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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 | ||
8e1b82e0 FW |
47 | /* |
48 | * We need to change this state when a selftest is running. | |
ff32504f FW |
49 | * A selftest will lurk into the ring-buffer to count the |
50 | * entries inserted during the selftest although some concurrent | |
51 | * insertions into the ring-buffer such as ftrace_printk could occurred | |
52 | * at the same time, giving false positive or negative results. | |
53 | */ | |
8e1b82e0 | 54 | static bool __read_mostly tracing_selftest_running; |
ff32504f | 55 | |
adf9f195 FW |
56 | /* For tracers that don't implement custom flags */ |
57 | static struct tracer_opt dummy_tracer_opt[] = { | |
58 | { } | |
59 | }; | |
60 | ||
61 | static struct tracer_flags dummy_tracer_flags = { | |
62 | .val = 0, | |
63 | .opts = dummy_tracer_opt | |
64 | }; | |
65 | ||
66 | static int dummy_set_flag(u32 old_flags, u32 bit, int set) | |
67 | { | |
68 | return 0; | |
69 | } | |
0f048701 SR |
70 | |
71 | /* | |
72 | * Kill all tracing for good (never come back). | |
73 | * It is initialized to 1 but will turn to zero if the initialization | |
74 | * of the tracer is successful. But that is the only place that sets | |
75 | * this back to zero. | |
76 | */ | |
77 | int tracing_disabled = 1; | |
78 | ||
d769041f SR |
79 | static DEFINE_PER_CPU(local_t, ftrace_cpu_disabled); |
80 | ||
81 | static inline void ftrace_disable_cpu(void) | |
82 | { | |
83 | preempt_disable(); | |
84 | local_inc(&__get_cpu_var(ftrace_cpu_disabled)); | |
85 | } | |
86 | ||
87 | static inline void ftrace_enable_cpu(void) | |
88 | { | |
89 | local_dec(&__get_cpu_var(ftrace_cpu_disabled)); | |
90 | preempt_enable(); | |
91 | } | |
92 | ||
ab46428c SR |
93 | static cpumask_t __read_mostly tracing_buffer_mask; |
94 | ||
95 | #define for_each_tracing_cpu(cpu) \ | |
96 | for_each_cpu_mask(cpu, tracing_buffer_mask) | |
97 | ||
944ac425 SR |
98 | /* |
99 | * ftrace_dump_on_oops - variable to dump ftrace buffer on oops | |
100 | * | |
101 | * If there is an oops (or kernel panic) and the ftrace_dump_on_oops | |
102 | * is set, then ftrace_dump is called. This will output the contents | |
103 | * of the ftrace buffers to the console. This is very useful for | |
104 | * capturing traces that lead to crashes and outputing it to a | |
105 | * serial console. | |
106 | * | |
107 | * It is default off, but you can enable it with either specifying | |
108 | * "ftrace_dump_on_oops" in the kernel command line, or setting | |
109 | * /proc/sys/kernel/ftrace_dump_on_oops to true. | |
110 | */ | |
111 | int ftrace_dump_on_oops; | |
112 | ||
d9e54076 PZ |
113 | static int tracing_set_tracer(char *buf); |
114 | ||
115 | static int __init set_ftrace(char *str) | |
116 | { | |
117 | tracing_set_tracer(str); | |
118 | return 1; | |
119 | } | |
120 | __setup("ftrace", set_ftrace); | |
121 | ||
944ac425 SR |
122 | static int __init set_ftrace_dump_on_oops(char *str) |
123 | { | |
124 | ftrace_dump_on_oops = 1; | |
125 | return 1; | |
126 | } | |
127 | __setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops); | |
128 | ||
72829bc3 | 129 | long |
bc0c38d1 SR |
130 | ns2usecs(cycle_t nsec) |
131 | { | |
132 | nsec += 500; | |
133 | do_div(nsec, 1000); | |
134 | return nsec; | |
135 | } | |
136 | ||
e309b41d | 137 | cycle_t ftrace_now(int cpu) |
750ed1a4 | 138 | { |
3928a8a2 SR |
139 | u64 ts = ring_buffer_time_stamp(cpu); |
140 | ring_buffer_normalize_time_stamp(cpu, &ts); | |
141 | return ts; | |
750ed1a4 IM |
142 | } |
143 | ||
4fcdae83 SR |
144 | /* |
145 | * The global_trace is the descriptor that holds the tracing | |
146 | * buffers for the live tracing. For each CPU, it contains | |
147 | * a link list of pages that will store trace entries. The | |
148 | * page descriptor of the pages in the memory is used to hold | |
149 | * the link list by linking the lru item in the page descriptor | |
150 | * to each of the pages in the buffer per CPU. | |
151 | * | |
152 | * For each active CPU there is a data field that holds the | |
153 | * pages for the buffer for that CPU. Each CPU has the same number | |
154 | * of pages allocated for its buffer. | |
155 | */ | |
bc0c38d1 SR |
156 | static struct trace_array global_trace; |
157 | ||
158 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); | |
159 | ||
4fcdae83 SR |
160 | /* |
161 | * The max_tr is used to snapshot the global_trace when a maximum | |
162 | * latency is reached. Some tracers will use this to store a maximum | |
163 | * trace while it continues examining live traces. | |
164 | * | |
165 | * The buffers for the max_tr are set up the same as the global_trace. | |
166 | * When a snapshot is taken, the link list of the max_tr is swapped | |
167 | * with the link list of the global_trace and the buffers are reset for | |
168 | * the global_trace so the tracing can continue. | |
169 | */ | |
bc0c38d1 SR |
170 | static struct trace_array max_tr; |
171 | ||
172 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); | |
173 | ||
4fcdae83 | 174 | /* tracer_enabled is used to toggle activation of a tracer */ |
26994ead | 175 | static int tracer_enabled = 1; |
4fcdae83 | 176 | |
9036990d SR |
177 | /** |
178 | * tracing_is_enabled - return tracer_enabled status | |
179 | * | |
180 | * This function is used by other tracers to know the status | |
181 | * of the tracer_enabled flag. Tracers may use this function | |
182 | * to know if it should enable their features when starting | |
183 | * up. See irqsoff tracer for an example (start_irqsoff_tracer). | |
184 | */ | |
185 | int tracing_is_enabled(void) | |
186 | { | |
187 | return tracer_enabled; | |
188 | } | |
189 | ||
60bc0800 SR |
190 | /* function tracing enabled */ |
191 | int ftrace_function_enabled; | |
192 | ||
4fcdae83 | 193 | /* |
3928a8a2 SR |
194 | * trace_buf_size is the size in bytes that is allocated |
195 | * for a buffer. Note, the number of bytes is always rounded | |
196 | * to page size. | |
3f5a54e3 SR |
197 | * |
198 | * This number is purposely set to a low number of 16384. | |
199 | * If the dump on oops happens, it will be much appreciated | |
200 | * to not have to wait for all that output. Anyway this can be | |
201 | * boot time and run time configurable. | |
4fcdae83 | 202 | */ |
3928a8a2 | 203 | #define TRACE_BUF_SIZE_DEFAULT 1441792UL /* 16384 * 88 (sizeof(entry)) */ |
3f5a54e3 | 204 | |
3928a8a2 | 205 | static unsigned long trace_buf_size = TRACE_BUF_SIZE_DEFAULT; |
bc0c38d1 | 206 | |
4fcdae83 | 207 | /* trace_types holds a link list of available tracers. */ |
bc0c38d1 | 208 | static struct tracer *trace_types __read_mostly; |
4fcdae83 SR |
209 | |
210 | /* current_trace points to the tracer that is currently active */ | |
bc0c38d1 | 211 | static struct tracer *current_trace __read_mostly; |
4fcdae83 SR |
212 | |
213 | /* | |
214 | * max_tracer_type_len is used to simplify the allocating of | |
215 | * buffers to read userspace tracer names. We keep track of | |
216 | * the longest tracer name registered. | |
217 | */ | |
bc0c38d1 SR |
218 | static int max_tracer_type_len; |
219 | ||
4fcdae83 SR |
220 | /* |
221 | * trace_types_lock is used to protect the trace_types list. | |
222 | * This lock is also used to keep user access serialized. | |
223 | * Accesses from userspace will grab this lock while userspace | |
224 | * activities happen inside the kernel. | |
225 | */ | |
bc0c38d1 | 226 | static DEFINE_MUTEX(trace_types_lock); |
4fcdae83 SR |
227 | |
228 | /* trace_wait is a waitqueue for tasks blocked on trace_poll */ | |
4e655519 IM |
229 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
230 | ||
ee6bce52 | 231 | /* trace_flags holds trace_options default values */ |
12ef7d44 SR |
232 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK | |
233 | TRACE_ITER_ANNOTATE; | |
4e655519 | 234 | |
4fcdae83 SR |
235 | /** |
236 | * trace_wake_up - wake up tasks waiting for trace input | |
237 | * | |
238 | * Simply wakes up any task that is blocked on the trace_wait | |
239 | * queue. These is used with trace_poll for tasks polling the trace. | |
240 | */ | |
4e655519 IM |
241 | void trace_wake_up(void) |
242 | { | |
017730c1 IM |
243 | /* |
244 | * The runqueue_is_locked() can fail, but this is the best we | |
245 | * have for now: | |
246 | */ | |
247 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) | |
4e655519 IM |
248 | wake_up(&trace_wait); |
249 | } | |
bc0c38d1 | 250 | |
3928a8a2 | 251 | static int __init set_buf_size(char *str) |
bc0c38d1 | 252 | { |
3928a8a2 | 253 | unsigned long buf_size; |
c6caeeb1 SR |
254 | int ret; |
255 | ||
bc0c38d1 SR |
256 | if (!str) |
257 | return 0; | |
3928a8a2 | 258 | ret = strict_strtoul(str, 0, &buf_size); |
c6caeeb1 | 259 | /* nr_entries can not be zero */ |
3928a8a2 | 260 | if (ret < 0 || buf_size == 0) |
c6caeeb1 | 261 | return 0; |
3928a8a2 | 262 | trace_buf_size = buf_size; |
bc0c38d1 SR |
263 | return 1; |
264 | } | |
3928a8a2 | 265 | __setup("trace_buf_size=", set_buf_size); |
bc0c38d1 | 266 | |
57f50be1 SR |
267 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
268 | { | |
269 | return nsecs / 1000; | |
270 | } | |
271 | ||
4fcdae83 | 272 | /* These must match the bit postions in trace_iterator_flags */ |
bc0c38d1 SR |
273 | static const char *trace_options[] = { |
274 | "print-parent", | |
275 | "sym-offset", | |
276 | "sym-addr", | |
277 | "verbose", | |
f9896bf3 | 278 | "raw", |
5e3ca0ec | 279 | "hex", |
cb0f12aa | 280 | "bin", |
2a2cc8f7 | 281 | "block", |
86387f7e | 282 | "stacktrace", |
4ac3ba41 | 283 | "sched-tree", |
f09ce573 | 284 | "ftrace_printk", |
b2a866f9 | 285 | "ftrace_preempt", |
9f029e83 | 286 | "branch", |
12ef7d44 | 287 | "annotate", |
02b67518 | 288 | "userstacktrace", |
b54d3de9 | 289 | "sym-userobj", |
66896a85 | 290 | "printk-msg-only", |
bc0c38d1 SR |
291 | NULL |
292 | }; | |
293 | ||
4fcdae83 SR |
294 | /* |
295 | * ftrace_max_lock is used to protect the swapping of buffers | |
296 | * when taking a max snapshot. The buffers themselves are | |
297 | * protected by per_cpu spinlocks. But the action of the swap | |
298 | * needs its own lock. | |
299 | * | |
300 | * This is defined as a raw_spinlock_t in order to help | |
301 | * with performance when lockdep debugging is enabled. | |
302 | */ | |
92205c23 SR |
303 | static raw_spinlock_t ftrace_max_lock = |
304 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; | |
bc0c38d1 SR |
305 | |
306 | /* | |
307 | * Copy the new maximum trace into the separate maximum-trace | |
308 | * structure. (this way the maximum trace is permanently saved, | |
309 | * for later retrieval via /debugfs/tracing/latency_trace) | |
310 | */ | |
e309b41d | 311 | static void |
bc0c38d1 SR |
312 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
313 | { | |
314 | struct trace_array_cpu *data = tr->data[cpu]; | |
315 | ||
316 | max_tr.cpu = cpu; | |
317 | max_tr.time_start = data->preempt_timestamp; | |
318 | ||
319 | data = max_tr.data[cpu]; | |
320 | data->saved_latency = tracing_max_latency; | |
321 | ||
322 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); | |
323 | data->pid = tsk->pid; | |
324 | data->uid = tsk->uid; | |
325 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; | |
326 | data->policy = tsk->policy; | |
327 | data->rt_priority = tsk->rt_priority; | |
328 | ||
329 | /* record this tasks comm */ | |
330 | tracing_record_cmdline(current); | |
331 | } | |
332 | ||
4fcdae83 SR |
333 | /** |
334 | * trace_seq_printf - sequence printing of trace information | |
335 | * @s: trace sequence descriptor | |
336 | * @fmt: printf format string | |
337 | * | |
338 | * The tracer may use either sequence operations or its own | |
339 | * copy to user routines. To simplify formating of a trace | |
340 | * trace_seq_printf is used to store strings into a special | |
341 | * buffer (@s). Then the output may be either used by | |
342 | * the sequencer or pulled into another buffer. | |
343 | */ | |
72829bc3 | 344 | int |
214023c3 SR |
345 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
346 | { | |
347 | int len = (PAGE_SIZE - 1) - s->len; | |
348 | va_list ap; | |
b3806b43 | 349 | int ret; |
214023c3 SR |
350 | |
351 | if (!len) | |
352 | return 0; | |
353 | ||
354 | va_start(ap, fmt); | |
b3806b43 | 355 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
214023c3 SR |
356 | va_end(ap); |
357 | ||
b3806b43 | 358 | /* If we can't write it all, don't bother writing anything */ |
72829bc3 | 359 | if (ret >= len) |
b3806b43 SR |
360 | return 0; |
361 | ||
362 | s->len += ret; | |
214023c3 SR |
363 | |
364 | return len; | |
365 | } | |
366 | ||
4fcdae83 SR |
367 | /** |
368 | * trace_seq_puts - trace sequence printing of simple string | |
369 | * @s: trace sequence descriptor | |
370 | * @str: simple string to record | |
371 | * | |
372 | * The tracer may use either the sequence operations or its own | |
373 | * copy to user routines. This function records a simple string | |
374 | * into a special buffer (@s) for later retrieval by a sequencer | |
375 | * or other mechanism. | |
376 | */ | |
e309b41d | 377 | static int |
214023c3 SR |
378 | trace_seq_puts(struct trace_seq *s, const char *str) |
379 | { | |
380 | int len = strlen(str); | |
381 | ||
382 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
b3806b43 | 383 | return 0; |
214023c3 SR |
384 | |
385 | memcpy(s->buffer + s->len, str, len); | |
386 | s->len += len; | |
387 | ||
388 | return len; | |
389 | } | |
390 | ||
e309b41d | 391 | static int |
214023c3 SR |
392 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
393 | { | |
394 | if (s->len >= (PAGE_SIZE - 1)) | |
395 | return 0; | |
396 | ||
397 | s->buffer[s->len++] = c; | |
398 | ||
399 | return 1; | |
400 | } | |
401 | ||
e309b41d | 402 | static int |
cb0f12aa IM |
403 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
404 | { | |
405 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
406 | return 0; | |
407 | ||
408 | memcpy(s->buffer + s->len, mem, len); | |
409 | s->len += len; | |
410 | ||
411 | return len; | |
412 | } | |
413 | ||
ad0a3b68 HH |
414 | #define MAX_MEMHEX_BYTES 8 |
415 | #define HEX_CHARS (MAX_MEMHEX_BYTES*2 + 1) | |
5e3ca0ec | 416 | |
e309b41d | 417 | static int |
5e3ca0ec IM |
418 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
419 | { | |
420 | unsigned char hex[HEX_CHARS]; | |
93dcc6ea | 421 | unsigned char *data = mem; |
5e3ca0ec IM |
422 | int i, j; |
423 | ||
5e3ca0ec IM |
424 | #ifdef __BIG_ENDIAN |
425 | for (i = 0, j = 0; i < len; i++) { | |
426 | #else | |
427 | for (i = len-1, j = 0; i >= 0; i--) { | |
428 | #endif | |
2fbc4749 HH |
429 | hex[j++] = hex_asc_hi(data[i]); |
430 | hex[j++] = hex_asc_lo(data[i]); | |
5e3ca0ec | 431 | } |
93dcc6ea | 432 | hex[j++] = ' '; |
5e3ca0ec IM |
433 | |
434 | return trace_seq_putmem(s, hex, j); | |
435 | } | |
436 | ||
b54d3de9 TE |
437 | static int |
438 | trace_seq_path(struct trace_seq *s, struct path *path) | |
439 | { | |
440 | unsigned char *p; | |
441 | ||
442 | if (s->len >= (PAGE_SIZE - 1)) | |
443 | return 0; | |
444 | p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len); | |
445 | if (!IS_ERR(p)) { | |
446 | p = mangle_path(s->buffer + s->len, p, "\n"); | |
447 | if (p) { | |
448 | s->len = p - s->buffer; | |
449 | return 1; | |
450 | } | |
451 | } else { | |
452 | s->buffer[s->len++] = '?'; | |
453 | return 1; | |
454 | } | |
455 | ||
456 | return 0; | |
457 | } | |
458 | ||
e309b41d | 459 | static void |
214023c3 SR |
460 | trace_seq_reset(struct trace_seq *s) |
461 | { | |
462 | s->len = 0; | |
6c6c2796 PP |
463 | s->readpos = 0; |
464 | } | |
465 | ||
466 | ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) | |
467 | { | |
468 | int len; | |
469 | int ret; | |
470 | ||
471 | if (s->len <= s->readpos) | |
472 | return -EBUSY; | |
473 | ||
474 | len = s->len - s->readpos; | |
475 | if (cnt > len) | |
476 | cnt = len; | |
477 | ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); | |
478 | if (ret) | |
479 | return -EFAULT; | |
480 | ||
481 | s->readpos += len; | |
482 | return cnt; | |
214023c3 SR |
483 | } |
484 | ||
e309b41d | 485 | static void |
214023c3 SR |
486 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
487 | { | |
488 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; | |
489 | ||
490 | s->buffer[len] = 0; | |
491 | seq_puts(m, s->buffer); | |
492 | ||
493 | trace_seq_reset(s); | |
494 | } | |
495 | ||
4fcdae83 SR |
496 | /** |
497 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr | |
498 | * @tr: tracer | |
499 | * @tsk: the task with the latency | |
500 | * @cpu: The cpu that initiated the trace. | |
501 | * | |
502 | * Flip the buffers between the @tr and the max_tr and record information | |
503 | * about which task was the cause of this latency. | |
504 | */ | |
e309b41d | 505 | void |
bc0c38d1 SR |
506 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
507 | { | |
3928a8a2 | 508 | struct ring_buffer *buf = tr->buffer; |
bc0c38d1 | 509 | |
4c11d7ae | 510 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 511 | __raw_spin_lock(&ftrace_max_lock); |
3928a8a2 SR |
512 | |
513 | tr->buffer = max_tr.buffer; | |
514 | max_tr.buffer = buf; | |
515 | ||
d769041f | 516 | ftrace_disable_cpu(); |
3928a8a2 | 517 | ring_buffer_reset(tr->buffer); |
d769041f | 518 | ftrace_enable_cpu(); |
bc0c38d1 SR |
519 | |
520 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 521 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
522 | } |
523 | ||
524 | /** | |
525 | * update_max_tr_single - only copy one trace over, and reset the rest | |
526 | * @tr - tracer | |
527 | * @tsk - task with the latency | |
528 | * @cpu - the cpu of the buffer to copy. | |
4fcdae83 SR |
529 | * |
530 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. | |
bc0c38d1 | 531 | */ |
e309b41d | 532 | void |
bc0c38d1 SR |
533 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
534 | { | |
3928a8a2 | 535 | int ret; |
bc0c38d1 | 536 | |
4c11d7ae | 537 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 538 | __raw_spin_lock(&ftrace_max_lock); |
bc0c38d1 | 539 | |
d769041f SR |
540 | ftrace_disable_cpu(); |
541 | ||
3928a8a2 SR |
542 | ring_buffer_reset(max_tr.buffer); |
543 | ret = ring_buffer_swap_cpu(max_tr.buffer, tr->buffer, cpu); | |
544 | ||
d769041f SR |
545 | ftrace_enable_cpu(); |
546 | ||
3928a8a2 | 547 | WARN_ON_ONCE(ret); |
bc0c38d1 SR |
548 | |
549 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 550 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
551 | } |
552 | ||
4fcdae83 SR |
553 | /** |
554 | * register_tracer - register a tracer with the ftrace system. | |
555 | * @type - the plugin for the tracer | |
556 | * | |
557 | * Register a new plugin tracer. | |
558 | */ | |
bc0c38d1 SR |
559 | int register_tracer(struct tracer *type) |
560 | { | |
561 | struct tracer *t; | |
562 | int len; | |
563 | int ret = 0; | |
564 | ||
565 | if (!type->name) { | |
566 | pr_info("Tracer must have a name\n"); | |
567 | return -1; | |
568 | } | |
569 | ||
86fa2f60 IM |
570 | /* |
571 | * When this gets called we hold the BKL which means that | |
572 | * preemption is disabled. Various trace selftests however | |
573 | * need to disable and enable preemption for successful tests. | |
574 | * So we drop the BKL here and grab it after the tests again. | |
575 | */ | |
576 | unlock_kernel(); | |
bc0c38d1 | 577 | mutex_lock(&trace_types_lock); |
86fa2f60 | 578 | |
8e1b82e0 FW |
579 | tracing_selftest_running = true; |
580 | ||
bc0c38d1 SR |
581 | for (t = trace_types; t; t = t->next) { |
582 | if (strcmp(type->name, t->name) == 0) { | |
583 | /* already found */ | |
584 | pr_info("Trace %s already registered\n", | |
585 | type->name); | |
586 | ret = -1; | |
587 | goto out; | |
588 | } | |
589 | } | |
590 | ||
adf9f195 FW |
591 | if (!type->set_flag) |
592 | type->set_flag = &dummy_set_flag; | |
593 | if (!type->flags) | |
594 | type->flags = &dummy_tracer_flags; | |
595 | else | |
596 | if (!type->flags->opts) | |
597 | type->flags->opts = dummy_tracer_opt; | |
598 | ||
60a11774 SR |
599 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
600 | if (type->selftest) { | |
601 | struct tracer *saved_tracer = current_trace; | |
60a11774 | 602 | struct trace_array *tr = &global_trace; |
60a11774 | 603 | int i; |
ff32504f | 604 | |
60a11774 SR |
605 | /* |
606 | * Run a selftest on this tracer. | |
607 | * Here we reset the trace buffer, and set the current | |
608 | * tracer to be this tracer. The tracer can then run some | |
609 | * internal tracing to verify that everything is in order. | |
610 | * If we fail, we do not register this tracer. | |
611 | */ | |
86fa2f60 | 612 | for_each_tracing_cpu(i) |
3928a8a2 | 613 | tracing_reset(tr, i); |
86fa2f60 | 614 | |
60a11774 | 615 | current_trace = type; |
60a11774 SR |
616 | /* the test is responsible for initializing and enabling */ |
617 | pr_info("Testing tracer %s: ", type->name); | |
618 | ret = type->selftest(type, tr); | |
619 | /* the test is responsible for resetting too */ | |
620 | current_trace = saved_tracer; | |
60a11774 SR |
621 | if (ret) { |
622 | printk(KERN_CONT "FAILED!\n"); | |
623 | goto out; | |
624 | } | |
1d4db00a | 625 | /* Only reset on passing, to avoid touching corrupted buffers */ |
86fa2f60 | 626 | for_each_tracing_cpu(i) |
3928a8a2 | 627 | tracing_reset(tr, i); |
86fa2f60 | 628 | |
60a11774 SR |
629 | printk(KERN_CONT "PASSED\n"); |
630 | } | |
631 | #endif | |
632 | ||
bc0c38d1 SR |
633 | type->next = trace_types; |
634 | trace_types = type; | |
635 | len = strlen(type->name); | |
636 | if (len > max_tracer_type_len) | |
637 | max_tracer_type_len = len; | |
60a11774 | 638 | |
bc0c38d1 | 639 | out: |
8e1b82e0 | 640 | tracing_selftest_running = false; |
bc0c38d1 | 641 | mutex_unlock(&trace_types_lock); |
86fa2f60 | 642 | lock_kernel(); |
bc0c38d1 SR |
643 | |
644 | return ret; | |
645 | } | |
646 | ||
647 | void unregister_tracer(struct tracer *type) | |
648 | { | |
649 | struct tracer **t; | |
650 | int len; | |
651 | ||
652 | mutex_lock(&trace_types_lock); | |
653 | for (t = &trace_types; *t; t = &(*t)->next) { | |
654 | if (*t == type) | |
655 | goto found; | |
656 | } | |
657 | pr_info("Trace %s not registered\n", type->name); | |
658 | goto out; | |
659 | ||
660 | found: | |
661 | *t = (*t)->next; | |
662 | if (strlen(type->name) != max_tracer_type_len) | |
663 | goto out; | |
664 | ||
665 | max_tracer_type_len = 0; | |
666 | for (t = &trace_types; *t; t = &(*t)->next) { | |
667 | len = strlen((*t)->name); | |
668 | if (len > max_tracer_type_len) | |
669 | max_tracer_type_len = len; | |
670 | } | |
671 | out: | |
672 | mutex_unlock(&trace_types_lock); | |
673 | } | |
674 | ||
3928a8a2 | 675 | void tracing_reset(struct trace_array *tr, int cpu) |
bc0c38d1 | 676 | { |
d769041f | 677 | ftrace_disable_cpu(); |
3928a8a2 | 678 | ring_buffer_reset_cpu(tr->buffer, cpu); |
d769041f | 679 | ftrace_enable_cpu(); |
bc0c38d1 SR |
680 | } |
681 | ||
bc0c38d1 SR |
682 | #define SAVED_CMDLINES 128 |
683 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; | |
684 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; | |
685 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; | |
686 | static int cmdline_idx; | |
687 | static DEFINE_SPINLOCK(trace_cmdline_lock); | |
25b0b44a | 688 | |
25b0b44a SR |
689 | /* temporary disable recording */ |
690 | atomic_t trace_record_cmdline_disabled __read_mostly; | |
bc0c38d1 SR |
691 | |
692 | static void trace_init_cmdlines(void) | |
693 | { | |
694 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); | |
695 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); | |
696 | cmdline_idx = 0; | |
697 | } | |
698 | ||
0f048701 SR |
699 | static int trace_stop_count; |
700 | static DEFINE_SPINLOCK(tracing_start_lock); | |
701 | ||
69bb54ec SR |
702 | /** |
703 | * ftrace_off_permanent - disable all ftrace code permanently | |
704 | * | |
705 | * This should only be called when a serious anomally has | |
706 | * been detected. This will turn off the function tracing, | |
707 | * ring buffers, and other tracing utilites. It takes no | |
708 | * locks and can be called from any context. | |
709 | */ | |
710 | void ftrace_off_permanent(void) | |
711 | { | |
712 | tracing_disabled = 1; | |
713 | ftrace_stop(); | |
714 | tracing_off_permanent(); | |
715 | } | |
716 | ||
0f048701 SR |
717 | /** |
718 | * tracing_start - quick start of the tracer | |
719 | * | |
720 | * If tracing is enabled but was stopped by tracing_stop, | |
721 | * this will start the tracer back up. | |
722 | */ | |
723 | void tracing_start(void) | |
724 | { | |
725 | struct ring_buffer *buffer; | |
726 | unsigned long flags; | |
727 | ||
728 | if (tracing_disabled) | |
729 | return; | |
730 | ||
731 | spin_lock_irqsave(&tracing_start_lock, flags); | |
732 | if (--trace_stop_count) | |
733 | goto out; | |
734 | ||
735 | if (trace_stop_count < 0) { | |
736 | /* Someone screwed up their debugging */ | |
737 | WARN_ON_ONCE(1); | |
738 | trace_stop_count = 0; | |
739 | goto out; | |
740 | } | |
741 | ||
742 | ||
743 | buffer = global_trace.buffer; | |
744 | if (buffer) | |
745 | ring_buffer_record_enable(buffer); | |
746 | ||
747 | buffer = max_tr.buffer; | |
748 | if (buffer) | |
749 | ring_buffer_record_enable(buffer); | |
750 | ||
751 | ftrace_start(); | |
752 | out: | |
753 | spin_unlock_irqrestore(&tracing_start_lock, flags); | |
754 | } | |
755 | ||
756 | /** | |
757 | * tracing_stop - quick stop of the tracer | |
758 | * | |
759 | * Light weight way to stop tracing. Use in conjunction with | |
760 | * tracing_start. | |
761 | */ | |
762 | void tracing_stop(void) | |
763 | { | |
764 | struct ring_buffer *buffer; | |
765 | unsigned long flags; | |
766 | ||
767 | ftrace_stop(); | |
768 | spin_lock_irqsave(&tracing_start_lock, flags); | |
769 | if (trace_stop_count++) | |
770 | goto out; | |
771 | ||
772 | buffer = global_trace.buffer; | |
773 | if (buffer) | |
774 | ring_buffer_record_disable(buffer); | |
775 | ||
776 | buffer = max_tr.buffer; | |
777 | if (buffer) | |
778 | ring_buffer_record_disable(buffer); | |
779 | ||
780 | out: | |
781 | spin_unlock_irqrestore(&tracing_start_lock, flags); | |
782 | } | |
783 | ||
e309b41d | 784 | void trace_stop_cmdline_recording(void); |
bc0c38d1 | 785 | |
e309b41d | 786 | static void trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
787 | { |
788 | unsigned map; | |
789 | unsigned idx; | |
790 | ||
791 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
792 | return; | |
793 | ||
794 | /* | |
795 | * It's not the end of the world if we don't get | |
796 | * the lock, but we also don't want to spin | |
797 | * nor do we want to disable interrupts, | |
798 | * so if we miss here, then better luck next time. | |
799 | */ | |
800 | if (!spin_trylock(&trace_cmdline_lock)) | |
801 | return; | |
802 | ||
803 | idx = map_pid_to_cmdline[tsk->pid]; | |
804 | if (idx >= SAVED_CMDLINES) { | |
805 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; | |
806 | ||
807 | map = map_cmdline_to_pid[idx]; | |
808 | if (map <= PID_MAX_DEFAULT) | |
809 | map_pid_to_cmdline[map] = (unsigned)-1; | |
810 | ||
811 | map_pid_to_cmdline[tsk->pid] = idx; | |
812 | ||
813 | cmdline_idx = idx; | |
814 | } | |
815 | ||
816 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); | |
817 | ||
818 | spin_unlock(&trace_cmdline_lock); | |
819 | } | |
820 | ||
660c7f9b | 821 | char *trace_find_cmdline(int pid) |
bc0c38d1 SR |
822 | { |
823 | char *cmdline = "<...>"; | |
824 | unsigned map; | |
825 | ||
826 | if (!pid) | |
827 | return "<idle>"; | |
828 | ||
829 | if (pid > PID_MAX_DEFAULT) | |
830 | goto out; | |
831 | ||
832 | map = map_pid_to_cmdline[pid]; | |
833 | if (map >= SAVED_CMDLINES) | |
834 | goto out; | |
835 | ||
836 | cmdline = saved_cmdlines[map]; | |
837 | ||
838 | out: | |
839 | return cmdline; | |
840 | } | |
841 | ||
e309b41d | 842 | void tracing_record_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
843 | { |
844 | if (atomic_read(&trace_record_cmdline_disabled)) | |
845 | return; | |
846 | ||
847 | trace_save_cmdline(tsk); | |
848 | } | |
849 | ||
45dcd8b8 | 850 | void |
38697053 SR |
851 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags, |
852 | int pc) | |
bc0c38d1 SR |
853 | { |
854 | struct task_struct *tsk = current; | |
bc0c38d1 | 855 | |
777e208d SR |
856 | entry->preempt_count = pc & 0xff; |
857 | entry->pid = (tsk) ? tsk->pid : 0; | |
b54d3de9 | 858 | entry->tgid = (tsk) ? tsk->tgid : 0; |
777e208d | 859 | entry->flags = |
9244489a | 860 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT |
2e2ca155 | 861 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
9244489a SR |
862 | #else |
863 | TRACE_FLAG_IRQS_NOSUPPORT | | |
864 | #endif | |
bc0c38d1 SR |
865 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
866 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | | |
867 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); | |
868 | } | |
869 | ||
e309b41d | 870 | void |
6fb44b71 | 871 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
38697053 SR |
872 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
873 | int pc) | |
bc0c38d1 | 874 | { |
3928a8a2 | 875 | struct ring_buffer_event *event; |
777e208d | 876 | struct ftrace_entry *entry; |
dcb6308f | 877 | unsigned long irq_flags; |
bc0c38d1 | 878 | |
d769041f SR |
879 | /* If we are reading the ring buffer, don't trace */ |
880 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) | |
881 | return; | |
882 | ||
3928a8a2 SR |
883 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
884 | &irq_flags); | |
885 | if (!event) | |
886 | return; | |
887 | entry = ring_buffer_event_data(event); | |
38697053 | 888 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
889 | entry->ent.type = TRACE_FN; |
890 | entry->ip = ip; | |
891 | entry->parent_ip = parent_ip; | |
3928a8a2 | 892 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
bc0c38d1 SR |
893 | } |
894 | ||
fb52607a | 895 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
287b6e68 FW |
896 | static void __trace_graph_entry(struct trace_array *tr, |
897 | struct trace_array_cpu *data, | |
898 | struct ftrace_graph_ent *trace, | |
899 | unsigned long flags, | |
900 | int pc) | |
901 | { | |
902 | struct ring_buffer_event *event; | |
903 | struct ftrace_graph_ent_entry *entry; | |
904 | unsigned long irq_flags; | |
905 | ||
906 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) | |
907 | return; | |
908 | ||
909 | event = ring_buffer_lock_reserve(global_trace.buffer, sizeof(*entry), | |
910 | &irq_flags); | |
911 | if (!event) | |
912 | return; | |
913 | entry = ring_buffer_event_data(event); | |
914 | tracing_generic_entry_update(&entry->ent, flags, pc); | |
915 | entry->ent.type = TRACE_GRAPH_ENT; | |
916 | entry->graph_ent = *trace; | |
917 | ring_buffer_unlock_commit(global_trace.buffer, event, irq_flags); | |
918 | } | |
919 | ||
920 | static void __trace_graph_return(struct trace_array *tr, | |
15e6cb36 | 921 | struct trace_array_cpu *data, |
fb52607a | 922 | struct ftrace_graph_ret *trace, |
15e6cb36 FW |
923 | unsigned long flags, |
924 | int pc) | |
925 | { | |
926 | struct ring_buffer_event *event; | |
287b6e68 | 927 | struct ftrace_graph_ret_entry *entry; |
15e6cb36 FW |
928 | unsigned long irq_flags; |
929 | ||
930 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) | |
931 | return; | |
932 | ||
933 | event = ring_buffer_lock_reserve(global_trace.buffer, sizeof(*entry), | |
934 | &irq_flags); | |
935 | if (!event) | |
936 | return; | |
937 | entry = ring_buffer_event_data(event); | |
938 | tracing_generic_entry_update(&entry->ent, flags, pc); | |
287b6e68 FW |
939 | entry->ent.type = TRACE_GRAPH_RET; |
940 | entry->ret = *trace; | |
15e6cb36 FW |
941 | ring_buffer_unlock_commit(global_trace.buffer, event, irq_flags); |
942 | } | |
943 | #endif | |
944 | ||
e309b41d | 945 | void |
2e0f5761 | 946 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
38697053 SR |
947 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
948 | int pc) | |
2e0f5761 IM |
949 | { |
950 | if (likely(!atomic_read(&data->disabled))) | |
38697053 | 951 | trace_function(tr, data, ip, parent_ip, flags, pc); |
2e0f5761 IM |
952 | } |
953 | ||
38697053 SR |
954 | static void ftrace_trace_stack(struct trace_array *tr, |
955 | struct trace_array_cpu *data, | |
956 | unsigned long flags, | |
957 | int skip, int pc) | |
86387f7e | 958 | { |
c2c80529 | 959 | #ifdef CONFIG_STACKTRACE |
3928a8a2 | 960 | struct ring_buffer_event *event; |
777e208d | 961 | struct stack_entry *entry; |
86387f7e | 962 | struct stack_trace trace; |
3928a8a2 | 963 | unsigned long irq_flags; |
86387f7e IM |
964 | |
965 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) | |
966 | return; | |
967 | ||
3928a8a2 SR |
968 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
969 | &irq_flags); | |
970 | if (!event) | |
971 | return; | |
972 | entry = ring_buffer_event_data(event); | |
38697053 | 973 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d | 974 | entry->ent.type = TRACE_STACK; |
86387f7e | 975 | |
777e208d | 976 | memset(&entry->caller, 0, sizeof(entry->caller)); |
86387f7e IM |
977 | |
978 | trace.nr_entries = 0; | |
979 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
980 | trace.skip = skip; | |
777e208d | 981 | trace.entries = entry->caller; |
86387f7e IM |
982 | |
983 | save_stack_trace(&trace); | |
3928a8a2 | 984 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
c2c80529 | 985 | #endif |
f0a920d5 IM |
986 | } |
987 | ||
38697053 SR |
988 | void __trace_stack(struct trace_array *tr, |
989 | struct trace_array_cpu *data, | |
990 | unsigned long flags, | |
991 | int skip) | |
992 | { | |
993 | ftrace_trace_stack(tr, data, flags, skip, preempt_count()); | |
994 | } | |
995 | ||
02b67518 TE |
996 | static void ftrace_trace_userstack(struct trace_array *tr, |
997 | struct trace_array_cpu *data, | |
998 | unsigned long flags, int pc) | |
999 | { | |
c7425acb | 1000 | #ifdef CONFIG_STACKTRACE |
8d7c6a96 | 1001 | struct ring_buffer_event *event; |
02b67518 TE |
1002 | struct userstack_entry *entry; |
1003 | struct stack_trace trace; | |
02b67518 TE |
1004 | unsigned long irq_flags; |
1005 | ||
1006 | if (!(trace_flags & TRACE_ITER_USERSTACKTRACE)) | |
1007 | return; | |
1008 | ||
1009 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), | |
1010 | &irq_flags); | |
1011 | if (!event) | |
1012 | return; | |
1013 | entry = ring_buffer_event_data(event); | |
1014 | tracing_generic_entry_update(&entry->ent, flags, pc); | |
1015 | entry->ent.type = TRACE_USER_STACK; | |
1016 | ||
1017 | memset(&entry->caller, 0, sizeof(entry->caller)); | |
1018 | ||
1019 | trace.nr_entries = 0; | |
1020 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
1021 | trace.skip = 0; | |
1022 | trace.entries = entry->caller; | |
1023 | ||
1024 | save_stack_trace_user(&trace); | |
1025 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); | |
c7425acb | 1026 | #endif |
02b67518 TE |
1027 | } |
1028 | ||
1029 | void __trace_userstack(struct trace_array *tr, | |
1030 | struct trace_array_cpu *data, | |
1031 | unsigned long flags) | |
1032 | { | |
1033 | ftrace_trace_userstack(tr, data, flags, preempt_count()); | |
1034 | } | |
1035 | ||
38697053 SR |
1036 | static void |
1037 | ftrace_trace_special(void *__tr, void *__data, | |
1038 | unsigned long arg1, unsigned long arg2, unsigned long arg3, | |
1039 | int pc) | |
a4feb834 | 1040 | { |
3928a8a2 | 1041 | struct ring_buffer_event *event; |
a4feb834 IM |
1042 | struct trace_array_cpu *data = __data; |
1043 | struct trace_array *tr = __tr; | |
777e208d | 1044 | struct special_entry *entry; |
a4feb834 IM |
1045 | unsigned long irq_flags; |
1046 | ||
3928a8a2 SR |
1047 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
1048 | &irq_flags); | |
1049 | if (!event) | |
1050 | return; | |
1051 | entry = ring_buffer_event_data(event); | |
38697053 | 1052 | tracing_generic_entry_update(&entry->ent, 0, pc); |
777e208d SR |
1053 | entry->ent.type = TRACE_SPECIAL; |
1054 | entry->arg1 = arg1; | |
1055 | entry->arg2 = arg2; | |
1056 | entry->arg3 = arg3; | |
3928a8a2 | 1057 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 1058 | ftrace_trace_stack(tr, data, irq_flags, 4, pc); |
02b67518 | 1059 | ftrace_trace_userstack(tr, data, irq_flags, pc); |
a4feb834 IM |
1060 | |
1061 | trace_wake_up(); | |
1062 | } | |
1063 | ||
38697053 SR |
1064 | void |
1065 | __trace_special(void *__tr, void *__data, | |
1066 | unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
1067 | { | |
1068 | ftrace_trace_special(__tr, __data, arg1, arg2, arg3, preempt_count()); | |
1069 | } | |
1070 | ||
e309b41d | 1071 | void |
bc0c38d1 SR |
1072 | tracing_sched_switch_trace(struct trace_array *tr, |
1073 | struct trace_array_cpu *data, | |
86387f7e IM |
1074 | struct task_struct *prev, |
1075 | struct task_struct *next, | |
38697053 | 1076 | unsigned long flags, int pc) |
bc0c38d1 | 1077 | { |
3928a8a2 | 1078 | struct ring_buffer_event *event; |
777e208d | 1079 | struct ctx_switch_entry *entry; |
dcb6308f | 1080 | unsigned long irq_flags; |
bc0c38d1 | 1081 | |
3928a8a2 SR |
1082 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
1083 | &irq_flags); | |
1084 | if (!event) | |
1085 | return; | |
1086 | entry = ring_buffer_event_data(event); | |
38697053 | 1087 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
1088 | entry->ent.type = TRACE_CTX; |
1089 | entry->prev_pid = prev->pid; | |
1090 | entry->prev_prio = prev->prio; | |
1091 | entry->prev_state = prev->state; | |
1092 | entry->next_pid = next->pid; | |
1093 | entry->next_prio = next->prio; | |
1094 | entry->next_state = next->state; | |
1095 | entry->next_cpu = task_cpu(next); | |
3928a8a2 | 1096 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 1097 | ftrace_trace_stack(tr, data, flags, 5, pc); |
02b67518 | 1098 | ftrace_trace_userstack(tr, data, flags, pc); |
bc0c38d1 SR |
1099 | } |
1100 | ||
57422797 IM |
1101 | void |
1102 | tracing_sched_wakeup_trace(struct trace_array *tr, | |
1103 | struct trace_array_cpu *data, | |
86387f7e IM |
1104 | struct task_struct *wakee, |
1105 | struct task_struct *curr, | |
38697053 | 1106 | unsigned long flags, int pc) |
57422797 | 1107 | { |
3928a8a2 | 1108 | struct ring_buffer_event *event; |
777e208d | 1109 | struct ctx_switch_entry *entry; |
57422797 IM |
1110 | unsigned long irq_flags; |
1111 | ||
3928a8a2 SR |
1112 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
1113 | &irq_flags); | |
1114 | if (!event) | |
1115 | return; | |
1116 | entry = ring_buffer_event_data(event); | |
38697053 | 1117 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
1118 | entry->ent.type = TRACE_WAKE; |
1119 | entry->prev_pid = curr->pid; | |
1120 | entry->prev_prio = curr->prio; | |
1121 | entry->prev_state = curr->state; | |
1122 | entry->next_pid = wakee->pid; | |
1123 | entry->next_prio = wakee->prio; | |
1124 | entry->next_state = wakee->state; | |
1125 | entry->next_cpu = task_cpu(wakee); | |
3928a8a2 | 1126 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 1127 | ftrace_trace_stack(tr, data, flags, 6, pc); |
02b67518 | 1128 | ftrace_trace_userstack(tr, data, flags, pc); |
017730c1 IM |
1129 | |
1130 | trace_wake_up(); | |
57422797 IM |
1131 | } |
1132 | ||
4902f884 SR |
1133 | void |
1134 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
1135 | { | |
1136 | struct trace_array *tr = &global_trace; | |
1137 | struct trace_array_cpu *data; | |
5aa1ba6a | 1138 | unsigned long flags; |
4902f884 | 1139 | int cpu; |
38697053 | 1140 | int pc; |
4902f884 | 1141 | |
c76f0694 | 1142 | if (tracing_disabled) |
4902f884 SR |
1143 | return; |
1144 | ||
38697053 | 1145 | pc = preempt_count(); |
5aa1ba6a | 1146 | local_irq_save(flags); |
4902f884 SR |
1147 | cpu = raw_smp_processor_id(); |
1148 | data = tr->data[cpu]; | |
4902f884 | 1149 | |
5aa1ba6a | 1150 | if (likely(atomic_inc_return(&data->disabled) == 1)) |
38697053 | 1151 | ftrace_trace_special(tr, data, arg1, arg2, arg3, pc); |
4902f884 | 1152 | |
5aa1ba6a SR |
1153 | atomic_dec(&data->disabled); |
1154 | local_irq_restore(flags); | |
4902f884 SR |
1155 | } |
1156 | ||
606576ce | 1157 | #ifdef CONFIG_FUNCTION_TRACER |
e309b41d | 1158 | static void |
b2a866f9 | 1159 | function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip) |
2e0f5761 IM |
1160 | { |
1161 | struct trace_array *tr = &global_trace; | |
1162 | struct trace_array_cpu *data; | |
1163 | unsigned long flags; | |
1164 | long disabled; | |
38697053 SR |
1165 | int cpu, resched; |
1166 | int pc; | |
2e0f5761 | 1167 | |
60bc0800 | 1168 | if (unlikely(!ftrace_function_enabled)) |
2e0f5761 IM |
1169 | return; |
1170 | ||
38697053 | 1171 | pc = preempt_count(); |
182e9f5f | 1172 | resched = ftrace_preempt_disable(); |
38697053 | 1173 | local_save_flags(flags); |
2e0f5761 IM |
1174 | cpu = raw_smp_processor_id(); |
1175 | data = tr->data[cpu]; | |
1176 | disabled = atomic_inc_return(&data->disabled); | |
1177 | ||
1178 | if (likely(disabled == 1)) | |
38697053 | 1179 | trace_function(tr, data, ip, parent_ip, flags, pc); |
2e0f5761 IM |
1180 | |
1181 | atomic_dec(&data->disabled); | |
182e9f5f | 1182 | ftrace_preempt_enable(resched); |
2e0f5761 IM |
1183 | } |
1184 | ||
b2a866f9 SR |
1185 | static void |
1186 | function_trace_call(unsigned long ip, unsigned long parent_ip) | |
1187 | { | |
1188 | struct trace_array *tr = &global_trace; | |
1189 | struct trace_array_cpu *data; | |
1190 | unsigned long flags; | |
1191 | long disabled; | |
1192 | int cpu; | |
1193 | int pc; | |
1194 | ||
1195 | if (unlikely(!ftrace_function_enabled)) | |
1196 | return; | |
1197 | ||
1198 | /* | |
1199 | * Need to use raw, since this must be called before the | |
1200 | * recursive protection is performed. | |
1201 | */ | |
d51ad7ac | 1202 | local_irq_save(flags); |
b2a866f9 SR |
1203 | cpu = raw_smp_processor_id(); |
1204 | data = tr->data[cpu]; | |
1205 | disabled = atomic_inc_return(&data->disabled); | |
1206 | ||
1207 | if (likely(disabled == 1)) { | |
1208 | pc = preempt_count(); | |
1209 | trace_function(tr, data, ip, parent_ip, flags, pc); | |
1210 | } | |
1211 | ||
1212 | atomic_dec(&data->disabled); | |
d51ad7ac | 1213 | local_irq_restore(flags); |
b2a866f9 SR |
1214 | } |
1215 | ||
fb52607a | 1216 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
e49dc19c | 1217 | int trace_graph_entry(struct ftrace_graph_ent *trace) |
15e6cb36 FW |
1218 | { |
1219 | struct trace_array *tr = &global_trace; | |
1220 | struct trace_array_cpu *data; | |
1221 | unsigned long flags; | |
1222 | long disabled; | |
1223 | int cpu; | |
1224 | int pc; | |
1225 | ||
804a6851 SR |
1226 | if (!ftrace_trace_task(current)) |
1227 | return 0; | |
1228 | ||
ea4e2bc4 SR |
1229 | if (!ftrace_graph_addr(trace->func)) |
1230 | return 0; | |
1231 | ||
a5e25883 | 1232 | local_irq_save(flags); |
15e6cb36 FW |
1233 | cpu = raw_smp_processor_id(); |
1234 | data = tr->data[cpu]; | |
1235 | disabled = atomic_inc_return(&data->disabled); | |
1236 | if (likely(disabled == 1)) { | |
1237 | pc = preempt_count(); | |
287b6e68 FW |
1238 | __trace_graph_entry(tr, data, trace, flags, pc); |
1239 | } | |
ea4e2bc4 SR |
1240 | /* Only do the atomic if it is not already set */ |
1241 | if (!test_tsk_trace_graph(current)) | |
1242 | set_tsk_trace_graph(current); | |
287b6e68 | 1243 | atomic_dec(&data->disabled); |
a5e25883 | 1244 | local_irq_restore(flags); |
e49dc19c SR |
1245 | |
1246 | return 1; | |
287b6e68 FW |
1247 | } |
1248 | ||
1249 | void trace_graph_return(struct ftrace_graph_ret *trace) | |
1250 | { | |
1251 | struct trace_array *tr = &global_trace; | |
1252 | struct trace_array_cpu *data; | |
1253 | unsigned long flags; | |
1254 | long disabled; | |
1255 | int cpu; | |
1256 | int pc; | |
1257 | ||
a5e25883 | 1258 | local_irq_save(flags); |
287b6e68 FW |
1259 | cpu = raw_smp_processor_id(); |
1260 | data = tr->data[cpu]; | |
1261 | disabled = atomic_inc_return(&data->disabled); | |
1262 | if (likely(disabled == 1)) { | |
1263 | pc = preempt_count(); | |
1264 | __trace_graph_return(tr, data, trace, flags, pc); | |
15e6cb36 | 1265 | } |
ea4e2bc4 SR |
1266 | if (!trace->depth) |
1267 | clear_tsk_trace_graph(current); | |
15e6cb36 | 1268 | atomic_dec(&data->disabled); |
a5e25883 | 1269 | local_irq_restore(flags); |
15e6cb36 | 1270 | } |
fb52607a | 1271 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 1272 | |
2e0f5761 IM |
1273 | static struct ftrace_ops trace_ops __read_mostly = |
1274 | { | |
1275 | .func = function_trace_call, | |
1276 | }; | |
1277 | ||
e309b41d | 1278 | void tracing_start_function_trace(void) |
2e0f5761 | 1279 | { |
60bc0800 | 1280 | ftrace_function_enabled = 0; |
b2a866f9 SR |
1281 | |
1282 | if (trace_flags & TRACE_ITER_PREEMPTONLY) | |
1283 | trace_ops.func = function_trace_call_preempt_only; | |
1284 | else | |
1285 | trace_ops.func = function_trace_call; | |
1286 | ||
2e0f5761 | 1287 | register_ftrace_function(&trace_ops); |
9036990d | 1288 | ftrace_function_enabled = 1; |
2e0f5761 IM |
1289 | } |
1290 | ||
e309b41d | 1291 | void tracing_stop_function_trace(void) |
2e0f5761 | 1292 | { |
60bc0800 | 1293 | ftrace_function_enabled = 0; |
2e0f5761 IM |
1294 | unregister_ftrace_function(&trace_ops); |
1295 | } | |
1296 | #endif | |
1297 | ||
bc0c38d1 SR |
1298 | enum trace_file_type { |
1299 | TRACE_FILE_LAT_FMT = 1, | |
12ef7d44 | 1300 | TRACE_FILE_ANNOTATE = 2, |
bc0c38d1 SR |
1301 | }; |
1302 | ||
5a90f577 SR |
1303 | static void trace_iterator_increment(struct trace_iterator *iter, int cpu) |
1304 | { | |
d769041f SR |
1305 | /* Don't allow ftrace to trace into the ring buffers */ |
1306 | ftrace_disable_cpu(); | |
1307 | ||
5a90f577 | 1308 | iter->idx++; |
d769041f SR |
1309 | if (iter->buffer_iter[iter->cpu]) |
1310 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); | |
1311 | ||
1312 | ftrace_enable_cpu(); | |
5a90f577 SR |
1313 | } |
1314 | ||
e309b41d | 1315 | static struct trace_entry * |
3928a8a2 | 1316 | peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts) |
dd0e545f | 1317 | { |
3928a8a2 SR |
1318 | struct ring_buffer_event *event; |
1319 | struct ring_buffer_iter *buf_iter = iter->buffer_iter[cpu]; | |
dd0e545f | 1320 | |
d769041f SR |
1321 | /* Don't allow ftrace to trace into the ring buffers */ |
1322 | ftrace_disable_cpu(); | |
1323 | ||
1324 | if (buf_iter) | |
1325 | event = ring_buffer_iter_peek(buf_iter, ts); | |
1326 | else | |
1327 | event = ring_buffer_peek(iter->tr->buffer, cpu, ts); | |
1328 | ||
1329 | ftrace_enable_cpu(); | |
1330 | ||
3928a8a2 | 1331 | return event ? ring_buffer_event_data(event) : NULL; |
dd0e545f | 1332 | } |
d769041f | 1333 | |
dd0e545f | 1334 | static struct trace_entry * |
3928a8a2 | 1335 | __find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
bc0c38d1 | 1336 | { |
3928a8a2 | 1337 | struct ring_buffer *buffer = iter->tr->buffer; |
bc0c38d1 | 1338 | struct trace_entry *ent, *next = NULL; |
3928a8a2 | 1339 | u64 next_ts = 0, ts; |
bc0c38d1 SR |
1340 | int next_cpu = -1; |
1341 | int cpu; | |
1342 | ||
ab46428c | 1343 | for_each_tracing_cpu(cpu) { |
dd0e545f | 1344 | |
3928a8a2 SR |
1345 | if (ring_buffer_empty_cpu(buffer, cpu)) |
1346 | continue; | |
dd0e545f | 1347 | |
3928a8a2 | 1348 | ent = peek_next_entry(iter, cpu, &ts); |
dd0e545f | 1349 | |
cdd31cd2 IM |
1350 | /* |
1351 | * Pick the entry with the smallest timestamp: | |
1352 | */ | |
3928a8a2 | 1353 | if (ent && (!next || ts < next_ts)) { |
bc0c38d1 SR |
1354 | next = ent; |
1355 | next_cpu = cpu; | |
3928a8a2 | 1356 | next_ts = ts; |
bc0c38d1 SR |
1357 | } |
1358 | } | |
1359 | ||
1360 | if (ent_cpu) | |
1361 | *ent_cpu = next_cpu; | |
1362 | ||
3928a8a2 SR |
1363 | if (ent_ts) |
1364 | *ent_ts = next_ts; | |
1365 | ||
bc0c38d1 SR |
1366 | return next; |
1367 | } | |
1368 | ||
dd0e545f SR |
1369 | /* Find the next real entry, without updating the iterator itself */ |
1370 | static struct trace_entry * | |
3928a8a2 | 1371 | find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
bc0c38d1 | 1372 | { |
3928a8a2 | 1373 | return __find_next_entry(iter, ent_cpu, ent_ts); |
dd0e545f SR |
1374 | } |
1375 | ||
1376 | /* Find the next real entry, and increment the iterator to the next entry */ | |
1377 | static void *find_next_entry_inc(struct trace_iterator *iter) | |
1378 | { | |
3928a8a2 | 1379 | iter->ent = __find_next_entry(iter, &iter->cpu, &iter->ts); |
dd0e545f | 1380 | |
3928a8a2 | 1381 | if (iter->ent) |
dd0e545f SR |
1382 | trace_iterator_increment(iter, iter->cpu); |
1383 | ||
3928a8a2 | 1384 | return iter->ent ? iter : NULL; |
b3806b43 | 1385 | } |
bc0c38d1 | 1386 | |
e309b41d | 1387 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 | 1388 | { |
d769041f SR |
1389 | /* Don't allow ftrace to trace into the ring buffers */ |
1390 | ftrace_disable_cpu(); | |
3928a8a2 | 1391 | ring_buffer_consume(iter->tr->buffer, iter->cpu, &iter->ts); |
d769041f | 1392 | ftrace_enable_cpu(); |
bc0c38d1 SR |
1393 | } |
1394 | ||
e309b41d | 1395 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
1396 | { |
1397 | struct trace_iterator *iter = m->private; | |
bc0c38d1 | 1398 | int i = (int)*pos; |
4e3c3333 | 1399 | void *ent; |
bc0c38d1 SR |
1400 | |
1401 | (*pos)++; | |
1402 | ||
1403 | /* can't go backwards */ | |
1404 | if (iter->idx > i) | |
1405 | return NULL; | |
1406 | ||
1407 | if (iter->idx < 0) | |
1408 | ent = find_next_entry_inc(iter); | |
1409 | else | |
1410 | ent = iter; | |
1411 | ||
1412 | while (ent && iter->idx < i) | |
1413 | ent = find_next_entry_inc(iter); | |
1414 | ||
1415 | iter->pos = *pos; | |
1416 | ||
bc0c38d1 SR |
1417 | return ent; |
1418 | } | |
1419 | ||
1420 | static void *s_start(struct seq_file *m, loff_t *pos) | |
1421 | { | |
1422 | struct trace_iterator *iter = m->private; | |
1423 | void *p = NULL; | |
1424 | loff_t l = 0; | |
3928a8a2 | 1425 | int cpu; |
bc0c38d1 SR |
1426 | |
1427 | mutex_lock(&trace_types_lock); | |
1428 | ||
d15f57f2 SR |
1429 | if (!current_trace || current_trace != iter->trace) { |
1430 | mutex_unlock(&trace_types_lock); | |
bc0c38d1 | 1431 | return NULL; |
d15f57f2 | 1432 | } |
bc0c38d1 SR |
1433 | |
1434 | atomic_inc(&trace_record_cmdline_disabled); | |
1435 | ||
bc0c38d1 SR |
1436 | if (*pos != iter->pos) { |
1437 | iter->ent = NULL; | |
1438 | iter->cpu = 0; | |
1439 | iter->idx = -1; | |
1440 | ||
d769041f SR |
1441 | ftrace_disable_cpu(); |
1442 | ||
3928a8a2 SR |
1443 | for_each_tracing_cpu(cpu) { |
1444 | ring_buffer_iter_reset(iter->buffer_iter[cpu]); | |
4c11d7ae | 1445 | } |
bc0c38d1 | 1446 | |
d769041f SR |
1447 | ftrace_enable_cpu(); |
1448 | ||
bc0c38d1 SR |
1449 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
1450 | ; | |
1451 | ||
1452 | } else { | |
4c11d7ae | 1453 | l = *pos - 1; |
bc0c38d1 SR |
1454 | p = s_next(m, p, &l); |
1455 | } | |
1456 | ||
1457 | return p; | |
1458 | } | |
1459 | ||
1460 | static void s_stop(struct seq_file *m, void *p) | |
1461 | { | |
bc0c38d1 | 1462 | atomic_dec(&trace_record_cmdline_disabled); |
bc0c38d1 SR |
1463 | mutex_unlock(&trace_types_lock); |
1464 | } | |
1465 | ||
76094a2c | 1466 | #ifdef CONFIG_KRETPROBES |
b3aa5577 | 1467 | static inline const char *kretprobed(const char *name) |
76094a2c | 1468 | { |
b3aa5577 SR |
1469 | static const char tramp_name[] = "kretprobe_trampoline"; |
1470 | int size = sizeof(tramp_name); | |
1471 | ||
1472 | if (strncmp(tramp_name, name, size) == 0) | |
1473 | return "[unknown/kretprobe'd]"; | |
1474 | return name; | |
76094a2c AS |
1475 | } |
1476 | #else | |
b3aa5577 | 1477 | static inline const char *kretprobed(const char *name) |
76094a2c | 1478 | { |
b3aa5577 | 1479 | return name; |
76094a2c AS |
1480 | } |
1481 | #endif /* CONFIG_KRETPROBES */ | |
1482 | ||
b3806b43 | 1483 | static int |
214023c3 | 1484 | seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) |
bc0c38d1 SR |
1485 | { |
1486 | #ifdef CONFIG_KALLSYMS | |
1487 | char str[KSYM_SYMBOL_LEN]; | |
b3aa5577 | 1488 | const char *name; |
bc0c38d1 SR |
1489 | |
1490 | kallsyms_lookup(address, NULL, NULL, NULL, str); | |
1491 | ||
b3aa5577 SR |
1492 | name = kretprobed(str); |
1493 | ||
1494 | return trace_seq_printf(s, fmt, name); | |
bc0c38d1 | 1495 | #endif |
b3806b43 | 1496 | return 1; |
bc0c38d1 SR |
1497 | } |
1498 | ||
b3806b43 | 1499 | static int |
214023c3 SR |
1500 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
1501 | unsigned long address) | |
bc0c38d1 SR |
1502 | { |
1503 | #ifdef CONFIG_KALLSYMS | |
1504 | char str[KSYM_SYMBOL_LEN]; | |
b3aa5577 | 1505 | const char *name; |
bc0c38d1 SR |
1506 | |
1507 | sprint_symbol(str, address); | |
b3aa5577 SR |
1508 | name = kretprobed(str); |
1509 | ||
1510 | return trace_seq_printf(s, fmt, name); | |
bc0c38d1 | 1511 | #endif |
b3806b43 | 1512 | return 1; |
bc0c38d1 SR |
1513 | } |
1514 | ||
1515 | #ifndef CONFIG_64BIT | |
1516 | # define IP_FMT "%08lx" | |
1517 | #else | |
1518 | # define IP_FMT "%016lx" | |
1519 | #endif | |
1520 | ||
15e6cb36 | 1521 | int |
214023c3 | 1522 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) |
bc0c38d1 | 1523 | { |
b3806b43 SR |
1524 | int ret; |
1525 | ||
1526 | if (!ip) | |
1527 | return trace_seq_printf(s, "0"); | |
bc0c38d1 SR |
1528 | |
1529 | if (sym_flags & TRACE_ITER_SYM_OFFSET) | |
b3806b43 | 1530 | ret = seq_print_sym_offset(s, "%s", ip); |
bc0c38d1 | 1531 | else |
b3806b43 SR |
1532 | ret = seq_print_sym_short(s, "%s", ip); |
1533 | ||
1534 | if (!ret) | |
1535 | return 0; | |
bc0c38d1 SR |
1536 | |
1537 | if (sym_flags & TRACE_ITER_SYM_ADDR) | |
b3806b43 SR |
1538 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
1539 | return ret; | |
bc0c38d1 SR |
1540 | } |
1541 | ||
b54d3de9 TE |
1542 | static inline int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, |
1543 | unsigned long ip, unsigned long sym_flags) | |
1544 | { | |
1545 | struct file *file = NULL; | |
1546 | unsigned long vmstart = 0; | |
1547 | int ret = 1; | |
1548 | ||
1549 | if (mm) { | |
cffa10ae TE |
1550 | const struct vm_area_struct *vma; |
1551 | ||
1552 | down_read(&mm->mmap_sem); | |
1553 | vma = find_vma(mm, ip); | |
b54d3de9 TE |
1554 | if (vma) { |
1555 | file = vma->vm_file; | |
1556 | vmstart = vma->vm_start; | |
1557 | } | |
e38da592 TE |
1558 | if (file) { |
1559 | ret = trace_seq_path(s, &file->f_path); | |
1560 | if (ret) | |
1561 | ret = trace_seq_printf(s, "[+0x%lx]", ip - vmstart); | |
1562 | } | |
cffa10ae | 1563 | up_read(&mm->mmap_sem); |
b54d3de9 | 1564 | } |
b54d3de9 TE |
1565 | if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file)) |
1566 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); | |
1567 | return ret; | |
1568 | } | |
1569 | ||
02b67518 TE |
1570 | static int |
1571 | seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s, | |
b54d3de9 | 1572 | unsigned long sym_flags) |
02b67518 | 1573 | { |
b54d3de9 | 1574 | struct mm_struct *mm = NULL; |
02b67518 | 1575 | int ret = 1; |
8d7c6a96 | 1576 | unsigned int i; |
02b67518 | 1577 | |
b54d3de9 TE |
1578 | if (trace_flags & TRACE_ITER_SYM_USEROBJ) { |
1579 | struct task_struct *task; | |
1580 | /* | |
1581 | * we do the lookup on the thread group leader, | |
1582 | * since individual threads might have already quit! | |
1583 | */ | |
1584 | rcu_read_lock(); | |
1585 | task = find_task_by_vpid(entry->ent.tgid); | |
b54d3de9 TE |
1586 | if (task) |
1587 | mm = get_task_mm(task); | |
cffa10ae | 1588 | rcu_read_unlock(); |
b54d3de9 TE |
1589 | } |
1590 | ||
02b67518 TE |
1591 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
1592 | unsigned long ip = entry->caller[i]; | |
1593 | ||
1594 | if (ip == ULONG_MAX || !ret) | |
1595 | break; | |
b54d3de9 | 1596 | if (i && ret) |
02b67518 TE |
1597 | ret = trace_seq_puts(s, " <- "); |
1598 | if (!ip) { | |
b54d3de9 TE |
1599 | if (ret) |
1600 | ret = trace_seq_puts(s, "??"); | |
02b67518 TE |
1601 | continue; |
1602 | } | |
b54d3de9 TE |
1603 | if (!ret) |
1604 | break; | |
1605 | if (ret) | |
1606 | ret = seq_print_user_ip(s, mm, ip, sym_flags); | |
02b67518 TE |
1607 | } |
1608 | ||
b54d3de9 TE |
1609 | if (mm) |
1610 | mmput(mm); | |
02b67518 TE |
1611 | return ret; |
1612 | } | |
1613 | ||
e309b41d | 1614 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 | 1615 | { |
a6168353 ME |
1616 | seq_puts(m, "# _------=> CPU# \n"); |
1617 | seq_puts(m, "# / _-----=> irqs-off \n"); | |
1618 | seq_puts(m, "# | / _----=> need-resched \n"); | |
1619 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); | |
1620 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); | |
1621 | seq_puts(m, "# |||| / \n"); | |
1622 | seq_puts(m, "# ||||| delay \n"); | |
1623 | seq_puts(m, "# cmd pid ||||| time | caller \n"); | |
1624 | seq_puts(m, "# \\ / ||||| \\ | / \n"); | |
bc0c38d1 SR |
1625 | } |
1626 | ||
e309b41d | 1627 | static void print_func_help_header(struct seq_file *m) |
bc0c38d1 | 1628 | { |
a6168353 ME |
1629 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
1630 | seq_puts(m, "# | | | | |\n"); | |
bc0c38d1 SR |
1631 | } |
1632 | ||
1633 | ||
e309b41d | 1634 | static void |
bc0c38d1 SR |
1635 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
1636 | { | |
1637 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); | |
1638 | struct trace_array *tr = iter->tr; | |
1639 | struct trace_array_cpu *data = tr->data[tr->cpu]; | |
1640 | struct tracer *type = current_trace; | |
3928a8a2 SR |
1641 | unsigned long total; |
1642 | unsigned long entries; | |
bc0c38d1 SR |
1643 | const char *name = "preemption"; |
1644 | ||
1645 | if (type) | |
1646 | name = type->name; | |
1647 | ||
3928a8a2 SR |
1648 | entries = ring_buffer_entries(iter->tr->buffer); |
1649 | total = entries + | |
1650 | ring_buffer_overruns(iter->tr->buffer); | |
bc0c38d1 SR |
1651 | |
1652 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", | |
1653 | name, UTS_RELEASE); | |
1654 | seq_puts(m, "-----------------------------------" | |
1655 | "---------------------------------\n"); | |
1656 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" | |
1657 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", | |
57f50be1 | 1658 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 1659 | entries, |
4c11d7ae | 1660 | total, |
bc0c38d1 SR |
1661 | tr->cpu, |
1662 | #if defined(CONFIG_PREEMPT_NONE) | |
1663 | "server", | |
1664 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
1665 | "desktop", | |
b5c21b45 | 1666 | #elif defined(CONFIG_PREEMPT) |
bc0c38d1 SR |
1667 | "preempt", |
1668 | #else | |
1669 | "unknown", | |
1670 | #endif | |
1671 | /* These are reserved for later use */ | |
1672 | 0, 0, 0, 0); | |
1673 | #ifdef CONFIG_SMP | |
1674 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
1675 | #else | |
1676 | seq_puts(m, ")\n"); | |
1677 | #endif | |
1678 | seq_puts(m, " -----------------\n"); | |
1679 | seq_printf(m, " | task: %.16s-%d " | |
1680 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", | |
1681 | data->comm, data->pid, data->uid, data->nice, | |
1682 | data->policy, data->rt_priority); | |
1683 | seq_puts(m, " -----------------\n"); | |
1684 | ||
1685 | if (data->critical_start) { | |
1686 | seq_puts(m, " => started at: "); | |
214023c3 SR |
1687 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
1688 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 | 1689 | seq_puts(m, "\n => ended at: "); |
214023c3 SR |
1690 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
1691 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 SR |
1692 | seq_puts(m, "\n"); |
1693 | } | |
1694 | ||
1695 | seq_puts(m, "\n"); | |
1696 | } | |
1697 | ||
e309b41d | 1698 | static void |
214023c3 | 1699 | lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) |
bc0c38d1 SR |
1700 | { |
1701 | int hardirq, softirq; | |
1702 | char *comm; | |
1703 | ||
777e208d | 1704 | comm = trace_find_cmdline(entry->pid); |
bc0c38d1 | 1705 | |
777e208d | 1706 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
a6168353 | 1707 | trace_seq_printf(s, "%3d", cpu); |
214023c3 | 1708 | trace_seq_printf(s, "%c%c", |
9244489a SR |
1709 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : |
1710 | (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : '.', | |
777e208d | 1711 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); |
bc0c38d1 | 1712 | |
777e208d SR |
1713 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; |
1714 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; | |
afc2abc0 | 1715 | if (hardirq && softirq) { |
214023c3 | 1716 | trace_seq_putc(s, 'H'); |
afc2abc0 IM |
1717 | } else { |
1718 | if (hardirq) { | |
214023c3 | 1719 | trace_seq_putc(s, 'h'); |
afc2abc0 | 1720 | } else { |
bc0c38d1 | 1721 | if (softirq) |
214023c3 | 1722 | trace_seq_putc(s, 's'); |
bc0c38d1 | 1723 | else |
214023c3 | 1724 | trace_seq_putc(s, '.'); |
bc0c38d1 SR |
1725 | } |
1726 | } | |
1727 | ||
777e208d SR |
1728 | if (entry->preempt_count) |
1729 | trace_seq_printf(s, "%x", entry->preempt_count); | |
bc0c38d1 | 1730 | else |
214023c3 | 1731 | trace_seq_puts(s, "."); |
bc0c38d1 SR |
1732 | } |
1733 | ||
1734 | unsigned long preempt_mark_thresh = 100; | |
1735 | ||
e309b41d | 1736 | static void |
3928a8a2 | 1737 | lat_print_timestamp(struct trace_seq *s, u64 abs_usecs, |
bc0c38d1 SR |
1738 | unsigned long rel_usecs) |
1739 | { | |
214023c3 | 1740 | trace_seq_printf(s, " %4lldus", abs_usecs); |
bc0c38d1 | 1741 | if (rel_usecs > preempt_mark_thresh) |
214023c3 | 1742 | trace_seq_puts(s, "!: "); |
bc0c38d1 | 1743 | else if (rel_usecs > 1) |
214023c3 | 1744 | trace_seq_puts(s, "+: "); |
bc0c38d1 | 1745 | else |
214023c3 | 1746 | trace_seq_puts(s, " : "); |
bc0c38d1 SR |
1747 | } |
1748 | ||
1749 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; | |
1750 | ||
3d9101e9 TG |
1751 | static int task_state_char(unsigned long state) |
1752 | { | |
1753 | int bit = state ? __ffs(state) + 1 : 0; | |
1754 | ||
1755 | return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?'; | |
1756 | } | |
1757 | ||
fc5e27ae PP |
1758 | /* |
1759 | * The message is supposed to contain an ending newline. | |
1760 | * If the printing stops prematurely, try to add a newline of our own. | |
1761 | */ | |
1762 | void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter) | |
dd0e545f | 1763 | { |
dd0e545f | 1764 | struct trace_entry *ent; |
777e208d | 1765 | struct trace_field_cont *cont; |
fc5e27ae | 1766 | bool ok = true; |
dd0e545f | 1767 | |
3928a8a2 | 1768 | ent = peek_next_entry(iter, iter->cpu, NULL); |
dd0e545f SR |
1769 | if (!ent || ent->type != TRACE_CONT) { |
1770 | trace_seq_putc(s, '\n'); | |
1771 | return; | |
1772 | } | |
1773 | ||
1774 | do { | |
777e208d | 1775 | cont = (struct trace_field_cont *)ent; |
fc5e27ae | 1776 | if (ok) |
777e208d | 1777 | ok = (trace_seq_printf(s, "%s", cont->buf) > 0); |
d769041f SR |
1778 | |
1779 | ftrace_disable_cpu(); | |
1780 | ||
1781 | if (iter->buffer_iter[iter->cpu]) | |
1782 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); | |
1783 | else | |
1784 | ring_buffer_consume(iter->tr->buffer, iter->cpu, NULL); | |
1785 | ||
1786 | ftrace_enable_cpu(); | |
1787 | ||
3928a8a2 | 1788 | ent = peek_next_entry(iter, iter->cpu, NULL); |
dd0e545f | 1789 | } while (ent && ent->type == TRACE_CONT); |
fc5e27ae PP |
1790 | |
1791 | if (!ok) | |
1792 | trace_seq_putc(s, '\n'); | |
dd0e545f SR |
1793 | } |
1794 | ||
a309720c SR |
1795 | static void test_cpu_buff_start(struct trace_iterator *iter) |
1796 | { | |
1797 | struct trace_seq *s = &iter->seq; | |
1798 | ||
12ef7d44 SR |
1799 | if (!(trace_flags & TRACE_ITER_ANNOTATE)) |
1800 | return; | |
1801 | ||
1802 | if (!(iter->iter_flags & TRACE_FILE_ANNOTATE)) | |
1803 | return; | |
1804 | ||
a309720c SR |
1805 | if (cpu_isset(iter->cpu, iter->started)) |
1806 | return; | |
1807 | ||
1808 | cpu_set(iter->cpu, iter->started); | |
1809 | trace_seq_printf(s, "##### CPU %u buffer started ####\n", iter->cpu); | |
1810 | } | |
1811 | ||
2c4f035f | 1812 | static enum print_line_t |
214023c3 | 1813 | print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) |
bc0c38d1 | 1814 | { |
214023c3 | 1815 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1816 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
3928a8a2 | 1817 | struct trace_entry *next_entry; |
bc0c38d1 SR |
1818 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); |
1819 | struct trace_entry *entry = iter->ent; | |
1820 | unsigned long abs_usecs; | |
1821 | unsigned long rel_usecs; | |
3928a8a2 | 1822 | u64 next_ts; |
bc0c38d1 | 1823 | char *comm; |
bac524d3 | 1824 | int S, T; |
86387f7e | 1825 | int i; |
bc0c38d1 | 1826 | |
dd0e545f | 1827 | if (entry->type == TRACE_CONT) |
2c4f035f | 1828 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1829 | |
a309720c SR |
1830 | test_cpu_buff_start(iter); |
1831 | ||
3928a8a2 SR |
1832 | next_entry = find_next_entry(iter, NULL, &next_ts); |
1833 | if (!next_entry) | |
1834 | next_ts = iter->ts; | |
1835 | rel_usecs = ns2usecs(next_ts - iter->ts); | |
1836 | abs_usecs = ns2usecs(iter->ts - iter->tr->time_start); | |
bc0c38d1 SR |
1837 | |
1838 | if (verbose) { | |
777e208d | 1839 | comm = trace_find_cmdline(entry->pid); |
a6168353 | 1840 | trace_seq_printf(s, "%16s %5d %3d %d %08x %08x [%08lx]" |
214023c3 SR |
1841 | " %ld.%03ldms (+%ld.%03ldms): ", |
1842 | comm, | |
777e208d SR |
1843 | entry->pid, cpu, entry->flags, |
1844 | entry->preempt_count, trace_idx, | |
3928a8a2 | 1845 | ns2usecs(iter->ts), |
214023c3 SR |
1846 | abs_usecs/1000, |
1847 | abs_usecs % 1000, rel_usecs/1000, | |
1848 | rel_usecs % 1000); | |
bc0c38d1 | 1849 | } else { |
f29c73fe IM |
1850 | lat_print_generic(s, entry, cpu); |
1851 | lat_print_timestamp(s, abs_usecs, rel_usecs); | |
bc0c38d1 SR |
1852 | } |
1853 | switch (entry->type) { | |
777e208d | 1854 | case TRACE_FN: { |
7104f300 SR |
1855 | struct ftrace_entry *field; |
1856 | ||
1857 | trace_assign_type(field, entry); | |
777e208d SR |
1858 | |
1859 | seq_print_ip_sym(s, field->ip, sym_flags); | |
214023c3 | 1860 | trace_seq_puts(s, " ("); |
b3aa5577 | 1861 | seq_print_ip_sym(s, field->parent_ip, sym_flags); |
214023c3 | 1862 | trace_seq_puts(s, ")\n"); |
bc0c38d1 | 1863 | break; |
777e208d | 1864 | } |
bc0c38d1 | 1865 | case TRACE_CTX: |
777e208d | 1866 | case TRACE_WAKE: { |
7104f300 SR |
1867 | struct ctx_switch_entry *field; |
1868 | ||
1869 | trace_assign_type(field, entry); | |
777e208d | 1870 | |
3d9101e9 TG |
1871 | T = task_state_char(field->next_state); |
1872 | S = task_state_char(field->prev_state); | |
777e208d | 1873 | comm = trace_find_cmdline(field->next_pid); |
80b5e940 | 1874 | trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n", |
777e208d SR |
1875 | field->prev_pid, |
1876 | field->prev_prio, | |
57422797 | 1877 | S, entry->type == TRACE_CTX ? "==>" : " +", |
777e208d SR |
1878 | field->next_cpu, |
1879 | field->next_pid, | |
1880 | field->next_prio, | |
bac524d3 | 1881 | T, comm); |
bc0c38d1 | 1882 | break; |
777e208d SR |
1883 | } |
1884 | case TRACE_SPECIAL: { | |
7104f300 SR |
1885 | struct special_entry *field; |
1886 | ||
1887 | trace_assign_type(field, entry); | |
777e208d | 1888 | |
88a4216c | 1889 | trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
1890 | field->arg1, |
1891 | field->arg2, | |
1892 | field->arg3); | |
f0a920d5 | 1893 | break; |
777e208d SR |
1894 | } |
1895 | case TRACE_STACK: { | |
7104f300 SR |
1896 | struct stack_entry *field; |
1897 | ||
1898 | trace_assign_type(field, entry); | |
777e208d | 1899 | |
86387f7e IM |
1900 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
1901 | if (i) | |
1902 | trace_seq_puts(s, " <= "); | |
777e208d | 1903 | seq_print_ip_sym(s, field->caller[i], sym_flags); |
86387f7e IM |
1904 | } |
1905 | trace_seq_puts(s, "\n"); | |
1906 | break; | |
777e208d SR |
1907 | } |
1908 | case TRACE_PRINT: { | |
7104f300 SR |
1909 | struct print_entry *field; |
1910 | ||
1911 | trace_assign_type(field, entry); | |
777e208d SR |
1912 | |
1913 | seq_print_ip_sym(s, field->ip, sym_flags); | |
1914 | trace_seq_printf(s, ": %s", field->buf); | |
1915 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
1916 | trace_seq_print_cont(s, iter); |
1917 | break; | |
777e208d | 1918 | } |
9f029e83 SR |
1919 | case TRACE_BRANCH: { |
1920 | struct trace_branch *field; | |
52f232cb SR |
1921 | |
1922 | trace_assign_type(field, entry); | |
1923 | ||
1924 | trace_seq_printf(s, "[%s] %s:%s:%d\n", | |
68d119f0 | 1925 | field->correct ? " ok " : " MISS ", |
52f232cb SR |
1926 | field->func, |
1927 | field->file, | |
1928 | field->line); | |
1929 | break; | |
1930 | } | |
02b67518 TE |
1931 | case TRACE_USER_STACK: { |
1932 | struct userstack_entry *field; | |
1933 | ||
1934 | trace_assign_type(field, entry); | |
1935 | ||
1936 | seq_print_userip_objs(field, s, sym_flags); | |
b54d3de9 | 1937 | trace_seq_putc(s, '\n'); |
02b67518 TE |
1938 | break; |
1939 | } | |
89b2f978 | 1940 | default: |
214023c3 | 1941 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
bc0c38d1 | 1942 | } |
2c4f035f | 1943 | return TRACE_TYPE_HANDLED; |
bc0c38d1 SR |
1944 | } |
1945 | ||
2c4f035f | 1946 | static enum print_line_t print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 1947 | { |
214023c3 | 1948 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1949 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 1950 | struct trace_entry *entry; |
bc0c38d1 SR |
1951 | unsigned long usec_rem; |
1952 | unsigned long long t; | |
1953 | unsigned long secs; | |
1954 | char *comm; | |
b3806b43 | 1955 | int ret; |
bac524d3 | 1956 | int S, T; |
86387f7e | 1957 | int i; |
bc0c38d1 | 1958 | |
4e3c3333 | 1959 | entry = iter->ent; |
dd0e545f SR |
1960 | |
1961 | if (entry->type == TRACE_CONT) | |
2c4f035f | 1962 | return TRACE_TYPE_HANDLED; |
dd0e545f | 1963 | |
a309720c SR |
1964 | test_cpu_buff_start(iter); |
1965 | ||
777e208d | 1966 | comm = trace_find_cmdline(iter->ent->pid); |
bc0c38d1 | 1967 | |
3928a8a2 | 1968 | t = ns2usecs(iter->ts); |
bc0c38d1 SR |
1969 | usec_rem = do_div(t, 1000000ULL); |
1970 | secs = (unsigned long)t; | |
1971 | ||
777e208d | 1972 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
f29c73fe | 1973 | if (!ret) |
2c4f035f | 1974 | return TRACE_TYPE_PARTIAL_LINE; |
a6168353 | 1975 | ret = trace_seq_printf(s, "[%03d] ", iter->cpu); |
f29c73fe | 1976 | if (!ret) |
2c4f035f | 1977 | return TRACE_TYPE_PARTIAL_LINE; |
f29c73fe IM |
1978 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); |
1979 | if (!ret) | |
2c4f035f | 1980 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 SR |
1981 | |
1982 | switch (entry->type) { | |
777e208d | 1983 | case TRACE_FN: { |
7104f300 SR |
1984 | struct ftrace_entry *field; |
1985 | ||
1986 | trace_assign_type(field, entry); | |
777e208d SR |
1987 | |
1988 | ret = seq_print_ip_sym(s, field->ip, sym_flags); | |
b3806b43 | 1989 | if (!ret) |
2c4f035f | 1990 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1991 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
777e208d | 1992 | field->parent_ip) { |
b3806b43 SR |
1993 | ret = trace_seq_printf(s, " <-"); |
1994 | if (!ret) | |
2c4f035f | 1995 | return TRACE_TYPE_PARTIAL_LINE; |
b3aa5577 SR |
1996 | ret = seq_print_ip_sym(s, |
1997 | field->parent_ip, | |
1998 | sym_flags); | |
b3806b43 | 1999 | if (!ret) |
2c4f035f | 2000 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 2001 | } |
b3806b43 SR |
2002 | ret = trace_seq_printf(s, "\n"); |
2003 | if (!ret) | |
2c4f035f | 2004 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 2005 | break; |
777e208d | 2006 | } |
bc0c38d1 | 2007 | case TRACE_CTX: |
777e208d | 2008 | case TRACE_WAKE: { |
7104f300 SR |
2009 | struct ctx_switch_entry *field; |
2010 | ||
2011 | trace_assign_type(field, entry); | |
777e208d | 2012 | |
3d9101e9 TG |
2013 | T = task_state_char(field->next_state); |
2014 | S = task_state_char(field->prev_state); | |
80b5e940 | 2015 | ret = trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c\n", |
777e208d SR |
2016 | field->prev_pid, |
2017 | field->prev_prio, | |
b3806b43 | 2018 | S, |
57422797 | 2019 | entry->type == TRACE_CTX ? "==>" : " +", |
777e208d SR |
2020 | field->next_cpu, |
2021 | field->next_pid, | |
2022 | field->next_prio, | |
bac524d3 | 2023 | T); |
b3806b43 | 2024 | if (!ret) |
2c4f035f | 2025 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 2026 | break; |
777e208d SR |
2027 | } |
2028 | case TRACE_SPECIAL: { | |
7104f300 SR |
2029 | struct special_entry *field; |
2030 | ||
2031 | trace_assign_type(field, entry); | |
777e208d | 2032 | |
88a4216c | 2033 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
2034 | field->arg1, |
2035 | field->arg2, | |
2036 | field->arg3); | |
f0a920d5 | 2037 | if (!ret) |
2c4f035f | 2038 | return TRACE_TYPE_PARTIAL_LINE; |
f0a920d5 | 2039 | break; |
777e208d SR |
2040 | } |
2041 | case TRACE_STACK: { | |
7104f300 SR |
2042 | struct stack_entry *field; |
2043 | ||
2044 | trace_assign_type(field, entry); | |
777e208d | 2045 | |
86387f7e IM |
2046 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
2047 | if (i) { | |
2048 | ret = trace_seq_puts(s, " <= "); | |
2049 | if (!ret) | |
2c4f035f | 2050 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e | 2051 | } |
777e208d | 2052 | ret = seq_print_ip_sym(s, field->caller[i], |
86387f7e IM |
2053 | sym_flags); |
2054 | if (!ret) | |
2c4f035f | 2055 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e IM |
2056 | } |
2057 | ret = trace_seq_puts(s, "\n"); | |
2058 | if (!ret) | |
2c4f035f | 2059 | return TRACE_TYPE_PARTIAL_LINE; |
86387f7e | 2060 | break; |
777e208d SR |
2061 | } |
2062 | case TRACE_PRINT: { | |
7104f300 SR |
2063 | struct print_entry *field; |
2064 | ||
2065 | trace_assign_type(field, entry); | |
777e208d SR |
2066 | |
2067 | seq_print_ip_sym(s, field->ip, sym_flags); | |
2068 | trace_seq_printf(s, ": %s", field->buf); | |
2069 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
2070 | trace_seq_print_cont(s, iter); |
2071 | break; | |
bc0c38d1 | 2072 | } |
287b6e68 FW |
2073 | case TRACE_GRAPH_RET: { |
2074 | return print_graph_function(iter); | |
2075 | } | |
2076 | case TRACE_GRAPH_ENT: { | |
fb52607a | 2077 | return print_graph_function(iter); |
15e6cb36 | 2078 | } |
9f029e83 SR |
2079 | case TRACE_BRANCH: { |
2080 | struct trace_branch *field; | |
52f232cb SR |
2081 | |
2082 | trace_assign_type(field, entry); | |
2083 | ||
2084 | trace_seq_printf(s, "[%s] %s:%s:%d\n", | |
68d119f0 | 2085 | field->correct ? " ok " : " MISS ", |
52f232cb SR |
2086 | field->func, |
2087 | field->file, | |
2088 | field->line); | |
2089 | break; | |
2090 | } | |
02b67518 TE |
2091 | case TRACE_USER_STACK: { |
2092 | struct userstack_entry *field; | |
2093 | ||
2094 | trace_assign_type(field, entry); | |
2095 | ||
2096 | ret = seq_print_userip_objs(field, s, sym_flags); | |
2097 | if (!ret) | |
2098 | return TRACE_TYPE_PARTIAL_LINE; | |
2099 | ret = trace_seq_putc(s, '\n'); | |
2100 | if (!ret) | |
2101 | return TRACE_TYPE_PARTIAL_LINE; | |
2102 | break; | |
2103 | } | |
777e208d | 2104 | } |
2c4f035f | 2105 | return TRACE_TYPE_HANDLED; |
bc0c38d1 SR |
2106 | } |
2107 | ||
2c4f035f | 2108 | static enum print_line_t print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 IM |
2109 | { |
2110 | struct trace_seq *s = &iter->seq; | |
2111 | struct trace_entry *entry; | |
2112 | int ret; | |
bac524d3 | 2113 | int S, T; |
f9896bf3 IM |
2114 | |
2115 | entry = iter->ent; | |
dd0e545f SR |
2116 | |
2117 | if (entry->type == TRACE_CONT) | |
2c4f035f | 2118 | return TRACE_TYPE_HANDLED; |
dd0e545f | 2119 | |
f9896bf3 | 2120 | ret = trace_seq_printf(s, "%d %d %llu ", |
777e208d | 2121 | entry->pid, iter->cpu, iter->ts); |
f9896bf3 | 2122 | if (!ret) |
2c4f035f | 2123 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 IM |
2124 | |
2125 | switch (entry->type) { | |
777e208d | 2126 | case TRACE_FN: { |
7104f300 SR |
2127 | struct ftrace_entry *field; |
2128 | ||
2129 | trace_assign_type(field, entry); | |
777e208d | 2130 | |
f9896bf3 | 2131 | ret = trace_seq_printf(s, "%x %x\n", |
777e208d SR |
2132 | field->ip, |
2133 | field->parent_ip); | |
f9896bf3 | 2134 | if (!ret) |
2c4f035f | 2135 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 | 2136 | break; |
777e208d | 2137 | } |
f9896bf3 | 2138 | case TRACE_CTX: |
777e208d | 2139 | case TRACE_WAKE: { |
7104f300 SR |
2140 | struct ctx_switch_entry *field; |
2141 | ||
2142 | trace_assign_type(field, entry); | |
777e208d | 2143 | |
3d9101e9 TG |
2144 | T = task_state_char(field->next_state); |
2145 | S = entry->type == TRACE_WAKE ? '+' : | |
2146 | task_state_char(field->prev_state); | |
80b5e940 | 2147 | ret = trace_seq_printf(s, "%d %d %c %d %d %d %c\n", |
777e208d SR |
2148 | field->prev_pid, |
2149 | field->prev_prio, | |
f9896bf3 | 2150 | S, |
777e208d SR |
2151 | field->next_cpu, |
2152 | field->next_pid, | |
2153 | field->next_prio, | |
bac524d3 | 2154 | T); |
f9896bf3 | 2155 | if (!ret) |
2c4f035f | 2156 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 | 2157 | break; |
777e208d | 2158 | } |
f0a920d5 | 2159 | case TRACE_SPECIAL: |
02b67518 | 2160 | case TRACE_USER_STACK: |
777e208d | 2161 | case TRACE_STACK: { |
7104f300 SR |
2162 | struct special_entry *field; |
2163 | ||
2164 | trace_assign_type(field, entry); | |
777e208d | 2165 | |
88a4216c | 2166 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
777e208d SR |
2167 | field->arg1, |
2168 | field->arg2, | |
2169 | field->arg3); | |
f0a920d5 | 2170 | if (!ret) |
2c4f035f | 2171 | return TRACE_TYPE_PARTIAL_LINE; |
f0a920d5 | 2172 | break; |
777e208d SR |
2173 | } |
2174 | case TRACE_PRINT: { | |
7104f300 SR |
2175 | struct print_entry *field; |
2176 | ||
2177 | trace_assign_type(field, entry); | |
777e208d SR |
2178 | |
2179 | trace_seq_printf(s, "# %lx %s", field->ip, field->buf); | |
2180 | if (entry->flags & TRACE_FLAG_CONT) | |
dd0e545f SR |
2181 | trace_seq_print_cont(s, iter); |
2182 | break; | |
f9896bf3 | 2183 | } |
777e208d | 2184 | } |
2c4f035f | 2185 | return TRACE_TYPE_HANDLED; |
f9896bf3 IM |
2186 | } |
2187 | ||
cb0f12aa IM |
2188 | #define SEQ_PUT_FIELD_RET(s, x) \ |
2189 | do { \ | |
2190 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ | |
2191 | return 0; \ | |
2192 | } while (0) | |
2193 | ||
5e3ca0ec IM |
2194 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
2195 | do { \ | |
ad0a3b68 | 2196 | BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES); \ |
5e3ca0ec IM |
2197 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ |
2198 | return 0; \ | |
2199 | } while (0) | |
2200 | ||
2c4f035f | 2201 | static enum print_line_t print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec IM |
2202 | { |
2203 | struct trace_seq *s = &iter->seq; | |
2204 | unsigned char newline = '\n'; | |
2205 | struct trace_entry *entry; | |
bac524d3 | 2206 | int S, T; |
5e3ca0ec IM |
2207 | |
2208 | entry = iter->ent; | |
dd0e545f SR |
2209 | |
2210 | if (entry->type == TRACE_CONT) | |
2c4f035f | 2211 | return TRACE_TYPE_HANDLED; |
dd0e545f | 2212 | |
777e208d | 2213 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); |
5e3ca0ec | 2214 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); |
3928a8a2 | 2215 | SEQ_PUT_HEX_FIELD_RET(s, iter->ts); |
5e3ca0ec IM |
2216 | |
2217 | switch (entry->type) { | |
777e208d | 2218 | case TRACE_FN: { |
7104f300 SR |
2219 | struct ftrace_entry *field; |
2220 | ||
2221 | trace_assign_type(field, entry); | |
777e208d SR |
2222 | |
2223 | SEQ_PUT_HEX_FIELD_RET(s, field->ip); | |
2224 | SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip); | |
5e3ca0ec | 2225 | break; |
777e208d | 2226 | } |
5e3ca0ec | 2227 | case TRACE_CTX: |
777e208d | 2228 | case TRACE_WAKE: { |
7104f300 SR |
2229 | struct ctx_switch_entry *field; |
2230 | ||
2231 | trace_assign_type(field, entry); | |
777e208d | 2232 | |
3d9101e9 TG |
2233 | T = task_state_char(field->next_state); |
2234 | S = entry->type == TRACE_WAKE ? '+' : | |
2235 | task_state_char(field->prev_state); | |
777e208d SR |
2236 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid); |
2237 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio); | |
5e3ca0ec | 2238 | SEQ_PUT_HEX_FIELD_RET(s, S); |
777e208d SR |
2239 | SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu); |
2240 | SEQ_PUT_HEX_FIELD_RET(s, field->next_pid); | |
2241 | SEQ_PUT_HEX_FIELD_RET(s, field->next_prio); | |
bac524d3 | 2242 | SEQ_PUT_HEX_FIELD_RET(s, T); |
5e3ca0ec | 2243 | break; |
777e208d | 2244 | } |
5e3ca0ec | 2245 | case TRACE_SPECIAL: |
02b67518 | 2246 | case TRACE_USER_STACK: |
777e208d | 2247 | case TRACE_STACK: { |
7104f300 SR |
2248 | struct special_entry *field; |
2249 | ||
2250 | trace_assign_type(field, entry); | |
777e208d SR |
2251 | |
2252 | SEQ_PUT_HEX_FIELD_RET(s, field->arg1); | |
2253 | SEQ_PUT_HEX_FIELD_RET(s, field->arg2); | |
2254 | SEQ_PUT_HEX_FIELD_RET(s, field->arg3); | |
5e3ca0ec IM |
2255 | break; |
2256 | } | |
777e208d | 2257 | } |
5e3ca0ec IM |
2258 | SEQ_PUT_FIELD_RET(s, newline); |
2259 | ||
2c4f035f | 2260 | return TRACE_TYPE_HANDLED; |
5e3ca0ec IM |
2261 | } |
2262 | ||
66896a85 FW |
2263 | static enum print_line_t print_printk_msg_only(struct trace_iterator *iter) |
2264 | { | |
2265 | struct trace_seq *s = &iter->seq; | |
2266 | struct trace_entry *entry = iter->ent; | |
2267 | struct print_entry *field; | |
2268 | int ret; | |
2269 | ||
2270 | trace_assign_type(field, entry); | |
2271 | ||
2272 | ret = trace_seq_printf(s, field->buf); | |
2273 | if (!ret) | |
2274 | return TRACE_TYPE_PARTIAL_LINE; | |
2275 | ||
2276 | if (entry->flags & TRACE_FLAG_CONT) | |
2277 | trace_seq_print_cont(s, iter); | |
2278 | ||
2279 | return TRACE_TYPE_HANDLED; | |
2280 | } | |
2281 | ||
2c4f035f | 2282 | static enum print_line_t print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa IM |
2283 | { |
2284 | struct trace_seq *s = &iter->seq; | |
2285 | struct trace_entry *entry; | |
2286 | ||
2287 | entry = iter->ent; | |
dd0e545f SR |
2288 | |
2289 | if (entry->type == TRACE_CONT) | |
2c4f035f | 2290 | return TRACE_TYPE_HANDLED; |
dd0e545f | 2291 | |
777e208d | 2292 | SEQ_PUT_FIELD_RET(s, entry->pid); |
072ba498 | 2293 | SEQ_PUT_FIELD_RET(s, entry->cpu); |
3928a8a2 | 2294 | SEQ_PUT_FIELD_RET(s, iter->ts); |
cb0f12aa IM |
2295 | |
2296 | switch (entry->type) { | |
777e208d | 2297 | case TRACE_FN: { |
7104f300 SR |
2298 | struct ftrace_entry *field; |
2299 | ||
2300 | trace_assign_type(field, entry); | |
777e208d SR |
2301 | |
2302 | SEQ_PUT_FIELD_RET(s, field->ip); | |
2303 | SEQ_PUT_FIELD_RET(s, field->parent_ip); | |
cb0f12aa | 2304 | break; |
777e208d SR |
2305 | } |
2306 | case TRACE_CTX: { | |
7104f300 SR |
2307 | struct ctx_switch_entry *field; |
2308 | ||
2309 | trace_assign_type(field, entry); | |
777e208d SR |
2310 | |
2311 | SEQ_PUT_FIELD_RET(s, field->prev_pid); | |
2312 | SEQ_PUT_FIELD_RET(s, field->prev_prio); | |
2313 | SEQ_PUT_FIELD_RET(s, field->prev_state); | |
2314 | SEQ_PUT_FIELD_RET(s, field->next_pid); | |
2315 | SEQ_PUT_FIELD_RET(s, field->next_prio); | |
2316 | SEQ_PUT_FIELD_RET(s, field->next_state); | |
cb0f12aa | 2317 | break; |
777e208d | 2318 | } |
f0a920d5 | 2319 | case TRACE_SPECIAL: |
02b67518 | 2320 | case TRACE_USER_STACK: |
777e208d | 2321 | case TRACE_STACK: { |
7104f300 SR |
2322 | struct special_entry *field; |
2323 | ||
2324 | trace_assign_type(field, entry); | |
777e208d SR |
2325 | |
2326 | SEQ_PUT_FIELD_RET(s, field->arg1); | |
2327 | SEQ_PUT_FIELD_RET(s, field->arg2); | |
2328 | SEQ_PUT_FIELD_RET(s, field->arg3); | |
f0a920d5 | 2329 | break; |
cb0f12aa | 2330 | } |
777e208d | 2331 | } |
cb0f12aa IM |
2332 | return 1; |
2333 | } | |
2334 | ||
bc0c38d1 SR |
2335 | static int trace_empty(struct trace_iterator *iter) |
2336 | { | |
bc0c38d1 SR |
2337 | int cpu; |
2338 | ||
ab46428c | 2339 | for_each_tracing_cpu(cpu) { |
d769041f SR |
2340 | if (iter->buffer_iter[cpu]) { |
2341 | if (!ring_buffer_iter_empty(iter->buffer_iter[cpu])) | |
2342 | return 0; | |
2343 | } else { | |
2344 | if (!ring_buffer_empty_cpu(iter->tr->buffer, cpu)) | |
2345 | return 0; | |
2346 | } | |
bc0c38d1 | 2347 | } |
d769041f | 2348 | |
797d3712 | 2349 | return 1; |
bc0c38d1 SR |
2350 | } |
2351 | ||
2c4f035f | 2352 | static enum print_line_t print_trace_line(struct trace_iterator *iter) |
f9896bf3 | 2353 | { |
2c4f035f FW |
2354 | enum print_line_t ret; |
2355 | ||
2356 | if (iter->trace && iter->trace->print_line) { | |
2357 | ret = iter->trace->print_line(iter); | |
2358 | if (ret != TRACE_TYPE_UNHANDLED) | |
2359 | return ret; | |
2360 | } | |
72829bc3 | 2361 | |
66896a85 FW |
2362 | if (iter->ent->type == TRACE_PRINT && |
2363 | trace_flags & TRACE_ITER_PRINTK && | |
2364 | trace_flags & TRACE_ITER_PRINTK_MSGONLY) | |
2365 | return print_printk_msg_only(iter); | |
2366 | ||
cb0f12aa IM |
2367 | if (trace_flags & TRACE_ITER_BIN) |
2368 | return print_bin_fmt(iter); | |
2369 | ||
5e3ca0ec IM |
2370 | if (trace_flags & TRACE_ITER_HEX) |
2371 | return print_hex_fmt(iter); | |
2372 | ||
f9896bf3 IM |
2373 | if (trace_flags & TRACE_ITER_RAW) |
2374 | return print_raw_fmt(iter); | |
2375 | ||
2376 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
2377 | return print_lat_fmt(iter, iter->idx, iter->cpu); | |
2378 | ||
2379 | return print_trace_fmt(iter); | |
2380 | } | |
2381 | ||
bc0c38d1 SR |
2382 | static int s_show(struct seq_file *m, void *v) |
2383 | { | |
2384 | struct trace_iterator *iter = v; | |
2385 | ||
2386 | if (iter->ent == NULL) { | |
2387 | if (iter->tr) { | |
2388 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
2389 | seq_puts(m, "#\n"); | |
2390 | } | |
8bba1bf5 MM |
2391 | if (iter->trace && iter->trace->print_header) |
2392 | iter->trace->print_header(m); | |
2393 | else if (iter->iter_flags & TRACE_FILE_LAT_FMT) { | |
bc0c38d1 SR |
2394 | /* print nothing if the buffers are empty */ |
2395 | if (trace_empty(iter)) | |
2396 | return 0; | |
2397 | print_trace_header(m, iter); | |
2398 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
2399 | print_lat_help_header(m); | |
2400 | } else { | |
2401 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
2402 | print_func_help_header(m); | |
2403 | } | |
2404 | } else { | |
f9896bf3 | 2405 | print_trace_line(iter); |
214023c3 | 2406 | trace_print_seq(m, &iter->seq); |
bc0c38d1 SR |
2407 | } |
2408 | ||
2409 | return 0; | |
2410 | } | |
2411 | ||
2412 | static struct seq_operations tracer_seq_ops = { | |
4bf39a94 IM |
2413 | .start = s_start, |
2414 | .next = s_next, | |
2415 | .stop = s_stop, | |
2416 | .show = s_show, | |
bc0c38d1 SR |
2417 | }; |
2418 | ||
e309b41d | 2419 | static struct trace_iterator * |
bc0c38d1 SR |
2420 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
2421 | { | |
2422 | struct trace_iterator *iter; | |
3928a8a2 SR |
2423 | struct seq_file *m; |
2424 | int cpu; | |
bc0c38d1 | 2425 | |
60a11774 SR |
2426 | if (tracing_disabled) { |
2427 | *ret = -ENODEV; | |
2428 | return NULL; | |
2429 | } | |
2430 | ||
bc0c38d1 SR |
2431 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
2432 | if (!iter) { | |
2433 | *ret = -ENOMEM; | |
2434 | goto out; | |
2435 | } | |
2436 | ||
2437 | mutex_lock(&trace_types_lock); | |
2438 | if (current_trace && current_trace->print_max) | |
2439 | iter->tr = &max_tr; | |
2440 | else | |
2441 | iter->tr = inode->i_private; | |
2442 | iter->trace = current_trace; | |
2443 | iter->pos = -1; | |
2444 | ||
8bba1bf5 MM |
2445 | /* Notify the tracer early; before we stop tracing. */ |
2446 | if (iter->trace && iter->trace->open) | |
a93751ca | 2447 | iter->trace->open(iter); |
8bba1bf5 | 2448 | |
12ef7d44 SR |
2449 | /* Annotate start of buffers if we had overruns */ |
2450 | if (ring_buffer_overruns(iter->tr->buffer)) | |
2451 | iter->iter_flags |= TRACE_FILE_ANNOTATE; | |
2452 | ||
2453 | ||
3928a8a2 | 2454 | for_each_tracing_cpu(cpu) { |
d769041f | 2455 | |
3928a8a2 SR |
2456 | iter->buffer_iter[cpu] = |
2457 | ring_buffer_read_start(iter->tr->buffer, cpu); | |
d769041f | 2458 | |
3928a8a2 SR |
2459 | if (!iter->buffer_iter[cpu]) |
2460 | goto fail_buffer; | |
2461 | } | |
2462 | ||
bc0c38d1 SR |
2463 | /* TODO stop tracer */ |
2464 | *ret = seq_open(file, &tracer_seq_ops); | |
3928a8a2 SR |
2465 | if (*ret) |
2466 | goto fail_buffer; | |
bc0c38d1 | 2467 | |
3928a8a2 SR |
2468 | m = file->private_data; |
2469 | m->private = iter; | |
bc0c38d1 | 2470 | |
3928a8a2 | 2471 | /* stop the trace while dumping */ |
9036990d | 2472 | tracing_stop(); |
3928a8a2 | 2473 | |
bc0c38d1 SR |
2474 | mutex_unlock(&trace_types_lock); |
2475 | ||
2476 | out: | |
2477 | return iter; | |
3928a8a2 SR |
2478 | |
2479 | fail_buffer: | |
2480 | for_each_tracing_cpu(cpu) { | |
2481 | if (iter->buffer_iter[cpu]) | |
2482 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
2483 | } | |
2484 | mutex_unlock(&trace_types_lock); | |
0bb943c7 | 2485 | kfree(iter); |
3928a8a2 SR |
2486 | |
2487 | return ERR_PTR(-ENOMEM); | |
bc0c38d1 SR |
2488 | } |
2489 | ||
2490 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
2491 | { | |
60a11774 SR |
2492 | if (tracing_disabled) |
2493 | return -ENODEV; | |
2494 | ||
bc0c38d1 SR |
2495 | filp->private_data = inode->i_private; |
2496 | return 0; | |
2497 | } | |
2498 | ||
2499 | int tracing_release(struct inode *inode, struct file *file) | |
2500 | { | |
2501 | struct seq_file *m = (struct seq_file *)file->private_data; | |
2502 | struct trace_iterator *iter = m->private; | |
3928a8a2 | 2503 | int cpu; |
bc0c38d1 SR |
2504 | |
2505 | mutex_lock(&trace_types_lock); | |
3928a8a2 SR |
2506 | for_each_tracing_cpu(cpu) { |
2507 | if (iter->buffer_iter[cpu]) | |
2508 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
2509 | } | |
2510 | ||
bc0c38d1 SR |
2511 | if (iter->trace && iter->trace->close) |
2512 | iter->trace->close(iter); | |
2513 | ||
2514 | /* reenable tracing if it was previously enabled */ | |
9036990d | 2515 | tracing_start(); |
bc0c38d1 SR |
2516 | mutex_unlock(&trace_types_lock); |
2517 | ||
2518 | seq_release(inode, file); | |
2519 | kfree(iter); | |
2520 | return 0; | |
2521 | } | |
2522 | ||
2523 | static int tracing_open(struct inode *inode, struct file *file) | |
2524 | { | |
2525 | int ret; | |
2526 | ||
2527 | __tracing_open(inode, file, &ret); | |
2528 | ||
2529 | return ret; | |
2530 | } | |
2531 | ||
2532 | static int tracing_lt_open(struct inode *inode, struct file *file) | |
2533 | { | |
2534 | struct trace_iterator *iter; | |
2535 | int ret; | |
2536 | ||
2537 | iter = __tracing_open(inode, file, &ret); | |
2538 | ||
2539 | if (!ret) | |
2540 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
2541 | ||
2542 | return ret; | |
2543 | } | |
2544 | ||
2545 | ||
e309b41d | 2546 | static void * |
bc0c38d1 SR |
2547 | t_next(struct seq_file *m, void *v, loff_t *pos) |
2548 | { | |
2549 | struct tracer *t = m->private; | |
2550 | ||
2551 | (*pos)++; | |
2552 | ||
2553 | if (t) | |
2554 | t = t->next; | |
2555 | ||
2556 | m->private = t; | |
2557 | ||
2558 | return t; | |
2559 | } | |
2560 | ||
2561 | static void *t_start(struct seq_file *m, loff_t *pos) | |
2562 | { | |
2563 | struct tracer *t = m->private; | |
2564 | loff_t l = 0; | |
2565 | ||
2566 | mutex_lock(&trace_types_lock); | |
2567 | for (; t && l < *pos; t = t_next(m, t, &l)) | |
2568 | ; | |
2569 | ||
2570 | return t; | |
2571 | } | |
2572 | ||
2573 | static void t_stop(struct seq_file *m, void *p) | |
2574 | { | |
2575 | mutex_unlock(&trace_types_lock); | |
2576 | } | |
2577 | ||
2578 | static int t_show(struct seq_file *m, void *v) | |
2579 | { | |
2580 | struct tracer *t = v; | |
2581 | ||
2582 | if (!t) | |
2583 | return 0; | |
2584 | ||
2585 | seq_printf(m, "%s", t->name); | |
2586 | if (t->next) | |
2587 | seq_putc(m, ' '); | |
2588 | else | |
2589 | seq_putc(m, '\n'); | |
2590 | ||
2591 | return 0; | |
2592 | } | |
2593 | ||
2594 | static struct seq_operations show_traces_seq_ops = { | |
4bf39a94 IM |
2595 | .start = t_start, |
2596 | .next = t_next, | |
2597 | .stop = t_stop, | |
2598 | .show = t_show, | |
bc0c38d1 SR |
2599 | }; |
2600 | ||
2601 | static int show_traces_open(struct inode *inode, struct file *file) | |
2602 | { | |
2603 | int ret; | |
2604 | ||
60a11774 SR |
2605 | if (tracing_disabled) |
2606 | return -ENODEV; | |
2607 | ||
bc0c38d1 SR |
2608 | ret = seq_open(file, &show_traces_seq_ops); |
2609 | if (!ret) { | |
2610 | struct seq_file *m = file->private_data; | |
2611 | m->private = trace_types; | |
2612 | } | |
2613 | ||
2614 | return ret; | |
2615 | } | |
2616 | ||
2617 | static struct file_operations tracing_fops = { | |
4bf39a94 IM |
2618 | .open = tracing_open, |
2619 | .read = seq_read, | |
2620 | .llseek = seq_lseek, | |
2621 | .release = tracing_release, | |
bc0c38d1 SR |
2622 | }; |
2623 | ||
2624 | static struct file_operations tracing_lt_fops = { | |
4bf39a94 IM |
2625 | .open = tracing_lt_open, |
2626 | .read = seq_read, | |
2627 | .llseek = seq_lseek, | |
2628 | .release = tracing_release, | |
bc0c38d1 SR |
2629 | }; |
2630 | ||
2631 | static struct file_operations show_traces_fops = { | |
c7078de1 IM |
2632 | .open = show_traces_open, |
2633 | .read = seq_read, | |
2634 | .release = seq_release, | |
2635 | }; | |
2636 | ||
36dfe925 IM |
2637 | /* |
2638 | * Only trace on a CPU if the bitmask is set: | |
2639 | */ | |
2640 | static cpumask_t tracing_cpumask = CPU_MASK_ALL; | |
2641 | ||
2642 | /* | |
2643 | * When tracing/tracing_cpu_mask is modified then this holds | |
2644 | * the new bitmask we are about to install: | |
2645 | */ | |
2646 | static cpumask_t tracing_cpumask_new; | |
2647 | ||
2648 | /* | |
2649 | * The tracer itself will not take this lock, but still we want | |
2650 | * to provide a consistent cpumask to user-space: | |
2651 | */ | |
2652 | static DEFINE_MUTEX(tracing_cpumask_update_lock); | |
2653 | ||
2654 | /* | |
2655 | * Temporary storage for the character representation of the | |
2656 | * CPU bitmask (and one more byte for the newline): | |
2657 | */ | |
2658 | static char mask_str[NR_CPUS + 1]; | |
2659 | ||
c7078de1 IM |
2660 | static ssize_t |
2661 | tracing_cpumask_read(struct file *filp, char __user *ubuf, | |
2662 | size_t count, loff_t *ppos) | |
2663 | { | |
36dfe925 | 2664 | int len; |
c7078de1 IM |
2665 | |
2666 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 IM |
2667 | |
2668 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); | |
2669 | if (count - len < 2) { | |
2670 | count = -EINVAL; | |
2671 | goto out_err; | |
2672 | } | |
2673 | len += sprintf(mask_str + len, "\n"); | |
2674 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); | |
2675 | ||
2676 | out_err: | |
c7078de1 IM |
2677 | mutex_unlock(&tracing_cpumask_update_lock); |
2678 | ||
2679 | return count; | |
2680 | } | |
2681 | ||
2682 | static ssize_t | |
2683 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, | |
2684 | size_t count, loff_t *ppos) | |
2685 | { | |
36dfe925 | 2686 | int err, cpu; |
c7078de1 IM |
2687 | |
2688 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 | 2689 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
c7078de1 | 2690 | if (err) |
36dfe925 IM |
2691 | goto err_unlock; |
2692 | ||
a5e25883 | 2693 | local_irq_disable(); |
92205c23 | 2694 | __raw_spin_lock(&ftrace_max_lock); |
ab46428c | 2695 | for_each_tracing_cpu(cpu) { |
36dfe925 IM |
2696 | /* |
2697 | * Increase/decrease the disabled counter if we are | |
2698 | * about to flip a bit in the cpumask: | |
2699 | */ | |
2700 | if (cpu_isset(cpu, tracing_cpumask) && | |
2701 | !cpu_isset(cpu, tracing_cpumask_new)) { | |
2702 | atomic_inc(&global_trace.data[cpu]->disabled); | |
2703 | } | |
2704 | if (!cpu_isset(cpu, tracing_cpumask) && | |
2705 | cpu_isset(cpu, tracing_cpumask_new)) { | |
2706 | atomic_dec(&global_trace.data[cpu]->disabled); | |
2707 | } | |
2708 | } | |
92205c23 | 2709 | __raw_spin_unlock(&ftrace_max_lock); |
a5e25883 | 2710 | local_irq_enable(); |
36dfe925 IM |
2711 | |
2712 | tracing_cpumask = tracing_cpumask_new; | |
2713 | ||
2714 | mutex_unlock(&tracing_cpumask_update_lock); | |
c7078de1 IM |
2715 | |
2716 | return count; | |
36dfe925 IM |
2717 | |
2718 | err_unlock: | |
2719 | mutex_unlock(&tracing_cpumask_update_lock); | |
2720 | ||
2721 | return err; | |
c7078de1 IM |
2722 | } |
2723 | ||
2724 | static struct file_operations tracing_cpumask_fops = { | |
2725 | .open = tracing_open_generic, | |
2726 | .read = tracing_cpumask_read, | |
2727 | .write = tracing_cpumask_write, | |
bc0c38d1 SR |
2728 | }; |
2729 | ||
2730 | static ssize_t | |
ee6bce52 | 2731 | tracing_trace_options_read(struct file *filp, char __user *ubuf, |
bc0c38d1 SR |
2732 | size_t cnt, loff_t *ppos) |
2733 | { | |
adf9f195 | 2734 | int i; |
bc0c38d1 SR |
2735 | char *buf; |
2736 | int r = 0; | |
2737 | int len = 0; | |
adf9f195 FW |
2738 | u32 tracer_flags = current_trace->flags->val; |
2739 | struct tracer_opt *trace_opts = current_trace->flags->opts; | |
2740 | ||
bc0c38d1 SR |
2741 | |
2742 | /* calulate max size */ | |
2743 | for (i = 0; trace_options[i]; i++) { | |
2744 | len += strlen(trace_options[i]); | |
2745 | len += 3; /* "no" and space */ | |
2746 | } | |
2747 | ||
adf9f195 FW |
2748 | /* |
2749 | * Increase the size with names of options specific | |
2750 | * of the current tracer. | |
2751 | */ | |
2752 | for (i = 0; trace_opts[i].name; i++) { | |
2753 | len += strlen(trace_opts[i].name); | |
2754 | len += 3; /* "no" and space */ | |
2755 | } | |
2756 | ||
bc0c38d1 SR |
2757 | /* +2 for \n and \0 */ |
2758 | buf = kmalloc(len + 2, GFP_KERNEL); | |
2759 | if (!buf) | |
2760 | return -ENOMEM; | |
2761 | ||
2762 | for (i = 0; trace_options[i]; i++) { | |
2763 | if (trace_flags & (1 << i)) | |
2764 | r += sprintf(buf + r, "%s ", trace_options[i]); | |
2765 | else | |
2766 | r += sprintf(buf + r, "no%s ", trace_options[i]); | |
2767 | } | |
2768 | ||
adf9f195 FW |
2769 | for (i = 0; trace_opts[i].name; i++) { |
2770 | if (tracer_flags & trace_opts[i].bit) | |
2771 | r += sprintf(buf + r, "%s ", | |
2772 | trace_opts[i].name); | |
2773 | else | |
2774 | r += sprintf(buf + r, "no%s ", | |
2775 | trace_opts[i].name); | |
2776 | } | |
2777 | ||
bc0c38d1 SR |
2778 | r += sprintf(buf + r, "\n"); |
2779 | WARN_ON(r >= len + 2); | |
2780 | ||
36dfe925 | 2781 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2782 | |
2783 | kfree(buf); | |
2784 | ||
2785 | return r; | |
2786 | } | |
2787 | ||
adf9f195 FW |
2788 | /* Try to assign a tracer specific option */ |
2789 | static int set_tracer_option(struct tracer *trace, char *cmp, int neg) | |
2790 | { | |
2791 | struct tracer_flags *trace_flags = trace->flags; | |
2792 | struct tracer_opt *opts = NULL; | |
2793 | int ret = 0, i = 0; | |
2794 | int len; | |
2795 | ||
2796 | for (i = 0; trace_flags->opts[i].name; i++) { | |
2797 | opts = &trace_flags->opts[i]; | |
2798 | len = strlen(opts->name); | |
2799 | ||
2800 | if (strncmp(cmp, opts->name, len) == 0) { | |
2801 | ret = trace->set_flag(trace_flags->val, | |
2802 | opts->bit, !neg); | |
2803 | break; | |
2804 | } | |
2805 | } | |
2806 | /* Not found */ | |
2807 | if (!trace_flags->opts[i].name) | |
2808 | return -EINVAL; | |
2809 | ||
2810 | /* Refused to handle */ | |
2811 | if (ret) | |
2812 | return ret; | |
2813 | ||
2814 | if (neg) | |
2815 | trace_flags->val &= ~opts->bit; | |
2816 | else | |
2817 | trace_flags->val |= opts->bit; | |
2818 | ||
2819 | return 0; | |
2820 | } | |
2821 | ||
bc0c38d1 | 2822 | static ssize_t |
ee6bce52 | 2823 | tracing_trace_options_write(struct file *filp, const char __user *ubuf, |
bc0c38d1 SR |
2824 | size_t cnt, loff_t *ppos) |
2825 | { | |
2826 | char buf[64]; | |
2827 | char *cmp = buf; | |
2828 | int neg = 0; | |
adf9f195 | 2829 | int ret; |
bc0c38d1 SR |
2830 | int i; |
2831 | ||
cffae437 SR |
2832 | if (cnt >= sizeof(buf)) |
2833 | return -EINVAL; | |
bc0c38d1 SR |
2834 | |
2835 | if (copy_from_user(&buf, ubuf, cnt)) | |
2836 | return -EFAULT; | |
2837 | ||
2838 | buf[cnt] = 0; | |
2839 | ||
2840 | if (strncmp(buf, "no", 2) == 0) { | |
2841 | neg = 1; | |
2842 | cmp += 2; | |
2843 | } | |
2844 | ||
2845 | for (i = 0; trace_options[i]; i++) { | |
2846 | int len = strlen(trace_options[i]); | |
2847 | ||
2848 | if (strncmp(cmp, trace_options[i], len) == 0) { | |
2849 | if (neg) | |
2850 | trace_flags &= ~(1 << i); | |
2851 | else | |
2852 | trace_flags |= (1 << i); | |
2853 | break; | |
2854 | } | |
2855 | } | |
adf9f195 FW |
2856 | |
2857 | /* If no option could be set, test the specific tracer options */ | |
2858 | if (!trace_options[i]) { | |
2859 | ret = set_tracer_option(current_trace, cmp, neg); | |
2860 | if (ret) | |
2861 | return ret; | |
2862 | } | |
bc0c38d1 SR |
2863 | |
2864 | filp->f_pos += cnt; | |
2865 | ||
2866 | return cnt; | |
2867 | } | |
2868 | ||
2869 | static struct file_operations tracing_iter_fops = { | |
c7078de1 | 2870 | .open = tracing_open_generic, |
ee6bce52 SR |
2871 | .read = tracing_trace_options_read, |
2872 | .write = tracing_trace_options_write, | |
bc0c38d1 SR |
2873 | }; |
2874 | ||
7bd2f24c IM |
2875 | static const char readme_msg[] = |
2876 | "tracing mini-HOWTO:\n\n" | |
2877 | "# mkdir /debug\n" | |
2878 | "# mount -t debugfs nodev /debug\n\n" | |
2879 | "# cat /debug/tracing/available_tracers\n" | |
2880 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" | |
2881 | "# cat /debug/tracing/current_tracer\n" | |
2882 | "none\n" | |
2883 | "# echo sched_switch > /debug/tracing/current_tracer\n" | |
2884 | "# cat /debug/tracing/current_tracer\n" | |
2885 | "sched_switch\n" | |
ee6bce52 | 2886 | "# cat /debug/tracing/trace_options\n" |
7bd2f24c | 2887 | "noprint-parent nosym-offset nosym-addr noverbose\n" |
ee6bce52 | 2888 | "# echo print-parent > /debug/tracing/trace_options\n" |
7bd2f24c IM |
2889 | "# echo 1 > /debug/tracing/tracing_enabled\n" |
2890 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" | |
2891 | "echo 0 > /debug/tracing/tracing_enabled\n" | |
2892 | ; | |
2893 | ||
2894 | static ssize_t | |
2895 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
2896 | size_t cnt, loff_t *ppos) | |
2897 | { | |
2898 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
2899 | readme_msg, strlen(readme_msg)); | |
2900 | } | |
2901 | ||
2902 | static struct file_operations tracing_readme_fops = { | |
c7078de1 IM |
2903 | .open = tracing_open_generic, |
2904 | .read = tracing_readme_read, | |
7bd2f24c IM |
2905 | }; |
2906 | ||
bc0c38d1 SR |
2907 | static ssize_t |
2908 | tracing_ctrl_read(struct file *filp, char __user *ubuf, | |
2909 | size_t cnt, loff_t *ppos) | |
2910 | { | |
bc0c38d1 SR |
2911 | char buf[64]; |
2912 | int r; | |
2913 | ||
9036990d | 2914 | r = sprintf(buf, "%u\n", tracer_enabled); |
4e3c3333 | 2915 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2916 | } |
2917 | ||
2918 | static ssize_t | |
2919 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, | |
2920 | size_t cnt, loff_t *ppos) | |
2921 | { | |
2922 | struct trace_array *tr = filp->private_data; | |
bc0c38d1 | 2923 | char buf[64]; |
c6caeeb1 SR |
2924 | long val; |
2925 | int ret; | |
bc0c38d1 | 2926 | |
cffae437 SR |
2927 | if (cnt >= sizeof(buf)) |
2928 | return -EINVAL; | |
bc0c38d1 SR |
2929 | |
2930 | if (copy_from_user(&buf, ubuf, cnt)) | |
2931 | return -EFAULT; | |
2932 | ||
2933 | buf[cnt] = 0; | |
2934 | ||
c6caeeb1 SR |
2935 | ret = strict_strtoul(buf, 10, &val); |
2936 | if (ret < 0) | |
2937 | return ret; | |
bc0c38d1 SR |
2938 | |
2939 | val = !!val; | |
2940 | ||
2941 | mutex_lock(&trace_types_lock); | |
9036990d SR |
2942 | if (tracer_enabled ^ val) { |
2943 | if (val) { | |
bc0c38d1 | 2944 | tracer_enabled = 1; |
9036990d SR |
2945 | if (current_trace->start) |
2946 | current_trace->start(tr); | |
2947 | tracing_start(); | |
2948 | } else { | |
bc0c38d1 | 2949 | tracer_enabled = 0; |
9036990d SR |
2950 | tracing_stop(); |
2951 | if (current_trace->stop) | |
2952 | current_trace->stop(tr); | |
2953 | } | |
bc0c38d1 SR |
2954 | } |
2955 | mutex_unlock(&trace_types_lock); | |
2956 | ||
2957 | filp->f_pos += cnt; | |
2958 | ||
2959 | return cnt; | |
2960 | } | |
2961 | ||
2962 | static ssize_t | |
2963 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
2964 | size_t cnt, loff_t *ppos) | |
2965 | { | |
2966 | char buf[max_tracer_type_len+2]; | |
2967 | int r; | |
2968 | ||
2969 | mutex_lock(&trace_types_lock); | |
2970 | if (current_trace) | |
2971 | r = sprintf(buf, "%s\n", current_trace->name); | |
2972 | else | |
2973 | r = sprintf(buf, "\n"); | |
2974 | mutex_unlock(&trace_types_lock); | |
2975 | ||
4bf39a94 | 2976 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2977 | } |
2978 | ||
d9e54076 | 2979 | static int tracing_set_tracer(char *buf) |
bc0c38d1 SR |
2980 | { |
2981 | struct trace_array *tr = &global_trace; | |
2982 | struct tracer *t; | |
d9e54076 | 2983 | int ret = 0; |
bc0c38d1 SR |
2984 | |
2985 | mutex_lock(&trace_types_lock); | |
2986 | for (t = trace_types; t; t = t->next) { | |
2987 | if (strcmp(t->name, buf) == 0) | |
2988 | break; | |
2989 | } | |
c2931e05 FW |
2990 | if (!t) { |
2991 | ret = -EINVAL; | |
2992 | goto out; | |
2993 | } | |
2994 | if (t == current_trace) | |
bc0c38d1 SR |
2995 | goto out; |
2996 | ||
9f029e83 | 2997 | trace_branch_disable(); |
bc0c38d1 SR |
2998 | if (current_trace && current_trace->reset) |
2999 | current_trace->reset(tr); | |
3000 | ||
3001 | current_trace = t; | |
1c80025a FW |
3002 | if (t->init) { |
3003 | ret = t->init(tr); | |
3004 | if (ret) | |
3005 | goto out; | |
3006 | } | |
bc0c38d1 | 3007 | |
9f029e83 | 3008 | trace_branch_enable(tr); |
bc0c38d1 SR |
3009 | out: |
3010 | mutex_unlock(&trace_types_lock); | |
3011 | ||
d9e54076 PZ |
3012 | return ret; |
3013 | } | |
3014 | ||
3015 | static ssize_t | |
3016 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
3017 | size_t cnt, loff_t *ppos) | |
3018 | { | |
3019 | char buf[max_tracer_type_len+1]; | |
3020 | int i; | |
3021 | size_t ret; | |
e6e7a65a FW |
3022 | int err; |
3023 | ||
3024 | ret = cnt; | |
d9e54076 PZ |
3025 | |
3026 | if (cnt > max_tracer_type_len) | |
3027 | cnt = max_tracer_type_len; | |
3028 | ||
3029 | if (copy_from_user(&buf, ubuf, cnt)) | |
3030 | return -EFAULT; | |
3031 | ||
3032 | buf[cnt] = 0; | |
3033 | ||
3034 | /* strip ending whitespace. */ | |
3035 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
3036 | buf[i] = 0; | |
3037 | ||
e6e7a65a FW |
3038 | err = tracing_set_tracer(buf); |
3039 | if (err) | |
3040 | return err; | |
d9e54076 | 3041 | |
e6e7a65a | 3042 | filp->f_pos += ret; |
bc0c38d1 | 3043 | |
c2931e05 | 3044 | return ret; |
bc0c38d1 SR |
3045 | } |
3046 | ||
3047 | static ssize_t | |
3048 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
3049 | size_t cnt, loff_t *ppos) | |
3050 | { | |
3051 | unsigned long *ptr = filp->private_data; | |
3052 | char buf[64]; | |
3053 | int r; | |
3054 | ||
cffae437 | 3055 | r = snprintf(buf, sizeof(buf), "%ld\n", |
bc0c38d1 | 3056 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
cffae437 SR |
3057 | if (r > sizeof(buf)) |
3058 | r = sizeof(buf); | |
4bf39a94 | 3059 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
3060 | } |
3061 | ||
3062 | static ssize_t | |
3063 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
3064 | size_t cnt, loff_t *ppos) | |
3065 | { | |
3066 | long *ptr = filp->private_data; | |
bc0c38d1 | 3067 | char buf[64]; |
c6caeeb1 SR |
3068 | long val; |
3069 | int ret; | |
bc0c38d1 | 3070 | |
cffae437 SR |
3071 | if (cnt >= sizeof(buf)) |
3072 | return -EINVAL; | |
bc0c38d1 SR |
3073 | |
3074 | if (copy_from_user(&buf, ubuf, cnt)) | |
3075 | return -EFAULT; | |
3076 | ||
3077 | buf[cnt] = 0; | |
3078 | ||
c6caeeb1 SR |
3079 | ret = strict_strtoul(buf, 10, &val); |
3080 | if (ret < 0) | |
3081 | return ret; | |
bc0c38d1 SR |
3082 | |
3083 | *ptr = val * 1000; | |
3084 | ||
3085 | return cnt; | |
3086 | } | |
3087 | ||
b3806b43 SR |
3088 | static atomic_t tracing_reader; |
3089 | ||
3090 | static int tracing_open_pipe(struct inode *inode, struct file *filp) | |
3091 | { | |
3092 | struct trace_iterator *iter; | |
3093 | ||
3094 | if (tracing_disabled) | |
3095 | return -ENODEV; | |
3096 | ||
3097 | /* We only allow for reader of the pipe */ | |
3098 | if (atomic_inc_return(&tracing_reader) != 1) { | |
3099 | atomic_dec(&tracing_reader); | |
3100 | return -EBUSY; | |
3101 | } | |
3102 | ||
3103 | /* create a buffer to store the information to pass to userspace */ | |
3104 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
3105 | if (!iter) | |
3106 | return -ENOMEM; | |
3107 | ||
107bad8b | 3108 | mutex_lock(&trace_types_lock); |
a309720c SR |
3109 | |
3110 | /* trace pipe does not show start of buffer */ | |
3111 | cpus_setall(iter->started); | |
3112 | ||
b3806b43 | 3113 | iter->tr = &global_trace; |
72829bc3 | 3114 | iter->trace = current_trace; |
b3806b43 SR |
3115 | filp->private_data = iter; |
3116 | ||
107bad8b SR |
3117 | if (iter->trace->pipe_open) |
3118 | iter->trace->pipe_open(iter); | |
3119 | mutex_unlock(&trace_types_lock); | |
3120 | ||
b3806b43 SR |
3121 | return 0; |
3122 | } | |
3123 | ||
3124 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
3125 | { | |
3126 | struct trace_iterator *iter = file->private_data; | |
3127 | ||
3128 | kfree(iter); | |
3129 | atomic_dec(&tracing_reader); | |
3130 | ||
3131 | return 0; | |
3132 | } | |
3133 | ||
2a2cc8f7 SSP |
3134 | static unsigned int |
3135 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) | |
3136 | { | |
3137 | struct trace_iterator *iter = filp->private_data; | |
3138 | ||
3139 | if (trace_flags & TRACE_ITER_BLOCK) { | |
3140 | /* | |
3141 | * Always select as readable when in blocking mode | |
3142 | */ | |
3143 | return POLLIN | POLLRDNORM; | |
afc2abc0 | 3144 | } else { |
2a2cc8f7 SSP |
3145 | if (!trace_empty(iter)) |
3146 | return POLLIN | POLLRDNORM; | |
3147 | poll_wait(filp, &trace_wait, poll_table); | |
3148 | if (!trace_empty(iter)) | |
3149 | return POLLIN | POLLRDNORM; | |
3150 | ||
3151 | return 0; | |
3152 | } | |
3153 | } | |
3154 | ||
b3806b43 SR |
3155 | /* |
3156 | * Consumer reader. | |
3157 | */ | |
3158 | static ssize_t | |
3159 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
3160 | size_t cnt, loff_t *ppos) | |
3161 | { | |
3162 | struct trace_iterator *iter = filp->private_data; | |
6c6c2796 | 3163 | ssize_t sret; |
b3806b43 SR |
3164 | |
3165 | /* return any leftover data */ | |
6c6c2796 PP |
3166 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
3167 | if (sret != -EBUSY) | |
3168 | return sret; | |
b3806b43 | 3169 | |
6c6c2796 | 3170 | trace_seq_reset(&iter->seq); |
b3806b43 | 3171 | |
107bad8b SR |
3172 | mutex_lock(&trace_types_lock); |
3173 | if (iter->trace->read) { | |
6c6c2796 PP |
3174 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); |
3175 | if (sret) | |
107bad8b | 3176 | goto out; |
107bad8b SR |
3177 | } |
3178 | ||
9ff4b974 PP |
3179 | waitagain: |
3180 | sret = 0; | |
b3806b43 | 3181 | while (trace_empty(iter)) { |
2dc8f095 | 3182 | |
107bad8b | 3183 | if ((filp->f_flags & O_NONBLOCK)) { |
6c6c2796 | 3184 | sret = -EAGAIN; |
107bad8b SR |
3185 | goto out; |
3186 | } | |
2dc8f095 | 3187 | |
b3806b43 SR |
3188 | /* |
3189 | * This is a make-shift waitqueue. The reason we don't use | |
3190 | * an actual wait queue is because: | |
3191 | * 1) we only ever have one waiter | |
3192 | * 2) the tracing, traces all functions, we don't want | |
3193 | * the overhead of calling wake_up and friends | |
3194 | * (and tracing them too) | |
3195 | * Anyway, this is really very primitive wakeup. | |
3196 | */ | |
3197 | set_current_state(TASK_INTERRUPTIBLE); | |
3198 | iter->tr->waiter = current; | |
3199 | ||
107bad8b SR |
3200 | mutex_unlock(&trace_types_lock); |
3201 | ||
9fe068e9 IM |
3202 | /* sleep for 100 msecs, and try again. */ |
3203 | schedule_timeout(HZ/10); | |
b3806b43 | 3204 | |
107bad8b SR |
3205 | mutex_lock(&trace_types_lock); |
3206 | ||
b3806b43 SR |
3207 | iter->tr->waiter = NULL; |
3208 | ||
107bad8b | 3209 | if (signal_pending(current)) { |
6c6c2796 | 3210 | sret = -EINTR; |
107bad8b SR |
3211 | goto out; |
3212 | } | |
b3806b43 | 3213 | |
84527997 | 3214 | if (iter->trace != current_trace) |
107bad8b | 3215 | goto out; |
84527997 | 3216 | |
b3806b43 SR |
3217 | /* |
3218 | * We block until we read something and tracing is disabled. | |
3219 | * We still block if tracing is disabled, but we have never | |
3220 | * read anything. This allows a user to cat this file, and | |
3221 | * then enable tracing. But after we have read something, | |
3222 | * we give an EOF when tracing is again disabled. | |
3223 | * | |
3224 | * iter->pos will be 0 if we haven't read anything. | |
3225 | */ | |
3226 | if (!tracer_enabled && iter->pos) | |
3227 | break; | |
3228 | ||
3229 | continue; | |
3230 | } | |
3231 | ||
3232 | /* stop when tracing is finished */ | |
3233 | if (trace_empty(iter)) | |
107bad8b | 3234 | goto out; |
b3806b43 SR |
3235 | |
3236 | if (cnt >= PAGE_SIZE) | |
3237 | cnt = PAGE_SIZE - 1; | |
3238 | ||
53d0aa77 | 3239 | /* reset all but tr, trace, and overruns */ |
53d0aa77 SR |
3240 | memset(&iter->seq, 0, |
3241 | sizeof(struct trace_iterator) - | |
3242 | offsetof(struct trace_iterator, seq)); | |
4823ed7e | 3243 | iter->pos = -1; |
b3806b43 | 3244 | |
088b1e42 | 3245 | while (find_next_entry_inc(iter) != NULL) { |
2c4f035f | 3246 | enum print_line_t ret; |
088b1e42 SR |
3247 | int len = iter->seq.len; |
3248 | ||
f9896bf3 | 3249 | ret = print_trace_line(iter); |
2c4f035f | 3250 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
088b1e42 SR |
3251 | /* don't print partial lines */ |
3252 | iter->seq.len = len; | |
b3806b43 | 3253 | break; |
088b1e42 | 3254 | } |
b3806b43 SR |
3255 | |
3256 | trace_consume(iter); | |
3257 | ||
3258 | if (iter->seq.len >= cnt) | |
3259 | break; | |
b3806b43 SR |
3260 | } |
3261 | ||
b3806b43 | 3262 | /* Now copy what we have to the user */ |
6c6c2796 PP |
3263 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
3264 | if (iter->seq.readpos >= iter->seq.len) | |
b3806b43 | 3265 | trace_seq_reset(&iter->seq); |
9ff4b974 PP |
3266 | |
3267 | /* | |
3268 | * If there was nothing to send to user, inspite of consuming trace | |
3269 | * entries, go back to wait for more entries. | |
3270 | */ | |
6c6c2796 | 3271 | if (sret == -EBUSY) |
9ff4b974 | 3272 | goto waitagain; |
b3806b43 | 3273 | |
107bad8b SR |
3274 | out: |
3275 | mutex_unlock(&trace_types_lock); | |
3276 | ||
6c6c2796 | 3277 | return sret; |
b3806b43 SR |
3278 | } |
3279 | ||
a98a3c3f SR |
3280 | static ssize_t |
3281 | tracing_entries_read(struct file *filp, char __user *ubuf, | |
3282 | size_t cnt, loff_t *ppos) | |
3283 | { | |
3284 | struct trace_array *tr = filp->private_data; | |
3285 | char buf[64]; | |
3286 | int r; | |
3287 | ||
1696b2b0 | 3288 | r = sprintf(buf, "%lu\n", tr->entries >> 10); |
a98a3c3f SR |
3289 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
3290 | } | |
3291 | ||
3292 | static ssize_t | |
3293 | tracing_entries_write(struct file *filp, const char __user *ubuf, | |
3294 | size_t cnt, loff_t *ppos) | |
3295 | { | |
3296 | unsigned long val; | |
3297 | char buf[64]; | |
bf5e6519 | 3298 | int ret, cpu; |
a98a3c3f | 3299 | |
cffae437 SR |
3300 | if (cnt >= sizeof(buf)) |
3301 | return -EINVAL; | |
a98a3c3f SR |
3302 | |
3303 | if (copy_from_user(&buf, ubuf, cnt)) | |
3304 | return -EFAULT; | |
3305 | ||
3306 | buf[cnt] = 0; | |
3307 | ||
c6caeeb1 SR |
3308 | ret = strict_strtoul(buf, 10, &val); |
3309 | if (ret < 0) | |
3310 | return ret; | |
a98a3c3f SR |
3311 | |
3312 | /* must have at least 1 entry */ | |
3313 | if (!val) | |
3314 | return -EINVAL; | |
3315 | ||
3316 | mutex_lock(&trace_types_lock); | |
3317 | ||
c76f0694 | 3318 | tracing_stop(); |
a98a3c3f | 3319 | |
bf5e6519 SR |
3320 | /* disable all cpu buffers */ |
3321 | for_each_tracing_cpu(cpu) { | |
3322 | if (global_trace.data[cpu]) | |
3323 | atomic_inc(&global_trace.data[cpu]->disabled); | |
3324 | if (max_tr.data[cpu]) | |
3325 | atomic_inc(&max_tr.data[cpu]->disabled); | |
3326 | } | |
3327 | ||
1696b2b0 SR |
3328 | /* value is in KB */ |
3329 | val <<= 10; | |
3330 | ||
3928a8a2 SR |
3331 | if (val != global_trace.entries) { |
3332 | ret = ring_buffer_resize(global_trace.buffer, val); | |
3333 | if (ret < 0) { | |
3334 | cnt = ret; | |
3eefae99 SR |
3335 | goto out; |
3336 | } | |
3337 | ||
3928a8a2 SR |
3338 | ret = ring_buffer_resize(max_tr.buffer, val); |
3339 | if (ret < 0) { | |
3340 | int r; | |
3341 | cnt = ret; | |
3342 | r = ring_buffer_resize(global_trace.buffer, | |
3343 | global_trace.entries); | |
3344 | if (r < 0) { | |
3345 | /* AARGH! We are left with different | |
3346 | * size max buffer!!!! */ | |
3347 | WARN_ON(1); | |
3348 | tracing_disabled = 1; | |
a98a3c3f | 3349 | } |
3928a8a2 | 3350 | goto out; |
a98a3c3f | 3351 | } |
3eefae99 | 3352 | |
3928a8a2 | 3353 | global_trace.entries = val; |
a98a3c3f SR |
3354 | } |
3355 | ||
3356 | filp->f_pos += cnt; | |
3357 | ||
19384c03 SR |
3358 | /* If check pages failed, return ENOMEM */ |
3359 | if (tracing_disabled) | |
3360 | cnt = -ENOMEM; | |
a98a3c3f | 3361 | out: |
bf5e6519 SR |
3362 | for_each_tracing_cpu(cpu) { |
3363 | if (global_trace.data[cpu]) | |
3364 | atomic_dec(&global_trace.data[cpu]->disabled); | |
3365 | if (max_tr.data[cpu]) | |
3366 | atomic_dec(&max_tr.data[cpu]->disabled); | |
3367 | } | |
3368 | ||
c76f0694 | 3369 | tracing_start(); |
a98a3c3f SR |
3370 | max_tr.entries = global_trace.entries; |
3371 | mutex_unlock(&trace_types_lock); | |
3372 | ||
3373 | return cnt; | |
3374 | } | |
3375 | ||
5bf9a1ee PP |
3376 | static int mark_printk(const char *fmt, ...) |
3377 | { | |
3378 | int ret; | |
3379 | va_list args; | |
3380 | va_start(args, fmt); | |
1fd8f2a3 | 3381 | ret = trace_vprintk(0, -1, fmt, args); |
5bf9a1ee PP |
3382 | va_end(args); |
3383 | return ret; | |
3384 | } | |
3385 | ||
3386 | static ssize_t | |
3387 | tracing_mark_write(struct file *filp, const char __user *ubuf, | |
3388 | size_t cnt, loff_t *fpos) | |
3389 | { | |
3390 | char *buf; | |
3391 | char *end; | |
5bf9a1ee | 3392 | |
c76f0694 | 3393 | if (tracing_disabled) |
5bf9a1ee PP |
3394 | return -EINVAL; |
3395 | ||
3396 | if (cnt > TRACE_BUF_SIZE) | |
3397 | cnt = TRACE_BUF_SIZE; | |
3398 | ||
3399 | buf = kmalloc(cnt + 1, GFP_KERNEL); | |
3400 | if (buf == NULL) | |
3401 | return -ENOMEM; | |
3402 | ||
3403 | if (copy_from_user(buf, ubuf, cnt)) { | |
3404 | kfree(buf); | |
3405 | return -EFAULT; | |
3406 | } | |
3407 | ||
3408 | /* Cut from the first nil or newline. */ | |
3409 | buf[cnt] = '\0'; | |
3410 | end = strchr(buf, '\n'); | |
3411 | if (end) | |
3412 | *end = '\0'; | |
3413 | ||
3414 | cnt = mark_printk("%s\n", buf); | |
3415 | kfree(buf); | |
3416 | *fpos += cnt; | |
3417 | ||
3418 | return cnt; | |
3419 | } | |
3420 | ||
bc0c38d1 | 3421 | static struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
3422 | .open = tracing_open_generic, |
3423 | .read = tracing_max_lat_read, | |
3424 | .write = tracing_max_lat_write, | |
bc0c38d1 SR |
3425 | }; |
3426 | ||
3427 | static struct file_operations tracing_ctrl_fops = { | |
4bf39a94 IM |
3428 | .open = tracing_open_generic, |
3429 | .read = tracing_ctrl_read, | |
3430 | .write = tracing_ctrl_write, | |
bc0c38d1 SR |
3431 | }; |
3432 | ||
3433 | static struct file_operations set_tracer_fops = { | |
4bf39a94 IM |
3434 | .open = tracing_open_generic, |
3435 | .read = tracing_set_trace_read, | |
3436 | .write = tracing_set_trace_write, | |
bc0c38d1 SR |
3437 | }; |
3438 | ||
b3806b43 | 3439 | static struct file_operations tracing_pipe_fops = { |
4bf39a94 | 3440 | .open = tracing_open_pipe, |
2a2cc8f7 | 3441 | .poll = tracing_poll_pipe, |
4bf39a94 IM |
3442 | .read = tracing_read_pipe, |
3443 | .release = tracing_release_pipe, | |
b3806b43 SR |
3444 | }; |
3445 | ||
a98a3c3f SR |
3446 | static struct file_operations tracing_entries_fops = { |
3447 | .open = tracing_open_generic, | |
3448 | .read = tracing_entries_read, | |
3449 | .write = tracing_entries_write, | |
3450 | }; | |
3451 | ||
5bf9a1ee | 3452 | static struct file_operations tracing_mark_fops = { |
43a15386 | 3453 | .open = tracing_open_generic, |
5bf9a1ee PP |
3454 | .write = tracing_mark_write, |
3455 | }; | |
3456 | ||
bc0c38d1 SR |
3457 | #ifdef CONFIG_DYNAMIC_FTRACE |
3458 | ||
b807c3d0 SR |
3459 | int __weak ftrace_arch_read_dyn_info(char *buf, int size) |
3460 | { | |
3461 | return 0; | |
3462 | } | |
3463 | ||
bc0c38d1 | 3464 | static ssize_t |
b807c3d0 | 3465 | tracing_read_dyn_info(struct file *filp, char __user *ubuf, |
bc0c38d1 SR |
3466 | size_t cnt, loff_t *ppos) |
3467 | { | |
a26a2a27 SR |
3468 | static char ftrace_dyn_info_buffer[1024]; |
3469 | static DEFINE_MUTEX(dyn_info_mutex); | |
bc0c38d1 | 3470 | unsigned long *p = filp->private_data; |
b807c3d0 | 3471 | char *buf = ftrace_dyn_info_buffer; |
a26a2a27 | 3472 | int size = ARRAY_SIZE(ftrace_dyn_info_buffer); |
bc0c38d1 SR |
3473 | int r; |
3474 | ||
b807c3d0 SR |
3475 | mutex_lock(&dyn_info_mutex); |
3476 | r = sprintf(buf, "%ld ", *p); | |
4bf39a94 | 3477 | |
a26a2a27 | 3478 | r += ftrace_arch_read_dyn_info(buf+r, (size-1)-r); |
b807c3d0 SR |
3479 | buf[r++] = '\n'; |
3480 | ||
3481 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
3482 | ||
3483 | mutex_unlock(&dyn_info_mutex); | |
3484 | ||
3485 | return r; | |
bc0c38d1 SR |
3486 | } |
3487 | ||
b807c3d0 | 3488 | static struct file_operations tracing_dyn_info_fops = { |
4bf39a94 | 3489 | .open = tracing_open_generic, |
b807c3d0 | 3490 | .read = tracing_read_dyn_info, |
bc0c38d1 SR |
3491 | }; |
3492 | #endif | |
3493 | ||
3494 | static struct dentry *d_tracer; | |
3495 | ||
3496 | struct dentry *tracing_init_dentry(void) | |
3497 | { | |
3498 | static int once; | |
3499 | ||
3500 | if (d_tracer) | |
3501 | return d_tracer; | |
3502 | ||
3503 | d_tracer = debugfs_create_dir("tracing", NULL); | |
3504 | ||
3505 | if (!d_tracer && !once) { | |
3506 | once = 1; | |
3507 | pr_warning("Could not create debugfs directory 'tracing'\n"); | |
3508 | return NULL; | |
3509 | } | |
3510 | ||
3511 | return d_tracer; | |
3512 | } | |
3513 | ||
60a11774 SR |
3514 | #ifdef CONFIG_FTRACE_SELFTEST |
3515 | /* Let selftest have access to static functions in this file */ | |
3516 | #include "trace_selftest.c" | |
3517 | #endif | |
3518 | ||
b5ad384e | 3519 | static __init int tracer_init_debugfs(void) |
bc0c38d1 SR |
3520 | { |
3521 | struct dentry *d_tracer; | |
3522 | struct dentry *entry; | |
3523 | ||
3524 | d_tracer = tracing_init_dentry(); | |
3525 | ||
3526 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, | |
3527 | &global_trace, &tracing_ctrl_fops); | |
3528 | if (!entry) | |
3529 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); | |
3530 | ||
ee6bce52 | 3531 | entry = debugfs_create_file("trace_options", 0644, d_tracer, |
bc0c38d1 SR |
3532 | NULL, &tracing_iter_fops); |
3533 | if (!entry) | |
ee6bce52 | 3534 | pr_warning("Could not create debugfs 'trace_options' entry\n"); |
bc0c38d1 | 3535 | |
c7078de1 IM |
3536 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
3537 | NULL, &tracing_cpumask_fops); | |
3538 | if (!entry) | |
3539 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); | |
3540 | ||
bc0c38d1 SR |
3541 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
3542 | &global_trace, &tracing_lt_fops); | |
3543 | if (!entry) | |
3544 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); | |
3545 | ||
3546 | entry = debugfs_create_file("trace", 0444, d_tracer, | |
3547 | &global_trace, &tracing_fops); | |
3548 | if (!entry) | |
3549 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
3550 | ||
3551 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, | |
3552 | &global_trace, &show_traces_fops); | |
3553 | if (!entry) | |
98a983aa | 3554 | pr_warning("Could not create debugfs 'available_tracers' entry\n"); |
bc0c38d1 SR |
3555 | |
3556 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, | |
3557 | &global_trace, &set_tracer_fops); | |
3558 | if (!entry) | |
98a983aa | 3559 | pr_warning("Could not create debugfs 'current_tracer' entry\n"); |
bc0c38d1 SR |
3560 | |
3561 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, | |
3562 | &tracing_max_latency, | |
3563 | &tracing_max_lat_fops); | |
3564 | if (!entry) | |
3565 | pr_warning("Could not create debugfs " | |
3566 | "'tracing_max_latency' entry\n"); | |
3567 | ||
3568 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, | |
3569 | &tracing_thresh, &tracing_max_lat_fops); | |
3570 | if (!entry) | |
3571 | pr_warning("Could not create debugfs " | |
98a983aa | 3572 | "'tracing_thresh' entry\n"); |
7bd2f24c IM |
3573 | entry = debugfs_create_file("README", 0644, d_tracer, |
3574 | NULL, &tracing_readme_fops); | |
3575 | if (!entry) | |
3576 | pr_warning("Could not create debugfs 'README' entry\n"); | |
3577 | ||
b3806b43 SR |
3578 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
3579 | NULL, &tracing_pipe_fops); | |
3580 | if (!entry) | |
3581 | pr_warning("Could not create debugfs " | |
98a983aa | 3582 | "'trace_pipe' entry\n"); |
bc0c38d1 | 3583 | |
a94c80e7 | 3584 | entry = debugfs_create_file("buffer_size_kb", 0644, d_tracer, |
a98a3c3f SR |
3585 | &global_trace, &tracing_entries_fops); |
3586 | if (!entry) | |
3587 | pr_warning("Could not create debugfs " | |
a94c80e7 | 3588 | "'buffer_size_kb' entry\n"); |
a98a3c3f | 3589 | |
5bf9a1ee PP |
3590 | entry = debugfs_create_file("trace_marker", 0220, d_tracer, |
3591 | NULL, &tracing_mark_fops); | |
3592 | if (!entry) | |
3593 | pr_warning("Could not create debugfs " | |
3594 | "'trace_marker' entry\n"); | |
3595 | ||
bc0c38d1 SR |
3596 | #ifdef CONFIG_DYNAMIC_FTRACE |
3597 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, | |
3598 | &ftrace_update_tot_cnt, | |
b807c3d0 | 3599 | &tracing_dyn_info_fops); |
bc0c38d1 SR |
3600 | if (!entry) |
3601 | pr_warning("Could not create debugfs " | |
3602 | "'dyn_ftrace_total_info' entry\n"); | |
3603 | #endif | |
d618b3e6 IM |
3604 | #ifdef CONFIG_SYSPROF_TRACER |
3605 | init_tracer_sysprof_debugfs(d_tracer); | |
3606 | #endif | |
b5ad384e | 3607 | return 0; |
bc0c38d1 SR |
3608 | } |
3609 | ||
1fd8f2a3 | 3610 | int trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args) |
dd0e545f | 3611 | { |
380c4b14 | 3612 | static DEFINE_SPINLOCK(trace_buf_lock); |
dd0e545f | 3613 | static char trace_buf[TRACE_BUF_SIZE]; |
f09ce573 | 3614 | |
3928a8a2 | 3615 | struct ring_buffer_event *event; |
f09ce573 | 3616 | struct trace_array *tr = &global_trace; |
dd0e545f | 3617 | struct trace_array_cpu *data; |
38697053 | 3618 | int cpu, len = 0, size, pc; |
e726f5f9 IM |
3619 | struct print_entry *entry; |
3620 | unsigned long irq_flags; | |
dd0e545f | 3621 | |
8e1b82e0 | 3622 | if (tracing_disabled || tracing_selftest_running) |
dd0e545f SR |
3623 | return 0; |
3624 | ||
38697053 SR |
3625 | pc = preempt_count(); |
3626 | preempt_disable_notrace(); | |
dd0e545f SR |
3627 | cpu = raw_smp_processor_id(); |
3628 | data = tr->data[cpu]; | |
dd0e545f | 3629 | |
3ea2e6d7 | 3630 | if (unlikely(atomic_read(&data->disabled))) |
dd0e545f SR |
3631 | goto out; |
3632 | ||
380c4b14 FW |
3633 | pause_graph_tracing(); |
3634 | spin_lock_irqsave(&trace_buf_lock, irq_flags); | |
801fe400 | 3635 | len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args); |
dd0e545f SR |
3636 | |
3637 | len = min(len, TRACE_BUF_SIZE-1); | |
3638 | trace_buf[len] = 0; | |
3639 | ||
777e208d SR |
3640 | size = sizeof(*entry) + len + 1; |
3641 | event = ring_buffer_lock_reserve(tr->buffer, size, &irq_flags); | |
3928a8a2 SR |
3642 | if (!event) |
3643 | goto out_unlock; | |
777e208d | 3644 | entry = ring_buffer_event_data(event); |
e726f5f9 | 3645 | tracing_generic_entry_update(&entry->ent, irq_flags, pc); |
777e208d SR |
3646 | entry->ent.type = TRACE_PRINT; |
3647 | entry->ip = ip; | |
1fd8f2a3 | 3648 | entry->depth = depth; |
dd0e545f | 3649 | |
777e208d SR |
3650 | memcpy(&entry->buf, trace_buf, len); |
3651 | entry->buf[len] = 0; | |
3928a8a2 | 3652 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
dd0e545f | 3653 | |
3928a8a2 | 3654 | out_unlock: |
380c4b14 FW |
3655 | spin_unlock_irqrestore(&trace_buf_lock, irq_flags); |
3656 | unpause_graph_tracing(); | |
dd0e545f | 3657 | out: |
38697053 | 3658 | preempt_enable_notrace(); |
dd0e545f SR |
3659 | |
3660 | return len; | |
3661 | } | |
801fe400 PP |
3662 | EXPORT_SYMBOL_GPL(trace_vprintk); |
3663 | ||
3664 | int __ftrace_printk(unsigned long ip, const char *fmt, ...) | |
3665 | { | |
3666 | int ret; | |
3667 | va_list ap; | |
3668 | ||
3669 | if (!(trace_flags & TRACE_ITER_PRINTK)) | |
3670 | return 0; | |
3671 | ||
3672 | va_start(ap, fmt); | |
21a8c466 | 3673 | ret = trace_vprintk(ip, task_curr_ret_stack(current), fmt, ap); |
801fe400 PP |
3674 | va_end(ap); |
3675 | return ret; | |
3676 | } | |
dd0e545f SR |
3677 | EXPORT_SYMBOL_GPL(__ftrace_printk); |
3678 | ||
3f5a54e3 SR |
3679 | static int trace_panic_handler(struct notifier_block *this, |
3680 | unsigned long event, void *unused) | |
3681 | { | |
944ac425 SR |
3682 | if (ftrace_dump_on_oops) |
3683 | ftrace_dump(); | |
3f5a54e3 SR |
3684 | return NOTIFY_OK; |
3685 | } | |
3686 | ||
3687 | static struct notifier_block trace_panic_notifier = { | |
3688 | .notifier_call = trace_panic_handler, | |
3689 | .next = NULL, | |
3690 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ | |
3691 | }; | |
3692 | ||
3693 | static int trace_die_handler(struct notifier_block *self, | |
3694 | unsigned long val, | |
3695 | void *data) | |
3696 | { | |
3697 | switch (val) { | |
3698 | case DIE_OOPS: | |
944ac425 SR |
3699 | if (ftrace_dump_on_oops) |
3700 | ftrace_dump(); | |
3f5a54e3 SR |
3701 | break; |
3702 | default: | |
3703 | break; | |
3704 | } | |
3705 | return NOTIFY_OK; | |
3706 | } | |
3707 | ||
3708 | static struct notifier_block trace_die_notifier = { | |
3709 | .notifier_call = trace_die_handler, | |
3710 | .priority = 200 | |
3711 | }; | |
3712 | ||
3713 | /* | |
3714 | * printk is set to max of 1024, we really don't need it that big. | |
3715 | * Nothing should be printing 1000 characters anyway. | |
3716 | */ | |
3717 | #define TRACE_MAX_PRINT 1000 | |
3718 | ||
3719 | /* | |
3720 | * Define here KERN_TRACE so that we have one place to modify | |
3721 | * it if we decide to change what log level the ftrace dump | |
3722 | * should be at. | |
3723 | */ | |
3724 | #define KERN_TRACE KERN_INFO | |
3725 | ||
3726 | static void | |
3727 | trace_printk_seq(struct trace_seq *s) | |
3728 | { | |
3729 | /* Probably should print a warning here. */ | |
3730 | if (s->len >= 1000) | |
3731 | s->len = 1000; | |
3732 | ||
3733 | /* should be zero ended, but we are paranoid. */ | |
3734 | s->buffer[s->len] = 0; | |
3735 | ||
3736 | printk(KERN_TRACE "%s", s->buffer); | |
3737 | ||
3738 | trace_seq_reset(s); | |
3739 | } | |
3740 | ||
3f5a54e3 SR |
3741 | void ftrace_dump(void) |
3742 | { | |
3743 | static DEFINE_SPINLOCK(ftrace_dump_lock); | |
3744 | /* use static because iter can be a bit big for the stack */ | |
3745 | static struct trace_iterator iter; | |
3f5a54e3 SR |
3746 | static cpumask_t mask; |
3747 | static int dump_ran; | |
d769041f SR |
3748 | unsigned long flags; |
3749 | int cnt = 0, cpu; | |
3f5a54e3 SR |
3750 | |
3751 | /* only one dump */ | |
3752 | spin_lock_irqsave(&ftrace_dump_lock, flags); | |
3753 | if (dump_ran) | |
3754 | goto out; | |
3755 | ||
3756 | dump_ran = 1; | |
3757 | ||
3758 | /* No turning back! */ | |
81adbdc0 | 3759 | ftrace_kill(); |
3f5a54e3 | 3760 | |
d769041f SR |
3761 | for_each_tracing_cpu(cpu) { |
3762 | atomic_inc(&global_trace.data[cpu]->disabled); | |
3763 | } | |
3764 | ||
b54d3de9 TE |
3765 | /* don't look at user memory in panic mode */ |
3766 | trace_flags &= ~TRACE_ITER_SYM_USEROBJ; | |
3767 | ||
3f5a54e3 SR |
3768 | printk(KERN_TRACE "Dumping ftrace buffer:\n"); |
3769 | ||
3770 | iter.tr = &global_trace; | |
3771 | iter.trace = current_trace; | |
3772 | ||
3773 | /* | |
3774 | * We need to stop all tracing on all CPUS to read the | |
3775 | * the next buffer. This is a bit expensive, but is | |
3776 | * not done often. We fill all what we can read, | |
3777 | * and then release the locks again. | |
3778 | */ | |
3779 | ||
3780 | cpus_clear(mask); | |
3781 | ||
3f5a54e3 SR |
3782 | while (!trace_empty(&iter)) { |
3783 | ||
3784 | if (!cnt) | |
3785 | printk(KERN_TRACE "---------------------------------\n"); | |
3786 | ||
3787 | cnt++; | |
3788 | ||
3789 | /* reset all but tr, trace, and overruns */ | |
3790 | memset(&iter.seq, 0, | |
3791 | sizeof(struct trace_iterator) - | |
3792 | offsetof(struct trace_iterator, seq)); | |
3793 | iter.iter_flags |= TRACE_FILE_LAT_FMT; | |
3794 | iter.pos = -1; | |
3795 | ||
3796 | if (find_next_entry_inc(&iter) != NULL) { | |
3797 | print_trace_line(&iter); | |
3798 | trace_consume(&iter); | |
3799 | } | |
3800 | ||
3801 | trace_printk_seq(&iter.seq); | |
3802 | } | |
3803 | ||
3804 | if (!cnt) | |
3805 | printk(KERN_TRACE " (ftrace buffer empty)\n"); | |
3806 | else | |
3807 | printk(KERN_TRACE "---------------------------------\n"); | |
3808 | ||
3f5a54e3 SR |
3809 | out: |
3810 | spin_unlock_irqrestore(&ftrace_dump_lock, flags); | |
3811 | } | |
3812 | ||
3928a8a2 | 3813 | __init static int tracer_alloc_buffers(void) |
bc0c38d1 | 3814 | { |
4c11d7ae | 3815 | struct trace_array_cpu *data; |
4c11d7ae SR |
3816 | int i; |
3817 | ||
3928a8a2 SR |
3818 | /* TODO: make the number of buffers hot pluggable with CPUS */ |
3819 | tracing_buffer_mask = cpu_possible_map; | |
4c11d7ae | 3820 | |
3928a8a2 SR |
3821 | global_trace.buffer = ring_buffer_alloc(trace_buf_size, |
3822 | TRACE_BUFFER_FLAGS); | |
3823 | if (!global_trace.buffer) { | |
3824 | printk(KERN_ERR "tracer: failed to allocate ring buffer!\n"); | |
3825 | WARN_ON(1); | |
3826 | return 0; | |
4c11d7ae | 3827 | } |
3928a8a2 | 3828 | global_trace.entries = ring_buffer_size(global_trace.buffer); |
4c11d7ae SR |
3829 | |
3830 | #ifdef CONFIG_TRACER_MAX_TRACE | |
3928a8a2 SR |
3831 | max_tr.buffer = ring_buffer_alloc(trace_buf_size, |
3832 | TRACE_BUFFER_FLAGS); | |
3833 | if (!max_tr.buffer) { | |
3834 | printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n"); | |
3835 | WARN_ON(1); | |
3836 | ring_buffer_free(global_trace.buffer); | |
3837 | return 0; | |
4c11d7ae | 3838 | } |
3928a8a2 SR |
3839 | max_tr.entries = ring_buffer_size(max_tr.buffer); |
3840 | WARN_ON(max_tr.entries != global_trace.entries); | |
a98a3c3f | 3841 | #endif |
ab46428c | 3842 | |
4c11d7ae | 3843 | /* Allocate the first page for all buffers */ |
ab46428c | 3844 | for_each_tracing_cpu(i) { |
4c11d7ae | 3845 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
bc0c38d1 | 3846 | max_tr.data[i] = &per_cpu(max_data, i); |
4c11d7ae | 3847 | } |
bc0c38d1 | 3848 | |
bc0c38d1 SR |
3849 | trace_init_cmdlines(); |
3850 | ||
43a15386 | 3851 | register_tracer(&nop_trace); |
b5ad384e FW |
3852 | #ifdef CONFIG_BOOT_TRACER |
3853 | register_tracer(&boot_tracer); | |
3854 | current_trace = &boot_tracer; | |
3855 | current_trace->init(&global_trace); | |
3856 | #else | |
43a15386 | 3857 | current_trace = &nop_trace; |
b5ad384e | 3858 | #endif |
bc0c38d1 | 3859 | |
60a11774 SR |
3860 | /* All seems OK, enable tracing */ |
3861 | tracing_disabled = 0; | |
3928a8a2 | 3862 | |
3f5a54e3 SR |
3863 | atomic_notifier_chain_register(&panic_notifier_list, |
3864 | &trace_panic_notifier); | |
3865 | ||
3866 | register_die_notifier(&trace_die_notifier); | |
3867 | ||
bc0c38d1 | 3868 | return 0; |
bc0c38d1 | 3869 | } |
b5ad384e FW |
3870 | early_initcall(tracer_alloc_buffers); |
3871 | fs_initcall(tracer_init_debugfs); |