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> |
3c56819b | 34 | #include <linux/splice.h> |
bc0c38d1 | 35 | |
86387f7e | 36 | #include <linux/stacktrace.h> |
3928a8a2 | 37 | #include <linux/ring_buffer.h> |
21798a84 | 38 | #include <linux/irqflags.h> |
86387f7e | 39 | |
bc0c38d1 | 40 | #include "trace.h" |
f0868d1e | 41 | #include "trace_output.h" |
bc0c38d1 | 42 | |
3928a8a2 SR |
43 | #define TRACE_BUFFER_FLAGS (RB_FL_OVERWRITE) |
44 | ||
745b1626 | 45 | unsigned long __read_mostly tracing_max_latency; |
bc0c38d1 SR |
46 | unsigned long __read_mostly tracing_thresh; |
47 | ||
8e1b82e0 FW |
48 | /* |
49 | * We need to change this state when a selftest is running. | |
ff32504f FW |
50 | * A selftest will lurk into the ring-buffer to count the |
51 | * entries inserted during the selftest although some concurrent | |
52 | * insertions into the ring-buffer such as ftrace_printk could occurred | |
53 | * at the same time, giving false positive or negative results. | |
54 | */ | |
8e1b82e0 | 55 | static bool __read_mostly tracing_selftest_running; |
ff32504f | 56 | |
b2821ae6 SR |
57 | /* |
58 | * If a tracer is running, we do not want to run SELFTEST. | |
59 | */ | |
60 | static bool __read_mostly tracing_selftest_disabled; | |
61 | ||
adf9f195 FW |
62 | /* For tracers that don't implement custom flags */ |
63 | static struct tracer_opt dummy_tracer_opt[] = { | |
64 | { } | |
65 | }; | |
66 | ||
67 | static struct tracer_flags dummy_tracer_flags = { | |
68 | .val = 0, | |
69 | .opts = dummy_tracer_opt | |
70 | }; | |
71 | ||
72 | static int dummy_set_flag(u32 old_flags, u32 bit, int set) | |
73 | { | |
74 | return 0; | |
75 | } | |
0f048701 SR |
76 | |
77 | /* | |
78 | * Kill all tracing for good (never come back). | |
79 | * It is initialized to 1 but will turn to zero if the initialization | |
80 | * of the tracer is successful. But that is the only place that sets | |
81 | * this back to zero. | |
82 | */ | |
4fd27358 | 83 | static int tracing_disabled = 1; |
0f048701 | 84 | |
d769041f SR |
85 | static DEFINE_PER_CPU(local_t, ftrace_cpu_disabled); |
86 | ||
87 | static inline void ftrace_disable_cpu(void) | |
88 | { | |
89 | preempt_disable(); | |
90 | local_inc(&__get_cpu_var(ftrace_cpu_disabled)); | |
91 | } | |
92 | ||
93 | static inline void ftrace_enable_cpu(void) | |
94 | { | |
95 | local_dec(&__get_cpu_var(ftrace_cpu_disabled)); | |
96 | preempt_enable(); | |
97 | } | |
98 | ||
9e01c1b7 | 99 | static cpumask_var_t __read_mostly tracing_buffer_mask; |
ab46428c SR |
100 | |
101 | #define for_each_tracing_cpu(cpu) \ | |
9e01c1b7 | 102 | for_each_cpu(cpu, tracing_buffer_mask) |
ab46428c | 103 | |
944ac425 SR |
104 | /* |
105 | * ftrace_dump_on_oops - variable to dump ftrace buffer on oops | |
106 | * | |
107 | * If there is an oops (or kernel panic) and the ftrace_dump_on_oops | |
108 | * is set, then ftrace_dump is called. This will output the contents | |
109 | * of the ftrace buffers to the console. This is very useful for | |
110 | * capturing traces that lead to crashes and outputing it to a | |
111 | * serial console. | |
112 | * | |
113 | * It is default off, but you can enable it with either specifying | |
114 | * "ftrace_dump_on_oops" in the kernel command line, or setting | |
115 | * /proc/sys/kernel/ftrace_dump_on_oops to true. | |
116 | */ | |
117 | int ftrace_dump_on_oops; | |
118 | ||
b2821ae6 SR |
119 | static int tracing_set_tracer(const char *buf); |
120 | ||
121 | #define BOOTUP_TRACER_SIZE 100 | |
122 | static char bootup_tracer_buf[BOOTUP_TRACER_SIZE] __initdata; | |
123 | static char *default_bootup_tracer; | |
d9e54076 PZ |
124 | |
125 | static int __init set_ftrace(char *str) | |
126 | { | |
b2821ae6 SR |
127 | strncpy(bootup_tracer_buf, str, BOOTUP_TRACER_SIZE); |
128 | default_bootup_tracer = bootup_tracer_buf; | |
d9e54076 PZ |
129 | return 1; |
130 | } | |
b2821ae6 | 131 | __setup("ftrace=", set_ftrace); |
d9e54076 | 132 | |
944ac425 SR |
133 | static int __init set_ftrace_dump_on_oops(char *str) |
134 | { | |
135 | ftrace_dump_on_oops = 1; | |
136 | return 1; | |
137 | } | |
138 | __setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops); | |
60a11774 | 139 | |
72829bc3 | 140 | long |
bc0c38d1 SR |
141 | ns2usecs(cycle_t nsec) |
142 | { | |
143 | nsec += 500; | |
144 | do_div(nsec, 1000); | |
145 | return nsec; | |
146 | } | |
147 | ||
e309b41d | 148 | cycle_t ftrace_now(int cpu) |
750ed1a4 | 149 | { |
3928a8a2 SR |
150 | u64 ts = ring_buffer_time_stamp(cpu); |
151 | ring_buffer_normalize_time_stamp(cpu, &ts); | |
152 | return ts; | |
750ed1a4 IM |
153 | } |
154 | ||
4fcdae83 SR |
155 | /* |
156 | * The global_trace is the descriptor that holds the tracing | |
157 | * buffers for the live tracing. For each CPU, it contains | |
158 | * a link list of pages that will store trace entries. The | |
159 | * page descriptor of the pages in the memory is used to hold | |
160 | * the link list by linking the lru item in the page descriptor | |
161 | * to each of the pages in the buffer per CPU. | |
162 | * | |
163 | * For each active CPU there is a data field that holds the | |
164 | * pages for the buffer for that CPU. Each CPU has the same number | |
165 | * of pages allocated for its buffer. | |
166 | */ | |
bc0c38d1 SR |
167 | static struct trace_array global_trace; |
168 | ||
169 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); | |
170 | ||
4fcdae83 SR |
171 | /* |
172 | * The max_tr is used to snapshot the global_trace when a maximum | |
173 | * latency is reached. Some tracers will use this to store a maximum | |
174 | * trace while it continues examining live traces. | |
175 | * | |
176 | * The buffers for the max_tr are set up the same as the global_trace. | |
177 | * When a snapshot is taken, the link list of the max_tr is swapped | |
178 | * with the link list of the global_trace and the buffers are reset for | |
179 | * the global_trace so the tracing can continue. | |
180 | */ | |
bc0c38d1 SR |
181 | static struct trace_array max_tr; |
182 | ||
183 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); | |
184 | ||
4fcdae83 | 185 | /* tracer_enabled is used to toggle activation of a tracer */ |
26994ead | 186 | static int tracer_enabled = 1; |
4fcdae83 | 187 | |
9036990d SR |
188 | /** |
189 | * tracing_is_enabled - return tracer_enabled status | |
190 | * | |
191 | * This function is used by other tracers to know the status | |
192 | * of the tracer_enabled flag. Tracers may use this function | |
193 | * to know if it should enable their features when starting | |
194 | * up. See irqsoff tracer for an example (start_irqsoff_tracer). | |
195 | */ | |
196 | int tracing_is_enabled(void) | |
197 | { | |
198 | return tracer_enabled; | |
199 | } | |
200 | ||
4fcdae83 | 201 | /* |
3928a8a2 SR |
202 | * trace_buf_size is the size in bytes that is allocated |
203 | * for a buffer. Note, the number of bytes is always rounded | |
204 | * to page size. | |
3f5a54e3 SR |
205 | * |
206 | * This number is purposely set to a low number of 16384. | |
207 | * If the dump on oops happens, it will be much appreciated | |
208 | * to not have to wait for all that output. Anyway this can be | |
209 | * boot time and run time configurable. | |
4fcdae83 | 210 | */ |
3928a8a2 | 211 | #define TRACE_BUF_SIZE_DEFAULT 1441792UL /* 16384 * 88 (sizeof(entry)) */ |
3f5a54e3 | 212 | |
3928a8a2 | 213 | static unsigned long trace_buf_size = TRACE_BUF_SIZE_DEFAULT; |
bc0c38d1 | 214 | |
4fcdae83 | 215 | /* trace_types holds a link list of available tracers. */ |
bc0c38d1 | 216 | static struct tracer *trace_types __read_mostly; |
4fcdae83 SR |
217 | |
218 | /* current_trace points to the tracer that is currently active */ | |
bc0c38d1 | 219 | static struct tracer *current_trace __read_mostly; |
4fcdae83 SR |
220 | |
221 | /* | |
222 | * max_tracer_type_len is used to simplify the allocating of | |
223 | * buffers to read userspace tracer names. We keep track of | |
224 | * the longest tracer name registered. | |
225 | */ | |
bc0c38d1 SR |
226 | static int max_tracer_type_len; |
227 | ||
4fcdae83 SR |
228 | /* |
229 | * trace_types_lock is used to protect the trace_types list. | |
230 | * This lock is also used to keep user access serialized. | |
231 | * Accesses from userspace will grab this lock while userspace | |
232 | * activities happen inside the kernel. | |
233 | */ | |
bc0c38d1 | 234 | static DEFINE_MUTEX(trace_types_lock); |
4fcdae83 SR |
235 | |
236 | /* trace_wait is a waitqueue for tasks blocked on trace_poll */ | |
4e655519 IM |
237 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
238 | ||
ee6bce52 | 239 | /* trace_flags holds trace_options default values */ |
12ef7d44 | 240 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK | |
c4a8e8be | 241 | TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO; |
4e655519 | 242 | |
4fcdae83 SR |
243 | /** |
244 | * trace_wake_up - wake up tasks waiting for trace input | |
245 | * | |
246 | * Simply wakes up any task that is blocked on the trace_wait | |
247 | * queue. These is used with trace_poll for tasks polling the trace. | |
248 | */ | |
4e655519 IM |
249 | void trace_wake_up(void) |
250 | { | |
017730c1 IM |
251 | /* |
252 | * The runqueue_is_locked() can fail, but this is the best we | |
253 | * have for now: | |
254 | */ | |
255 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) | |
4e655519 IM |
256 | wake_up(&trace_wait); |
257 | } | |
bc0c38d1 | 258 | |
3928a8a2 | 259 | static int __init set_buf_size(char *str) |
bc0c38d1 | 260 | { |
3928a8a2 | 261 | unsigned long buf_size; |
c6caeeb1 SR |
262 | int ret; |
263 | ||
bc0c38d1 SR |
264 | if (!str) |
265 | return 0; | |
3928a8a2 | 266 | ret = strict_strtoul(str, 0, &buf_size); |
c6caeeb1 | 267 | /* nr_entries can not be zero */ |
3928a8a2 | 268 | if (ret < 0 || buf_size == 0) |
c6caeeb1 | 269 | return 0; |
3928a8a2 | 270 | trace_buf_size = buf_size; |
bc0c38d1 SR |
271 | return 1; |
272 | } | |
3928a8a2 | 273 | __setup("trace_buf_size=", set_buf_size); |
bc0c38d1 | 274 | |
57f50be1 SR |
275 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
276 | { | |
277 | return nsecs / 1000; | |
278 | } | |
279 | ||
4fcdae83 | 280 | /* These must match the bit postions in trace_iterator_flags */ |
bc0c38d1 SR |
281 | static const char *trace_options[] = { |
282 | "print-parent", | |
283 | "sym-offset", | |
284 | "sym-addr", | |
285 | "verbose", | |
f9896bf3 | 286 | "raw", |
5e3ca0ec | 287 | "hex", |
cb0f12aa | 288 | "bin", |
2a2cc8f7 | 289 | "block", |
86387f7e | 290 | "stacktrace", |
4ac3ba41 | 291 | "sched-tree", |
f09ce573 | 292 | "ftrace_printk", |
b2a866f9 | 293 | "ftrace_preempt", |
9f029e83 | 294 | "branch", |
12ef7d44 | 295 | "annotate", |
02b67518 | 296 | "userstacktrace", |
b54d3de9 | 297 | "sym-userobj", |
66896a85 | 298 | "printk-msg-only", |
c4a8e8be | 299 | "context-info", |
bc0c38d1 SR |
300 | NULL |
301 | }; | |
302 | ||
4fcdae83 SR |
303 | /* |
304 | * ftrace_max_lock is used to protect the swapping of buffers | |
305 | * when taking a max snapshot. The buffers themselves are | |
306 | * protected by per_cpu spinlocks. But the action of the swap | |
307 | * needs its own lock. | |
308 | * | |
309 | * This is defined as a raw_spinlock_t in order to help | |
310 | * with performance when lockdep debugging is enabled. | |
311 | */ | |
92205c23 SR |
312 | static raw_spinlock_t ftrace_max_lock = |
313 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; | |
bc0c38d1 SR |
314 | |
315 | /* | |
316 | * Copy the new maximum trace into the separate maximum-trace | |
317 | * structure. (this way the maximum trace is permanently saved, | |
318 | * for later retrieval via /debugfs/tracing/latency_trace) | |
319 | */ | |
e309b41d | 320 | static void |
bc0c38d1 SR |
321 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
322 | { | |
323 | struct trace_array_cpu *data = tr->data[cpu]; | |
324 | ||
325 | max_tr.cpu = cpu; | |
326 | max_tr.time_start = data->preempt_timestamp; | |
327 | ||
328 | data = max_tr.data[cpu]; | |
329 | data->saved_latency = tracing_max_latency; | |
330 | ||
331 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); | |
332 | data->pid = tsk->pid; | |
b6dff3ec | 333 | data->uid = task_uid(tsk); |
bc0c38d1 SR |
334 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; |
335 | data->policy = tsk->policy; | |
336 | data->rt_priority = tsk->rt_priority; | |
337 | ||
338 | /* record this tasks comm */ | |
af513098 | 339 | tracing_record_cmdline(tsk); |
bc0c38d1 SR |
340 | } |
341 | ||
e309b41d | 342 | static void |
214023c3 SR |
343 | trace_seq_reset(struct trace_seq *s) |
344 | { | |
345 | s->len = 0; | |
6c6c2796 PP |
346 | s->readpos = 0; |
347 | } | |
348 | ||
349 | ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) | |
350 | { | |
351 | int len; | |
352 | int ret; | |
353 | ||
354 | if (s->len <= s->readpos) | |
355 | return -EBUSY; | |
356 | ||
357 | len = s->len - s->readpos; | |
358 | if (cnt > len) | |
359 | cnt = len; | |
360 | ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); | |
361 | if (ret) | |
362 | return -EFAULT; | |
363 | ||
364 | s->readpos += len; | |
365 | return cnt; | |
214023c3 SR |
366 | } |
367 | ||
3c56819b EGM |
368 | ssize_t trace_seq_to_buffer(struct trace_seq *s, void *buf, size_t cnt) |
369 | { | |
370 | int len; | |
371 | void *ret; | |
372 | ||
373 | if (s->len <= s->readpos) | |
374 | return -EBUSY; | |
375 | ||
376 | len = s->len - s->readpos; | |
377 | if (cnt > len) | |
378 | cnt = len; | |
379 | ret = memcpy(buf, s->buffer + s->readpos, cnt); | |
380 | if (!ret) | |
381 | return -EFAULT; | |
382 | ||
383 | s->readpos += len; | |
384 | return cnt; | |
385 | } | |
386 | ||
e309b41d | 387 | static void |
214023c3 SR |
388 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
389 | { | |
390 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; | |
391 | ||
392 | s->buffer[len] = 0; | |
393 | seq_puts(m, s->buffer); | |
394 | ||
395 | trace_seq_reset(s); | |
396 | } | |
397 | ||
4fcdae83 SR |
398 | /** |
399 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr | |
400 | * @tr: tracer | |
401 | * @tsk: the task with the latency | |
402 | * @cpu: The cpu that initiated the trace. | |
403 | * | |
404 | * Flip the buffers between the @tr and the max_tr and record information | |
405 | * about which task was the cause of this latency. | |
406 | */ | |
e309b41d | 407 | void |
bc0c38d1 SR |
408 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
409 | { | |
3928a8a2 | 410 | struct ring_buffer *buf = tr->buffer; |
bc0c38d1 | 411 | |
4c11d7ae | 412 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 413 | __raw_spin_lock(&ftrace_max_lock); |
3928a8a2 SR |
414 | |
415 | tr->buffer = max_tr.buffer; | |
416 | max_tr.buffer = buf; | |
417 | ||
d769041f | 418 | ftrace_disable_cpu(); |
3928a8a2 | 419 | ring_buffer_reset(tr->buffer); |
d769041f | 420 | ftrace_enable_cpu(); |
bc0c38d1 SR |
421 | |
422 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 423 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
424 | } |
425 | ||
426 | /** | |
427 | * update_max_tr_single - only copy one trace over, and reset the rest | |
428 | * @tr - tracer | |
429 | * @tsk - task with the latency | |
430 | * @cpu - the cpu of the buffer to copy. | |
4fcdae83 SR |
431 | * |
432 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. | |
bc0c38d1 | 433 | */ |
e309b41d | 434 | void |
bc0c38d1 SR |
435 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
436 | { | |
3928a8a2 | 437 | int ret; |
bc0c38d1 | 438 | |
4c11d7ae | 439 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 440 | __raw_spin_lock(&ftrace_max_lock); |
bc0c38d1 | 441 | |
d769041f SR |
442 | ftrace_disable_cpu(); |
443 | ||
3928a8a2 SR |
444 | ring_buffer_reset(max_tr.buffer); |
445 | ret = ring_buffer_swap_cpu(max_tr.buffer, tr->buffer, cpu); | |
446 | ||
d769041f SR |
447 | ftrace_enable_cpu(); |
448 | ||
97b17efe | 449 | WARN_ON_ONCE(ret && ret != -EAGAIN); |
bc0c38d1 SR |
450 | |
451 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 452 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
453 | } |
454 | ||
4fcdae83 SR |
455 | /** |
456 | * register_tracer - register a tracer with the ftrace system. | |
457 | * @type - the plugin for the tracer | |
458 | * | |
459 | * Register a new plugin tracer. | |
460 | */ | |
bc0c38d1 | 461 | int register_tracer(struct tracer *type) |
e7669b8e HE |
462 | __releases(kernel_lock) |
463 | __acquires(kernel_lock) | |
bc0c38d1 SR |
464 | { |
465 | struct tracer *t; | |
466 | int len; | |
467 | int ret = 0; | |
468 | ||
469 | if (!type->name) { | |
470 | pr_info("Tracer must have a name\n"); | |
471 | return -1; | |
472 | } | |
473 | ||
86fa2f60 IM |
474 | /* |
475 | * When this gets called we hold the BKL which means that | |
476 | * preemption is disabled. Various trace selftests however | |
477 | * need to disable and enable preemption for successful tests. | |
478 | * So we drop the BKL here and grab it after the tests again. | |
479 | */ | |
480 | unlock_kernel(); | |
bc0c38d1 | 481 | mutex_lock(&trace_types_lock); |
86fa2f60 | 482 | |
8e1b82e0 FW |
483 | tracing_selftest_running = true; |
484 | ||
bc0c38d1 SR |
485 | for (t = trace_types; t; t = t->next) { |
486 | if (strcmp(type->name, t->name) == 0) { | |
487 | /* already found */ | |
488 | pr_info("Trace %s already registered\n", | |
489 | type->name); | |
490 | ret = -1; | |
491 | goto out; | |
492 | } | |
493 | } | |
494 | ||
adf9f195 FW |
495 | if (!type->set_flag) |
496 | type->set_flag = &dummy_set_flag; | |
497 | if (!type->flags) | |
498 | type->flags = &dummy_tracer_flags; | |
499 | else | |
500 | if (!type->flags->opts) | |
501 | type->flags->opts = dummy_tracer_opt; | |
6eaaa5d5 FW |
502 | if (!type->wait_pipe) |
503 | type->wait_pipe = default_wait_pipe; | |
504 | ||
adf9f195 | 505 | |
60a11774 | 506 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
b2821ae6 | 507 | if (type->selftest && !tracing_selftest_disabled) { |
60a11774 | 508 | struct tracer *saved_tracer = current_trace; |
60a11774 | 509 | struct trace_array *tr = &global_trace; |
60a11774 | 510 | int i; |
ff32504f | 511 | |
60a11774 SR |
512 | /* |
513 | * Run a selftest on this tracer. | |
514 | * Here we reset the trace buffer, and set the current | |
515 | * tracer to be this tracer. The tracer can then run some | |
516 | * internal tracing to verify that everything is in order. | |
517 | * If we fail, we do not register this tracer. | |
518 | */ | |
86fa2f60 | 519 | for_each_tracing_cpu(i) |
3928a8a2 | 520 | tracing_reset(tr, i); |
86fa2f60 | 521 | |
60a11774 | 522 | current_trace = type; |
60a11774 SR |
523 | /* the test is responsible for initializing and enabling */ |
524 | pr_info("Testing tracer %s: ", type->name); | |
525 | ret = type->selftest(type, tr); | |
526 | /* the test is responsible for resetting too */ | |
527 | current_trace = saved_tracer; | |
60a11774 SR |
528 | if (ret) { |
529 | printk(KERN_CONT "FAILED!\n"); | |
530 | goto out; | |
531 | } | |
1d4db00a | 532 | /* Only reset on passing, to avoid touching corrupted buffers */ |
86fa2f60 | 533 | for_each_tracing_cpu(i) |
3928a8a2 | 534 | tracing_reset(tr, i); |
86fa2f60 | 535 | |
60a11774 SR |
536 | printk(KERN_CONT "PASSED\n"); |
537 | } | |
538 | #endif | |
539 | ||
bc0c38d1 SR |
540 | type->next = trace_types; |
541 | trace_types = type; | |
542 | len = strlen(type->name); | |
543 | if (len > max_tracer_type_len) | |
544 | max_tracer_type_len = len; | |
60a11774 | 545 | |
bc0c38d1 | 546 | out: |
8e1b82e0 | 547 | tracing_selftest_running = false; |
bc0c38d1 SR |
548 | mutex_unlock(&trace_types_lock); |
549 | ||
dac74940 SR |
550 | if (ret || !default_bootup_tracer) |
551 | goto out_unlock; | |
552 | ||
553 | if (strncmp(default_bootup_tracer, type->name, BOOTUP_TRACER_SIZE)) | |
554 | goto out_unlock; | |
555 | ||
556 | printk(KERN_INFO "Starting tracer '%s'\n", type->name); | |
557 | /* Do we want this tracer to start on bootup? */ | |
558 | tracing_set_tracer(type->name); | |
559 | default_bootup_tracer = NULL; | |
560 | /* disable other selftests, since this will break it. */ | |
561 | tracing_selftest_disabled = 1; | |
b2821ae6 | 562 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
dac74940 SR |
563 | printk(KERN_INFO "Disabling FTRACE selftests due to running tracer '%s'\n", |
564 | type->name); | |
b2821ae6 | 565 | #endif |
b2821ae6 | 566 | |
dac74940 | 567 | out_unlock: |
b2821ae6 | 568 | lock_kernel(); |
bc0c38d1 SR |
569 | return ret; |
570 | } | |
571 | ||
572 | void unregister_tracer(struct tracer *type) | |
573 | { | |
574 | struct tracer **t; | |
575 | int len; | |
576 | ||
577 | mutex_lock(&trace_types_lock); | |
578 | for (t = &trace_types; *t; t = &(*t)->next) { | |
579 | if (*t == type) | |
580 | goto found; | |
581 | } | |
582 | pr_info("Trace %s not registered\n", type->name); | |
583 | goto out; | |
584 | ||
585 | found: | |
586 | *t = (*t)->next; | |
b5db03c4 ACM |
587 | |
588 | if (type == current_trace && tracer_enabled) { | |
589 | tracer_enabled = 0; | |
590 | tracing_stop(); | |
591 | if (current_trace->stop) | |
592 | current_trace->stop(&global_trace); | |
593 | current_trace = &nop_trace; | |
594 | } | |
595 | ||
bc0c38d1 SR |
596 | if (strlen(type->name) != max_tracer_type_len) |
597 | goto out; | |
598 | ||
599 | max_tracer_type_len = 0; | |
600 | for (t = &trace_types; *t; t = &(*t)->next) { | |
601 | len = strlen((*t)->name); | |
602 | if (len > max_tracer_type_len) | |
603 | max_tracer_type_len = len; | |
604 | } | |
605 | out: | |
606 | mutex_unlock(&trace_types_lock); | |
607 | } | |
608 | ||
3928a8a2 | 609 | void tracing_reset(struct trace_array *tr, int cpu) |
bc0c38d1 | 610 | { |
d769041f | 611 | ftrace_disable_cpu(); |
3928a8a2 | 612 | ring_buffer_reset_cpu(tr->buffer, cpu); |
d769041f | 613 | ftrace_enable_cpu(); |
bc0c38d1 SR |
614 | } |
615 | ||
213cc060 PE |
616 | void tracing_reset_online_cpus(struct trace_array *tr) |
617 | { | |
618 | int cpu; | |
619 | ||
620 | tr->time_start = ftrace_now(tr->cpu); | |
621 | ||
622 | for_each_online_cpu(cpu) | |
623 | tracing_reset(tr, cpu); | |
624 | } | |
625 | ||
bc0c38d1 SR |
626 | #define SAVED_CMDLINES 128 |
627 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; | |
628 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; | |
629 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; | |
630 | static int cmdline_idx; | |
631 | static DEFINE_SPINLOCK(trace_cmdline_lock); | |
25b0b44a | 632 | |
25b0b44a | 633 | /* temporary disable recording */ |
4fd27358 | 634 | static atomic_t trace_record_cmdline_disabled __read_mostly; |
bc0c38d1 SR |
635 | |
636 | static void trace_init_cmdlines(void) | |
637 | { | |
638 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); | |
639 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); | |
640 | cmdline_idx = 0; | |
641 | } | |
642 | ||
0f048701 SR |
643 | static int trace_stop_count; |
644 | static DEFINE_SPINLOCK(tracing_start_lock); | |
645 | ||
69bb54ec SR |
646 | /** |
647 | * ftrace_off_permanent - disable all ftrace code permanently | |
648 | * | |
649 | * This should only be called when a serious anomally has | |
650 | * been detected. This will turn off the function tracing, | |
651 | * ring buffers, and other tracing utilites. It takes no | |
652 | * locks and can be called from any context. | |
653 | */ | |
654 | void ftrace_off_permanent(void) | |
655 | { | |
656 | tracing_disabled = 1; | |
657 | ftrace_stop(); | |
658 | tracing_off_permanent(); | |
659 | } | |
660 | ||
0f048701 SR |
661 | /** |
662 | * tracing_start - quick start of the tracer | |
663 | * | |
664 | * If tracing is enabled but was stopped by tracing_stop, | |
665 | * this will start the tracer back up. | |
666 | */ | |
667 | void tracing_start(void) | |
668 | { | |
669 | struct ring_buffer *buffer; | |
670 | unsigned long flags; | |
671 | ||
672 | if (tracing_disabled) | |
673 | return; | |
674 | ||
675 | spin_lock_irqsave(&tracing_start_lock, flags); | |
b06a8301 SR |
676 | if (--trace_stop_count) { |
677 | if (trace_stop_count < 0) { | |
678 | /* Someone screwed up their debugging */ | |
679 | WARN_ON_ONCE(1); | |
680 | trace_stop_count = 0; | |
681 | } | |
0f048701 SR |
682 | goto out; |
683 | } | |
684 | ||
685 | ||
686 | buffer = global_trace.buffer; | |
687 | if (buffer) | |
688 | ring_buffer_record_enable(buffer); | |
689 | ||
690 | buffer = max_tr.buffer; | |
691 | if (buffer) | |
692 | ring_buffer_record_enable(buffer); | |
693 | ||
694 | ftrace_start(); | |
695 | out: | |
696 | spin_unlock_irqrestore(&tracing_start_lock, flags); | |
697 | } | |
698 | ||
699 | /** | |
700 | * tracing_stop - quick stop of the tracer | |
701 | * | |
702 | * Light weight way to stop tracing. Use in conjunction with | |
703 | * tracing_start. | |
704 | */ | |
705 | void tracing_stop(void) | |
706 | { | |
707 | struct ring_buffer *buffer; | |
708 | unsigned long flags; | |
709 | ||
710 | ftrace_stop(); | |
711 | spin_lock_irqsave(&tracing_start_lock, flags); | |
712 | if (trace_stop_count++) | |
713 | goto out; | |
714 | ||
715 | buffer = global_trace.buffer; | |
716 | if (buffer) | |
717 | ring_buffer_record_disable(buffer); | |
718 | ||
719 | buffer = max_tr.buffer; | |
720 | if (buffer) | |
721 | ring_buffer_record_disable(buffer); | |
722 | ||
723 | out: | |
724 | spin_unlock_irqrestore(&tracing_start_lock, flags); | |
725 | } | |
726 | ||
e309b41d | 727 | void trace_stop_cmdline_recording(void); |
bc0c38d1 | 728 | |
e309b41d | 729 | static void trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
730 | { |
731 | unsigned map; | |
732 | unsigned idx; | |
733 | ||
734 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
735 | return; | |
736 | ||
737 | /* | |
738 | * It's not the end of the world if we don't get | |
739 | * the lock, but we also don't want to spin | |
740 | * nor do we want to disable interrupts, | |
741 | * so if we miss here, then better luck next time. | |
742 | */ | |
743 | if (!spin_trylock(&trace_cmdline_lock)) | |
744 | return; | |
745 | ||
746 | idx = map_pid_to_cmdline[tsk->pid]; | |
747 | if (idx >= SAVED_CMDLINES) { | |
748 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; | |
749 | ||
750 | map = map_cmdline_to_pid[idx]; | |
751 | if (map <= PID_MAX_DEFAULT) | |
752 | map_pid_to_cmdline[map] = (unsigned)-1; | |
753 | ||
754 | map_pid_to_cmdline[tsk->pid] = idx; | |
755 | ||
756 | cmdline_idx = idx; | |
757 | } | |
758 | ||
759 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); | |
760 | ||
761 | spin_unlock(&trace_cmdline_lock); | |
762 | } | |
763 | ||
660c7f9b | 764 | char *trace_find_cmdline(int pid) |
bc0c38d1 SR |
765 | { |
766 | char *cmdline = "<...>"; | |
767 | unsigned map; | |
768 | ||
769 | if (!pid) | |
770 | return "<idle>"; | |
771 | ||
772 | if (pid > PID_MAX_DEFAULT) | |
773 | goto out; | |
774 | ||
775 | map = map_pid_to_cmdline[pid]; | |
776 | if (map >= SAVED_CMDLINES) | |
777 | goto out; | |
778 | ||
779 | cmdline = saved_cmdlines[map]; | |
780 | ||
781 | out: | |
782 | return cmdline; | |
783 | } | |
784 | ||
e309b41d | 785 | void tracing_record_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
786 | { |
787 | if (atomic_read(&trace_record_cmdline_disabled)) | |
788 | return; | |
789 | ||
790 | trace_save_cmdline(tsk); | |
791 | } | |
792 | ||
45dcd8b8 | 793 | void |
38697053 SR |
794 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags, |
795 | int pc) | |
bc0c38d1 SR |
796 | { |
797 | struct task_struct *tsk = current; | |
bc0c38d1 | 798 | |
777e208d SR |
799 | entry->preempt_count = pc & 0xff; |
800 | entry->pid = (tsk) ? tsk->pid : 0; | |
b54d3de9 | 801 | entry->tgid = (tsk) ? tsk->tgid : 0; |
777e208d | 802 | entry->flags = |
9244489a | 803 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT |
2e2ca155 | 804 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
9244489a SR |
805 | #else |
806 | TRACE_FLAG_IRQS_NOSUPPORT | | |
807 | #endif | |
bc0c38d1 SR |
808 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
809 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | | |
810 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); | |
811 | } | |
812 | ||
51a763dd ACM |
813 | struct ring_buffer_event *trace_buffer_lock_reserve(struct trace_array *tr, |
814 | unsigned char type, | |
815 | unsigned long len, | |
816 | unsigned long flags, int pc) | |
817 | { | |
818 | struct ring_buffer_event *event; | |
819 | ||
820 | event = ring_buffer_lock_reserve(tr->buffer, len); | |
821 | if (event != NULL) { | |
822 | struct trace_entry *ent = ring_buffer_event_data(event); | |
823 | ||
824 | tracing_generic_entry_update(ent, flags, pc); | |
825 | ent->type = type; | |
826 | } | |
827 | ||
828 | return event; | |
829 | } | |
830 | static void ftrace_trace_stack(struct trace_array *tr, | |
831 | unsigned long flags, int skip, int pc); | |
832 | static void ftrace_trace_userstack(struct trace_array *tr, | |
833 | unsigned long flags, int pc); | |
834 | ||
835 | void trace_buffer_unlock_commit(struct trace_array *tr, | |
836 | struct ring_buffer_event *event, | |
837 | unsigned long flags, int pc) | |
838 | { | |
839 | ring_buffer_unlock_commit(tr->buffer, event); | |
840 | ||
841 | ftrace_trace_stack(tr, flags, 6, pc); | |
842 | ftrace_trace_userstack(tr, flags, pc); | |
843 | trace_wake_up(); | |
844 | } | |
845 | ||
e309b41d | 846 | void |
7be42151 | 847 | trace_function(struct trace_array *tr, |
38697053 SR |
848 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
849 | int pc) | |
bc0c38d1 | 850 | { |
3928a8a2 | 851 | struct ring_buffer_event *event; |
777e208d | 852 | struct ftrace_entry *entry; |
bc0c38d1 | 853 | |
d769041f SR |
854 | /* If we are reading the ring buffer, don't trace */ |
855 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) | |
856 | return; | |
857 | ||
51a763dd ACM |
858 | event = trace_buffer_lock_reserve(tr, TRACE_FN, sizeof(*entry), |
859 | flags, pc); | |
3928a8a2 SR |
860 | if (!event) |
861 | return; | |
862 | entry = ring_buffer_event_data(event); | |
777e208d SR |
863 | entry->ip = ip; |
864 | entry->parent_ip = parent_ip; | |
0a987751 | 865 | ring_buffer_unlock_commit(tr->buffer, event); |
bc0c38d1 SR |
866 | } |
867 | ||
fb52607a | 868 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
287b6e68 | 869 | static void __trace_graph_entry(struct trace_array *tr, |
287b6e68 FW |
870 | struct ftrace_graph_ent *trace, |
871 | unsigned long flags, | |
872 | int pc) | |
873 | { | |
874 | struct ring_buffer_event *event; | |
875 | struct ftrace_graph_ent_entry *entry; | |
287b6e68 FW |
876 | |
877 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) | |
878 | return; | |
879 | ||
51a763dd ACM |
880 | event = trace_buffer_lock_reserve(&global_trace, TRACE_GRAPH_ENT, |
881 | sizeof(*entry), flags, pc); | |
287b6e68 FW |
882 | if (!event) |
883 | return; | |
884 | entry = ring_buffer_event_data(event); | |
287b6e68 | 885 | entry->graph_ent = *trace; |
0a987751 | 886 | ring_buffer_unlock_commit(global_trace.buffer, event); |
287b6e68 FW |
887 | } |
888 | ||
889 | static void __trace_graph_return(struct trace_array *tr, | |
fb52607a | 890 | struct ftrace_graph_ret *trace, |
15e6cb36 FW |
891 | unsigned long flags, |
892 | int pc) | |
893 | { | |
894 | struct ring_buffer_event *event; | |
287b6e68 | 895 | struct ftrace_graph_ret_entry *entry; |
15e6cb36 FW |
896 | |
897 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) | |
898 | return; | |
899 | ||
51a763dd ACM |
900 | event = trace_buffer_lock_reserve(&global_trace, TRACE_GRAPH_RET, |
901 | sizeof(*entry), flags, pc); | |
15e6cb36 FW |
902 | if (!event) |
903 | return; | |
904 | entry = ring_buffer_event_data(event); | |
287b6e68 | 905 | entry->ret = *trace; |
0a987751 | 906 | ring_buffer_unlock_commit(global_trace.buffer, event); |
15e6cb36 FW |
907 | } |
908 | #endif | |
909 | ||
e309b41d | 910 | void |
2e0f5761 | 911 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
38697053 SR |
912 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
913 | int pc) | |
2e0f5761 IM |
914 | { |
915 | if (likely(!atomic_read(&data->disabled))) | |
7be42151 | 916 | trace_function(tr, ip, parent_ip, flags, pc); |
2e0f5761 IM |
917 | } |
918 | ||
53614991 | 919 | static void __ftrace_trace_stack(struct trace_array *tr, |
53614991 SR |
920 | unsigned long flags, |
921 | int skip, int pc) | |
86387f7e | 922 | { |
c2c80529 | 923 | #ifdef CONFIG_STACKTRACE |
3928a8a2 | 924 | struct ring_buffer_event *event; |
777e208d | 925 | struct stack_entry *entry; |
86387f7e IM |
926 | struct stack_trace trace; |
927 | ||
51a763dd ACM |
928 | event = trace_buffer_lock_reserve(tr, TRACE_STACK, |
929 | sizeof(*entry), flags, pc); | |
3928a8a2 SR |
930 | if (!event) |
931 | return; | |
932 | entry = ring_buffer_event_data(event); | |
777e208d | 933 | memset(&entry->caller, 0, sizeof(entry->caller)); |
86387f7e IM |
934 | |
935 | trace.nr_entries = 0; | |
936 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
937 | trace.skip = skip; | |
777e208d | 938 | trace.entries = entry->caller; |
86387f7e IM |
939 | |
940 | save_stack_trace(&trace); | |
0a987751 | 941 | ring_buffer_unlock_commit(tr->buffer, event); |
c2c80529 | 942 | #endif |
f0a920d5 IM |
943 | } |
944 | ||
53614991 | 945 | static void ftrace_trace_stack(struct trace_array *tr, |
53614991 SR |
946 | unsigned long flags, |
947 | int skip, int pc) | |
948 | { | |
949 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) | |
950 | return; | |
951 | ||
7be42151 | 952 | __ftrace_trace_stack(tr, flags, skip, pc); |
53614991 SR |
953 | } |
954 | ||
38697053 | 955 | void __trace_stack(struct trace_array *tr, |
38697053 | 956 | unsigned long flags, |
53614991 | 957 | int skip, int pc) |
38697053 | 958 | { |
7be42151 | 959 | __ftrace_trace_stack(tr, flags, skip, pc); |
38697053 SR |
960 | } |
961 | ||
02b67518 | 962 | static void ftrace_trace_userstack(struct trace_array *tr, |
7be42151 | 963 | unsigned long flags, int pc) |
02b67518 | 964 | { |
c7425acb | 965 | #ifdef CONFIG_STACKTRACE |
8d7c6a96 | 966 | struct ring_buffer_event *event; |
02b67518 TE |
967 | struct userstack_entry *entry; |
968 | struct stack_trace trace; | |
02b67518 TE |
969 | |
970 | if (!(trace_flags & TRACE_ITER_USERSTACKTRACE)) | |
971 | return; | |
972 | ||
51a763dd ACM |
973 | event = trace_buffer_lock_reserve(tr, TRACE_USER_STACK, |
974 | sizeof(*entry), flags, pc); | |
02b67518 TE |
975 | if (!event) |
976 | return; | |
977 | entry = ring_buffer_event_data(event); | |
02b67518 TE |
978 | |
979 | memset(&entry->caller, 0, sizeof(entry->caller)); | |
980 | ||
981 | trace.nr_entries = 0; | |
982 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
983 | trace.skip = 0; | |
984 | trace.entries = entry->caller; | |
985 | ||
986 | save_stack_trace_user(&trace); | |
0a987751 | 987 | ring_buffer_unlock_commit(tr->buffer, event); |
c7425acb | 988 | #endif |
02b67518 TE |
989 | } |
990 | ||
4fd27358 HE |
991 | #ifdef UNUSED |
992 | static void __trace_userstack(struct trace_array *tr, unsigned long flags) | |
02b67518 | 993 | { |
7be42151 | 994 | ftrace_trace_userstack(tr, flags, preempt_count()); |
02b67518 | 995 | } |
4fd27358 | 996 | #endif /* UNUSED */ |
02b67518 | 997 | |
38697053 | 998 | static void |
7be42151 | 999 | ftrace_trace_special(void *__tr, |
38697053 SR |
1000 | unsigned long arg1, unsigned long arg2, unsigned long arg3, |
1001 | int pc) | |
a4feb834 | 1002 | { |
3928a8a2 | 1003 | struct ring_buffer_event *event; |
a4feb834 | 1004 | struct trace_array *tr = __tr; |
777e208d | 1005 | struct special_entry *entry; |
a4feb834 | 1006 | |
51a763dd ACM |
1007 | event = trace_buffer_lock_reserve(tr, TRACE_SPECIAL, |
1008 | sizeof(*entry), 0, pc); | |
3928a8a2 SR |
1009 | if (!event) |
1010 | return; | |
1011 | entry = ring_buffer_event_data(event); | |
777e208d SR |
1012 | entry->arg1 = arg1; |
1013 | entry->arg2 = arg2; | |
1014 | entry->arg3 = arg3; | |
51a763dd | 1015 | trace_buffer_unlock_commit(tr, event, 0, pc); |
a4feb834 IM |
1016 | } |
1017 | ||
38697053 SR |
1018 | void |
1019 | __trace_special(void *__tr, void *__data, | |
1020 | unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
1021 | { | |
7be42151 | 1022 | ftrace_trace_special(__tr, arg1, arg2, arg3, preempt_count()); |
38697053 SR |
1023 | } |
1024 | ||
e309b41d | 1025 | void |
bc0c38d1 | 1026 | tracing_sched_switch_trace(struct trace_array *tr, |
86387f7e IM |
1027 | struct task_struct *prev, |
1028 | struct task_struct *next, | |
38697053 | 1029 | unsigned long flags, int pc) |
bc0c38d1 | 1030 | { |
3928a8a2 | 1031 | struct ring_buffer_event *event; |
777e208d | 1032 | struct ctx_switch_entry *entry; |
bc0c38d1 | 1033 | |
51a763dd ACM |
1034 | event = trace_buffer_lock_reserve(tr, TRACE_CTX, |
1035 | sizeof(*entry), flags, pc); | |
3928a8a2 SR |
1036 | if (!event) |
1037 | return; | |
1038 | entry = ring_buffer_event_data(event); | |
777e208d SR |
1039 | entry->prev_pid = prev->pid; |
1040 | entry->prev_prio = prev->prio; | |
1041 | entry->prev_state = prev->state; | |
1042 | entry->next_pid = next->pid; | |
1043 | entry->next_prio = next->prio; | |
1044 | entry->next_state = next->state; | |
1045 | entry->next_cpu = task_cpu(next); | |
51a763dd | 1046 | trace_buffer_unlock_commit(tr, event, flags, pc); |
bc0c38d1 SR |
1047 | } |
1048 | ||
57422797 IM |
1049 | void |
1050 | tracing_sched_wakeup_trace(struct trace_array *tr, | |
86387f7e IM |
1051 | struct task_struct *wakee, |
1052 | struct task_struct *curr, | |
38697053 | 1053 | unsigned long flags, int pc) |
57422797 | 1054 | { |
3928a8a2 | 1055 | struct ring_buffer_event *event; |
777e208d | 1056 | struct ctx_switch_entry *entry; |
57422797 | 1057 | |
51a763dd ACM |
1058 | event = trace_buffer_lock_reserve(tr, TRACE_WAKE, |
1059 | sizeof(*entry), flags, pc); | |
3928a8a2 SR |
1060 | if (!event) |
1061 | return; | |
1062 | entry = ring_buffer_event_data(event); | |
777e208d SR |
1063 | entry->prev_pid = curr->pid; |
1064 | entry->prev_prio = curr->prio; | |
1065 | entry->prev_state = curr->state; | |
1066 | entry->next_pid = wakee->pid; | |
1067 | entry->next_prio = wakee->prio; | |
1068 | entry->next_state = wakee->state; | |
1069 | entry->next_cpu = task_cpu(wakee); | |
6eaaa5d5 FW |
1070 | |
1071 | ring_buffer_unlock_commit(tr->buffer, event); | |
1072 | ftrace_trace_stack(tr, flags, 6, pc); | |
1073 | ftrace_trace_userstack(tr, flags, pc); | |
57422797 IM |
1074 | } |
1075 | ||
4902f884 SR |
1076 | void |
1077 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
1078 | { | |
1079 | struct trace_array *tr = &global_trace; | |
1080 | struct trace_array_cpu *data; | |
5aa1ba6a | 1081 | unsigned long flags; |
4902f884 | 1082 | int cpu; |
38697053 | 1083 | int pc; |
4902f884 | 1084 | |
c76f0694 | 1085 | if (tracing_disabled) |
4902f884 SR |
1086 | return; |
1087 | ||
38697053 | 1088 | pc = preempt_count(); |
5aa1ba6a | 1089 | local_irq_save(flags); |
4902f884 SR |
1090 | cpu = raw_smp_processor_id(); |
1091 | data = tr->data[cpu]; | |
4902f884 | 1092 | |
5aa1ba6a | 1093 | if (likely(atomic_inc_return(&data->disabled) == 1)) |
7be42151 | 1094 | ftrace_trace_special(tr, arg1, arg2, arg3, pc); |
4902f884 | 1095 | |
5aa1ba6a SR |
1096 | atomic_dec(&data->disabled); |
1097 | local_irq_restore(flags); | |
4902f884 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(); | |
7be42151 | 1122 | __trace_graph_entry(tr, trace, flags, pc); |
287b6e68 | 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(); | |
7be42151 | 1148 | __trace_graph_return(tr, 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 | |
bc0c38d1 SR |
1157 | enum trace_file_type { |
1158 | TRACE_FILE_LAT_FMT = 1, | |
12ef7d44 | 1159 | TRACE_FILE_ANNOTATE = 2, |
bc0c38d1 SR |
1160 | }; |
1161 | ||
e2ac8ef5 | 1162 | static void trace_iterator_increment(struct trace_iterator *iter) |
5a90f577 | 1163 | { |
d769041f SR |
1164 | /* Don't allow ftrace to trace into the ring buffers */ |
1165 | ftrace_disable_cpu(); | |
1166 | ||
5a90f577 | 1167 | iter->idx++; |
d769041f SR |
1168 | if (iter->buffer_iter[iter->cpu]) |
1169 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); | |
1170 | ||
1171 | ftrace_enable_cpu(); | |
5a90f577 SR |
1172 | } |
1173 | ||
e309b41d | 1174 | static struct trace_entry * |
3928a8a2 | 1175 | peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts) |
dd0e545f | 1176 | { |
3928a8a2 SR |
1177 | struct ring_buffer_event *event; |
1178 | struct ring_buffer_iter *buf_iter = iter->buffer_iter[cpu]; | |
dd0e545f | 1179 | |
d769041f SR |
1180 | /* Don't allow ftrace to trace into the ring buffers */ |
1181 | ftrace_disable_cpu(); | |
1182 | ||
1183 | if (buf_iter) | |
1184 | event = ring_buffer_iter_peek(buf_iter, ts); | |
1185 | else | |
1186 | event = ring_buffer_peek(iter->tr->buffer, cpu, ts); | |
1187 | ||
1188 | ftrace_enable_cpu(); | |
1189 | ||
3928a8a2 | 1190 | return event ? ring_buffer_event_data(event) : NULL; |
dd0e545f | 1191 | } |
d769041f | 1192 | |
dd0e545f | 1193 | static struct trace_entry * |
3928a8a2 | 1194 | __find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
bc0c38d1 | 1195 | { |
3928a8a2 | 1196 | struct ring_buffer *buffer = iter->tr->buffer; |
bc0c38d1 | 1197 | struct trace_entry *ent, *next = NULL; |
3928a8a2 | 1198 | u64 next_ts = 0, ts; |
bc0c38d1 SR |
1199 | int next_cpu = -1; |
1200 | int cpu; | |
1201 | ||
ab46428c | 1202 | for_each_tracing_cpu(cpu) { |
dd0e545f | 1203 | |
3928a8a2 SR |
1204 | if (ring_buffer_empty_cpu(buffer, cpu)) |
1205 | continue; | |
dd0e545f | 1206 | |
3928a8a2 | 1207 | ent = peek_next_entry(iter, cpu, &ts); |
dd0e545f | 1208 | |
cdd31cd2 IM |
1209 | /* |
1210 | * Pick the entry with the smallest timestamp: | |
1211 | */ | |
3928a8a2 | 1212 | if (ent && (!next || ts < next_ts)) { |
bc0c38d1 SR |
1213 | next = ent; |
1214 | next_cpu = cpu; | |
3928a8a2 | 1215 | next_ts = ts; |
bc0c38d1 SR |
1216 | } |
1217 | } | |
1218 | ||
1219 | if (ent_cpu) | |
1220 | *ent_cpu = next_cpu; | |
1221 | ||
3928a8a2 SR |
1222 | if (ent_ts) |
1223 | *ent_ts = next_ts; | |
1224 | ||
bc0c38d1 SR |
1225 | return next; |
1226 | } | |
1227 | ||
dd0e545f | 1228 | /* Find the next real entry, without updating the iterator itself */ |
c4a8e8be FW |
1229 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, |
1230 | int *ent_cpu, u64 *ent_ts) | |
bc0c38d1 | 1231 | { |
3928a8a2 | 1232 | return __find_next_entry(iter, ent_cpu, ent_ts); |
dd0e545f SR |
1233 | } |
1234 | ||
1235 | /* Find the next real entry, and increment the iterator to the next entry */ | |
1236 | static void *find_next_entry_inc(struct trace_iterator *iter) | |
1237 | { | |
3928a8a2 | 1238 | iter->ent = __find_next_entry(iter, &iter->cpu, &iter->ts); |
dd0e545f | 1239 | |
3928a8a2 | 1240 | if (iter->ent) |
e2ac8ef5 | 1241 | trace_iterator_increment(iter); |
dd0e545f | 1242 | |
3928a8a2 | 1243 | return iter->ent ? iter : NULL; |
b3806b43 | 1244 | } |
bc0c38d1 | 1245 | |
e309b41d | 1246 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 | 1247 | { |
d769041f SR |
1248 | /* Don't allow ftrace to trace into the ring buffers */ |
1249 | ftrace_disable_cpu(); | |
3928a8a2 | 1250 | ring_buffer_consume(iter->tr->buffer, iter->cpu, &iter->ts); |
d769041f | 1251 | ftrace_enable_cpu(); |
bc0c38d1 SR |
1252 | } |
1253 | ||
e309b41d | 1254 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
1255 | { |
1256 | struct trace_iterator *iter = m->private; | |
bc0c38d1 | 1257 | int i = (int)*pos; |
4e3c3333 | 1258 | void *ent; |
bc0c38d1 SR |
1259 | |
1260 | (*pos)++; | |
1261 | ||
1262 | /* can't go backwards */ | |
1263 | if (iter->idx > i) | |
1264 | return NULL; | |
1265 | ||
1266 | if (iter->idx < 0) | |
1267 | ent = find_next_entry_inc(iter); | |
1268 | else | |
1269 | ent = iter; | |
1270 | ||
1271 | while (ent && iter->idx < i) | |
1272 | ent = find_next_entry_inc(iter); | |
1273 | ||
1274 | iter->pos = *pos; | |
1275 | ||
bc0c38d1 SR |
1276 | return ent; |
1277 | } | |
1278 | ||
1279 | static void *s_start(struct seq_file *m, loff_t *pos) | |
1280 | { | |
1281 | struct trace_iterator *iter = m->private; | |
1282 | void *p = NULL; | |
1283 | loff_t l = 0; | |
3928a8a2 | 1284 | int cpu; |
bc0c38d1 SR |
1285 | |
1286 | mutex_lock(&trace_types_lock); | |
1287 | ||
d15f57f2 SR |
1288 | if (!current_trace || current_trace != iter->trace) { |
1289 | mutex_unlock(&trace_types_lock); | |
bc0c38d1 | 1290 | return NULL; |
d15f57f2 | 1291 | } |
bc0c38d1 SR |
1292 | |
1293 | atomic_inc(&trace_record_cmdline_disabled); | |
1294 | ||
bc0c38d1 SR |
1295 | if (*pos != iter->pos) { |
1296 | iter->ent = NULL; | |
1297 | iter->cpu = 0; | |
1298 | iter->idx = -1; | |
1299 | ||
d769041f SR |
1300 | ftrace_disable_cpu(); |
1301 | ||
3928a8a2 SR |
1302 | for_each_tracing_cpu(cpu) { |
1303 | ring_buffer_iter_reset(iter->buffer_iter[cpu]); | |
4c11d7ae | 1304 | } |
bc0c38d1 | 1305 | |
d769041f SR |
1306 | ftrace_enable_cpu(); |
1307 | ||
bc0c38d1 SR |
1308 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
1309 | ; | |
1310 | ||
1311 | } else { | |
4c11d7ae | 1312 | l = *pos - 1; |
bc0c38d1 SR |
1313 | p = s_next(m, p, &l); |
1314 | } | |
1315 | ||
1316 | return p; | |
1317 | } | |
1318 | ||
1319 | static void s_stop(struct seq_file *m, void *p) | |
1320 | { | |
bc0c38d1 | 1321 | atomic_dec(&trace_record_cmdline_disabled); |
bc0c38d1 SR |
1322 | mutex_unlock(&trace_types_lock); |
1323 | } | |
1324 | ||
e309b41d | 1325 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 | 1326 | { |
a6168353 ME |
1327 | seq_puts(m, "# _------=> CPU# \n"); |
1328 | seq_puts(m, "# / _-----=> irqs-off \n"); | |
1329 | seq_puts(m, "# | / _----=> need-resched \n"); | |
1330 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); | |
1331 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); | |
1332 | seq_puts(m, "# |||| / \n"); | |
1333 | seq_puts(m, "# ||||| delay \n"); | |
1334 | seq_puts(m, "# cmd pid ||||| time | caller \n"); | |
1335 | seq_puts(m, "# \\ / ||||| \\ | / \n"); | |
bc0c38d1 SR |
1336 | } |
1337 | ||
e309b41d | 1338 | static void print_func_help_header(struct seq_file *m) |
bc0c38d1 | 1339 | { |
a6168353 ME |
1340 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
1341 | seq_puts(m, "# | | | | |\n"); | |
bc0c38d1 SR |
1342 | } |
1343 | ||
1344 | ||
e309b41d | 1345 | static void |
bc0c38d1 SR |
1346 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
1347 | { | |
1348 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); | |
1349 | struct trace_array *tr = iter->tr; | |
1350 | struct trace_array_cpu *data = tr->data[tr->cpu]; | |
1351 | struct tracer *type = current_trace; | |
3928a8a2 SR |
1352 | unsigned long total; |
1353 | unsigned long entries; | |
bc0c38d1 SR |
1354 | const char *name = "preemption"; |
1355 | ||
1356 | if (type) | |
1357 | name = type->name; | |
1358 | ||
3928a8a2 SR |
1359 | entries = ring_buffer_entries(iter->tr->buffer); |
1360 | total = entries + | |
1361 | ring_buffer_overruns(iter->tr->buffer); | |
bc0c38d1 SR |
1362 | |
1363 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", | |
1364 | name, UTS_RELEASE); | |
1365 | seq_puts(m, "-----------------------------------" | |
1366 | "---------------------------------\n"); | |
1367 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" | |
1368 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", | |
57f50be1 | 1369 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 1370 | entries, |
4c11d7ae | 1371 | total, |
bc0c38d1 SR |
1372 | tr->cpu, |
1373 | #if defined(CONFIG_PREEMPT_NONE) | |
1374 | "server", | |
1375 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
1376 | "desktop", | |
b5c21b45 | 1377 | #elif defined(CONFIG_PREEMPT) |
bc0c38d1 SR |
1378 | "preempt", |
1379 | #else | |
1380 | "unknown", | |
1381 | #endif | |
1382 | /* These are reserved for later use */ | |
1383 | 0, 0, 0, 0); | |
1384 | #ifdef CONFIG_SMP | |
1385 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
1386 | #else | |
1387 | seq_puts(m, ")\n"); | |
1388 | #endif | |
1389 | seq_puts(m, " -----------------\n"); | |
1390 | seq_printf(m, " | task: %.16s-%d " | |
1391 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", | |
1392 | data->comm, data->pid, data->uid, data->nice, | |
1393 | data->policy, data->rt_priority); | |
1394 | seq_puts(m, " -----------------\n"); | |
1395 | ||
1396 | if (data->critical_start) { | |
1397 | seq_puts(m, " => started at: "); | |
214023c3 SR |
1398 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
1399 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 | 1400 | seq_puts(m, "\n => ended at: "); |
214023c3 SR |
1401 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
1402 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 SR |
1403 | seq_puts(m, "\n"); |
1404 | } | |
1405 | ||
1406 | seq_puts(m, "\n"); | |
1407 | } | |
1408 | ||
a309720c SR |
1409 | static void test_cpu_buff_start(struct trace_iterator *iter) |
1410 | { | |
1411 | struct trace_seq *s = &iter->seq; | |
1412 | ||
12ef7d44 SR |
1413 | if (!(trace_flags & TRACE_ITER_ANNOTATE)) |
1414 | return; | |
1415 | ||
1416 | if (!(iter->iter_flags & TRACE_FILE_ANNOTATE)) | |
1417 | return; | |
1418 | ||
4462344e | 1419 | if (cpumask_test_cpu(iter->cpu, iter->started)) |
a309720c SR |
1420 | return; |
1421 | ||
4462344e | 1422 | cpumask_set_cpu(iter->cpu, iter->started); |
a309720c SR |
1423 | trace_seq_printf(s, "##### CPU %u buffer started ####\n", iter->cpu); |
1424 | } | |
1425 | ||
c4a8e8be | 1426 | static enum print_line_t print_lat_fmt(struct trace_iterator *iter) |
bc0c38d1 | 1427 | { |
214023c3 | 1428 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1429 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
f633cef0 | 1430 | struct trace_event *event; |
bc0c38d1 | 1431 | struct trace_entry *entry = iter->ent; |
dd0e545f | 1432 | |
a309720c SR |
1433 | test_cpu_buff_start(iter); |
1434 | ||
c4a8e8be FW |
1435 | event = ftrace_find_event(entry->type); |
1436 | ||
1437 | if (trace_flags & TRACE_ITER_CONTEXT_INFO) { | |
d9793bd8 ACM |
1438 | if (!trace_print_lat_context(iter)) |
1439 | goto partial; | |
bc0c38d1 | 1440 | } |
777e208d | 1441 | |
268ccda0 | 1442 | if (event) |
d9793bd8 ACM |
1443 | return event->latency_trace(iter, sym_flags); |
1444 | ||
1445 | if (!trace_seq_printf(s, "Unknown type %d\n", entry->type)) | |
1446 | goto partial; | |
02b67518 | 1447 | |
2c4f035f | 1448 | return TRACE_TYPE_HANDLED; |
d9793bd8 ACM |
1449 | partial: |
1450 | return TRACE_TYPE_PARTIAL_LINE; | |
bc0c38d1 SR |
1451 | } |
1452 | ||
2c4f035f | 1453 | static enum print_line_t print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 1454 | { |
214023c3 | 1455 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1456 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 1457 | struct trace_entry *entry; |
f633cef0 | 1458 | struct trace_event *event; |
bc0c38d1 | 1459 | |
4e3c3333 | 1460 | entry = iter->ent; |
dd0e545f | 1461 | |
a309720c SR |
1462 | test_cpu_buff_start(iter); |
1463 | ||
c4a8e8be | 1464 | event = ftrace_find_event(entry->type); |
bc0c38d1 | 1465 | |
c4a8e8be | 1466 | if (trace_flags & TRACE_ITER_CONTEXT_INFO) { |
d9793bd8 ACM |
1467 | if (!trace_print_context(iter)) |
1468 | goto partial; | |
c4a8e8be | 1469 | } |
bc0c38d1 | 1470 | |
268ccda0 | 1471 | if (event) |
d9793bd8 ACM |
1472 | return event->trace(iter, sym_flags); |
1473 | ||
1474 | if (!trace_seq_printf(s, "Unknown type %d\n", entry->type)) | |
1475 | goto partial; | |
02b67518 | 1476 | |
2c4f035f | 1477 | return TRACE_TYPE_HANDLED; |
d9793bd8 ACM |
1478 | partial: |
1479 | return TRACE_TYPE_PARTIAL_LINE; | |
bc0c38d1 SR |
1480 | } |
1481 | ||
2c4f035f | 1482 | static enum print_line_t print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 IM |
1483 | { |
1484 | struct trace_seq *s = &iter->seq; | |
1485 | struct trace_entry *entry; | |
f633cef0 | 1486 | struct trace_event *event; |
f9896bf3 IM |
1487 | |
1488 | entry = iter->ent; | |
dd0e545f | 1489 | |
c4a8e8be | 1490 | if (trace_flags & TRACE_ITER_CONTEXT_INFO) { |
d9793bd8 ACM |
1491 | if (!trace_seq_printf(s, "%d %d %llu ", |
1492 | entry->pid, iter->cpu, iter->ts)) | |
1493 | goto partial; | |
c4a8e8be | 1494 | } |
f9896bf3 | 1495 | |
f633cef0 | 1496 | event = ftrace_find_event(entry->type); |
268ccda0 | 1497 | if (event) |
d9793bd8 ACM |
1498 | return event->raw(iter, 0); |
1499 | ||
1500 | if (!trace_seq_printf(s, "%d ?\n", entry->type)) | |
1501 | goto partial; | |
777e208d | 1502 | |
2c4f035f | 1503 | return TRACE_TYPE_HANDLED; |
d9793bd8 ACM |
1504 | partial: |
1505 | return TRACE_TYPE_PARTIAL_LINE; | |
f9896bf3 IM |
1506 | } |
1507 | ||
2c4f035f | 1508 | static enum print_line_t print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec IM |
1509 | { |
1510 | struct trace_seq *s = &iter->seq; | |
1511 | unsigned char newline = '\n'; | |
1512 | struct trace_entry *entry; | |
f633cef0 | 1513 | struct trace_event *event; |
5e3ca0ec IM |
1514 | |
1515 | entry = iter->ent; | |
dd0e545f | 1516 | |
c4a8e8be FW |
1517 | if (trace_flags & TRACE_ITER_CONTEXT_INFO) { |
1518 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); | |
1519 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); | |
1520 | SEQ_PUT_HEX_FIELD_RET(s, iter->ts); | |
1521 | } | |
5e3ca0ec | 1522 | |
f633cef0 | 1523 | event = ftrace_find_event(entry->type); |
268ccda0 | 1524 | if (event) { |
ae7462b4 | 1525 | enum print_line_t ret = event->hex(iter, 0); |
d9793bd8 ACM |
1526 | if (ret != TRACE_TYPE_HANDLED) |
1527 | return ret; | |
1528 | } | |
7104f300 | 1529 | |
5e3ca0ec IM |
1530 | SEQ_PUT_FIELD_RET(s, newline); |
1531 | ||
2c4f035f | 1532 | return TRACE_TYPE_HANDLED; |
5e3ca0ec IM |
1533 | } |
1534 | ||
66896a85 FW |
1535 | static enum print_line_t print_printk_msg_only(struct trace_iterator *iter) |
1536 | { | |
1537 | struct trace_seq *s = &iter->seq; | |
1538 | struct trace_entry *entry = iter->ent; | |
1539 | struct print_entry *field; | |
1540 | int ret; | |
1541 | ||
1542 | trace_assign_type(field, entry); | |
1543 | ||
c4a8e8be | 1544 | ret = trace_seq_printf(s, "%s", field->buf); |
66896a85 FW |
1545 | if (!ret) |
1546 | return TRACE_TYPE_PARTIAL_LINE; | |
1547 | ||
66896a85 FW |
1548 | return TRACE_TYPE_HANDLED; |
1549 | } | |
1550 | ||
2c4f035f | 1551 | static enum print_line_t print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa IM |
1552 | { |
1553 | struct trace_seq *s = &iter->seq; | |
1554 | struct trace_entry *entry; | |
f633cef0 | 1555 | struct trace_event *event; |
cb0f12aa IM |
1556 | |
1557 | entry = iter->ent; | |
dd0e545f | 1558 | |
c4a8e8be FW |
1559 | if (trace_flags & TRACE_ITER_CONTEXT_INFO) { |
1560 | SEQ_PUT_FIELD_RET(s, entry->pid); | |
1830b52d | 1561 | SEQ_PUT_FIELD_RET(s, iter->cpu); |
c4a8e8be FW |
1562 | SEQ_PUT_FIELD_RET(s, iter->ts); |
1563 | } | |
cb0f12aa | 1564 | |
f633cef0 | 1565 | event = ftrace_find_event(entry->type); |
268ccda0 | 1566 | return event ? event->binary(iter, 0) : TRACE_TYPE_HANDLED; |
cb0f12aa IM |
1567 | } |
1568 | ||
bc0c38d1 SR |
1569 | static int trace_empty(struct trace_iterator *iter) |
1570 | { | |
bc0c38d1 SR |
1571 | int cpu; |
1572 | ||
ab46428c | 1573 | for_each_tracing_cpu(cpu) { |
d769041f SR |
1574 | if (iter->buffer_iter[cpu]) { |
1575 | if (!ring_buffer_iter_empty(iter->buffer_iter[cpu])) | |
1576 | return 0; | |
1577 | } else { | |
1578 | if (!ring_buffer_empty_cpu(iter->tr->buffer, cpu)) | |
1579 | return 0; | |
1580 | } | |
bc0c38d1 | 1581 | } |
d769041f | 1582 | |
797d3712 | 1583 | return 1; |
bc0c38d1 SR |
1584 | } |
1585 | ||
2c4f035f | 1586 | static enum print_line_t print_trace_line(struct trace_iterator *iter) |
f9896bf3 | 1587 | { |
2c4f035f FW |
1588 | enum print_line_t ret; |
1589 | ||
1590 | if (iter->trace && iter->trace->print_line) { | |
1591 | ret = iter->trace->print_line(iter); | |
1592 | if (ret != TRACE_TYPE_UNHANDLED) | |
1593 | return ret; | |
1594 | } | |
72829bc3 | 1595 | |
66896a85 FW |
1596 | if (iter->ent->type == TRACE_PRINT && |
1597 | trace_flags & TRACE_ITER_PRINTK && | |
1598 | trace_flags & TRACE_ITER_PRINTK_MSGONLY) | |
1599 | return print_printk_msg_only(iter); | |
1600 | ||
cb0f12aa IM |
1601 | if (trace_flags & TRACE_ITER_BIN) |
1602 | return print_bin_fmt(iter); | |
1603 | ||
5e3ca0ec IM |
1604 | if (trace_flags & TRACE_ITER_HEX) |
1605 | return print_hex_fmt(iter); | |
1606 | ||
f9896bf3 IM |
1607 | if (trace_flags & TRACE_ITER_RAW) |
1608 | return print_raw_fmt(iter); | |
1609 | ||
1610 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
c4a8e8be | 1611 | return print_lat_fmt(iter); |
f9896bf3 IM |
1612 | |
1613 | return print_trace_fmt(iter); | |
1614 | } | |
1615 | ||
bc0c38d1 SR |
1616 | static int s_show(struct seq_file *m, void *v) |
1617 | { | |
1618 | struct trace_iterator *iter = v; | |
1619 | ||
1620 | if (iter->ent == NULL) { | |
1621 | if (iter->tr) { | |
1622 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
1623 | seq_puts(m, "#\n"); | |
1624 | } | |
8bba1bf5 MM |
1625 | if (iter->trace && iter->trace->print_header) |
1626 | iter->trace->print_header(m); | |
1627 | else if (iter->iter_flags & TRACE_FILE_LAT_FMT) { | |
bc0c38d1 SR |
1628 | /* print nothing if the buffers are empty */ |
1629 | if (trace_empty(iter)) | |
1630 | return 0; | |
1631 | print_trace_header(m, iter); | |
1632 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1633 | print_lat_help_header(m); | |
1634 | } else { | |
1635 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1636 | print_func_help_header(m); | |
1637 | } | |
1638 | } else { | |
f9896bf3 | 1639 | print_trace_line(iter); |
214023c3 | 1640 | trace_print_seq(m, &iter->seq); |
bc0c38d1 SR |
1641 | } |
1642 | ||
1643 | return 0; | |
1644 | } | |
1645 | ||
1646 | static struct seq_operations tracer_seq_ops = { | |
4bf39a94 IM |
1647 | .start = s_start, |
1648 | .next = s_next, | |
1649 | .stop = s_stop, | |
1650 | .show = s_show, | |
bc0c38d1 SR |
1651 | }; |
1652 | ||
e309b41d | 1653 | static struct trace_iterator * |
bc0c38d1 SR |
1654 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
1655 | { | |
1656 | struct trace_iterator *iter; | |
3928a8a2 SR |
1657 | struct seq_file *m; |
1658 | int cpu; | |
bc0c38d1 | 1659 | |
60a11774 SR |
1660 | if (tracing_disabled) { |
1661 | *ret = -ENODEV; | |
1662 | return NULL; | |
1663 | } | |
1664 | ||
bc0c38d1 SR |
1665 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
1666 | if (!iter) { | |
1667 | *ret = -ENOMEM; | |
1668 | goto out; | |
1669 | } | |
1670 | ||
1671 | mutex_lock(&trace_types_lock); | |
1672 | if (current_trace && current_trace->print_max) | |
1673 | iter->tr = &max_tr; | |
1674 | else | |
1675 | iter->tr = inode->i_private; | |
1676 | iter->trace = current_trace; | |
1677 | iter->pos = -1; | |
1678 | ||
8bba1bf5 MM |
1679 | /* Notify the tracer early; before we stop tracing. */ |
1680 | if (iter->trace && iter->trace->open) | |
a93751ca | 1681 | iter->trace->open(iter); |
8bba1bf5 | 1682 | |
12ef7d44 SR |
1683 | /* Annotate start of buffers if we had overruns */ |
1684 | if (ring_buffer_overruns(iter->tr->buffer)) | |
1685 | iter->iter_flags |= TRACE_FILE_ANNOTATE; | |
1686 | ||
1687 | ||
3928a8a2 | 1688 | for_each_tracing_cpu(cpu) { |
d769041f | 1689 | |
3928a8a2 SR |
1690 | iter->buffer_iter[cpu] = |
1691 | ring_buffer_read_start(iter->tr->buffer, cpu); | |
d769041f | 1692 | |
3928a8a2 SR |
1693 | if (!iter->buffer_iter[cpu]) |
1694 | goto fail_buffer; | |
1695 | } | |
1696 | ||
bc0c38d1 SR |
1697 | /* TODO stop tracer */ |
1698 | *ret = seq_open(file, &tracer_seq_ops); | |
3928a8a2 SR |
1699 | if (*ret) |
1700 | goto fail_buffer; | |
bc0c38d1 | 1701 | |
3928a8a2 SR |
1702 | m = file->private_data; |
1703 | m->private = iter; | |
bc0c38d1 | 1704 | |
3928a8a2 | 1705 | /* stop the trace while dumping */ |
9036990d | 1706 | tracing_stop(); |
3928a8a2 | 1707 | |
bc0c38d1 SR |
1708 | mutex_unlock(&trace_types_lock); |
1709 | ||
1710 | out: | |
1711 | return iter; | |
3928a8a2 SR |
1712 | |
1713 | fail_buffer: | |
1714 | for_each_tracing_cpu(cpu) { | |
1715 | if (iter->buffer_iter[cpu]) | |
1716 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
1717 | } | |
1718 | mutex_unlock(&trace_types_lock); | |
0bb943c7 | 1719 | kfree(iter); |
3928a8a2 SR |
1720 | |
1721 | return ERR_PTR(-ENOMEM); | |
bc0c38d1 SR |
1722 | } |
1723 | ||
1724 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
1725 | { | |
60a11774 SR |
1726 | if (tracing_disabled) |
1727 | return -ENODEV; | |
1728 | ||
bc0c38d1 SR |
1729 | filp->private_data = inode->i_private; |
1730 | return 0; | |
1731 | } | |
1732 | ||
4fd27358 | 1733 | static int tracing_release(struct inode *inode, struct file *file) |
bc0c38d1 SR |
1734 | { |
1735 | struct seq_file *m = (struct seq_file *)file->private_data; | |
1736 | struct trace_iterator *iter = m->private; | |
3928a8a2 | 1737 | int cpu; |
bc0c38d1 SR |
1738 | |
1739 | mutex_lock(&trace_types_lock); | |
3928a8a2 SR |
1740 | for_each_tracing_cpu(cpu) { |
1741 | if (iter->buffer_iter[cpu]) | |
1742 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
1743 | } | |
1744 | ||
bc0c38d1 SR |
1745 | if (iter->trace && iter->trace->close) |
1746 | iter->trace->close(iter); | |
1747 | ||
1748 | /* reenable tracing if it was previously enabled */ | |
9036990d | 1749 | tracing_start(); |
bc0c38d1 SR |
1750 | mutex_unlock(&trace_types_lock); |
1751 | ||
1752 | seq_release(inode, file); | |
1753 | kfree(iter); | |
1754 | return 0; | |
1755 | } | |
1756 | ||
1757 | static int tracing_open(struct inode *inode, struct file *file) | |
1758 | { | |
1759 | int ret; | |
1760 | ||
1761 | __tracing_open(inode, file, &ret); | |
1762 | ||
1763 | return ret; | |
1764 | } | |
1765 | ||
1766 | static int tracing_lt_open(struct inode *inode, struct file *file) | |
1767 | { | |
1768 | struct trace_iterator *iter; | |
1769 | int ret; | |
1770 | ||
1771 | iter = __tracing_open(inode, file, &ret); | |
1772 | ||
1773 | if (!ret) | |
1774 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
1775 | ||
1776 | return ret; | |
1777 | } | |
1778 | ||
1779 | ||
e309b41d | 1780 | static void * |
bc0c38d1 SR |
1781 | t_next(struct seq_file *m, void *v, loff_t *pos) |
1782 | { | |
1783 | struct tracer *t = m->private; | |
1784 | ||
1785 | (*pos)++; | |
1786 | ||
1787 | if (t) | |
1788 | t = t->next; | |
1789 | ||
1790 | m->private = t; | |
1791 | ||
1792 | return t; | |
1793 | } | |
1794 | ||
1795 | static void *t_start(struct seq_file *m, loff_t *pos) | |
1796 | { | |
1797 | struct tracer *t = m->private; | |
1798 | loff_t l = 0; | |
1799 | ||
1800 | mutex_lock(&trace_types_lock); | |
1801 | for (; t && l < *pos; t = t_next(m, t, &l)) | |
1802 | ; | |
1803 | ||
1804 | return t; | |
1805 | } | |
1806 | ||
1807 | static void t_stop(struct seq_file *m, void *p) | |
1808 | { | |
1809 | mutex_unlock(&trace_types_lock); | |
1810 | } | |
1811 | ||
1812 | static int t_show(struct seq_file *m, void *v) | |
1813 | { | |
1814 | struct tracer *t = v; | |
1815 | ||
1816 | if (!t) | |
1817 | return 0; | |
1818 | ||
1819 | seq_printf(m, "%s", t->name); | |
1820 | if (t->next) | |
1821 | seq_putc(m, ' '); | |
1822 | else | |
1823 | seq_putc(m, '\n'); | |
1824 | ||
1825 | return 0; | |
1826 | } | |
1827 | ||
1828 | static struct seq_operations show_traces_seq_ops = { | |
4bf39a94 IM |
1829 | .start = t_start, |
1830 | .next = t_next, | |
1831 | .stop = t_stop, | |
1832 | .show = t_show, | |
bc0c38d1 SR |
1833 | }; |
1834 | ||
1835 | static int show_traces_open(struct inode *inode, struct file *file) | |
1836 | { | |
1837 | int ret; | |
1838 | ||
60a11774 SR |
1839 | if (tracing_disabled) |
1840 | return -ENODEV; | |
1841 | ||
bc0c38d1 SR |
1842 | ret = seq_open(file, &show_traces_seq_ops); |
1843 | if (!ret) { | |
1844 | struct seq_file *m = file->private_data; | |
1845 | m->private = trace_types; | |
1846 | } | |
1847 | ||
1848 | return ret; | |
1849 | } | |
1850 | ||
1851 | static struct file_operations tracing_fops = { | |
4bf39a94 IM |
1852 | .open = tracing_open, |
1853 | .read = seq_read, | |
1854 | .llseek = seq_lseek, | |
1855 | .release = tracing_release, | |
bc0c38d1 SR |
1856 | }; |
1857 | ||
1858 | static struct file_operations tracing_lt_fops = { | |
4bf39a94 IM |
1859 | .open = tracing_lt_open, |
1860 | .read = seq_read, | |
1861 | .llseek = seq_lseek, | |
1862 | .release = tracing_release, | |
bc0c38d1 SR |
1863 | }; |
1864 | ||
1865 | static struct file_operations show_traces_fops = { | |
c7078de1 IM |
1866 | .open = show_traces_open, |
1867 | .read = seq_read, | |
1868 | .release = seq_release, | |
1869 | }; | |
1870 | ||
36dfe925 IM |
1871 | /* |
1872 | * Only trace on a CPU if the bitmask is set: | |
1873 | */ | |
9e01c1b7 | 1874 | static cpumask_var_t tracing_cpumask; |
36dfe925 IM |
1875 | |
1876 | /* | |
1877 | * The tracer itself will not take this lock, but still we want | |
1878 | * to provide a consistent cpumask to user-space: | |
1879 | */ | |
1880 | static DEFINE_MUTEX(tracing_cpumask_update_lock); | |
1881 | ||
1882 | /* | |
1883 | * Temporary storage for the character representation of the | |
1884 | * CPU bitmask (and one more byte for the newline): | |
1885 | */ | |
1886 | static char mask_str[NR_CPUS + 1]; | |
1887 | ||
c7078de1 IM |
1888 | static ssize_t |
1889 | tracing_cpumask_read(struct file *filp, char __user *ubuf, | |
1890 | size_t count, loff_t *ppos) | |
1891 | { | |
36dfe925 | 1892 | int len; |
c7078de1 IM |
1893 | |
1894 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 | 1895 | |
9e01c1b7 | 1896 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); |
36dfe925 IM |
1897 | if (count - len < 2) { |
1898 | count = -EINVAL; | |
1899 | goto out_err; | |
1900 | } | |
1901 | len += sprintf(mask_str + len, "\n"); | |
1902 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); | |
1903 | ||
1904 | out_err: | |
c7078de1 IM |
1905 | mutex_unlock(&tracing_cpumask_update_lock); |
1906 | ||
1907 | return count; | |
1908 | } | |
1909 | ||
1910 | static ssize_t | |
1911 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, | |
1912 | size_t count, loff_t *ppos) | |
1913 | { | |
36dfe925 | 1914 | int err, cpu; |
9e01c1b7 RR |
1915 | cpumask_var_t tracing_cpumask_new; |
1916 | ||
1917 | if (!alloc_cpumask_var(&tracing_cpumask_new, GFP_KERNEL)) | |
1918 | return -ENOMEM; | |
c7078de1 IM |
1919 | |
1920 | mutex_lock(&tracing_cpumask_update_lock); | |
9e01c1b7 | 1921 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
c7078de1 | 1922 | if (err) |
36dfe925 IM |
1923 | goto err_unlock; |
1924 | ||
a5e25883 | 1925 | local_irq_disable(); |
92205c23 | 1926 | __raw_spin_lock(&ftrace_max_lock); |
ab46428c | 1927 | for_each_tracing_cpu(cpu) { |
36dfe925 IM |
1928 | /* |
1929 | * Increase/decrease the disabled counter if we are | |
1930 | * about to flip a bit in the cpumask: | |
1931 | */ | |
9e01c1b7 RR |
1932 | if (cpumask_test_cpu(cpu, tracing_cpumask) && |
1933 | !cpumask_test_cpu(cpu, tracing_cpumask_new)) { | |
36dfe925 IM |
1934 | atomic_inc(&global_trace.data[cpu]->disabled); |
1935 | } | |
9e01c1b7 RR |
1936 | if (!cpumask_test_cpu(cpu, tracing_cpumask) && |
1937 | cpumask_test_cpu(cpu, tracing_cpumask_new)) { | |
36dfe925 IM |
1938 | atomic_dec(&global_trace.data[cpu]->disabled); |
1939 | } | |
1940 | } | |
92205c23 | 1941 | __raw_spin_unlock(&ftrace_max_lock); |
a5e25883 | 1942 | local_irq_enable(); |
36dfe925 | 1943 | |
9e01c1b7 | 1944 | cpumask_copy(tracing_cpumask, tracing_cpumask_new); |
36dfe925 IM |
1945 | |
1946 | mutex_unlock(&tracing_cpumask_update_lock); | |
9e01c1b7 | 1947 | free_cpumask_var(tracing_cpumask_new); |
c7078de1 IM |
1948 | |
1949 | return count; | |
36dfe925 IM |
1950 | |
1951 | err_unlock: | |
1952 | mutex_unlock(&tracing_cpumask_update_lock); | |
9e01c1b7 | 1953 | free_cpumask_var(tracing_cpumask); |
36dfe925 IM |
1954 | |
1955 | return err; | |
c7078de1 IM |
1956 | } |
1957 | ||
1958 | static struct file_operations tracing_cpumask_fops = { | |
1959 | .open = tracing_open_generic, | |
1960 | .read = tracing_cpumask_read, | |
1961 | .write = tracing_cpumask_write, | |
bc0c38d1 SR |
1962 | }; |
1963 | ||
1964 | static ssize_t | |
ee6bce52 | 1965 | tracing_trace_options_read(struct file *filp, char __user *ubuf, |
bc0c38d1 SR |
1966 | size_t cnt, loff_t *ppos) |
1967 | { | |
adf9f195 | 1968 | int i; |
bc0c38d1 SR |
1969 | char *buf; |
1970 | int r = 0; | |
1971 | int len = 0; | |
adf9f195 FW |
1972 | u32 tracer_flags = current_trace->flags->val; |
1973 | struct tracer_opt *trace_opts = current_trace->flags->opts; | |
1974 | ||
bc0c38d1 | 1975 | |
c3706f00 | 1976 | /* calculate max size */ |
bc0c38d1 SR |
1977 | for (i = 0; trace_options[i]; i++) { |
1978 | len += strlen(trace_options[i]); | |
1979 | len += 3; /* "no" and space */ | |
1980 | } | |
1981 | ||
adf9f195 FW |
1982 | /* |
1983 | * Increase the size with names of options specific | |
1984 | * of the current tracer. | |
1985 | */ | |
1986 | for (i = 0; trace_opts[i].name; i++) { | |
1987 | len += strlen(trace_opts[i].name); | |
1988 | len += 3; /* "no" and space */ | |
1989 | } | |
1990 | ||
bc0c38d1 SR |
1991 | /* +2 for \n and \0 */ |
1992 | buf = kmalloc(len + 2, GFP_KERNEL); | |
1993 | if (!buf) | |
1994 | return -ENOMEM; | |
1995 | ||
1996 | for (i = 0; trace_options[i]; i++) { | |
1997 | if (trace_flags & (1 << i)) | |
1998 | r += sprintf(buf + r, "%s ", trace_options[i]); | |
1999 | else | |
2000 | r += sprintf(buf + r, "no%s ", trace_options[i]); | |
2001 | } | |
2002 | ||
adf9f195 FW |
2003 | for (i = 0; trace_opts[i].name; i++) { |
2004 | if (tracer_flags & trace_opts[i].bit) | |
2005 | r += sprintf(buf + r, "%s ", | |
2006 | trace_opts[i].name); | |
2007 | else | |
2008 | r += sprintf(buf + r, "no%s ", | |
2009 | trace_opts[i].name); | |
2010 | } | |
2011 | ||
bc0c38d1 SR |
2012 | r += sprintf(buf + r, "\n"); |
2013 | WARN_ON(r >= len + 2); | |
2014 | ||
36dfe925 | 2015 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2016 | |
2017 | kfree(buf); | |
2018 | ||
2019 | return r; | |
2020 | } | |
2021 | ||
adf9f195 FW |
2022 | /* Try to assign a tracer specific option */ |
2023 | static int set_tracer_option(struct tracer *trace, char *cmp, int neg) | |
2024 | { | |
2025 | struct tracer_flags *trace_flags = trace->flags; | |
2026 | struct tracer_opt *opts = NULL; | |
2027 | int ret = 0, i = 0; | |
2028 | int len; | |
2029 | ||
2030 | for (i = 0; trace_flags->opts[i].name; i++) { | |
2031 | opts = &trace_flags->opts[i]; | |
2032 | len = strlen(opts->name); | |
2033 | ||
2034 | if (strncmp(cmp, opts->name, len) == 0) { | |
2035 | ret = trace->set_flag(trace_flags->val, | |
2036 | opts->bit, !neg); | |
2037 | break; | |
2038 | } | |
2039 | } | |
2040 | /* Not found */ | |
2041 | if (!trace_flags->opts[i].name) | |
2042 | return -EINVAL; | |
2043 | ||
2044 | /* Refused to handle */ | |
2045 | if (ret) | |
2046 | return ret; | |
2047 | ||
2048 | if (neg) | |
2049 | trace_flags->val &= ~opts->bit; | |
2050 | else | |
2051 | trace_flags->val |= opts->bit; | |
2052 | ||
2053 | return 0; | |
2054 | } | |
2055 | ||
bc0c38d1 | 2056 | static ssize_t |
ee6bce52 | 2057 | tracing_trace_options_write(struct file *filp, const char __user *ubuf, |
bc0c38d1 SR |
2058 | size_t cnt, loff_t *ppos) |
2059 | { | |
2060 | char buf[64]; | |
2061 | char *cmp = buf; | |
2062 | int neg = 0; | |
adf9f195 | 2063 | int ret; |
bc0c38d1 SR |
2064 | int i; |
2065 | ||
cffae437 SR |
2066 | if (cnt >= sizeof(buf)) |
2067 | return -EINVAL; | |
bc0c38d1 SR |
2068 | |
2069 | if (copy_from_user(&buf, ubuf, cnt)) | |
2070 | return -EFAULT; | |
2071 | ||
2072 | buf[cnt] = 0; | |
2073 | ||
2074 | if (strncmp(buf, "no", 2) == 0) { | |
2075 | neg = 1; | |
2076 | cmp += 2; | |
2077 | } | |
2078 | ||
2079 | for (i = 0; trace_options[i]; i++) { | |
2080 | int len = strlen(trace_options[i]); | |
2081 | ||
2082 | if (strncmp(cmp, trace_options[i], len) == 0) { | |
2083 | if (neg) | |
2084 | trace_flags &= ~(1 << i); | |
2085 | else | |
2086 | trace_flags |= (1 << i); | |
2087 | break; | |
2088 | } | |
2089 | } | |
adf9f195 FW |
2090 | |
2091 | /* If no option could be set, test the specific tracer options */ | |
2092 | if (!trace_options[i]) { | |
2093 | ret = set_tracer_option(current_trace, cmp, neg); | |
2094 | if (ret) | |
2095 | return ret; | |
2096 | } | |
bc0c38d1 SR |
2097 | |
2098 | filp->f_pos += cnt; | |
2099 | ||
2100 | return cnt; | |
2101 | } | |
2102 | ||
2103 | static struct file_operations tracing_iter_fops = { | |
c7078de1 | 2104 | .open = tracing_open_generic, |
ee6bce52 SR |
2105 | .read = tracing_trace_options_read, |
2106 | .write = tracing_trace_options_write, | |
bc0c38d1 SR |
2107 | }; |
2108 | ||
7bd2f24c IM |
2109 | static const char readme_msg[] = |
2110 | "tracing mini-HOWTO:\n\n" | |
2111 | "# mkdir /debug\n" | |
2112 | "# mount -t debugfs nodev /debug\n\n" | |
2113 | "# cat /debug/tracing/available_tracers\n" | |
2114 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" | |
2115 | "# cat /debug/tracing/current_tracer\n" | |
2116 | "none\n" | |
2117 | "# echo sched_switch > /debug/tracing/current_tracer\n" | |
2118 | "# cat /debug/tracing/current_tracer\n" | |
2119 | "sched_switch\n" | |
ee6bce52 | 2120 | "# cat /debug/tracing/trace_options\n" |
7bd2f24c | 2121 | "noprint-parent nosym-offset nosym-addr noverbose\n" |
ee6bce52 | 2122 | "# echo print-parent > /debug/tracing/trace_options\n" |
7bd2f24c IM |
2123 | "# echo 1 > /debug/tracing/tracing_enabled\n" |
2124 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" | |
2125 | "echo 0 > /debug/tracing/tracing_enabled\n" | |
2126 | ; | |
2127 | ||
2128 | static ssize_t | |
2129 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
2130 | size_t cnt, loff_t *ppos) | |
2131 | { | |
2132 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
2133 | readme_msg, strlen(readme_msg)); | |
2134 | } | |
2135 | ||
2136 | static struct file_operations tracing_readme_fops = { | |
c7078de1 IM |
2137 | .open = tracing_open_generic, |
2138 | .read = tracing_readme_read, | |
7bd2f24c IM |
2139 | }; |
2140 | ||
bc0c38d1 SR |
2141 | static ssize_t |
2142 | tracing_ctrl_read(struct file *filp, char __user *ubuf, | |
2143 | size_t cnt, loff_t *ppos) | |
2144 | { | |
bc0c38d1 SR |
2145 | char buf[64]; |
2146 | int r; | |
2147 | ||
9036990d | 2148 | r = sprintf(buf, "%u\n", tracer_enabled); |
4e3c3333 | 2149 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2150 | } |
2151 | ||
2152 | static ssize_t | |
2153 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, | |
2154 | size_t cnt, loff_t *ppos) | |
2155 | { | |
2156 | struct trace_array *tr = filp->private_data; | |
bc0c38d1 | 2157 | char buf[64]; |
5e39841c | 2158 | unsigned long val; |
c6caeeb1 | 2159 | int ret; |
bc0c38d1 | 2160 | |
cffae437 SR |
2161 | if (cnt >= sizeof(buf)) |
2162 | return -EINVAL; | |
bc0c38d1 SR |
2163 | |
2164 | if (copy_from_user(&buf, ubuf, cnt)) | |
2165 | return -EFAULT; | |
2166 | ||
2167 | buf[cnt] = 0; | |
2168 | ||
c6caeeb1 SR |
2169 | ret = strict_strtoul(buf, 10, &val); |
2170 | if (ret < 0) | |
2171 | return ret; | |
bc0c38d1 SR |
2172 | |
2173 | val = !!val; | |
2174 | ||
2175 | mutex_lock(&trace_types_lock); | |
9036990d SR |
2176 | if (tracer_enabled ^ val) { |
2177 | if (val) { | |
bc0c38d1 | 2178 | tracer_enabled = 1; |
9036990d SR |
2179 | if (current_trace->start) |
2180 | current_trace->start(tr); | |
2181 | tracing_start(); | |
2182 | } else { | |
bc0c38d1 | 2183 | tracer_enabled = 0; |
9036990d SR |
2184 | tracing_stop(); |
2185 | if (current_trace->stop) | |
2186 | current_trace->stop(tr); | |
2187 | } | |
bc0c38d1 SR |
2188 | } |
2189 | mutex_unlock(&trace_types_lock); | |
2190 | ||
2191 | filp->f_pos += cnt; | |
2192 | ||
2193 | return cnt; | |
2194 | } | |
2195 | ||
2196 | static ssize_t | |
2197 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
2198 | size_t cnt, loff_t *ppos) | |
2199 | { | |
2200 | char buf[max_tracer_type_len+2]; | |
2201 | int r; | |
2202 | ||
2203 | mutex_lock(&trace_types_lock); | |
2204 | if (current_trace) | |
2205 | r = sprintf(buf, "%s\n", current_trace->name); | |
2206 | else | |
2207 | r = sprintf(buf, "\n"); | |
2208 | mutex_unlock(&trace_types_lock); | |
2209 | ||
4bf39a94 | 2210 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2211 | } |
2212 | ||
b6f11df2 ACM |
2213 | int tracer_init(struct tracer *t, struct trace_array *tr) |
2214 | { | |
2215 | tracing_reset_online_cpus(tr); | |
2216 | return t->init(tr); | |
2217 | } | |
2218 | ||
b2821ae6 | 2219 | static int tracing_set_tracer(const char *buf) |
bc0c38d1 SR |
2220 | { |
2221 | struct trace_array *tr = &global_trace; | |
2222 | struct tracer *t; | |
d9e54076 | 2223 | int ret = 0; |
bc0c38d1 SR |
2224 | |
2225 | mutex_lock(&trace_types_lock); | |
2226 | for (t = trace_types; t; t = t->next) { | |
2227 | if (strcmp(t->name, buf) == 0) | |
2228 | break; | |
2229 | } | |
c2931e05 FW |
2230 | if (!t) { |
2231 | ret = -EINVAL; | |
2232 | goto out; | |
2233 | } | |
2234 | if (t == current_trace) | |
bc0c38d1 SR |
2235 | goto out; |
2236 | ||
9f029e83 | 2237 | trace_branch_disable(); |
bc0c38d1 SR |
2238 | if (current_trace && current_trace->reset) |
2239 | current_trace->reset(tr); | |
2240 | ||
2241 | current_trace = t; | |
1c80025a | 2242 | if (t->init) { |
b6f11df2 | 2243 | ret = tracer_init(t, tr); |
1c80025a FW |
2244 | if (ret) |
2245 | goto out; | |
2246 | } | |
bc0c38d1 | 2247 | |
9f029e83 | 2248 | trace_branch_enable(tr); |
bc0c38d1 SR |
2249 | out: |
2250 | mutex_unlock(&trace_types_lock); | |
2251 | ||
d9e54076 PZ |
2252 | return ret; |
2253 | } | |
2254 | ||
2255 | static ssize_t | |
2256 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
2257 | size_t cnt, loff_t *ppos) | |
2258 | { | |
2259 | char buf[max_tracer_type_len+1]; | |
2260 | int i; | |
2261 | size_t ret; | |
e6e7a65a FW |
2262 | int err; |
2263 | ||
2264 | ret = cnt; | |
d9e54076 PZ |
2265 | |
2266 | if (cnt > max_tracer_type_len) | |
2267 | cnt = max_tracer_type_len; | |
2268 | ||
2269 | if (copy_from_user(&buf, ubuf, cnt)) | |
2270 | return -EFAULT; | |
2271 | ||
2272 | buf[cnt] = 0; | |
2273 | ||
2274 | /* strip ending whitespace. */ | |
2275 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
2276 | buf[i] = 0; | |
2277 | ||
e6e7a65a FW |
2278 | err = tracing_set_tracer(buf); |
2279 | if (err) | |
2280 | return err; | |
d9e54076 | 2281 | |
e6e7a65a | 2282 | filp->f_pos += ret; |
bc0c38d1 | 2283 | |
c2931e05 | 2284 | return ret; |
bc0c38d1 SR |
2285 | } |
2286 | ||
2287 | static ssize_t | |
2288 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
2289 | size_t cnt, loff_t *ppos) | |
2290 | { | |
2291 | unsigned long *ptr = filp->private_data; | |
2292 | char buf[64]; | |
2293 | int r; | |
2294 | ||
cffae437 | 2295 | r = snprintf(buf, sizeof(buf), "%ld\n", |
bc0c38d1 | 2296 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
cffae437 SR |
2297 | if (r > sizeof(buf)) |
2298 | r = sizeof(buf); | |
4bf39a94 | 2299 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2300 | } |
2301 | ||
2302 | static ssize_t | |
2303 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
2304 | size_t cnt, loff_t *ppos) | |
2305 | { | |
5e39841c | 2306 | unsigned long *ptr = filp->private_data; |
bc0c38d1 | 2307 | char buf[64]; |
5e39841c | 2308 | unsigned long val; |
c6caeeb1 | 2309 | int ret; |
bc0c38d1 | 2310 | |
cffae437 SR |
2311 | if (cnt >= sizeof(buf)) |
2312 | return -EINVAL; | |
bc0c38d1 SR |
2313 | |
2314 | if (copy_from_user(&buf, ubuf, cnt)) | |
2315 | return -EFAULT; | |
2316 | ||
2317 | buf[cnt] = 0; | |
2318 | ||
c6caeeb1 SR |
2319 | ret = strict_strtoul(buf, 10, &val); |
2320 | if (ret < 0) | |
2321 | return ret; | |
bc0c38d1 SR |
2322 | |
2323 | *ptr = val * 1000; | |
2324 | ||
2325 | return cnt; | |
2326 | } | |
2327 | ||
b3806b43 SR |
2328 | static atomic_t tracing_reader; |
2329 | ||
2330 | static int tracing_open_pipe(struct inode *inode, struct file *filp) | |
2331 | { | |
2332 | struct trace_iterator *iter; | |
2333 | ||
2334 | if (tracing_disabled) | |
2335 | return -ENODEV; | |
2336 | ||
2337 | /* We only allow for reader of the pipe */ | |
2338 | if (atomic_inc_return(&tracing_reader) != 1) { | |
2339 | atomic_dec(&tracing_reader); | |
2340 | return -EBUSY; | |
2341 | } | |
2342 | ||
2343 | /* create a buffer to store the information to pass to userspace */ | |
2344 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
2345 | if (!iter) | |
2346 | return -ENOMEM; | |
2347 | ||
4462344e RR |
2348 | if (!alloc_cpumask_var(&iter->started, GFP_KERNEL)) { |
2349 | kfree(iter); | |
2350 | return -ENOMEM; | |
2351 | } | |
2352 | ||
107bad8b | 2353 | mutex_lock(&trace_types_lock); |
a309720c SR |
2354 | |
2355 | /* trace pipe does not show start of buffer */ | |
4462344e | 2356 | cpumask_setall(iter->started); |
a309720c | 2357 | |
b3806b43 | 2358 | iter->tr = &global_trace; |
72829bc3 | 2359 | iter->trace = current_trace; |
b3806b43 SR |
2360 | filp->private_data = iter; |
2361 | ||
107bad8b SR |
2362 | if (iter->trace->pipe_open) |
2363 | iter->trace->pipe_open(iter); | |
2364 | mutex_unlock(&trace_types_lock); | |
2365 | ||
b3806b43 SR |
2366 | return 0; |
2367 | } | |
2368 | ||
2369 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
2370 | { | |
2371 | struct trace_iterator *iter = file->private_data; | |
2372 | ||
4462344e | 2373 | free_cpumask_var(iter->started); |
b3806b43 SR |
2374 | kfree(iter); |
2375 | atomic_dec(&tracing_reader); | |
2376 | ||
2377 | return 0; | |
2378 | } | |
2379 | ||
2a2cc8f7 SSP |
2380 | static unsigned int |
2381 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) | |
2382 | { | |
2383 | struct trace_iterator *iter = filp->private_data; | |
2384 | ||
2385 | if (trace_flags & TRACE_ITER_BLOCK) { | |
2386 | /* | |
2387 | * Always select as readable when in blocking mode | |
2388 | */ | |
2389 | return POLLIN | POLLRDNORM; | |
afc2abc0 | 2390 | } else { |
2a2cc8f7 SSP |
2391 | if (!trace_empty(iter)) |
2392 | return POLLIN | POLLRDNORM; | |
2393 | poll_wait(filp, &trace_wait, poll_table); | |
2394 | if (!trace_empty(iter)) | |
2395 | return POLLIN | POLLRDNORM; | |
2396 | ||
2397 | return 0; | |
2398 | } | |
2399 | } | |
2400 | ||
6eaaa5d5 FW |
2401 | |
2402 | void default_wait_pipe(struct trace_iterator *iter) | |
2403 | { | |
2404 | DEFINE_WAIT(wait); | |
2405 | ||
2406 | prepare_to_wait(&trace_wait, &wait, TASK_INTERRUPTIBLE); | |
2407 | ||
2408 | if (trace_empty(iter)) | |
2409 | schedule(); | |
2410 | ||
2411 | finish_wait(&trace_wait, &wait); | |
2412 | } | |
2413 | ||
2414 | /* | |
2415 | * This is a make-shift waitqueue. | |
2416 | * A tracer might use this callback on some rare cases: | |
2417 | * | |
2418 | * 1) the current tracer might hold the runqueue lock when it wakes up | |
2419 | * a reader, hence a deadlock (sched, function, and function graph tracers) | |
2420 | * 2) the function tracers, trace all functions, we don't want | |
2421 | * the overhead of calling wake_up and friends | |
2422 | * (and tracing them too) | |
2423 | * | |
2424 | * Anyway, this is really very primitive wakeup. | |
2425 | */ | |
2426 | void poll_wait_pipe(struct trace_iterator *iter) | |
2427 | { | |
2428 | set_current_state(TASK_INTERRUPTIBLE); | |
2429 | /* sleep for 100 msecs, and try again. */ | |
2430 | schedule_timeout(HZ / 10); | |
2431 | } | |
2432 | ||
ff98781b EGM |
2433 | /* Must be called with trace_types_lock mutex held. */ |
2434 | static int tracing_wait_pipe(struct file *filp) | |
b3806b43 SR |
2435 | { |
2436 | struct trace_iterator *iter = filp->private_data; | |
b3806b43 | 2437 | |
b3806b43 | 2438 | while (trace_empty(iter)) { |
2dc8f095 | 2439 | |
107bad8b | 2440 | if ((filp->f_flags & O_NONBLOCK)) { |
ff98781b | 2441 | return -EAGAIN; |
107bad8b | 2442 | } |
2dc8f095 | 2443 | |
107bad8b SR |
2444 | mutex_unlock(&trace_types_lock); |
2445 | ||
6eaaa5d5 | 2446 | iter->trace->wait_pipe(iter); |
b3806b43 | 2447 | |
107bad8b SR |
2448 | mutex_lock(&trace_types_lock); |
2449 | ||
6eaaa5d5 | 2450 | if (signal_pending(current)) |
ff98781b | 2451 | return -EINTR; |
b3806b43 | 2452 | |
84527997 | 2453 | if (iter->trace != current_trace) |
ff98781b | 2454 | return 0; |
84527997 | 2455 | |
b3806b43 SR |
2456 | /* |
2457 | * We block until we read something and tracing is disabled. | |
2458 | * We still block if tracing is disabled, but we have never | |
2459 | * read anything. This allows a user to cat this file, and | |
2460 | * then enable tracing. But after we have read something, | |
2461 | * we give an EOF when tracing is again disabled. | |
2462 | * | |
2463 | * iter->pos will be 0 if we haven't read anything. | |
2464 | */ | |
2465 | if (!tracer_enabled && iter->pos) | |
2466 | break; | |
b3806b43 SR |
2467 | } |
2468 | ||
ff98781b EGM |
2469 | return 1; |
2470 | } | |
2471 | ||
2472 | /* | |
2473 | * Consumer reader. | |
2474 | */ | |
2475 | static ssize_t | |
2476 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
2477 | size_t cnt, loff_t *ppos) | |
2478 | { | |
2479 | struct trace_iterator *iter = filp->private_data; | |
2480 | ssize_t sret; | |
2481 | ||
2482 | /* return any leftover data */ | |
2483 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); | |
2484 | if (sret != -EBUSY) | |
2485 | return sret; | |
2486 | ||
2487 | trace_seq_reset(&iter->seq); | |
2488 | ||
2489 | mutex_lock(&trace_types_lock); | |
2490 | if (iter->trace->read) { | |
2491 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); | |
2492 | if (sret) | |
2493 | goto out; | |
2494 | } | |
2495 | ||
2496 | waitagain: | |
2497 | sret = tracing_wait_pipe(filp); | |
2498 | if (sret <= 0) | |
2499 | goto out; | |
2500 | ||
b3806b43 | 2501 | /* stop when tracing is finished */ |
ff98781b EGM |
2502 | if (trace_empty(iter)) { |
2503 | sret = 0; | |
107bad8b | 2504 | goto out; |
ff98781b | 2505 | } |
b3806b43 SR |
2506 | |
2507 | if (cnt >= PAGE_SIZE) | |
2508 | cnt = PAGE_SIZE - 1; | |
2509 | ||
53d0aa77 | 2510 | /* reset all but tr, trace, and overruns */ |
53d0aa77 SR |
2511 | memset(&iter->seq, 0, |
2512 | sizeof(struct trace_iterator) - | |
2513 | offsetof(struct trace_iterator, seq)); | |
4823ed7e | 2514 | iter->pos = -1; |
b3806b43 | 2515 | |
088b1e42 | 2516 | while (find_next_entry_inc(iter) != NULL) { |
2c4f035f | 2517 | enum print_line_t ret; |
088b1e42 SR |
2518 | int len = iter->seq.len; |
2519 | ||
f9896bf3 | 2520 | ret = print_trace_line(iter); |
2c4f035f | 2521 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
088b1e42 SR |
2522 | /* don't print partial lines */ |
2523 | iter->seq.len = len; | |
b3806b43 | 2524 | break; |
088b1e42 | 2525 | } |
b91facc3 FW |
2526 | if (ret != TRACE_TYPE_NO_CONSUME) |
2527 | trace_consume(iter); | |
b3806b43 SR |
2528 | |
2529 | if (iter->seq.len >= cnt) | |
2530 | break; | |
b3806b43 SR |
2531 | } |
2532 | ||
b3806b43 | 2533 | /* Now copy what we have to the user */ |
6c6c2796 PP |
2534 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
2535 | if (iter->seq.readpos >= iter->seq.len) | |
b3806b43 | 2536 | trace_seq_reset(&iter->seq); |
9ff4b974 PP |
2537 | |
2538 | /* | |
2539 | * If there was nothing to send to user, inspite of consuming trace | |
2540 | * entries, go back to wait for more entries. | |
2541 | */ | |
6c6c2796 | 2542 | if (sret == -EBUSY) |
9ff4b974 | 2543 | goto waitagain; |
b3806b43 | 2544 | |
107bad8b SR |
2545 | out: |
2546 | mutex_unlock(&trace_types_lock); | |
2547 | ||
6c6c2796 | 2548 | return sret; |
b3806b43 SR |
2549 | } |
2550 | ||
3c56819b EGM |
2551 | static void tracing_pipe_buf_release(struct pipe_inode_info *pipe, |
2552 | struct pipe_buffer *buf) | |
2553 | { | |
2554 | __free_page(buf->page); | |
2555 | } | |
2556 | ||
2557 | static void tracing_spd_release_pipe(struct splice_pipe_desc *spd, | |
2558 | unsigned int idx) | |
2559 | { | |
2560 | __free_page(spd->pages[idx]); | |
2561 | } | |
2562 | ||
2563 | static struct pipe_buf_operations tracing_pipe_buf_ops = { | |
34cd4998 SR |
2564 | .can_merge = 0, |
2565 | .map = generic_pipe_buf_map, | |
2566 | .unmap = generic_pipe_buf_unmap, | |
2567 | .confirm = generic_pipe_buf_confirm, | |
2568 | .release = tracing_pipe_buf_release, | |
2569 | .steal = generic_pipe_buf_steal, | |
2570 | .get = generic_pipe_buf_get, | |
3c56819b EGM |
2571 | }; |
2572 | ||
34cd4998 | 2573 | static size_t |
fa7c7f6e | 2574 | tracing_fill_pipe_page(size_t rem, struct trace_iterator *iter) |
34cd4998 SR |
2575 | { |
2576 | size_t count; | |
2577 | int ret; | |
2578 | ||
2579 | /* Seq buffer is page-sized, exactly what we need. */ | |
2580 | for (;;) { | |
2581 | count = iter->seq.len; | |
2582 | ret = print_trace_line(iter); | |
2583 | count = iter->seq.len - count; | |
2584 | if (rem < count) { | |
2585 | rem = 0; | |
2586 | iter->seq.len -= count; | |
2587 | break; | |
2588 | } | |
2589 | if (ret == TRACE_TYPE_PARTIAL_LINE) { | |
2590 | iter->seq.len -= count; | |
2591 | break; | |
2592 | } | |
2593 | ||
2594 | trace_consume(iter); | |
2595 | rem -= count; | |
2596 | if (!find_next_entry_inc(iter)) { | |
2597 | rem = 0; | |
2598 | iter->ent = NULL; | |
2599 | break; | |
2600 | } | |
2601 | } | |
2602 | ||
2603 | return rem; | |
2604 | } | |
2605 | ||
3c56819b EGM |
2606 | static ssize_t tracing_splice_read_pipe(struct file *filp, |
2607 | loff_t *ppos, | |
2608 | struct pipe_inode_info *pipe, | |
2609 | size_t len, | |
2610 | unsigned int flags) | |
2611 | { | |
2612 | struct page *pages[PIPE_BUFFERS]; | |
2613 | struct partial_page partial[PIPE_BUFFERS]; | |
2614 | struct trace_iterator *iter = filp->private_data; | |
2615 | struct splice_pipe_desc spd = { | |
34cd4998 SR |
2616 | .pages = pages, |
2617 | .partial = partial, | |
2618 | .nr_pages = 0, /* This gets updated below. */ | |
2619 | .flags = flags, | |
2620 | .ops = &tracing_pipe_buf_ops, | |
2621 | .spd_release = tracing_spd_release_pipe, | |
3c56819b EGM |
2622 | }; |
2623 | ssize_t ret; | |
34cd4998 | 2624 | size_t rem; |
3c56819b EGM |
2625 | unsigned int i; |
2626 | ||
2627 | mutex_lock(&trace_types_lock); | |
2628 | ||
2629 | if (iter->trace->splice_read) { | |
2630 | ret = iter->trace->splice_read(iter, filp, | |
2631 | ppos, pipe, len, flags); | |
2632 | if (ret) | |
34cd4998 | 2633 | goto out_err; |
3c56819b EGM |
2634 | } |
2635 | ||
2636 | ret = tracing_wait_pipe(filp); | |
2637 | if (ret <= 0) | |
34cd4998 | 2638 | goto out_err; |
3c56819b EGM |
2639 | |
2640 | if (!iter->ent && !find_next_entry_inc(iter)) { | |
2641 | ret = -EFAULT; | |
34cd4998 | 2642 | goto out_err; |
3c56819b EGM |
2643 | } |
2644 | ||
2645 | /* Fill as many pages as possible. */ | |
2646 | for (i = 0, rem = len; i < PIPE_BUFFERS && rem; i++) { | |
2647 | pages[i] = alloc_page(GFP_KERNEL); | |
34cd4998 SR |
2648 | if (!pages[i]) |
2649 | break; | |
3c56819b | 2650 | |
fa7c7f6e | 2651 | rem = tracing_fill_pipe_page(rem, iter); |
3c56819b EGM |
2652 | |
2653 | /* Copy the data into the page, so we can start over. */ | |
2654 | ret = trace_seq_to_buffer(&iter->seq, | |
2655 | page_address(pages[i]), | |
2656 | iter->seq.len); | |
2657 | if (ret < 0) { | |
2658 | __free_page(pages[i]); | |
2659 | break; | |
2660 | } | |
2661 | partial[i].offset = 0; | |
2662 | partial[i].len = iter->seq.len; | |
2663 | ||
2664 | trace_seq_reset(&iter->seq); | |
2665 | } | |
2666 | ||
2667 | mutex_unlock(&trace_types_lock); | |
2668 | ||
2669 | spd.nr_pages = i; | |
2670 | ||
2671 | return splice_to_pipe(pipe, &spd); | |
2672 | ||
34cd4998 | 2673 | out_err: |
3c56819b EGM |
2674 | mutex_unlock(&trace_types_lock); |
2675 | ||
2676 | return ret; | |
2677 | } | |
2678 | ||
a98a3c3f SR |
2679 | static ssize_t |
2680 | tracing_entries_read(struct file *filp, char __user *ubuf, | |
2681 | size_t cnt, loff_t *ppos) | |
2682 | { | |
2683 | struct trace_array *tr = filp->private_data; | |
2684 | char buf[64]; | |
2685 | int r; | |
2686 | ||
1696b2b0 | 2687 | r = sprintf(buf, "%lu\n", tr->entries >> 10); |
a98a3c3f SR |
2688 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
2689 | } | |
2690 | ||
2691 | static ssize_t | |
2692 | tracing_entries_write(struct file *filp, const char __user *ubuf, | |
2693 | size_t cnt, loff_t *ppos) | |
2694 | { | |
2695 | unsigned long val; | |
2696 | char buf[64]; | |
bf5e6519 | 2697 | int ret, cpu; |
a98a3c3f | 2698 | |
cffae437 SR |
2699 | if (cnt >= sizeof(buf)) |
2700 | return -EINVAL; | |
a98a3c3f SR |
2701 | |
2702 | if (copy_from_user(&buf, ubuf, cnt)) | |
2703 | return -EFAULT; | |
2704 | ||
2705 | buf[cnt] = 0; | |
2706 | ||
c6caeeb1 SR |
2707 | ret = strict_strtoul(buf, 10, &val); |
2708 | if (ret < 0) | |
2709 | return ret; | |
a98a3c3f SR |
2710 | |
2711 | /* must have at least 1 entry */ | |
2712 | if (!val) | |
2713 | return -EINVAL; | |
2714 | ||
2715 | mutex_lock(&trace_types_lock); | |
2716 | ||
c76f0694 | 2717 | tracing_stop(); |
a98a3c3f | 2718 | |
bf5e6519 SR |
2719 | /* disable all cpu buffers */ |
2720 | for_each_tracing_cpu(cpu) { | |
2721 | if (global_trace.data[cpu]) | |
2722 | atomic_inc(&global_trace.data[cpu]->disabled); | |
2723 | if (max_tr.data[cpu]) | |
2724 | atomic_inc(&max_tr.data[cpu]->disabled); | |
2725 | } | |
2726 | ||
1696b2b0 SR |
2727 | /* value is in KB */ |
2728 | val <<= 10; | |
2729 | ||
3928a8a2 SR |
2730 | if (val != global_trace.entries) { |
2731 | ret = ring_buffer_resize(global_trace.buffer, val); | |
2732 | if (ret < 0) { | |
2733 | cnt = ret; | |
3eefae99 SR |
2734 | goto out; |
2735 | } | |
2736 | ||
3928a8a2 SR |
2737 | ret = ring_buffer_resize(max_tr.buffer, val); |
2738 | if (ret < 0) { | |
2739 | int r; | |
2740 | cnt = ret; | |
2741 | r = ring_buffer_resize(global_trace.buffer, | |
2742 | global_trace.entries); | |
2743 | if (r < 0) { | |
2744 | /* AARGH! We are left with different | |
2745 | * size max buffer!!!! */ | |
2746 | WARN_ON(1); | |
2747 | tracing_disabled = 1; | |
a98a3c3f | 2748 | } |
3928a8a2 | 2749 | goto out; |
a98a3c3f | 2750 | } |
3eefae99 | 2751 | |
3928a8a2 | 2752 | global_trace.entries = val; |
a98a3c3f SR |
2753 | } |
2754 | ||
2755 | filp->f_pos += cnt; | |
2756 | ||
19384c03 SR |
2757 | /* If check pages failed, return ENOMEM */ |
2758 | if (tracing_disabled) | |
2759 | cnt = -ENOMEM; | |
a98a3c3f | 2760 | out: |
bf5e6519 SR |
2761 | for_each_tracing_cpu(cpu) { |
2762 | if (global_trace.data[cpu]) | |
2763 | atomic_dec(&global_trace.data[cpu]->disabled); | |
2764 | if (max_tr.data[cpu]) | |
2765 | atomic_dec(&max_tr.data[cpu]->disabled); | |
2766 | } | |
2767 | ||
c76f0694 | 2768 | tracing_start(); |
a98a3c3f SR |
2769 | max_tr.entries = global_trace.entries; |
2770 | mutex_unlock(&trace_types_lock); | |
2771 | ||
2772 | return cnt; | |
2773 | } | |
2774 | ||
5bf9a1ee PP |
2775 | static int mark_printk(const char *fmt, ...) |
2776 | { | |
2777 | int ret; | |
2778 | va_list args; | |
2779 | va_start(args, fmt); | |
1fd8f2a3 | 2780 | ret = trace_vprintk(0, -1, fmt, args); |
5bf9a1ee PP |
2781 | va_end(args); |
2782 | return ret; | |
2783 | } | |
2784 | ||
2785 | static ssize_t | |
2786 | tracing_mark_write(struct file *filp, const char __user *ubuf, | |
2787 | size_t cnt, loff_t *fpos) | |
2788 | { | |
2789 | char *buf; | |
2790 | char *end; | |
5bf9a1ee | 2791 | |
c76f0694 | 2792 | if (tracing_disabled) |
5bf9a1ee PP |
2793 | return -EINVAL; |
2794 | ||
2795 | if (cnt > TRACE_BUF_SIZE) | |
2796 | cnt = TRACE_BUF_SIZE; | |
2797 | ||
2798 | buf = kmalloc(cnt + 1, GFP_KERNEL); | |
2799 | if (buf == NULL) | |
2800 | return -ENOMEM; | |
2801 | ||
2802 | if (copy_from_user(buf, ubuf, cnt)) { | |
2803 | kfree(buf); | |
2804 | return -EFAULT; | |
2805 | } | |
2806 | ||
2807 | /* Cut from the first nil or newline. */ | |
2808 | buf[cnt] = '\0'; | |
2809 | end = strchr(buf, '\n'); | |
2810 | if (end) | |
2811 | *end = '\0'; | |
2812 | ||
2813 | cnt = mark_printk("%s\n", buf); | |
2814 | kfree(buf); | |
2815 | *fpos += cnt; | |
2816 | ||
2817 | return cnt; | |
2818 | } | |
2819 | ||
bc0c38d1 | 2820 | static struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
2821 | .open = tracing_open_generic, |
2822 | .read = tracing_max_lat_read, | |
2823 | .write = tracing_max_lat_write, | |
bc0c38d1 SR |
2824 | }; |
2825 | ||
2826 | static struct file_operations tracing_ctrl_fops = { | |
4bf39a94 IM |
2827 | .open = tracing_open_generic, |
2828 | .read = tracing_ctrl_read, | |
2829 | .write = tracing_ctrl_write, | |
bc0c38d1 SR |
2830 | }; |
2831 | ||
2832 | static struct file_operations set_tracer_fops = { | |
4bf39a94 IM |
2833 | .open = tracing_open_generic, |
2834 | .read = tracing_set_trace_read, | |
2835 | .write = tracing_set_trace_write, | |
bc0c38d1 SR |
2836 | }; |
2837 | ||
b3806b43 | 2838 | static struct file_operations tracing_pipe_fops = { |
4bf39a94 | 2839 | .open = tracing_open_pipe, |
2a2cc8f7 | 2840 | .poll = tracing_poll_pipe, |
4bf39a94 | 2841 | .read = tracing_read_pipe, |
3c56819b | 2842 | .splice_read = tracing_splice_read_pipe, |
4bf39a94 | 2843 | .release = tracing_release_pipe, |
b3806b43 SR |
2844 | }; |
2845 | ||
a98a3c3f SR |
2846 | static struct file_operations tracing_entries_fops = { |
2847 | .open = tracing_open_generic, | |
2848 | .read = tracing_entries_read, | |
2849 | .write = tracing_entries_write, | |
2850 | }; | |
2851 | ||
5bf9a1ee | 2852 | static struct file_operations tracing_mark_fops = { |
43a15386 | 2853 | .open = tracing_open_generic, |
5bf9a1ee PP |
2854 | .write = tracing_mark_write, |
2855 | }; | |
2856 | ||
bc0c38d1 SR |
2857 | #ifdef CONFIG_DYNAMIC_FTRACE |
2858 | ||
b807c3d0 SR |
2859 | int __weak ftrace_arch_read_dyn_info(char *buf, int size) |
2860 | { | |
2861 | return 0; | |
2862 | } | |
2863 | ||
bc0c38d1 | 2864 | static ssize_t |
b807c3d0 | 2865 | tracing_read_dyn_info(struct file *filp, char __user *ubuf, |
bc0c38d1 SR |
2866 | size_t cnt, loff_t *ppos) |
2867 | { | |
a26a2a27 SR |
2868 | static char ftrace_dyn_info_buffer[1024]; |
2869 | static DEFINE_MUTEX(dyn_info_mutex); | |
bc0c38d1 | 2870 | unsigned long *p = filp->private_data; |
b807c3d0 | 2871 | char *buf = ftrace_dyn_info_buffer; |
a26a2a27 | 2872 | int size = ARRAY_SIZE(ftrace_dyn_info_buffer); |
bc0c38d1 SR |
2873 | int r; |
2874 | ||
b807c3d0 SR |
2875 | mutex_lock(&dyn_info_mutex); |
2876 | r = sprintf(buf, "%ld ", *p); | |
4bf39a94 | 2877 | |
a26a2a27 | 2878 | r += ftrace_arch_read_dyn_info(buf+r, (size-1)-r); |
b807c3d0 SR |
2879 | buf[r++] = '\n'; |
2880 | ||
2881 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
2882 | ||
2883 | mutex_unlock(&dyn_info_mutex); | |
2884 | ||
2885 | return r; | |
bc0c38d1 SR |
2886 | } |
2887 | ||
b807c3d0 | 2888 | static struct file_operations tracing_dyn_info_fops = { |
4bf39a94 | 2889 | .open = tracing_open_generic, |
b807c3d0 | 2890 | .read = tracing_read_dyn_info, |
bc0c38d1 SR |
2891 | }; |
2892 | #endif | |
2893 | ||
2894 | static struct dentry *d_tracer; | |
2895 | ||
2896 | struct dentry *tracing_init_dentry(void) | |
2897 | { | |
2898 | static int once; | |
2899 | ||
2900 | if (d_tracer) | |
2901 | return d_tracer; | |
2902 | ||
2903 | d_tracer = debugfs_create_dir("tracing", NULL); | |
2904 | ||
2905 | if (!d_tracer && !once) { | |
2906 | once = 1; | |
2907 | pr_warning("Could not create debugfs directory 'tracing'\n"); | |
2908 | return NULL; | |
2909 | } | |
2910 | ||
2911 | return d_tracer; | |
2912 | } | |
2913 | ||
60a11774 SR |
2914 | #ifdef CONFIG_FTRACE_SELFTEST |
2915 | /* Let selftest have access to static functions in this file */ | |
2916 | #include "trace_selftest.c" | |
2917 | #endif | |
2918 | ||
b5ad384e | 2919 | static __init int tracer_init_debugfs(void) |
bc0c38d1 SR |
2920 | { |
2921 | struct dentry *d_tracer; | |
2922 | struct dentry *entry; | |
2923 | ||
2924 | d_tracer = tracing_init_dentry(); | |
2925 | ||
2926 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, | |
2927 | &global_trace, &tracing_ctrl_fops); | |
2928 | if (!entry) | |
2929 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); | |
2930 | ||
ee6bce52 | 2931 | entry = debugfs_create_file("trace_options", 0644, d_tracer, |
bc0c38d1 SR |
2932 | NULL, &tracing_iter_fops); |
2933 | if (!entry) | |
ee6bce52 | 2934 | pr_warning("Could not create debugfs 'trace_options' entry\n"); |
bc0c38d1 | 2935 | |
c7078de1 IM |
2936 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
2937 | NULL, &tracing_cpumask_fops); | |
2938 | if (!entry) | |
2939 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); | |
2940 | ||
bc0c38d1 SR |
2941 | entry = debugfs_create_file("trace", 0444, d_tracer, |
2942 | &global_trace, &tracing_fops); | |
2943 | if (!entry) | |
2944 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2945 | ||
2946 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, | |
2947 | &global_trace, &show_traces_fops); | |
2948 | if (!entry) | |
98a983aa | 2949 | pr_warning("Could not create debugfs 'available_tracers' entry\n"); |
bc0c38d1 SR |
2950 | |
2951 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, | |
2952 | &global_trace, &set_tracer_fops); | |
2953 | if (!entry) | |
98a983aa | 2954 | pr_warning("Could not create debugfs 'current_tracer' entry\n"); |
bc0c38d1 SR |
2955 | |
2956 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, | |
2957 | &tracing_max_latency, | |
2958 | &tracing_max_lat_fops); | |
2959 | if (!entry) | |
2960 | pr_warning("Could not create debugfs " | |
2961 | "'tracing_max_latency' entry\n"); | |
2962 | ||
2963 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, | |
2964 | &tracing_thresh, &tracing_max_lat_fops); | |
2965 | if (!entry) | |
2966 | pr_warning("Could not create debugfs " | |
98a983aa | 2967 | "'tracing_thresh' entry\n"); |
7bd2f24c IM |
2968 | entry = debugfs_create_file("README", 0644, d_tracer, |
2969 | NULL, &tracing_readme_fops); | |
2970 | if (!entry) | |
2971 | pr_warning("Could not create debugfs 'README' entry\n"); | |
2972 | ||
b3806b43 SR |
2973 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
2974 | NULL, &tracing_pipe_fops); | |
2975 | if (!entry) | |
2976 | pr_warning("Could not create debugfs " | |
98a983aa | 2977 | "'trace_pipe' entry\n"); |
bc0c38d1 | 2978 | |
a94c80e7 | 2979 | entry = debugfs_create_file("buffer_size_kb", 0644, d_tracer, |
a98a3c3f SR |
2980 | &global_trace, &tracing_entries_fops); |
2981 | if (!entry) | |
2982 | pr_warning("Could not create debugfs " | |
a94c80e7 | 2983 | "'buffer_size_kb' entry\n"); |
a98a3c3f | 2984 | |
5bf9a1ee PP |
2985 | entry = debugfs_create_file("trace_marker", 0220, d_tracer, |
2986 | NULL, &tracing_mark_fops); | |
2987 | if (!entry) | |
2988 | pr_warning("Could not create debugfs " | |
2989 | "'trace_marker' entry\n"); | |
2990 | ||
bc0c38d1 SR |
2991 | #ifdef CONFIG_DYNAMIC_FTRACE |
2992 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, | |
2993 | &ftrace_update_tot_cnt, | |
b807c3d0 | 2994 | &tracing_dyn_info_fops); |
bc0c38d1 SR |
2995 | if (!entry) |
2996 | pr_warning("Could not create debugfs " | |
2997 | "'dyn_ftrace_total_info' entry\n"); | |
2998 | #endif | |
d618b3e6 IM |
2999 | #ifdef CONFIG_SYSPROF_TRACER |
3000 | init_tracer_sysprof_debugfs(d_tracer); | |
3001 | #endif | |
b5ad384e | 3002 | return 0; |
bc0c38d1 SR |
3003 | } |
3004 | ||
1fd8f2a3 | 3005 | int trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args) |
dd0e545f | 3006 | { |
dd0e545f SR |
3007 | static DEFINE_SPINLOCK(trace_buf_lock); |
3008 | static char trace_buf[TRACE_BUF_SIZE]; | |
f09ce573 | 3009 | |
3928a8a2 | 3010 | struct ring_buffer_event *event; |
f09ce573 | 3011 | struct trace_array *tr = &global_trace; |
dd0e545f | 3012 | struct trace_array_cpu *data; |
38697053 | 3013 | int cpu, len = 0, size, pc; |
e726f5f9 IM |
3014 | struct print_entry *entry; |
3015 | unsigned long irq_flags; | |
dd0e545f | 3016 | |
8e1b82e0 | 3017 | if (tracing_disabled || tracing_selftest_running) |
dd0e545f SR |
3018 | return 0; |
3019 | ||
38697053 SR |
3020 | pc = preempt_count(); |
3021 | preempt_disable_notrace(); | |
dd0e545f SR |
3022 | cpu = raw_smp_processor_id(); |
3023 | data = tr->data[cpu]; | |
dd0e545f | 3024 | |
3ea2e6d7 | 3025 | if (unlikely(atomic_read(&data->disabled))) |
dd0e545f SR |
3026 | goto out; |
3027 | ||
380c4b14 FW |
3028 | pause_graph_tracing(); |
3029 | spin_lock_irqsave(&trace_buf_lock, irq_flags); | |
801fe400 | 3030 | len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args); |
dd0e545f SR |
3031 | |
3032 | len = min(len, TRACE_BUF_SIZE-1); | |
3033 | trace_buf[len] = 0; | |
3034 | ||
777e208d | 3035 | size = sizeof(*entry) + len + 1; |
51a763dd | 3036 | event = trace_buffer_lock_reserve(tr, TRACE_PRINT, size, irq_flags, pc); |
3928a8a2 SR |
3037 | if (!event) |
3038 | goto out_unlock; | |
777e208d | 3039 | entry = ring_buffer_event_data(event); |
777e208d | 3040 | entry->ip = ip; |
1fd8f2a3 | 3041 | entry->depth = depth; |
dd0e545f | 3042 | |
777e208d SR |
3043 | memcpy(&entry->buf, trace_buf, len); |
3044 | entry->buf[len] = 0; | |
0a987751 | 3045 | ring_buffer_unlock_commit(tr->buffer, event); |
dd0e545f | 3046 | |
3928a8a2 | 3047 | out_unlock: |
380c4b14 FW |
3048 | spin_unlock_irqrestore(&trace_buf_lock, irq_flags); |
3049 | unpause_graph_tracing(); | |
dd0e545f | 3050 | out: |
38697053 | 3051 | preempt_enable_notrace(); |
dd0e545f SR |
3052 | |
3053 | return len; | |
3054 | } | |
801fe400 PP |
3055 | EXPORT_SYMBOL_GPL(trace_vprintk); |
3056 | ||
3057 | int __ftrace_printk(unsigned long ip, const char *fmt, ...) | |
3058 | { | |
3059 | int ret; | |
3060 | va_list ap; | |
3061 | ||
3062 | if (!(trace_flags & TRACE_ITER_PRINTK)) | |
3063 | return 0; | |
3064 | ||
3065 | va_start(ap, fmt); | |
21a8c466 | 3066 | ret = trace_vprintk(ip, task_curr_ret_stack(current), fmt, ap); |
801fe400 PP |
3067 | va_end(ap); |
3068 | return ret; | |
3069 | } | |
dd0e545f SR |
3070 | EXPORT_SYMBOL_GPL(__ftrace_printk); |
3071 | ||
9011262a ACM |
3072 | int __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap) |
3073 | { | |
3074 | if (!(trace_flags & TRACE_ITER_PRINTK)) | |
3075 | return 0; | |
3076 | ||
3077 | return trace_vprintk(ip, task_curr_ret_stack(current), fmt, ap); | |
3078 | } | |
3079 | EXPORT_SYMBOL_GPL(__ftrace_vprintk); | |
3080 | ||
3f5a54e3 SR |
3081 | static int trace_panic_handler(struct notifier_block *this, |
3082 | unsigned long event, void *unused) | |
3083 | { | |
944ac425 SR |
3084 | if (ftrace_dump_on_oops) |
3085 | ftrace_dump(); | |
3f5a54e3 SR |
3086 | return NOTIFY_OK; |
3087 | } | |
3088 | ||
3089 | static struct notifier_block trace_panic_notifier = { | |
3090 | .notifier_call = trace_panic_handler, | |
3091 | .next = NULL, | |
3092 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ | |
3093 | }; | |
3094 | ||
3095 | static int trace_die_handler(struct notifier_block *self, | |
3096 | unsigned long val, | |
3097 | void *data) | |
3098 | { | |
3099 | switch (val) { | |
3100 | case DIE_OOPS: | |
944ac425 SR |
3101 | if (ftrace_dump_on_oops) |
3102 | ftrace_dump(); | |
3f5a54e3 SR |
3103 | break; |
3104 | default: | |
3105 | break; | |
3106 | } | |
3107 | return NOTIFY_OK; | |
3108 | } | |
3109 | ||
3110 | static struct notifier_block trace_die_notifier = { | |
3111 | .notifier_call = trace_die_handler, | |
3112 | .priority = 200 | |
3113 | }; | |
3114 | ||
3115 | /* | |
3116 | * printk is set to max of 1024, we really don't need it that big. | |
3117 | * Nothing should be printing 1000 characters anyway. | |
3118 | */ | |
3119 | #define TRACE_MAX_PRINT 1000 | |
3120 | ||
3121 | /* | |
3122 | * Define here KERN_TRACE so that we have one place to modify | |
3123 | * it if we decide to change what log level the ftrace dump | |
3124 | * should be at. | |
3125 | */ | |
428aee14 | 3126 | #define KERN_TRACE KERN_EMERG |
3f5a54e3 SR |
3127 | |
3128 | static void | |
3129 | trace_printk_seq(struct trace_seq *s) | |
3130 | { | |
3131 | /* Probably should print a warning here. */ | |
3132 | if (s->len >= 1000) | |
3133 | s->len = 1000; | |
3134 | ||
3135 | /* should be zero ended, but we are paranoid. */ | |
3136 | s->buffer[s->len] = 0; | |
3137 | ||
3138 | printk(KERN_TRACE "%s", s->buffer); | |
3139 | ||
3140 | trace_seq_reset(s); | |
3141 | } | |
3142 | ||
3f5a54e3 SR |
3143 | void ftrace_dump(void) |
3144 | { | |
3145 | static DEFINE_SPINLOCK(ftrace_dump_lock); | |
3146 | /* use static because iter can be a bit big for the stack */ | |
3147 | static struct trace_iterator iter; | |
3f5a54e3 | 3148 | static int dump_ran; |
d769041f SR |
3149 | unsigned long flags; |
3150 | int cnt = 0, cpu; | |
3f5a54e3 SR |
3151 | |
3152 | /* only one dump */ | |
3153 | spin_lock_irqsave(&ftrace_dump_lock, flags); | |
3154 | if (dump_ran) | |
3155 | goto out; | |
3156 | ||
3157 | dump_ran = 1; | |
3158 | ||
3159 | /* No turning back! */ | |
0ee6b6cf | 3160 | tracing_off(); |
81adbdc0 | 3161 | ftrace_kill(); |
3f5a54e3 | 3162 | |
d769041f SR |
3163 | for_each_tracing_cpu(cpu) { |
3164 | atomic_inc(&global_trace.data[cpu]->disabled); | |
3165 | } | |
3166 | ||
b54d3de9 TE |
3167 | /* don't look at user memory in panic mode */ |
3168 | trace_flags &= ~TRACE_ITER_SYM_USEROBJ; | |
3169 | ||
3f5a54e3 SR |
3170 | printk(KERN_TRACE "Dumping ftrace buffer:\n"); |
3171 | ||
3172 | iter.tr = &global_trace; | |
3173 | iter.trace = current_trace; | |
3174 | ||
3175 | /* | |
3176 | * We need to stop all tracing on all CPUS to read the | |
3177 | * the next buffer. This is a bit expensive, but is | |
3178 | * not done often. We fill all what we can read, | |
3179 | * and then release the locks again. | |
3180 | */ | |
3181 | ||
3f5a54e3 SR |
3182 | while (!trace_empty(&iter)) { |
3183 | ||
3184 | if (!cnt) | |
3185 | printk(KERN_TRACE "---------------------------------\n"); | |
3186 | ||
3187 | cnt++; | |
3188 | ||
3189 | /* reset all but tr, trace, and overruns */ | |
3190 | memset(&iter.seq, 0, | |
3191 | sizeof(struct trace_iterator) - | |
3192 | offsetof(struct trace_iterator, seq)); | |
3193 | iter.iter_flags |= TRACE_FILE_LAT_FMT; | |
3194 | iter.pos = -1; | |
3195 | ||
3196 | if (find_next_entry_inc(&iter) != NULL) { | |
3197 | print_trace_line(&iter); | |
3198 | trace_consume(&iter); | |
3199 | } | |
3200 | ||
3201 | trace_printk_seq(&iter.seq); | |
3202 | } | |
3203 | ||
3204 | if (!cnt) | |
3205 | printk(KERN_TRACE " (ftrace buffer empty)\n"); | |
3206 | else | |
3207 | printk(KERN_TRACE "---------------------------------\n"); | |
3208 | ||
3f5a54e3 SR |
3209 | out: |
3210 | spin_unlock_irqrestore(&ftrace_dump_lock, flags); | |
3211 | } | |
3212 | ||
3928a8a2 | 3213 | __init static int tracer_alloc_buffers(void) |
bc0c38d1 | 3214 | { |
4c11d7ae | 3215 | struct trace_array_cpu *data; |
4c11d7ae | 3216 | int i; |
9e01c1b7 | 3217 | int ret = -ENOMEM; |
4c11d7ae | 3218 | |
9e01c1b7 RR |
3219 | if (!alloc_cpumask_var(&tracing_buffer_mask, GFP_KERNEL)) |
3220 | goto out; | |
3221 | ||
3222 | if (!alloc_cpumask_var(&tracing_cpumask, GFP_KERNEL)) | |
3223 | goto out_free_buffer_mask; | |
4c11d7ae | 3224 | |
9e01c1b7 RR |
3225 | cpumask_copy(tracing_buffer_mask, cpu_possible_mask); |
3226 | cpumask_copy(tracing_cpumask, cpu_all_mask); | |
3227 | ||
3228 | /* TODO: make the number of buffers hot pluggable with CPUS */ | |
3928a8a2 SR |
3229 | global_trace.buffer = ring_buffer_alloc(trace_buf_size, |
3230 | TRACE_BUFFER_FLAGS); | |
3231 | if (!global_trace.buffer) { | |
3232 | printk(KERN_ERR "tracer: failed to allocate ring buffer!\n"); | |
3233 | WARN_ON(1); | |
9e01c1b7 | 3234 | goto out_free_cpumask; |
4c11d7ae | 3235 | } |
3928a8a2 | 3236 | global_trace.entries = ring_buffer_size(global_trace.buffer); |
4c11d7ae | 3237 | |
9e01c1b7 | 3238 | |
4c11d7ae | 3239 | #ifdef CONFIG_TRACER_MAX_TRACE |
3928a8a2 SR |
3240 | max_tr.buffer = ring_buffer_alloc(trace_buf_size, |
3241 | TRACE_BUFFER_FLAGS); | |
3242 | if (!max_tr.buffer) { | |
3243 | printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n"); | |
3244 | WARN_ON(1); | |
3245 | ring_buffer_free(global_trace.buffer); | |
9e01c1b7 | 3246 | goto out_free_cpumask; |
4c11d7ae | 3247 | } |
3928a8a2 SR |
3248 | max_tr.entries = ring_buffer_size(max_tr.buffer); |
3249 | WARN_ON(max_tr.entries != global_trace.entries); | |
a98a3c3f | 3250 | #endif |
ab46428c | 3251 | |
4c11d7ae | 3252 | /* Allocate the first page for all buffers */ |
ab46428c | 3253 | for_each_tracing_cpu(i) { |
4c11d7ae | 3254 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
bc0c38d1 | 3255 | max_tr.data[i] = &per_cpu(max_data, i); |
4c11d7ae | 3256 | } |
bc0c38d1 | 3257 | |
bc0c38d1 SR |
3258 | trace_init_cmdlines(); |
3259 | ||
43a15386 | 3260 | register_tracer(&nop_trace); |
79fb0768 | 3261 | current_trace = &nop_trace; |
b5ad384e FW |
3262 | #ifdef CONFIG_BOOT_TRACER |
3263 | register_tracer(&boot_tracer); | |
b5ad384e | 3264 | #endif |
60a11774 SR |
3265 | /* All seems OK, enable tracing */ |
3266 | tracing_disabled = 0; | |
3928a8a2 | 3267 | |
3f5a54e3 SR |
3268 | atomic_notifier_chain_register(&panic_notifier_list, |
3269 | &trace_panic_notifier); | |
3270 | ||
3271 | register_die_notifier(&trace_die_notifier); | |
9e01c1b7 | 3272 | ret = 0; |
3f5a54e3 | 3273 | |
9e01c1b7 RR |
3274 | out_free_cpumask: |
3275 | free_cpumask_var(tracing_cpumask); | |
3276 | out_free_buffer_mask: | |
3277 | free_cpumask_var(tracing_buffer_mask); | |
3278 | out: | |
3279 | return ret; | |
bc0c38d1 | 3280 | } |
b2821ae6 SR |
3281 | |
3282 | __init static int clear_boot_tracer(void) | |
3283 | { | |
3284 | /* | |
3285 | * The default tracer at boot buffer is an init section. | |
3286 | * This function is called in lateinit. If we did not | |
3287 | * find the boot tracer, then clear it out, to prevent | |
3288 | * later registration from accessing the buffer that is | |
3289 | * about to be freed. | |
3290 | */ | |
3291 | if (!default_bootup_tracer) | |
3292 | return 0; | |
3293 | ||
3294 | printk(KERN_INFO "ftrace bootup tracer '%s' not registered.\n", | |
3295 | default_bootup_tracer); | |
3296 | default_bootup_tracer = NULL; | |
3297 | ||
3298 | return 0; | |
3299 | } | |
3300 | ||
b5ad384e FW |
3301 | early_initcall(tracer_alloc_buffers); |
3302 | fs_initcall(tracer_init_debugfs); | |
b2821ae6 | 3303 | late_initcall(clear_boot_tracer); |