Commit | Line | Data |
---|---|---|
bc0c38d1 SR |
1 | /* |
2 | * ring buffer based function tracer | |
3 | * | |
4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> | |
5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> | |
6 | * | |
7 | * Originally taken from the RT patch by: | |
8 | * Arnaldo Carvalho de Melo <acme@redhat.com> | |
9 | * | |
10 | * Based on code from the latency_tracer, that is: | |
11 | * Copyright (C) 2004-2006 Ingo Molnar | |
12 | * Copyright (C) 2004 William Lee Irwin III | |
13 | */ | |
14 | #include <linux/utsrelease.h> | |
15 | #include <linux/kallsyms.h> | |
16 | #include <linux/seq_file.h> | |
3f5a54e3 | 17 | #include <linux/notifier.h> |
bc0c38d1 | 18 | #include <linux/debugfs.h> |
4c11d7ae | 19 | #include <linux/pagemap.h> |
bc0c38d1 SR |
20 | #include <linux/hardirq.h> |
21 | #include <linux/linkage.h> | |
22 | #include <linux/uaccess.h> | |
23 | #include <linux/ftrace.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/percpu.h> | |
3f5a54e3 | 26 | #include <linux/kdebug.h> |
bc0c38d1 SR |
27 | #include <linux/ctype.h> |
28 | #include <linux/init.h> | |
2a2cc8f7 | 29 | #include <linux/poll.h> |
bc0c38d1 SR |
30 | #include <linux/gfp.h> |
31 | #include <linux/fs.h> | |
76094a2c | 32 | #include <linux/kprobes.h> |
3eefae99 | 33 | #include <linux/writeback.h> |
bc0c38d1 | 34 | |
86387f7e | 35 | #include <linux/stacktrace.h> |
3928a8a2 | 36 | #include <linux/ring_buffer.h> |
21798a84 | 37 | #include <linux/irqflags.h> |
86387f7e | 38 | |
bc0c38d1 | 39 | #include "trace.h" |
f0868d1e | 40 | #include "trace_output.h" |
bc0c38d1 | 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 | ||
9e01c1b7 | 93 | static cpumask_var_t __read_mostly tracing_buffer_mask; |
ab46428c SR |
94 | |
95 | #define for_each_tracing_cpu(cpu) \ | |
9e01c1b7 | 96 | for_each_cpu(cpu, tracing_buffer_mask) |
ab46428c | 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); | |
60a11774 | 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; | |
b6dff3ec | 324 | data->uid = task_uid(tsk); |
bc0c38d1 SR |
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 | ||
e309b41d | 333 | static void |
214023c3 SR |
334 | trace_seq_reset(struct trace_seq *s) |
335 | { | |
336 | s->len = 0; | |
6c6c2796 PP |
337 | s->readpos = 0; |
338 | } | |
339 | ||
340 | ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) | |
341 | { | |
342 | int len; | |
343 | int ret; | |
344 | ||
345 | if (s->len <= s->readpos) | |
346 | return -EBUSY; | |
347 | ||
348 | len = s->len - s->readpos; | |
349 | if (cnt > len) | |
350 | cnt = len; | |
351 | ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); | |
352 | if (ret) | |
353 | return -EFAULT; | |
354 | ||
355 | s->readpos += len; | |
356 | return cnt; | |
214023c3 SR |
357 | } |
358 | ||
e309b41d | 359 | static void |
214023c3 SR |
360 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
361 | { | |
362 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; | |
363 | ||
364 | s->buffer[len] = 0; | |
365 | seq_puts(m, s->buffer); | |
366 | ||
367 | trace_seq_reset(s); | |
368 | } | |
369 | ||
4fcdae83 SR |
370 | /** |
371 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr | |
372 | * @tr: tracer | |
373 | * @tsk: the task with the latency | |
374 | * @cpu: The cpu that initiated the trace. | |
375 | * | |
376 | * Flip the buffers between the @tr and the max_tr and record information | |
377 | * about which task was the cause of this latency. | |
378 | */ | |
e309b41d | 379 | void |
bc0c38d1 SR |
380 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
381 | { | |
3928a8a2 | 382 | struct ring_buffer *buf = tr->buffer; |
bc0c38d1 | 383 | |
4c11d7ae | 384 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 385 | __raw_spin_lock(&ftrace_max_lock); |
3928a8a2 SR |
386 | |
387 | tr->buffer = max_tr.buffer; | |
388 | max_tr.buffer = buf; | |
389 | ||
d769041f | 390 | ftrace_disable_cpu(); |
3928a8a2 | 391 | ring_buffer_reset(tr->buffer); |
d769041f | 392 | ftrace_enable_cpu(); |
bc0c38d1 SR |
393 | |
394 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 395 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
396 | } |
397 | ||
398 | /** | |
399 | * update_max_tr_single - only copy one trace over, and reset the rest | |
400 | * @tr - tracer | |
401 | * @tsk - task with the latency | |
402 | * @cpu - the cpu of the buffer to copy. | |
4fcdae83 SR |
403 | * |
404 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. | |
bc0c38d1 | 405 | */ |
e309b41d | 406 | void |
bc0c38d1 SR |
407 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
408 | { | |
3928a8a2 | 409 | int ret; |
bc0c38d1 | 410 | |
4c11d7ae | 411 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 412 | __raw_spin_lock(&ftrace_max_lock); |
bc0c38d1 | 413 | |
d769041f SR |
414 | ftrace_disable_cpu(); |
415 | ||
3928a8a2 SR |
416 | ring_buffer_reset(max_tr.buffer); |
417 | ret = ring_buffer_swap_cpu(max_tr.buffer, tr->buffer, cpu); | |
418 | ||
d769041f SR |
419 | ftrace_enable_cpu(); |
420 | ||
3928a8a2 | 421 | WARN_ON_ONCE(ret); |
bc0c38d1 SR |
422 | |
423 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 424 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
425 | } |
426 | ||
4fcdae83 SR |
427 | /** |
428 | * register_tracer - register a tracer with the ftrace system. | |
429 | * @type - the plugin for the tracer | |
430 | * | |
431 | * Register a new plugin tracer. | |
432 | */ | |
bc0c38d1 SR |
433 | int register_tracer(struct tracer *type) |
434 | { | |
435 | struct tracer *t; | |
436 | int len; | |
437 | int ret = 0; | |
438 | ||
439 | if (!type->name) { | |
440 | pr_info("Tracer must have a name\n"); | |
441 | return -1; | |
442 | } | |
443 | ||
86fa2f60 IM |
444 | /* |
445 | * When this gets called we hold the BKL which means that | |
446 | * preemption is disabled. Various trace selftests however | |
447 | * need to disable and enable preemption for successful tests. | |
448 | * So we drop the BKL here and grab it after the tests again. | |
449 | */ | |
450 | unlock_kernel(); | |
bc0c38d1 | 451 | mutex_lock(&trace_types_lock); |
86fa2f60 | 452 | |
8e1b82e0 FW |
453 | tracing_selftest_running = true; |
454 | ||
bc0c38d1 SR |
455 | for (t = trace_types; t; t = t->next) { |
456 | if (strcmp(type->name, t->name) == 0) { | |
457 | /* already found */ | |
458 | pr_info("Trace %s already registered\n", | |
459 | type->name); | |
460 | ret = -1; | |
461 | goto out; | |
462 | } | |
463 | } | |
464 | ||
adf9f195 FW |
465 | if (!type->set_flag) |
466 | type->set_flag = &dummy_set_flag; | |
467 | if (!type->flags) | |
468 | type->flags = &dummy_tracer_flags; | |
469 | else | |
470 | if (!type->flags->opts) | |
471 | type->flags->opts = dummy_tracer_opt; | |
472 | ||
60a11774 SR |
473 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
474 | if (type->selftest) { | |
475 | struct tracer *saved_tracer = current_trace; | |
60a11774 | 476 | struct trace_array *tr = &global_trace; |
60a11774 | 477 | int i; |
ff32504f | 478 | |
60a11774 SR |
479 | /* |
480 | * Run a selftest on this tracer. | |
481 | * Here we reset the trace buffer, and set the current | |
482 | * tracer to be this tracer. The tracer can then run some | |
483 | * internal tracing to verify that everything is in order. | |
484 | * If we fail, we do not register this tracer. | |
485 | */ | |
86fa2f60 | 486 | for_each_tracing_cpu(i) |
3928a8a2 | 487 | tracing_reset(tr, i); |
86fa2f60 | 488 | |
60a11774 | 489 | current_trace = type; |
60a11774 SR |
490 | /* the test is responsible for initializing and enabling */ |
491 | pr_info("Testing tracer %s: ", type->name); | |
492 | ret = type->selftest(type, tr); | |
493 | /* the test is responsible for resetting too */ | |
494 | current_trace = saved_tracer; | |
60a11774 SR |
495 | if (ret) { |
496 | printk(KERN_CONT "FAILED!\n"); | |
497 | goto out; | |
498 | } | |
1d4db00a | 499 | /* Only reset on passing, to avoid touching corrupted buffers */ |
86fa2f60 | 500 | for_each_tracing_cpu(i) |
3928a8a2 | 501 | tracing_reset(tr, i); |
86fa2f60 | 502 | |
60a11774 SR |
503 | printk(KERN_CONT "PASSED\n"); |
504 | } | |
505 | #endif | |
506 | ||
bc0c38d1 SR |
507 | type->next = trace_types; |
508 | trace_types = type; | |
509 | len = strlen(type->name); | |
510 | if (len > max_tracer_type_len) | |
511 | max_tracer_type_len = len; | |
60a11774 | 512 | |
bc0c38d1 | 513 | out: |
8e1b82e0 | 514 | tracing_selftest_running = false; |
bc0c38d1 | 515 | mutex_unlock(&trace_types_lock); |
86fa2f60 | 516 | lock_kernel(); |
bc0c38d1 SR |
517 | |
518 | return ret; | |
519 | } | |
520 | ||
521 | void unregister_tracer(struct tracer *type) | |
522 | { | |
523 | struct tracer **t; | |
524 | int len; | |
525 | ||
526 | mutex_lock(&trace_types_lock); | |
527 | for (t = &trace_types; *t; t = &(*t)->next) { | |
528 | if (*t == type) | |
529 | goto found; | |
530 | } | |
531 | pr_info("Trace %s not registered\n", type->name); | |
532 | goto out; | |
533 | ||
534 | found: | |
535 | *t = (*t)->next; | |
536 | if (strlen(type->name) != max_tracer_type_len) | |
537 | goto out; | |
538 | ||
539 | max_tracer_type_len = 0; | |
540 | for (t = &trace_types; *t; t = &(*t)->next) { | |
541 | len = strlen((*t)->name); | |
542 | if (len > max_tracer_type_len) | |
543 | max_tracer_type_len = len; | |
544 | } | |
545 | out: | |
546 | mutex_unlock(&trace_types_lock); | |
547 | } | |
548 | ||
3928a8a2 | 549 | void tracing_reset(struct trace_array *tr, int cpu) |
bc0c38d1 | 550 | { |
d769041f | 551 | ftrace_disable_cpu(); |
3928a8a2 | 552 | ring_buffer_reset_cpu(tr->buffer, cpu); |
d769041f | 553 | ftrace_enable_cpu(); |
bc0c38d1 SR |
554 | } |
555 | ||
213cc060 PE |
556 | void tracing_reset_online_cpus(struct trace_array *tr) |
557 | { | |
558 | int cpu; | |
559 | ||
560 | tr->time_start = ftrace_now(tr->cpu); | |
561 | ||
562 | for_each_online_cpu(cpu) | |
563 | tracing_reset(tr, cpu); | |
564 | } | |
565 | ||
bc0c38d1 SR |
566 | #define SAVED_CMDLINES 128 |
567 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; | |
568 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; | |
569 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; | |
570 | static int cmdline_idx; | |
571 | static DEFINE_SPINLOCK(trace_cmdline_lock); | |
25b0b44a | 572 | |
25b0b44a SR |
573 | /* temporary disable recording */ |
574 | atomic_t trace_record_cmdline_disabled __read_mostly; | |
bc0c38d1 SR |
575 | |
576 | static void trace_init_cmdlines(void) | |
577 | { | |
578 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); | |
579 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); | |
580 | cmdline_idx = 0; | |
581 | } | |
582 | ||
0f048701 SR |
583 | static int trace_stop_count; |
584 | static DEFINE_SPINLOCK(tracing_start_lock); | |
585 | ||
69bb54ec SR |
586 | /** |
587 | * ftrace_off_permanent - disable all ftrace code permanently | |
588 | * | |
589 | * This should only be called when a serious anomally has | |
590 | * been detected. This will turn off the function tracing, | |
591 | * ring buffers, and other tracing utilites. It takes no | |
592 | * locks and can be called from any context. | |
593 | */ | |
594 | void ftrace_off_permanent(void) | |
595 | { | |
596 | tracing_disabled = 1; | |
597 | ftrace_stop(); | |
598 | tracing_off_permanent(); | |
599 | } | |
600 | ||
0f048701 SR |
601 | /** |
602 | * tracing_start - quick start of the tracer | |
603 | * | |
604 | * If tracing is enabled but was stopped by tracing_stop, | |
605 | * this will start the tracer back up. | |
606 | */ | |
607 | void tracing_start(void) | |
608 | { | |
609 | struct ring_buffer *buffer; | |
610 | unsigned long flags; | |
611 | ||
612 | if (tracing_disabled) | |
613 | return; | |
614 | ||
615 | spin_lock_irqsave(&tracing_start_lock, flags); | |
616 | if (--trace_stop_count) | |
617 | goto out; | |
618 | ||
619 | if (trace_stop_count < 0) { | |
620 | /* Someone screwed up their debugging */ | |
621 | WARN_ON_ONCE(1); | |
622 | trace_stop_count = 0; | |
623 | goto out; | |
624 | } | |
625 | ||
626 | ||
627 | buffer = global_trace.buffer; | |
628 | if (buffer) | |
629 | ring_buffer_record_enable(buffer); | |
630 | ||
631 | buffer = max_tr.buffer; | |
632 | if (buffer) | |
633 | ring_buffer_record_enable(buffer); | |
634 | ||
635 | ftrace_start(); | |
636 | out: | |
637 | spin_unlock_irqrestore(&tracing_start_lock, flags); | |
638 | } | |
639 | ||
640 | /** | |
641 | * tracing_stop - quick stop of the tracer | |
642 | * | |
643 | * Light weight way to stop tracing. Use in conjunction with | |
644 | * tracing_start. | |
645 | */ | |
646 | void tracing_stop(void) | |
647 | { | |
648 | struct ring_buffer *buffer; | |
649 | unsigned long flags; | |
650 | ||
651 | ftrace_stop(); | |
652 | spin_lock_irqsave(&tracing_start_lock, flags); | |
653 | if (trace_stop_count++) | |
654 | goto out; | |
655 | ||
656 | buffer = global_trace.buffer; | |
657 | if (buffer) | |
658 | ring_buffer_record_disable(buffer); | |
659 | ||
660 | buffer = max_tr.buffer; | |
661 | if (buffer) | |
662 | ring_buffer_record_disable(buffer); | |
663 | ||
664 | out: | |
665 | spin_unlock_irqrestore(&tracing_start_lock, flags); | |
666 | } | |
667 | ||
e309b41d | 668 | void trace_stop_cmdline_recording(void); |
bc0c38d1 | 669 | |
e309b41d | 670 | static void trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
671 | { |
672 | unsigned map; | |
673 | unsigned idx; | |
674 | ||
675 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
676 | return; | |
677 | ||
678 | /* | |
679 | * It's not the end of the world if we don't get | |
680 | * the lock, but we also don't want to spin | |
681 | * nor do we want to disable interrupts, | |
682 | * so if we miss here, then better luck next time. | |
683 | */ | |
684 | if (!spin_trylock(&trace_cmdline_lock)) | |
685 | return; | |
686 | ||
687 | idx = map_pid_to_cmdline[tsk->pid]; | |
688 | if (idx >= SAVED_CMDLINES) { | |
689 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; | |
690 | ||
691 | map = map_cmdline_to_pid[idx]; | |
692 | if (map <= PID_MAX_DEFAULT) | |
693 | map_pid_to_cmdline[map] = (unsigned)-1; | |
694 | ||
695 | map_pid_to_cmdline[tsk->pid] = idx; | |
696 | ||
697 | cmdline_idx = idx; | |
698 | } | |
699 | ||
700 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); | |
701 | ||
702 | spin_unlock(&trace_cmdline_lock); | |
703 | } | |
704 | ||
660c7f9b | 705 | char *trace_find_cmdline(int pid) |
bc0c38d1 SR |
706 | { |
707 | char *cmdline = "<...>"; | |
708 | unsigned map; | |
709 | ||
710 | if (!pid) | |
711 | return "<idle>"; | |
712 | ||
713 | if (pid > PID_MAX_DEFAULT) | |
714 | goto out; | |
715 | ||
716 | map = map_pid_to_cmdline[pid]; | |
717 | if (map >= SAVED_CMDLINES) | |
718 | goto out; | |
719 | ||
720 | cmdline = saved_cmdlines[map]; | |
721 | ||
722 | out: | |
723 | return cmdline; | |
724 | } | |
725 | ||
e309b41d | 726 | void tracing_record_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
727 | { |
728 | if (atomic_read(&trace_record_cmdline_disabled)) | |
729 | return; | |
730 | ||
731 | trace_save_cmdline(tsk); | |
732 | } | |
733 | ||
45dcd8b8 | 734 | void |
38697053 SR |
735 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags, |
736 | int pc) | |
bc0c38d1 SR |
737 | { |
738 | struct task_struct *tsk = current; | |
bc0c38d1 | 739 | |
777e208d SR |
740 | entry->preempt_count = pc & 0xff; |
741 | entry->pid = (tsk) ? tsk->pid : 0; | |
b54d3de9 | 742 | entry->tgid = (tsk) ? tsk->tgid : 0; |
777e208d | 743 | entry->flags = |
9244489a | 744 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT |
2e2ca155 | 745 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
9244489a SR |
746 | #else |
747 | TRACE_FLAG_IRQS_NOSUPPORT | | |
748 | #endif | |
bc0c38d1 SR |
749 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
750 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | | |
751 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); | |
752 | } | |
753 | ||
e309b41d | 754 | void |
6fb44b71 | 755 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
38697053 SR |
756 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
757 | int pc) | |
bc0c38d1 | 758 | { |
3928a8a2 | 759 | struct ring_buffer_event *event; |
777e208d | 760 | struct ftrace_entry *entry; |
dcb6308f | 761 | unsigned long irq_flags; |
bc0c38d1 | 762 | |
d769041f SR |
763 | /* If we are reading the ring buffer, don't trace */ |
764 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) | |
765 | return; | |
766 | ||
3928a8a2 SR |
767 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
768 | &irq_flags); | |
769 | if (!event) | |
770 | return; | |
771 | entry = ring_buffer_event_data(event); | |
38697053 | 772 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
773 | entry->ent.type = TRACE_FN; |
774 | entry->ip = ip; | |
775 | entry->parent_ip = parent_ip; | |
3928a8a2 | 776 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
bc0c38d1 SR |
777 | } |
778 | ||
fb52607a | 779 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
287b6e68 FW |
780 | static void __trace_graph_entry(struct trace_array *tr, |
781 | struct trace_array_cpu *data, | |
782 | struct ftrace_graph_ent *trace, | |
783 | unsigned long flags, | |
784 | int pc) | |
785 | { | |
786 | struct ring_buffer_event *event; | |
787 | struct ftrace_graph_ent_entry *entry; | |
788 | unsigned long irq_flags; | |
789 | ||
790 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) | |
791 | return; | |
792 | ||
793 | event = ring_buffer_lock_reserve(global_trace.buffer, sizeof(*entry), | |
794 | &irq_flags); | |
795 | if (!event) | |
796 | return; | |
797 | entry = ring_buffer_event_data(event); | |
798 | tracing_generic_entry_update(&entry->ent, flags, pc); | |
799 | entry->ent.type = TRACE_GRAPH_ENT; | |
800 | entry->graph_ent = *trace; | |
801 | ring_buffer_unlock_commit(global_trace.buffer, event, irq_flags); | |
802 | } | |
803 | ||
804 | static void __trace_graph_return(struct trace_array *tr, | |
15e6cb36 | 805 | struct trace_array_cpu *data, |
fb52607a | 806 | struct ftrace_graph_ret *trace, |
15e6cb36 FW |
807 | unsigned long flags, |
808 | int pc) | |
809 | { | |
810 | struct ring_buffer_event *event; | |
287b6e68 | 811 | struct ftrace_graph_ret_entry *entry; |
15e6cb36 FW |
812 | unsigned long irq_flags; |
813 | ||
814 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) | |
815 | return; | |
816 | ||
817 | event = ring_buffer_lock_reserve(global_trace.buffer, sizeof(*entry), | |
818 | &irq_flags); | |
819 | if (!event) | |
820 | return; | |
821 | entry = ring_buffer_event_data(event); | |
822 | tracing_generic_entry_update(&entry->ent, flags, pc); | |
287b6e68 FW |
823 | entry->ent.type = TRACE_GRAPH_RET; |
824 | entry->ret = *trace; | |
15e6cb36 FW |
825 | ring_buffer_unlock_commit(global_trace.buffer, event, irq_flags); |
826 | } | |
827 | #endif | |
828 | ||
e309b41d | 829 | void |
2e0f5761 | 830 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
38697053 SR |
831 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
832 | int pc) | |
2e0f5761 IM |
833 | { |
834 | if (likely(!atomic_read(&data->disabled))) | |
38697053 | 835 | trace_function(tr, data, ip, parent_ip, flags, pc); |
2e0f5761 IM |
836 | } |
837 | ||
38697053 SR |
838 | static void ftrace_trace_stack(struct trace_array *tr, |
839 | struct trace_array_cpu *data, | |
840 | unsigned long flags, | |
841 | int skip, int pc) | |
86387f7e | 842 | { |
c2c80529 | 843 | #ifdef CONFIG_STACKTRACE |
3928a8a2 | 844 | struct ring_buffer_event *event; |
777e208d | 845 | struct stack_entry *entry; |
86387f7e | 846 | struct stack_trace trace; |
3928a8a2 | 847 | unsigned long irq_flags; |
86387f7e IM |
848 | |
849 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) | |
850 | return; | |
851 | ||
3928a8a2 SR |
852 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
853 | &irq_flags); | |
854 | if (!event) | |
855 | return; | |
856 | entry = ring_buffer_event_data(event); | |
38697053 | 857 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d | 858 | entry->ent.type = TRACE_STACK; |
86387f7e | 859 | |
777e208d | 860 | memset(&entry->caller, 0, sizeof(entry->caller)); |
86387f7e IM |
861 | |
862 | trace.nr_entries = 0; | |
863 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
864 | trace.skip = skip; | |
777e208d | 865 | trace.entries = entry->caller; |
86387f7e IM |
866 | |
867 | save_stack_trace(&trace); | |
3928a8a2 | 868 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
c2c80529 | 869 | #endif |
f0a920d5 IM |
870 | } |
871 | ||
38697053 SR |
872 | void __trace_stack(struct trace_array *tr, |
873 | struct trace_array_cpu *data, | |
874 | unsigned long flags, | |
875 | int skip) | |
876 | { | |
877 | ftrace_trace_stack(tr, data, flags, skip, preempt_count()); | |
878 | } | |
879 | ||
02b67518 TE |
880 | static void ftrace_trace_userstack(struct trace_array *tr, |
881 | struct trace_array_cpu *data, | |
882 | unsigned long flags, int pc) | |
883 | { | |
c7425acb | 884 | #ifdef CONFIG_STACKTRACE |
8d7c6a96 | 885 | struct ring_buffer_event *event; |
02b67518 TE |
886 | struct userstack_entry *entry; |
887 | struct stack_trace trace; | |
02b67518 TE |
888 | unsigned long irq_flags; |
889 | ||
890 | if (!(trace_flags & TRACE_ITER_USERSTACKTRACE)) | |
891 | return; | |
892 | ||
893 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), | |
894 | &irq_flags); | |
895 | if (!event) | |
896 | return; | |
897 | entry = ring_buffer_event_data(event); | |
898 | tracing_generic_entry_update(&entry->ent, flags, pc); | |
899 | entry->ent.type = TRACE_USER_STACK; | |
900 | ||
901 | memset(&entry->caller, 0, sizeof(entry->caller)); | |
902 | ||
903 | trace.nr_entries = 0; | |
904 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
905 | trace.skip = 0; | |
906 | trace.entries = entry->caller; | |
907 | ||
908 | save_stack_trace_user(&trace); | |
909 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); | |
c7425acb | 910 | #endif |
02b67518 TE |
911 | } |
912 | ||
913 | void __trace_userstack(struct trace_array *tr, | |
914 | struct trace_array_cpu *data, | |
915 | unsigned long flags) | |
916 | { | |
917 | ftrace_trace_userstack(tr, data, flags, preempt_count()); | |
918 | } | |
919 | ||
38697053 SR |
920 | static void |
921 | ftrace_trace_special(void *__tr, void *__data, | |
922 | unsigned long arg1, unsigned long arg2, unsigned long arg3, | |
923 | int pc) | |
a4feb834 | 924 | { |
3928a8a2 | 925 | struct ring_buffer_event *event; |
a4feb834 IM |
926 | struct trace_array_cpu *data = __data; |
927 | struct trace_array *tr = __tr; | |
777e208d | 928 | struct special_entry *entry; |
a4feb834 IM |
929 | unsigned long irq_flags; |
930 | ||
3928a8a2 SR |
931 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
932 | &irq_flags); | |
933 | if (!event) | |
934 | return; | |
935 | entry = ring_buffer_event_data(event); | |
38697053 | 936 | tracing_generic_entry_update(&entry->ent, 0, pc); |
777e208d SR |
937 | entry->ent.type = TRACE_SPECIAL; |
938 | entry->arg1 = arg1; | |
939 | entry->arg2 = arg2; | |
940 | entry->arg3 = arg3; | |
3928a8a2 | 941 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 942 | ftrace_trace_stack(tr, data, irq_flags, 4, pc); |
02b67518 | 943 | ftrace_trace_userstack(tr, data, irq_flags, pc); |
a4feb834 IM |
944 | |
945 | trace_wake_up(); | |
946 | } | |
947 | ||
38697053 SR |
948 | void |
949 | __trace_special(void *__tr, void *__data, | |
950 | unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
951 | { | |
952 | ftrace_trace_special(__tr, __data, arg1, arg2, arg3, preempt_count()); | |
953 | } | |
954 | ||
e309b41d | 955 | void |
bc0c38d1 SR |
956 | tracing_sched_switch_trace(struct trace_array *tr, |
957 | struct trace_array_cpu *data, | |
86387f7e IM |
958 | struct task_struct *prev, |
959 | struct task_struct *next, | |
38697053 | 960 | unsigned long flags, int pc) |
bc0c38d1 | 961 | { |
3928a8a2 | 962 | struct ring_buffer_event *event; |
777e208d | 963 | struct ctx_switch_entry *entry; |
dcb6308f | 964 | unsigned long irq_flags; |
bc0c38d1 | 965 | |
3928a8a2 SR |
966 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
967 | &irq_flags); | |
968 | if (!event) | |
969 | return; | |
970 | entry = ring_buffer_event_data(event); | |
38697053 | 971 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
972 | entry->ent.type = TRACE_CTX; |
973 | entry->prev_pid = prev->pid; | |
974 | entry->prev_prio = prev->prio; | |
975 | entry->prev_state = prev->state; | |
976 | entry->next_pid = next->pid; | |
977 | entry->next_prio = next->prio; | |
978 | entry->next_state = next->state; | |
979 | entry->next_cpu = task_cpu(next); | |
3928a8a2 | 980 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 981 | ftrace_trace_stack(tr, data, flags, 5, pc); |
02b67518 | 982 | ftrace_trace_userstack(tr, data, flags, pc); |
bc0c38d1 SR |
983 | } |
984 | ||
57422797 IM |
985 | void |
986 | tracing_sched_wakeup_trace(struct trace_array *tr, | |
987 | struct trace_array_cpu *data, | |
86387f7e IM |
988 | struct task_struct *wakee, |
989 | struct task_struct *curr, | |
38697053 | 990 | unsigned long flags, int pc) |
57422797 | 991 | { |
3928a8a2 | 992 | struct ring_buffer_event *event; |
777e208d | 993 | struct ctx_switch_entry *entry; |
57422797 IM |
994 | unsigned long irq_flags; |
995 | ||
3928a8a2 SR |
996 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
997 | &irq_flags); | |
998 | if (!event) | |
999 | return; | |
1000 | entry = ring_buffer_event_data(event); | |
38697053 | 1001 | tracing_generic_entry_update(&entry->ent, flags, pc); |
777e208d SR |
1002 | entry->ent.type = TRACE_WAKE; |
1003 | entry->prev_pid = curr->pid; | |
1004 | entry->prev_prio = curr->prio; | |
1005 | entry->prev_state = curr->state; | |
1006 | entry->next_pid = wakee->pid; | |
1007 | entry->next_prio = wakee->prio; | |
1008 | entry->next_state = wakee->state; | |
1009 | entry->next_cpu = task_cpu(wakee); | |
3928a8a2 | 1010 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
38697053 | 1011 | ftrace_trace_stack(tr, data, flags, 6, pc); |
02b67518 | 1012 | ftrace_trace_userstack(tr, data, flags, pc); |
017730c1 IM |
1013 | |
1014 | trace_wake_up(); | |
57422797 IM |
1015 | } |
1016 | ||
4902f884 SR |
1017 | void |
1018 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
1019 | { | |
1020 | struct trace_array *tr = &global_trace; | |
1021 | struct trace_array_cpu *data; | |
5aa1ba6a | 1022 | unsigned long flags; |
4902f884 | 1023 | int cpu; |
38697053 | 1024 | int pc; |
4902f884 | 1025 | |
c76f0694 | 1026 | if (tracing_disabled) |
4902f884 SR |
1027 | return; |
1028 | ||
38697053 | 1029 | pc = preempt_count(); |
5aa1ba6a | 1030 | local_irq_save(flags); |
4902f884 SR |
1031 | cpu = raw_smp_processor_id(); |
1032 | data = tr->data[cpu]; | |
4902f884 | 1033 | |
5aa1ba6a | 1034 | if (likely(atomic_inc_return(&data->disabled) == 1)) |
38697053 | 1035 | ftrace_trace_special(tr, data, arg1, arg2, arg3, pc); |
4902f884 | 1036 | |
5aa1ba6a SR |
1037 | atomic_dec(&data->disabled); |
1038 | local_irq_restore(flags); | |
4902f884 SR |
1039 | } |
1040 | ||
606576ce | 1041 | #ifdef CONFIG_FUNCTION_TRACER |
e309b41d | 1042 | static void |
b2a866f9 | 1043 | function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip) |
2e0f5761 IM |
1044 | { |
1045 | struct trace_array *tr = &global_trace; | |
1046 | struct trace_array_cpu *data; | |
1047 | unsigned long flags; | |
1048 | long disabled; | |
38697053 SR |
1049 | int cpu, resched; |
1050 | int pc; | |
2e0f5761 | 1051 | |
60bc0800 | 1052 | if (unlikely(!ftrace_function_enabled)) |
2e0f5761 IM |
1053 | return; |
1054 | ||
38697053 | 1055 | pc = preempt_count(); |
182e9f5f | 1056 | resched = ftrace_preempt_disable(); |
38697053 | 1057 | local_save_flags(flags); |
2e0f5761 IM |
1058 | cpu = raw_smp_processor_id(); |
1059 | data = tr->data[cpu]; | |
1060 | disabled = atomic_inc_return(&data->disabled); | |
1061 | ||
1062 | if (likely(disabled == 1)) | |
38697053 | 1063 | trace_function(tr, data, ip, parent_ip, flags, pc); |
2e0f5761 IM |
1064 | |
1065 | atomic_dec(&data->disabled); | |
182e9f5f | 1066 | ftrace_preempt_enable(resched); |
2e0f5761 IM |
1067 | } |
1068 | ||
b2a866f9 SR |
1069 | static void |
1070 | function_trace_call(unsigned long ip, unsigned long parent_ip) | |
1071 | { | |
1072 | struct trace_array *tr = &global_trace; | |
1073 | struct trace_array_cpu *data; | |
1074 | unsigned long flags; | |
1075 | long disabled; | |
1076 | int cpu; | |
1077 | int pc; | |
1078 | ||
1079 | if (unlikely(!ftrace_function_enabled)) | |
1080 | return; | |
1081 | ||
1082 | /* | |
1083 | * Need to use raw, since this must be called before the | |
1084 | * recursive protection is performed. | |
1085 | */ | |
d51ad7ac | 1086 | local_irq_save(flags); |
b2a866f9 SR |
1087 | cpu = raw_smp_processor_id(); |
1088 | data = tr->data[cpu]; | |
1089 | disabled = atomic_inc_return(&data->disabled); | |
1090 | ||
1091 | if (likely(disabled == 1)) { | |
1092 | pc = preempt_count(); | |
1093 | trace_function(tr, data, ip, parent_ip, flags, pc); | |
1094 | } | |
1095 | ||
1096 | atomic_dec(&data->disabled); | |
d51ad7ac | 1097 | local_irq_restore(flags); |
b2a866f9 SR |
1098 | } |
1099 | ||
fb52607a | 1100 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
e49dc19c | 1101 | int trace_graph_entry(struct ftrace_graph_ent *trace) |
15e6cb36 FW |
1102 | { |
1103 | struct trace_array *tr = &global_trace; | |
1104 | struct trace_array_cpu *data; | |
1105 | unsigned long flags; | |
1106 | long disabled; | |
1107 | int cpu; | |
1108 | int pc; | |
1109 | ||
804a6851 SR |
1110 | if (!ftrace_trace_task(current)) |
1111 | return 0; | |
1112 | ||
ea4e2bc4 SR |
1113 | if (!ftrace_graph_addr(trace->func)) |
1114 | return 0; | |
1115 | ||
a5e25883 | 1116 | local_irq_save(flags); |
15e6cb36 FW |
1117 | cpu = raw_smp_processor_id(); |
1118 | data = tr->data[cpu]; | |
1119 | disabled = atomic_inc_return(&data->disabled); | |
1120 | if (likely(disabled == 1)) { | |
1121 | pc = preempt_count(); | |
287b6e68 FW |
1122 | __trace_graph_entry(tr, data, trace, flags, pc); |
1123 | } | |
ea4e2bc4 SR |
1124 | /* Only do the atomic if it is not already set */ |
1125 | if (!test_tsk_trace_graph(current)) | |
1126 | set_tsk_trace_graph(current); | |
287b6e68 | 1127 | atomic_dec(&data->disabled); |
a5e25883 | 1128 | local_irq_restore(flags); |
e49dc19c SR |
1129 | |
1130 | return 1; | |
287b6e68 FW |
1131 | } |
1132 | ||
1133 | void trace_graph_return(struct ftrace_graph_ret *trace) | |
1134 | { | |
1135 | struct trace_array *tr = &global_trace; | |
1136 | struct trace_array_cpu *data; | |
1137 | unsigned long flags; | |
1138 | long disabled; | |
1139 | int cpu; | |
1140 | int pc; | |
1141 | ||
a5e25883 | 1142 | local_irq_save(flags); |
287b6e68 FW |
1143 | cpu = raw_smp_processor_id(); |
1144 | data = tr->data[cpu]; | |
1145 | disabled = atomic_inc_return(&data->disabled); | |
1146 | if (likely(disabled == 1)) { | |
1147 | pc = preempt_count(); | |
1148 | __trace_graph_return(tr, data, trace, flags, pc); | |
15e6cb36 | 1149 | } |
ea4e2bc4 SR |
1150 | if (!trace->depth) |
1151 | clear_tsk_trace_graph(current); | |
15e6cb36 | 1152 | atomic_dec(&data->disabled); |
a5e25883 | 1153 | local_irq_restore(flags); |
15e6cb36 | 1154 | } |
fb52607a | 1155 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 1156 | |
2e0f5761 IM |
1157 | static struct ftrace_ops trace_ops __read_mostly = |
1158 | { | |
1159 | .func = function_trace_call, | |
1160 | }; | |
1161 | ||
e309b41d | 1162 | void tracing_start_function_trace(void) |
2e0f5761 | 1163 | { |
60bc0800 | 1164 | ftrace_function_enabled = 0; |
b2a866f9 SR |
1165 | |
1166 | if (trace_flags & TRACE_ITER_PREEMPTONLY) | |
1167 | trace_ops.func = function_trace_call_preempt_only; | |
1168 | else | |
1169 | trace_ops.func = function_trace_call; | |
1170 | ||
2e0f5761 | 1171 | register_ftrace_function(&trace_ops); |
9036990d | 1172 | ftrace_function_enabled = 1; |
2e0f5761 IM |
1173 | } |
1174 | ||
e309b41d | 1175 | void tracing_stop_function_trace(void) |
2e0f5761 | 1176 | { |
60bc0800 | 1177 | ftrace_function_enabled = 0; |
2e0f5761 IM |
1178 | unregister_ftrace_function(&trace_ops); |
1179 | } | |
1180 | #endif | |
1181 | ||
bc0c38d1 SR |
1182 | enum trace_file_type { |
1183 | TRACE_FILE_LAT_FMT = 1, | |
12ef7d44 | 1184 | TRACE_FILE_ANNOTATE = 2, |
bc0c38d1 SR |
1185 | }; |
1186 | ||
e2ac8ef5 | 1187 | static void trace_iterator_increment(struct trace_iterator *iter) |
5a90f577 | 1188 | { |
d769041f SR |
1189 | /* Don't allow ftrace to trace into the ring buffers */ |
1190 | ftrace_disable_cpu(); | |
1191 | ||
5a90f577 | 1192 | iter->idx++; |
d769041f SR |
1193 | if (iter->buffer_iter[iter->cpu]) |
1194 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); | |
1195 | ||
1196 | ftrace_enable_cpu(); | |
5a90f577 SR |
1197 | } |
1198 | ||
e309b41d | 1199 | static struct trace_entry * |
3928a8a2 | 1200 | peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts) |
dd0e545f | 1201 | { |
3928a8a2 SR |
1202 | struct ring_buffer_event *event; |
1203 | struct ring_buffer_iter *buf_iter = iter->buffer_iter[cpu]; | |
dd0e545f | 1204 | |
d769041f SR |
1205 | /* Don't allow ftrace to trace into the ring buffers */ |
1206 | ftrace_disable_cpu(); | |
1207 | ||
1208 | if (buf_iter) | |
1209 | event = ring_buffer_iter_peek(buf_iter, ts); | |
1210 | else | |
1211 | event = ring_buffer_peek(iter->tr->buffer, cpu, ts); | |
1212 | ||
1213 | ftrace_enable_cpu(); | |
1214 | ||
3928a8a2 | 1215 | return event ? ring_buffer_event_data(event) : NULL; |
dd0e545f | 1216 | } |
d769041f | 1217 | |
dd0e545f | 1218 | static struct trace_entry * |
3928a8a2 | 1219 | __find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
bc0c38d1 | 1220 | { |
3928a8a2 | 1221 | struct ring_buffer *buffer = iter->tr->buffer; |
bc0c38d1 | 1222 | struct trace_entry *ent, *next = NULL; |
3928a8a2 | 1223 | u64 next_ts = 0, ts; |
bc0c38d1 SR |
1224 | int next_cpu = -1; |
1225 | int cpu; | |
1226 | ||
ab46428c | 1227 | for_each_tracing_cpu(cpu) { |
dd0e545f | 1228 | |
3928a8a2 SR |
1229 | if (ring_buffer_empty_cpu(buffer, cpu)) |
1230 | continue; | |
dd0e545f | 1231 | |
3928a8a2 | 1232 | ent = peek_next_entry(iter, cpu, &ts); |
dd0e545f | 1233 | |
cdd31cd2 IM |
1234 | /* |
1235 | * Pick the entry with the smallest timestamp: | |
1236 | */ | |
3928a8a2 | 1237 | if (ent && (!next || ts < next_ts)) { |
bc0c38d1 SR |
1238 | next = ent; |
1239 | next_cpu = cpu; | |
3928a8a2 | 1240 | next_ts = ts; |
bc0c38d1 SR |
1241 | } |
1242 | } | |
1243 | ||
1244 | if (ent_cpu) | |
1245 | *ent_cpu = next_cpu; | |
1246 | ||
3928a8a2 SR |
1247 | if (ent_ts) |
1248 | *ent_ts = next_ts; | |
1249 | ||
bc0c38d1 SR |
1250 | return next; |
1251 | } | |
1252 | ||
dd0e545f SR |
1253 | /* Find the next real entry, without updating the iterator itself */ |
1254 | static struct trace_entry * | |
3928a8a2 | 1255 | find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
bc0c38d1 | 1256 | { |
3928a8a2 | 1257 | return __find_next_entry(iter, ent_cpu, ent_ts); |
dd0e545f SR |
1258 | } |
1259 | ||
1260 | /* Find the next real entry, and increment the iterator to the next entry */ | |
1261 | static void *find_next_entry_inc(struct trace_iterator *iter) | |
1262 | { | |
3928a8a2 | 1263 | iter->ent = __find_next_entry(iter, &iter->cpu, &iter->ts); |
dd0e545f | 1264 | |
3928a8a2 | 1265 | if (iter->ent) |
e2ac8ef5 | 1266 | trace_iterator_increment(iter); |
dd0e545f | 1267 | |
3928a8a2 | 1268 | return iter->ent ? iter : NULL; |
b3806b43 | 1269 | } |
bc0c38d1 | 1270 | |
e309b41d | 1271 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 | 1272 | { |
d769041f SR |
1273 | /* Don't allow ftrace to trace into the ring buffers */ |
1274 | ftrace_disable_cpu(); | |
3928a8a2 | 1275 | ring_buffer_consume(iter->tr->buffer, iter->cpu, &iter->ts); |
d769041f | 1276 | ftrace_enable_cpu(); |
bc0c38d1 SR |
1277 | } |
1278 | ||
e309b41d | 1279 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
1280 | { |
1281 | struct trace_iterator *iter = m->private; | |
bc0c38d1 | 1282 | int i = (int)*pos; |
4e3c3333 | 1283 | void *ent; |
bc0c38d1 SR |
1284 | |
1285 | (*pos)++; | |
1286 | ||
1287 | /* can't go backwards */ | |
1288 | if (iter->idx > i) | |
1289 | return NULL; | |
1290 | ||
1291 | if (iter->idx < 0) | |
1292 | ent = find_next_entry_inc(iter); | |
1293 | else | |
1294 | ent = iter; | |
1295 | ||
1296 | while (ent && iter->idx < i) | |
1297 | ent = find_next_entry_inc(iter); | |
1298 | ||
1299 | iter->pos = *pos; | |
1300 | ||
bc0c38d1 SR |
1301 | return ent; |
1302 | } | |
1303 | ||
1304 | static void *s_start(struct seq_file *m, loff_t *pos) | |
1305 | { | |
1306 | struct trace_iterator *iter = m->private; | |
1307 | void *p = NULL; | |
1308 | loff_t l = 0; | |
3928a8a2 | 1309 | int cpu; |
bc0c38d1 SR |
1310 | |
1311 | mutex_lock(&trace_types_lock); | |
1312 | ||
d15f57f2 SR |
1313 | if (!current_trace || current_trace != iter->trace) { |
1314 | mutex_unlock(&trace_types_lock); | |
bc0c38d1 | 1315 | return NULL; |
d15f57f2 | 1316 | } |
bc0c38d1 SR |
1317 | |
1318 | atomic_inc(&trace_record_cmdline_disabled); | |
1319 | ||
bc0c38d1 SR |
1320 | if (*pos != iter->pos) { |
1321 | iter->ent = NULL; | |
1322 | iter->cpu = 0; | |
1323 | iter->idx = -1; | |
1324 | ||
d769041f SR |
1325 | ftrace_disable_cpu(); |
1326 | ||
3928a8a2 SR |
1327 | for_each_tracing_cpu(cpu) { |
1328 | ring_buffer_iter_reset(iter->buffer_iter[cpu]); | |
4c11d7ae | 1329 | } |
bc0c38d1 | 1330 | |
d769041f SR |
1331 | ftrace_enable_cpu(); |
1332 | ||
bc0c38d1 SR |
1333 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
1334 | ; | |
1335 | ||
1336 | } else { | |
4c11d7ae | 1337 | l = *pos - 1; |
bc0c38d1 SR |
1338 | p = s_next(m, p, &l); |
1339 | } | |
1340 | ||
1341 | return p; | |
1342 | } | |
1343 | ||
1344 | static void s_stop(struct seq_file *m, void *p) | |
1345 | { | |
bc0c38d1 | 1346 | atomic_dec(&trace_record_cmdline_disabled); |
bc0c38d1 SR |
1347 | mutex_unlock(&trace_types_lock); |
1348 | } | |
1349 | ||
e309b41d | 1350 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 | 1351 | { |
a6168353 ME |
1352 | seq_puts(m, "# _------=> CPU# \n"); |
1353 | seq_puts(m, "# / _-----=> irqs-off \n"); | |
1354 | seq_puts(m, "# | / _----=> need-resched \n"); | |
1355 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); | |
1356 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); | |
1357 | seq_puts(m, "# |||| / \n"); | |
1358 | seq_puts(m, "# ||||| delay \n"); | |
1359 | seq_puts(m, "# cmd pid ||||| time | caller \n"); | |
1360 | seq_puts(m, "# \\ / ||||| \\ | / \n"); | |
bc0c38d1 SR |
1361 | } |
1362 | ||
e309b41d | 1363 | static void print_func_help_header(struct seq_file *m) |
bc0c38d1 | 1364 | { |
a6168353 ME |
1365 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
1366 | seq_puts(m, "# | | | | |\n"); | |
bc0c38d1 SR |
1367 | } |
1368 | ||
1369 | ||
e309b41d | 1370 | static void |
bc0c38d1 SR |
1371 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
1372 | { | |
1373 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); | |
1374 | struct trace_array *tr = iter->tr; | |
1375 | struct trace_array_cpu *data = tr->data[tr->cpu]; | |
1376 | struct tracer *type = current_trace; | |
3928a8a2 SR |
1377 | unsigned long total; |
1378 | unsigned long entries; | |
bc0c38d1 SR |
1379 | const char *name = "preemption"; |
1380 | ||
1381 | if (type) | |
1382 | name = type->name; | |
1383 | ||
3928a8a2 SR |
1384 | entries = ring_buffer_entries(iter->tr->buffer); |
1385 | total = entries + | |
1386 | ring_buffer_overruns(iter->tr->buffer); | |
bc0c38d1 SR |
1387 | |
1388 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", | |
1389 | name, UTS_RELEASE); | |
1390 | seq_puts(m, "-----------------------------------" | |
1391 | "---------------------------------\n"); | |
1392 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" | |
1393 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", | |
57f50be1 | 1394 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 1395 | entries, |
4c11d7ae | 1396 | total, |
bc0c38d1 SR |
1397 | tr->cpu, |
1398 | #if defined(CONFIG_PREEMPT_NONE) | |
1399 | "server", | |
1400 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
1401 | "desktop", | |
b5c21b45 | 1402 | #elif defined(CONFIG_PREEMPT) |
bc0c38d1 SR |
1403 | "preempt", |
1404 | #else | |
1405 | "unknown", | |
1406 | #endif | |
1407 | /* These are reserved for later use */ | |
1408 | 0, 0, 0, 0); | |
1409 | #ifdef CONFIG_SMP | |
1410 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
1411 | #else | |
1412 | seq_puts(m, ")\n"); | |
1413 | #endif | |
1414 | seq_puts(m, " -----------------\n"); | |
1415 | seq_printf(m, " | task: %.16s-%d " | |
1416 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", | |
1417 | data->comm, data->pid, data->uid, data->nice, | |
1418 | data->policy, data->rt_priority); | |
1419 | seq_puts(m, " -----------------\n"); | |
1420 | ||
1421 | if (data->critical_start) { | |
1422 | seq_puts(m, " => started at: "); | |
214023c3 SR |
1423 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
1424 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 | 1425 | seq_puts(m, "\n => ended at: "); |
214023c3 SR |
1426 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
1427 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 SR |
1428 | seq_puts(m, "\n"); |
1429 | } | |
1430 | ||
1431 | seq_puts(m, "\n"); | |
1432 | } | |
1433 | ||
e309b41d | 1434 | static void |
214023c3 | 1435 | lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) |
bc0c38d1 SR |
1436 | { |
1437 | int hardirq, softirq; | |
1438 | char *comm; | |
1439 | ||
777e208d | 1440 | comm = trace_find_cmdline(entry->pid); |
bc0c38d1 | 1441 | |
777e208d | 1442 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
a6168353 | 1443 | trace_seq_printf(s, "%3d", cpu); |
214023c3 | 1444 | trace_seq_printf(s, "%c%c", |
9244489a SR |
1445 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : |
1446 | (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : '.', | |
777e208d | 1447 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); |
bc0c38d1 | 1448 | |
777e208d SR |
1449 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; |
1450 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; | |
afc2abc0 | 1451 | if (hardirq && softirq) { |
214023c3 | 1452 | trace_seq_putc(s, 'H'); |
afc2abc0 IM |
1453 | } else { |
1454 | if (hardirq) { | |
214023c3 | 1455 | trace_seq_putc(s, 'h'); |
afc2abc0 | 1456 | } else { |
bc0c38d1 | 1457 | if (softirq) |
214023c3 | 1458 | trace_seq_putc(s, 's'); |
bc0c38d1 | 1459 | else |
214023c3 | 1460 | trace_seq_putc(s, '.'); |
bc0c38d1 SR |
1461 | } |
1462 | } | |
1463 | ||
777e208d SR |
1464 | if (entry->preempt_count) |
1465 | trace_seq_printf(s, "%x", entry->preempt_count); | |
bc0c38d1 | 1466 | else |
214023c3 | 1467 | trace_seq_puts(s, "."); |
bc0c38d1 SR |
1468 | } |
1469 | ||
1470 | unsigned long preempt_mark_thresh = 100; | |
1471 | ||
e309b41d | 1472 | static void |
3928a8a2 | 1473 | lat_print_timestamp(struct trace_seq *s, u64 abs_usecs, |
bc0c38d1 SR |
1474 | unsigned long rel_usecs) |
1475 | { | |
214023c3 | 1476 | trace_seq_printf(s, " %4lldus", abs_usecs); |
bc0c38d1 | 1477 | if (rel_usecs > preempt_mark_thresh) |
214023c3 | 1478 | trace_seq_puts(s, "!: "); |
bc0c38d1 | 1479 | else if (rel_usecs > 1) |
214023c3 | 1480 | trace_seq_puts(s, "+: "); |
bc0c38d1 | 1481 | else |
214023c3 | 1482 | trace_seq_puts(s, " : "); |
bc0c38d1 SR |
1483 | } |
1484 | ||
a309720c SR |
1485 | static void test_cpu_buff_start(struct trace_iterator *iter) |
1486 | { | |
1487 | struct trace_seq *s = &iter->seq; | |
1488 | ||
12ef7d44 SR |
1489 | if (!(trace_flags & TRACE_ITER_ANNOTATE)) |
1490 | return; | |
1491 | ||
1492 | if (!(iter->iter_flags & TRACE_FILE_ANNOTATE)) | |
1493 | return; | |
1494 | ||
4462344e | 1495 | if (cpumask_test_cpu(iter->cpu, iter->started)) |
a309720c SR |
1496 | return; |
1497 | ||
4462344e | 1498 | cpumask_set_cpu(iter->cpu, iter->started); |
a309720c SR |
1499 | trace_seq_printf(s, "##### CPU %u buffer started ####\n", iter->cpu); |
1500 | } | |
1501 | ||
2c4f035f | 1502 | static enum print_line_t |
214023c3 | 1503 | print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) |
bc0c38d1 | 1504 | { |
214023c3 | 1505 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1506 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
3928a8a2 | 1507 | struct trace_entry *next_entry; |
f633cef0 | 1508 | struct trace_event *event; |
bc0c38d1 SR |
1509 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); |
1510 | struct trace_entry *entry = iter->ent; | |
1511 | unsigned long abs_usecs; | |
1512 | unsigned long rel_usecs; | |
3928a8a2 | 1513 | u64 next_ts; |
bc0c38d1 | 1514 | char *comm; |
f633cef0 | 1515 | int ret; |
dd0e545f | 1516 | |
a309720c SR |
1517 | test_cpu_buff_start(iter); |
1518 | ||
3928a8a2 SR |
1519 | next_entry = find_next_entry(iter, NULL, &next_ts); |
1520 | if (!next_entry) | |
1521 | next_ts = iter->ts; | |
1522 | rel_usecs = ns2usecs(next_ts - iter->ts); | |
1523 | abs_usecs = ns2usecs(iter->ts - iter->tr->time_start); | |
bc0c38d1 SR |
1524 | |
1525 | if (verbose) { | |
777e208d | 1526 | comm = trace_find_cmdline(entry->pid); |
a6168353 | 1527 | trace_seq_printf(s, "%16s %5d %3d %d %08x %08x [%08lx]" |
214023c3 SR |
1528 | " %ld.%03ldms (+%ld.%03ldms): ", |
1529 | comm, | |
777e208d SR |
1530 | entry->pid, cpu, entry->flags, |
1531 | entry->preempt_count, trace_idx, | |
3928a8a2 | 1532 | ns2usecs(iter->ts), |
214023c3 SR |
1533 | abs_usecs/1000, |
1534 | abs_usecs % 1000, rel_usecs/1000, | |
1535 | rel_usecs % 1000); | |
bc0c38d1 | 1536 | } else { |
f29c73fe IM |
1537 | lat_print_generic(s, entry, cpu); |
1538 | lat_print_timestamp(s, abs_usecs, rel_usecs); | |
bc0c38d1 | 1539 | } |
777e208d | 1540 | |
f633cef0 SR |
1541 | event = ftrace_find_event(entry->type); |
1542 | if (event && event->latency_trace) { | |
1543 | ret = event->latency_trace(s, entry, sym_flags); | |
1544 | if (ret) | |
1545 | return ret; | |
1546 | return TRACE_TYPE_HANDLED; | |
52f232cb | 1547 | } |
02b67518 | 1548 | |
f633cef0 | 1549 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
2c4f035f | 1550 | return TRACE_TYPE_HANDLED; |
bc0c38d1 SR |
1551 | } |
1552 | ||
2c4f035f | 1553 | static enum print_line_t print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 1554 | { |
214023c3 | 1555 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1556 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 1557 | struct trace_entry *entry; |
f633cef0 | 1558 | struct trace_event *event; |
bc0c38d1 SR |
1559 | unsigned long usec_rem; |
1560 | unsigned long long t; | |
1561 | unsigned long secs; | |
1562 | char *comm; | |
b3806b43 | 1563 | int ret; |
bc0c38d1 | 1564 | |
4e3c3333 | 1565 | entry = iter->ent; |
dd0e545f | 1566 | |
a309720c SR |
1567 | test_cpu_buff_start(iter); |
1568 | ||
777e208d | 1569 | comm = trace_find_cmdline(iter->ent->pid); |
bc0c38d1 | 1570 | |
3928a8a2 | 1571 | t = ns2usecs(iter->ts); |
bc0c38d1 SR |
1572 | usec_rem = do_div(t, 1000000ULL); |
1573 | secs = (unsigned long)t; | |
1574 | ||
777e208d | 1575 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
f29c73fe | 1576 | if (!ret) |
2c4f035f | 1577 | return TRACE_TYPE_PARTIAL_LINE; |
a6168353 | 1578 | ret = trace_seq_printf(s, "[%03d] ", iter->cpu); |
f29c73fe | 1579 | if (!ret) |
2c4f035f | 1580 | return TRACE_TYPE_PARTIAL_LINE; |
f29c73fe IM |
1581 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); |
1582 | if (!ret) | |
2c4f035f | 1583 | return TRACE_TYPE_PARTIAL_LINE; |
bc0c38d1 | 1584 | |
f633cef0 SR |
1585 | event = ftrace_find_event(entry->type); |
1586 | if (event && event->trace) { | |
1587 | ret = event->trace(s, entry, sym_flags); | |
1588 | if (ret) | |
1589 | return ret; | |
1590 | return TRACE_TYPE_HANDLED; | |
52f232cb | 1591 | } |
f633cef0 SR |
1592 | ret = trace_seq_printf(s, "Unknown type %d\n", entry->type); |
1593 | if (!ret) | |
1594 | return TRACE_TYPE_PARTIAL_LINE; | |
02b67518 | 1595 | |
2c4f035f | 1596 | return TRACE_TYPE_HANDLED; |
bc0c38d1 SR |
1597 | } |
1598 | ||
2c4f035f | 1599 | static enum print_line_t print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 IM |
1600 | { |
1601 | struct trace_seq *s = &iter->seq; | |
1602 | struct trace_entry *entry; | |
f633cef0 | 1603 | struct trace_event *event; |
f9896bf3 | 1604 | int ret; |
f9896bf3 IM |
1605 | |
1606 | entry = iter->ent; | |
dd0e545f | 1607 | |
f9896bf3 | 1608 | ret = trace_seq_printf(s, "%d %d %llu ", |
777e208d | 1609 | entry->pid, iter->cpu, iter->ts); |
f9896bf3 | 1610 | if (!ret) |
2c4f035f | 1611 | return TRACE_TYPE_PARTIAL_LINE; |
f9896bf3 | 1612 | |
f633cef0 SR |
1613 | event = ftrace_find_event(entry->type); |
1614 | if (event && event->raw) { | |
1615 | ret = event->raw(s, entry, 0); | |
1616 | if (ret) | |
1617 | return ret; | |
1618 | return TRACE_TYPE_HANDLED; | |
777e208d | 1619 | } |
f633cef0 SR |
1620 | ret = trace_seq_printf(s, "%d ?\n", entry->type); |
1621 | if (!ret) | |
1622 | return TRACE_TYPE_PARTIAL_LINE; | |
777e208d | 1623 | |
2c4f035f | 1624 | return TRACE_TYPE_HANDLED; |
f9896bf3 IM |
1625 | } |
1626 | ||
2c4f035f | 1627 | static enum print_line_t print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec IM |
1628 | { |
1629 | struct trace_seq *s = &iter->seq; | |
1630 | unsigned char newline = '\n'; | |
1631 | struct trace_entry *entry; | |
f633cef0 | 1632 | struct trace_event *event; |
5e3ca0ec IM |
1633 | |
1634 | entry = iter->ent; | |
dd0e545f | 1635 | |
777e208d | 1636 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); |
5e3ca0ec | 1637 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); |
3928a8a2 | 1638 | SEQ_PUT_HEX_FIELD_RET(s, iter->ts); |
5e3ca0ec | 1639 | |
f633cef0 SR |
1640 | event = ftrace_find_event(entry->type); |
1641 | if (event && event->hex) | |
1642 | event->hex(s, entry, 0); | |
7104f300 | 1643 | |
5e3ca0ec IM |
1644 | SEQ_PUT_FIELD_RET(s, newline); |
1645 | ||
2c4f035f | 1646 | return TRACE_TYPE_HANDLED; |
5e3ca0ec IM |
1647 | } |
1648 | ||
66896a85 FW |
1649 | static enum print_line_t print_printk_msg_only(struct trace_iterator *iter) |
1650 | { | |
1651 | struct trace_seq *s = &iter->seq; | |
1652 | struct trace_entry *entry = iter->ent; | |
1653 | struct print_entry *field; | |
1654 | int ret; | |
1655 | ||
1656 | trace_assign_type(field, entry); | |
1657 | ||
1658 | ret = trace_seq_printf(s, field->buf); | |
1659 | if (!ret) | |
1660 | return TRACE_TYPE_PARTIAL_LINE; | |
1661 | ||
66896a85 FW |
1662 | return TRACE_TYPE_HANDLED; |
1663 | } | |
1664 | ||
2c4f035f | 1665 | static enum print_line_t print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa IM |
1666 | { |
1667 | struct trace_seq *s = &iter->seq; | |
1668 | struct trace_entry *entry; | |
f633cef0 | 1669 | struct trace_event *event; |
cb0f12aa IM |
1670 | |
1671 | entry = iter->ent; | |
dd0e545f | 1672 | |
777e208d | 1673 | SEQ_PUT_FIELD_RET(s, entry->pid); |
072ba498 | 1674 | SEQ_PUT_FIELD_RET(s, entry->cpu); |
3928a8a2 | 1675 | SEQ_PUT_FIELD_RET(s, iter->ts); |
cb0f12aa | 1676 | |
f633cef0 SR |
1677 | event = ftrace_find_event(entry->type); |
1678 | if (event && event->binary) | |
1679 | event->binary(s, entry, 0); | |
777e208d | 1680 | |
f633cef0 | 1681 | return TRACE_TYPE_HANDLED; |
cb0f12aa IM |
1682 | } |
1683 | ||
bc0c38d1 SR |
1684 | static int trace_empty(struct trace_iterator *iter) |
1685 | { | |
bc0c38d1 SR |
1686 | int cpu; |
1687 | ||
ab46428c | 1688 | for_each_tracing_cpu(cpu) { |
d769041f SR |
1689 | if (iter->buffer_iter[cpu]) { |
1690 | if (!ring_buffer_iter_empty(iter->buffer_iter[cpu])) | |
1691 | return 0; | |
1692 | } else { | |
1693 | if (!ring_buffer_empty_cpu(iter->tr->buffer, cpu)) | |
1694 | return 0; | |
1695 | } | |
bc0c38d1 | 1696 | } |
d769041f | 1697 | |
797d3712 | 1698 | return 1; |
bc0c38d1 SR |
1699 | } |
1700 | ||
2c4f035f | 1701 | static enum print_line_t print_trace_line(struct trace_iterator *iter) |
f9896bf3 | 1702 | { |
2c4f035f FW |
1703 | enum print_line_t ret; |
1704 | ||
1705 | if (iter->trace && iter->trace->print_line) { | |
1706 | ret = iter->trace->print_line(iter); | |
1707 | if (ret != TRACE_TYPE_UNHANDLED) | |
1708 | return ret; | |
1709 | } | |
72829bc3 | 1710 | |
66896a85 FW |
1711 | if (iter->ent->type == TRACE_PRINT && |
1712 | trace_flags & TRACE_ITER_PRINTK && | |
1713 | trace_flags & TRACE_ITER_PRINTK_MSGONLY) | |
1714 | return print_printk_msg_only(iter); | |
1715 | ||
cb0f12aa IM |
1716 | if (trace_flags & TRACE_ITER_BIN) |
1717 | return print_bin_fmt(iter); | |
1718 | ||
5e3ca0ec IM |
1719 | if (trace_flags & TRACE_ITER_HEX) |
1720 | return print_hex_fmt(iter); | |
1721 | ||
f9896bf3 IM |
1722 | if (trace_flags & TRACE_ITER_RAW) |
1723 | return print_raw_fmt(iter); | |
1724 | ||
1725 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
1726 | return print_lat_fmt(iter, iter->idx, iter->cpu); | |
1727 | ||
1728 | return print_trace_fmt(iter); | |
1729 | } | |
1730 | ||
bc0c38d1 SR |
1731 | static int s_show(struct seq_file *m, void *v) |
1732 | { | |
1733 | struct trace_iterator *iter = v; | |
1734 | ||
1735 | if (iter->ent == NULL) { | |
1736 | if (iter->tr) { | |
1737 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
1738 | seq_puts(m, "#\n"); | |
1739 | } | |
8bba1bf5 MM |
1740 | if (iter->trace && iter->trace->print_header) |
1741 | iter->trace->print_header(m); | |
1742 | else if (iter->iter_flags & TRACE_FILE_LAT_FMT) { | |
bc0c38d1 SR |
1743 | /* print nothing if the buffers are empty */ |
1744 | if (trace_empty(iter)) | |
1745 | return 0; | |
1746 | print_trace_header(m, iter); | |
1747 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1748 | print_lat_help_header(m); | |
1749 | } else { | |
1750 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1751 | print_func_help_header(m); | |
1752 | } | |
1753 | } else { | |
f9896bf3 | 1754 | print_trace_line(iter); |
214023c3 | 1755 | trace_print_seq(m, &iter->seq); |
bc0c38d1 SR |
1756 | } |
1757 | ||
1758 | return 0; | |
1759 | } | |
1760 | ||
1761 | static struct seq_operations tracer_seq_ops = { | |
4bf39a94 IM |
1762 | .start = s_start, |
1763 | .next = s_next, | |
1764 | .stop = s_stop, | |
1765 | .show = s_show, | |
bc0c38d1 SR |
1766 | }; |
1767 | ||
e309b41d | 1768 | static struct trace_iterator * |
bc0c38d1 SR |
1769 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
1770 | { | |
1771 | struct trace_iterator *iter; | |
3928a8a2 SR |
1772 | struct seq_file *m; |
1773 | int cpu; | |
bc0c38d1 | 1774 | |
60a11774 SR |
1775 | if (tracing_disabled) { |
1776 | *ret = -ENODEV; | |
1777 | return NULL; | |
1778 | } | |
1779 | ||
bc0c38d1 SR |
1780 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
1781 | if (!iter) { | |
1782 | *ret = -ENOMEM; | |
1783 | goto out; | |
1784 | } | |
1785 | ||
1786 | mutex_lock(&trace_types_lock); | |
1787 | if (current_trace && current_trace->print_max) | |
1788 | iter->tr = &max_tr; | |
1789 | else | |
1790 | iter->tr = inode->i_private; | |
1791 | iter->trace = current_trace; | |
1792 | iter->pos = -1; | |
1793 | ||
8bba1bf5 MM |
1794 | /* Notify the tracer early; before we stop tracing. */ |
1795 | if (iter->trace && iter->trace->open) | |
a93751ca | 1796 | iter->trace->open(iter); |
8bba1bf5 | 1797 | |
12ef7d44 SR |
1798 | /* Annotate start of buffers if we had overruns */ |
1799 | if (ring_buffer_overruns(iter->tr->buffer)) | |
1800 | iter->iter_flags |= TRACE_FILE_ANNOTATE; | |
1801 | ||
1802 | ||
3928a8a2 | 1803 | for_each_tracing_cpu(cpu) { |
d769041f | 1804 | |
3928a8a2 SR |
1805 | iter->buffer_iter[cpu] = |
1806 | ring_buffer_read_start(iter->tr->buffer, cpu); | |
d769041f | 1807 | |
3928a8a2 SR |
1808 | if (!iter->buffer_iter[cpu]) |
1809 | goto fail_buffer; | |
1810 | } | |
1811 | ||
bc0c38d1 SR |
1812 | /* TODO stop tracer */ |
1813 | *ret = seq_open(file, &tracer_seq_ops); | |
3928a8a2 SR |
1814 | if (*ret) |
1815 | goto fail_buffer; | |
bc0c38d1 | 1816 | |
3928a8a2 SR |
1817 | m = file->private_data; |
1818 | m->private = iter; | |
bc0c38d1 | 1819 | |
3928a8a2 | 1820 | /* stop the trace while dumping */ |
9036990d | 1821 | tracing_stop(); |
3928a8a2 | 1822 | |
bc0c38d1 SR |
1823 | mutex_unlock(&trace_types_lock); |
1824 | ||
1825 | out: | |
1826 | return iter; | |
3928a8a2 SR |
1827 | |
1828 | fail_buffer: | |
1829 | for_each_tracing_cpu(cpu) { | |
1830 | if (iter->buffer_iter[cpu]) | |
1831 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
1832 | } | |
1833 | mutex_unlock(&trace_types_lock); | |
0bb943c7 | 1834 | kfree(iter); |
3928a8a2 SR |
1835 | |
1836 | return ERR_PTR(-ENOMEM); | |
bc0c38d1 SR |
1837 | } |
1838 | ||
1839 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
1840 | { | |
60a11774 SR |
1841 | if (tracing_disabled) |
1842 | return -ENODEV; | |
1843 | ||
bc0c38d1 SR |
1844 | filp->private_data = inode->i_private; |
1845 | return 0; | |
1846 | } | |
1847 | ||
1848 | int tracing_release(struct inode *inode, struct file *file) | |
1849 | { | |
1850 | struct seq_file *m = (struct seq_file *)file->private_data; | |
1851 | struct trace_iterator *iter = m->private; | |
3928a8a2 | 1852 | int cpu; |
bc0c38d1 SR |
1853 | |
1854 | mutex_lock(&trace_types_lock); | |
3928a8a2 SR |
1855 | for_each_tracing_cpu(cpu) { |
1856 | if (iter->buffer_iter[cpu]) | |
1857 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
1858 | } | |
1859 | ||
bc0c38d1 SR |
1860 | if (iter->trace && iter->trace->close) |
1861 | iter->trace->close(iter); | |
1862 | ||
1863 | /* reenable tracing if it was previously enabled */ | |
9036990d | 1864 | tracing_start(); |
bc0c38d1 SR |
1865 | mutex_unlock(&trace_types_lock); |
1866 | ||
1867 | seq_release(inode, file); | |
1868 | kfree(iter); | |
1869 | return 0; | |
1870 | } | |
1871 | ||
1872 | static int tracing_open(struct inode *inode, struct file *file) | |
1873 | { | |
1874 | int ret; | |
1875 | ||
1876 | __tracing_open(inode, file, &ret); | |
1877 | ||
1878 | return ret; | |
1879 | } | |
1880 | ||
1881 | static int tracing_lt_open(struct inode *inode, struct file *file) | |
1882 | { | |
1883 | struct trace_iterator *iter; | |
1884 | int ret; | |
1885 | ||
1886 | iter = __tracing_open(inode, file, &ret); | |
1887 | ||
1888 | if (!ret) | |
1889 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
1890 | ||
1891 | return ret; | |
1892 | } | |
1893 | ||
1894 | ||
e309b41d | 1895 | static void * |
bc0c38d1 SR |
1896 | t_next(struct seq_file *m, void *v, loff_t *pos) |
1897 | { | |
1898 | struct tracer *t = m->private; | |
1899 | ||
1900 | (*pos)++; | |
1901 | ||
1902 | if (t) | |
1903 | t = t->next; | |
1904 | ||
1905 | m->private = t; | |
1906 | ||
1907 | return t; | |
1908 | } | |
1909 | ||
1910 | static void *t_start(struct seq_file *m, loff_t *pos) | |
1911 | { | |
1912 | struct tracer *t = m->private; | |
1913 | loff_t l = 0; | |
1914 | ||
1915 | mutex_lock(&trace_types_lock); | |
1916 | for (; t && l < *pos; t = t_next(m, t, &l)) | |
1917 | ; | |
1918 | ||
1919 | return t; | |
1920 | } | |
1921 | ||
1922 | static void t_stop(struct seq_file *m, void *p) | |
1923 | { | |
1924 | mutex_unlock(&trace_types_lock); | |
1925 | } | |
1926 | ||
1927 | static int t_show(struct seq_file *m, void *v) | |
1928 | { | |
1929 | struct tracer *t = v; | |
1930 | ||
1931 | if (!t) | |
1932 | return 0; | |
1933 | ||
1934 | seq_printf(m, "%s", t->name); | |
1935 | if (t->next) | |
1936 | seq_putc(m, ' '); | |
1937 | else | |
1938 | seq_putc(m, '\n'); | |
1939 | ||
1940 | return 0; | |
1941 | } | |
1942 | ||
1943 | static struct seq_operations show_traces_seq_ops = { | |
4bf39a94 IM |
1944 | .start = t_start, |
1945 | .next = t_next, | |
1946 | .stop = t_stop, | |
1947 | .show = t_show, | |
bc0c38d1 SR |
1948 | }; |
1949 | ||
1950 | static int show_traces_open(struct inode *inode, struct file *file) | |
1951 | { | |
1952 | int ret; | |
1953 | ||
60a11774 SR |
1954 | if (tracing_disabled) |
1955 | return -ENODEV; | |
1956 | ||
bc0c38d1 SR |
1957 | ret = seq_open(file, &show_traces_seq_ops); |
1958 | if (!ret) { | |
1959 | struct seq_file *m = file->private_data; | |
1960 | m->private = trace_types; | |
1961 | } | |
1962 | ||
1963 | return ret; | |
1964 | } | |
1965 | ||
1966 | static struct file_operations tracing_fops = { | |
4bf39a94 IM |
1967 | .open = tracing_open, |
1968 | .read = seq_read, | |
1969 | .llseek = seq_lseek, | |
1970 | .release = tracing_release, | |
bc0c38d1 SR |
1971 | }; |
1972 | ||
1973 | static struct file_operations tracing_lt_fops = { | |
4bf39a94 IM |
1974 | .open = tracing_lt_open, |
1975 | .read = seq_read, | |
1976 | .llseek = seq_lseek, | |
1977 | .release = tracing_release, | |
bc0c38d1 SR |
1978 | }; |
1979 | ||
1980 | static struct file_operations show_traces_fops = { | |
c7078de1 IM |
1981 | .open = show_traces_open, |
1982 | .read = seq_read, | |
1983 | .release = seq_release, | |
1984 | }; | |
1985 | ||
36dfe925 IM |
1986 | /* |
1987 | * Only trace on a CPU if the bitmask is set: | |
1988 | */ | |
9e01c1b7 | 1989 | static cpumask_var_t tracing_cpumask; |
36dfe925 IM |
1990 | |
1991 | /* | |
1992 | * The tracer itself will not take this lock, but still we want | |
1993 | * to provide a consistent cpumask to user-space: | |
1994 | */ | |
1995 | static DEFINE_MUTEX(tracing_cpumask_update_lock); | |
1996 | ||
1997 | /* | |
1998 | * Temporary storage for the character representation of the | |
1999 | * CPU bitmask (and one more byte for the newline): | |
2000 | */ | |
2001 | static char mask_str[NR_CPUS + 1]; | |
2002 | ||
c7078de1 IM |
2003 | static ssize_t |
2004 | tracing_cpumask_read(struct file *filp, char __user *ubuf, | |
2005 | size_t count, loff_t *ppos) | |
2006 | { | |
36dfe925 | 2007 | int len; |
c7078de1 IM |
2008 | |
2009 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 | 2010 | |
9e01c1b7 | 2011 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); |
36dfe925 IM |
2012 | if (count - len < 2) { |
2013 | count = -EINVAL; | |
2014 | goto out_err; | |
2015 | } | |
2016 | len += sprintf(mask_str + len, "\n"); | |
2017 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); | |
2018 | ||
2019 | out_err: | |
c7078de1 IM |
2020 | mutex_unlock(&tracing_cpumask_update_lock); |
2021 | ||
2022 | return count; | |
2023 | } | |
2024 | ||
2025 | static ssize_t | |
2026 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, | |
2027 | size_t count, loff_t *ppos) | |
2028 | { | |
36dfe925 | 2029 | int err, cpu; |
9e01c1b7 RR |
2030 | cpumask_var_t tracing_cpumask_new; |
2031 | ||
2032 | if (!alloc_cpumask_var(&tracing_cpumask_new, GFP_KERNEL)) | |
2033 | return -ENOMEM; | |
c7078de1 IM |
2034 | |
2035 | mutex_lock(&tracing_cpumask_update_lock); | |
9e01c1b7 | 2036 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
c7078de1 | 2037 | if (err) |
36dfe925 IM |
2038 | goto err_unlock; |
2039 | ||
a5e25883 | 2040 | local_irq_disable(); |
92205c23 | 2041 | __raw_spin_lock(&ftrace_max_lock); |
ab46428c | 2042 | for_each_tracing_cpu(cpu) { |
36dfe925 IM |
2043 | /* |
2044 | * Increase/decrease the disabled counter if we are | |
2045 | * about to flip a bit in the cpumask: | |
2046 | */ | |
9e01c1b7 RR |
2047 | if (cpumask_test_cpu(cpu, tracing_cpumask) && |
2048 | !cpumask_test_cpu(cpu, tracing_cpumask_new)) { | |
36dfe925 IM |
2049 | atomic_inc(&global_trace.data[cpu]->disabled); |
2050 | } | |
9e01c1b7 RR |
2051 | if (!cpumask_test_cpu(cpu, tracing_cpumask) && |
2052 | cpumask_test_cpu(cpu, tracing_cpumask_new)) { | |
36dfe925 IM |
2053 | atomic_dec(&global_trace.data[cpu]->disabled); |
2054 | } | |
2055 | } | |
92205c23 | 2056 | __raw_spin_unlock(&ftrace_max_lock); |
a5e25883 | 2057 | local_irq_enable(); |
36dfe925 | 2058 | |
9e01c1b7 | 2059 | cpumask_copy(tracing_cpumask, tracing_cpumask_new); |
36dfe925 IM |
2060 | |
2061 | mutex_unlock(&tracing_cpumask_update_lock); | |
9e01c1b7 | 2062 | free_cpumask_var(tracing_cpumask_new); |
c7078de1 IM |
2063 | |
2064 | return count; | |
36dfe925 IM |
2065 | |
2066 | err_unlock: | |
2067 | mutex_unlock(&tracing_cpumask_update_lock); | |
9e01c1b7 | 2068 | free_cpumask_var(tracing_cpumask); |
36dfe925 IM |
2069 | |
2070 | return err; | |
c7078de1 IM |
2071 | } |
2072 | ||
2073 | static struct file_operations tracing_cpumask_fops = { | |
2074 | .open = tracing_open_generic, | |
2075 | .read = tracing_cpumask_read, | |
2076 | .write = tracing_cpumask_write, | |
bc0c38d1 SR |
2077 | }; |
2078 | ||
2079 | static ssize_t | |
ee6bce52 | 2080 | tracing_trace_options_read(struct file *filp, char __user *ubuf, |
bc0c38d1 SR |
2081 | size_t cnt, loff_t *ppos) |
2082 | { | |
adf9f195 | 2083 | int i; |
bc0c38d1 SR |
2084 | char *buf; |
2085 | int r = 0; | |
2086 | int len = 0; | |
adf9f195 FW |
2087 | u32 tracer_flags = current_trace->flags->val; |
2088 | struct tracer_opt *trace_opts = current_trace->flags->opts; | |
2089 | ||
bc0c38d1 SR |
2090 | |
2091 | /* calulate max size */ | |
2092 | for (i = 0; trace_options[i]; i++) { | |
2093 | len += strlen(trace_options[i]); | |
2094 | len += 3; /* "no" and space */ | |
2095 | } | |
2096 | ||
adf9f195 FW |
2097 | /* |
2098 | * Increase the size with names of options specific | |
2099 | * of the current tracer. | |
2100 | */ | |
2101 | for (i = 0; trace_opts[i].name; i++) { | |
2102 | len += strlen(trace_opts[i].name); | |
2103 | len += 3; /* "no" and space */ | |
2104 | } | |
2105 | ||
bc0c38d1 SR |
2106 | /* +2 for \n and \0 */ |
2107 | buf = kmalloc(len + 2, GFP_KERNEL); | |
2108 | if (!buf) | |
2109 | return -ENOMEM; | |
2110 | ||
2111 | for (i = 0; trace_options[i]; i++) { | |
2112 | if (trace_flags & (1 << i)) | |
2113 | r += sprintf(buf + r, "%s ", trace_options[i]); | |
2114 | else | |
2115 | r += sprintf(buf + r, "no%s ", trace_options[i]); | |
2116 | } | |
2117 | ||
adf9f195 FW |
2118 | for (i = 0; trace_opts[i].name; i++) { |
2119 | if (tracer_flags & trace_opts[i].bit) | |
2120 | r += sprintf(buf + r, "%s ", | |
2121 | trace_opts[i].name); | |
2122 | else | |
2123 | r += sprintf(buf + r, "no%s ", | |
2124 | trace_opts[i].name); | |
2125 | } | |
2126 | ||
bc0c38d1 SR |
2127 | r += sprintf(buf + r, "\n"); |
2128 | WARN_ON(r >= len + 2); | |
2129 | ||
36dfe925 | 2130 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2131 | |
2132 | kfree(buf); | |
2133 | ||
2134 | return r; | |
2135 | } | |
2136 | ||
adf9f195 FW |
2137 | /* Try to assign a tracer specific option */ |
2138 | static int set_tracer_option(struct tracer *trace, char *cmp, int neg) | |
2139 | { | |
2140 | struct tracer_flags *trace_flags = trace->flags; | |
2141 | struct tracer_opt *opts = NULL; | |
2142 | int ret = 0, i = 0; | |
2143 | int len; | |
2144 | ||
2145 | for (i = 0; trace_flags->opts[i].name; i++) { | |
2146 | opts = &trace_flags->opts[i]; | |
2147 | len = strlen(opts->name); | |
2148 | ||
2149 | if (strncmp(cmp, opts->name, len) == 0) { | |
2150 | ret = trace->set_flag(trace_flags->val, | |
2151 | opts->bit, !neg); | |
2152 | break; | |
2153 | } | |
2154 | } | |
2155 | /* Not found */ | |
2156 | if (!trace_flags->opts[i].name) | |
2157 | return -EINVAL; | |
2158 | ||
2159 | /* Refused to handle */ | |
2160 | if (ret) | |
2161 | return ret; | |
2162 | ||
2163 | if (neg) | |
2164 | trace_flags->val &= ~opts->bit; | |
2165 | else | |
2166 | trace_flags->val |= opts->bit; | |
2167 | ||
2168 | return 0; | |
2169 | } | |
2170 | ||
bc0c38d1 | 2171 | static ssize_t |
ee6bce52 | 2172 | tracing_trace_options_write(struct file *filp, const char __user *ubuf, |
bc0c38d1 SR |
2173 | size_t cnt, loff_t *ppos) |
2174 | { | |
2175 | char buf[64]; | |
2176 | char *cmp = buf; | |
2177 | int neg = 0; | |
adf9f195 | 2178 | int ret; |
bc0c38d1 SR |
2179 | int i; |
2180 | ||
cffae437 SR |
2181 | if (cnt >= sizeof(buf)) |
2182 | return -EINVAL; | |
bc0c38d1 SR |
2183 | |
2184 | if (copy_from_user(&buf, ubuf, cnt)) | |
2185 | return -EFAULT; | |
2186 | ||
2187 | buf[cnt] = 0; | |
2188 | ||
2189 | if (strncmp(buf, "no", 2) == 0) { | |
2190 | neg = 1; | |
2191 | cmp += 2; | |
2192 | } | |
2193 | ||
2194 | for (i = 0; trace_options[i]; i++) { | |
2195 | int len = strlen(trace_options[i]); | |
2196 | ||
2197 | if (strncmp(cmp, trace_options[i], len) == 0) { | |
2198 | if (neg) | |
2199 | trace_flags &= ~(1 << i); | |
2200 | else | |
2201 | trace_flags |= (1 << i); | |
2202 | break; | |
2203 | } | |
2204 | } | |
adf9f195 FW |
2205 | |
2206 | /* If no option could be set, test the specific tracer options */ | |
2207 | if (!trace_options[i]) { | |
2208 | ret = set_tracer_option(current_trace, cmp, neg); | |
2209 | if (ret) | |
2210 | return ret; | |
2211 | } | |
bc0c38d1 SR |
2212 | |
2213 | filp->f_pos += cnt; | |
2214 | ||
2215 | return cnt; | |
2216 | } | |
2217 | ||
2218 | static struct file_operations tracing_iter_fops = { | |
c7078de1 | 2219 | .open = tracing_open_generic, |
ee6bce52 SR |
2220 | .read = tracing_trace_options_read, |
2221 | .write = tracing_trace_options_write, | |
bc0c38d1 SR |
2222 | }; |
2223 | ||
7bd2f24c IM |
2224 | static const char readme_msg[] = |
2225 | "tracing mini-HOWTO:\n\n" | |
2226 | "# mkdir /debug\n" | |
2227 | "# mount -t debugfs nodev /debug\n\n" | |
2228 | "# cat /debug/tracing/available_tracers\n" | |
2229 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" | |
2230 | "# cat /debug/tracing/current_tracer\n" | |
2231 | "none\n" | |
2232 | "# echo sched_switch > /debug/tracing/current_tracer\n" | |
2233 | "# cat /debug/tracing/current_tracer\n" | |
2234 | "sched_switch\n" | |
ee6bce52 | 2235 | "# cat /debug/tracing/trace_options\n" |
7bd2f24c | 2236 | "noprint-parent nosym-offset nosym-addr noverbose\n" |
ee6bce52 | 2237 | "# echo print-parent > /debug/tracing/trace_options\n" |
7bd2f24c IM |
2238 | "# echo 1 > /debug/tracing/tracing_enabled\n" |
2239 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" | |
2240 | "echo 0 > /debug/tracing/tracing_enabled\n" | |
2241 | ; | |
2242 | ||
2243 | static ssize_t | |
2244 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
2245 | size_t cnt, loff_t *ppos) | |
2246 | { | |
2247 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
2248 | readme_msg, strlen(readme_msg)); | |
2249 | } | |
2250 | ||
2251 | static struct file_operations tracing_readme_fops = { | |
c7078de1 IM |
2252 | .open = tracing_open_generic, |
2253 | .read = tracing_readme_read, | |
7bd2f24c IM |
2254 | }; |
2255 | ||
bc0c38d1 SR |
2256 | static ssize_t |
2257 | tracing_ctrl_read(struct file *filp, char __user *ubuf, | |
2258 | size_t cnt, loff_t *ppos) | |
2259 | { | |
bc0c38d1 SR |
2260 | char buf[64]; |
2261 | int r; | |
2262 | ||
9036990d | 2263 | r = sprintf(buf, "%u\n", tracer_enabled); |
4e3c3333 | 2264 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2265 | } |
2266 | ||
2267 | static ssize_t | |
2268 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, | |
2269 | size_t cnt, loff_t *ppos) | |
2270 | { | |
2271 | struct trace_array *tr = filp->private_data; | |
bc0c38d1 | 2272 | char buf[64]; |
c6caeeb1 SR |
2273 | long val; |
2274 | int ret; | |
bc0c38d1 | 2275 | |
cffae437 SR |
2276 | if (cnt >= sizeof(buf)) |
2277 | return -EINVAL; | |
bc0c38d1 SR |
2278 | |
2279 | if (copy_from_user(&buf, ubuf, cnt)) | |
2280 | return -EFAULT; | |
2281 | ||
2282 | buf[cnt] = 0; | |
2283 | ||
c6caeeb1 SR |
2284 | ret = strict_strtoul(buf, 10, &val); |
2285 | if (ret < 0) | |
2286 | return ret; | |
bc0c38d1 SR |
2287 | |
2288 | val = !!val; | |
2289 | ||
2290 | mutex_lock(&trace_types_lock); | |
9036990d SR |
2291 | if (tracer_enabled ^ val) { |
2292 | if (val) { | |
bc0c38d1 | 2293 | tracer_enabled = 1; |
9036990d SR |
2294 | if (current_trace->start) |
2295 | current_trace->start(tr); | |
2296 | tracing_start(); | |
2297 | } else { | |
bc0c38d1 | 2298 | tracer_enabled = 0; |
9036990d SR |
2299 | tracing_stop(); |
2300 | if (current_trace->stop) | |
2301 | current_trace->stop(tr); | |
2302 | } | |
bc0c38d1 SR |
2303 | } |
2304 | mutex_unlock(&trace_types_lock); | |
2305 | ||
2306 | filp->f_pos += cnt; | |
2307 | ||
2308 | return cnt; | |
2309 | } | |
2310 | ||
2311 | static ssize_t | |
2312 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
2313 | size_t cnt, loff_t *ppos) | |
2314 | { | |
2315 | char buf[max_tracer_type_len+2]; | |
2316 | int r; | |
2317 | ||
2318 | mutex_lock(&trace_types_lock); | |
2319 | if (current_trace) | |
2320 | r = sprintf(buf, "%s\n", current_trace->name); | |
2321 | else | |
2322 | r = sprintf(buf, "\n"); | |
2323 | mutex_unlock(&trace_types_lock); | |
2324 | ||
4bf39a94 | 2325 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2326 | } |
2327 | ||
d9e54076 | 2328 | static int tracing_set_tracer(char *buf) |
bc0c38d1 SR |
2329 | { |
2330 | struct trace_array *tr = &global_trace; | |
2331 | struct tracer *t; | |
d9e54076 | 2332 | int ret = 0; |
bc0c38d1 SR |
2333 | |
2334 | mutex_lock(&trace_types_lock); | |
2335 | for (t = trace_types; t; t = t->next) { | |
2336 | if (strcmp(t->name, buf) == 0) | |
2337 | break; | |
2338 | } | |
c2931e05 FW |
2339 | if (!t) { |
2340 | ret = -EINVAL; | |
2341 | goto out; | |
2342 | } | |
2343 | if (t == current_trace) | |
bc0c38d1 SR |
2344 | goto out; |
2345 | ||
9f029e83 | 2346 | trace_branch_disable(); |
bc0c38d1 SR |
2347 | if (current_trace && current_trace->reset) |
2348 | current_trace->reset(tr); | |
2349 | ||
2350 | current_trace = t; | |
1c80025a FW |
2351 | if (t->init) { |
2352 | ret = t->init(tr); | |
2353 | if (ret) | |
2354 | goto out; | |
2355 | } | |
bc0c38d1 | 2356 | |
9f029e83 | 2357 | trace_branch_enable(tr); |
bc0c38d1 SR |
2358 | out: |
2359 | mutex_unlock(&trace_types_lock); | |
2360 | ||
d9e54076 PZ |
2361 | return ret; |
2362 | } | |
2363 | ||
2364 | static ssize_t | |
2365 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
2366 | size_t cnt, loff_t *ppos) | |
2367 | { | |
2368 | char buf[max_tracer_type_len+1]; | |
2369 | int i; | |
2370 | size_t ret; | |
e6e7a65a FW |
2371 | int err; |
2372 | ||
2373 | ret = cnt; | |
d9e54076 PZ |
2374 | |
2375 | if (cnt > max_tracer_type_len) | |
2376 | cnt = max_tracer_type_len; | |
2377 | ||
2378 | if (copy_from_user(&buf, ubuf, cnt)) | |
2379 | return -EFAULT; | |
2380 | ||
2381 | buf[cnt] = 0; | |
2382 | ||
2383 | /* strip ending whitespace. */ | |
2384 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
2385 | buf[i] = 0; | |
2386 | ||
e6e7a65a FW |
2387 | err = tracing_set_tracer(buf); |
2388 | if (err) | |
2389 | return err; | |
d9e54076 | 2390 | |
e6e7a65a | 2391 | filp->f_pos += ret; |
bc0c38d1 | 2392 | |
c2931e05 | 2393 | return ret; |
bc0c38d1 SR |
2394 | } |
2395 | ||
2396 | static ssize_t | |
2397 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
2398 | size_t cnt, loff_t *ppos) | |
2399 | { | |
2400 | unsigned long *ptr = filp->private_data; | |
2401 | char buf[64]; | |
2402 | int r; | |
2403 | ||
cffae437 | 2404 | r = snprintf(buf, sizeof(buf), "%ld\n", |
bc0c38d1 | 2405 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
cffae437 SR |
2406 | if (r > sizeof(buf)) |
2407 | r = sizeof(buf); | |
4bf39a94 | 2408 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2409 | } |
2410 | ||
2411 | static ssize_t | |
2412 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
2413 | size_t cnt, loff_t *ppos) | |
2414 | { | |
2415 | long *ptr = filp->private_data; | |
bc0c38d1 | 2416 | char buf[64]; |
c6caeeb1 SR |
2417 | long val; |
2418 | int ret; | |
bc0c38d1 | 2419 | |
cffae437 SR |
2420 | if (cnt >= sizeof(buf)) |
2421 | return -EINVAL; | |
bc0c38d1 SR |
2422 | |
2423 | if (copy_from_user(&buf, ubuf, cnt)) | |
2424 | return -EFAULT; | |
2425 | ||
2426 | buf[cnt] = 0; | |
2427 | ||
c6caeeb1 SR |
2428 | ret = strict_strtoul(buf, 10, &val); |
2429 | if (ret < 0) | |
2430 | return ret; | |
bc0c38d1 SR |
2431 | |
2432 | *ptr = val * 1000; | |
2433 | ||
2434 | return cnt; | |
2435 | } | |
2436 | ||
b3806b43 SR |
2437 | static atomic_t tracing_reader; |
2438 | ||
2439 | static int tracing_open_pipe(struct inode *inode, struct file *filp) | |
2440 | { | |
2441 | struct trace_iterator *iter; | |
2442 | ||
2443 | if (tracing_disabled) | |
2444 | return -ENODEV; | |
2445 | ||
2446 | /* We only allow for reader of the pipe */ | |
2447 | if (atomic_inc_return(&tracing_reader) != 1) { | |
2448 | atomic_dec(&tracing_reader); | |
2449 | return -EBUSY; | |
2450 | } | |
2451 | ||
2452 | /* create a buffer to store the information to pass to userspace */ | |
2453 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
2454 | if (!iter) | |
2455 | return -ENOMEM; | |
2456 | ||
4462344e RR |
2457 | if (!alloc_cpumask_var(&iter->started, GFP_KERNEL)) { |
2458 | kfree(iter); | |
2459 | return -ENOMEM; | |
2460 | } | |
2461 | ||
107bad8b | 2462 | mutex_lock(&trace_types_lock); |
a309720c SR |
2463 | |
2464 | /* trace pipe does not show start of buffer */ | |
4462344e | 2465 | cpumask_setall(iter->started); |
a309720c | 2466 | |
b3806b43 | 2467 | iter->tr = &global_trace; |
72829bc3 | 2468 | iter->trace = current_trace; |
b3806b43 SR |
2469 | filp->private_data = iter; |
2470 | ||
107bad8b SR |
2471 | if (iter->trace->pipe_open) |
2472 | iter->trace->pipe_open(iter); | |
2473 | mutex_unlock(&trace_types_lock); | |
2474 | ||
b3806b43 SR |
2475 | return 0; |
2476 | } | |
2477 | ||
2478 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
2479 | { | |
2480 | struct trace_iterator *iter = file->private_data; | |
2481 | ||
4462344e | 2482 | free_cpumask_var(iter->started); |
b3806b43 SR |
2483 | kfree(iter); |
2484 | atomic_dec(&tracing_reader); | |
2485 | ||
2486 | return 0; | |
2487 | } | |
2488 | ||
2a2cc8f7 SSP |
2489 | static unsigned int |
2490 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) | |
2491 | { | |
2492 | struct trace_iterator *iter = filp->private_data; | |
2493 | ||
2494 | if (trace_flags & TRACE_ITER_BLOCK) { | |
2495 | /* | |
2496 | * Always select as readable when in blocking mode | |
2497 | */ | |
2498 | return POLLIN | POLLRDNORM; | |
afc2abc0 | 2499 | } else { |
2a2cc8f7 SSP |
2500 | if (!trace_empty(iter)) |
2501 | return POLLIN | POLLRDNORM; | |
2502 | poll_wait(filp, &trace_wait, poll_table); | |
2503 | if (!trace_empty(iter)) | |
2504 | return POLLIN | POLLRDNORM; | |
2505 | ||
2506 | return 0; | |
2507 | } | |
2508 | } | |
2509 | ||
b3806b43 SR |
2510 | /* |
2511 | * Consumer reader. | |
2512 | */ | |
2513 | static ssize_t | |
2514 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
2515 | size_t cnt, loff_t *ppos) | |
2516 | { | |
2517 | struct trace_iterator *iter = filp->private_data; | |
6c6c2796 | 2518 | ssize_t sret; |
b3806b43 SR |
2519 | |
2520 | /* return any leftover data */ | |
6c6c2796 PP |
2521 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
2522 | if (sret != -EBUSY) | |
2523 | return sret; | |
b3806b43 | 2524 | |
6c6c2796 | 2525 | trace_seq_reset(&iter->seq); |
b3806b43 | 2526 | |
107bad8b SR |
2527 | mutex_lock(&trace_types_lock); |
2528 | if (iter->trace->read) { | |
6c6c2796 PP |
2529 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); |
2530 | if (sret) | |
107bad8b | 2531 | goto out; |
107bad8b SR |
2532 | } |
2533 | ||
9ff4b974 PP |
2534 | waitagain: |
2535 | sret = 0; | |
b3806b43 | 2536 | while (trace_empty(iter)) { |
2dc8f095 | 2537 | |
107bad8b | 2538 | if ((filp->f_flags & O_NONBLOCK)) { |
6c6c2796 | 2539 | sret = -EAGAIN; |
107bad8b SR |
2540 | goto out; |
2541 | } | |
2dc8f095 | 2542 | |
b3806b43 SR |
2543 | /* |
2544 | * This is a make-shift waitqueue. The reason we don't use | |
2545 | * an actual wait queue is because: | |
2546 | * 1) we only ever have one waiter | |
2547 | * 2) the tracing, traces all functions, we don't want | |
2548 | * the overhead of calling wake_up and friends | |
2549 | * (and tracing them too) | |
2550 | * Anyway, this is really very primitive wakeup. | |
2551 | */ | |
2552 | set_current_state(TASK_INTERRUPTIBLE); | |
2553 | iter->tr->waiter = current; | |
2554 | ||
107bad8b SR |
2555 | mutex_unlock(&trace_types_lock); |
2556 | ||
9fe068e9 IM |
2557 | /* sleep for 100 msecs, and try again. */ |
2558 | schedule_timeout(HZ/10); | |
b3806b43 | 2559 | |
107bad8b SR |
2560 | mutex_lock(&trace_types_lock); |
2561 | ||
b3806b43 SR |
2562 | iter->tr->waiter = NULL; |
2563 | ||
107bad8b | 2564 | if (signal_pending(current)) { |
6c6c2796 | 2565 | sret = -EINTR; |
107bad8b SR |
2566 | goto out; |
2567 | } | |
b3806b43 | 2568 | |
84527997 | 2569 | if (iter->trace != current_trace) |
107bad8b | 2570 | goto out; |
84527997 | 2571 | |
b3806b43 SR |
2572 | /* |
2573 | * We block until we read something and tracing is disabled. | |
2574 | * We still block if tracing is disabled, but we have never | |
2575 | * read anything. This allows a user to cat this file, and | |
2576 | * then enable tracing. But after we have read something, | |
2577 | * we give an EOF when tracing is again disabled. | |
2578 | * | |
2579 | * iter->pos will be 0 if we haven't read anything. | |
2580 | */ | |
2581 | if (!tracer_enabled && iter->pos) | |
2582 | break; | |
2583 | ||
2584 | continue; | |
2585 | } | |
2586 | ||
2587 | /* stop when tracing is finished */ | |
2588 | if (trace_empty(iter)) | |
107bad8b | 2589 | goto out; |
b3806b43 SR |
2590 | |
2591 | if (cnt >= PAGE_SIZE) | |
2592 | cnt = PAGE_SIZE - 1; | |
2593 | ||
53d0aa77 | 2594 | /* reset all but tr, trace, and overruns */ |
53d0aa77 SR |
2595 | memset(&iter->seq, 0, |
2596 | sizeof(struct trace_iterator) - | |
2597 | offsetof(struct trace_iterator, seq)); | |
4823ed7e | 2598 | iter->pos = -1; |
b3806b43 | 2599 | |
088b1e42 | 2600 | while (find_next_entry_inc(iter) != NULL) { |
2c4f035f | 2601 | enum print_line_t ret; |
088b1e42 SR |
2602 | int len = iter->seq.len; |
2603 | ||
f9896bf3 | 2604 | ret = print_trace_line(iter); |
2c4f035f | 2605 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
088b1e42 SR |
2606 | /* don't print partial lines */ |
2607 | iter->seq.len = len; | |
b3806b43 | 2608 | break; |
088b1e42 | 2609 | } |
b3806b43 SR |
2610 | |
2611 | trace_consume(iter); | |
2612 | ||
2613 | if (iter->seq.len >= cnt) | |
2614 | break; | |
b3806b43 SR |
2615 | } |
2616 | ||
b3806b43 | 2617 | /* Now copy what we have to the user */ |
6c6c2796 PP |
2618 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
2619 | if (iter->seq.readpos >= iter->seq.len) | |
b3806b43 | 2620 | trace_seq_reset(&iter->seq); |
9ff4b974 PP |
2621 | |
2622 | /* | |
2623 | * If there was nothing to send to user, inspite of consuming trace | |
2624 | * entries, go back to wait for more entries. | |
2625 | */ | |
6c6c2796 | 2626 | if (sret == -EBUSY) |
9ff4b974 | 2627 | goto waitagain; |
b3806b43 | 2628 | |
107bad8b SR |
2629 | out: |
2630 | mutex_unlock(&trace_types_lock); | |
2631 | ||
6c6c2796 | 2632 | return sret; |
b3806b43 SR |
2633 | } |
2634 | ||
a98a3c3f SR |
2635 | static ssize_t |
2636 | tracing_entries_read(struct file *filp, char __user *ubuf, | |
2637 | size_t cnt, loff_t *ppos) | |
2638 | { | |
2639 | struct trace_array *tr = filp->private_data; | |
2640 | char buf[64]; | |
2641 | int r; | |
2642 | ||
1696b2b0 | 2643 | r = sprintf(buf, "%lu\n", tr->entries >> 10); |
a98a3c3f SR |
2644 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
2645 | } | |
2646 | ||
2647 | static ssize_t | |
2648 | tracing_entries_write(struct file *filp, const char __user *ubuf, | |
2649 | size_t cnt, loff_t *ppos) | |
2650 | { | |
2651 | unsigned long val; | |
2652 | char buf[64]; | |
bf5e6519 | 2653 | int ret, cpu; |
a98a3c3f | 2654 | |
cffae437 SR |
2655 | if (cnt >= sizeof(buf)) |
2656 | return -EINVAL; | |
a98a3c3f SR |
2657 | |
2658 | if (copy_from_user(&buf, ubuf, cnt)) | |
2659 | return -EFAULT; | |
2660 | ||
2661 | buf[cnt] = 0; | |
2662 | ||
c6caeeb1 SR |
2663 | ret = strict_strtoul(buf, 10, &val); |
2664 | if (ret < 0) | |
2665 | return ret; | |
a98a3c3f SR |
2666 | |
2667 | /* must have at least 1 entry */ | |
2668 | if (!val) | |
2669 | return -EINVAL; | |
2670 | ||
2671 | mutex_lock(&trace_types_lock); | |
2672 | ||
c76f0694 | 2673 | tracing_stop(); |
a98a3c3f | 2674 | |
bf5e6519 SR |
2675 | /* disable all cpu buffers */ |
2676 | for_each_tracing_cpu(cpu) { | |
2677 | if (global_trace.data[cpu]) | |
2678 | atomic_inc(&global_trace.data[cpu]->disabled); | |
2679 | if (max_tr.data[cpu]) | |
2680 | atomic_inc(&max_tr.data[cpu]->disabled); | |
2681 | } | |
2682 | ||
1696b2b0 SR |
2683 | /* value is in KB */ |
2684 | val <<= 10; | |
2685 | ||
3928a8a2 SR |
2686 | if (val != global_trace.entries) { |
2687 | ret = ring_buffer_resize(global_trace.buffer, val); | |
2688 | if (ret < 0) { | |
2689 | cnt = ret; | |
3eefae99 SR |
2690 | goto out; |
2691 | } | |
2692 | ||
3928a8a2 SR |
2693 | ret = ring_buffer_resize(max_tr.buffer, val); |
2694 | if (ret < 0) { | |
2695 | int r; | |
2696 | cnt = ret; | |
2697 | r = ring_buffer_resize(global_trace.buffer, | |
2698 | global_trace.entries); | |
2699 | if (r < 0) { | |
2700 | /* AARGH! We are left with different | |
2701 | * size max buffer!!!! */ | |
2702 | WARN_ON(1); | |
2703 | tracing_disabled = 1; | |
a98a3c3f | 2704 | } |
3928a8a2 | 2705 | goto out; |
a98a3c3f | 2706 | } |
3eefae99 | 2707 | |
3928a8a2 | 2708 | global_trace.entries = val; |
a98a3c3f SR |
2709 | } |
2710 | ||
2711 | filp->f_pos += cnt; | |
2712 | ||
19384c03 SR |
2713 | /* If check pages failed, return ENOMEM */ |
2714 | if (tracing_disabled) | |
2715 | cnt = -ENOMEM; | |
a98a3c3f | 2716 | out: |
bf5e6519 SR |
2717 | for_each_tracing_cpu(cpu) { |
2718 | if (global_trace.data[cpu]) | |
2719 | atomic_dec(&global_trace.data[cpu]->disabled); | |
2720 | if (max_tr.data[cpu]) | |
2721 | atomic_dec(&max_tr.data[cpu]->disabled); | |
2722 | } | |
2723 | ||
c76f0694 | 2724 | tracing_start(); |
a98a3c3f SR |
2725 | max_tr.entries = global_trace.entries; |
2726 | mutex_unlock(&trace_types_lock); | |
2727 | ||
2728 | return cnt; | |
2729 | } | |
2730 | ||
5bf9a1ee PP |
2731 | static int mark_printk(const char *fmt, ...) |
2732 | { | |
2733 | int ret; | |
2734 | va_list args; | |
2735 | va_start(args, fmt); | |
1fd8f2a3 | 2736 | ret = trace_vprintk(0, -1, fmt, args); |
5bf9a1ee PP |
2737 | va_end(args); |
2738 | return ret; | |
2739 | } | |
2740 | ||
2741 | static ssize_t | |
2742 | tracing_mark_write(struct file *filp, const char __user *ubuf, | |
2743 | size_t cnt, loff_t *fpos) | |
2744 | { | |
2745 | char *buf; | |
2746 | char *end; | |
5bf9a1ee | 2747 | |
c76f0694 | 2748 | if (tracing_disabled) |
5bf9a1ee PP |
2749 | return -EINVAL; |
2750 | ||
2751 | if (cnt > TRACE_BUF_SIZE) | |
2752 | cnt = TRACE_BUF_SIZE; | |
2753 | ||
2754 | buf = kmalloc(cnt + 1, GFP_KERNEL); | |
2755 | if (buf == NULL) | |
2756 | return -ENOMEM; | |
2757 | ||
2758 | if (copy_from_user(buf, ubuf, cnt)) { | |
2759 | kfree(buf); | |
2760 | return -EFAULT; | |
2761 | } | |
2762 | ||
2763 | /* Cut from the first nil or newline. */ | |
2764 | buf[cnt] = '\0'; | |
2765 | end = strchr(buf, '\n'); | |
2766 | if (end) | |
2767 | *end = '\0'; | |
2768 | ||
2769 | cnt = mark_printk("%s\n", buf); | |
2770 | kfree(buf); | |
2771 | *fpos += cnt; | |
2772 | ||
2773 | return cnt; | |
2774 | } | |
2775 | ||
bc0c38d1 | 2776 | static struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
2777 | .open = tracing_open_generic, |
2778 | .read = tracing_max_lat_read, | |
2779 | .write = tracing_max_lat_write, | |
bc0c38d1 SR |
2780 | }; |
2781 | ||
2782 | static struct file_operations tracing_ctrl_fops = { | |
4bf39a94 IM |
2783 | .open = tracing_open_generic, |
2784 | .read = tracing_ctrl_read, | |
2785 | .write = tracing_ctrl_write, | |
bc0c38d1 SR |
2786 | }; |
2787 | ||
2788 | static struct file_operations set_tracer_fops = { | |
4bf39a94 IM |
2789 | .open = tracing_open_generic, |
2790 | .read = tracing_set_trace_read, | |
2791 | .write = tracing_set_trace_write, | |
bc0c38d1 SR |
2792 | }; |
2793 | ||
b3806b43 | 2794 | static struct file_operations tracing_pipe_fops = { |
4bf39a94 | 2795 | .open = tracing_open_pipe, |
2a2cc8f7 | 2796 | .poll = tracing_poll_pipe, |
4bf39a94 IM |
2797 | .read = tracing_read_pipe, |
2798 | .release = tracing_release_pipe, | |
b3806b43 SR |
2799 | }; |
2800 | ||
a98a3c3f SR |
2801 | static struct file_operations tracing_entries_fops = { |
2802 | .open = tracing_open_generic, | |
2803 | .read = tracing_entries_read, | |
2804 | .write = tracing_entries_write, | |
2805 | }; | |
2806 | ||
5bf9a1ee | 2807 | static struct file_operations tracing_mark_fops = { |
43a15386 | 2808 | .open = tracing_open_generic, |
5bf9a1ee PP |
2809 | .write = tracing_mark_write, |
2810 | }; | |
2811 | ||
bc0c38d1 SR |
2812 | #ifdef CONFIG_DYNAMIC_FTRACE |
2813 | ||
b807c3d0 SR |
2814 | int __weak ftrace_arch_read_dyn_info(char *buf, int size) |
2815 | { | |
2816 | return 0; | |
2817 | } | |
2818 | ||
bc0c38d1 | 2819 | static ssize_t |
b807c3d0 | 2820 | tracing_read_dyn_info(struct file *filp, char __user *ubuf, |
bc0c38d1 SR |
2821 | size_t cnt, loff_t *ppos) |
2822 | { | |
a26a2a27 SR |
2823 | static char ftrace_dyn_info_buffer[1024]; |
2824 | static DEFINE_MUTEX(dyn_info_mutex); | |
bc0c38d1 | 2825 | unsigned long *p = filp->private_data; |
b807c3d0 | 2826 | char *buf = ftrace_dyn_info_buffer; |
a26a2a27 | 2827 | int size = ARRAY_SIZE(ftrace_dyn_info_buffer); |
bc0c38d1 SR |
2828 | int r; |
2829 | ||
b807c3d0 SR |
2830 | mutex_lock(&dyn_info_mutex); |
2831 | r = sprintf(buf, "%ld ", *p); | |
4bf39a94 | 2832 | |
a26a2a27 | 2833 | r += ftrace_arch_read_dyn_info(buf+r, (size-1)-r); |
b807c3d0 SR |
2834 | buf[r++] = '\n'; |
2835 | ||
2836 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
2837 | ||
2838 | mutex_unlock(&dyn_info_mutex); | |
2839 | ||
2840 | return r; | |
bc0c38d1 SR |
2841 | } |
2842 | ||
b807c3d0 | 2843 | static struct file_operations tracing_dyn_info_fops = { |
4bf39a94 | 2844 | .open = tracing_open_generic, |
b807c3d0 | 2845 | .read = tracing_read_dyn_info, |
bc0c38d1 SR |
2846 | }; |
2847 | #endif | |
2848 | ||
2849 | static struct dentry *d_tracer; | |
2850 | ||
2851 | struct dentry *tracing_init_dentry(void) | |
2852 | { | |
2853 | static int once; | |
2854 | ||
2855 | if (d_tracer) | |
2856 | return d_tracer; | |
2857 | ||
2858 | d_tracer = debugfs_create_dir("tracing", NULL); | |
2859 | ||
2860 | if (!d_tracer && !once) { | |
2861 | once = 1; | |
2862 | pr_warning("Could not create debugfs directory 'tracing'\n"); | |
2863 | return NULL; | |
2864 | } | |
2865 | ||
2866 | return d_tracer; | |
2867 | } | |
2868 | ||
60a11774 SR |
2869 | #ifdef CONFIG_FTRACE_SELFTEST |
2870 | /* Let selftest have access to static functions in this file */ | |
2871 | #include "trace_selftest.c" | |
2872 | #endif | |
2873 | ||
b5ad384e | 2874 | static __init int tracer_init_debugfs(void) |
bc0c38d1 SR |
2875 | { |
2876 | struct dentry *d_tracer; | |
2877 | struct dentry *entry; | |
2878 | ||
2879 | d_tracer = tracing_init_dentry(); | |
2880 | ||
2881 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, | |
2882 | &global_trace, &tracing_ctrl_fops); | |
2883 | if (!entry) | |
2884 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); | |
2885 | ||
ee6bce52 | 2886 | entry = debugfs_create_file("trace_options", 0644, d_tracer, |
bc0c38d1 SR |
2887 | NULL, &tracing_iter_fops); |
2888 | if (!entry) | |
ee6bce52 | 2889 | pr_warning("Could not create debugfs 'trace_options' entry\n"); |
bc0c38d1 | 2890 | |
c7078de1 IM |
2891 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
2892 | NULL, &tracing_cpumask_fops); | |
2893 | if (!entry) | |
2894 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); | |
2895 | ||
bc0c38d1 SR |
2896 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
2897 | &global_trace, &tracing_lt_fops); | |
2898 | if (!entry) | |
2899 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); | |
2900 | ||
2901 | entry = debugfs_create_file("trace", 0444, d_tracer, | |
2902 | &global_trace, &tracing_fops); | |
2903 | if (!entry) | |
2904 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2905 | ||
2906 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, | |
2907 | &global_trace, &show_traces_fops); | |
2908 | if (!entry) | |
98a983aa | 2909 | pr_warning("Could not create debugfs 'available_tracers' entry\n"); |
bc0c38d1 SR |
2910 | |
2911 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, | |
2912 | &global_trace, &set_tracer_fops); | |
2913 | if (!entry) | |
98a983aa | 2914 | pr_warning("Could not create debugfs 'current_tracer' entry\n"); |
bc0c38d1 SR |
2915 | |
2916 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, | |
2917 | &tracing_max_latency, | |
2918 | &tracing_max_lat_fops); | |
2919 | if (!entry) | |
2920 | pr_warning("Could not create debugfs " | |
2921 | "'tracing_max_latency' entry\n"); | |
2922 | ||
2923 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, | |
2924 | &tracing_thresh, &tracing_max_lat_fops); | |
2925 | if (!entry) | |
2926 | pr_warning("Could not create debugfs " | |
98a983aa | 2927 | "'tracing_thresh' entry\n"); |
7bd2f24c IM |
2928 | entry = debugfs_create_file("README", 0644, d_tracer, |
2929 | NULL, &tracing_readme_fops); | |
2930 | if (!entry) | |
2931 | pr_warning("Could not create debugfs 'README' entry\n"); | |
2932 | ||
b3806b43 SR |
2933 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
2934 | NULL, &tracing_pipe_fops); | |
2935 | if (!entry) | |
2936 | pr_warning("Could not create debugfs " | |
98a983aa | 2937 | "'trace_pipe' entry\n"); |
bc0c38d1 | 2938 | |
a94c80e7 | 2939 | entry = debugfs_create_file("buffer_size_kb", 0644, d_tracer, |
a98a3c3f SR |
2940 | &global_trace, &tracing_entries_fops); |
2941 | if (!entry) | |
2942 | pr_warning("Could not create debugfs " | |
a94c80e7 | 2943 | "'buffer_size_kb' entry\n"); |
a98a3c3f | 2944 | |
5bf9a1ee PP |
2945 | entry = debugfs_create_file("trace_marker", 0220, d_tracer, |
2946 | NULL, &tracing_mark_fops); | |
2947 | if (!entry) | |
2948 | pr_warning("Could not create debugfs " | |
2949 | "'trace_marker' entry\n"); | |
2950 | ||
bc0c38d1 SR |
2951 | #ifdef CONFIG_DYNAMIC_FTRACE |
2952 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, | |
2953 | &ftrace_update_tot_cnt, | |
b807c3d0 | 2954 | &tracing_dyn_info_fops); |
bc0c38d1 SR |
2955 | if (!entry) |
2956 | pr_warning("Could not create debugfs " | |
2957 | "'dyn_ftrace_total_info' entry\n"); | |
2958 | #endif | |
d618b3e6 IM |
2959 | #ifdef CONFIG_SYSPROF_TRACER |
2960 | init_tracer_sysprof_debugfs(d_tracer); | |
2961 | #endif | |
b5ad384e | 2962 | return 0; |
bc0c38d1 SR |
2963 | } |
2964 | ||
1fd8f2a3 | 2965 | int trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args) |
dd0e545f | 2966 | { |
dd0e545f SR |
2967 | static DEFINE_SPINLOCK(trace_buf_lock); |
2968 | static char trace_buf[TRACE_BUF_SIZE]; | |
f09ce573 | 2969 | |
3928a8a2 | 2970 | struct ring_buffer_event *event; |
f09ce573 | 2971 | struct trace_array *tr = &global_trace; |
dd0e545f | 2972 | struct trace_array_cpu *data; |
38697053 | 2973 | int cpu, len = 0, size, pc; |
e726f5f9 IM |
2974 | struct print_entry *entry; |
2975 | unsigned long irq_flags; | |
dd0e545f | 2976 | |
8e1b82e0 | 2977 | if (tracing_disabled || tracing_selftest_running) |
dd0e545f SR |
2978 | return 0; |
2979 | ||
38697053 SR |
2980 | pc = preempt_count(); |
2981 | preempt_disable_notrace(); | |
dd0e545f SR |
2982 | cpu = raw_smp_processor_id(); |
2983 | data = tr->data[cpu]; | |
dd0e545f | 2984 | |
3ea2e6d7 | 2985 | if (unlikely(atomic_read(&data->disabled))) |
dd0e545f SR |
2986 | goto out; |
2987 | ||
380c4b14 FW |
2988 | pause_graph_tracing(); |
2989 | spin_lock_irqsave(&trace_buf_lock, irq_flags); | |
801fe400 | 2990 | len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args); |
dd0e545f SR |
2991 | |
2992 | len = min(len, TRACE_BUF_SIZE-1); | |
2993 | trace_buf[len] = 0; | |
2994 | ||
777e208d SR |
2995 | size = sizeof(*entry) + len + 1; |
2996 | event = ring_buffer_lock_reserve(tr->buffer, size, &irq_flags); | |
3928a8a2 SR |
2997 | if (!event) |
2998 | goto out_unlock; | |
777e208d | 2999 | entry = ring_buffer_event_data(event); |
e726f5f9 | 3000 | tracing_generic_entry_update(&entry->ent, irq_flags, pc); |
777e208d SR |
3001 | entry->ent.type = TRACE_PRINT; |
3002 | entry->ip = ip; | |
1fd8f2a3 | 3003 | entry->depth = depth; |
dd0e545f | 3004 | |
777e208d SR |
3005 | memcpy(&entry->buf, trace_buf, len); |
3006 | entry->buf[len] = 0; | |
3928a8a2 | 3007 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
dd0e545f | 3008 | |
3928a8a2 | 3009 | out_unlock: |
380c4b14 FW |
3010 | spin_unlock_irqrestore(&trace_buf_lock, irq_flags); |
3011 | unpause_graph_tracing(); | |
dd0e545f | 3012 | out: |
38697053 | 3013 | preempt_enable_notrace(); |
dd0e545f SR |
3014 | |
3015 | return len; | |
3016 | } | |
801fe400 PP |
3017 | EXPORT_SYMBOL_GPL(trace_vprintk); |
3018 | ||
3019 | int __ftrace_printk(unsigned long ip, const char *fmt, ...) | |
3020 | { | |
3021 | int ret; | |
3022 | va_list ap; | |
3023 | ||
3024 | if (!(trace_flags & TRACE_ITER_PRINTK)) | |
3025 | return 0; | |
3026 | ||
3027 | va_start(ap, fmt); | |
21a8c466 | 3028 | ret = trace_vprintk(ip, task_curr_ret_stack(current), fmt, ap); |
801fe400 PP |
3029 | va_end(ap); |
3030 | return ret; | |
3031 | } | |
dd0e545f SR |
3032 | EXPORT_SYMBOL_GPL(__ftrace_printk); |
3033 | ||
3f5a54e3 SR |
3034 | static int trace_panic_handler(struct notifier_block *this, |
3035 | unsigned long event, void *unused) | |
3036 | { | |
944ac425 SR |
3037 | if (ftrace_dump_on_oops) |
3038 | ftrace_dump(); | |
3f5a54e3 SR |
3039 | return NOTIFY_OK; |
3040 | } | |
3041 | ||
3042 | static struct notifier_block trace_panic_notifier = { | |
3043 | .notifier_call = trace_panic_handler, | |
3044 | .next = NULL, | |
3045 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ | |
3046 | }; | |
3047 | ||
3048 | static int trace_die_handler(struct notifier_block *self, | |
3049 | unsigned long val, | |
3050 | void *data) | |
3051 | { | |
3052 | switch (val) { | |
3053 | case DIE_OOPS: | |
944ac425 SR |
3054 | if (ftrace_dump_on_oops) |
3055 | ftrace_dump(); | |
3f5a54e3 SR |
3056 | break; |
3057 | default: | |
3058 | break; | |
3059 | } | |
3060 | return NOTIFY_OK; | |
3061 | } | |
3062 | ||
3063 | static struct notifier_block trace_die_notifier = { | |
3064 | .notifier_call = trace_die_handler, | |
3065 | .priority = 200 | |
3066 | }; | |
3067 | ||
3068 | /* | |
3069 | * printk is set to max of 1024, we really don't need it that big. | |
3070 | * Nothing should be printing 1000 characters anyway. | |
3071 | */ | |
3072 | #define TRACE_MAX_PRINT 1000 | |
3073 | ||
3074 | /* | |
3075 | * Define here KERN_TRACE so that we have one place to modify | |
3076 | * it if we decide to change what log level the ftrace dump | |
3077 | * should be at. | |
3078 | */ | |
3079 | #define KERN_TRACE KERN_INFO | |
3080 | ||
3081 | static void | |
3082 | trace_printk_seq(struct trace_seq *s) | |
3083 | { | |
3084 | /* Probably should print a warning here. */ | |
3085 | if (s->len >= 1000) | |
3086 | s->len = 1000; | |
3087 | ||
3088 | /* should be zero ended, but we are paranoid. */ | |
3089 | s->buffer[s->len] = 0; | |
3090 | ||
3091 | printk(KERN_TRACE "%s", s->buffer); | |
3092 | ||
3093 | trace_seq_reset(s); | |
3094 | } | |
3095 | ||
3f5a54e3 SR |
3096 | void ftrace_dump(void) |
3097 | { | |
3098 | static DEFINE_SPINLOCK(ftrace_dump_lock); | |
3099 | /* use static because iter can be a bit big for the stack */ | |
3100 | static struct trace_iterator iter; | |
3f5a54e3 | 3101 | static int dump_ran; |
d769041f SR |
3102 | unsigned long flags; |
3103 | int cnt = 0, cpu; | |
3f5a54e3 SR |
3104 | |
3105 | /* only one dump */ | |
3106 | spin_lock_irqsave(&ftrace_dump_lock, flags); | |
3107 | if (dump_ran) | |
3108 | goto out; | |
3109 | ||
3110 | dump_ran = 1; | |
3111 | ||
3112 | /* No turning back! */ | |
81adbdc0 | 3113 | ftrace_kill(); |
3f5a54e3 | 3114 | |
d769041f SR |
3115 | for_each_tracing_cpu(cpu) { |
3116 | atomic_inc(&global_trace.data[cpu]->disabled); | |
3117 | } | |
3118 | ||
b54d3de9 TE |
3119 | /* don't look at user memory in panic mode */ |
3120 | trace_flags &= ~TRACE_ITER_SYM_USEROBJ; | |
3121 | ||
3f5a54e3 SR |
3122 | printk(KERN_TRACE "Dumping ftrace buffer:\n"); |
3123 | ||
3124 | iter.tr = &global_trace; | |
3125 | iter.trace = current_trace; | |
3126 | ||
3127 | /* | |
3128 | * We need to stop all tracing on all CPUS to read the | |
3129 | * the next buffer. This is a bit expensive, but is | |
3130 | * not done often. We fill all what we can read, | |
3131 | * and then release the locks again. | |
3132 | */ | |
3133 | ||
3f5a54e3 SR |
3134 | while (!trace_empty(&iter)) { |
3135 | ||
3136 | if (!cnt) | |
3137 | printk(KERN_TRACE "---------------------------------\n"); | |
3138 | ||
3139 | cnt++; | |
3140 | ||
3141 | /* reset all but tr, trace, and overruns */ | |
3142 | memset(&iter.seq, 0, | |
3143 | sizeof(struct trace_iterator) - | |
3144 | offsetof(struct trace_iterator, seq)); | |
3145 | iter.iter_flags |= TRACE_FILE_LAT_FMT; | |
3146 | iter.pos = -1; | |
3147 | ||
3148 | if (find_next_entry_inc(&iter) != NULL) { | |
3149 | print_trace_line(&iter); | |
3150 | trace_consume(&iter); | |
3151 | } | |
3152 | ||
3153 | trace_printk_seq(&iter.seq); | |
3154 | } | |
3155 | ||
3156 | if (!cnt) | |
3157 | printk(KERN_TRACE " (ftrace buffer empty)\n"); | |
3158 | else | |
3159 | printk(KERN_TRACE "---------------------------------\n"); | |
3160 | ||
3f5a54e3 SR |
3161 | out: |
3162 | spin_unlock_irqrestore(&ftrace_dump_lock, flags); | |
3163 | } | |
3164 | ||
3928a8a2 | 3165 | __init static int tracer_alloc_buffers(void) |
bc0c38d1 | 3166 | { |
4c11d7ae | 3167 | struct trace_array_cpu *data; |
4c11d7ae | 3168 | int i; |
9e01c1b7 | 3169 | int ret = -ENOMEM; |
4c11d7ae | 3170 | |
9e01c1b7 RR |
3171 | if (!alloc_cpumask_var(&tracing_buffer_mask, GFP_KERNEL)) |
3172 | goto out; | |
3173 | ||
3174 | if (!alloc_cpumask_var(&tracing_cpumask, GFP_KERNEL)) | |
3175 | goto out_free_buffer_mask; | |
4c11d7ae | 3176 | |
9e01c1b7 RR |
3177 | cpumask_copy(tracing_buffer_mask, cpu_possible_mask); |
3178 | cpumask_copy(tracing_cpumask, cpu_all_mask); | |
3179 | ||
3180 | /* TODO: make the number of buffers hot pluggable with CPUS */ | |
3928a8a2 SR |
3181 | global_trace.buffer = ring_buffer_alloc(trace_buf_size, |
3182 | TRACE_BUFFER_FLAGS); | |
3183 | if (!global_trace.buffer) { | |
3184 | printk(KERN_ERR "tracer: failed to allocate ring buffer!\n"); | |
3185 | WARN_ON(1); | |
9e01c1b7 | 3186 | goto out_free_cpumask; |
4c11d7ae | 3187 | } |
3928a8a2 | 3188 | global_trace.entries = ring_buffer_size(global_trace.buffer); |
4c11d7ae | 3189 | |
9e01c1b7 | 3190 | |
4c11d7ae | 3191 | #ifdef CONFIG_TRACER_MAX_TRACE |
3928a8a2 SR |
3192 | max_tr.buffer = ring_buffer_alloc(trace_buf_size, |
3193 | TRACE_BUFFER_FLAGS); | |
3194 | if (!max_tr.buffer) { | |
3195 | printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n"); | |
3196 | WARN_ON(1); | |
3197 | ring_buffer_free(global_trace.buffer); | |
9e01c1b7 | 3198 | goto out_free_cpumask; |
4c11d7ae | 3199 | } |
3928a8a2 SR |
3200 | max_tr.entries = ring_buffer_size(max_tr.buffer); |
3201 | WARN_ON(max_tr.entries != global_trace.entries); | |
a98a3c3f | 3202 | #endif |
ab46428c | 3203 | |
4c11d7ae | 3204 | /* Allocate the first page for all buffers */ |
ab46428c | 3205 | for_each_tracing_cpu(i) { |
4c11d7ae | 3206 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
bc0c38d1 | 3207 | max_tr.data[i] = &per_cpu(max_data, i); |
4c11d7ae | 3208 | } |
bc0c38d1 | 3209 | |
bc0c38d1 SR |
3210 | trace_init_cmdlines(); |
3211 | ||
43a15386 | 3212 | register_tracer(&nop_trace); |
b5ad384e FW |
3213 | #ifdef CONFIG_BOOT_TRACER |
3214 | register_tracer(&boot_tracer); | |
3215 | current_trace = &boot_tracer; | |
3216 | current_trace->init(&global_trace); | |
3217 | #else | |
43a15386 | 3218 | current_trace = &nop_trace; |
b5ad384e | 3219 | #endif |
60a11774 SR |
3220 | /* All seems OK, enable tracing */ |
3221 | tracing_disabled = 0; | |
3928a8a2 | 3222 | |
3f5a54e3 SR |
3223 | atomic_notifier_chain_register(&panic_notifier_list, |
3224 | &trace_panic_notifier); | |
3225 | ||
3226 | register_die_notifier(&trace_die_notifier); | |
9e01c1b7 | 3227 | ret = 0; |
3f5a54e3 | 3228 | |
9e01c1b7 RR |
3229 | out_free_cpumask: |
3230 | free_cpumask_var(tracing_cpumask); | |
3231 | out_free_buffer_mask: | |
3232 | free_cpumask_var(tracing_buffer_mask); | |
3233 | out: | |
3234 | return ret; | |
bc0c38d1 | 3235 | } |
b5ad384e FW |
3236 | early_initcall(tracer_alloc_buffers); |
3237 | fs_initcall(tracer_init_debugfs); |