bc0c38d1 SR |
2532 | }; |
2533 | ||
2534 | static struct file_operations tracing_lt_fops = { | |
4bf39a94 IM |
2535 | .open = tracing_lt_open, |
2536 | .read = seq_read, | |
2537 | .llseek = seq_lseek, | |
2538 | .release = tracing_release, | |
bc0c38d1 SR |
2539 | }; |
2540 | ||
2541 | static struct file_operations show_traces_fops = { | |
c7078de1 IM |
2542 | .open = show_traces_open, |
2543 | .read = seq_read, | |
2544 | .release = seq_release, | |
2545 | }; | |
2546 | ||
36dfe925 IM |
2547 | /* |
2548 | * Only trace on a CPU if the bitmask is set: | |
2549 | */ | |
2550 | static cpumask_t tracing_cpumask = CPU_MASK_ALL; | |
2551 | ||
2552 | /* | |
2553 | * When tracing/tracing_cpu_mask is modified then this holds | |
2554 | * the new bitmask we are about to install: | |
2555 | */ | |
2556 | static cpumask_t tracing_cpumask_new; | |
2557 | ||
2558 | /* | |
2559 | * The tracer itself will not take this lock, but still we want | |
2560 | * to provide a consistent cpumask to user-space: | |
2561 | */ | |
2562 | static DEFINE_MUTEX(tracing_cpumask_update_lock); | |
2563 | ||
2564 | /* | |
2565 | * Temporary storage for the character representation of the | |
2566 | * CPU bitmask (and one more byte for the newline): | |
2567 | */ | |
2568 | static char mask_str[NR_CPUS + 1]; | |
2569 | ||
c7078de1 IM |
2570 | static ssize_t |
2571 | tracing_cpumask_read(struct file *filp, char __user *ubuf, | |
2572 | size_t count, loff_t *ppos) | |
2573 | { | |
36dfe925 | 2574 | int len; |
c7078de1 IM |
2575 | |
2576 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 IM |
2577 | |
2578 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); | |
2579 | if (count - len < 2) { | |
2580 | count = -EINVAL; | |
2581 | goto out_err; | |
2582 | } | |
2583 | len += sprintf(mask_str + len, "\n"); | |
2584 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); | |
2585 | ||
2586 | out_err: | |
c7078de1 IM |
2587 | mutex_unlock(&tracing_cpumask_update_lock); |
2588 | ||
2589 | return count; | |
2590 | } | |
2591 | ||
2592 | static ssize_t | |
2593 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, | |
2594 | size_t count, loff_t *ppos) | |
2595 | { | |
36dfe925 | 2596 | int err, cpu; |
c7078de1 IM |
2597 | |
2598 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 | 2599 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
c7078de1 | 2600 | if (err) |
36dfe925 IM |
2601 | goto err_unlock; |
2602 | ||
92205c23 SR |
2603 | raw_local_irq_disable(); |
2604 | __raw_spin_lock(&ftrace_max_lock); | |
ab46428c | 2605 | for_each_tracing_cpu(cpu) { |
36dfe925 IM |
2606 | /* |
2607 | * Increase/decrease the disabled counter if we are | |
2608 | * about to flip a bit in the cpumask: | |
2609 | */ | |
2610 | if (cpu_isset(cpu, tracing_cpumask) && | |
2611 | !cpu_isset(cpu, tracing_cpumask_new)) { | |
2612 | atomic_inc(&global_trace.data[cpu]->disabled); | |
2613 | } | |
2614 | if (!cpu_isset(cpu, tracing_cpumask) && | |
2615 | cpu_isset(cpu, tracing_cpumask_new)) { | |
2616 | atomic_dec(&global_trace.data[cpu]->disabled); | |
2617 | } | |
2618 | } | |
92205c23 SR |
2619 | __raw_spin_unlock(&ftrace_max_lock); |
2620 | raw_local_irq_enable(); | |
36dfe925 IM |
2621 | |
2622 | tracing_cpumask = tracing_cpumask_new; | |
2623 | ||
2624 | mutex_unlock(&tracing_cpumask_update_lock); | |
c7078de1 IM |
2625 | |
2626 | return count; | |
36dfe925 IM |
2627 | |
2628 | err_unlock: | |
2629 | mutex_unlock(&tracing_cpumask_update_lock); | |
2630 | ||
2631 | return err; | |
c7078de1 IM |
2632 | } |
2633 | ||
2634 | static struct file_operations tracing_cpumask_fops = { | |
2635 | .open = tracing_open_generic, | |
2636 | .read = tracing_cpumask_read, | |
2637 | .write = tracing_cpumask_write, | |
bc0c38d1 SR |
2638 | }; |
2639 | ||
2640 | static ssize_t | |
ee6bce52 | 2641 | tracing_trace_options_read(struct file *filp, char __user *ubuf, |
bc0c38d1 SR |
2642 | size_t cnt, loff_t *ppos) |
2643 | { | |
adf9f195 | 2644 | int i; |
bc0c38d1 SR |
2645 | char *buf; |
2646 | int r = 0; | |
2647 | int len = 0; | |
adf9f195 FW |
2648 | u32 tracer_flags = current_trace->flags->val; |
2649 | struct tracer_opt *trace_opts = current_trace->flags->opts; | |
2650 | ||
bc0c38d1 SR |
2651 | |
2652 | /* calulate max size */ | |
2653 | for (i = 0; trace_options[i]; i++) { | |
2654 | len += strlen(trace_options[i]); | |
2655 | len += 3; /* "no" and space */ | |
2656 | } | |
2657 | ||
adf9f195 FW |
2658 | /* |
2659 | * Increase the size with names of options specific | |
2660 | * of the current tracer. | |
2661 | */ | |
2662 | for (i = 0; trace_opts[i].name; i++) { | |
2663 | len += strlen(trace_opts[i].name); | |
2664 | len += 3; /* "no" and space */ | |
2665 | } | |
2666 | ||
bc0c38d1 SR |
2667 | /* +2 for \n and \0 */ |
2668 | buf = kmalloc(len + 2, GFP_KERNEL); | |
2669 | if (!buf) | |
2670 | return -ENOMEM; | |
2671 | ||
2672 | for (i = 0; trace_options[i]; i++) { | |
2673 | if (trace_flags & (1 << i)) | |
2674 | r += sprintf(buf + r, "%s ", trace_options[i]); | |
2675 | else | |
2676 | r += sprintf(buf + r, "no%s ", trace_options[i]); | |
2677 | } | |
2678 | ||
adf9f195 FW |
2679 | for (i = 0; trace_opts[i].name; i++) { |
2680 | if (tracer_flags & trace_opts[i].bit) | |
2681 | r += sprintf(buf + r, "%s ", | |
2682 | trace_opts[i].name); | |
2683 | else | |
2684 | r += sprintf(buf + r, "no%s ", | |
2685 | trace_opts[i].name); | |
2686 | } | |
2687 | ||
bc0c38d1 SR |
2688 | r += sprintf(buf + r, "\n"); |
2689 | WARN_ON(r >= len + 2); | |
2690 | ||
36dfe925 | 2691 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2692 | |
2693 | kfree(buf); | |
2694 | ||
2695 | return r; | |
2696 | } | |
2697 | ||
adf9f195 FW |
2698 | /* Try to assign a tracer specific option */ |
2699 | static int set_tracer_option(struct tracer *trace, char *cmp, int neg) | |
2700 | { | |
2701 | struct tracer_flags *trace_flags = trace->flags; | |
2702 | struct tracer_opt *opts = NULL; | |
2703 | int ret = 0, i = 0; | |
2704 | int len; | |
2705 | ||
2706 | for (i = 0; trace_flags->opts[i].name; i++) { | |
2707 | opts = &trace_flags->opts[i]; | |
2708 | len = strlen(opts->name); | |
2709 | ||
2710 | if (strncmp(cmp, opts->name, len) == 0) { | |
2711 | ret = trace->set_flag(trace_flags->val, | |
2712 | opts->bit, !neg); | |
2713 | break; | |
2714 | } | |
2715 | } | |
2716 | /* Not found */ | |
2717 | if (!trace_flags->opts[i].name) | |
2718 | return -EINVAL; | |
2719 | ||
2720 | /* Refused to handle */ | |
2721 | if (ret) | |
2722 | return ret; | |
2723 | ||
2724 | if (neg) | |
2725 | trace_flags->val &= ~opts->bit; | |
2726 | else | |
2727 | trace_flags->val |= opts->bit; | |
2728 | ||
2729 | return 0; | |
2730 | } | |
2731 | ||
bc0c38d1 | 2732 | static ssize_t |
ee6bce52 | 2733 | tracing_trace_options_write(struct file *filp, const char __user *ubuf, |
bc0c38d1 SR |
2734 | size_t cnt, loff_t *ppos) |
2735 | { | |
2736 | char buf[64]; | |
2737 | char *cmp = buf; | |
2738 | int neg = 0; | |
adf9f195 | 2739 | int ret; |
bc0c38d1 SR |
2740 | int i; |
2741 | ||
cffae437 SR |
2742 | if (cnt >= sizeof(buf)) |
2743 | return -EINVAL; | |
bc0c38d1 SR |
2744 | |
2745 | if (copy_from_user(&buf, ubuf, cnt)) | |
2746 | return -EFAULT; | |
2747 | ||
2748 | buf[cnt] = 0; | |
2749 | ||
2750 | if (strncmp(buf, "no", 2) == 0) { | |
2751 | neg = 1; | |
2752 | cmp += 2; | |
2753 | } | |
2754 | ||
2755 | for (i = 0; trace_options[i]; i++) { | |
2756 | int len = strlen(trace_options[i]); | |
2757 | ||
2758 | if (strncmp(cmp, trace_options[i], len) == 0) { | |
2759 | if (neg) | |
2760 | trace_flags &= ~(1 << i); | |
2761 | else | |
2762 | trace_flags |= (1 << i); | |
2763 | break; | |
2764 | } | |
2765 | } | |
adf9f195 FW |
2766 | |
2767 | /* If no option could be set, test the specific tracer options */ | |
2768 | if (!trace_options[i]) { | |
2769 | ret = set_tracer_option(current_trace, cmp, neg); | |
2770 | if (ret) | |
2771 | return ret; | |
2772 | } | |
bc0c38d1 SR |
2773 | |
2774 | filp->f_pos += cnt; | |
2775 | ||
2776 | return cnt; | |
2777 | } | |
2778 | ||
2779 | static struct file_operations tracing_iter_fops = { | |
c7078de1 | 2780 | .open = tracing_open_generic, |
ee6bce52 SR |
2781 | .read = tracing_trace_options_read, |
2782 | .write = tracing_trace_options_write, | |
bc0c38d1 SR |
2783 | }; |
2784 | ||
7bd2f24c IM |
2785 | static const char readme_msg[] = |
2786 | "tracing mini-HOWTO:\n\n" | |
2787 | "# mkdir /debug\n" | |
2788 | "# mount -t debugfs nodev /debug\n\n" | |
2789 | "# cat /debug/tracing/available_tracers\n" | |
2790 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" | |
2791 | "# cat /debug/tracing/current_tracer\n" | |
2792 | "none\n" | |
2793 | "# echo sched_switch > /debug/tracing/current_tracer\n" | |
2794 | "# cat /debug/tracing/current_tracer\n" | |
2795 | "sched_switch\n" | |
ee6bce52 | 2796 | "# cat /debug/tracing/trace_options\n" |
7bd2f24c | 2797 | "noprint-parent nosym-offset nosym-addr noverbose\n" |
ee6bce52 | 2798 | "# echo print-parent > /debug/tracing/trace_options\n" |
7bd2f24c IM |
2799 | "# echo 1 > /debug/tracing/tracing_enabled\n" |
2800 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" | |
2801 | "echo 0 > /debug/tracing/tracing_enabled\n" | |
2802 | ; | |
2803 | ||
2804 | static ssize_t | |
2805 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
2806 | size_t cnt, loff_t *ppos) | |
2807 | { | |
2808 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
2809 | readme_msg, strlen(readme_msg)); | |
2810 | } | |
2811 | ||
2812 | static struct file_operations tracing_readme_fops = { | |
c7078de1 IM |
2813 | .open = tracing_open_generic, |
2814 | .read = tracing_readme_read, | |
7bd2f24c IM |
2815 | }; |
2816 | ||
bc0c38d1 SR |
2817 | static ssize_t |
2818 | tracing_ctrl_read(struct file *filp, char __user *ubuf, | |
2819 | size_t cnt, loff_t *ppos) | |
2820 | { | |
bc0c38d1 SR |
2821 | char buf[64]; |
2822 | int r; | |
2823 | ||
9036990d | 2824 | r = sprintf(buf, "%u\n", tracer_enabled); |
4e3c3333 | 2825 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2826 | } |
2827 | ||
2828 | static ssize_t | |
2829 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, | |
2830 | size_t cnt, loff_t *ppos) | |
2831 | { | |
2832 | struct trace_array *tr = filp->private_data; | |
bc0c38d1 | 2833 | char buf[64]; |
c6caeeb1 SR |
2834 | long val; |
2835 | int ret; | |
bc0c38d1 | 2836 | |
cffae437 SR |
2837 | if (cnt >= sizeof(buf)) |
2838 | return -EINVAL; | |
bc0c38d1 SR |
2839 | |
2840 | if (copy_from_user(&buf, ubuf, cnt)) | |
2841 | return -EFAULT; | |
2842 | ||
2843 | buf[cnt] = 0; | |
2844 | ||
c6caeeb1 SR |
2845 | ret = strict_strtoul(buf, 10, &val); |
2846 | if (ret < 0) | |
2847 | return ret; | |
bc0c38d1 SR |
2848 | |
2849 | val = !!val; | |
2850 | ||
2851 | mutex_lock(&trace_types_lock); | |
9036990d SR |
2852 | if (tracer_enabled ^ val) { |
2853 | if (val) { | |
bc0c38d1 | 2854 | tracer_enabled = 1; |
9036990d SR |
2855 | if (current_trace->start) |
2856 | current_trace->start(tr); | |
2857 | tracing_start(); | |
2858 | } else { | |
bc0c38d1 | 2859 | tracer_enabled = 0; |
9036990d SR |
2860 | tracing_stop(); |
2861 | if (current_trace->stop) | |
2862 | current_trace->stop(tr); | |
2863 | } | |
bc0c38d1 SR |
2864 | } |
2865 | mutex_unlock(&trace_types_lock); | |
2866 | ||
2867 | filp->f_pos += cnt; | |
2868 | ||
2869 | return cnt; | |
2870 | } | |
2871 | ||
2872 | static ssize_t | |
2873 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
2874 | size_t cnt, loff_t *ppos) | |
2875 | { | |
2876 | char buf[max_tracer_type_len+2]; | |
2877 | int r; | |
2878 | ||
2879 | mutex_lock(&trace_types_lock); | |
2880 | if (current_trace) | |
2881 | r = sprintf(buf, "%s\n", current_trace->name); | |
2882 | else | |
2883 | r = sprintf(buf, "\n"); | |
2884 | mutex_unlock(&trace_types_lock); | |
2885 | ||
4bf39a94 | 2886 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2887 | } |
2888 | ||
d9e54076 | 2889 | static int tracing_set_tracer(char *buf) |
bc0c38d1 SR |
2890 | { |
2891 | struct trace_array *tr = &global_trace; | |
2892 | struct tracer *t; | |
d9e54076 | 2893 | int ret = 0; |
bc0c38d1 SR |
2894 | |
2895 | mutex_lock(&trace_types_lock); | |
2896 | for (t = trace_types; t; t = t->next) { | |
2897 | if (strcmp(t->name, buf) == 0) | |
2898 | break; | |
2899 | } | |
c2931e05 FW |
2900 | if (!t) { |
2901 | ret = -EINVAL; | |
2902 | goto out; | |
2903 | } | |
2904 | if (t == current_trace) | |
bc0c38d1 SR |
2905 | goto out; |
2906 | ||
9f029e83 | 2907 | trace_branch_disable(); |
bc0c38d1 SR |
2908 | if (current_trace && current_trace->reset) |
2909 | current_trace->reset(tr); | |
2910 | ||
2911 | current_trace = t; | |
1c80025a FW |
2912 | if (t->init) { |
2913 | ret = t->init(tr); | |
2914 | if (ret) | |
2915 | goto out; | |
2916 | } | |
bc0c38d1 | 2917 | |
9f029e83 | 2918 | trace_branch_enable(tr); |
bc0c38d1 SR |
2919 | out: |
2920 | mutex_unlock(&trace_types_lock); | |
2921 | ||
d9e54076 PZ |
2922 | return ret; |
2923 | } | |
2924 | ||
2925 | static ssize_t | |
2926 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
2927 | size_t cnt, loff_t *ppos) | |
2928 | { | |
2929 | char buf[max_tracer_type_len+1]; | |
2930 | int i; | |
2931 | size_t ret; | |
e6e7a65a FW |
2932 | int err; |
2933 | ||
2934 | ret = cnt; | |
d9e54076 PZ |
2935 | |
2936 | if (cnt > max_tracer_type_len) | |
2937 | cnt = max_tracer_type_len; | |
2938 | ||
2939 | if (copy_from_user(&buf, ubuf, cnt)) | |
2940 | return -EFAULT; | |
2941 | ||
2942 | buf[cnt] = 0; | |
2943 | ||
2944 | /* strip ending whitespace. */ | |
2945 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
2946 | buf[i] = 0; | |
2947 | ||
e6e7a65a FW |
2948 | err = tracing_set_tracer(buf); |
2949 | if (err) | |
2950 | return err; | |
d9e54076 | 2951 | |
e6e7a65a | 2952 | filp->f_pos += ret; |
bc0c38d1 | 2953 | |
c2931e05 | 2954 | return ret; |
bc0c38d1 SR |
2955 | } |
2956 | ||
2957 | static ssize_t | |
2958 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
2959 | size_t cnt, loff_t *ppos) | |
2960 | { | |
2961 | unsigned long *ptr = filp->private_data; | |
2962 | char buf[64]; | |
2963 | int r; | |
2964 | ||
cffae437 | 2965 | r = snprintf(buf, sizeof(buf), "%ld\n", |
bc0c38d1 | 2966 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
cffae437 SR |
2967 | if (r > sizeof(buf)) |
2968 | r = sizeof(buf); | |
4bf39a94 | 2969 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2970 | } |
2971 | ||
2972 | static ssize_t | |
2973 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
2974 | size_t cnt, loff_t *ppos) | |
2975 | { | |
2976 | long *ptr = filp->private_data; | |
bc0c38d1 | 2977 | char buf[64]; |
c6caeeb1 SR |
2978 | long val; |
2979 | int ret; | |
bc0c38d1 | 2980 | |
cffae437 SR |
2981 | if (cnt >= sizeof(buf)) |
2982 | return -EINVAL; | |
bc0c38d1 SR |
2983 | |
2984 | if (copy_from_user(&buf, ubuf, cnt)) | |
2985 | return -EFAULT; | |
2986 | ||
2987 | buf[cnt] = 0; | |
2988 | ||
c6caeeb1 SR |
2989 | ret = strict_strtoul(buf, 10, &val); |
2990 | if (ret < 0) | |
2991 | return ret; | |
bc0c38d1 SR |
2992 | |
2993 | *ptr = val * 1000; | |
2994 | ||
2995 | return cnt; | |
2996 | } | |
2997 | ||
b3806b43 SR |
2998 | static atomic_t tracing_reader; |
2999 | ||
3000 | static int tracing_open_pipe(struct inode *inode, struct file *filp) | |
3001 | { | |
3002 | struct trace_iterator *iter; | |
3003 | ||
3004 | if (tracing_disabled) | |
3005 | return -ENODEV; | |
3006 | ||
3007 | /* We only allow for reader of the pipe */ | |
3008 | if (atomic_inc_return(&tracing_reader) != 1) { | |
3009 | atomic_dec(&tracing_reader); | |
3010 | return -EBUSY; | |
3011 | } | |
3012 | ||
3013 | /* create a buffer to store the information to pass to userspace */ | |
3014 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
3015 | if (!iter) | |
3016 | return -ENOMEM; | |
3017 | ||
107bad8b | 3018 | mutex_lock(&trace_types_lock); |
a309720c SR |
3019 | |
3020 | /* trace pipe does not show start of buffer */ | |
3021 | cpus_setall(iter->started); | |
3022 | ||
b3806b43 | 3023 | iter->tr = &global_trace; |
72829bc3 | 3024 | iter->trace = current_trace; |
b3806b43 SR |
3025 | filp->private_data = iter; |
3026 | ||
107bad8b SR |
3027 | if (iter->trace->pipe_open) |
3028 | iter->trace->pipe_open(iter); | |
3029 | mutex_unlock(&trace_types_lock); | |
3030 | ||
b3806b43 SR |
3031 | return 0; |
3032 | } | |
3033 | ||
3034 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
3035 | { | |
3036 | struct trace_iterator *iter = file->private_data; | |
3037 | ||
3038 | kfree(iter); | |
3039 | atomic_dec(&tracing_reader); | |
3040 | ||
3041 | return 0; | |
3042 | } | |
3043 | ||
2a2cc8f7 SSP |
3044 | static unsigned int |
3045 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) | |
3046 | { | |
3047 | struct trace_iterator *iter = filp->private_data; | |
3048 | ||
3049 | if (trace_flags & TRACE_ITER_BLOCK) { | |
3050 | /* | |
3051 | * Always select as readable when in blocking mode | |
3052 | */ | |
3053 | return POLLIN | POLLRDNORM; | |
afc2abc0 | 3054 | } else { |
2a2cc8f7 SSP |
3055 | if (!trace_empty(iter)) |
3056 | return POLLIN | POLLRDNORM; | |
3057 | poll_wait(filp, &trace_wait, poll_table); | |
3058 | if (!trace_empty(iter)) | |
3059 | return POLLIN | POLLRDNORM; | |
3060 | ||
3061 | return 0; | |
3062 | } | |
3063 | } | |
3064 | ||
b3806b43 SR |
3065 | /* |
3066 | * Consumer reader. | |
3067 | */ | |
3068 | static ssize_t | |
3069 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
3070 | size_t cnt, loff_t *ppos) | |
3071 | { | |
3072 | struct trace_iterator *iter = filp->private_data; | |
6c6c2796 | 3073 | ssize_t sret; |
b3806b43 SR |
3074 | |
3075 | /* return any leftover data */ | |
6c6c2796 PP |
3076 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
3077 | if (sret != -EBUSY) | |
3078 | return sret; | |
b3806b43 | 3079 | |
6c6c2796 | 3080 | trace_seq_reset(&iter->seq); |
b3806b43 | 3081 | |
107bad8b SR |
3082 | mutex_lock(&trace_types_lock); |
3083 | if (iter->trace->read) { | |
6c6c2796 PP |
3084 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); |
3085 | if (sret) | |
107bad8b | 3086 | goto out; |
107bad8b SR |
3087 | } |
3088 | ||
9ff4b974 PP |
3089 | waitagain: |
3090 | sret = 0; | |
b3806b43 | 3091 | while (trace_empty(iter)) { |
2dc8f095 | 3092 | |
107bad8b | 3093 | if ((filp->f_flags & O_NONBLOCK)) { |
6c6c2796 | 3094 | sret = -EAGAIN; |
107bad8b SR |
3095 | goto out; |
3096 | } | |
2dc8f095 | 3097 | |
b3806b43 SR |
3098 | /* |
3099 | * This is a make-shift waitqueue. The reason we don't use | |
3100 | * an actual wait queue is because: | |
3101 | * 1) we only ever have one waiter | |
3102 | * 2) the tracing, traces all functions, we don't want | |
3103 | * the overhead of calling wake_up and friends | |
3104 | * (and tracing them too) | |
3105 | * Anyway, this is really very primitive wakeup. | |
3106 | */ | |
3107 | set_current_state(TASK_INTERRUPTIBLE); | |
3108 | iter->tr->waiter = current; | |
3109 | ||
107bad8b SR |
3110 | mutex_unlock(&trace_types_lock); |
3111 | ||
9fe068e9 IM |
3112 | /* sleep for 100 msecs, and try again. */ |
3113 | schedule_timeout(HZ/10); | |
b3806b43 | 3114 | |
107bad8b SR |
3115 | mutex_lock(&trace_types_lock); |
3116 | ||
b3806b43 SR |
3117 | iter->tr->waiter = NULL; |
3118 | ||
107bad8b | 3119 | if (signal_pending(current)) { |
6c6c2796 | 3120 | sret = -EINTR; |
107bad8b SR |
3121 | goto out; |
3122 | } | |
b3806b43 | 3123 | |
84527997 | 3124 | if (iter->trace != current_trace) |
107bad8b | 3125 | goto out; |
84527997 | 3126 | |
b3806b43 SR |
3127 | /* |
3128 | * We block until we read something and tracing is disabled. | |
3129 | * We still block if tracing is disabled, but we have never | |
3130 | * read anything. This allows a user to cat this file, and | |
3131 | * then enable tracing. But after we have read something, | |
3132 | * we give an EOF when tracing is again disabled. | |
3133 | * | |
3134 | * iter->pos will be 0 if we haven't read anything. | |
3135 | */ | |
3136 | if (!tracer_enabled && iter->pos) | |
3137 | break; | |
3138 | ||
3139 | continue; | |
3140 | } | |
3141 | ||
3142 | /* stop when tracing is finished */ | |
3143 | if (trace_empty(iter)) | |
107bad8b | 3144 | goto out; |
b3806b43 SR |
3145 | |
3146 | if (cnt >= PAGE_SIZE) | |
3147 | cnt = PAGE_SIZE - 1; | |
3148 | ||
53d0aa77 | 3149 | /* reset all but tr, trace, and overruns */ |
53d0aa77 SR |
3150 | memset(&iter->seq, 0, |
3151 | sizeof(struct trace_iterator) - | |
3152 | offsetof(struct trace_iterator, seq)); | |
4823ed7e | 3153 | iter->pos = -1; |
b3806b43 | 3154 | |
088b1e42 | 3155 | while (find_next_entry_inc(iter) != NULL) { |
2c4f035f | 3156 | enum print_line_t ret; |
088b1e42 SR |
3157 | int len = iter->seq.len; |
3158 | ||
f9896bf3 | 3159 | ret = print_trace_line(iter); |
2c4f035f | 3160 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
088b1e42 SR |
3161 | /* don't print partial lines */ |
3162 | iter->seq.len = len; | |
b3806b43 | 3163 | break; |
088b1e42 | 3164 | } |
b3806b43 SR |
3165 | |
3166 | trace_consume(iter); | |
3167 | ||
3168 | if (iter->seq.len >= cnt) | |
3169 | break; | |
b3806b43 SR |
3170 | } |
3171 | ||
b3806b43 | 3172 | /* Now copy what we have to the user */ |
6c6c2796 PP |
3173 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
3174 | if (iter->seq.readpos >= iter->seq.len) | |
b3806b43 | 3175 | trace_seq_reset(&iter->seq); |
9ff4b974 PP |
3176 | |
3177 | /* | |
3178 | * If there was nothing to send to user, inspite of consuming trace | |
3179 | * entries, go back to wait for more entries. | |
3180 | */ | |
6c6c2796 | 3181 | if (sret == -EBUSY) |
9ff4b974 | 3182 | goto waitagain; |
b3806b43 | 3183 | |
107bad8b SR |
3184 | out: |
3185 | mutex_unlock(&trace_types_lock); | |
3186 | ||
6c6c2796 | 3187 | return sret; |
b3806b43 SR |
3188 | } |
3189 | ||
a98a3c3f SR |
3190 | static ssize_t |
3191 | tracing_entries_read(struct file *filp, char __user *ubuf, | |
3192 | size_t cnt, loff_t *ppos) | |
3193 | { | |
3194 | struct trace_array *tr = filp->private_data; | |
3195 | char buf[64]; | |
3196 | int r; | |
3197 | ||
1696b2b0 | 3198 | r = sprintf(buf, "%lu\n", tr->entries >> 10); |
a98a3c3f SR |
3199 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
3200 | } | |
3201 | ||
3202 | static ssize_t | |
3203 | tracing_entries_write(struct file *filp, const char __user *ubuf, | |
3204 | size_t cnt, loff_t *ppos) | |
3205 | { | |
3206 | unsigned long val; | |
3207 | char buf[64]; | |
bf5e6519 | 3208 | int ret, cpu; |
a98a3c3f | 3209 | |
cffae437 SR |
3210 | if (cnt >= sizeof(buf)) |
3211 | return -EINVAL; | |
a98a3c3f SR |
3212 | |
3213 | if (copy_from_user(&buf, ubuf, cnt)) | |
3214 | return -EFAULT; | |
3215 | ||
3216 | buf[cnt] = 0; | |
3217 | ||
c6caeeb1 SR |
3218 | ret = strict_strtoul(buf, 10, &val); |
3219 | if (ret < 0) | |
3220 | return ret; | |
a98a3c3f SR |
3221 | |
3222 | /* must have at least 1 entry */ | |
3223 | if (!val) | |
3224 | return -EINVAL; | |
3225 | ||
3226 | mutex_lock(&trace_types_lock); | |
3227 | ||
c76f0694 | 3228 | tracing_stop(); |
a98a3c3f | 3229 | |
bf5e6519 SR |
3230 | /* disable all cpu buffers */ |
3231 | for_each_tracing_cpu(cpu) { | |
3232 | if (global_trace.data[cpu]) | |
3233 | atomic_inc(&global_trace.data[cpu]->disabled); | |
3234 | if (max_tr.data[cpu]) | |
3235 | atomic_inc(&max_tr.data[cpu]->disabled); | |
3236 | } | |
3237 | ||
1696b2b0 SR |
3238 | /* value is in KB */ |
3239 | val <<= 10; | |
3240 | ||
3928a8a2 SR |
3241 | if (val != global_trace.entries) { |
3242 | ret = ring_buffer_resize(global_trace.buffer, val); | |
3243 | if (ret < 0) { | |
3244 | cnt = ret; | |
3eefae99 SR |
3245 | goto out; |
3246 | } | |
3247 | ||
3928a8a2 SR |
3248 | ret = ring_buffer_resize(max_tr.buffer, val); |
3249 | if (ret < 0) { | |
3250 | int r; | |
3251 | cnt = ret; | |
3252 | r = ring_buffer_resize(global_trace.buffer, | |
3253 | global_trace.entries); | |
3254 | if (r < 0) { | |
3255 | /* AARGH! We are left with different | |
3256 | * size max buffer!!!! */ | |
3257 | WARN_ON(1); | |
3258 | tracing_disabled = 1; | |
a98a3c3f | 3259 | } |
3928a8a2 | 3260 | goto out; |
a98a3c3f | 3261 | } |
3eefae99 | 3262 | |
3928a8a2 | 3263 | global_trace.entries = val; |
a98a3c3f SR |
3264 | } |
3265 | ||
3266 | filp->f_pos += cnt; | |
3267 | ||
19384c03 SR |
3268 | /* If check pages failed, return ENOMEM */ |
3269 | if (tracing_disabled) | |
3270 | cnt = -ENOMEM; | |
a98a3c3f | 3271 | out: |
bf5e6519 SR |
3272 | for_each_tracing_cpu(cpu) { |
3273 | if (global_trace.data[cpu]) | |
3274 | atomic_dec(&global_trace.data[cpu]->disabled); | |
3275 | if (max_tr.data[cpu]) | |
3276 | atomic_dec(&max_tr.data[cpu]->disabled); | |
3277 | } | |
3278 | ||
c76f0694 | 3279 | tracing_start(); |
a98a3c3f SR |
3280 | max_tr.entries = global_trace.entries; |
3281 | mutex_unlock(&trace_types_lock); | |
3282 | ||
3283 | return cnt; | |
3284 | } | |
3285 | ||
5bf9a1ee PP |
3286 | static int mark_printk(const char *fmt, ...) |
3287 | { | |
3288 | int ret; | |
3289 | va_list args; | |
3290 | va_start(args, fmt); | |
3291 | ret = trace_vprintk(0, fmt, args); | |
3292 | va_end(args); | |
3293 | return ret; | |
3294 | } | |
3295 | ||
3296 | static ssize_t | |
3297 | tracing_mark_write(struct file *filp, const char __user *ubuf, | |
3298 | size_t cnt, loff_t *fpos) | |
3299 | { | |
3300 | char *buf; | |
3301 | char *end; | |
5bf9a1ee | 3302 | |
c76f0694 | 3303 | if (tracing_disabled) |
5bf9a1ee PP |
3304 | return -EINVAL; |
3305 | ||
3306 | if (cnt > TRACE_BUF_SIZE) | |
3307 | cnt = TRACE_BUF_SIZE; | |
3308 | ||
3309 | buf = kmalloc(cnt + 1, GFP_KERNEL); | |
3310 | if (buf == NULL) | |
3311 | return -ENOMEM; | |
3312 | ||
3313 | if (copy_from_user(buf, ubuf, cnt)) { | |
3314 | kfree(buf); | |
3315 | return -EFAULT; | |
3316 | } | |
3317 | ||
3318 | /* Cut from the first nil or newline. */ | |
3319 | buf[cnt] = '\0'; | |
3320 | end = strchr(buf, '\n'); | |
3321 | if (end) | |
3322 | *end = '\0'; | |
3323 | ||
3324 | cnt = mark_printk("%s\n", buf); | |
3325 | kfree(buf); | |
3326 | *fpos += cnt; | |
3327 | ||
3328 | return cnt; | |
3329 | } | |
3330 | ||
bc0c38d1 | 3331 | static struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
3332 | .open = tracing_open_generic, |
3333 | .read = tracing_max_lat_read, | |
3334 | .write = tracing_max_lat_write, | |
bc0c38d1 SR |
3335 | }; |
3336 | ||
3337 | static struct file_operations tracing_ctrl_fops = { | |
4bf39a94 IM |
3338 | .open = tracing_open_generic, |
3339 | .read = tracing_ctrl_read, | |
3340 | .write = tracing_ctrl_write, | |
bc0c38d1 SR |
3341 | }; |
3342 | ||
3343 | static struct file_operations set_tracer_fops = { | |
4bf39a94 IM |
3344 | .open = tracing_open_generic, |
3345 | .read = tracing_set_trace_read, | |
3346 | .write = tracing_set_trace_write, | |
bc0c38d1 SR |
3347 | }; |
3348 | ||
b3806b43 | 3349 | static struct file_operations tracing_pipe_fops = { |
4bf39a94 | 3350 | .open = tracing_open_pipe, |
2a2cc8f7 | 3351 | .poll = tracing_poll_pipe, |
4bf39a94 IM |
3352 | .read = tracing_read_pipe, |
3353 | .release = tracing_release_pipe, | |
b3806b43 SR |
3354 | }; |
3355 | ||
a98a3c3f SR |
3356 | static struct file_operations tracing_entries_fops = { |
3357 | .open = tracing_open_generic, | |
3358 | .read = tracing_entries_read, | |
3359 | .write = tracing_entries_write, | |
3360 | }; | |
3361 | ||
5bf9a1ee | 3362 | static struct file_operations tracing_mark_fops = { |
43a15386 | 3363 | .open = tracing_open_generic, |
5bf9a1ee PP |
3364 | .write = tracing_mark_write, |
3365 | }; | |
3366 | ||
bc0c38d1 SR |
3367 | #ifdef CONFIG_DYNAMIC_FTRACE |
3368 | ||
b807c3d0 SR |
3369 | int __weak ftrace_arch_read_dyn_info(char *buf, int size) |
3370 | { | |
3371 | return 0; | |
3372 | } | |
3373 | ||
bc0c38d1 | 3374 | static ssize_t |
b807c3d0 | 3375 | tracing_read_dyn_info(struct file *filp, char __user *ubuf, |
bc0c38d1 SR |
3376 | size_t cnt, loff_t *ppos) |
3377 | { | |
a26a2a27 SR |
3378 | static char ftrace_dyn_info_buffer[1024]; |
3379 | static DEFINE_MUTEX(dyn_info_mutex); | |
bc0c38d1 | 3380 | unsigned long *p = filp->private_data; |
b807c3d0 | 3381 | char *buf = ftrace_dyn_info_buffer; |
a26a2a27 | 3382 | int size = ARRAY_SIZE(ftrace_dyn_info_buffer); |
bc0c38d1 SR |
3383 | int r; |
3384 | ||
b807c3d0 SR |
3385 | mutex_lock(&dyn_info_mutex); |
3386 | r = sprintf(buf, "%ld ", *p); | |
4bf39a94 | 3387 | |
a26a2a27 | 3388 | r += ftrace_arch_read_dyn_info(buf+r, (size-1)-r); |
b807c3d0 SR |
3389 | buf[r++] = '\n'; |
3390 | ||
3391 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
3392 | ||
3393 | mutex_unlock(&dyn_info_mutex); | |
3394 | ||
3395 | return r; | |
bc0c38d1 SR |
3396 | } |
3397 | ||
b807c3d0 | 3398 | static struct file_operations tracing_dyn_info_fops = { |
4bf39a94 | 3399 | .open = tracing_open_generic, |
b807c3d0 | 3400 | .read = tracing_read_dyn_info, |
bc0c38d1 SR |
3401 | }; |
3402 | #endif | |
3403 | ||
3404 | static struct dentry *d_tracer; | |
3405 | ||
3406 | struct dentry *tracing_init_dentry(void) | |
3407 | { | |
3408 | static int once; | |
3409 | ||
3410 | if (d_tracer) | |
3411 | return d_tracer; | |
3412 | ||
3413 | d_tracer = debugfs_create_dir("tracing", NULL); | |
3414 | ||
3415 | if (!d_tracer && !once) { | |
3416 | once = 1; | |
3417 | pr_warning("Could not create debugfs directory 'tracing'\n"); | |
3418 | return NULL; | |
3419 | } | |
3420 | ||
3421 | return d_tracer; | |
3422 | } | |
3423 | ||
60a11774 SR |
3424 | #ifdef CONFIG_FTRACE_SELFTEST |
3425 | /* Let selftest have access to static functions in this file */ | |
3426 | #include "trace_selftest.c" | |
3427 | #endif | |
3428 | ||
b5ad384e | 3429 | static __init int tracer_init_debugfs(void) |
bc0c38d1 SR |
3430 | { |
3431 | struct dentry *d_tracer; | |
3432 | struct dentry *entry; | |
3433 | ||
3434 | d_tracer = tracing_init_dentry(); | |
3435 | ||
3436 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, | |
3437 | &global_trace, &tracing_ctrl_fops); | |
3438 | if (!entry) | |
3439 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); | |
3440 | ||
ee6bce52 | 3441 | entry = debugfs_create_file("trace_options", 0644, d_tracer, |
bc0c38d1 SR |
3442 | NULL, &tracing_iter_fops); |
3443 | if (!entry) | |
ee6bce52 | 3444 | pr_warning("Could not create debugfs 'trace_options' entry\n"); |
bc0c38d1 | 3445 | |
c7078de1 IM |
3446 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
3447 | NULL, &tracing_cpumask_fops); | |
3448 | if (!entry) | |
3449 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); | |
3450 | ||
bc0c38d1 SR |
3451 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
3452 | &global_trace, &tracing_lt_fops); | |
3453 | if (!entry) | |
3454 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); | |
3455 | ||
3456 | entry = debugfs_create_file("trace", 0444, d_tracer, | |
3457 | &global_trace, &tracing_fops); | |
3458 | if (!entry) | |
3459 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
3460 | ||
3461 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, | |
3462 | &global_trace, &show_traces_fops); | |
3463 | if (!entry) | |
98a983aa | 3464 | pr_warning("Could not create debugfs 'available_tracers' entry\n"); |
bc0c38d1 SR |
3465 | |
3466 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, | |
3467 | &global_trace, &set_tracer_fops); | |
3468 | if (!entry) | |
98a983aa | 3469 | pr_warning("Could not create debugfs 'current_tracer' entry\n"); |
bc0c38d1 SR |
3470 | |
3471 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, | |
3472 | &tracing_max_latency, | |
3473 | &tracing_max_lat_fops); | |
3474 | if (!entry) | |
3475 | pr_warning("Could not create debugfs " | |
3476 | "'tracing_max_latency' entry\n"); | |
3477 | ||
3478 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, | |
3479 | &tracing_thresh, &tracing_max_lat_fops); | |
3480 | if (!entry) | |
3481 | pr_warning("Could not create debugfs " | |
98a983aa | 3482 | "'tracing_thresh' entry\n"); |
7bd2f24c IM |
3483 | entry = debugfs_create_file("README", 0644, d_tracer, |
3484 | NULL, &tracing_readme_fops); | |
3485 | if (!entry) | |
3486 | pr_warning("Could not create debugfs 'README' entry\n"); | |
3487 | ||
b3806b43 SR |
3488 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
3489 | NULL, &tracing_pipe_fops); | |
3490 | if (!entry) | |
3491 | pr_warning("Could not create debugfs " | |
98a983aa | 3492 | "'trace_pipe' entry\n"); |
bc0c38d1 | 3493 | |
a94c80e7 | 3494 | entry = debugfs_create_file("buffer_size_kb", 0644, d_tracer, |
a98a3c3f SR |
3495 | &global_trace, &tracing_entries_fops); |
3496 | if (!entry) | |
3497 | pr_warning("Could not create debugfs " | |
a94c80e7 | 3498 | "'buffer_size_kb' entry\n"); |
a98a3c3f | 3499 | |
5bf9a1ee PP |
3500 | entry = debugfs_create_file("trace_marker", 0220, d_tracer, |
3501 | NULL, &tracing_mark_fops); | |
3502 | if (!entry) | |
3503 | pr_warning("Could not create debugfs " | |
3504 | "'trace_marker' entry\n"); | |
3505 | ||
bc0c38d1 SR |
3506 | #ifdef CONFIG_DYNAMIC_FTRACE |
3507 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, | |
3508 | &ftrace_update_tot_cnt, | |
b807c3d0 | 3509 | &tracing_dyn_info_fops); |
bc0c38d1 SR |
3510 | if (!entry) |
3511 | pr_warning("Could not create debugfs " | |
3512 | "'dyn_ftrace_total_info' entry\n"); | |
3513 | #endif | |
d618b3e6 IM |
3514 | #ifdef CONFIG_SYSPROF_TRACER |
3515 | init_tracer_sysprof_debugfs(d_tracer); | |
3516 | #endif | |
b5ad384e | 3517 | return 0; |
bc0c38d1 SR |
3518 | } |
3519 | ||
801fe400 | 3520 | int trace_vprintk(unsigned long ip, const char *fmt, va_list args) |
dd0e545f | 3521 | { |
dd0e545f SR |
3522 | static DEFINE_SPINLOCK(trace_buf_lock); |
3523 | static char trace_buf[TRACE_BUF_SIZE]; | |
f09ce573 | 3524 | |
3928a8a2 | 3525 | struct ring_buffer_event *event; |
f09ce573 | 3526 | struct trace_array *tr = &global_trace; |
dd0e545f | 3527 | struct trace_array_cpu *data; |
777e208d | 3528 | struct print_entry *entry; |
3928a8a2 | 3529 | unsigned long flags, irq_flags; |
38697053 | 3530 | int cpu, len = 0, size, pc; |
dd0e545f | 3531 | |
c76f0694 | 3532 | if (tracing_disabled) |
dd0e545f SR |
3533 | return 0; |
3534 | ||
38697053 SR |
3535 | pc = preempt_count(); |
3536 | preempt_disable_notrace(); | |
dd0e545f SR |
3537 | cpu = raw_smp_processor_id(); |
3538 | data = tr->data[cpu]; | |
dd0e545f | 3539 | |
3ea2e6d7 | 3540 | if (unlikely(atomic_read(&data->disabled))) |
dd0e545f SR |
3541 | goto out; |
3542 | ||
38697053 | 3543 | spin_lock_irqsave(&trace_buf_lock, flags); |
801fe400 | 3544 | len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args); |
dd0e545f SR |
3545 | |
3546 | len = min(len, TRACE_BUF_SIZE-1); | |
3547 | trace_buf[len] = 0; | |
3548 | ||
777e208d SR |
3549 | size = sizeof(*entry) + len + 1; |
3550 | event = ring_buffer_lock_reserve(tr->buffer, size, &irq_flags); | |
3928a8a2 SR |
3551 | if (!event) |
3552 | goto out_unlock; | |
777e208d | 3553 | entry = ring_buffer_event_data(event); |
38697053 | 3554 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
3555 | entry->ent.type = TRACE_PRINT; |
3556 | entry->ip = ip; | |
dd0e545f | 3557 | |
777e208d SR |
3558 | memcpy(&entry->buf, trace_buf, len); |
3559 | entry->buf[len] = 0; | |
3928a8a2 | 3560 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
dd0e545f | 3561 | |
3928a8a2 | 3562 | out_unlock: |
38697053 | 3563 | spin_unlock_irqrestore(&trace_buf_lock, flags); |
dd0e545f SR |
3564 | |
3565 | out: | |
38697053 | 3566 | preempt_enable_notrace(); |
dd0e545f SR |
3567 | |
3568 | return len; | |
3569 | } | |
801fe400 PP |
3570 | EXPORT_SYMBOL_GPL(trace_vprintk); |
3571 | ||
3572 | int __ftrace_printk(unsigned long ip, const char *fmt, ...) | |
3573 | { | |
3574 | int ret; | |
3575 | va_list ap; | |
3576 | ||
3577 | if (!(trace_flags & TRACE_ITER_PRINTK)) | |
3578 | return 0; | |
3579 | ||
3580 | va_start(ap, fmt); | |
3581 | ret = trace_vprintk(ip, fmt, ap); | |
3582 | va_end(ap); | |
3583 | return ret; | |
3584 | } | |
dd0e545f SR |
3585 | EXPORT_SYMBOL_GPL(__ftrace_printk); |
3586 | ||
3f5a54e3 SR |
3587 | static int trace_panic_handler(struct notifier_block *this, |
3588 | unsigned long event, void *unused) | |
3589 | { | |
944ac425 SR |
3590 | if (ftrace_dump_on_oops) |
3591 | ftrace_dump(); | |
3f5a54e3 SR |
3592 | return NOTIFY_OK; |
3593 | } | |
3594 | ||
3595 | static struct notifier_block trace_panic_notifier = { | |
3596 | .notifier_call = trace_panic_handler, | |
3597 | .next = NULL, | |
3598 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ | |
3599 | }; | |
3600 | ||
3601 | static int trace_die_handler(struct notifier_block *self, | |
3602 | unsigned long val, | |
3603 | void *data) | |
3604 | { | |
3605 | switch (val) { | |
3606 | case DIE_OOPS: | |
944ac425 SR |
3607 | if (ftrace_dump_on_oops) |
3608 | ftrace_dump(); | |
3f5a54e3 SR |
3609 | break; |
3610 | default: | |
3611 | break; | |
3612 | } | |
3613 | return NOTIFY_OK; | |
3614 | } | |
3615 | ||
3616 | static struct notifier_block trace_die_notifier = { | |
3617 | .notifier_call = trace_die_handler, | |
3618 | .priority = 200 | |
3619 | }; | |
3620 | ||
3621 | /* | |
3622 | * printk is set to max of 1024, we really don't need it that big. | |
3623 | * Nothing should be printing 1000 characters anyway. | |
3624 | */ | |
3625 | #define TRACE_MAX_PRINT 1000 | |
3626 | ||
3627 | /* | |
3628 | * Define here KERN_TRACE so that we have one place to modify | |
3629 | * it if we decide to change what log level the ftrace dump | |
3630 | * should be at. | |
3631 | */ | |
3632 | #define KERN_TRACE KERN_INFO | |
3633 | ||
3634 | static void | |
3635 | trace_printk_seq(struct trace_seq *s) | |
3636 | { | |
3637 | /* Probably should print a warning here. */ | |
3638 | if (s->len >= 1000) | |
3639 | s->len = 1000; | |
3640 | ||
3641 | /* should be zero ended, but we are paranoid. */ | |
3642 | s->buffer[s->len] = 0; | |
3643 | ||
3644 | printk(KERN_TRACE "%s", s->buffer); | |
3645 | ||
3646 | trace_seq_reset(s); | |
3647 | } | |
3648 | ||
3f5a54e3 SR |
3649 | void ftrace_dump(void) |
3650 | { | |
3651 | static DEFINE_SPINLOCK(ftrace_dump_lock); | |
3652 | /* use static because iter can be a bit big for the stack */ | |
3653 | static struct trace_iterator iter; | |
3f5a54e3 SR |
3654 | static cpumask_t mask; |
3655 | static int dump_ran; | |
d769041f SR |
3656 | unsigned long flags; |
3657 | int cnt = 0, cpu; | |
3f5a54e3 SR |
3658 | |
3659 | /* only one dump */ | |
3660 | spin_lock_irqsave(&ftrace_dump_lock, flags); | |
3661 | if (dump_ran) | |
3662 | goto out; | |
3663 | ||
3664 | dump_ran = 1; | |
3665 | ||
3666 | /* No turning back! */ | |
81adbdc0 | 3667 | ftrace_kill(); |
3f5a54e3 | 3668 | |
d769041f SR |
3669 | for_each_tracing_cpu(cpu) { |
3670 | atomic_inc(&global_trace.data[cpu]->disabled); | |
3671 | } | |
3672 | ||
b54d3de9 TE |
3673 | /* don't look at user memory in panic mode */ |
3674 | trace_flags &= ~TRACE_ITER_SYM_USEROBJ; | |
3675 | ||
3f5a54e3 SR |
3676 | printk(KERN_TRACE "Dumping ftrace buffer:\n"); |
3677 | ||
3678 | iter.tr = &global_trace; | |
3679 | iter.trace = current_trace; | |
3680 | ||
3681 | /* | |
3682 | * We need to stop all tracing on all CPUS to read the | |
3683 | * the next buffer. This is a bit expensive, but is | |
3684 | * not done often. We fill all what we can read, | |
3685 | * and then release the locks again. | |
3686 | */ | |
3687 | ||
3688 | cpus_clear(mask); | |
3689 | ||
3f5a54e3 SR |
3690 | while (!trace_empty(&iter)) { |
3691 | ||
3692 | if (!cnt) | |
3693 | printk(KERN_TRACE "---------------------------------\n"); | |
3694 | ||
3695 | cnt++; | |
3696 | ||
3697 | /* reset all but tr, trace, and overruns */ | |
3698 | memset(&iter.seq, 0, | |
3699 | sizeof(struct trace_iterator) - | |
3700 | offsetof(struct trace_iterator, seq)); | |
3701 | iter.iter_flags |= TRACE_FILE_LAT_FMT; | |
3702 | iter.pos = -1; | |
3703 | ||
3704 | if (find_next_entry_inc(&iter) != NULL) { | |
3705 | print_trace_line(&iter); | |
3706 | trace_consume(&iter); | |
3707 | } | |
3708 | ||
3709 | trace_printk_seq(&iter.seq); | |
3710 | } | |
3711 | ||
3712 | if (!cnt) | |
3713 | printk(KERN_TRACE " (ftrace buffer empty)\n"); | |
3714 | else | |
3715 | printk(KERN_TRACE "---------------------------------\n"); | |
3716 | ||
3f5a54e3 SR |
3717 | out: |
3718 | spin_unlock_irqrestore(&ftrace_dump_lock, flags); | |
3719 | } | |
3720 | ||
3928a8a2 | 3721 | __init static int tracer_alloc_buffers(void) |
bc0c38d1 | 3722 | { |
4c11d7ae | 3723 | struct trace_array_cpu *data; |
4c11d7ae SR |
3724 | int i; |
3725 | ||
3928a8a2 SR |
3726 | /* TODO: make the number of buffers hot pluggable with CPUS */ |
3727 | tracing_buffer_mask = cpu_possible_map; | |
4c11d7ae | 3728 | |
3928a8a2 SR |
3729 | global_trace.buffer = ring_buffer_alloc(trace_buf_size, |
3730 | TRACE_BUFFER_FLAGS); | |
3731 | if (!global_trace.buffer) { | |
3732 | printk(KERN_ERR "tracer: failed to allocate ring buffer!\n"); | |
3733 | WARN_ON(1); | |
3734 | return 0; | |
4c11d7ae | 3735 | } |
3928a8a2 | 3736 | global_trace.entries = ring_buffer_size(global_trace.buffer); |
4c11d7ae SR |
3737 | |
3738 | #ifdef CONFIG_TRACER_MAX_TRACE | |
3928a8a2 SR |
3739 | max_tr.buffer = ring_buffer_alloc(trace_buf_size, |
3740 | TRACE_BUFFER_FLAGS); | |
3741 | if (!max_tr.buffer) { | |
3742 | printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n"); | |
3743 | WARN_ON(1); | |
3744 | ring_buffer_free(global_trace.buffer); | |
3745 | return 0; | |
4c11d7ae | 3746 | } |
3928a8a2 SR |
3747 | max_tr.entries = ring_buffer_size(max_tr.buffer); |
3748 | WARN_ON(max_tr.entries != global_trace.entries); | |
a98a3c3f | 3749 | #endif |
ab46428c | 3750 | |
4c11d7ae | 3751 | /* Allocate the first page for all buffers */ |
ab46428c | 3752 | for_each_tracing_cpu(i) { |
4c11d7ae | 3753 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
bc0c38d1 | 3754 | max_tr.data[i] = &per_cpu(max_data, i); |
4c11d7ae | 3755 | } |
bc0c38d1 | 3756 | |
bc0c38d1 SR |
3757 | trace_init_cmdlines(); |
3758 | ||
43a15386 | 3759 | register_tracer(&nop_trace); |
b5ad384e FW |
3760 | #ifdef CONFIG_BOOT_TRACER |
3761 | register_tracer(&boot_tracer); | |
3762 | current_trace = &boot_tracer; | |
3763 | current_trace->init(&global_trace); | |
3764 | #else | |
43a15386 | 3765 | current_trace = &nop_trace; |
b5ad384e | 3766 | #endif |
bc0c38d1 | 3767 | |
60a11774 SR |
3768 | /* All seems OK, enable tracing */ |
3769 | tracing_disabled = 0; | |
3928a8a2 | 3770 | |
3f5a54e3 SR |
3771 | atomic_notifier_chain_register(&panic_notifier_list, |
3772 | &trace_panic_notifier); | |
3773 | ||
3774 | register_die_notifier(&trace_die_notifier); | |
3775 | ||
bc0c38d1 | 3776 | return 0; |
bc0c38d1 | 3777 | } |
b5ad384e FW |
3778 | early_initcall(tracer_alloc_buffers); |
3779 | fs_initcall(tracer_init_debugfs); |