]>
Commit | Line | Data |
---|---|---|
bcea3f96 | 1 | // SPDX-License-Identifier: GPL-2.0 |
bc0c38d1 SR |
2 | /* |
3 | * ring buffer based function tracer | |
4 | * | |
2b6080f2 | 5 | * Copyright (C) 2007-2012 Steven Rostedt <srostedt@redhat.com> |
bc0c38d1 SR |
6 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> |
7 | * | |
8 | * Originally taken from the RT patch by: | |
9 | * Arnaldo Carvalho de Melo <acme@redhat.com> | |
10 | * | |
11 | * Based on code from the latency_tracer, that is: | |
12 | * Copyright (C) 2004-2006 Ingo Molnar | |
6d49e352 | 13 | * Copyright (C) 2004 Nadia Yvette Chambers |
bc0c38d1 | 14 | */ |
2cadf913 | 15 | #include <linux/ring_buffer.h> |
273b281f | 16 | #include <generated/utsrelease.h> |
2cadf913 SR |
17 | #include <linux/stacktrace.h> |
18 | #include <linux/writeback.h> | |
bc0c38d1 | 19 | #include <linux/kallsyms.h> |
17911ff3 | 20 | #include <linux/security.h> |
bc0c38d1 | 21 | #include <linux/seq_file.h> |
3f5a54e3 | 22 | #include <linux/notifier.h> |
2cadf913 | 23 | #include <linux/irqflags.h> |
bc0c38d1 | 24 | #include <linux/debugfs.h> |
8434dc93 | 25 | #include <linux/tracefs.h> |
4c11d7ae | 26 | #include <linux/pagemap.h> |
bc0c38d1 SR |
27 | #include <linux/hardirq.h> |
28 | #include <linux/linkage.h> | |
29 | #include <linux/uaccess.h> | |
76c813e2 | 30 | #include <linux/vmalloc.h> |
bc0c38d1 SR |
31 | #include <linux/ftrace.h> |
32 | #include <linux/module.h> | |
33 | #include <linux/percpu.h> | |
2cadf913 | 34 | #include <linux/splice.h> |
3f5a54e3 | 35 | #include <linux/kdebug.h> |
5f0c6c03 | 36 | #include <linux/string.h> |
f76180bc | 37 | #include <linux/mount.h> |
7e53bd42 | 38 | #include <linux/rwsem.h> |
5a0e3ad6 | 39 | #include <linux/slab.h> |
bc0c38d1 SR |
40 | #include <linux/ctype.h> |
41 | #include <linux/init.h> | |
2a2cc8f7 | 42 | #include <linux/poll.h> |
b892e5c8 | 43 | #include <linux/nmi.h> |
bc0c38d1 | 44 | #include <linux/fs.h> |
478409dd | 45 | #include <linux/trace.h> |
3fd49c9e | 46 | #include <linux/sched/clock.h> |
8bd75c77 | 47 | #include <linux/sched/rt.h> |
91edde2e VRB |
48 | #include <linux/fsnotify.h> |
49 | #include <linux/irq_work.h> | |
50 | #include <linux/workqueue.h> | |
86387f7e | 51 | |
bc0c38d1 | 52 | #include "trace.h" |
f0868d1e | 53 | #include "trace_output.h" |
bc0c38d1 | 54 | |
73c5162a SR |
55 | /* |
56 | * On boot up, the ring buffer is set to the minimum size, so that | |
57 | * we do not waste memory on systems that are not using tracing. | |
58 | */ | |
55034cd6 | 59 | bool ring_buffer_expanded; |
73c5162a | 60 | |
8e1b82e0 FW |
61 | /* |
62 | * We need to change this state when a selftest is running. | |
ff32504f FW |
63 | * A selftest will lurk into the ring-buffer to count the |
64 | * entries inserted during the selftest although some concurrent | |
5e1607a0 | 65 | * insertions into the ring-buffer such as trace_printk could occurred |
ff32504f FW |
66 | * at the same time, giving false positive or negative results. |
67 | */ | |
8e1b82e0 | 68 | static bool __read_mostly tracing_selftest_running; |
ff32504f | 69 | |
b2821ae6 SR |
70 | /* |
71 | * If a tracer is running, we do not want to run SELFTEST. | |
72 | */ | |
020e5f85 | 73 | bool __read_mostly tracing_selftest_disabled; |
b2821ae6 | 74 | |
0daa2302 SRRH |
75 | /* Pipe tracepoints to printk */ |
76 | struct trace_iterator *tracepoint_print_iter; | |
77 | int tracepoint_printk; | |
42391745 | 78 | static DEFINE_STATIC_KEY_FALSE(tracepoint_printk_key); |
0daa2302 | 79 | |
adf9f195 FW |
80 | /* For tracers that don't implement custom flags */ |
81 | static struct tracer_opt dummy_tracer_opt[] = { | |
82 | { } | |
83 | }; | |
84 | ||
8c1a49ae SRRH |
85 | static int |
86 | dummy_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set) | |
adf9f195 FW |
87 | { |
88 | return 0; | |
89 | } | |
0f048701 | 90 | |
7ffbd48d SR |
91 | /* |
92 | * To prevent the comm cache from being overwritten when no | |
93 | * tracing is active, only save the comm when a trace event | |
94 | * occurred. | |
95 | */ | |
d914ba37 | 96 | static DEFINE_PER_CPU(bool, trace_taskinfo_save); |
7ffbd48d | 97 | |
0f048701 SR |
98 | /* |
99 | * Kill all tracing for good (never come back). | |
100 | * It is initialized to 1 but will turn to zero if the initialization | |
101 | * of the tracer is successful. But that is the only place that sets | |
102 | * this back to zero. | |
103 | */ | |
4fd27358 | 104 | static int tracing_disabled = 1; |
0f048701 | 105 | |
955b61e5 | 106 | cpumask_var_t __read_mostly tracing_buffer_mask; |
ab46428c | 107 | |
944ac425 SR |
108 | /* |
109 | * ftrace_dump_on_oops - variable to dump ftrace buffer on oops | |
110 | * | |
111 | * If there is an oops (or kernel panic) and the ftrace_dump_on_oops | |
112 | * is set, then ftrace_dump is called. This will output the contents | |
113 | * of the ftrace buffers to the console. This is very useful for | |
114 | * capturing traces that lead to crashes and outputing it to a | |
115 | * serial console. | |
116 | * | |
117 | * It is default off, but you can enable it with either specifying | |
118 | * "ftrace_dump_on_oops" in the kernel command line, or setting | |
cecbca96 FW |
119 | * /proc/sys/kernel/ftrace_dump_on_oops |
120 | * Set 1 if you want to dump buffers of all CPUs | |
121 | * Set 2 if you want to dump the buffer of the CPU that triggered oops | |
944ac425 | 122 | */ |
cecbca96 FW |
123 | |
124 | enum ftrace_dump_mode ftrace_dump_on_oops; | |
944ac425 | 125 | |
de7edd31 SRRH |
126 | /* When set, tracing will stop when a WARN*() is hit */ |
127 | int __disable_trace_on_warning; | |
128 | ||
681bec03 JL |
129 | #ifdef CONFIG_TRACE_EVAL_MAP_FILE |
130 | /* Map of enums to their values, for "eval_map" file */ | |
23bf8cb8 | 131 | struct trace_eval_map_head { |
9828413d SRRH |
132 | struct module *mod; |
133 | unsigned long length; | |
134 | }; | |
135 | ||
23bf8cb8 | 136 | union trace_eval_map_item; |
9828413d | 137 | |
23bf8cb8 | 138 | struct trace_eval_map_tail { |
9828413d SRRH |
139 | /* |
140 | * "end" is first and points to NULL as it must be different | |
00f4b652 | 141 | * than "mod" or "eval_string" |
9828413d | 142 | */ |
23bf8cb8 | 143 | union trace_eval_map_item *next; |
9828413d SRRH |
144 | const char *end; /* points to NULL */ |
145 | }; | |
146 | ||
1793ed93 | 147 | static DEFINE_MUTEX(trace_eval_mutex); |
9828413d SRRH |
148 | |
149 | /* | |
23bf8cb8 | 150 | * The trace_eval_maps are saved in an array with two extra elements, |
9828413d SRRH |
151 | * one at the beginning, and one at the end. The beginning item contains |
152 | * the count of the saved maps (head.length), and the module they | |
153 | * belong to if not built in (head.mod). The ending item contains a | |
681bec03 | 154 | * pointer to the next array of saved eval_map items. |
9828413d | 155 | */ |
23bf8cb8 | 156 | union trace_eval_map_item { |
00f4b652 | 157 | struct trace_eval_map map; |
23bf8cb8 JL |
158 | struct trace_eval_map_head head; |
159 | struct trace_eval_map_tail tail; | |
9828413d SRRH |
160 | }; |
161 | ||
23bf8cb8 | 162 | static union trace_eval_map_item *trace_eval_maps; |
681bec03 | 163 | #endif /* CONFIG_TRACE_EVAL_MAP_FILE */ |
9828413d | 164 | |
9c5b9d3d | 165 | int tracing_set_tracer(struct trace_array *tr, const char *buf); |
13292494 | 166 | static void ftrace_trace_userstack(struct trace_buffer *buffer, |
c438f140 | 167 | unsigned long flags, int pc); |
b2821ae6 | 168 | |
ee6c2c1b LZ |
169 | #define MAX_TRACER_SIZE 100 |
170 | static char bootup_tracer_buf[MAX_TRACER_SIZE] __initdata; | |
b2821ae6 | 171 | static char *default_bootup_tracer; |
d9e54076 | 172 | |
55034cd6 SRRH |
173 | static bool allocate_snapshot; |
174 | ||
1beee96b | 175 | static int __init set_cmdline_ftrace(char *str) |
d9e54076 | 176 | { |
67012ab1 | 177 | strlcpy(bootup_tracer_buf, str, MAX_TRACER_SIZE); |
b2821ae6 | 178 | default_bootup_tracer = bootup_tracer_buf; |
73c5162a | 179 | /* We are using ftrace early, expand it */ |
55034cd6 | 180 | ring_buffer_expanded = true; |
d9e54076 PZ |
181 | return 1; |
182 | } | |
1beee96b | 183 | __setup("ftrace=", set_cmdline_ftrace); |
d9e54076 | 184 | |
944ac425 SR |
185 | static int __init set_ftrace_dump_on_oops(char *str) |
186 | { | |
cecbca96 FW |
187 | if (*str++ != '=' || !*str) { |
188 | ftrace_dump_on_oops = DUMP_ALL; | |
189 | return 1; | |
190 | } | |
191 | ||
192 | if (!strcmp("orig_cpu", str)) { | |
193 | ftrace_dump_on_oops = DUMP_ORIG; | |
194 | return 1; | |
195 | } | |
196 | ||
197 | return 0; | |
944ac425 SR |
198 | } |
199 | __setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops); | |
60a11774 | 200 | |
de7edd31 SRRH |
201 | static int __init stop_trace_on_warning(char *str) |
202 | { | |
933ff9f2 LCG |
203 | if ((strcmp(str, "=0") != 0 && strcmp(str, "=off") != 0)) |
204 | __disable_trace_on_warning = 1; | |
de7edd31 SRRH |
205 | return 1; |
206 | } | |
933ff9f2 | 207 | __setup("traceoff_on_warning", stop_trace_on_warning); |
de7edd31 | 208 | |
3209cff4 | 209 | static int __init boot_alloc_snapshot(char *str) |
55034cd6 SRRH |
210 | { |
211 | allocate_snapshot = true; | |
212 | /* We also need the main ring buffer expanded */ | |
213 | ring_buffer_expanded = true; | |
214 | return 1; | |
215 | } | |
3209cff4 | 216 | __setup("alloc_snapshot", boot_alloc_snapshot); |
55034cd6 | 217 | |
7bcfaf54 SR |
218 | |
219 | static char trace_boot_options_buf[MAX_TRACER_SIZE] __initdata; | |
7bcfaf54 SR |
220 | |
221 | static int __init set_trace_boot_options(char *str) | |
222 | { | |
67012ab1 | 223 | strlcpy(trace_boot_options_buf, str, MAX_TRACER_SIZE); |
7bcfaf54 SR |
224 | return 0; |
225 | } | |
226 | __setup("trace_options=", set_trace_boot_options); | |
227 | ||
e1e232ca SR |
228 | static char trace_boot_clock_buf[MAX_TRACER_SIZE] __initdata; |
229 | static char *trace_boot_clock __initdata; | |
230 | ||
231 | static int __init set_trace_boot_clock(char *str) | |
232 | { | |
233 | strlcpy(trace_boot_clock_buf, str, MAX_TRACER_SIZE); | |
234 | trace_boot_clock = trace_boot_clock_buf; | |
235 | return 0; | |
236 | } | |
237 | __setup("trace_clock=", set_trace_boot_clock); | |
238 | ||
0daa2302 SRRH |
239 | static int __init set_tracepoint_printk(char *str) |
240 | { | |
241 | if ((strcmp(str, "=0") != 0 && strcmp(str, "=off") != 0)) | |
242 | tracepoint_printk = 1; | |
243 | return 1; | |
244 | } | |
245 | __setup("tp_printk", set_tracepoint_printk); | |
de7edd31 | 246 | |
a5a1d1c2 | 247 | unsigned long long ns2usecs(u64 nsec) |
bc0c38d1 SR |
248 | { |
249 | nsec += 500; | |
250 | do_div(nsec, 1000); | |
251 | return nsec; | |
252 | } | |
253 | ||
8ab7a2b7 TZ |
254 | static void |
255 | trace_process_export(struct trace_export *export, | |
256 | struct ring_buffer_event *event, int flag) | |
257 | { | |
258 | struct trace_entry *entry; | |
259 | unsigned int size = 0; | |
260 | ||
261 | if (export->flags & flag) { | |
262 | entry = ring_buffer_event_data(event); | |
263 | size = ring_buffer_event_length(event); | |
264 | export->write(export, entry, size); | |
265 | } | |
266 | } | |
267 | ||
268 | static DEFINE_MUTEX(ftrace_export_lock); | |
269 | ||
270 | static struct trace_export __rcu *ftrace_exports_list __read_mostly; | |
271 | ||
272 | static DEFINE_STATIC_KEY_FALSE(trace_function_exports_enabled); | |
273 | static DEFINE_STATIC_KEY_FALSE(trace_event_exports_enabled); | |
458999c6 | 274 | static DEFINE_STATIC_KEY_FALSE(trace_marker_exports_enabled); |
8ab7a2b7 TZ |
275 | |
276 | static inline void ftrace_exports_enable(struct trace_export *export) | |
277 | { | |
278 | if (export->flags & TRACE_EXPORT_FUNCTION) | |
279 | static_branch_inc(&trace_function_exports_enabled); | |
280 | ||
281 | if (export->flags & TRACE_EXPORT_EVENT) | |
282 | static_branch_inc(&trace_event_exports_enabled); | |
458999c6 TZ |
283 | |
284 | if (export->flags & TRACE_EXPORT_MARKER) | |
285 | static_branch_inc(&trace_marker_exports_enabled); | |
8ab7a2b7 TZ |
286 | } |
287 | ||
288 | static inline void ftrace_exports_disable(struct trace_export *export) | |
289 | { | |
290 | if (export->flags & TRACE_EXPORT_FUNCTION) | |
291 | static_branch_dec(&trace_function_exports_enabled); | |
292 | ||
293 | if (export->flags & TRACE_EXPORT_EVENT) | |
294 | static_branch_dec(&trace_event_exports_enabled); | |
458999c6 TZ |
295 | |
296 | if (export->flags & TRACE_EXPORT_MARKER) | |
297 | static_branch_dec(&trace_marker_exports_enabled); | |
8ab7a2b7 TZ |
298 | } |
299 | ||
300 | static void ftrace_exports(struct ring_buffer_event *event, int flag) | |
301 | { | |
302 | struct trace_export *export; | |
303 | ||
304 | preempt_disable_notrace(); | |
305 | ||
306 | export = rcu_dereference_raw_check(ftrace_exports_list); | |
307 | while (export) { | |
308 | trace_process_export(export, event, flag); | |
309 | export = rcu_dereference_raw_check(export->next); | |
310 | } | |
311 | ||
312 | preempt_enable_notrace(); | |
313 | } | |
314 | ||
315 | static inline void | |
316 | add_trace_export(struct trace_export **list, struct trace_export *export) | |
317 | { | |
318 | rcu_assign_pointer(export->next, *list); | |
319 | /* | |
320 | * We are entering export into the list but another | |
321 | * CPU might be walking that list. We need to make sure | |
322 | * the export->next pointer is valid before another CPU sees | |
323 | * the export pointer included into the list. | |
324 | */ | |
325 | rcu_assign_pointer(*list, export); | |
326 | } | |
327 | ||
328 | static inline int | |
329 | rm_trace_export(struct trace_export **list, struct trace_export *export) | |
330 | { | |
331 | struct trace_export **p; | |
332 | ||
333 | for (p = list; *p != NULL; p = &(*p)->next) | |
334 | if (*p == export) | |
335 | break; | |
336 | ||
337 | if (*p != export) | |
338 | return -1; | |
339 | ||
340 | rcu_assign_pointer(*p, (*p)->next); | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
345 | static inline void | |
346 | add_ftrace_export(struct trace_export **list, struct trace_export *export) | |
347 | { | |
348 | ftrace_exports_enable(export); | |
349 | ||
350 | add_trace_export(list, export); | |
351 | } | |
352 | ||
353 | static inline int | |
354 | rm_ftrace_export(struct trace_export **list, struct trace_export *export) | |
355 | { | |
356 | int ret; | |
357 | ||
358 | ret = rm_trace_export(list, export); | |
359 | ftrace_exports_disable(export); | |
360 | ||
361 | return ret; | |
362 | } | |
363 | ||
364 | int register_ftrace_export(struct trace_export *export) | |
365 | { | |
366 | if (WARN_ON_ONCE(!export->write)) | |
367 | return -1; | |
368 | ||
369 | mutex_lock(&ftrace_export_lock); | |
370 | ||
371 | add_ftrace_export(&ftrace_exports_list, export); | |
372 | ||
373 | mutex_unlock(&ftrace_export_lock); | |
374 | ||
375 | return 0; | |
376 | } | |
377 | EXPORT_SYMBOL_GPL(register_ftrace_export); | |
378 | ||
379 | int unregister_ftrace_export(struct trace_export *export) | |
380 | { | |
381 | int ret; | |
382 | ||
383 | mutex_lock(&ftrace_export_lock); | |
384 | ||
385 | ret = rm_ftrace_export(&ftrace_exports_list, export); | |
386 | ||
387 | mutex_unlock(&ftrace_export_lock); | |
388 | ||
389 | return ret; | |
390 | } | |
391 | EXPORT_SYMBOL_GPL(unregister_ftrace_export); | |
392 | ||
983f938a SRRH |
393 | /* trace_flags holds trace_options default values */ |
394 | #define TRACE_DEFAULT_FLAGS \ | |
395 | (FUNCTION_DEFAULT_FLAGS | \ | |
396 | TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK | \ | |
397 | TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | \ | |
398 | TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE | \ | |
399 | TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS) | |
400 | ||
16270145 SRRH |
401 | /* trace_options that are only supported by global_trace */ |
402 | #define TOP_LEVEL_TRACE_FLAGS (TRACE_ITER_PRINTK | \ | |
403 | TRACE_ITER_PRINTK_MSGONLY | TRACE_ITER_RECORD_CMD) | |
404 | ||
20550622 SRRH |
405 | /* trace_flags that are default zero for instances */ |
406 | #define ZEROED_TRACE_FLAGS \ | |
1e10486f | 407 | (TRACE_ITER_EVENT_FORK | TRACE_ITER_FUNC_FORK) |
16270145 | 408 | |
4fcdae83 | 409 | /* |
67d04bb2 JF |
410 | * The global_trace is the descriptor that holds the top-level tracing |
411 | * buffers for the live tracing. | |
4fcdae83 | 412 | */ |
983f938a SRRH |
413 | static struct trace_array global_trace = { |
414 | .trace_flags = TRACE_DEFAULT_FLAGS, | |
415 | }; | |
bc0c38d1 | 416 | |
ae63b31e | 417 | LIST_HEAD(ftrace_trace_arrays); |
bc0c38d1 | 418 | |
ff451961 SRRH |
419 | int trace_array_get(struct trace_array *this_tr) |
420 | { | |
421 | struct trace_array *tr; | |
422 | int ret = -ENODEV; | |
423 | ||
424 | mutex_lock(&trace_types_lock); | |
425 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
426 | if (tr == this_tr) { | |
427 | tr->ref++; | |
428 | ret = 0; | |
429 | break; | |
430 | } | |
431 | } | |
432 | mutex_unlock(&trace_types_lock); | |
433 | ||
434 | return ret; | |
435 | } | |
436 | ||
437 | static void __trace_array_put(struct trace_array *this_tr) | |
438 | { | |
439 | WARN_ON(!this_tr->ref); | |
440 | this_tr->ref--; | |
441 | } | |
442 | ||
28879787 DI |
443 | /** |
444 | * trace_array_put - Decrement the reference counter for this trace array. | |
445 | * | |
446 | * NOTE: Use this when we no longer need the trace array returned by | |
447 | * trace_array_get_by_name(). This ensures the trace array can be later | |
448 | * destroyed. | |
449 | * | |
450 | */ | |
ff451961 SRRH |
451 | void trace_array_put(struct trace_array *this_tr) |
452 | { | |
28879787 DI |
453 | if (!this_tr) |
454 | return; | |
455 | ||
ff451961 SRRH |
456 | mutex_lock(&trace_types_lock); |
457 | __trace_array_put(this_tr); | |
458 | mutex_unlock(&trace_types_lock); | |
459 | } | |
28879787 | 460 | EXPORT_SYMBOL_GPL(trace_array_put); |
ff451961 | 461 | |
8530dec6 SRV |
462 | int tracing_check_open_get_tr(struct trace_array *tr) |
463 | { | |
17911ff3 SRV |
464 | int ret; |
465 | ||
466 | ret = security_locked_down(LOCKDOWN_TRACEFS); | |
467 | if (ret) | |
468 | return ret; | |
469 | ||
8530dec6 SRV |
470 | if (tracing_disabled) |
471 | return -ENODEV; | |
472 | ||
473 | if (tr && trace_array_get(tr) < 0) | |
474 | return -ENODEV; | |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
2425bcb9 | 479 | int call_filter_check_discard(struct trace_event_call *call, void *rec, |
13292494 | 480 | struct trace_buffer *buffer, |
f306cc82 TZ |
481 | struct ring_buffer_event *event) |
482 | { | |
483 | if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) && | |
484 | !filter_match_preds(call->filter, rec)) { | |
0fc1b09f | 485 | __trace_event_discard_commit(buffer, event); |
f306cc82 TZ |
486 | return 1; |
487 | } | |
488 | ||
489 | return 0; | |
eb02ce01 TZ |
490 | } |
491 | ||
76c813e2 SRRH |
492 | void trace_free_pid_list(struct trace_pid_list *pid_list) |
493 | { | |
494 | vfree(pid_list->pids); | |
495 | kfree(pid_list); | |
496 | } | |
497 | ||
d8275c45 SR |
498 | /** |
499 | * trace_find_filtered_pid - check if a pid exists in a filtered_pid list | |
500 | * @filtered_pids: The list of pids to check | |
501 | * @search_pid: The PID to find in @filtered_pids | |
502 | * | |
503 | * Returns true if @search_pid is fonud in @filtered_pids, and false otherwis. | |
504 | */ | |
505 | bool | |
506 | trace_find_filtered_pid(struct trace_pid_list *filtered_pids, pid_t search_pid) | |
507 | { | |
508 | /* | |
509 | * If pid_max changed after filtered_pids was created, we | |
510 | * by default ignore all pids greater than the previous pid_max. | |
511 | */ | |
512 | if (search_pid >= filtered_pids->pid_max) | |
513 | return false; | |
514 | ||
515 | return test_bit(search_pid, filtered_pids->pids); | |
516 | } | |
517 | ||
518 | /** | |
519 | * trace_ignore_this_task - should a task be ignored for tracing | |
520 | * @filtered_pids: The list of pids to check | |
521 | * @task: The task that should be ignored if not filtered | |
522 | * | |
523 | * Checks if @task should be traced or not from @filtered_pids. | |
524 | * Returns true if @task should *NOT* be traced. | |
525 | * Returns false if @task should be traced. | |
526 | */ | |
527 | bool | |
b3b1e6ed SRV |
528 | trace_ignore_this_task(struct trace_pid_list *filtered_pids, |
529 | struct trace_pid_list *filtered_no_pids, | |
530 | struct task_struct *task) | |
d8275c45 SR |
531 | { |
532 | /* | |
b3b1e6ed SRV |
533 | * If filterd_no_pids is not empty, and the task's pid is listed |
534 | * in filtered_no_pids, then return true. | |
535 | * Otherwise, if filtered_pids is empty, that means we can | |
536 | * trace all tasks. If it has content, then only trace pids | |
537 | * within filtered_pids. | |
d8275c45 | 538 | */ |
d8275c45 | 539 | |
b3b1e6ed SRV |
540 | return (filtered_pids && |
541 | !trace_find_filtered_pid(filtered_pids, task->pid)) || | |
542 | (filtered_no_pids && | |
543 | trace_find_filtered_pid(filtered_no_pids, task->pid)); | |
d8275c45 SR |
544 | } |
545 | ||
546 | /** | |
f08367b3 | 547 | * trace_filter_add_remove_task - Add or remove a task from a pid_list |
d8275c45 SR |
548 | * @pid_list: The list to modify |
549 | * @self: The current task for fork or NULL for exit | |
550 | * @task: The task to add or remove | |
551 | * | |
552 | * If adding a task, if @self is defined, the task is only added if @self | |
553 | * is also included in @pid_list. This happens on fork and tasks should | |
554 | * only be added when the parent is listed. If @self is NULL, then the | |
555 | * @task pid will be removed from the list, which would happen on exit | |
556 | * of a task. | |
557 | */ | |
558 | void trace_filter_add_remove_task(struct trace_pid_list *pid_list, | |
559 | struct task_struct *self, | |
560 | struct task_struct *task) | |
561 | { | |
562 | if (!pid_list) | |
563 | return; | |
564 | ||
565 | /* For forks, we only add if the forking task is listed */ | |
566 | if (self) { | |
567 | if (!trace_find_filtered_pid(pid_list, self->pid)) | |
568 | return; | |
569 | } | |
570 | ||
571 | /* Sorry, but we don't support pid_max changing after setting */ | |
572 | if (task->pid >= pid_list->pid_max) | |
573 | return; | |
574 | ||
575 | /* "self" is set for forks, and NULL for exits */ | |
576 | if (self) | |
577 | set_bit(task->pid, pid_list->pids); | |
578 | else | |
579 | clear_bit(task->pid, pid_list->pids); | |
580 | } | |
581 | ||
5cc8976b SRRH |
582 | /** |
583 | * trace_pid_next - Used for seq_file to get to the next pid of a pid_list | |
584 | * @pid_list: The pid list to show | |
585 | * @v: The last pid that was shown (+1 the actual pid to let zero be displayed) | |
586 | * @pos: The position of the file | |
587 | * | |
588 | * This is used by the seq_file "next" operation to iterate the pids | |
589 | * listed in a trace_pid_list structure. | |
590 | * | |
591 | * Returns the pid+1 as we want to display pid of zero, but NULL would | |
592 | * stop the iteration. | |
593 | */ | |
594 | void *trace_pid_next(struct trace_pid_list *pid_list, void *v, loff_t *pos) | |
595 | { | |
596 | unsigned long pid = (unsigned long)v; | |
597 | ||
598 | (*pos)++; | |
599 | ||
600 | /* pid already is +1 of the actual prevous bit */ | |
601 | pid = find_next_bit(pid_list->pids, pid_list->pid_max, pid); | |
602 | ||
603 | /* Return pid + 1 to allow zero to be represented */ | |
604 | if (pid < pid_list->pid_max) | |
605 | return (void *)(pid + 1); | |
606 | ||
607 | return NULL; | |
608 | } | |
609 | ||
610 | /** | |
611 | * trace_pid_start - Used for seq_file to start reading pid lists | |
612 | * @pid_list: The pid list to show | |
613 | * @pos: The position of the file | |
614 | * | |
615 | * This is used by seq_file "start" operation to start the iteration | |
616 | * of listing pids. | |
617 | * | |
618 | * Returns the pid+1 as we want to display pid of zero, but NULL would | |
619 | * stop the iteration. | |
620 | */ | |
621 | void *trace_pid_start(struct trace_pid_list *pid_list, loff_t *pos) | |
622 | { | |
623 | unsigned long pid; | |
624 | loff_t l = 0; | |
625 | ||
626 | pid = find_first_bit(pid_list->pids, pid_list->pid_max); | |
627 | if (pid >= pid_list->pid_max) | |
628 | return NULL; | |
629 | ||
630 | /* Return pid + 1 so that zero can be the exit value */ | |
631 | for (pid++; pid && l < *pos; | |
632 | pid = (unsigned long)trace_pid_next(pid_list, (void *)pid, &l)) | |
633 | ; | |
634 | return (void *)pid; | |
635 | } | |
636 | ||
637 | /** | |
638 | * trace_pid_show - show the current pid in seq_file processing | |
639 | * @m: The seq_file structure to write into | |
640 | * @v: A void pointer of the pid (+1) value to display | |
641 | * | |
642 | * Can be directly used by seq_file operations to display the current | |
643 | * pid value. | |
644 | */ | |
645 | int trace_pid_show(struct seq_file *m, void *v) | |
646 | { | |
647 | unsigned long pid = (unsigned long)v - 1; | |
648 | ||
649 | seq_printf(m, "%lu\n", pid); | |
650 | return 0; | |
651 | } | |
652 | ||
76c813e2 SRRH |
653 | /* 128 should be much more than enough */ |
654 | #define PID_BUF_SIZE 127 | |
655 | ||
656 | int trace_pid_write(struct trace_pid_list *filtered_pids, | |
657 | struct trace_pid_list **new_pid_list, | |
658 | const char __user *ubuf, size_t cnt) | |
659 | { | |
660 | struct trace_pid_list *pid_list; | |
661 | struct trace_parser parser; | |
662 | unsigned long val; | |
663 | int nr_pids = 0; | |
664 | ssize_t read = 0; | |
665 | ssize_t ret = 0; | |
666 | loff_t pos; | |
667 | pid_t pid; | |
668 | ||
669 | if (trace_parser_get_init(&parser, PID_BUF_SIZE + 1)) | |
670 | return -ENOMEM; | |
671 | ||
672 | /* | |
673 | * Always recreate a new array. The write is an all or nothing | |
674 | * operation. Always create a new array when adding new pids by | |
675 | * the user. If the operation fails, then the current list is | |
676 | * not modified. | |
677 | */ | |
678 | pid_list = kmalloc(sizeof(*pid_list), GFP_KERNEL); | |
91862cc7 WW |
679 | if (!pid_list) { |
680 | trace_parser_put(&parser); | |
76c813e2 | 681 | return -ENOMEM; |
91862cc7 | 682 | } |
76c813e2 SRRH |
683 | |
684 | pid_list->pid_max = READ_ONCE(pid_max); | |
685 | ||
686 | /* Only truncating will shrink pid_max */ | |
687 | if (filtered_pids && filtered_pids->pid_max > pid_list->pid_max) | |
688 | pid_list->pid_max = filtered_pids->pid_max; | |
689 | ||
690 | pid_list->pids = vzalloc((pid_list->pid_max + 7) >> 3); | |
691 | if (!pid_list->pids) { | |
91862cc7 | 692 | trace_parser_put(&parser); |
76c813e2 SRRH |
693 | kfree(pid_list); |
694 | return -ENOMEM; | |
695 | } | |
696 | ||
697 | if (filtered_pids) { | |
698 | /* copy the current bits to the new max */ | |
67f20b08 WY |
699 | for_each_set_bit(pid, filtered_pids->pids, |
700 | filtered_pids->pid_max) { | |
76c813e2 | 701 | set_bit(pid, pid_list->pids); |
76c813e2 SRRH |
702 | nr_pids++; |
703 | } | |
704 | } | |
705 | ||
706 | while (cnt > 0) { | |
707 | ||
708 | pos = 0; | |
709 | ||
710 | ret = trace_get_user(&parser, ubuf, cnt, &pos); | |
711 | if (ret < 0 || !trace_parser_loaded(&parser)) | |
712 | break; | |
713 | ||
714 | read += ret; | |
715 | ubuf += ret; | |
716 | cnt -= ret; | |
717 | ||
76c813e2 SRRH |
718 | ret = -EINVAL; |
719 | if (kstrtoul(parser.buffer, 0, &val)) | |
720 | break; | |
721 | if (val >= pid_list->pid_max) | |
722 | break; | |
723 | ||
724 | pid = (pid_t)val; | |
725 | ||
726 | set_bit(pid, pid_list->pids); | |
727 | nr_pids++; | |
728 | ||
729 | trace_parser_clear(&parser); | |
730 | ret = 0; | |
731 | } | |
732 | trace_parser_put(&parser); | |
733 | ||
734 | if (ret < 0) { | |
735 | trace_free_pid_list(pid_list); | |
736 | return ret; | |
737 | } | |
738 | ||
739 | if (!nr_pids) { | |
740 | /* Cleared the list of pids */ | |
741 | trace_free_pid_list(pid_list); | |
742 | read = ret; | |
743 | pid_list = NULL; | |
744 | } | |
745 | ||
746 | *new_pid_list = pid_list; | |
747 | ||
748 | return read; | |
749 | } | |
750 | ||
1c5eb448 | 751 | static u64 buffer_ftrace_now(struct array_buffer *buf, int cpu) |
37886f6a SR |
752 | { |
753 | u64 ts; | |
754 | ||
755 | /* Early boot up does not have a buffer yet */ | |
9457158b | 756 | if (!buf->buffer) |
37886f6a SR |
757 | return trace_clock_local(); |
758 | ||
9457158b AL |
759 | ts = ring_buffer_time_stamp(buf->buffer, cpu); |
760 | ring_buffer_normalize_time_stamp(buf->buffer, cpu, &ts); | |
37886f6a SR |
761 | |
762 | return ts; | |
763 | } | |
bc0c38d1 | 764 | |
a5a1d1c2 | 765 | u64 ftrace_now(int cpu) |
9457158b | 766 | { |
1c5eb448 | 767 | return buffer_ftrace_now(&global_trace.array_buffer, cpu); |
9457158b AL |
768 | } |
769 | ||
10246fa3 SRRH |
770 | /** |
771 | * tracing_is_enabled - Show if global_trace has been disabled | |
772 | * | |
773 | * Shows if the global trace has been enabled or not. It uses the | |
774 | * mirror flag "buffer_disabled" to be used in fast paths such as for | |
775 | * the irqsoff tracer. But it may be inaccurate due to races. If you | |
776 | * need to know the accurate state, use tracing_is_on() which is a little | |
777 | * slower, but accurate. | |
778 | */ | |
9036990d SR |
779 | int tracing_is_enabled(void) |
780 | { | |
10246fa3 SRRH |
781 | /* |
782 | * For quick access (irqsoff uses this in fast path), just | |
783 | * return the mirror variable of the state of the ring buffer. | |
784 | * It's a little racy, but we don't really care. | |
785 | */ | |
786 | smp_rmb(); | |
787 | return !global_trace.buffer_disabled; | |
9036990d SR |
788 | } |
789 | ||
4fcdae83 | 790 | /* |
3928a8a2 SR |
791 | * trace_buf_size is the size in bytes that is allocated |
792 | * for a buffer. Note, the number of bytes is always rounded | |
793 | * to page size. | |
3f5a54e3 SR |
794 | * |
795 | * This number is purposely set to a low number of 16384. | |
796 | * If the dump on oops happens, it will be much appreciated | |
797 | * to not have to wait for all that output. Anyway this can be | |
798 | * boot time and run time configurable. | |
4fcdae83 | 799 | */ |
3928a8a2 | 800 | #define TRACE_BUF_SIZE_DEFAULT 1441792UL /* 16384 * 88 (sizeof(entry)) */ |
3f5a54e3 | 801 | |
3928a8a2 | 802 | static unsigned long trace_buf_size = TRACE_BUF_SIZE_DEFAULT; |
bc0c38d1 | 803 | |
4fcdae83 | 804 | /* trace_types holds a link list of available tracers. */ |
bc0c38d1 | 805 | static struct tracer *trace_types __read_mostly; |
4fcdae83 | 806 | |
4fcdae83 SR |
807 | /* |
808 | * trace_types_lock is used to protect the trace_types list. | |
4fcdae83 | 809 | */ |
a8227415 | 810 | DEFINE_MUTEX(trace_types_lock); |
4fcdae83 | 811 | |
7e53bd42 LJ |
812 | /* |
813 | * serialize the access of the ring buffer | |
814 | * | |
815 | * ring buffer serializes readers, but it is low level protection. | |
816 | * The validity of the events (which returns by ring_buffer_peek() ..etc) | |
817 | * are not protected by ring buffer. | |
818 | * | |
819 | * The content of events may become garbage if we allow other process consumes | |
820 | * these events concurrently: | |
821 | * A) the page of the consumed events may become a normal page | |
822 | * (not reader page) in ring buffer, and this page will be rewrited | |
823 | * by events producer. | |
824 | * B) The page of the consumed events may become a page for splice_read, | |
825 | * and this page will be returned to system. | |
826 | * | |
827 | * These primitives allow multi process access to different cpu ring buffer | |
828 | * concurrently. | |
829 | * | |
830 | * These primitives don't distinguish read-only and read-consume access. | |
831 | * Multi read-only access are also serialized. | |
832 | */ | |
833 | ||
834 | #ifdef CONFIG_SMP | |
835 | static DECLARE_RWSEM(all_cpu_access_lock); | |
836 | static DEFINE_PER_CPU(struct mutex, cpu_access_lock); | |
837 | ||
838 | static inline void trace_access_lock(int cpu) | |
839 | { | |
ae3b5093 | 840 | if (cpu == RING_BUFFER_ALL_CPUS) { |
7e53bd42 LJ |
841 | /* gain it for accessing the whole ring buffer. */ |
842 | down_write(&all_cpu_access_lock); | |
843 | } else { | |
844 | /* gain it for accessing a cpu ring buffer. */ | |
845 | ||
ae3b5093 | 846 | /* Firstly block other trace_access_lock(RING_BUFFER_ALL_CPUS). */ |
7e53bd42 LJ |
847 | down_read(&all_cpu_access_lock); |
848 | ||
849 | /* Secondly block other access to this @cpu ring buffer. */ | |
850 | mutex_lock(&per_cpu(cpu_access_lock, cpu)); | |
851 | } | |
852 | } | |
853 | ||
854 | static inline void trace_access_unlock(int cpu) | |
855 | { | |
ae3b5093 | 856 | if (cpu == RING_BUFFER_ALL_CPUS) { |
7e53bd42 LJ |
857 | up_write(&all_cpu_access_lock); |
858 | } else { | |
859 | mutex_unlock(&per_cpu(cpu_access_lock, cpu)); | |
860 | up_read(&all_cpu_access_lock); | |
861 | } | |
862 | } | |
863 | ||
864 | static inline void trace_access_lock_init(void) | |
865 | { | |
866 | int cpu; | |
867 | ||
868 | for_each_possible_cpu(cpu) | |
869 | mutex_init(&per_cpu(cpu_access_lock, cpu)); | |
870 | } | |
871 | ||
872 | #else | |
873 | ||
874 | static DEFINE_MUTEX(access_lock); | |
875 | ||
876 | static inline void trace_access_lock(int cpu) | |
877 | { | |
878 | (void)cpu; | |
879 | mutex_lock(&access_lock); | |
880 | } | |
881 | ||
882 | static inline void trace_access_unlock(int cpu) | |
883 | { | |
884 | (void)cpu; | |
885 | mutex_unlock(&access_lock); | |
886 | } | |
887 | ||
888 | static inline void trace_access_lock_init(void) | |
889 | { | |
890 | } | |
891 | ||
892 | #endif | |
893 | ||
d78a4614 | 894 | #ifdef CONFIG_STACKTRACE |
13292494 | 895 | static void __ftrace_trace_stack(struct trace_buffer *buffer, |
d78a4614 SRRH |
896 | unsigned long flags, |
897 | int skip, int pc, struct pt_regs *regs); | |
2d34f489 | 898 | static inline void ftrace_trace_stack(struct trace_array *tr, |
13292494 | 899 | struct trace_buffer *buffer, |
73dddbb5 SRRH |
900 | unsigned long flags, |
901 | int skip, int pc, struct pt_regs *regs); | |
ca475e83 | 902 | |
d78a4614 | 903 | #else |
13292494 | 904 | static inline void __ftrace_trace_stack(struct trace_buffer *buffer, |
d78a4614 SRRH |
905 | unsigned long flags, |
906 | int skip, int pc, struct pt_regs *regs) | |
907 | { | |
908 | } | |
2d34f489 | 909 | static inline void ftrace_trace_stack(struct trace_array *tr, |
13292494 | 910 | struct trace_buffer *buffer, |
73dddbb5 SRRH |
911 | unsigned long flags, |
912 | int skip, int pc, struct pt_regs *regs) | |
ca475e83 SRRH |
913 | { |
914 | } | |
915 | ||
d78a4614 SRRH |
916 | #endif |
917 | ||
3e9a8aad SRRH |
918 | static __always_inline void |
919 | trace_event_setup(struct ring_buffer_event *event, | |
920 | int type, unsigned long flags, int pc) | |
921 | { | |
922 | struct trace_entry *ent = ring_buffer_event_data(event); | |
923 | ||
46710f3a | 924 | tracing_generic_entry_update(ent, type, flags, pc); |
3e9a8aad SRRH |
925 | } |
926 | ||
927 | static __always_inline struct ring_buffer_event * | |
13292494 | 928 | __trace_buffer_lock_reserve(struct trace_buffer *buffer, |
3e9a8aad SRRH |
929 | int type, |
930 | unsigned long len, | |
931 | unsigned long flags, int pc) | |
932 | { | |
933 | struct ring_buffer_event *event; | |
934 | ||
935 | event = ring_buffer_lock_reserve(buffer, len); | |
936 | if (event != NULL) | |
937 | trace_event_setup(event, type, flags, pc); | |
938 | ||
939 | return event; | |
940 | } | |
941 | ||
2290f2c5 | 942 | void tracer_tracing_on(struct trace_array *tr) |
10246fa3 | 943 | { |
1c5eb448 SRV |
944 | if (tr->array_buffer.buffer) |
945 | ring_buffer_record_on(tr->array_buffer.buffer); | |
10246fa3 SRRH |
946 | /* |
947 | * This flag is looked at when buffers haven't been allocated | |
948 | * yet, or by some tracers (like irqsoff), that just want to | |
949 | * know if the ring buffer has been disabled, but it can handle | |
950 | * races of where it gets disabled but we still do a record. | |
951 | * As the check is in the fast path of the tracers, it is more | |
952 | * important to be fast than accurate. | |
953 | */ | |
954 | tr->buffer_disabled = 0; | |
955 | /* Make the flag seen by readers */ | |
956 | smp_wmb(); | |
957 | } | |
958 | ||
499e5470 SR |
959 | /** |
960 | * tracing_on - enable tracing buffers | |
961 | * | |
962 | * This function enables tracing buffers that may have been | |
963 | * disabled with tracing_off. | |
964 | */ | |
965 | void tracing_on(void) | |
966 | { | |
10246fa3 | 967 | tracer_tracing_on(&global_trace); |
499e5470 SR |
968 | } |
969 | EXPORT_SYMBOL_GPL(tracing_on); | |
970 | ||
52ffabe3 SRRH |
971 | |
972 | static __always_inline void | |
13292494 | 973 | __buffer_unlock_commit(struct trace_buffer *buffer, struct ring_buffer_event *event) |
52ffabe3 | 974 | { |
d914ba37 | 975 | __this_cpu_write(trace_taskinfo_save, true); |
52ffabe3 SRRH |
976 | |
977 | /* If this is the temp buffer, we need to commit fully */ | |
978 | if (this_cpu_read(trace_buffered_event) == event) { | |
979 | /* Length is in event->array[0] */ | |
980 | ring_buffer_write(buffer, event->array[0], &event->array[1]); | |
981 | /* Release the temp buffer */ | |
982 | this_cpu_dec(trace_buffered_event_cnt); | |
983 | } else | |
984 | ring_buffer_unlock_commit(buffer, event); | |
985 | } | |
986 | ||
09ae7234 SRRH |
987 | /** |
988 | * __trace_puts - write a constant string into the trace buffer. | |
989 | * @ip: The address of the caller | |
990 | * @str: The constant string to write | |
991 | * @size: The size of the string. | |
992 | */ | |
993 | int __trace_puts(unsigned long ip, const char *str, int size) | |
994 | { | |
995 | struct ring_buffer_event *event; | |
13292494 | 996 | struct trace_buffer *buffer; |
09ae7234 SRRH |
997 | struct print_entry *entry; |
998 | unsigned long irq_flags; | |
999 | int alloc; | |
8abfb872 J |
1000 | int pc; |
1001 | ||
983f938a | 1002 | if (!(global_trace.trace_flags & TRACE_ITER_PRINTK)) |
f0160a5a J |
1003 | return 0; |
1004 | ||
8abfb872 | 1005 | pc = preempt_count(); |
09ae7234 | 1006 | |
3132e107 SRRH |
1007 | if (unlikely(tracing_selftest_running || tracing_disabled)) |
1008 | return 0; | |
1009 | ||
09ae7234 SRRH |
1010 | alloc = sizeof(*entry) + size + 2; /* possible \n added */ |
1011 | ||
1012 | local_save_flags(irq_flags); | |
1c5eb448 | 1013 | buffer = global_trace.array_buffer.buffer; |
82d1b815 | 1014 | ring_buffer_nest_start(buffer); |
3e9a8aad SRRH |
1015 | event = __trace_buffer_lock_reserve(buffer, TRACE_PRINT, alloc, |
1016 | irq_flags, pc); | |
82d1b815 SRV |
1017 | if (!event) { |
1018 | size = 0; | |
1019 | goto out; | |
1020 | } | |
09ae7234 SRRH |
1021 | |
1022 | entry = ring_buffer_event_data(event); | |
1023 | entry->ip = ip; | |
1024 | ||
1025 | memcpy(&entry->buf, str, size); | |
1026 | ||
1027 | /* Add a newline if necessary */ | |
1028 | if (entry->buf[size - 1] != '\n') { | |
1029 | entry->buf[size] = '\n'; | |
1030 | entry->buf[size + 1] = '\0'; | |
1031 | } else | |
1032 | entry->buf[size] = '\0'; | |
1033 | ||
1034 | __buffer_unlock_commit(buffer, event); | |
2d34f489 | 1035 | ftrace_trace_stack(&global_trace, buffer, irq_flags, 4, pc, NULL); |
82d1b815 SRV |
1036 | out: |
1037 | ring_buffer_nest_end(buffer); | |
09ae7234 SRRH |
1038 | return size; |
1039 | } | |
1040 | EXPORT_SYMBOL_GPL(__trace_puts); | |
1041 | ||
1042 | /** | |
1043 | * __trace_bputs - write the pointer to a constant string into trace buffer | |
1044 | * @ip: The address of the caller | |
1045 | * @str: The constant string to write to the buffer to | |
1046 | */ | |
1047 | int __trace_bputs(unsigned long ip, const char *str) | |
1048 | { | |
1049 | struct ring_buffer_event *event; | |
13292494 | 1050 | struct trace_buffer *buffer; |
09ae7234 SRRH |
1051 | struct bputs_entry *entry; |
1052 | unsigned long irq_flags; | |
1053 | int size = sizeof(struct bputs_entry); | |
82d1b815 | 1054 | int ret = 0; |
8abfb872 J |
1055 | int pc; |
1056 | ||
983f938a | 1057 | if (!(global_trace.trace_flags & TRACE_ITER_PRINTK)) |
f0160a5a J |
1058 | return 0; |
1059 | ||
8abfb872 | 1060 | pc = preempt_count(); |
09ae7234 | 1061 | |
3132e107 SRRH |
1062 | if (unlikely(tracing_selftest_running || tracing_disabled)) |
1063 | return 0; | |
1064 | ||
09ae7234 | 1065 | local_save_flags(irq_flags); |
1c5eb448 | 1066 | buffer = global_trace.array_buffer.buffer; |
82d1b815 SRV |
1067 | |
1068 | ring_buffer_nest_start(buffer); | |
3e9a8aad SRRH |
1069 | event = __trace_buffer_lock_reserve(buffer, TRACE_BPUTS, size, |
1070 | irq_flags, pc); | |
09ae7234 | 1071 | if (!event) |
82d1b815 | 1072 | goto out; |
09ae7234 SRRH |
1073 | |
1074 | entry = ring_buffer_event_data(event); | |
1075 | entry->ip = ip; | |
1076 | entry->str = str; | |
1077 | ||
1078 | __buffer_unlock_commit(buffer, event); | |
2d34f489 | 1079 | ftrace_trace_stack(&global_trace, buffer, irq_flags, 4, pc, NULL); |
09ae7234 | 1080 | |
82d1b815 SRV |
1081 | ret = 1; |
1082 | out: | |
1083 | ring_buffer_nest_end(buffer); | |
1084 | return ret; | |
09ae7234 SRRH |
1085 | } |
1086 | EXPORT_SYMBOL_GPL(__trace_bputs); | |
1087 | ||
ad909e21 | 1088 | #ifdef CONFIG_TRACER_SNAPSHOT |
192b7993 ZW |
1089 | static void tracing_snapshot_instance_cond(struct trace_array *tr, |
1090 | void *cond_data) | |
ad909e21 | 1091 | { |
ad909e21 SRRH |
1092 | struct tracer *tracer = tr->current_trace; |
1093 | unsigned long flags; | |
1094 | ||
1b22e382 SRRH |
1095 | if (in_nmi()) { |
1096 | internal_trace_puts("*** SNAPSHOT CALLED FROM NMI CONTEXT ***\n"); | |
1097 | internal_trace_puts("*** snapshot is being ignored ***\n"); | |
1098 | return; | |
1099 | } | |
1100 | ||
ad909e21 | 1101 | if (!tr->allocated_snapshot) { |
ca268da6 SRRH |
1102 | internal_trace_puts("*** SNAPSHOT NOT ALLOCATED ***\n"); |
1103 | internal_trace_puts("*** stopping trace here! ***\n"); | |
ad909e21 SRRH |
1104 | tracing_off(); |
1105 | return; | |
1106 | } | |
1107 | ||
1108 | /* Note, snapshot can not be used when the tracer uses it */ | |
1109 | if (tracer->use_max_tr) { | |
ca268da6 SRRH |
1110 | internal_trace_puts("*** LATENCY TRACER ACTIVE ***\n"); |
1111 | internal_trace_puts("*** Can not use snapshot (sorry) ***\n"); | |
ad909e21 SRRH |
1112 | return; |
1113 | } | |
1114 | ||
1115 | local_irq_save(flags); | |
a35873a0 | 1116 | update_max_tr(tr, current, smp_processor_id(), cond_data); |
ad909e21 SRRH |
1117 | local_irq_restore(flags); |
1118 | } | |
cab50379 | 1119 | |
a35873a0 TZ |
1120 | void tracing_snapshot_instance(struct trace_array *tr) |
1121 | { | |
1122 | tracing_snapshot_instance_cond(tr, NULL); | |
1123 | } | |
1124 | ||
cab50379 | 1125 | /** |
5a93bae2 | 1126 | * tracing_snapshot - take a snapshot of the current buffer. |
cab50379 SRV |
1127 | * |
1128 | * This causes a swap between the snapshot buffer and the current live | |
1129 | * tracing buffer. You can use this to take snapshots of the live | |
1130 | * trace when some condition is triggered, but continue to trace. | |
1131 | * | |
1132 | * Note, make sure to allocate the snapshot with either | |
1133 | * a tracing_snapshot_alloc(), or by doing it manually | |
1134 | * with: echo 1 > /sys/kernel/debug/tracing/snapshot | |
1135 | * | |
1136 | * If the snapshot buffer is not allocated, it will stop tracing. | |
1137 | * Basically making a permanent snapshot. | |
1138 | */ | |
1139 | void tracing_snapshot(void) | |
1140 | { | |
1141 | struct trace_array *tr = &global_trace; | |
1142 | ||
1143 | tracing_snapshot_instance(tr); | |
1144 | } | |
1b22e382 | 1145 | EXPORT_SYMBOL_GPL(tracing_snapshot); |
ad909e21 | 1146 | |
a35873a0 TZ |
1147 | /** |
1148 | * tracing_snapshot_cond - conditionally take a snapshot of the current buffer. | |
1149 | * @tr: The tracing instance to snapshot | |
1150 | * @cond_data: The data to be tested conditionally, and possibly saved | |
1151 | * | |
1152 | * This is the same as tracing_snapshot() except that the snapshot is | |
1153 | * conditional - the snapshot will only happen if the | |
1154 | * cond_snapshot.update() implementation receiving the cond_data | |
1155 | * returns true, which means that the trace array's cond_snapshot | |
1156 | * update() operation used the cond_data to determine whether the | |
1157 | * snapshot should be taken, and if it was, presumably saved it along | |
1158 | * with the snapshot. | |
1159 | */ | |
1160 | void tracing_snapshot_cond(struct trace_array *tr, void *cond_data) | |
1161 | { | |
1162 | tracing_snapshot_instance_cond(tr, cond_data); | |
1163 | } | |
1164 | EXPORT_SYMBOL_GPL(tracing_snapshot_cond); | |
1165 | ||
1166 | /** | |
1167 | * tracing_snapshot_cond_data - get the user data associated with a snapshot | |
1168 | * @tr: The tracing instance | |
1169 | * | |
1170 | * When the user enables a conditional snapshot using | |
1171 | * tracing_snapshot_cond_enable(), the user-defined cond_data is saved | |
1172 | * with the snapshot. This accessor is used to retrieve it. | |
1173 | * | |
1174 | * Should not be called from cond_snapshot.update(), since it takes | |
1175 | * the tr->max_lock lock, which the code calling | |
1176 | * cond_snapshot.update() has already done. | |
1177 | * | |
1178 | * Returns the cond_data associated with the trace array's snapshot. | |
1179 | */ | |
1180 | void *tracing_cond_snapshot_data(struct trace_array *tr) | |
1181 | { | |
1182 | void *cond_data = NULL; | |
1183 | ||
1184 | arch_spin_lock(&tr->max_lock); | |
1185 | ||
1186 | if (tr->cond_snapshot) | |
1187 | cond_data = tr->cond_snapshot->cond_data; | |
1188 | ||
1189 | arch_spin_unlock(&tr->max_lock); | |
1190 | ||
1191 | return cond_data; | |
1192 | } | |
1193 | EXPORT_SYMBOL_GPL(tracing_cond_snapshot_data); | |
1194 | ||
1c5eb448 SRV |
1195 | static int resize_buffer_duplicate_size(struct array_buffer *trace_buf, |
1196 | struct array_buffer *size_buf, int cpu_id); | |
1197 | static void set_buffer_entries(struct array_buffer *buf, unsigned long val); | |
3209cff4 | 1198 | |
2824f503 | 1199 | int tracing_alloc_snapshot_instance(struct trace_array *tr) |
3209cff4 SRRH |
1200 | { |
1201 | int ret; | |
1202 | ||
1203 | if (!tr->allocated_snapshot) { | |
1204 | ||
1205 | /* allocate spare buffer */ | |
1206 | ret = resize_buffer_duplicate_size(&tr->max_buffer, | |
1c5eb448 | 1207 | &tr->array_buffer, RING_BUFFER_ALL_CPUS); |
3209cff4 SRRH |
1208 | if (ret < 0) |
1209 | return ret; | |
1210 | ||
1211 | tr->allocated_snapshot = true; | |
1212 | } | |
1213 | ||
1214 | return 0; | |
1215 | } | |
1216 | ||
ad1438a0 | 1217 | static void free_snapshot(struct trace_array *tr) |
3209cff4 SRRH |
1218 | { |
1219 | /* | |
1220 | * We don't free the ring buffer. instead, resize it because | |
1221 | * The max_tr ring buffer has some state (e.g. ring->clock) and | |
1222 | * we want preserve it. | |
1223 | */ | |
1224 | ring_buffer_resize(tr->max_buffer.buffer, 1, RING_BUFFER_ALL_CPUS); | |
1225 | set_buffer_entries(&tr->max_buffer, 1); | |
1226 | tracing_reset_online_cpus(&tr->max_buffer); | |
1227 | tr->allocated_snapshot = false; | |
1228 | } | |
ad909e21 | 1229 | |
93e31ffb TZ |
1230 | /** |
1231 | * tracing_alloc_snapshot - allocate snapshot buffer. | |
1232 | * | |
1233 | * This only allocates the snapshot buffer if it isn't already | |
1234 | * allocated - it doesn't also take a snapshot. | |
1235 | * | |
1236 | * This is meant to be used in cases where the snapshot buffer needs | |
1237 | * to be set up for events that can't sleep but need to be able to | |
1238 | * trigger a snapshot. | |
1239 | */ | |
1240 | int tracing_alloc_snapshot(void) | |
1241 | { | |
1242 | struct trace_array *tr = &global_trace; | |
1243 | int ret; | |
1244 | ||
2824f503 | 1245 | ret = tracing_alloc_snapshot_instance(tr); |
93e31ffb TZ |
1246 | WARN_ON(ret < 0); |
1247 | ||
1248 | return ret; | |
1249 | } | |
1250 | EXPORT_SYMBOL_GPL(tracing_alloc_snapshot); | |
1251 | ||
ad909e21 | 1252 | /** |
5a93bae2 | 1253 | * tracing_snapshot_alloc - allocate and take a snapshot of the current buffer. |
ad909e21 | 1254 | * |
5a93bae2 | 1255 | * This is similar to tracing_snapshot(), but it will allocate the |
ad909e21 SRRH |
1256 | * snapshot buffer if it isn't already allocated. Use this only |
1257 | * where it is safe to sleep, as the allocation may sleep. | |
1258 | * | |
1259 | * This causes a swap between the snapshot buffer and the current live | |
1260 | * tracing buffer. You can use this to take snapshots of the live | |
1261 | * trace when some condition is triggered, but continue to trace. | |
1262 | */ | |
1263 | void tracing_snapshot_alloc(void) | |
1264 | { | |
ad909e21 SRRH |
1265 | int ret; |
1266 | ||
93e31ffb TZ |
1267 | ret = tracing_alloc_snapshot(); |
1268 | if (ret < 0) | |
3209cff4 | 1269 | return; |
ad909e21 SRRH |
1270 | |
1271 | tracing_snapshot(); | |
1272 | } | |
1b22e382 | 1273 | EXPORT_SYMBOL_GPL(tracing_snapshot_alloc); |
a35873a0 TZ |
1274 | |
1275 | /** | |
1276 | * tracing_snapshot_cond_enable - enable conditional snapshot for an instance | |
1277 | * @tr: The tracing instance | |
1278 | * @cond_data: User data to associate with the snapshot | |
1279 | * @update: Implementation of the cond_snapshot update function | |
1280 | * | |
1281 | * Check whether the conditional snapshot for the given instance has | |
1282 | * already been enabled, or if the current tracer is already using a | |
1283 | * snapshot; if so, return -EBUSY, else create a cond_snapshot and | |
1284 | * save the cond_data and update function inside. | |
1285 | * | |
1286 | * Returns 0 if successful, error otherwise. | |
1287 | */ | |
1288 | int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, | |
1289 | cond_update_fn_t update) | |
1290 | { | |
1291 | struct cond_snapshot *cond_snapshot; | |
1292 | int ret = 0; | |
1293 | ||
1294 | cond_snapshot = kzalloc(sizeof(*cond_snapshot), GFP_KERNEL); | |
1295 | if (!cond_snapshot) | |
1296 | return -ENOMEM; | |
1297 | ||
1298 | cond_snapshot->cond_data = cond_data; | |
1299 | cond_snapshot->update = update; | |
1300 | ||
1301 | mutex_lock(&trace_types_lock); | |
1302 | ||
1303 | ret = tracing_alloc_snapshot_instance(tr); | |
1304 | if (ret) | |
1305 | goto fail_unlock; | |
1306 | ||
1307 | if (tr->current_trace->use_max_tr) { | |
1308 | ret = -EBUSY; | |
1309 | goto fail_unlock; | |
1310 | } | |
1311 | ||
1c347a94 SRV |
1312 | /* |
1313 | * The cond_snapshot can only change to NULL without the | |
1314 | * trace_types_lock. We don't care if we race with it going | |
1315 | * to NULL, but we want to make sure that it's not set to | |
1316 | * something other than NULL when we get here, which we can | |
1317 | * do safely with only holding the trace_types_lock and not | |
1318 | * having to take the max_lock. | |
1319 | */ | |
a35873a0 TZ |
1320 | if (tr->cond_snapshot) { |
1321 | ret = -EBUSY; | |
1322 | goto fail_unlock; | |
1323 | } | |
1324 | ||
1325 | arch_spin_lock(&tr->max_lock); | |
1326 | tr->cond_snapshot = cond_snapshot; | |
1327 | arch_spin_unlock(&tr->max_lock); | |
1328 | ||
1329 | mutex_unlock(&trace_types_lock); | |
1330 | ||
1331 | return ret; | |
1332 | ||
1333 | fail_unlock: | |
1334 | mutex_unlock(&trace_types_lock); | |
1335 | kfree(cond_snapshot); | |
1336 | return ret; | |
1337 | } | |
1338 | EXPORT_SYMBOL_GPL(tracing_snapshot_cond_enable); | |
1339 | ||
1340 | /** | |
1341 | * tracing_snapshot_cond_disable - disable conditional snapshot for an instance | |
1342 | * @tr: The tracing instance | |
1343 | * | |
1344 | * Check whether the conditional snapshot for the given instance is | |
1345 | * enabled; if so, free the cond_snapshot associated with it, | |
1346 | * otherwise return -EINVAL. | |
1347 | * | |
1348 | * Returns 0 if successful, error otherwise. | |
1349 | */ | |
1350 | int tracing_snapshot_cond_disable(struct trace_array *tr) | |
1351 | { | |
1352 | int ret = 0; | |
1353 | ||
1354 | arch_spin_lock(&tr->max_lock); | |
1355 | ||
1356 | if (!tr->cond_snapshot) | |
1357 | ret = -EINVAL; | |
1358 | else { | |
1359 | kfree(tr->cond_snapshot); | |
1360 | tr->cond_snapshot = NULL; | |
1361 | } | |
1362 | ||
1363 | arch_spin_unlock(&tr->max_lock); | |
1364 | ||
1365 | return ret; | |
1366 | } | |
1367 | EXPORT_SYMBOL_GPL(tracing_snapshot_cond_disable); | |
ad909e21 SRRH |
1368 | #else |
1369 | void tracing_snapshot(void) | |
1370 | { | |
1371 | WARN_ONCE(1, "Snapshot feature not enabled, but internal snapshot used"); | |
1372 | } | |
1b22e382 | 1373 | EXPORT_SYMBOL_GPL(tracing_snapshot); |
a35873a0 TZ |
1374 | void tracing_snapshot_cond(struct trace_array *tr, void *cond_data) |
1375 | { | |
1376 | WARN_ONCE(1, "Snapshot feature not enabled, but internal conditional snapshot used"); | |
1377 | } | |
1378 | EXPORT_SYMBOL_GPL(tracing_snapshot_cond); | |
93e31ffb TZ |
1379 | int tracing_alloc_snapshot(void) |
1380 | { | |
1381 | WARN_ONCE(1, "Snapshot feature not enabled, but snapshot allocation used"); | |
1382 | return -ENODEV; | |
1383 | } | |
1384 | EXPORT_SYMBOL_GPL(tracing_alloc_snapshot); | |
ad909e21 SRRH |
1385 | void tracing_snapshot_alloc(void) |
1386 | { | |
1387 | /* Give warning */ | |
1388 | tracing_snapshot(); | |
1389 | } | |
1b22e382 | 1390 | EXPORT_SYMBOL_GPL(tracing_snapshot_alloc); |
a35873a0 TZ |
1391 | void *tracing_cond_snapshot_data(struct trace_array *tr) |
1392 | { | |
1393 | return NULL; | |
1394 | } | |
1395 | EXPORT_SYMBOL_GPL(tracing_cond_snapshot_data); | |
1396 | int tracing_snapshot_cond_enable(struct trace_array *tr, void *cond_data, cond_update_fn_t update) | |
1397 | { | |
1398 | return -ENODEV; | |
1399 | } | |
1400 | EXPORT_SYMBOL_GPL(tracing_snapshot_cond_enable); | |
1401 | int tracing_snapshot_cond_disable(struct trace_array *tr) | |
1402 | { | |
1403 | return false; | |
1404 | } | |
1405 | EXPORT_SYMBOL_GPL(tracing_snapshot_cond_disable); | |
ad909e21 SRRH |
1406 | #endif /* CONFIG_TRACER_SNAPSHOT */ |
1407 | ||
2290f2c5 | 1408 | void tracer_tracing_off(struct trace_array *tr) |
10246fa3 | 1409 | { |
1c5eb448 SRV |
1410 | if (tr->array_buffer.buffer) |
1411 | ring_buffer_record_off(tr->array_buffer.buffer); | |
10246fa3 SRRH |
1412 | /* |
1413 | * This flag is looked at when buffers haven't been allocated | |
1414 | * yet, or by some tracers (like irqsoff), that just want to | |
1415 | * know if the ring buffer has been disabled, but it can handle | |
1416 | * races of where it gets disabled but we still do a record. | |
1417 | * As the check is in the fast path of the tracers, it is more | |
1418 | * important to be fast than accurate. | |
1419 | */ | |
1420 | tr->buffer_disabled = 1; | |
1421 | /* Make the flag seen by readers */ | |
1422 | smp_wmb(); | |
1423 | } | |
1424 | ||
499e5470 SR |
1425 | /** |
1426 | * tracing_off - turn off tracing buffers | |
1427 | * | |
1428 | * This function stops the tracing buffers from recording data. | |
1429 | * It does not disable any overhead the tracers themselves may | |
1430 | * be causing. This function simply causes all recording to | |
1431 | * the ring buffers to fail. | |
1432 | */ | |
1433 | void tracing_off(void) | |
1434 | { | |
10246fa3 | 1435 | tracer_tracing_off(&global_trace); |
499e5470 SR |
1436 | } |
1437 | EXPORT_SYMBOL_GPL(tracing_off); | |
1438 | ||
de7edd31 SRRH |
1439 | void disable_trace_on_warning(void) |
1440 | { | |
c200784a SRV |
1441 | if (__disable_trace_on_warning) { |
1442 | trace_array_printk_buf(global_trace.array_buffer.buffer, _THIS_IP_, | |
1443 | "Disabling tracing due to warning\n"); | |
de7edd31 | 1444 | tracing_off(); |
c200784a | 1445 | } |
de7edd31 SRRH |
1446 | } |
1447 | ||
10246fa3 SRRH |
1448 | /** |
1449 | * tracer_tracing_is_on - show real state of ring buffer enabled | |
1450 | * @tr : the trace array to know if ring buffer is enabled | |
1451 | * | |
1452 | * Shows real state of the ring buffer if it is enabled or not. | |
1453 | */ | |
ec573508 | 1454 | bool tracer_tracing_is_on(struct trace_array *tr) |
10246fa3 | 1455 | { |
1c5eb448 SRV |
1456 | if (tr->array_buffer.buffer) |
1457 | return ring_buffer_record_is_on(tr->array_buffer.buffer); | |
10246fa3 SRRH |
1458 | return !tr->buffer_disabled; |
1459 | } | |
1460 | ||
499e5470 SR |
1461 | /** |
1462 | * tracing_is_on - show state of ring buffers enabled | |
1463 | */ | |
1464 | int tracing_is_on(void) | |
1465 | { | |
10246fa3 | 1466 | return tracer_tracing_is_on(&global_trace); |
499e5470 SR |
1467 | } |
1468 | EXPORT_SYMBOL_GPL(tracing_is_on); | |
1469 | ||
3928a8a2 | 1470 | static int __init set_buf_size(char *str) |
bc0c38d1 | 1471 | { |
3928a8a2 | 1472 | unsigned long buf_size; |
c6caeeb1 | 1473 | |
bc0c38d1 SR |
1474 | if (!str) |
1475 | return 0; | |
9d612bef | 1476 | buf_size = memparse(str, &str); |
c6caeeb1 | 1477 | /* nr_entries can not be zero */ |
9d612bef | 1478 | if (buf_size == 0) |
c6caeeb1 | 1479 | return 0; |
3928a8a2 | 1480 | trace_buf_size = buf_size; |
bc0c38d1 SR |
1481 | return 1; |
1482 | } | |
3928a8a2 | 1483 | __setup("trace_buf_size=", set_buf_size); |
bc0c38d1 | 1484 | |
0e950173 TB |
1485 | static int __init set_tracing_thresh(char *str) |
1486 | { | |
87abb3b1 | 1487 | unsigned long threshold; |
0e950173 TB |
1488 | int ret; |
1489 | ||
1490 | if (!str) | |
1491 | return 0; | |
bcd83ea6 | 1492 | ret = kstrtoul(str, 0, &threshold); |
0e950173 TB |
1493 | if (ret < 0) |
1494 | return 0; | |
87abb3b1 | 1495 | tracing_thresh = threshold * 1000; |
0e950173 TB |
1496 | return 1; |
1497 | } | |
1498 | __setup("tracing_thresh=", set_tracing_thresh); | |
1499 | ||
57f50be1 SR |
1500 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
1501 | { | |
1502 | return nsecs / 1000; | |
1503 | } | |
1504 | ||
a3418a36 SRRH |
1505 | /* |
1506 | * TRACE_FLAGS is defined as a tuple matching bit masks with strings. | |
f57a4143 | 1507 | * It uses C(a, b) where 'a' is the eval (enum) name and 'b' is the string that |
a3418a36 | 1508 | * matches it. By defining "C(a, b) b", TRACE_FLAGS becomes a list |
f57a4143 | 1509 | * of strings in the order that the evals (enum) were defined. |
a3418a36 SRRH |
1510 | */ |
1511 | #undef C | |
1512 | #define C(a, b) b | |
1513 | ||
4fcdae83 | 1514 | /* These must match the bit postions in trace_iterator_flags */ |
bc0c38d1 | 1515 | static const char *trace_options[] = { |
a3418a36 | 1516 | TRACE_FLAGS |
bc0c38d1 SR |
1517 | NULL |
1518 | }; | |
1519 | ||
5079f326 Z |
1520 | static struct { |
1521 | u64 (*func)(void); | |
1522 | const char *name; | |
8be0709f | 1523 | int in_ns; /* is this clock in nanoseconds? */ |
5079f326 | 1524 | } trace_clocks[] = { |
1b3e5c09 TG |
1525 | { trace_clock_local, "local", 1 }, |
1526 | { trace_clock_global, "global", 1 }, | |
1527 | { trace_clock_counter, "counter", 0 }, | |
e7fda6c4 | 1528 | { trace_clock_jiffies, "uptime", 0 }, |
1b3e5c09 TG |
1529 | { trace_clock, "perf", 1 }, |
1530 | { ktime_get_mono_fast_ns, "mono", 1 }, | |
aabfa5f2 | 1531 | { ktime_get_raw_fast_ns, "mono_raw", 1 }, |
a3ed0e43 | 1532 | { ktime_get_boot_fast_ns, "boot", 1 }, |
8cbd9cc6 | 1533 | ARCH_TRACE_CLOCKS |
5079f326 Z |
1534 | }; |
1535 | ||
860f9f6b TZ |
1536 | bool trace_clock_in_ns(struct trace_array *tr) |
1537 | { | |
1538 | if (trace_clocks[tr->clock_id].in_ns) | |
1539 | return true; | |
1540 | ||
1541 | return false; | |
1542 | } | |
1543 | ||
b63f39ea | 1544 | /* |
1545 | * trace_parser_get_init - gets the buffer for trace parser | |
1546 | */ | |
1547 | int trace_parser_get_init(struct trace_parser *parser, int size) | |
1548 | { | |
1549 | memset(parser, 0, sizeof(*parser)); | |
1550 | ||
1551 | parser->buffer = kmalloc(size, GFP_KERNEL); | |
1552 | if (!parser->buffer) | |
1553 | return 1; | |
1554 | ||
1555 | parser->size = size; | |
1556 | return 0; | |
1557 | } | |
1558 | ||
1559 | /* | |
1560 | * trace_parser_put - frees the buffer for trace parser | |
1561 | */ | |
1562 | void trace_parser_put(struct trace_parser *parser) | |
1563 | { | |
1564 | kfree(parser->buffer); | |
0e684b65 | 1565 | parser->buffer = NULL; |
b63f39ea | 1566 | } |
1567 | ||
1568 | /* | |
1569 | * trace_get_user - reads the user input string separated by space | |
1570 | * (matched by isspace(ch)) | |
1571 | * | |
1572 | * For each string found the 'struct trace_parser' is updated, | |
1573 | * and the function returns. | |
1574 | * | |
1575 | * Returns number of bytes read. | |
1576 | * | |
1577 | * See kernel/trace/trace.h for 'struct trace_parser' details. | |
1578 | */ | |
1579 | int trace_get_user(struct trace_parser *parser, const char __user *ubuf, | |
1580 | size_t cnt, loff_t *ppos) | |
1581 | { | |
1582 | char ch; | |
1583 | size_t read = 0; | |
1584 | ssize_t ret; | |
1585 | ||
1586 | if (!*ppos) | |
1587 | trace_parser_clear(parser); | |
1588 | ||
1589 | ret = get_user(ch, ubuf++); | |
1590 | if (ret) | |
1591 | goto out; | |
1592 | ||
1593 | read++; | |
1594 | cnt--; | |
1595 | ||
1596 | /* | |
1597 | * The parser is not finished with the last write, | |
1598 | * continue reading the user input without skipping spaces. | |
1599 | */ | |
1600 | if (!parser->cont) { | |
1601 | /* skip white space */ | |
1602 | while (cnt && isspace(ch)) { | |
1603 | ret = get_user(ch, ubuf++); | |
1604 | if (ret) | |
1605 | goto out; | |
1606 | read++; | |
1607 | cnt--; | |
1608 | } | |
1609 | ||
76638d96 CD |
1610 | parser->idx = 0; |
1611 | ||
b63f39ea | 1612 | /* only spaces were written */ |
921a7acd | 1613 | if (isspace(ch) || !ch) { |
b63f39ea | 1614 | *ppos += read; |
1615 | ret = read; | |
1616 | goto out; | |
1617 | } | |
b63f39ea | 1618 | } |
1619 | ||
1620 | /* read the non-space input */ | |
921a7acd | 1621 | while (cnt && !isspace(ch) && ch) { |
3c235a33 | 1622 | if (parser->idx < parser->size - 1) |
b63f39ea | 1623 | parser->buffer[parser->idx++] = ch; |
1624 | else { | |
1625 | ret = -EINVAL; | |
1626 | goto out; | |
1627 | } | |
1628 | ret = get_user(ch, ubuf++); | |
1629 | if (ret) | |
1630 | goto out; | |
1631 | read++; | |
1632 | cnt--; | |
1633 | } | |
1634 | ||
1635 | /* We either got finished input or we have to wait for another call. */ | |
921a7acd | 1636 | if (isspace(ch) || !ch) { |
b63f39ea | 1637 | parser->buffer[parser->idx] = 0; |
1638 | parser->cont = false; | |
057db848 | 1639 | } else if (parser->idx < parser->size - 1) { |
b63f39ea | 1640 | parser->cont = true; |
1641 | parser->buffer[parser->idx++] = ch; | |
f4d0706c CD |
1642 | /* Make sure the parsed string always terminates with '\0'. */ |
1643 | parser->buffer[parser->idx] = 0; | |
057db848 SR |
1644 | } else { |
1645 | ret = -EINVAL; | |
1646 | goto out; | |
b63f39ea | 1647 | } |
1648 | ||
1649 | *ppos += read; | |
1650 | ret = read; | |
1651 | ||
1652 | out: | |
1653 | return ret; | |
1654 | } | |
1655 | ||
3a161d99 | 1656 | /* TODO add a seq_buf_to_buffer() */ |
b8b94265 | 1657 | static ssize_t trace_seq_to_buffer(struct trace_seq *s, void *buf, size_t cnt) |
3c56819b EGM |
1658 | { |
1659 | int len; | |
3c56819b | 1660 | |
5ac48378 | 1661 | if (trace_seq_used(s) <= s->seq.readpos) |
3c56819b EGM |
1662 | return -EBUSY; |
1663 | ||
5ac48378 | 1664 | len = trace_seq_used(s) - s->seq.readpos; |
3c56819b EGM |
1665 | if (cnt > len) |
1666 | cnt = len; | |
3a161d99 | 1667 | memcpy(buf, s->buffer + s->seq.readpos, cnt); |
3c56819b | 1668 | |
3a161d99 | 1669 | s->seq.readpos += cnt; |
3c56819b EGM |
1670 | return cnt; |
1671 | } | |
1672 | ||
0e950173 | 1673 | unsigned long __read_mostly tracing_thresh; |
91edde2e VRB |
1674 | static const struct file_operations tracing_max_lat_fops; |
1675 | ||
1676 | #if (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)) && \ | |
1677 | defined(CONFIG_FSNOTIFY) | |
1678 | ||
1679 | static struct workqueue_struct *fsnotify_wq; | |
1680 | ||
1681 | static void latency_fsnotify_workfn(struct work_struct *work) | |
1682 | { | |
1683 | struct trace_array *tr = container_of(work, struct trace_array, | |
1684 | fsnotify_work); | |
82ace1ef | 1685 | fsnotify_inode(tr->d_max_latency->d_inode, FS_MODIFY); |
91edde2e VRB |
1686 | } |
1687 | ||
1688 | static void latency_fsnotify_workfn_irq(struct irq_work *iwork) | |
1689 | { | |
1690 | struct trace_array *tr = container_of(iwork, struct trace_array, | |
1691 | fsnotify_irqwork); | |
1692 | queue_work(fsnotify_wq, &tr->fsnotify_work); | |
1693 | } | |
1694 | ||
1695 | static void trace_create_maxlat_file(struct trace_array *tr, | |
1696 | struct dentry *d_tracer) | |
1697 | { | |
1698 | INIT_WORK(&tr->fsnotify_work, latency_fsnotify_workfn); | |
1699 | init_irq_work(&tr->fsnotify_irqwork, latency_fsnotify_workfn_irq); | |
1700 | tr->d_max_latency = trace_create_file("tracing_max_latency", 0644, | |
1701 | d_tracer, &tr->max_latency, | |
1702 | &tracing_max_lat_fops); | |
1703 | } | |
1704 | ||
1705 | __init static int latency_fsnotify_init(void) | |
1706 | { | |
1707 | fsnotify_wq = alloc_workqueue("tr_max_lat_wq", | |
1708 | WQ_UNBOUND | WQ_HIGHPRI, 0); | |
1709 | if (!fsnotify_wq) { | |
1710 | pr_err("Unable to allocate tr_max_lat_wq\n"); | |
1711 | return -ENOMEM; | |
1712 | } | |
1713 | return 0; | |
1714 | } | |
1715 | ||
1716 | late_initcall_sync(latency_fsnotify_init); | |
1717 | ||
1718 | void latency_fsnotify(struct trace_array *tr) | |
1719 | { | |
1720 | if (!fsnotify_wq) | |
1721 | return; | |
1722 | /* | |
1723 | * We cannot call queue_work(&tr->fsnotify_work) from here because it's | |
1724 | * possible that we are called from __schedule() or do_idle(), which | |
1725 | * could cause a deadlock. | |
1726 | */ | |
1727 | irq_work_queue(&tr->fsnotify_irqwork); | |
1728 | } | |
1729 | ||
1730 | /* | |
1731 | * (defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)) && \ | |
1732 | * defined(CONFIG_FSNOTIFY) | |
1733 | */ | |
1734 | #else | |
1735 | ||
1736 | #define trace_create_maxlat_file(tr, d_tracer) \ | |
1737 | trace_create_file("tracing_max_latency", 0644, d_tracer, \ | |
1738 | &tr->max_latency, &tracing_max_lat_fops) | |
1739 | ||
1740 | #endif | |
0e950173 | 1741 | |
5d4a9dba | 1742 | #ifdef CONFIG_TRACER_MAX_TRACE |
5d4a9dba SR |
1743 | /* |
1744 | * Copy the new maximum trace into the separate maximum-trace | |
1745 | * structure. (this way the maximum trace is permanently saved, | |
5a93bae2 | 1746 | * for later retrieval via /sys/kernel/tracing/tracing_max_latency) |
5d4a9dba SR |
1747 | */ |
1748 | static void | |
1749 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) | |
1750 | { | |
1c5eb448 SRV |
1751 | struct array_buffer *trace_buf = &tr->array_buffer; |
1752 | struct array_buffer *max_buf = &tr->max_buffer; | |
12883efb SRRH |
1753 | struct trace_array_cpu *data = per_cpu_ptr(trace_buf->data, cpu); |
1754 | struct trace_array_cpu *max_data = per_cpu_ptr(max_buf->data, cpu); | |
5d4a9dba | 1755 | |
12883efb SRRH |
1756 | max_buf->cpu = cpu; |
1757 | max_buf->time_start = data->preempt_timestamp; | |
5d4a9dba | 1758 | |
6d9b3fa5 | 1759 | max_data->saved_latency = tr->max_latency; |
8248ac05 SR |
1760 | max_data->critical_start = data->critical_start; |
1761 | max_data->critical_end = data->critical_end; | |
5d4a9dba | 1762 | |
85f726a3 | 1763 | strncpy(max_data->comm, tsk->comm, TASK_COMM_LEN); |
8248ac05 | 1764 | max_data->pid = tsk->pid; |
f17a5194 SRRH |
1765 | /* |
1766 | * If tsk == current, then use current_uid(), as that does not use | |
1767 | * RCU. The irq tracer can be called out of RCU scope. | |
1768 | */ | |
1769 | if (tsk == current) | |
1770 | max_data->uid = current_uid(); | |
1771 | else | |
1772 | max_data->uid = task_uid(tsk); | |
1773 | ||
8248ac05 SR |
1774 | max_data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; |
1775 | max_data->policy = tsk->policy; | |
1776 | max_data->rt_priority = tsk->rt_priority; | |
5d4a9dba SR |
1777 | |
1778 | /* record this tasks comm */ | |
1779 | tracing_record_cmdline(tsk); | |
91edde2e | 1780 | latency_fsnotify(tr); |
5d4a9dba SR |
1781 | } |
1782 | ||
4fcdae83 SR |
1783 | /** |
1784 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr | |
1785 | * @tr: tracer | |
1786 | * @tsk: the task with the latency | |
1787 | * @cpu: The cpu that initiated the trace. | |
a35873a0 | 1788 | * @cond_data: User data associated with a conditional snapshot |
4fcdae83 SR |
1789 | * |
1790 | * Flip the buffers between the @tr and the max_tr and record information | |
1791 | * about which task was the cause of this latency. | |
1792 | */ | |
e309b41d | 1793 | void |
a35873a0 TZ |
1794 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu, |
1795 | void *cond_data) | |
bc0c38d1 | 1796 | { |
2b6080f2 | 1797 | if (tr->stop_count) |
b8de7bd1 SR |
1798 | return; |
1799 | ||
4c11d7ae | 1800 | WARN_ON_ONCE(!irqs_disabled()); |
34600f0e | 1801 | |
45ad21ca | 1802 | if (!tr->allocated_snapshot) { |
debdd57f | 1803 | /* Only the nop tracer should hit this when disabling */ |
2b6080f2 | 1804 | WARN_ON_ONCE(tr->current_trace != &nop_trace); |
34600f0e | 1805 | return; |
debdd57f | 1806 | } |
34600f0e | 1807 | |
0b9b12c1 | 1808 | arch_spin_lock(&tr->max_lock); |
3928a8a2 | 1809 | |
1c5eb448 SRV |
1810 | /* Inherit the recordable setting from array_buffer */ |
1811 | if (ring_buffer_record_is_set_on(tr->array_buffer.buffer)) | |
73c8d894 MH |
1812 | ring_buffer_record_on(tr->max_buffer.buffer); |
1813 | else | |
1814 | ring_buffer_record_off(tr->max_buffer.buffer); | |
1815 | ||
a35873a0 TZ |
1816 | #ifdef CONFIG_TRACER_SNAPSHOT |
1817 | if (tr->cond_snapshot && !tr->cond_snapshot->update(tr, cond_data)) | |
1818 | goto out_unlock; | |
1819 | #endif | |
1c5eb448 | 1820 | swap(tr->array_buffer.buffer, tr->max_buffer.buffer); |
3928a8a2 | 1821 | |
bc0c38d1 | 1822 | __update_max_tr(tr, tsk, cpu); |
a35873a0 TZ |
1823 | |
1824 | out_unlock: | |
0b9b12c1 | 1825 | arch_spin_unlock(&tr->max_lock); |
bc0c38d1 SR |
1826 | } |
1827 | ||
1828 | /** | |
1829 | * update_max_tr_single - only copy one trace over, and reset the rest | |
c68c9ec1 JK |
1830 | * @tr: tracer |
1831 | * @tsk: task with the latency | |
1832 | * @cpu: the cpu of the buffer to copy. | |
4fcdae83 SR |
1833 | * |
1834 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. | |
bc0c38d1 | 1835 | */ |
e309b41d | 1836 | void |
bc0c38d1 SR |
1837 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
1838 | { | |
3928a8a2 | 1839 | int ret; |
bc0c38d1 | 1840 | |
2b6080f2 | 1841 | if (tr->stop_count) |
b8de7bd1 SR |
1842 | return; |
1843 | ||
4c11d7ae | 1844 | WARN_ON_ONCE(!irqs_disabled()); |
6c24499f | 1845 | if (!tr->allocated_snapshot) { |
2930e04d | 1846 | /* Only the nop tracer should hit this when disabling */ |
9e8529af | 1847 | WARN_ON_ONCE(tr->current_trace != &nop_trace); |
ef710e10 | 1848 | return; |
2930e04d | 1849 | } |
ef710e10 | 1850 | |
0b9b12c1 | 1851 | arch_spin_lock(&tr->max_lock); |
bc0c38d1 | 1852 | |
1c5eb448 | 1853 | ret = ring_buffer_swap_cpu(tr->max_buffer.buffer, tr->array_buffer.buffer, cpu); |
3928a8a2 | 1854 | |
e8165dbb SR |
1855 | if (ret == -EBUSY) { |
1856 | /* | |
1857 | * We failed to swap the buffer due to a commit taking | |
1858 | * place on this CPU. We fail to record, but we reset | |
1859 | * the max trace buffer (no one writes directly to it) | |
1860 | * and flag that it failed. | |
1861 | */ | |
12883efb | 1862 | trace_array_printk_buf(tr->max_buffer.buffer, _THIS_IP_, |
e8165dbb SR |
1863 | "Failed to swap buffers due to commit in progress\n"); |
1864 | } | |
1865 | ||
e8165dbb | 1866 | WARN_ON_ONCE(ret && ret != -EAGAIN && ret != -EBUSY); |
bc0c38d1 SR |
1867 | |
1868 | __update_max_tr(tr, tsk, cpu); | |
0b9b12c1 | 1869 | arch_spin_unlock(&tr->max_lock); |
bc0c38d1 | 1870 | } |
5d4a9dba | 1871 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
bc0c38d1 | 1872 | |
2c2b0a78 | 1873 | static int wait_on_pipe(struct trace_iterator *iter, int full) |
0d5c6e1c | 1874 | { |
15693458 SRRH |
1875 | /* Iterators are static, they should be filled or empty */ |
1876 | if (trace_buffer_iter(iter, iter->cpu_file)) | |
8b8b3683 | 1877 | return 0; |
0d5c6e1c | 1878 | |
1c5eb448 | 1879 | return ring_buffer_wait(iter->array_buffer->buffer, iter->cpu_file, |
e30f53aa | 1880 | full); |
0d5c6e1c SR |
1881 | } |
1882 | ||
f4e781c0 | 1883 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
9afecfbb SRV |
1884 | static bool selftests_can_run; |
1885 | ||
1886 | struct trace_selftests { | |
1887 | struct list_head list; | |
1888 | struct tracer *type; | |
1889 | }; | |
1890 | ||
1891 | static LIST_HEAD(postponed_selftests); | |
1892 | ||
1893 | static int save_selftest(struct tracer *type) | |
1894 | { | |
1895 | struct trace_selftests *selftest; | |
1896 | ||
1897 | selftest = kmalloc(sizeof(*selftest), GFP_KERNEL); | |
1898 | if (!selftest) | |
1899 | return -ENOMEM; | |
1900 | ||
1901 | selftest->type = type; | |
1902 | list_add(&selftest->list, &postponed_selftests); | |
1903 | return 0; | |
1904 | } | |
1905 | ||
f4e781c0 SRRH |
1906 | static int run_tracer_selftest(struct tracer *type) |
1907 | { | |
1908 | struct trace_array *tr = &global_trace; | |
1909 | struct tracer *saved_tracer = tr->current_trace; | |
1910 | int ret; | |
0d5c6e1c | 1911 | |
f4e781c0 SRRH |
1912 | if (!type->selftest || tracing_selftest_disabled) |
1913 | return 0; | |
0d5c6e1c | 1914 | |
9afecfbb SRV |
1915 | /* |
1916 | * If a tracer registers early in boot up (before scheduling is | |
1917 | * initialized and such), then do not run its selftests yet. | |
1918 | * Instead, run it a little later in the boot process. | |
1919 | */ | |
1920 | if (!selftests_can_run) | |
1921 | return save_selftest(type); | |
1922 | ||
0d5c6e1c | 1923 | /* |
f4e781c0 SRRH |
1924 | * Run a selftest on this tracer. |
1925 | * Here we reset the trace buffer, and set the current | |
1926 | * tracer to be this tracer. The tracer can then run some | |
1927 | * internal tracing to verify that everything is in order. | |
1928 | * If we fail, we do not register this tracer. | |
0d5c6e1c | 1929 | */ |
1c5eb448 | 1930 | tracing_reset_online_cpus(&tr->array_buffer); |
0d5c6e1c | 1931 | |
f4e781c0 SRRH |
1932 | tr->current_trace = type; |
1933 | ||
1934 | #ifdef CONFIG_TRACER_MAX_TRACE | |
1935 | if (type->use_max_tr) { | |
1936 | /* If we expanded the buffers, make sure the max is expanded too */ | |
1937 | if (ring_buffer_expanded) | |
1938 | ring_buffer_resize(tr->max_buffer.buffer, trace_buf_size, | |
1939 | RING_BUFFER_ALL_CPUS); | |
1940 | tr->allocated_snapshot = true; | |
1941 | } | |
1942 | #endif | |
1943 | ||
1944 | /* the test is responsible for initializing and enabling */ | |
1945 | pr_info("Testing tracer %s: ", type->name); | |
1946 | ret = type->selftest(type, tr); | |
1947 | /* the test is responsible for resetting too */ | |
1948 | tr->current_trace = saved_tracer; | |
1949 | if (ret) { | |
1950 | printk(KERN_CONT "FAILED!\n"); | |
1951 | /* Add the warning after printing 'FAILED' */ | |
1952 | WARN_ON(1); | |
1953 | return -1; | |
1954 | } | |
1955 | /* Only reset on passing, to avoid touching corrupted buffers */ | |
1c5eb448 | 1956 | tracing_reset_online_cpus(&tr->array_buffer); |
f4e781c0 SRRH |
1957 | |
1958 | #ifdef CONFIG_TRACER_MAX_TRACE | |
1959 | if (type->use_max_tr) { | |
1960 | tr->allocated_snapshot = false; | |
0d5c6e1c | 1961 | |
f4e781c0 SRRH |
1962 | /* Shrink the max buffer again */ |
1963 | if (ring_buffer_expanded) | |
1964 | ring_buffer_resize(tr->max_buffer.buffer, 1, | |
1965 | RING_BUFFER_ALL_CPUS); | |
1966 | } | |
1967 | #endif | |
1968 | ||
1969 | printk(KERN_CONT "PASSED\n"); | |
1970 | return 0; | |
1971 | } | |
9afecfbb SRV |
1972 | |
1973 | static __init int init_trace_selftests(void) | |
1974 | { | |
1975 | struct trace_selftests *p, *n; | |
1976 | struct tracer *t, **last; | |
1977 | int ret; | |
1978 | ||
1979 | selftests_can_run = true; | |
1980 | ||
1981 | mutex_lock(&trace_types_lock); | |
1982 | ||
1983 | if (list_empty(&postponed_selftests)) | |
1984 | goto out; | |
1985 | ||
1986 | pr_info("Running postponed tracer tests:\n"); | |
1987 | ||
78041c0c | 1988 | tracing_selftest_running = true; |
9afecfbb | 1989 | list_for_each_entry_safe(p, n, &postponed_selftests, list) { |
6fc2171c AR |
1990 | /* This loop can take minutes when sanitizers are enabled, so |
1991 | * lets make sure we allow RCU processing. | |
1992 | */ | |
1993 | cond_resched(); | |
9afecfbb SRV |
1994 | ret = run_tracer_selftest(p->type); |
1995 | /* If the test fails, then warn and remove from available_tracers */ | |
1996 | if (ret < 0) { | |
1997 | WARN(1, "tracer: %s failed selftest, disabling\n", | |
1998 | p->type->name); | |
1999 | last = &trace_types; | |
2000 | for (t = trace_types; t; t = t->next) { | |
2001 | if (t == p->type) { | |
2002 | *last = t->next; | |
2003 | break; | |
2004 | } | |
2005 | last = &t->next; | |
2006 | } | |
2007 | } | |
2008 | list_del(&p->list); | |
2009 | kfree(p); | |
2010 | } | |
78041c0c | 2011 | tracing_selftest_running = false; |
9afecfbb SRV |
2012 | |
2013 | out: | |
2014 | mutex_unlock(&trace_types_lock); | |
2015 | ||
2016 | return 0; | |
2017 | } | |
b9ef0326 | 2018 | core_initcall(init_trace_selftests); |
f4e781c0 SRRH |
2019 | #else |
2020 | static inline int run_tracer_selftest(struct tracer *type) | |
2021 | { | |
2022 | return 0; | |
0d5c6e1c | 2023 | } |
f4e781c0 | 2024 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |
0d5c6e1c | 2025 | |
41d9c0be SRRH |
2026 | static void add_tracer_options(struct trace_array *tr, struct tracer *t); |
2027 | ||
a4d1e688 JW |
2028 | static void __init apply_trace_boot_options(void); |
2029 | ||
4fcdae83 SR |
2030 | /** |
2031 | * register_tracer - register a tracer with the ftrace system. | |
c68c9ec1 | 2032 | * @type: the plugin for the tracer |
4fcdae83 SR |
2033 | * |
2034 | * Register a new plugin tracer. | |
2035 | */ | |
a4d1e688 | 2036 | int __init register_tracer(struct tracer *type) |
bc0c38d1 SR |
2037 | { |
2038 | struct tracer *t; | |
bc0c38d1 SR |
2039 | int ret = 0; |
2040 | ||
2041 | if (!type->name) { | |
2042 | pr_info("Tracer must have a name\n"); | |
2043 | return -1; | |
2044 | } | |
2045 | ||
24a461d5 | 2046 | if (strlen(type->name) >= MAX_TRACER_SIZE) { |
ee6c2c1b LZ |
2047 | pr_info("Tracer has a name longer than %d\n", MAX_TRACER_SIZE); |
2048 | return -1; | |
2049 | } | |
2050 | ||
a356646a | 2051 | if (security_locked_down(LOCKDOWN_TRACEFS)) { |
ee195452 | 2052 | pr_warn("Can not register tracer %s due to lockdown\n", |
a356646a SRV |
2053 | type->name); |
2054 | return -EPERM; | |
2055 | } | |
2056 | ||
bc0c38d1 | 2057 | mutex_lock(&trace_types_lock); |
86fa2f60 | 2058 | |
8e1b82e0 FW |
2059 | tracing_selftest_running = true; |
2060 | ||
bc0c38d1 SR |
2061 | for (t = trace_types; t; t = t->next) { |
2062 | if (strcmp(type->name, t->name) == 0) { | |
2063 | /* already found */ | |
ee6c2c1b | 2064 | pr_info("Tracer %s already registered\n", |
bc0c38d1 SR |
2065 | type->name); |
2066 | ret = -1; | |
2067 | goto out; | |
2068 | } | |
2069 | } | |
2070 | ||
adf9f195 FW |
2071 | if (!type->set_flag) |
2072 | type->set_flag = &dummy_set_flag; | |
d39cdd20 CH |
2073 | if (!type->flags) { |
2074 | /*allocate a dummy tracer_flags*/ | |
2075 | type->flags = kmalloc(sizeof(*type->flags), GFP_KERNEL); | |
c8ca003b CH |
2076 | if (!type->flags) { |
2077 | ret = -ENOMEM; | |
2078 | goto out; | |
2079 | } | |
d39cdd20 CH |
2080 | type->flags->val = 0; |
2081 | type->flags->opts = dummy_tracer_opt; | |
2082 | } else | |
adf9f195 FW |
2083 | if (!type->flags->opts) |
2084 | type->flags->opts = dummy_tracer_opt; | |
6eaaa5d5 | 2085 | |
d39cdd20 CH |
2086 | /* store the tracer for __set_tracer_option */ |
2087 | type->flags->trace = type; | |
2088 | ||
f4e781c0 SRRH |
2089 | ret = run_tracer_selftest(type); |
2090 | if (ret < 0) | |
2091 | goto out; | |
60a11774 | 2092 | |
bc0c38d1 SR |
2093 | type->next = trace_types; |
2094 | trace_types = type; | |
41d9c0be | 2095 | add_tracer_options(&global_trace, type); |
60a11774 | 2096 | |
bc0c38d1 | 2097 | out: |
8e1b82e0 | 2098 | tracing_selftest_running = false; |
bc0c38d1 SR |
2099 | mutex_unlock(&trace_types_lock); |
2100 | ||
dac74940 SR |
2101 | if (ret || !default_bootup_tracer) |
2102 | goto out_unlock; | |
2103 | ||
ee6c2c1b | 2104 | if (strncmp(default_bootup_tracer, type->name, MAX_TRACER_SIZE)) |
dac74940 SR |
2105 | goto out_unlock; |
2106 | ||
2107 | printk(KERN_INFO "Starting tracer '%s'\n", type->name); | |
2108 | /* Do we want this tracer to start on bootup? */ | |
607e2ea1 | 2109 | tracing_set_tracer(&global_trace, type->name); |
dac74940 | 2110 | default_bootup_tracer = NULL; |
a4d1e688 JW |
2111 | |
2112 | apply_trace_boot_options(); | |
2113 | ||
dac74940 | 2114 | /* disable other selftests, since this will break it. */ |
55034cd6 | 2115 | tracing_selftest_disabled = true; |
b2821ae6 | 2116 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
dac74940 SR |
2117 | printk(KERN_INFO "Disabling FTRACE selftests due to running tracer '%s'\n", |
2118 | type->name); | |
b2821ae6 | 2119 | #endif |
b2821ae6 | 2120 | |
dac74940 | 2121 | out_unlock: |
bc0c38d1 SR |
2122 | return ret; |
2123 | } | |
2124 | ||
1c5eb448 | 2125 | static void tracing_reset_cpu(struct array_buffer *buf, int cpu) |
f633903a | 2126 | { |
13292494 | 2127 | struct trace_buffer *buffer = buf->buffer; |
f633903a | 2128 | |
a5416411 HT |
2129 | if (!buffer) |
2130 | return; | |
2131 | ||
f633903a SR |
2132 | ring_buffer_record_disable(buffer); |
2133 | ||
2134 | /* Make sure all commits have finished */ | |
74401729 | 2135 | synchronize_rcu(); |
68179686 | 2136 | ring_buffer_reset_cpu(buffer, cpu); |
f633903a SR |
2137 | |
2138 | ring_buffer_record_enable(buffer); | |
2139 | } | |
2140 | ||
1c5eb448 | 2141 | void tracing_reset_online_cpus(struct array_buffer *buf) |
213cc060 | 2142 | { |
13292494 | 2143 | struct trace_buffer *buffer = buf->buffer; |
213cc060 | 2144 | |
a5416411 HT |
2145 | if (!buffer) |
2146 | return; | |
2147 | ||
621968cd SR |
2148 | ring_buffer_record_disable(buffer); |
2149 | ||
2150 | /* Make sure all commits have finished */ | |
74401729 | 2151 | synchronize_rcu(); |
621968cd | 2152 | |
9457158b | 2153 | buf->time_start = buffer_ftrace_now(buf, buf->cpu); |
213cc060 | 2154 | |
b23d7a5f | 2155 | ring_buffer_reset_online_cpus(buffer); |
621968cd SR |
2156 | |
2157 | ring_buffer_record_enable(buffer); | |
213cc060 PE |
2158 | } |
2159 | ||
09d8091c | 2160 | /* Must have trace_types_lock held */ |
873c642f | 2161 | void tracing_reset_all_online_cpus(void) |
9456f0fa | 2162 | { |
873c642f SRRH |
2163 | struct trace_array *tr; |
2164 | ||
873c642f | 2165 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
065e63f9 SRV |
2166 | if (!tr->clear_trace) |
2167 | continue; | |
2168 | tr->clear_trace = false; | |
1c5eb448 | 2169 | tracing_reset_online_cpus(&tr->array_buffer); |
12883efb SRRH |
2170 | #ifdef CONFIG_TRACER_MAX_TRACE |
2171 | tracing_reset_online_cpus(&tr->max_buffer); | |
2172 | #endif | |
873c642f | 2173 | } |
9456f0fa SR |
2174 | } |
2175 | ||
d914ba37 JF |
2176 | static int *tgid_map; |
2177 | ||
939c7a4f | 2178 | #define SAVED_CMDLINES_DEFAULT 128 |
2c7eea4c | 2179 | #define NO_CMDLINE_MAP UINT_MAX |
edc35bd7 | 2180 | static arch_spinlock_t trace_cmdline_lock = __ARCH_SPIN_LOCK_UNLOCKED; |
939c7a4f YY |
2181 | struct saved_cmdlines_buffer { |
2182 | unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; | |
2183 | unsigned *map_cmdline_to_pid; | |
2184 | unsigned cmdline_num; | |
2185 | int cmdline_idx; | |
2186 | char *saved_cmdlines; | |
2187 | }; | |
2188 | static struct saved_cmdlines_buffer *savedcmd; | |
25b0b44a | 2189 | |
25b0b44a | 2190 | /* temporary disable recording */ |
d914ba37 | 2191 | static atomic_t trace_record_taskinfo_disabled __read_mostly; |
bc0c38d1 | 2192 | |
939c7a4f YY |
2193 | static inline char *get_saved_cmdlines(int idx) |
2194 | { | |
2195 | return &savedcmd->saved_cmdlines[idx * TASK_COMM_LEN]; | |
2196 | } | |
2197 | ||
2198 | static inline void set_cmdline(int idx, const char *cmdline) | |
bc0c38d1 | 2199 | { |
85f726a3 | 2200 | strncpy(get_saved_cmdlines(idx), cmdline, TASK_COMM_LEN); |
939c7a4f YY |
2201 | } |
2202 | ||
2203 | static int allocate_cmdlines_buffer(unsigned int val, | |
2204 | struct saved_cmdlines_buffer *s) | |
2205 | { | |
6da2ec56 KC |
2206 | s->map_cmdline_to_pid = kmalloc_array(val, |
2207 | sizeof(*s->map_cmdline_to_pid), | |
2208 | GFP_KERNEL); | |
939c7a4f YY |
2209 | if (!s->map_cmdline_to_pid) |
2210 | return -ENOMEM; | |
2211 | ||
6da2ec56 | 2212 | s->saved_cmdlines = kmalloc_array(TASK_COMM_LEN, val, GFP_KERNEL); |
939c7a4f YY |
2213 | if (!s->saved_cmdlines) { |
2214 | kfree(s->map_cmdline_to_pid); | |
2215 | return -ENOMEM; | |
2216 | } | |
2217 | ||
2218 | s->cmdline_idx = 0; | |
2219 | s->cmdline_num = val; | |
2220 | memset(&s->map_pid_to_cmdline, NO_CMDLINE_MAP, | |
2221 | sizeof(s->map_pid_to_cmdline)); | |
2222 | memset(s->map_cmdline_to_pid, NO_CMDLINE_MAP, | |
2223 | val * sizeof(*s->map_cmdline_to_pid)); | |
2224 | ||
2225 | return 0; | |
2226 | } | |
2227 | ||
2228 | static int trace_create_savedcmd(void) | |
2229 | { | |
2230 | int ret; | |
2231 | ||
a6af8fbf | 2232 | savedcmd = kmalloc(sizeof(*savedcmd), GFP_KERNEL); |
939c7a4f YY |
2233 | if (!savedcmd) |
2234 | return -ENOMEM; | |
2235 | ||
2236 | ret = allocate_cmdlines_buffer(SAVED_CMDLINES_DEFAULT, savedcmd); | |
2237 | if (ret < 0) { | |
2238 | kfree(savedcmd); | |
2239 | savedcmd = NULL; | |
2240 | return -ENOMEM; | |
2241 | } | |
2242 | ||
2243 | return 0; | |
bc0c38d1 SR |
2244 | } |
2245 | ||
b5130b1e CE |
2246 | int is_tracing_stopped(void) |
2247 | { | |
2b6080f2 | 2248 | return global_trace.stop_count; |
b5130b1e CE |
2249 | } |
2250 | ||
0f048701 SR |
2251 | /** |
2252 | * tracing_start - quick start of the tracer | |
2253 | * | |
2254 | * If tracing is enabled but was stopped by tracing_stop, | |
2255 | * this will start the tracer back up. | |
2256 | */ | |
2257 | void tracing_start(void) | |
2258 | { | |
13292494 | 2259 | struct trace_buffer *buffer; |
0f048701 SR |
2260 | unsigned long flags; |
2261 | ||
2262 | if (tracing_disabled) | |
2263 | return; | |
2264 | ||
2b6080f2 SR |
2265 | raw_spin_lock_irqsave(&global_trace.start_lock, flags); |
2266 | if (--global_trace.stop_count) { | |
2267 | if (global_trace.stop_count < 0) { | |
b06a8301 SR |
2268 | /* Someone screwed up their debugging */ |
2269 | WARN_ON_ONCE(1); | |
2b6080f2 | 2270 | global_trace.stop_count = 0; |
b06a8301 | 2271 | } |
0f048701 SR |
2272 | goto out; |
2273 | } | |
2274 | ||
a2f80714 | 2275 | /* Prevent the buffers from switching */ |
0b9b12c1 | 2276 | arch_spin_lock(&global_trace.max_lock); |
0f048701 | 2277 | |
1c5eb448 | 2278 | buffer = global_trace.array_buffer.buffer; |
0f048701 SR |
2279 | if (buffer) |
2280 | ring_buffer_record_enable(buffer); | |
2281 | ||
12883efb SRRH |
2282 | #ifdef CONFIG_TRACER_MAX_TRACE |
2283 | buffer = global_trace.max_buffer.buffer; | |
0f048701 SR |
2284 | if (buffer) |
2285 | ring_buffer_record_enable(buffer); | |
12883efb | 2286 | #endif |
0f048701 | 2287 | |
0b9b12c1 | 2288 | arch_spin_unlock(&global_trace.max_lock); |
a2f80714 | 2289 | |
0f048701 | 2290 | out: |
2b6080f2 SR |
2291 | raw_spin_unlock_irqrestore(&global_trace.start_lock, flags); |
2292 | } | |
2293 | ||
2294 | static void tracing_start_tr(struct trace_array *tr) | |
2295 | { | |
13292494 | 2296 | struct trace_buffer *buffer; |
2b6080f2 SR |
2297 | unsigned long flags; |
2298 | ||
2299 | if (tracing_disabled) | |
2300 | return; | |
2301 | ||
2302 | /* If global, we need to also start the max tracer */ | |
2303 | if (tr->flags & TRACE_ARRAY_FL_GLOBAL) | |
2304 | return tracing_start(); | |
2305 | ||
2306 | raw_spin_lock_irqsave(&tr->start_lock, flags); | |
2307 | ||
2308 | if (--tr->stop_count) { | |
2309 | if (tr->stop_count < 0) { | |
2310 | /* Someone screwed up their debugging */ | |
2311 | WARN_ON_ONCE(1); | |
2312 | tr->stop_count = 0; | |
2313 | } | |
2314 | goto out; | |
2315 | } | |
2316 | ||
1c5eb448 | 2317 | buffer = tr->array_buffer.buffer; |
2b6080f2 SR |
2318 | if (buffer) |
2319 | ring_buffer_record_enable(buffer); | |
2320 | ||
2321 | out: | |
2322 | raw_spin_unlock_irqrestore(&tr->start_lock, flags); | |
0f048701 SR |
2323 | } |
2324 | ||
2325 | /** | |
2326 | * tracing_stop - quick stop of the tracer | |
2327 | * | |
2328 | * Light weight way to stop tracing. Use in conjunction with | |
2329 | * tracing_start. | |
2330 | */ | |
2331 | void tracing_stop(void) | |
2332 | { | |
13292494 | 2333 | struct trace_buffer *buffer; |
0f048701 SR |
2334 | unsigned long flags; |
2335 | ||
2b6080f2 SR |
2336 | raw_spin_lock_irqsave(&global_trace.start_lock, flags); |
2337 | if (global_trace.stop_count++) | |
0f048701 SR |
2338 | goto out; |
2339 | ||
a2f80714 | 2340 | /* Prevent the buffers from switching */ |
0b9b12c1 | 2341 | arch_spin_lock(&global_trace.max_lock); |
a2f80714 | 2342 | |
1c5eb448 | 2343 | buffer = global_trace.array_buffer.buffer; |
0f048701 SR |
2344 | if (buffer) |
2345 | ring_buffer_record_disable(buffer); | |
2346 | ||
12883efb SRRH |
2347 | #ifdef CONFIG_TRACER_MAX_TRACE |
2348 | buffer = global_trace.max_buffer.buffer; | |
0f048701 SR |
2349 | if (buffer) |
2350 | ring_buffer_record_disable(buffer); | |
12883efb | 2351 | #endif |
0f048701 | 2352 | |
0b9b12c1 | 2353 | arch_spin_unlock(&global_trace.max_lock); |
a2f80714 | 2354 | |
0f048701 | 2355 | out: |
2b6080f2 SR |
2356 | raw_spin_unlock_irqrestore(&global_trace.start_lock, flags); |
2357 | } | |
2358 | ||
2359 | static void tracing_stop_tr(struct trace_array *tr) | |
2360 | { | |
13292494 | 2361 | struct trace_buffer *buffer; |
2b6080f2 SR |
2362 | unsigned long flags; |
2363 | ||
2364 | /* If global, we need to also stop the max tracer */ | |
2365 | if (tr->flags & TRACE_ARRAY_FL_GLOBAL) | |
2366 | return tracing_stop(); | |
2367 | ||
2368 | raw_spin_lock_irqsave(&tr->start_lock, flags); | |
2369 | if (tr->stop_count++) | |
2370 | goto out; | |
2371 | ||
1c5eb448 | 2372 | buffer = tr->array_buffer.buffer; |
2b6080f2 SR |
2373 | if (buffer) |
2374 | ring_buffer_record_disable(buffer); | |
2375 | ||
2376 | out: | |
2377 | raw_spin_unlock_irqrestore(&tr->start_lock, flags); | |
0f048701 SR |
2378 | } |
2379 | ||
379cfdac | 2380 | static int trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 | 2381 | { |
a635cf04 | 2382 | unsigned pid, idx; |
bc0c38d1 | 2383 | |
eaf260ac JF |
2384 | /* treat recording of idle task as a success */ |
2385 | if (!tsk->pid) | |
2386 | return 1; | |
2387 | ||
2388 | if (unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
379cfdac | 2389 | return 0; |
bc0c38d1 SR |
2390 | |
2391 | /* | |
2392 | * It's not the end of the world if we don't get | |
2393 | * the lock, but we also don't want to spin | |
2394 | * nor do we want to disable interrupts, | |
2395 | * so if we miss here, then better luck next time. | |
2396 | */ | |
0199c4e6 | 2397 | if (!arch_spin_trylock(&trace_cmdline_lock)) |
379cfdac | 2398 | return 0; |
bc0c38d1 | 2399 | |
939c7a4f | 2400 | idx = savedcmd->map_pid_to_cmdline[tsk->pid]; |
2c7eea4c | 2401 | if (idx == NO_CMDLINE_MAP) { |
939c7a4f | 2402 | idx = (savedcmd->cmdline_idx + 1) % savedcmd->cmdline_num; |
bc0c38d1 | 2403 | |
a635cf04 CE |
2404 | /* |
2405 | * Check whether the cmdline buffer at idx has a pid | |
2406 | * mapped. We are going to overwrite that entry so we | |
2407 | * need to clear the map_pid_to_cmdline. Otherwise we | |
2408 | * would read the new comm for the old pid. | |
2409 | */ | |
939c7a4f | 2410 | pid = savedcmd->map_cmdline_to_pid[idx]; |
a635cf04 | 2411 | if (pid != NO_CMDLINE_MAP) |
939c7a4f | 2412 | savedcmd->map_pid_to_cmdline[pid] = NO_CMDLINE_MAP; |
bc0c38d1 | 2413 | |
939c7a4f YY |
2414 | savedcmd->map_cmdline_to_pid[idx] = tsk->pid; |
2415 | savedcmd->map_pid_to_cmdline[tsk->pid] = idx; | |
bc0c38d1 | 2416 | |
939c7a4f | 2417 | savedcmd->cmdline_idx = idx; |
bc0c38d1 SR |
2418 | } |
2419 | ||
939c7a4f | 2420 | set_cmdline(idx, tsk->comm); |
bc0c38d1 | 2421 | |
0199c4e6 | 2422 | arch_spin_unlock(&trace_cmdline_lock); |
379cfdac SRRH |
2423 | |
2424 | return 1; | |
bc0c38d1 SR |
2425 | } |
2426 | ||
4c27e756 | 2427 | static void __trace_find_cmdline(int pid, char comm[]) |
bc0c38d1 | 2428 | { |
bc0c38d1 SR |
2429 | unsigned map; |
2430 | ||
4ca53085 SR |
2431 | if (!pid) { |
2432 | strcpy(comm, "<idle>"); | |
2433 | return; | |
2434 | } | |
bc0c38d1 | 2435 | |
74bf4076 SR |
2436 | if (WARN_ON_ONCE(pid < 0)) { |
2437 | strcpy(comm, "<XXX>"); | |
2438 | return; | |
2439 | } | |
2440 | ||
4ca53085 SR |
2441 | if (pid > PID_MAX_DEFAULT) { |
2442 | strcpy(comm, "<...>"); | |
2443 | return; | |
2444 | } | |
bc0c38d1 | 2445 | |
939c7a4f | 2446 | map = savedcmd->map_pid_to_cmdline[pid]; |
50d88758 | 2447 | if (map != NO_CMDLINE_MAP) |
e09e2867 | 2448 | strlcpy(comm, get_saved_cmdlines(map), TASK_COMM_LEN); |
50d88758 TG |
2449 | else |
2450 | strcpy(comm, "<...>"); | |
4c27e756 SRRH |
2451 | } |
2452 | ||
2453 | void trace_find_cmdline(int pid, char comm[]) | |
2454 | { | |
2455 | preempt_disable(); | |
2456 | arch_spin_lock(&trace_cmdline_lock); | |
2457 | ||
2458 | __trace_find_cmdline(pid, comm); | |
bc0c38d1 | 2459 | |
0199c4e6 | 2460 | arch_spin_unlock(&trace_cmdline_lock); |
5b6045a9 | 2461 | preempt_enable(); |
bc0c38d1 SR |
2462 | } |
2463 | ||
d914ba37 JF |
2464 | int trace_find_tgid(int pid) |
2465 | { | |
2466 | if (unlikely(!tgid_map || !pid || pid > PID_MAX_DEFAULT)) | |
2467 | return 0; | |
2468 | ||
2469 | return tgid_map[pid]; | |
2470 | } | |
2471 | ||
2472 | static int trace_save_tgid(struct task_struct *tsk) | |
2473 | { | |
bd45d34d JF |
2474 | /* treat recording of idle task as a success */ |
2475 | if (!tsk->pid) | |
2476 | return 1; | |
2477 | ||
2478 | if (unlikely(!tgid_map || tsk->pid > PID_MAX_DEFAULT)) | |
d914ba37 JF |
2479 | return 0; |
2480 | ||
2481 | tgid_map[tsk->pid] = tsk->tgid; | |
2482 | return 1; | |
2483 | } | |
2484 | ||
2485 | static bool tracing_record_taskinfo_skip(int flags) | |
2486 | { | |
2487 | if (unlikely(!(flags & (TRACE_RECORD_CMDLINE | TRACE_RECORD_TGID)))) | |
2488 | return true; | |
2489 | if (atomic_read(&trace_record_taskinfo_disabled) || !tracing_is_on()) | |
2490 | return true; | |
2491 | if (!__this_cpu_read(trace_taskinfo_save)) | |
2492 | return true; | |
2493 | return false; | |
2494 | } | |
2495 | ||
2496 | /** | |
2497 | * tracing_record_taskinfo - record the task info of a task | |
2498 | * | |
c68c9ec1 JK |
2499 | * @task: task to record |
2500 | * @flags: TRACE_RECORD_CMDLINE for recording comm | |
2501 | * TRACE_RECORD_TGID for recording tgid | |
d914ba37 JF |
2502 | */ |
2503 | void tracing_record_taskinfo(struct task_struct *task, int flags) | |
2504 | { | |
29b1a8ad JF |
2505 | bool done; |
2506 | ||
d914ba37 JF |
2507 | if (tracing_record_taskinfo_skip(flags)) |
2508 | return; | |
29b1a8ad JF |
2509 | |
2510 | /* | |
2511 | * Record as much task information as possible. If some fail, continue | |
2512 | * to try to record the others. | |
2513 | */ | |
2514 | done = !(flags & TRACE_RECORD_CMDLINE) || trace_save_cmdline(task); | |
2515 | done &= !(flags & TRACE_RECORD_TGID) || trace_save_tgid(task); | |
2516 | ||
2517 | /* If recording any information failed, retry again soon. */ | |
2518 | if (!done) | |
d914ba37 JF |
2519 | return; |
2520 | ||
2521 | __this_cpu_write(trace_taskinfo_save, false); | |
2522 | } | |
2523 | ||
2524 | /** | |
2525 | * tracing_record_taskinfo_sched_switch - record task info for sched_switch | |
2526 | * | |
c68c9ec1 JK |
2527 | * @prev: previous task during sched_switch |
2528 | * @next: next task during sched_switch | |
2529 | * @flags: TRACE_RECORD_CMDLINE for recording comm | |
2530 | * TRACE_RECORD_TGID for recording tgid | |
d914ba37 JF |
2531 | */ |
2532 | void tracing_record_taskinfo_sched_switch(struct task_struct *prev, | |
2533 | struct task_struct *next, int flags) | |
bc0c38d1 | 2534 | { |
29b1a8ad JF |
2535 | bool done; |
2536 | ||
d914ba37 JF |
2537 | if (tracing_record_taskinfo_skip(flags)) |
2538 | return; | |
2539 | ||
29b1a8ad JF |
2540 | /* |
2541 | * Record as much task information as possible. If some fail, continue | |
2542 | * to try to record the others. | |
2543 | */ | |
2544 | done = !(flags & TRACE_RECORD_CMDLINE) || trace_save_cmdline(prev); | |
2545 | done &= !(flags & TRACE_RECORD_CMDLINE) || trace_save_cmdline(next); | |
2546 | done &= !(flags & TRACE_RECORD_TGID) || trace_save_tgid(prev); | |
2547 | done &= !(flags & TRACE_RECORD_TGID) || trace_save_tgid(next); | |
bc0c38d1 | 2548 | |
29b1a8ad JF |
2549 | /* If recording any information failed, retry again soon. */ |
2550 | if (!done) | |
7ffbd48d SR |
2551 | return; |
2552 | ||
d914ba37 JF |
2553 | __this_cpu_write(trace_taskinfo_save, false); |
2554 | } | |
2555 | ||
2556 | /* Helpers to record a specific task information */ | |
2557 | void tracing_record_cmdline(struct task_struct *task) | |
2558 | { | |
2559 | tracing_record_taskinfo(task, TRACE_RECORD_CMDLINE); | |
2560 | } | |
2561 | ||
2562 | void tracing_record_tgid(struct task_struct *task) | |
2563 | { | |
2564 | tracing_record_taskinfo(task, TRACE_RECORD_TGID); | |
bc0c38d1 SR |
2565 | } |
2566 | ||
af0009fc SRV |
2567 | /* |
2568 | * Several functions return TRACE_TYPE_PARTIAL_LINE if the trace_seq | |
2569 | * overflowed, and TRACE_TYPE_HANDLED otherwise. This helper function | |
2570 | * simplifies those functions and keeps them in sync. | |
2571 | */ | |
2572 | enum print_line_t trace_handle_return(struct trace_seq *s) | |
2573 | { | |
2574 | return trace_seq_has_overflowed(s) ? | |
2575 | TRACE_TYPE_PARTIAL_LINE : TRACE_TYPE_HANDLED; | |
2576 | } | |
2577 | EXPORT_SYMBOL_GPL(trace_handle_return); | |
2578 | ||
45dcd8b8 | 2579 | void |
46710f3a CW |
2580 | tracing_generic_entry_update(struct trace_entry *entry, unsigned short type, |
2581 | unsigned long flags, int pc) | |
bc0c38d1 SR |
2582 | { |
2583 | struct task_struct *tsk = current; | |
bc0c38d1 | 2584 | |
777e208d SR |
2585 | entry->preempt_count = pc & 0xff; |
2586 | entry->pid = (tsk) ? tsk->pid : 0; | |
46710f3a | 2587 | entry->type = type; |
777e208d | 2588 | entry->flags = |
9244489a | 2589 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT |
2e2ca155 | 2590 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
9244489a SR |
2591 | #else |
2592 | TRACE_FLAG_IRQS_NOSUPPORT | | |
2593 | #endif | |
7e6867bf | 2594 | ((pc & NMI_MASK ) ? TRACE_FLAG_NMI : 0) | |
bc0c38d1 | 2595 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
c59f29cb | 2596 | ((pc & SOFTIRQ_OFFSET) ? TRACE_FLAG_SOFTIRQ : 0) | |
e5137b50 PZ |
2597 | (tif_need_resched() ? TRACE_FLAG_NEED_RESCHED : 0) | |
2598 | (test_preempt_need_resched() ? TRACE_FLAG_PREEMPT_RESCHED : 0); | |
bc0c38d1 | 2599 | } |
f413cdb8 | 2600 | EXPORT_SYMBOL_GPL(tracing_generic_entry_update); |
bc0c38d1 | 2601 | |
e77405ad | 2602 | struct ring_buffer_event * |
13292494 | 2603 | trace_buffer_lock_reserve(struct trace_buffer *buffer, |
e77405ad SR |
2604 | int type, |
2605 | unsigned long len, | |
2606 | unsigned long flags, int pc) | |
51a763dd | 2607 | { |
3e9a8aad | 2608 | return __trace_buffer_lock_reserve(buffer, type, len, flags, pc); |
0fc1b09f SRRH |
2609 | } |
2610 | ||
2611 | DEFINE_PER_CPU(struct ring_buffer_event *, trace_buffered_event); | |
2612 | DEFINE_PER_CPU(int, trace_buffered_event_cnt); | |
2613 | static int trace_buffered_event_ref; | |
2614 | ||
2615 | /** | |
2616 | * trace_buffered_event_enable - enable buffering events | |
2617 | * | |
2618 | * When events are being filtered, it is quicker to use a temporary | |
2619 | * buffer to write the event data into if there's a likely chance | |
2620 | * that it will not be committed. The discard of the ring buffer | |
2621 | * is not as fast as committing, and is much slower than copying | |
2622 | * a commit. | |
2623 | * | |
2624 | * When an event is to be filtered, allocate per cpu buffers to | |
2625 | * write the event data into, and if the event is filtered and discarded | |
2626 | * it is simply dropped, otherwise, the entire data is to be committed | |
2627 | * in one shot. | |
2628 | */ | |
2629 | void trace_buffered_event_enable(void) | |
2630 | { | |
2631 | struct ring_buffer_event *event; | |
2632 | struct page *page; | |
2633 | int cpu; | |
51a763dd | 2634 | |
0fc1b09f SRRH |
2635 | WARN_ON_ONCE(!mutex_is_locked(&event_mutex)); |
2636 | ||
2637 | if (trace_buffered_event_ref++) | |
2638 | return; | |
2639 | ||
2640 | for_each_tracing_cpu(cpu) { | |
2641 | page = alloc_pages_node(cpu_to_node(cpu), | |
2642 | GFP_KERNEL | __GFP_NORETRY, 0); | |
2643 | if (!page) | |
2644 | goto failed; | |
2645 | ||
2646 | event = page_address(page); | |
2647 | memset(event, 0, sizeof(*event)); | |
2648 | ||
2649 | per_cpu(trace_buffered_event, cpu) = event; | |
2650 | ||
2651 | preempt_disable(); | |
2652 | if (cpu == smp_processor_id() && | |
b427e765 | 2653 | __this_cpu_read(trace_buffered_event) != |
0fc1b09f SRRH |
2654 | per_cpu(trace_buffered_event, cpu)) |
2655 | WARN_ON_ONCE(1); | |
2656 | preempt_enable(); | |
51a763dd ACM |
2657 | } |
2658 | ||
0fc1b09f SRRH |
2659 | return; |
2660 | failed: | |
2661 | trace_buffered_event_disable(); | |
2662 | } | |
2663 | ||
2664 | static void enable_trace_buffered_event(void *data) | |
2665 | { | |
2666 | /* Probably not needed, but do it anyway */ | |
2667 | smp_rmb(); | |
2668 | this_cpu_dec(trace_buffered_event_cnt); | |
2669 | } | |
2670 | ||
2671 | static void disable_trace_buffered_event(void *data) | |
2672 | { | |
2673 | this_cpu_inc(trace_buffered_event_cnt); | |
2674 | } | |
2675 | ||
2676 | /** | |
2677 | * trace_buffered_event_disable - disable buffering events | |
2678 | * | |
2679 | * When a filter is removed, it is faster to not use the buffered | |
2680 | * events, and to commit directly into the ring buffer. Free up | |
2681 | * the temp buffers when there are no more users. This requires | |
2682 | * special synchronization with current events. | |
2683 | */ | |
2684 | void trace_buffered_event_disable(void) | |
2685 | { | |
2686 | int cpu; | |
2687 | ||
2688 | WARN_ON_ONCE(!mutex_is_locked(&event_mutex)); | |
2689 | ||
2690 | if (WARN_ON_ONCE(!trace_buffered_event_ref)) | |
2691 | return; | |
2692 | ||
2693 | if (--trace_buffered_event_ref) | |
2694 | return; | |
2695 | ||
2696 | preempt_disable(); | |
2697 | /* For each CPU, set the buffer as used. */ | |
2698 | smp_call_function_many(tracing_buffer_mask, | |
2699 | disable_trace_buffered_event, NULL, 1); | |
2700 | preempt_enable(); | |
2701 | ||
2702 | /* Wait for all current users to finish */ | |
74401729 | 2703 | synchronize_rcu(); |
0fc1b09f SRRH |
2704 | |
2705 | for_each_tracing_cpu(cpu) { | |
2706 | free_page((unsigned long)per_cpu(trace_buffered_event, cpu)); | |
2707 | per_cpu(trace_buffered_event, cpu) = NULL; | |
2708 | } | |
2709 | /* | |
2710 | * Make sure trace_buffered_event is NULL before clearing | |
2711 | * trace_buffered_event_cnt. | |
2712 | */ | |
2713 | smp_wmb(); | |
2714 | ||
2715 | preempt_disable(); | |
2716 | /* Do the work on each cpu */ | |
2717 | smp_call_function_many(tracing_buffer_mask, | |
2718 | enable_trace_buffered_event, NULL, 1); | |
2719 | preempt_enable(); | |
51a763dd | 2720 | } |
51a763dd | 2721 | |
13292494 | 2722 | static struct trace_buffer *temp_buffer; |
2c4a33ab | 2723 | |
ccb469a1 | 2724 | struct ring_buffer_event * |
13292494 | 2725 | trace_event_buffer_lock_reserve(struct trace_buffer **current_rb, |
7f1d2f82 | 2726 | struct trace_event_file *trace_file, |
ccb469a1 SR |
2727 | int type, unsigned long len, |
2728 | unsigned long flags, int pc) | |
2729 | { | |
2c4a33ab | 2730 | struct ring_buffer_event *entry; |
0fc1b09f | 2731 | int val; |
2c4a33ab | 2732 | |
1c5eb448 | 2733 | *current_rb = trace_file->tr->array_buffer.buffer; |
0fc1b09f | 2734 | |
00b41452 | 2735 | if (!ring_buffer_time_stamp_abs(*current_rb) && (trace_file->flags & |
0fc1b09f SRRH |
2736 | (EVENT_FILE_FL_SOFT_DISABLED | EVENT_FILE_FL_FILTERED)) && |
2737 | (entry = this_cpu_read(trace_buffered_event))) { | |
2738 | /* Try to use the per cpu buffer first */ | |
2739 | val = this_cpu_inc_return(trace_buffered_event_cnt); | |
2740 | if (val == 1) { | |
2741 | trace_event_setup(entry, type, flags, pc); | |
2742 | entry->array[0] = len; | |
2743 | return entry; | |
2744 | } | |
2745 | this_cpu_dec(trace_buffered_event_cnt); | |
2746 | } | |
2747 | ||
3e9a8aad SRRH |
2748 | entry = __trace_buffer_lock_reserve(*current_rb, |
2749 | type, len, flags, pc); | |
2c4a33ab SRRH |
2750 | /* |
2751 | * If tracing is off, but we have triggers enabled | |
2752 | * we still need to look at the event data. Use the temp_buffer | |
2753 | * to store the trace event for the tigger to use. It's recusive | |
2754 | * safe and will not be recorded anywhere. | |
2755 | */ | |
5d6ad960 | 2756 | if (!entry && trace_file->flags & EVENT_FILE_FL_TRIGGER_COND) { |
2c4a33ab | 2757 | *current_rb = temp_buffer; |
3e9a8aad SRRH |
2758 | entry = __trace_buffer_lock_reserve(*current_rb, |
2759 | type, len, flags, pc); | |
2c4a33ab SRRH |
2760 | } |
2761 | return entry; | |
ccb469a1 SR |
2762 | } |
2763 | EXPORT_SYMBOL_GPL(trace_event_buffer_lock_reserve); | |
2764 | ||
42391745 SRRH |
2765 | static DEFINE_SPINLOCK(tracepoint_iter_lock); |
2766 | static DEFINE_MUTEX(tracepoint_printk_mutex); | |
2767 | ||
2768 | static void output_printk(struct trace_event_buffer *fbuffer) | |
2769 | { | |
2770 | struct trace_event_call *event_call; | |
d8d0c245 | 2771 | struct trace_event_file *file; |
42391745 SRRH |
2772 | struct trace_event *event; |
2773 | unsigned long flags; | |
2774 | struct trace_iterator *iter = tracepoint_print_iter; | |
2775 | ||
2776 | /* We should never get here if iter is NULL */ | |
2777 | if (WARN_ON_ONCE(!iter)) | |
2778 | return; | |
2779 | ||
2780 | event_call = fbuffer->trace_file->event_call; | |
2781 | if (!event_call || !event_call->event.funcs || | |
2782 | !event_call->event.funcs->trace) | |
2783 | return; | |
2784 | ||
d8d0c245 MH |
2785 | file = fbuffer->trace_file; |
2786 | if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags) || | |
2787 | (unlikely(file->flags & EVENT_FILE_FL_FILTERED) && | |
2788 | !filter_match_preds(file->filter, fbuffer->entry))) | |
2789 | return; | |
2790 | ||
42391745 SRRH |
2791 | event = &fbuffer->trace_file->event_call->event; |
2792 | ||
2793 | spin_lock_irqsave(&tracepoint_iter_lock, flags); | |
2794 | trace_seq_init(&iter->seq); | |
2795 | iter->ent = fbuffer->entry; | |
2796 | event_call->event.funcs->trace(iter, 0, event); | |
2797 | trace_seq_putc(&iter->seq, 0); | |
2798 | printk("%s", iter->seq.buffer); | |
2799 | ||
2800 | spin_unlock_irqrestore(&tracepoint_iter_lock, flags); | |
2801 | } | |
2802 | ||
2803 | int tracepoint_printk_sysctl(struct ctl_table *table, int write, | |
32927393 | 2804 | void *buffer, size_t *lenp, |
42391745 SRRH |
2805 | loff_t *ppos) |
2806 | { | |
2807 | int save_tracepoint_printk; | |
2808 | int ret; | |
2809 | ||
2810 | mutex_lock(&tracepoint_printk_mutex); | |
2811 | save_tracepoint_printk = tracepoint_printk; | |
2812 | ||
2813 | ret = proc_dointvec(table, write, buffer, lenp, ppos); | |
2814 | ||
2815 | /* | |
2816 | * This will force exiting early, as tracepoint_printk | |
2817 | * is always zero when tracepoint_printk_iter is not allocated | |
2818 | */ | |
2819 | if (!tracepoint_print_iter) | |
2820 | tracepoint_printk = 0; | |
2821 | ||
2822 | if (save_tracepoint_printk == tracepoint_printk) | |
2823 | goto out; | |
2824 | ||
2825 | if (tracepoint_printk) | |
2826 | static_key_enable(&tracepoint_printk_key.key); | |
2827 | else | |
2828 | static_key_disable(&tracepoint_printk_key.key); | |
2829 | ||
2830 | out: | |
2831 | mutex_unlock(&tracepoint_printk_mutex); | |
2832 | ||
2833 | return ret; | |
2834 | } | |
2835 | ||
2836 | void trace_event_buffer_commit(struct trace_event_buffer *fbuffer) | |
2837 | { | |
2838 | if (static_key_false(&tracepoint_printk_key.key)) | |
2839 | output_printk(fbuffer); | |
2840 | ||
8ab7a2b7 TZ |
2841 | if (static_branch_unlikely(&trace_event_exports_enabled)) |
2842 | ftrace_exports(fbuffer->event, TRACE_EXPORT_EVENT); | |
8cfcf155 | 2843 | event_trigger_unlock_commit_regs(fbuffer->trace_file, fbuffer->buffer, |
42391745 | 2844 | fbuffer->event, fbuffer->entry, |
8cfcf155 | 2845 | fbuffer->flags, fbuffer->pc, fbuffer->regs); |
42391745 SRRH |
2846 | } |
2847 | EXPORT_SYMBOL_GPL(trace_event_buffer_commit); | |
2848 | ||
2ee5b92a SRV |
2849 | /* |
2850 | * Skip 3: | |
2851 | * | |
2852 | * trace_buffer_unlock_commit_regs() | |
2853 | * trace_event_buffer_commit() | |
2854 | * trace_event_raw_event_xxx() | |
13cf912b | 2855 | */ |
2ee5b92a SRV |
2856 | # define STACK_SKIP 3 |
2857 | ||
b7f0c959 | 2858 | void trace_buffer_unlock_commit_regs(struct trace_array *tr, |
13292494 | 2859 | struct trace_buffer *buffer, |
0d5c6e1c SR |
2860 | struct ring_buffer_event *event, |
2861 | unsigned long flags, int pc, | |
2862 | struct pt_regs *regs) | |
1fd8df2c | 2863 | { |
7ffbd48d | 2864 | __buffer_unlock_commit(buffer, event); |
1fd8df2c | 2865 | |
be54f69c | 2866 | /* |
2ee5b92a | 2867 | * If regs is not set, then skip the necessary functions. |
be54f69c SRRH |
2868 | * Note, we can still get here via blktrace, wakeup tracer |
2869 | * and mmiotrace, but that's ok if they lose a function or | |
2ee5b92a | 2870 | * two. They are not that meaningful. |
be54f69c | 2871 | */ |
2ee5b92a | 2872 | ftrace_trace_stack(tr, buffer, flags, regs ? 0 : STACK_SKIP, pc, regs); |
1fd8df2c MH |
2873 | ftrace_trace_userstack(buffer, flags, pc); |
2874 | } | |
1fd8df2c | 2875 | |
52ffabe3 SRRH |
2876 | /* |
2877 | * Similar to trace_buffer_unlock_commit_regs() but do not dump stack. | |
2878 | */ | |
2879 | void | |
13292494 | 2880 | trace_buffer_unlock_commit_nostack(struct trace_buffer *buffer, |
52ffabe3 SRRH |
2881 | struct ring_buffer_event *event) |
2882 | { | |
2883 | __buffer_unlock_commit(buffer, event); | |
2884 | } | |
2885 | ||
e309b41d | 2886 | void |
7be42151 | 2887 | trace_function(struct trace_array *tr, |
38697053 SR |
2888 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
2889 | int pc) | |
bc0c38d1 | 2890 | { |
2425bcb9 | 2891 | struct trace_event_call *call = &event_function; |
13292494 | 2892 | struct trace_buffer *buffer = tr->array_buffer.buffer; |
3928a8a2 | 2893 | struct ring_buffer_event *event; |
777e208d | 2894 | struct ftrace_entry *entry; |
bc0c38d1 | 2895 | |
3e9a8aad SRRH |
2896 | event = __trace_buffer_lock_reserve(buffer, TRACE_FN, sizeof(*entry), |
2897 | flags, pc); | |
3928a8a2 SR |
2898 | if (!event) |
2899 | return; | |
2900 | entry = ring_buffer_event_data(event); | |
777e208d SR |
2901 | entry->ip = ip; |
2902 | entry->parent_ip = parent_ip; | |
e1112b4d | 2903 | |
478409dd | 2904 | if (!call_filter_check_discard(call, entry, buffer, event)) { |
8438f521 TZ |
2905 | if (static_branch_unlikely(&trace_function_exports_enabled)) |
2906 | ftrace_exports(event, TRACE_EXPORT_FUNCTION); | |
7ffbd48d | 2907 | __buffer_unlock_commit(buffer, event); |
478409dd | 2908 | } |
bc0c38d1 SR |
2909 | } |
2910 | ||
c0a0d0d3 | 2911 | #ifdef CONFIG_STACKTRACE |
4a9bd3f1 | 2912 | |
2a820bf7 TG |
2913 | /* Allow 4 levels of nesting: normal, softirq, irq, NMI */ |
2914 | #define FTRACE_KSTACK_NESTING 4 | |
2915 | ||
2916 | #define FTRACE_KSTACK_ENTRIES (PAGE_SIZE / FTRACE_KSTACK_NESTING) | |
2917 | ||
4a9bd3f1 | 2918 | struct ftrace_stack { |
2a820bf7 | 2919 | unsigned long calls[FTRACE_KSTACK_ENTRIES]; |
4a9bd3f1 SR |
2920 | }; |
2921 | ||
2a820bf7 TG |
2922 | |
2923 | struct ftrace_stacks { | |
2924 | struct ftrace_stack stacks[FTRACE_KSTACK_NESTING]; | |
4a9bd3f1 SR |
2925 | }; |
2926 | ||
2a820bf7 | 2927 | static DEFINE_PER_CPU(struct ftrace_stacks, ftrace_stacks); |
4a9bd3f1 SR |
2928 | static DEFINE_PER_CPU(int, ftrace_stack_reserve); |
2929 | ||
13292494 | 2930 | static void __ftrace_trace_stack(struct trace_buffer *buffer, |
53614991 | 2931 | unsigned long flags, |
1fd8df2c | 2932 | int skip, int pc, struct pt_regs *regs) |
86387f7e | 2933 | { |
2425bcb9 | 2934 | struct trace_event_call *call = &event_kernel_stack; |
3928a8a2 | 2935 | struct ring_buffer_event *event; |
ee6dd0db | 2936 | unsigned int size, nr_entries; |
2a820bf7 | 2937 | struct ftrace_stack *fstack; |
777e208d | 2938 | struct stack_entry *entry; |
2a820bf7 | 2939 | int stackidx; |
4a9bd3f1 | 2940 | |
be54f69c | 2941 | /* |
2ee5b92a | 2942 | * Add one, for this function and the call to save_stack_trace() |
be54f69c SRRH |
2943 | * If regs is set, then these functions will not be in the way. |
2944 | */ | |
2ee5b92a | 2945 | #ifndef CONFIG_UNWINDER_ORC |
be54f69c | 2946 | if (!regs) |
ee6dd0db | 2947 | skip++; |
2ee5b92a | 2948 | #endif |
be54f69c | 2949 | |
4a9bd3f1 SR |
2950 | preempt_disable_notrace(); |
2951 | ||
2a820bf7 TG |
2952 | stackidx = __this_cpu_inc_return(ftrace_stack_reserve) - 1; |
2953 | ||
2954 | /* This should never happen. If it does, yell once and skip */ | |
2955 | if (WARN_ON_ONCE(stackidx > FTRACE_KSTACK_NESTING)) | |
2956 | goto out; | |
2957 | ||
4a9bd3f1 | 2958 | /* |
2a820bf7 TG |
2959 | * The above __this_cpu_inc_return() is 'atomic' cpu local. An |
2960 | * interrupt will either see the value pre increment or post | |
2961 | * increment. If the interrupt happens pre increment it will have | |
2962 | * restored the counter when it returns. We just need a barrier to | |
2963 | * keep gcc from moving things around. | |
4a9bd3f1 SR |
2964 | */ |
2965 | barrier(); | |
4a9bd3f1 | 2966 | |
2a820bf7 | 2967 | fstack = this_cpu_ptr(ftrace_stacks.stacks) + stackidx; |
ee6dd0db | 2968 | size = ARRAY_SIZE(fstack->calls); |
4a9bd3f1 | 2969 | |
ee6dd0db TG |
2970 | if (regs) { |
2971 | nr_entries = stack_trace_save_regs(regs, fstack->calls, | |
2972 | size, skip); | |
2973 | } else { | |
2974 | nr_entries = stack_trace_save(fstack->calls, size, skip); | |
2975 | } | |
86387f7e | 2976 | |
ee6dd0db | 2977 | size = nr_entries * sizeof(unsigned long); |
3e9a8aad SRRH |
2978 | event = __trace_buffer_lock_reserve(buffer, TRACE_STACK, |
2979 | sizeof(*entry) + size, flags, pc); | |
3928a8a2 | 2980 | if (!event) |
4a9bd3f1 SR |
2981 | goto out; |
2982 | entry = ring_buffer_event_data(event); | |
86387f7e | 2983 | |
ee6dd0db TG |
2984 | memcpy(&entry->caller, fstack->calls, size); |
2985 | entry->size = nr_entries; | |
86387f7e | 2986 | |
f306cc82 | 2987 | if (!call_filter_check_discard(call, entry, buffer, event)) |
7ffbd48d | 2988 | __buffer_unlock_commit(buffer, event); |
4a9bd3f1 SR |
2989 | |
2990 | out: | |
2991 | /* Again, don't let gcc optimize things here */ | |
2992 | barrier(); | |
82146529 | 2993 | __this_cpu_dec(ftrace_stack_reserve); |
4a9bd3f1 SR |
2994 | preempt_enable_notrace(); |
2995 | ||
f0a920d5 IM |
2996 | } |
2997 | ||
2d34f489 | 2998 | static inline void ftrace_trace_stack(struct trace_array *tr, |
13292494 | 2999 | struct trace_buffer *buffer, |
73dddbb5 SRRH |
3000 | unsigned long flags, |
3001 | int skip, int pc, struct pt_regs *regs) | |
53614991 | 3002 | { |
2d34f489 | 3003 | if (!(tr->trace_flags & TRACE_ITER_STACKTRACE)) |
53614991 SR |
3004 | return; |
3005 | ||
73dddbb5 | 3006 | __ftrace_trace_stack(buffer, flags, skip, pc, regs); |
53614991 SR |
3007 | } |
3008 | ||
c0a0d0d3 FW |
3009 | void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, |
3010 | int pc) | |
38697053 | 3011 | { |
13292494 | 3012 | struct trace_buffer *buffer = tr->array_buffer.buffer; |
a33d7d94 SRV |
3013 | |
3014 | if (rcu_is_watching()) { | |
3015 | __ftrace_trace_stack(buffer, flags, skip, pc, NULL); | |
3016 | return; | |
3017 | } | |
3018 | ||
3019 | /* | |
3020 | * When an NMI triggers, RCU is enabled via rcu_nmi_enter(), | |
3021 | * but if the above rcu_is_watching() failed, then the NMI | |
3022 | * triggered someplace critical, and rcu_irq_enter() should | |
3023 | * not be called from NMI. | |
3024 | */ | |
3025 | if (unlikely(in_nmi())) | |
3026 | return; | |
3027 | ||
a33d7d94 SRV |
3028 | rcu_irq_enter_irqson(); |
3029 | __ftrace_trace_stack(buffer, flags, skip, pc, NULL); | |
3030 | rcu_irq_exit_irqson(); | |
38697053 SR |
3031 | } |
3032 | ||
03889384 SR |
3033 | /** |
3034 | * trace_dump_stack - record a stack back trace in the trace buffer | |
c142be8e | 3035 | * @skip: Number of functions to skip (helper handlers) |
03889384 | 3036 | */ |
c142be8e | 3037 | void trace_dump_stack(int skip) |
03889384 SR |
3038 | { |
3039 | unsigned long flags; | |
3040 | ||
3041 | if (tracing_disabled || tracing_selftest_running) | |
e36c5458 | 3042 | return; |
03889384 SR |
3043 | |
3044 | local_save_flags(flags); | |
3045 | ||
2ee5b92a SRV |
3046 | #ifndef CONFIG_UNWINDER_ORC |
3047 | /* Skip 1 to skip this function. */ | |
3048 | skip++; | |
3049 | #endif | |
1c5eb448 | 3050 | __ftrace_trace_stack(global_trace.array_buffer.buffer, |
c142be8e | 3051 | flags, skip, preempt_count(), NULL); |
03889384 | 3052 | } |
da387e5c | 3053 | EXPORT_SYMBOL_GPL(trace_dump_stack); |
03889384 | 3054 | |
c438f140 | 3055 | #ifdef CONFIG_USER_STACKTRACE_SUPPORT |
91e86e56 SR |
3056 | static DEFINE_PER_CPU(int, user_stack_count); |
3057 | ||
c438f140 | 3058 | static void |
13292494 | 3059 | ftrace_trace_userstack(struct trace_buffer *buffer, unsigned long flags, int pc) |
02b67518 | 3060 | { |
2425bcb9 | 3061 | struct trace_event_call *call = &event_user_stack; |
8d7c6a96 | 3062 | struct ring_buffer_event *event; |
02b67518 | 3063 | struct userstack_entry *entry; |
02b67518 | 3064 | |
983f938a | 3065 | if (!(global_trace.trace_flags & TRACE_ITER_USERSTACKTRACE)) |
02b67518 TE |
3066 | return; |
3067 | ||
b6345879 SR |
3068 | /* |
3069 | * NMIs can not handle page faults, even with fix ups. | |
3070 | * The save user stack can (and often does) fault. | |
3071 | */ | |
3072 | if (unlikely(in_nmi())) | |
3073 | return; | |
02b67518 | 3074 | |
91e86e56 SR |
3075 | /* |
3076 | * prevent recursion, since the user stack tracing may | |
3077 | * trigger other kernel events. | |
3078 | */ | |
3079 | preempt_disable(); | |
3080 | if (__this_cpu_read(user_stack_count)) | |
3081 | goto out; | |
3082 | ||
3083 | __this_cpu_inc(user_stack_count); | |
3084 | ||
3e9a8aad SRRH |
3085 | event = __trace_buffer_lock_reserve(buffer, TRACE_USER_STACK, |
3086 | sizeof(*entry), flags, pc); | |
02b67518 | 3087 | if (!event) |
1dbd1951 | 3088 | goto out_drop_count; |
02b67518 | 3089 | entry = ring_buffer_event_data(event); |
02b67518 | 3090 | |
48659d31 | 3091 | entry->tgid = current->tgid; |
02b67518 TE |
3092 | memset(&entry->caller, 0, sizeof(entry->caller)); |
3093 | ||
ee6dd0db | 3094 | stack_trace_save_user(entry->caller, FTRACE_STACK_ENTRIES); |
f306cc82 | 3095 | if (!call_filter_check_discard(call, entry, buffer, event)) |
7ffbd48d | 3096 | __buffer_unlock_commit(buffer, event); |
91e86e56 | 3097 | |
1dbd1951 | 3098 | out_drop_count: |
91e86e56 | 3099 | __this_cpu_dec(user_stack_count); |
91e86e56 SR |
3100 | out: |
3101 | preempt_enable(); | |
02b67518 | 3102 | } |
c438f140 | 3103 | #else /* CONFIG_USER_STACKTRACE_SUPPORT */ |
13292494 | 3104 | static void ftrace_trace_userstack(struct trace_buffer *buffer, |
c438f140 | 3105 | unsigned long flags, int pc) |
02b67518 | 3106 | { |
02b67518 | 3107 | } |
c438f140 | 3108 | #endif /* !CONFIG_USER_STACKTRACE_SUPPORT */ |
02b67518 | 3109 | |
c0a0d0d3 FW |
3110 | #endif /* CONFIG_STACKTRACE */ |
3111 | ||
07d777fe SR |
3112 | /* created for use with alloc_percpu */ |
3113 | struct trace_buffer_struct { | |
e2ace001 AL |
3114 | int nesting; |
3115 | char buffer[4][TRACE_BUF_SIZE]; | |
07d777fe SR |
3116 | }; |
3117 | ||
3118 | static struct trace_buffer_struct *trace_percpu_buffer; | |
07d777fe SR |
3119 | |
3120 | /* | |
e2ace001 AL |
3121 | * Thise allows for lockless recording. If we're nested too deeply, then |
3122 | * this returns NULL. | |
07d777fe SR |
3123 | */ |
3124 | static char *get_trace_buf(void) | |
3125 | { | |
e2ace001 | 3126 | struct trace_buffer_struct *buffer = this_cpu_ptr(trace_percpu_buffer); |
07d777fe | 3127 | |
e2ace001 | 3128 | if (!buffer || buffer->nesting >= 4) |
07d777fe SR |
3129 | return NULL; |
3130 | ||
3d9622c1 SRV |
3131 | buffer->nesting++; |
3132 | ||
3133 | /* Interrupts must see nesting incremented before we use the buffer */ | |
3134 | barrier(); | |
3135 | return &buffer->buffer[buffer->nesting][0]; | |
e2ace001 AL |
3136 | } |
3137 | ||
3138 | static void put_trace_buf(void) | |
3139 | { | |
3d9622c1 SRV |
3140 | /* Don't let the decrement of nesting leak before this */ |
3141 | barrier(); | |
e2ace001 | 3142 | this_cpu_dec(trace_percpu_buffer->nesting); |
07d777fe SR |
3143 | } |
3144 | ||
3145 | static int alloc_percpu_trace_buffer(void) | |
3146 | { | |
3147 | struct trace_buffer_struct *buffers; | |
07d777fe | 3148 | |
38ce2a9e SRV |
3149 | if (trace_percpu_buffer) |
3150 | return 0; | |
3151 | ||
07d777fe | 3152 | buffers = alloc_percpu(struct trace_buffer_struct); |
24589e3a | 3153 | if (MEM_FAIL(!buffers, "Could not allocate percpu trace_printk buffer")) |
e2ace001 | 3154 | return -ENOMEM; |
07d777fe SR |
3155 | |
3156 | trace_percpu_buffer = buffers; | |
07d777fe | 3157 | return 0; |
07d777fe SR |
3158 | } |
3159 | ||
81698831 SR |
3160 | static int buffers_allocated; |
3161 | ||
07d777fe SR |
3162 | void trace_printk_init_buffers(void) |
3163 | { | |
07d777fe SR |
3164 | if (buffers_allocated) |
3165 | return; | |
3166 | ||
3167 | if (alloc_percpu_trace_buffer()) | |
3168 | return; | |
3169 | ||
2184db46 SR |
3170 | /* trace_printk() is for debug use only. Don't use it in production. */ |
3171 | ||
a395d6a7 JP |
3172 | pr_warn("\n"); |
3173 | pr_warn("**********************************************************\n"); | |
3174 | pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n"); | |
3175 | pr_warn("** **\n"); | |
3176 | pr_warn("** trace_printk() being used. Allocating extra memory. **\n"); | |
3177 | pr_warn("** **\n"); | |
3178 | pr_warn("** This means that this is a DEBUG kernel and it is **\n"); | |
3179 | pr_warn("** unsafe for production use. **\n"); | |
3180 | pr_warn("** **\n"); | |
3181 | pr_warn("** If you see this message and you are not debugging **\n"); | |
3182 | pr_warn("** the kernel, report this immediately to your vendor! **\n"); | |
3183 | pr_warn("** **\n"); | |
3184 | pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n"); | |
3185 | pr_warn("**********************************************************\n"); | |
07d777fe | 3186 | |
b382ede6 SR |
3187 | /* Expand the buffers to set size */ |
3188 | tracing_update_buffers(); | |
3189 | ||
07d777fe | 3190 | buffers_allocated = 1; |
81698831 SR |
3191 | |
3192 | /* | |
3193 | * trace_printk_init_buffers() can be called by modules. | |
3194 | * If that happens, then we need to start cmdline recording | |
3195 | * directly here. If the global_trace.buffer is already | |
3196 | * allocated here, then this was called by module code. | |
3197 | */ | |
1c5eb448 | 3198 | if (global_trace.array_buffer.buffer) |
81698831 SR |
3199 | tracing_start_cmdline_record(); |
3200 | } | |
f45d1225 | 3201 | EXPORT_SYMBOL_GPL(trace_printk_init_buffers); |
81698831 SR |
3202 | |
3203 | void trace_printk_start_comm(void) | |
3204 | { | |
3205 | /* Start tracing comms if trace printk is set */ | |
3206 | if (!buffers_allocated) | |
3207 | return; | |
3208 | tracing_start_cmdline_record(); | |
3209 | } | |
3210 | ||
3211 | static void trace_printk_start_stop_comm(int enabled) | |
3212 | { | |
3213 | if (!buffers_allocated) | |
3214 | return; | |
3215 | ||
3216 | if (enabled) | |
3217 | tracing_start_cmdline_record(); | |
3218 | else | |
3219 | tracing_stop_cmdline_record(); | |
07d777fe SR |
3220 | } |
3221 | ||
769b0441 | 3222 | /** |
48ead020 | 3223 | * trace_vbprintk - write binary msg to tracing buffer |
c68c9ec1 JK |
3224 | * @ip: The address of the caller |
3225 | * @fmt: The string format to write to the buffer | |
3226 | * @args: Arguments for @fmt | |
769b0441 | 3227 | */ |
40ce74f1 | 3228 | int trace_vbprintk(unsigned long ip, const char *fmt, va_list args) |
769b0441 | 3229 | { |
2425bcb9 | 3230 | struct trace_event_call *call = &event_bprint; |
769b0441 | 3231 | struct ring_buffer_event *event; |
13292494 | 3232 | struct trace_buffer *buffer; |
769b0441 | 3233 | struct trace_array *tr = &global_trace; |
48ead020 | 3234 | struct bprint_entry *entry; |
769b0441 | 3235 | unsigned long flags; |
07d777fe SR |
3236 | char *tbuffer; |
3237 | int len = 0, size, pc; | |
769b0441 FW |
3238 | |
3239 | if (unlikely(tracing_selftest_running || tracing_disabled)) | |
3240 | return 0; | |
3241 | ||
3242 | /* Don't pollute graph traces with trace_vprintk internals */ | |
3243 | pause_graph_tracing(); | |
3244 | ||
3245 | pc = preempt_count(); | |
5168ae50 | 3246 | preempt_disable_notrace(); |
769b0441 | 3247 | |
07d777fe SR |
3248 | tbuffer = get_trace_buf(); |
3249 | if (!tbuffer) { | |
3250 | len = 0; | |
e2ace001 | 3251 | goto out_nobuffer; |
07d777fe | 3252 | } |
769b0441 | 3253 | |
07d777fe | 3254 | len = vbin_printf((u32 *)tbuffer, TRACE_BUF_SIZE/sizeof(int), fmt, args); |
769b0441 | 3255 | |
07d777fe | 3256 | if (len > TRACE_BUF_SIZE/sizeof(int) || len < 0) |
34423f25 | 3257 | goto out_put; |
769b0441 | 3258 | |
07d777fe | 3259 | local_save_flags(flags); |
769b0441 | 3260 | size = sizeof(*entry) + sizeof(u32) * len; |
1c5eb448 | 3261 | buffer = tr->array_buffer.buffer; |
82d1b815 | 3262 | ring_buffer_nest_start(buffer); |
3e9a8aad SRRH |
3263 | event = __trace_buffer_lock_reserve(buffer, TRACE_BPRINT, size, |
3264 | flags, pc); | |
769b0441 | 3265 | if (!event) |
07d777fe | 3266 | goto out; |
769b0441 FW |
3267 | entry = ring_buffer_event_data(event); |
3268 | entry->ip = ip; | |
769b0441 FW |
3269 | entry->fmt = fmt; |
3270 | ||
07d777fe | 3271 | memcpy(entry->buf, tbuffer, sizeof(u32) * len); |
f306cc82 | 3272 | if (!call_filter_check_discard(call, entry, buffer, event)) { |
7ffbd48d | 3273 | __buffer_unlock_commit(buffer, event); |
2d34f489 | 3274 | ftrace_trace_stack(tr, buffer, flags, 6, pc, NULL); |
d931369b | 3275 | } |
769b0441 | 3276 | |
769b0441 | 3277 | out: |
82d1b815 | 3278 | ring_buffer_nest_end(buffer); |
34423f25 | 3279 | out_put: |
e2ace001 AL |
3280 | put_trace_buf(); |
3281 | ||
3282 | out_nobuffer: | |
5168ae50 | 3283 | preempt_enable_notrace(); |
769b0441 FW |
3284 | unpause_graph_tracing(); |
3285 | ||
3286 | return len; | |
3287 | } | |
48ead020 FW |
3288 | EXPORT_SYMBOL_GPL(trace_vbprintk); |
3289 | ||
26b68dd2 | 3290 | __printf(3, 0) |
12883efb | 3291 | static int |
13292494 | 3292 | __trace_array_vprintk(struct trace_buffer *buffer, |
12883efb | 3293 | unsigned long ip, const char *fmt, va_list args) |
48ead020 | 3294 | { |
2425bcb9 | 3295 | struct trace_event_call *call = &event_print; |
48ead020 | 3296 | struct ring_buffer_event *event; |
07d777fe | 3297 | int len = 0, size, pc; |
48ead020 | 3298 | struct print_entry *entry; |
07d777fe SR |
3299 | unsigned long flags; |
3300 | char *tbuffer; | |
48ead020 FW |
3301 | |
3302 | if (tracing_disabled || tracing_selftest_running) | |
3303 | return 0; | |
3304 | ||
07d777fe SR |
3305 | /* Don't pollute graph traces with trace_vprintk internals */ |
3306 | pause_graph_tracing(); | |
3307 | ||
48ead020 FW |
3308 | pc = preempt_count(); |
3309 | preempt_disable_notrace(); | |
48ead020 | 3310 | |
07d777fe SR |
3311 | |
3312 | tbuffer = get_trace_buf(); | |
3313 | if (!tbuffer) { | |
3314 | len = 0; | |
e2ace001 | 3315 | goto out_nobuffer; |
07d777fe | 3316 | } |
48ead020 | 3317 | |
3558a5ac | 3318 | len = vscnprintf(tbuffer, TRACE_BUF_SIZE, fmt, args); |
48ead020 | 3319 | |
07d777fe | 3320 | local_save_flags(flags); |
48ead020 | 3321 | size = sizeof(*entry) + len + 1; |
82d1b815 | 3322 | ring_buffer_nest_start(buffer); |
3e9a8aad SRRH |
3323 | event = __trace_buffer_lock_reserve(buffer, TRACE_PRINT, size, |
3324 | flags, pc); | |
48ead020 | 3325 | if (!event) |
07d777fe | 3326 | goto out; |
48ead020 | 3327 | entry = ring_buffer_event_data(event); |
c13d2f7c | 3328 | entry->ip = ip; |
48ead020 | 3329 | |
3558a5ac | 3330 | memcpy(&entry->buf, tbuffer, len + 1); |
f306cc82 | 3331 | if (!call_filter_check_discard(call, entry, buffer, event)) { |
7ffbd48d | 3332 | __buffer_unlock_commit(buffer, event); |
2d34f489 | 3333 | ftrace_trace_stack(&global_trace, buffer, flags, 6, pc, NULL); |
d931369b | 3334 | } |
e2ace001 AL |
3335 | |
3336 | out: | |
82d1b815 | 3337 | ring_buffer_nest_end(buffer); |
e2ace001 AL |
3338 | put_trace_buf(); |
3339 | ||
3340 | out_nobuffer: | |
48ead020 | 3341 | preempt_enable_notrace(); |
07d777fe | 3342 | unpause_graph_tracing(); |
48ead020 FW |
3343 | |
3344 | return len; | |
3345 | } | |
659372d3 | 3346 | |
26b68dd2 | 3347 | __printf(3, 0) |
12883efb SRRH |
3348 | int trace_array_vprintk(struct trace_array *tr, |
3349 | unsigned long ip, const char *fmt, va_list args) | |
3350 | { | |
1c5eb448 | 3351 | return __trace_array_vprintk(tr->array_buffer.buffer, ip, fmt, args); |
12883efb SRRH |
3352 | } |
3353 | ||
38ce2a9e SRV |
3354 | /** |
3355 | * trace_array_printk - Print a message to a specific instance | |
3356 | * @tr: The instance trace_array descriptor | |
3357 | * @ip: The instruction pointer that this is called from. | |
3358 | * @fmt: The format to print (printf format) | |
3359 | * | |
3360 | * If a subsystem sets up its own instance, they have the right to | |
3361 | * printk strings into their tracing instance buffer using this | |
3362 | * function. Note, this function will not write into the top level | |
3363 | * buffer (use trace_printk() for that), as writing into the top level | |
3364 | * buffer should only have events that can be individually disabled. | |
3365 | * trace_printk() is only used for debugging a kernel, and should not | |
3366 | * be ever encorporated in normal use. | |
3367 | * | |
3368 | * trace_array_printk() can be used, as it will not add noise to the | |
3369 | * top level tracing buffer. | |
3370 | * | |
3371 | * Note, trace_array_init_printk() must be called on @tr before this | |
3372 | * can be used. | |
3373 | */ | |
26b68dd2 | 3374 | __printf(3, 0) |
12883efb SRRH |
3375 | int trace_array_printk(struct trace_array *tr, |
3376 | unsigned long ip, const char *fmt, ...) | |
3377 | { | |
3378 | int ret; | |
3379 | va_list ap; | |
3380 | ||
953ae45a DI |
3381 | if (!tr) |
3382 | return -ENOENT; | |
3383 | ||
c791cc4b SRV |
3384 | /* This is only allowed for created instances */ |
3385 | if (tr == &global_trace) | |
3386 | return 0; | |
3387 | ||
3388 | if (!(tr->trace_flags & TRACE_ITER_PRINTK)) | |
3389 | return 0; | |
3390 | ||
12883efb SRRH |
3391 | va_start(ap, fmt); |
3392 | ret = trace_array_vprintk(tr, ip, fmt, ap); | |
3393 | va_end(ap); | |
3394 | return ret; | |
3395 | } | |
f45d1225 | 3396 | EXPORT_SYMBOL_GPL(trace_array_printk); |
12883efb | 3397 | |
38ce2a9e SRV |
3398 | /** |
3399 | * trace_array_init_printk - Initialize buffers for trace_array_printk() | |
3400 | * @tr: The trace array to initialize the buffers for | |
3401 | * | |
3402 | * As trace_array_printk() only writes into instances, they are OK to | |
3403 | * have in the kernel (unlike trace_printk()). This needs to be called | |
3404 | * before trace_array_printk() can be used on a trace_array. | |
3405 | */ | |
3406 | int trace_array_init_printk(struct trace_array *tr) | |
3407 | { | |
3408 | if (!tr) | |
3409 | return -ENOENT; | |
3410 | ||
3411 | /* This is only allowed for created instances */ | |
3412 | if (tr == &global_trace) | |
3413 | return -EINVAL; | |
3414 | ||
3415 | return alloc_percpu_trace_buffer(); | |
3416 | } | |
3417 | EXPORT_SYMBOL_GPL(trace_array_init_printk); | |
3418 | ||
26b68dd2 | 3419 | __printf(3, 4) |
13292494 | 3420 | int trace_array_printk_buf(struct trace_buffer *buffer, |
12883efb SRRH |
3421 | unsigned long ip, const char *fmt, ...) |
3422 | { | |
3423 | int ret; | |
3424 | va_list ap; | |
3425 | ||
983f938a | 3426 | if (!(global_trace.trace_flags & TRACE_ITER_PRINTK)) |
12883efb SRRH |
3427 | return 0; |
3428 | ||
3429 | va_start(ap, fmt); | |
3430 | ret = __trace_array_vprintk(buffer, ip, fmt, ap); | |
3431 | va_end(ap); | |
3432 | return ret; | |
3433 | } | |
3434 | ||
26b68dd2 | 3435 | __printf(2, 0) |
659372d3 SR |
3436 | int trace_vprintk(unsigned long ip, const char *fmt, va_list args) |
3437 | { | |
a813a159 | 3438 | return trace_array_vprintk(&global_trace, ip, fmt, args); |
659372d3 | 3439 | } |
769b0441 FW |
3440 | EXPORT_SYMBOL_GPL(trace_vprintk); |
3441 | ||
e2ac8ef5 | 3442 | static void trace_iterator_increment(struct trace_iterator *iter) |
5a90f577 | 3443 | { |
6d158a81 SR |
3444 | struct ring_buffer_iter *buf_iter = trace_buffer_iter(iter, iter->cpu); |
3445 | ||
5a90f577 | 3446 | iter->idx++; |
6d158a81 | 3447 | if (buf_iter) |
bc1a72af | 3448 | ring_buffer_iter_advance(buf_iter); |
5a90f577 SR |
3449 | } |
3450 | ||
e309b41d | 3451 | static struct trace_entry * |
bc21b478 SR |
3452 | peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts, |
3453 | unsigned long *lost_events) | |
dd0e545f | 3454 | { |
3928a8a2 | 3455 | struct ring_buffer_event *event; |
6d158a81 | 3456 | struct ring_buffer_iter *buf_iter = trace_buffer_iter(iter, cpu); |
dd0e545f | 3457 | |
c9b7a4a7 | 3458 | if (buf_iter) { |
d769041f | 3459 | event = ring_buffer_iter_peek(buf_iter, ts); |
c9b7a4a7 SRV |
3460 | if (lost_events) |
3461 | *lost_events = ring_buffer_iter_dropped(buf_iter) ? | |
3462 | (unsigned long)-1 : 0; | |
3463 | } else { | |
1c5eb448 | 3464 | event = ring_buffer_peek(iter->array_buffer->buffer, cpu, ts, |
bc21b478 | 3465 | lost_events); |
c9b7a4a7 | 3466 | } |
d769041f | 3467 | |
4a9bd3f1 SR |
3468 | if (event) { |
3469 | iter->ent_size = ring_buffer_event_length(event); | |
3470 | return ring_buffer_event_data(event); | |
3471 | } | |
3472 | iter->ent_size = 0; | |
3473 | return NULL; | |
dd0e545f | 3474 | } |
d769041f | 3475 | |
dd0e545f | 3476 | static struct trace_entry * |
bc21b478 SR |
3477 | __find_next_entry(struct trace_iterator *iter, int *ent_cpu, |
3478 | unsigned long *missing_events, u64 *ent_ts) | |
bc0c38d1 | 3479 | { |
13292494 | 3480 | struct trace_buffer *buffer = iter->array_buffer->buffer; |
bc0c38d1 | 3481 | struct trace_entry *ent, *next = NULL; |
aa27497c | 3482 | unsigned long lost_events = 0, next_lost = 0; |
b04cc6b1 | 3483 | int cpu_file = iter->cpu_file; |
3928a8a2 | 3484 | u64 next_ts = 0, ts; |
bc0c38d1 | 3485 | int next_cpu = -1; |
12b5da34 | 3486 | int next_size = 0; |
bc0c38d1 SR |
3487 | int cpu; |
3488 | ||
b04cc6b1 FW |
3489 | /* |
3490 | * If we are in a per_cpu trace file, don't bother by iterating over | |
3491 | * all cpu and peek directly. | |
3492 | */ | |
ae3b5093 | 3493 | if (cpu_file > RING_BUFFER_ALL_CPUS) { |
b04cc6b1 FW |
3494 | if (ring_buffer_empty_cpu(buffer, cpu_file)) |
3495 | return NULL; | |
bc21b478 | 3496 | ent = peek_next_entry(iter, cpu_file, ent_ts, missing_events); |
b04cc6b1 FW |
3497 | if (ent_cpu) |
3498 | *ent_cpu = cpu_file; | |
3499 | ||
3500 | return ent; | |
3501 | } | |
3502 | ||
ab46428c | 3503 | for_each_tracing_cpu(cpu) { |
dd0e545f | 3504 | |
3928a8a2 SR |
3505 | if (ring_buffer_empty_cpu(buffer, cpu)) |
3506 | continue; | |
dd0e545f | 3507 | |
bc21b478 | 3508 | ent = peek_next_entry(iter, cpu, &ts, &lost_events); |
dd0e545f | 3509 | |
cdd31cd2 IM |
3510 | /* |
3511 | * Pick the entry with the smallest timestamp: | |
3512 | */ | |
3928a8a2 | 3513 | if (ent && (!next || ts < next_ts)) { |
bc0c38d1 SR |
3514 | next = ent; |
3515 | next_cpu = cpu; | |
3928a8a2 | 3516 | next_ts = ts; |
bc21b478 | 3517 | next_lost = lost_events; |
12b5da34 | 3518 | next_size = iter->ent_size; |
bc0c38d1 SR |
3519 | } |
3520 | } | |
3521 | ||
12b5da34 SR |
3522 | iter->ent_size = next_size; |
3523 | ||
bc0c38d1 SR |
3524 | if (ent_cpu) |
3525 | *ent_cpu = next_cpu; | |
3526 | ||
3928a8a2 SR |
3527 | if (ent_ts) |
3528 | *ent_ts = next_ts; | |
3529 | ||
bc21b478 SR |
3530 | if (missing_events) |
3531 | *missing_events = next_lost; | |
3532 | ||
bc0c38d1 SR |
3533 | return next; |
3534 | } | |
3535 | ||
8e99cf91 SRV |
3536 | #define STATIC_TEMP_BUF_SIZE 128 |
3537 | static char static_temp_buf[STATIC_TEMP_BUF_SIZE]; | |
3538 | ||
dd0e545f | 3539 | /* Find the next real entry, without updating the iterator itself */ |
c4a8e8be FW |
3540 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, |
3541 | int *ent_cpu, u64 *ent_ts) | |
bc0c38d1 | 3542 | { |
ff895103 SRV |
3543 | /* __find_next_entry will reset ent_size */ |
3544 | int ent_size = iter->ent_size; | |
3545 | struct trace_entry *entry; | |
3546 | ||
8e99cf91 SRV |
3547 | /* |
3548 | * If called from ftrace_dump(), then the iter->temp buffer | |
3549 | * will be the static_temp_buf and not created from kmalloc. | |
3550 | * If the entry size is greater than the buffer, we can | |
3551 | * not save it. Just return NULL in that case. This is only | |
3552 | * used to add markers when two consecutive events' time | |
3553 | * stamps have a large delta. See trace_print_lat_context() | |
3554 | */ | |
3555 | if (iter->temp == static_temp_buf && | |
3556 | STATIC_TEMP_BUF_SIZE < ent_size) | |
3557 | return NULL; | |
3558 | ||
ff895103 SRV |
3559 | /* |
3560 | * The __find_next_entry() may call peek_next_entry(), which may | |
3561 | * call ring_buffer_peek() that may make the contents of iter->ent | |
3562 | * undefined. Need to copy iter->ent now. | |
3563 | */ | |
3564 | if (iter->ent && iter->ent != iter->temp) { | |
8e99cf91 SRV |
3565 | if ((!iter->temp || iter->temp_size < iter->ent_size) && |
3566 | !WARN_ON_ONCE(iter->temp == static_temp_buf)) { | |
851e6f61 SRV |
3567 | void *temp; |
3568 | temp = kmalloc(iter->ent_size, GFP_KERNEL); | |
3569 | if (!temp) | |
ff895103 | 3570 | return NULL; |
851e6f61 SRV |
3571 | kfree(iter->temp); |
3572 | iter->temp = temp; | |
3573 | iter->temp_size = iter->ent_size; | |
ff895103 SRV |
3574 | } |
3575 | memcpy(iter->temp, iter->ent, iter->ent_size); | |
ff895103 SRV |
3576 | iter->ent = iter->temp; |
3577 | } | |
3578 | entry = __find_next_entry(iter, ent_cpu, NULL, ent_ts); | |
3579 | /* Put back the original ent_size */ | |
3580 | iter->ent_size = ent_size; | |
3581 | ||
3582 | return entry; | |
dd0e545f SR |
3583 | } |
3584 | ||
3585 | /* Find the next real entry, and increment the iterator to the next entry */ | |
955b61e5 | 3586 | void *trace_find_next_entry_inc(struct trace_iterator *iter) |
dd0e545f | 3587 | { |
bc21b478 SR |
3588 | iter->ent = __find_next_entry(iter, &iter->cpu, |
3589 | &iter->lost_events, &iter->ts); | |
dd0e545f | 3590 | |
3928a8a2 | 3591 | if (iter->ent) |
e2ac8ef5 | 3592 | trace_iterator_increment(iter); |
dd0e545f | 3593 | |
3928a8a2 | 3594 | return iter->ent ? iter : NULL; |
b3806b43 | 3595 | } |
bc0c38d1 | 3596 | |
e309b41d | 3597 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 | 3598 | { |
1c5eb448 | 3599 | ring_buffer_consume(iter->array_buffer->buffer, iter->cpu, &iter->ts, |
bc21b478 | 3600 | &iter->lost_events); |
bc0c38d1 SR |
3601 | } |
3602 | ||
e309b41d | 3603 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
3604 | { |
3605 | struct trace_iterator *iter = m->private; | |
bc0c38d1 | 3606 | int i = (int)*pos; |
4e3c3333 | 3607 | void *ent; |
bc0c38d1 | 3608 | |
a63ce5b3 SR |
3609 | WARN_ON_ONCE(iter->leftover); |
3610 | ||
bc0c38d1 SR |
3611 | (*pos)++; |
3612 | ||
3613 | /* can't go backwards */ | |
3614 | if (iter->idx > i) | |
3615 | return NULL; | |
3616 | ||
3617 | if (iter->idx < 0) | |
955b61e5 | 3618 | ent = trace_find_next_entry_inc(iter); |
bc0c38d1 SR |
3619 | else |
3620 | ent = iter; | |
3621 | ||
3622 | while (ent && iter->idx < i) | |
955b61e5 | 3623 | ent = trace_find_next_entry_inc(iter); |
bc0c38d1 SR |
3624 | |
3625 | iter->pos = *pos; | |
3626 | ||
bc0c38d1 SR |
3627 | return ent; |
3628 | } | |
3629 | ||
955b61e5 | 3630 | void tracing_iter_reset(struct trace_iterator *iter, int cpu) |
2f26ebd5 | 3631 | { |
2f26ebd5 SR |
3632 | struct ring_buffer_iter *buf_iter; |
3633 | unsigned long entries = 0; | |
3634 | u64 ts; | |
3635 | ||
1c5eb448 | 3636 | per_cpu_ptr(iter->array_buffer->data, cpu)->skipped_entries = 0; |
2f26ebd5 | 3637 | |
6d158a81 SR |
3638 | buf_iter = trace_buffer_iter(iter, cpu); |
3639 | if (!buf_iter) | |
2f26ebd5 SR |
3640 | return; |
3641 | ||
2f26ebd5 SR |
3642 | ring_buffer_iter_reset(buf_iter); |
3643 | ||
3644 | /* | |
3645 | * We could have the case with the max latency tracers | |
3646 | * that a reset never took place on a cpu. This is evident | |
3647 | * by the timestamp being before the start of the buffer. | |
3648 | */ | |
69243720 | 3649 | while (ring_buffer_iter_peek(buf_iter, &ts)) { |
1c5eb448 | 3650 | if (ts >= iter->array_buffer->time_start) |
2f26ebd5 SR |
3651 | break; |
3652 | entries++; | |
bc1a72af | 3653 | ring_buffer_iter_advance(buf_iter); |
2f26ebd5 SR |
3654 | } |
3655 | ||
1c5eb448 | 3656 | per_cpu_ptr(iter->array_buffer->data, cpu)->skipped_entries = entries; |
2f26ebd5 SR |
3657 | } |
3658 | ||
d7350c3f | 3659 | /* |
d7350c3f FW |
3660 | * The current tracer is copied to avoid a global locking |
3661 | * all around. | |
3662 | */ | |
bc0c38d1 SR |
3663 | static void *s_start(struct seq_file *m, loff_t *pos) |
3664 | { | |
3665 | struct trace_iterator *iter = m->private; | |
2b6080f2 | 3666 | struct trace_array *tr = iter->tr; |
b04cc6b1 | 3667 | int cpu_file = iter->cpu_file; |
bc0c38d1 SR |
3668 | void *p = NULL; |
3669 | loff_t l = 0; | |
3928a8a2 | 3670 | int cpu; |
bc0c38d1 | 3671 | |
2fd196ec HT |
3672 | /* |
3673 | * copy the tracer to avoid using a global lock all around. | |
3674 | * iter->trace is a copy of current_trace, the pointer to the | |
3675 | * name may be used instead of a strcmp(), as iter->trace->name | |
3676 | * will point to the same string as current_trace->name. | |
3677 | */ | |
bc0c38d1 | 3678 | mutex_lock(&trace_types_lock); |
2b6080f2 SR |
3679 | if (unlikely(tr->current_trace && iter->trace->name != tr->current_trace->name)) |
3680 | *iter->trace = *tr->current_trace; | |
d7350c3f | 3681 | mutex_unlock(&trace_types_lock); |
bc0c38d1 | 3682 | |
12883efb | 3683 | #ifdef CONFIG_TRACER_MAX_TRACE |
debdd57f HT |
3684 | if (iter->snapshot && iter->trace->use_max_tr) |
3685 | return ERR_PTR(-EBUSY); | |
12883efb | 3686 | #endif |
debdd57f HT |
3687 | |
3688 | if (!iter->snapshot) | |
d914ba37 | 3689 | atomic_inc(&trace_record_taskinfo_disabled); |
bc0c38d1 | 3690 | |
bc0c38d1 SR |
3691 | if (*pos != iter->pos) { |
3692 | iter->ent = NULL; | |
3693 | iter->cpu = 0; | |
3694 | iter->idx = -1; | |
3695 | ||
ae3b5093 | 3696 | if (cpu_file == RING_BUFFER_ALL_CPUS) { |
b04cc6b1 | 3697 | for_each_tracing_cpu(cpu) |
2f26ebd5 | 3698 | tracing_iter_reset(iter, cpu); |
b04cc6b1 | 3699 | } else |
2f26ebd5 | 3700 | tracing_iter_reset(iter, cpu_file); |
bc0c38d1 | 3701 | |
ac91d854 | 3702 | iter->leftover = 0; |
bc0c38d1 SR |
3703 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
3704 | ; | |
3705 | ||
3706 | } else { | |
a63ce5b3 SR |
3707 | /* |
3708 | * If we overflowed the seq_file before, then we want | |
3709 | * to just reuse the trace_seq buffer again. | |
3710 | */ | |
3711 | if (iter->leftover) | |
3712 | p = iter; | |
3713 | else { | |
3714 | l = *pos - 1; | |
3715 | p = s_next(m, p, &l); | |
3716 | } | |
bc0c38d1 SR |
3717 | } |
3718 | ||
4f535968 | 3719 | trace_event_read_lock(); |
7e53bd42 | 3720 | trace_access_lock(cpu_file); |
bc0c38d1 SR |
3721 | return p; |
3722 | } | |
3723 | ||
3724 | static void s_stop(struct seq_file *m, void *p) | |
3725 | { | |
7e53bd42 LJ |
3726 | struct trace_iterator *iter = m->private; |
3727 | ||
12883efb | 3728 | #ifdef CONFIG_TRACER_MAX_TRACE |
debdd57f HT |
3729 | if (iter->snapshot && iter->trace->use_max_tr) |
3730 | return; | |
12883efb | 3731 | #endif |
debdd57f HT |
3732 | |
3733 | if (!iter->snapshot) | |
d914ba37 | 3734 | atomic_dec(&trace_record_taskinfo_disabled); |
12883efb | 3735 | |
7e53bd42 | 3736 | trace_access_unlock(iter->cpu_file); |
4f535968 | 3737 | trace_event_read_unlock(); |
bc0c38d1 SR |
3738 | } |
3739 | ||
ecffc8a8 | 3740 | static void |
1c5eb448 | 3741 | get_total_entries_cpu(struct array_buffer *buf, unsigned long *total, |
ecffc8a8 DA |
3742 | unsigned long *entries, int cpu) |
3743 | { | |
3744 | unsigned long count; | |
3745 | ||
3746 | count = ring_buffer_entries_cpu(buf->buffer, cpu); | |
3747 | /* | |
3748 | * If this buffer has skipped entries, then we hold all | |
3749 | * entries for the trace and we need to ignore the | |
3750 | * ones before the time stamp. | |
3751 | */ | |
3752 | if (per_cpu_ptr(buf->data, cpu)->skipped_entries) { | |
3753 | count -= per_cpu_ptr(buf->data, cpu)->skipped_entries; | |
3754 | /* total is the same as the entries */ | |
3755 | *total = count; | |
3756 | } else | |
3757 | *total = count + | |
3758 | ring_buffer_overrun_cpu(buf->buffer, cpu); | |
3759 | *entries = count; | |
3760 | } | |
3761 | ||
39eaf7ef | 3762 | static void |
1c5eb448 | 3763 | get_total_entries(struct array_buffer *buf, |
12883efb | 3764 | unsigned long *total, unsigned long *entries) |
39eaf7ef | 3765 | { |
ecffc8a8 | 3766 | unsigned long t, e; |
39eaf7ef SR |
3767 | int cpu; |
3768 | ||
3769 | *total = 0; | |
3770 | *entries = 0; | |
3771 | ||
3772 | for_each_tracing_cpu(cpu) { | |
ecffc8a8 DA |
3773 | get_total_entries_cpu(buf, &t, &e, cpu); |
3774 | *total += t; | |
3775 | *entries += e; | |
39eaf7ef SR |
3776 | } |
3777 | } | |
3778 | ||
ecffc8a8 DA |
3779 | unsigned long trace_total_entries_cpu(struct trace_array *tr, int cpu) |
3780 | { | |
3781 | unsigned long total, entries; | |
3782 | ||
3783 | if (!tr) | |
3784 | tr = &global_trace; | |
3785 | ||
1c5eb448 | 3786 | get_total_entries_cpu(&tr->array_buffer, &total, &entries, cpu); |
ecffc8a8 DA |
3787 | |
3788 | return entries; | |
3789 | } | |
3790 | ||
3791 | unsigned long trace_total_entries(struct trace_array *tr) | |
3792 | { | |
3793 | unsigned long total, entries; | |
3794 | ||
3795 | if (!tr) | |
3796 | tr = &global_trace; | |
3797 | ||
1c5eb448 | 3798 | get_total_entries(&tr->array_buffer, &total, &entries); |
ecffc8a8 DA |
3799 | |
3800 | return entries; | |
3801 | } | |
3802 | ||
e309b41d | 3803 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 | 3804 | { |
795d6379 SAS |
3805 | seq_puts(m, "# _------=> CPU# \n" |
3806 | "# / _-----=> irqs-off \n" | |
3807 | "# | / _----=> need-resched \n" | |
3808 | "# || / _---=> hardirq/softirq \n" | |
3809 | "# ||| / _--=> preempt-depth \n" | |
3810 | "# |||| / delay \n" | |
3811 | "# cmd pid ||||| time | caller \n" | |
3812 | "# \\ / ||||| \\ | / \n"); | |
bc0c38d1 SR |
3813 | } |
3814 | ||
1c5eb448 | 3815 | static void print_event_info(struct array_buffer *buf, struct seq_file *m) |
bc0c38d1 | 3816 | { |
39eaf7ef SR |
3817 | unsigned long total; |
3818 | unsigned long entries; | |
3819 | ||
12883efb | 3820 | get_total_entries(buf, &total, &entries); |
39eaf7ef SR |
3821 | seq_printf(m, "# entries-in-buffer/entries-written: %lu/%lu #P:%d\n", |
3822 | entries, total, num_online_cpus()); | |
3823 | seq_puts(m, "#\n"); | |
3824 | } | |
3825 | ||
1c5eb448 | 3826 | static void print_func_help_header(struct array_buffer *buf, struct seq_file *m, |
441dae8f | 3827 | unsigned int flags) |
39eaf7ef | 3828 | { |
441dae8f JF |
3829 | bool tgid = flags & TRACE_ITER_RECORD_TGID; |
3830 | ||
12883efb | 3831 | print_event_info(buf, m); |
441dae8f | 3832 | |
795d6379 SAS |
3833 | seq_printf(m, "# TASK-PID %s CPU# TIMESTAMP FUNCTION\n", tgid ? " TGID " : ""); |
3834 | seq_printf(m, "# | | %s | | |\n", tgid ? " | " : ""); | |
bc0c38d1 SR |
3835 | } |
3836 | ||
1c5eb448 | 3837 | static void print_func_help_header_irq(struct array_buffer *buf, struct seq_file *m, |
441dae8f | 3838 | unsigned int flags) |
77271ce4 | 3839 | { |
441dae8f | 3840 | bool tgid = flags & TRACE_ITER_RECORD_TGID; |
795d6379 SAS |
3841 | const char *space = " "; |
3842 | int prec = tgid ? 12 : 2; | |
b11fb737 | 3843 | |
9e738215 QP |
3844 | print_event_info(buf, m); |
3845 | ||
795d6379 SAS |
3846 | seq_printf(m, "# %.*s _-----=> irqs-off\n", prec, space); |
3847 | seq_printf(m, "# %.*s / _----=> need-resched\n", prec, space); | |
3848 | seq_printf(m, "# %.*s| / _---=> hardirq/softirq\n", prec, space); | |
3849 | seq_printf(m, "# %.*s|| / _--=> preempt-depth\n", prec, space); | |
3850 | seq_printf(m, "# %.*s||| / delay\n", prec, space); | |
3851 | seq_printf(m, "# TASK-PID %.*s CPU# |||| TIMESTAMP FUNCTION\n", prec, " TGID "); | |
3852 | seq_printf(m, "# | | %.*s | |||| | |\n", prec, " | "); | |
77271ce4 | 3853 | } |
bc0c38d1 | 3854 | |
62b915f1 | 3855 | void |
bc0c38d1 SR |
3856 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
3857 | { | |
983f938a | 3858 | unsigned long sym_flags = (global_trace.trace_flags & TRACE_ITER_SYM_MASK); |
1c5eb448 | 3859 | struct array_buffer *buf = iter->array_buffer; |
12883efb | 3860 | struct trace_array_cpu *data = per_cpu_ptr(buf->data, buf->cpu); |
2b6080f2 | 3861 | struct tracer *type = iter->trace; |
39eaf7ef SR |
3862 | unsigned long entries; |
3863 | unsigned long total; | |
bc0c38d1 SR |
3864 | const char *name = "preemption"; |
3865 | ||
d840f718 | 3866 | name = type->name; |
bc0c38d1 | 3867 | |
12883efb | 3868 | get_total_entries(buf, &total, &entries); |
bc0c38d1 | 3869 | |
888b55dc | 3870 | seq_printf(m, "# %s latency trace v1.1.5 on %s\n", |
bc0c38d1 | 3871 | name, UTS_RELEASE); |
888b55dc | 3872 | seq_puts(m, "# -----------------------------------" |
bc0c38d1 | 3873 | "---------------------------------\n"); |
888b55dc | 3874 | seq_printf(m, "# latency: %lu us, #%lu/%lu, CPU#%d |" |
bc0c38d1 | 3875 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", |
57f50be1 | 3876 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 3877 | entries, |
4c11d7ae | 3878 | total, |
12883efb | 3879 | buf->cpu, |
bc0c38d1 SR |
3880 | #if defined(CONFIG_PREEMPT_NONE) |
3881 | "server", | |
3882 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
3883 | "desktop", | |
b5c21b45 | 3884 | #elif defined(CONFIG_PREEMPT) |
bc0c38d1 | 3885 | "preempt", |
9c34fc4b SAS |
3886 | #elif defined(CONFIG_PREEMPT_RT) |
3887 | "preempt_rt", | |
bc0c38d1 SR |
3888 | #else |
3889 | "unknown", | |
3890 | #endif | |
3891 | /* These are reserved for later use */ | |
3892 | 0, 0, 0, 0); | |
3893 | #ifdef CONFIG_SMP | |
3894 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
3895 | #else | |
3896 | seq_puts(m, ")\n"); | |
3897 | #endif | |
888b55dc KM |
3898 | seq_puts(m, "# -----------------\n"); |
3899 | seq_printf(m, "# | task: %.16s-%d " | |
bc0c38d1 | 3900 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", |
d20b92ab EB |
3901 | data->comm, data->pid, |
3902 | from_kuid_munged(seq_user_ns(m), data->uid), data->nice, | |
bc0c38d1 | 3903 | data->policy, data->rt_priority); |
888b55dc | 3904 | seq_puts(m, "# -----------------\n"); |
bc0c38d1 SR |
3905 | |
3906 | if (data->critical_start) { | |
888b55dc | 3907 | seq_puts(m, "# => started at: "); |
214023c3 SR |
3908 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
3909 | trace_print_seq(m, &iter->seq); | |
888b55dc | 3910 | seq_puts(m, "\n# => ended at: "); |
214023c3 SR |
3911 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
3912 | trace_print_seq(m, &iter->seq); | |
8248ac05 | 3913 | seq_puts(m, "\n#\n"); |
bc0c38d1 SR |
3914 | } |
3915 | ||
888b55dc | 3916 | seq_puts(m, "#\n"); |
bc0c38d1 SR |
3917 | } |
3918 | ||
a309720c SR |
3919 | static void test_cpu_buff_start(struct trace_iterator *iter) |
3920 | { | |
3921 | struct trace_seq *s = &iter->seq; | |
983f938a | 3922 | struct trace_array *tr = iter->tr; |
a309720c | 3923 | |
983f938a | 3924 | if (!(tr->trace_flags & TRACE_ITER_ANNOTATE)) |
12ef7d44 SR |
3925 | return; |
3926 | ||
3927 | if (!(iter->iter_flags & TRACE_FILE_ANNOTATE)) | |
3928 | return; | |
3929 | ||
4dbbe2d8 MK |
3930 | if (cpumask_available(iter->started) && |
3931 | cpumask_test_cpu(iter->cpu, iter->started)) | |
a309720c SR |
3932 | return; |
3933 | ||
1c5eb448 | 3934 | if (per_cpu_ptr(iter->array_buffer->data, iter->cpu)->skipped_entries) |
2f26ebd5 SR |
3935 | return; |
3936 | ||
4dbbe2d8 | 3937 | if (cpumask_available(iter->started)) |
919cd979 | 3938 | cpumask_set_cpu(iter->cpu, iter->started); |
b0dfa978 FW |
3939 | |
3940 | /* Don't print started cpu buffer for the first entry of the trace */ | |
3941 | if (iter->idx > 1) | |
3942 | trace_seq_printf(s, "##### CPU %u buffer started ####\n", | |
3943 | iter->cpu); | |
a309720c SR |
3944 | } |
3945 | ||
2c4f035f | 3946 | static enum print_line_t print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 3947 | { |
983f938a | 3948 | struct trace_array *tr = iter->tr; |
214023c3 | 3949 | struct trace_seq *s = &iter->seq; |
983f938a | 3950 | unsigned long sym_flags = (tr->trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 3951 | struct trace_entry *entry; |
f633cef0 | 3952 | struct trace_event *event; |
bc0c38d1 | 3953 | |
4e3c3333 | 3954 | entry = iter->ent; |
dd0e545f | 3955 | |
a309720c SR |
3956 | test_cpu_buff_start(iter); |
3957 | ||
c4a8e8be | 3958 | event = ftrace_find_event(entry->type); |
bc0c38d1 | 3959 | |
983f938a | 3960 | if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) { |
19a7fe20 SRRH |
3961 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) |
3962 | trace_print_lat_context(iter); | |
3963 | else | |
3964 | trace_print_context(iter); | |
c4a8e8be | 3965 | } |
bc0c38d1 | 3966 | |
19a7fe20 SRRH |
3967 | if (trace_seq_has_overflowed(s)) |
3968 | return TRACE_TYPE_PARTIAL_LINE; | |
3969 | ||
268ccda0 | 3970 | if (event) |
a9a57763 | 3971 | return event->funcs->trace(iter, sym_flags, event); |
d9793bd8 | 3972 | |
19a7fe20 | 3973 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
02b67518 | 3974 | |
19a7fe20 | 3975 | return trace_handle_return(s); |
bc0c38d1 SR |
3976 | } |
3977 | ||
2c4f035f | 3978 | static enum print_line_t print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 | 3979 | { |
983f938a | 3980 | struct trace_array *tr = iter->tr; |
f9896bf3 IM |
3981 | struct trace_seq *s = &iter->seq; |
3982 | struct trace_entry *entry; | |
f633cef0 | 3983 | struct trace_event *event; |
f9896bf3 IM |
3984 | |
3985 | entry = iter->ent; | |
dd0e545f | 3986 | |
983f938a | 3987 | if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) |
19a7fe20 SRRH |
3988 | trace_seq_printf(s, "%d %d %llu ", |
3989 | entry->pid, iter->cpu, iter->ts); | |
3990 | ||
3991 | if (trace_seq_has_overflowed(s)) | |
3992 | return TRACE_TYPE_PARTIAL_LINE; | |
f9896bf3 | 3993 | |
f633cef0 | 3994 | event = ftrace_find_event(entry->type); |
268ccda0 | 3995 | if (event) |
a9a57763 | 3996 | return event->funcs->raw(iter, 0, event); |
d9793bd8 | 3997 | |
19a7fe20 | 3998 | trace_seq_printf(s, "%d ?\n", entry->type); |
777e208d | 3999 | |
19a7fe20 | 4000 | return trace_handle_return(s); |
f9896bf3 IM |
4001 | } |
4002 | ||
2c4f035f | 4003 | static enum print_line_t print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec | 4004 | { |
983f938a | 4005 | struct trace_array *tr = iter->tr; |
5e3ca0ec IM |
4006 | struct trace_seq *s = &iter->seq; |
4007 | unsigned char newline = '\n'; | |
4008 | struct trace_entry *entry; | |
f633cef0 | 4009 | struct trace_event *event; |
5e3ca0ec IM |
4010 | |
4011 | entry = iter->ent; | |
dd0e545f | 4012 | |
983f938a | 4013 | if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) { |
19a7fe20 SRRH |
4014 | SEQ_PUT_HEX_FIELD(s, entry->pid); |
4015 | SEQ_PUT_HEX_FIELD(s, iter->cpu); | |
4016 | SEQ_PUT_HEX_FIELD(s, iter->ts); | |
4017 | if (trace_seq_has_overflowed(s)) | |
4018 | return TRACE_TYPE_PARTIAL_LINE; | |
c4a8e8be | 4019 | } |
5e3ca0ec | 4020 | |
f633cef0 | 4021 | event = ftrace_find_event(entry->type); |
268ccda0 | 4022 | if (event) { |
a9a57763 | 4023 | enum print_line_t ret = event->funcs->hex(iter, 0, event); |
d9793bd8 ACM |
4024 | if (ret != TRACE_TYPE_HANDLED) |
4025 | return ret; | |
4026 | } | |
7104f300 | 4027 | |
19a7fe20 | 4028 | SEQ_PUT_FIELD(s, newline); |
5e3ca0ec | 4029 | |
19a7fe20 | 4030 | return trace_handle_return(s); |
5e3ca0ec IM |
4031 | } |
4032 | ||
2c4f035f | 4033 | static enum print_line_t print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa | 4034 | { |
983f938a | 4035 | struct trace_array *tr = iter->tr; |
cb0f12aa IM |
4036 | struct trace_seq *s = &iter->seq; |
4037 | struct trace_entry *entry; | |
f633cef0 | 4038 | struct trace_event *event; |
cb0f12aa IM |
4039 | |
4040 | entry = iter->ent; | |
dd0e545f | 4041 | |
983f938a | 4042 | if (tr->trace_flags & TRACE_ITER_CONTEXT_INFO) { |
19a7fe20 SRRH |
4043 | SEQ_PUT_FIELD(s, entry->pid); |
4044 | SEQ_PUT_FIELD(s, iter->cpu); | |
4045 | SEQ_PUT_FIELD(s, iter->ts); | |
4046 | if (trace_seq_has_overflowed(s)) | |
4047 | return TRACE_TYPE_PARTIAL_LINE; | |
c4a8e8be | 4048 | } |
cb0f12aa | 4049 | |
f633cef0 | 4050 | event = ftrace_find_event(entry->type); |
a9a57763 SR |
4051 | return event ? event->funcs->binary(iter, 0, event) : |
4052 | TRACE_TYPE_HANDLED; | |
cb0f12aa IM |
4053 | } |
4054 | ||
62b915f1 | 4055 | int trace_empty(struct trace_iterator *iter) |
bc0c38d1 | 4056 | { |
6d158a81 | 4057 | struct ring_buffer_iter *buf_iter; |
bc0c38d1 SR |
4058 | int cpu; |
4059 | ||
9aba60fe | 4060 | /* If we are looking at one CPU buffer, only check that one */ |
ae3b5093 | 4061 | if (iter->cpu_file != RING_BUFFER_ALL_CPUS) { |
9aba60fe | 4062 | cpu = iter->cpu_file; |
6d158a81 SR |
4063 | buf_iter = trace_buffer_iter(iter, cpu); |
4064 | if (buf_iter) { | |
4065 | if (!ring_buffer_iter_empty(buf_iter)) | |
9aba60fe SR |
4066 | return 0; |
4067 | } else { | |
1c5eb448 | 4068 | if (!ring_buffer_empty_cpu(iter->array_buffer->buffer, cpu)) |
9aba60fe SR |
4069 | return 0; |
4070 | } | |
4071 | return 1; | |
4072 | } | |
4073 | ||
ab46428c | 4074 | for_each_tracing_cpu(cpu) { |
6d158a81 SR |
4075 | buf_iter = trace_buffer_iter(iter, cpu); |
4076 | if (buf_iter) { | |
4077 | if (!ring_buffer_iter_empty(buf_iter)) | |
d769041f SR |
4078 | return 0; |
4079 | } else { | |
1c5eb448 | 4080 | if (!ring_buffer_empty_cpu(iter->array_buffer->buffer, cpu)) |
d769041f SR |
4081 | return 0; |
4082 | } | |
bc0c38d1 | 4083 | } |
d769041f | 4084 | |
797d3712 | 4085 | return 1; |
bc0c38d1 SR |
4086 | } |
4087 | ||
4f535968 | 4088 | /* Called with trace_event_read_lock() held. */ |
955b61e5 | 4089 | enum print_line_t print_trace_line(struct trace_iterator *iter) |
f9896bf3 | 4090 | { |
983f938a SRRH |
4091 | struct trace_array *tr = iter->tr; |
4092 | unsigned long trace_flags = tr->trace_flags; | |
2c4f035f FW |
4093 | enum print_line_t ret; |
4094 | ||
19a7fe20 | 4095 | if (iter->lost_events) { |
c9b7a4a7 SRV |
4096 | if (iter->lost_events == (unsigned long)-1) |
4097 | trace_seq_printf(&iter->seq, "CPU:%d [LOST EVENTS]\n", | |
4098 | iter->cpu); | |
4099 | else | |
4100 | trace_seq_printf(&iter->seq, "CPU:%d [LOST %lu EVENTS]\n", | |
4101 | iter->cpu, iter->lost_events); | |
19a7fe20 SRRH |
4102 | if (trace_seq_has_overflowed(&iter->seq)) |
4103 | return TRACE_TYPE_PARTIAL_LINE; | |
4104 | } | |
bc21b478 | 4105 | |
2c4f035f FW |
4106 | if (iter->trace && iter->trace->print_line) { |
4107 | ret = iter->trace->print_line(iter); | |
4108 | if (ret != TRACE_TYPE_UNHANDLED) | |
4109 | return ret; | |
4110 | } | |
72829bc3 | 4111 | |
09ae7234 SRRH |
4112 | if (iter->ent->type == TRACE_BPUTS && |
4113 | trace_flags & TRACE_ITER_PRINTK && | |
4114 | trace_flags & TRACE_ITER_PRINTK_MSGONLY) | |
4115 | return trace_print_bputs_msg_only(iter); | |
4116 | ||
48ead020 FW |
4117 | if (iter->ent->type == TRACE_BPRINT && |
4118 | trace_flags & TRACE_ITER_PRINTK && | |
4119 | trace_flags & TRACE_ITER_PRINTK_MSGONLY) | |
5ef841f6 | 4120 | return trace_print_bprintk_msg_only(iter); |
48ead020 | 4121 | |
66896a85 FW |
4122 | if (iter->ent->type == TRACE_PRINT && |
4123 | trace_flags & TRACE_ITER_PRINTK && | |
4124 | trace_flags & TRACE_ITER_PRINTK_MSGONLY) | |
5ef841f6 | 4125 | return trace_print_printk_msg_only(iter); |
66896a85 | 4126 | |
cb0f12aa IM |
4127 | if (trace_flags & TRACE_ITER_BIN) |
4128 | return print_bin_fmt(iter); | |
4129 | ||
5e3ca0ec IM |
4130 | if (trace_flags & TRACE_ITER_HEX) |
4131 | return print_hex_fmt(iter); | |
4132 | ||
f9896bf3 IM |
4133 | if (trace_flags & TRACE_ITER_RAW) |
4134 | return print_raw_fmt(iter); | |
4135 | ||
f9896bf3 IM |
4136 | return print_trace_fmt(iter); |
4137 | } | |
4138 | ||
7e9a49ef JO |
4139 | void trace_latency_header(struct seq_file *m) |
4140 | { | |
4141 | struct trace_iterator *iter = m->private; | |
983f938a | 4142 | struct trace_array *tr = iter->tr; |
7e9a49ef JO |
4143 | |
4144 | /* print nothing if the buffers are empty */ | |
4145 | if (trace_empty(iter)) | |
4146 | return; | |
4147 | ||
4148 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
4149 | print_trace_header(m, iter); | |
4150 | ||
983f938a | 4151 | if (!(tr->trace_flags & TRACE_ITER_VERBOSE)) |
7e9a49ef JO |
4152 | print_lat_help_header(m); |
4153 | } | |
4154 | ||
62b915f1 JO |
4155 | void trace_default_header(struct seq_file *m) |
4156 | { | |
4157 | struct trace_iterator *iter = m->private; | |
983f938a SRRH |
4158 | struct trace_array *tr = iter->tr; |
4159 | unsigned long trace_flags = tr->trace_flags; | |
62b915f1 | 4160 | |
f56e7f8e JO |
4161 | if (!(trace_flags & TRACE_ITER_CONTEXT_INFO)) |
4162 | return; | |
4163 | ||
62b915f1 JO |
4164 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { |
4165 | /* print nothing if the buffers are empty */ | |
4166 | if (trace_empty(iter)) | |
4167 | return; | |
4168 | print_trace_header(m, iter); | |
4169 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
4170 | print_lat_help_header(m); | |
4171 | } else { | |
77271ce4 SR |
4172 | if (!(trace_flags & TRACE_ITER_VERBOSE)) { |
4173 | if (trace_flags & TRACE_ITER_IRQ_INFO) | |
1c5eb448 | 4174 | print_func_help_header_irq(iter->array_buffer, |
441dae8f | 4175 | m, trace_flags); |
77271ce4 | 4176 | else |
1c5eb448 | 4177 | print_func_help_header(iter->array_buffer, m, |
441dae8f | 4178 | trace_flags); |
77271ce4 | 4179 | } |
62b915f1 JO |
4180 | } |
4181 | } | |
4182 | ||
e0a413f6 SR |
4183 | static void test_ftrace_alive(struct seq_file *m) |
4184 | { | |
4185 | if (!ftrace_is_dead()) | |
4186 | return; | |
d79ac28f RV |
4187 | seq_puts(m, "# WARNING: FUNCTION TRACING IS CORRUPTED\n" |
4188 | "# MAY BE MISSING FUNCTION EVENTS\n"); | |
e0a413f6 SR |
4189 | } |
4190 | ||
d8741e2e | 4191 | #ifdef CONFIG_TRACER_MAX_TRACE |
f1affcaa | 4192 | static void show_snapshot_main_help(struct seq_file *m) |
d8741e2e | 4193 | { |
d79ac28f RV |
4194 | seq_puts(m, "# echo 0 > snapshot : Clears and frees snapshot buffer\n" |
4195 | "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n" | |
4196 | "# Takes a snapshot of the main buffer.\n" | |
4197 | "# echo 2 > snapshot : Clears snapshot buffer (but does not allocate or free)\n" | |
4198 | "# (Doesn't have to be '2' works with any number that\n" | |
4199 | "# is not a '0' or '1')\n"); | |
d8741e2e | 4200 | } |
f1affcaa SRRH |
4201 | |
4202 | static void show_snapshot_percpu_help(struct seq_file *m) | |
4203 | { | |
fa6f0cc7 | 4204 | seq_puts(m, "# echo 0 > snapshot : Invalid for per_cpu snapshot file.\n"); |
f1affcaa | 4205 | #ifdef CONFIG_RING_BUFFER_ALLOW_SWAP |
d79ac28f RV |
4206 | seq_puts(m, "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n" |
4207 | "# Takes a snapshot of the main buffer for this cpu.\n"); | |
f1affcaa | 4208 | #else |
d79ac28f RV |
4209 | seq_puts(m, "# echo 1 > snapshot : Not supported with this kernel.\n" |
4210 | "# Must use main snapshot file to allocate.\n"); | |
f1affcaa | 4211 | #endif |
d79ac28f RV |
4212 | seq_puts(m, "# echo 2 > snapshot : Clears this cpu's snapshot buffer (but does not allocate)\n" |
4213 | "# (Doesn't have to be '2' works with any number that\n" | |
4214 | "# is not a '0' or '1')\n"); | |
f1affcaa SRRH |
4215 | } |
4216 | ||
d8741e2e SRRH |
4217 | static void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter) |
4218 | { | |
45ad21ca | 4219 | if (iter->tr->allocated_snapshot) |
fa6f0cc7 | 4220 | seq_puts(m, "#\n# * Snapshot is allocated *\n#\n"); |
d8741e2e | 4221 | else |
fa6f0cc7 | 4222 | seq_puts(m, "#\n# * Snapshot is freed *\n#\n"); |
d8741e2e | 4223 | |
fa6f0cc7 | 4224 | seq_puts(m, "# Snapshot commands:\n"); |
f1affcaa SRRH |
4225 | if (iter->cpu_file == RING_BUFFER_ALL_CPUS) |
4226 | show_snapshot_main_help(m); | |
4227 | else | |
4228 | show_snapshot_percpu_help(m); | |
d8741e2e SRRH |
4229 | } |
4230 | #else | |
4231 | /* Should never be called */ | |
4232 | static inline void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter) { } | |
4233 | #endif | |
4234 | ||
bc0c38d1 SR |
4235 | static int s_show(struct seq_file *m, void *v) |
4236 | { | |
4237 | struct trace_iterator *iter = v; | |
a63ce5b3 | 4238 | int ret; |
bc0c38d1 SR |
4239 | |
4240 | if (iter->ent == NULL) { | |
4241 | if (iter->tr) { | |
4242 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
4243 | seq_puts(m, "#\n"); | |
e0a413f6 | 4244 | test_ftrace_alive(m); |
bc0c38d1 | 4245 | } |
d8741e2e SRRH |
4246 | if (iter->snapshot && trace_empty(iter)) |
4247 | print_snapshot_help(m, iter); | |
4248 | else if (iter->trace && iter->trace->print_header) | |
8bba1bf5 | 4249 | iter->trace->print_header(m); |
62b915f1 JO |
4250 | else |
4251 | trace_default_header(m); | |
4252 | ||
a63ce5b3 SR |
4253 | } else if (iter->leftover) { |
4254 | /* | |
4255 | * If we filled the seq_file buffer earlier, we | |
4256 | * want to just show it now. | |
4257 | */ | |
4258 | ret = trace_print_seq(m, &iter->seq); | |
4259 | ||
4260 | /* ret should this time be zero, but you never know */ | |
4261 | iter->leftover = ret; | |
4262 | ||
bc0c38d1 | 4263 | } else { |
f9896bf3 | 4264 | print_trace_line(iter); |
a63ce5b3 SR |
4265 | ret = trace_print_seq(m, &iter->seq); |
4266 | /* | |
4267 | * If we overflow the seq_file buffer, then it will | |
4268 | * ask us for this data again at start up. | |
4269 | * Use that instead. | |
4270 | * ret is 0 if seq_file write succeeded. | |
4271 | * -1 otherwise. | |
4272 | */ | |
4273 | iter->leftover = ret; | |
bc0c38d1 SR |
4274 | } |
4275 | ||
4276 | return 0; | |
4277 | } | |
4278 | ||
649e9c70 ON |
4279 | /* |
4280 | * Should be used after trace_array_get(), trace_types_lock | |
4281 | * ensures that i_cdev was already initialized. | |
4282 | */ | |
4283 | static inline int tracing_get_cpu(struct inode *inode) | |
4284 | { | |
4285 | if (inode->i_cdev) /* See trace_create_cpu_file() */ | |
4286 | return (long)inode->i_cdev - 1; | |
4287 | return RING_BUFFER_ALL_CPUS; | |
4288 | } | |
4289 | ||
88e9d34c | 4290 | static const struct seq_operations tracer_seq_ops = { |
4bf39a94 IM |
4291 | .start = s_start, |
4292 | .next = s_next, | |
4293 | .stop = s_stop, | |
4294 | .show = s_show, | |
bc0c38d1 SR |
4295 | }; |
4296 | ||
e309b41d | 4297 | static struct trace_iterator * |
6484c71c | 4298 | __tracing_open(struct inode *inode, struct file *file, bool snapshot) |
bc0c38d1 | 4299 | { |
6484c71c | 4300 | struct trace_array *tr = inode->i_private; |
bc0c38d1 | 4301 | struct trace_iterator *iter; |
50e18b94 | 4302 | int cpu; |
bc0c38d1 | 4303 | |
85a2f9b4 SR |
4304 | if (tracing_disabled) |
4305 | return ERR_PTR(-ENODEV); | |
60a11774 | 4306 | |
50e18b94 | 4307 | iter = __seq_open_private(file, &tracer_seq_ops, sizeof(*iter)); |
85a2f9b4 SR |
4308 | if (!iter) |
4309 | return ERR_PTR(-ENOMEM); | |
bc0c38d1 | 4310 | |
72917235 | 4311 | iter->buffer_iter = kcalloc(nr_cpu_ids, sizeof(*iter->buffer_iter), |
6d158a81 | 4312 | GFP_KERNEL); |
93574fcc DC |
4313 | if (!iter->buffer_iter) |
4314 | goto release; | |
4315 | ||
ff895103 SRV |
4316 | /* |
4317 | * trace_find_next_entry() may need to save off iter->ent. | |
4318 | * It will place it into the iter->temp buffer. As most | |
4319 | * events are less than 128, allocate a buffer of that size. | |
4320 | * If one is greater, then trace_find_next_entry() will | |
4321 | * allocate a new buffer to adjust for the bigger iter->ent. | |
4322 | * It's not critical if it fails to get allocated here. | |
4323 | */ | |
4324 | iter->temp = kmalloc(128, GFP_KERNEL); | |
4325 | if (iter->temp) | |
4326 | iter->temp_size = 128; | |
4327 | ||
d7350c3f FW |
4328 | /* |
4329 | * We make a copy of the current tracer to avoid concurrent | |
4330 | * changes on it while we are reading. | |
4331 | */ | |
bc0c38d1 | 4332 | mutex_lock(&trace_types_lock); |
d7350c3f | 4333 | iter->trace = kzalloc(sizeof(*iter->trace), GFP_KERNEL); |
85a2f9b4 | 4334 | if (!iter->trace) |
d7350c3f | 4335 | goto fail; |
85a2f9b4 | 4336 | |
2b6080f2 | 4337 | *iter->trace = *tr->current_trace; |
d7350c3f | 4338 | |
79f55997 | 4339 | if (!zalloc_cpumask_var(&iter->started, GFP_KERNEL)) |
b0dfa978 FW |
4340 | goto fail; |
4341 | ||
12883efb SRRH |
4342 | iter->tr = tr; |
4343 | ||
4344 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2b6080f2 SR |
4345 | /* Currently only the top directory has a snapshot */ |
4346 | if (tr->current_trace->print_max || snapshot) | |
1c5eb448 | 4347 | iter->array_buffer = &tr->max_buffer; |
bc0c38d1 | 4348 | else |
12883efb | 4349 | #endif |
1c5eb448 | 4350 | iter->array_buffer = &tr->array_buffer; |
debdd57f | 4351 | iter->snapshot = snapshot; |
bc0c38d1 | 4352 | iter->pos = -1; |
6484c71c | 4353 | iter->cpu_file = tracing_get_cpu(inode); |
d7350c3f | 4354 | mutex_init(&iter->mutex); |
bc0c38d1 | 4355 | |
8bba1bf5 | 4356 | /* Notify the tracer early; before we stop tracing. */ |
b3f7a6cd | 4357 | if (iter->trace->open) |
a93751ca | 4358 | iter->trace->open(iter); |
8bba1bf5 | 4359 | |
12ef7d44 | 4360 | /* Annotate start of buffers if we had overruns */ |
1c5eb448 | 4361 | if (ring_buffer_overruns(iter->array_buffer->buffer)) |
12ef7d44 SR |
4362 | iter->iter_flags |= TRACE_FILE_ANNOTATE; |
4363 | ||
8be0709f | 4364 | /* Output in nanoseconds only if we are using a clock in nanoseconds. */ |
58e8eedf | 4365 | if (trace_clocks[tr->clock_id].in_ns) |
8be0709f DS |
4366 | iter->iter_flags |= TRACE_FILE_TIME_IN_NS; |
4367 | ||
06e0a548 SRV |
4368 | /* |
4369 | * If pause-on-trace is enabled, then stop the trace while | |
4370 | * dumping, unless this is the "snapshot" file | |
4371 | */ | |
4372 | if (!iter->snapshot && (tr->trace_flags & TRACE_ITER_PAUSE_ON_TRACE)) | |
2b6080f2 | 4373 | tracing_stop_tr(tr); |
2f26ebd5 | 4374 | |
ae3b5093 | 4375 | if (iter->cpu_file == RING_BUFFER_ALL_CPUS) { |
b04cc6b1 | 4376 | for_each_tracing_cpu(cpu) { |
b04cc6b1 | 4377 | iter->buffer_iter[cpu] = |
1c5eb448 | 4378 | ring_buffer_read_prepare(iter->array_buffer->buffer, |
31b265b3 | 4379 | cpu, GFP_KERNEL); |
72c9ddfd DM |
4380 | } |
4381 | ring_buffer_read_prepare_sync(); | |
4382 | for_each_tracing_cpu(cpu) { | |
4383 | ring_buffer_read_start(iter->buffer_iter[cpu]); | |
2f26ebd5 | 4384 | tracing_iter_reset(iter, cpu); |
b04cc6b1 FW |
4385 | } |
4386 | } else { | |
4387 | cpu = iter->cpu_file; | |
3928a8a2 | 4388 | iter->buffer_iter[cpu] = |
1c5eb448 | 4389 | ring_buffer_read_prepare(iter->array_buffer->buffer, |
31b265b3 | 4390 | cpu, GFP_KERNEL); |
72c9ddfd DM |
4391 | ring_buffer_read_prepare_sync(); |
4392 | ring_buffer_read_start(iter->buffer_iter[cpu]); | |
2f26ebd5 | 4393 | tracing_iter_reset(iter, cpu); |
3928a8a2 SR |
4394 | } |
4395 | ||
bc0c38d1 SR |
4396 | mutex_unlock(&trace_types_lock); |
4397 | ||
bc0c38d1 | 4398 | return iter; |
3928a8a2 | 4399 | |
d7350c3f | 4400 | fail: |
3928a8a2 | 4401 | mutex_unlock(&trace_types_lock); |
d7350c3f | 4402 | kfree(iter->trace); |
ff895103 | 4403 | kfree(iter->temp); |
6d158a81 | 4404 | kfree(iter->buffer_iter); |
93574fcc | 4405 | release: |
50e18b94 JO |
4406 | seq_release_private(inode, file); |
4407 | return ERR_PTR(-ENOMEM); | |
bc0c38d1 SR |
4408 | } |
4409 | ||
4410 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
4411 | { | |
8530dec6 SRV |
4412 | int ret; |
4413 | ||
4414 | ret = tracing_check_open_get_tr(NULL); | |
4415 | if (ret) | |
4416 | return ret; | |
60a11774 | 4417 | |
bc0c38d1 SR |
4418 | filp->private_data = inode->i_private; |
4419 | return 0; | |
4420 | } | |
4421 | ||
2e86421d GB |
4422 | bool tracing_is_disabled(void) |
4423 | { | |
4424 | return (tracing_disabled) ? true: false; | |
4425 | } | |
4426 | ||
7b85af63 SRRH |
4427 | /* |
4428 | * Open and update trace_array ref count. | |
4429 | * Must have the current trace_array passed to it. | |
4430 | */ | |
aa07d71f | 4431 | int tracing_open_generic_tr(struct inode *inode, struct file *filp) |
7b85af63 SRRH |
4432 | { |
4433 | struct trace_array *tr = inode->i_private; | |
8530dec6 | 4434 | int ret; |
7b85af63 | 4435 | |
8530dec6 SRV |
4436 | ret = tracing_check_open_get_tr(tr); |
4437 | if (ret) | |
4438 | return ret; | |
7b85af63 SRRH |
4439 | |
4440 | filp->private_data = inode->i_private; | |
4441 | ||
4442 | return 0; | |
7b85af63 SRRH |
4443 | } |
4444 | ||
4fd27358 | 4445 | static int tracing_release(struct inode *inode, struct file *file) |
bc0c38d1 | 4446 | { |
6484c71c | 4447 | struct trace_array *tr = inode->i_private; |
907f2784 | 4448 | struct seq_file *m = file->private_data; |
4acd4d00 | 4449 | struct trace_iterator *iter; |
3928a8a2 | 4450 | int cpu; |
bc0c38d1 | 4451 | |
ff451961 | 4452 | if (!(file->f_mode & FMODE_READ)) { |
6484c71c | 4453 | trace_array_put(tr); |
4acd4d00 | 4454 | return 0; |
ff451961 | 4455 | } |
4acd4d00 | 4456 | |
6484c71c | 4457 | /* Writes do not use seq_file */ |
4acd4d00 | 4458 | iter = m->private; |
bc0c38d1 | 4459 | mutex_lock(&trace_types_lock); |
a695cb58 | 4460 | |
3928a8a2 SR |
4461 | for_each_tracing_cpu(cpu) { |
4462 | if (iter->buffer_iter[cpu]) | |
4463 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
4464 | } | |
4465 | ||
bc0c38d1 SR |
4466 | if (iter->trace && iter->trace->close) |
4467 | iter->trace->close(iter); | |
4468 | ||
06e0a548 | 4469 | if (!iter->snapshot && tr->stop_count) |
debdd57f | 4470 | /* reenable tracing if it was previously enabled */ |
2b6080f2 | 4471 | tracing_start_tr(tr); |
f77d09a3 AL |
4472 | |
4473 | __trace_array_put(tr); | |
4474 | ||
bc0c38d1 SR |
4475 | mutex_unlock(&trace_types_lock); |
4476 | ||
d7350c3f | 4477 | mutex_destroy(&iter->mutex); |
b0dfa978 | 4478 | free_cpumask_var(iter->started); |
ff895103 | 4479 | kfree(iter->temp); |
d7350c3f | 4480 | kfree(iter->trace); |
6d158a81 | 4481 | kfree(iter->buffer_iter); |
50e18b94 | 4482 | seq_release_private(inode, file); |
ff451961 | 4483 | |
bc0c38d1 SR |
4484 | return 0; |
4485 | } | |
4486 | ||
7b85af63 SRRH |
4487 | static int tracing_release_generic_tr(struct inode *inode, struct file *file) |
4488 | { | |
4489 | struct trace_array *tr = inode->i_private; | |
4490 | ||
4491 | trace_array_put(tr); | |
bc0c38d1 SR |
4492 | return 0; |
4493 | } | |
4494 | ||
7b85af63 SRRH |
4495 | static int tracing_single_release_tr(struct inode *inode, struct file *file) |
4496 | { | |
4497 | struct trace_array *tr = inode->i_private; | |
4498 | ||
4499 | trace_array_put(tr); | |
4500 | ||
4501 | return single_release(inode, file); | |
4502 | } | |
4503 | ||
bc0c38d1 SR |
4504 | static int tracing_open(struct inode *inode, struct file *file) |
4505 | { | |
6484c71c | 4506 | struct trace_array *tr = inode->i_private; |
85a2f9b4 | 4507 | struct trace_iterator *iter; |
8530dec6 | 4508 | int ret; |
bc0c38d1 | 4509 | |
8530dec6 SRV |
4510 | ret = tracing_check_open_get_tr(tr); |
4511 | if (ret) | |
4512 | return ret; | |
ff451961 | 4513 | |
4acd4d00 | 4514 | /* If this file was open for write, then erase contents */ |
6484c71c ON |
4515 | if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) { |
4516 | int cpu = tracing_get_cpu(inode); | |
1c5eb448 | 4517 | struct array_buffer *trace_buf = &tr->array_buffer; |
8dd33bcb BY |
4518 | |
4519 | #ifdef CONFIG_TRACER_MAX_TRACE | |
4520 | if (tr->current_trace->print_max) | |
4521 | trace_buf = &tr->max_buffer; | |
4522 | #endif | |
6484c71c ON |
4523 | |
4524 | if (cpu == RING_BUFFER_ALL_CPUS) | |
8dd33bcb | 4525 | tracing_reset_online_cpus(trace_buf); |
4acd4d00 | 4526 | else |
a47b53e9 | 4527 | tracing_reset_cpu(trace_buf, cpu); |
4acd4d00 | 4528 | } |
bc0c38d1 | 4529 | |
4acd4d00 | 4530 | if (file->f_mode & FMODE_READ) { |
6484c71c | 4531 | iter = __tracing_open(inode, file, false); |
4acd4d00 SR |
4532 | if (IS_ERR(iter)) |
4533 | ret = PTR_ERR(iter); | |
983f938a | 4534 | else if (tr->trace_flags & TRACE_ITER_LATENCY_FMT) |
4acd4d00 SR |
4535 | iter->iter_flags |= TRACE_FILE_LAT_FMT; |
4536 | } | |
ff451961 SRRH |
4537 | |
4538 | if (ret < 0) | |
4539 | trace_array_put(tr); | |
4540 | ||
bc0c38d1 SR |
4541 | return ret; |
4542 | } | |
4543 | ||
607e2ea1 SRRH |
4544 | /* |
4545 | * Some tracers are not suitable for instance buffers. | |
4546 | * A tracer is always available for the global array (toplevel) | |
4547 | * or if it explicitly states that it is. | |
4548 | */ | |
4549 | static bool | |
4550 | trace_ok_for_array(struct tracer *t, struct trace_array *tr) | |
4551 | { | |
4552 | return (tr->flags & TRACE_ARRAY_FL_GLOBAL) || t->allow_instances; | |
4553 | } | |
4554 | ||
4555 | /* Find the next tracer that this trace array may use */ | |
4556 | static struct tracer * | |
4557 | get_tracer_for_array(struct trace_array *tr, struct tracer *t) | |
4558 | { | |
4559 | while (t && !trace_ok_for_array(t, tr)) | |
4560 | t = t->next; | |
4561 | ||
4562 | return t; | |
4563 | } | |
4564 | ||
e309b41d | 4565 | static void * |
bc0c38d1 SR |
4566 | t_next(struct seq_file *m, void *v, loff_t *pos) |
4567 | { | |
607e2ea1 | 4568 | struct trace_array *tr = m->private; |
f129e965 | 4569 | struct tracer *t = v; |
bc0c38d1 SR |
4570 | |
4571 | (*pos)++; | |
4572 | ||
4573 | if (t) | |
607e2ea1 | 4574 | t = get_tracer_for_array(tr, t->next); |
bc0c38d1 | 4575 | |
bc0c38d1 SR |
4576 | return t; |
4577 | } | |
4578 | ||
4579 | static void *t_start(struct seq_file *m, loff_t *pos) | |
4580 | { | |
607e2ea1 | 4581 | struct trace_array *tr = m->private; |
f129e965 | 4582 | struct tracer *t; |
bc0c38d1 SR |
4583 | loff_t l = 0; |
4584 | ||
4585 | mutex_lock(&trace_types_lock); | |
607e2ea1 SRRH |
4586 | |
4587 | t = get_tracer_for_array(tr, trace_types); | |
4588 | for (; t && l < *pos; t = t_next(m, t, &l)) | |
4589 | ; | |
bc0c38d1 SR |
4590 | |
4591 | return t; | |
4592 | } | |
4593 | ||
4594 | static void t_stop(struct seq_file *m, void *p) | |
4595 | { | |
4596 | mutex_unlock(&trace_types_lock); | |
4597 | } | |
4598 | ||
4599 | static int t_show(struct seq_file *m, void *v) | |
4600 | { | |
4601 | struct tracer *t = v; | |
4602 | ||
4603 | if (!t) | |
4604 | return 0; | |
4605 | ||
fa6f0cc7 | 4606 | seq_puts(m, t->name); |
bc0c38d1 SR |
4607 | if (t->next) |
4608 | seq_putc(m, ' '); | |
4609 | else | |
4610 | seq_putc(m, '\n'); | |
4611 | ||
4612 | return 0; | |
4613 | } | |
4614 | ||
88e9d34c | 4615 | static const struct seq_operations show_traces_seq_ops = { |
4bf39a94 IM |
4616 | .start = t_start, |
4617 | .next = t_next, | |
4618 | .stop = t_stop, | |
4619 | .show = t_show, | |
bc0c38d1 SR |
4620 | }; |
4621 | ||
4622 | static int show_traces_open(struct inode *inode, struct file *file) | |
4623 | { | |
607e2ea1 SRRH |
4624 | struct trace_array *tr = inode->i_private; |
4625 | struct seq_file *m; | |
4626 | int ret; | |
4627 | ||
8530dec6 SRV |
4628 | ret = tracing_check_open_get_tr(tr); |
4629 | if (ret) | |
4630 | return ret; | |
194c2c74 | 4631 | |
607e2ea1 | 4632 | ret = seq_open(file, &show_traces_seq_ops); |
194c2c74 SRV |
4633 | if (ret) { |
4634 | trace_array_put(tr); | |
607e2ea1 | 4635 | return ret; |
194c2c74 | 4636 | } |
607e2ea1 SRRH |
4637 | |
4638 | m = file->private_data; | |
4639 | m->private = tr; | |
4640 | ||
4641 | return 0; | |
bc0c38d1 SR |
4642 | } |
4643 | ||
194c2c74 SRV |
4644 | static int show_traces_release(struct inode *inode, struct file *file) |
4645 | { | |
4646 | struct trace_array *tr = inode->i_private; | |
4647 | ||
4648 | trace_array_put(tr); | |
4649 | return seq_release(inode, file); | |
4650 | } | |
4651 | ||
4acd4d00 SR |
4652 | static ssize_t |
4653 | tracing_write_stub(struct file *filp, const char __user *ubuf, | |
4654 | size_t count, loff_t *ppos) | |
4655 | { | |
4656 | return count; | |
4657 | } | |
4658 | ||
098c879e | 4659 | loff_t tracing_lseek(struct file *file, loff_t offset, int whence) |
364829b1 | 4660 | { |
098c879e SRRH |
4661 | int ret; |
4662 | ||
364829b1 | 4663 | if (file->f_mode & FMODE_READ) |
098c879e | 4664 | ret = seq_lseek(file, offset, whence); |
364829b1 | 4665 | else |
098c879e SRRH |
4666 | file->f_pos = ret = 0; |
4667 | ||
4668 | return ret; | |
364829b1 SP |
4669 | } |
4670 | ||
5e2336a0 | 4671 | static const struct file_operations tracing_fops = { |
4bf39a94 IM |
4672 | .open = tracing_open, |
4673 | .read = seq_read, | |
4acd4d00 | 4674 | .write = tracing_write_stub, |
098c879e | 4675 | .llseek = tracing_lseek, |
4bf39a94 | 4676 | .release = tracing_release, |
bc0c38d1 SR |
4677 | }; |
4678 | ||
5e2336a0 | 4679 | static const struct file_operations show_traces_fops = { |
c7078de1 IM |
4680 | .open = show_traces_open, |
4681 | .read = seq_read, | |
b444786f | 4682 | .llseek = seq_lseek, |
194c2c74 | 4683 | .release = show_traces_release, |
c7078de1 IM |
4684 | }; |
4685 | ||
4686 | static ssize_t | |
4687 | tracing_cpumask_read(struct file *filp, char __user *ubuf, | |
4688 | size_t count, loff_t *ppos) | |
4689 | { | |
ccfe9e42 | 4690 | struct trace_array *tr = file_inode(filp)->i_private; |
90e406f9 | 4691 | char *mask_str; |
36dfe925 | 4692 | int len; |
c7078de1 | 4693 | |
90e406f9 CD |
4694 | len = snprintf(NULL, 0, "%*pb\n", |
4695 | cpumask_pr_args(tr->tracing_cpumask)) + 1; | |
4696 | mask_str = kmalloc(len, GFP_KERNEL); | |
4697 | if (!mask_str) | |
4698 | return -ENOMEM; | |
36dfe925 | 4699 | |
90e406f9 | 4700 | len = snprintf(mask_str, len, "%*pb\n", |
1a40243b TH |
4701 | cpumask_pr_args(tr->tracing_cpumask)); |
4702 | if (len >= count) { | |
36dfe925 IM |
4703 | count = -EINVAL; |
4704 | goto out_err; | |
4705 | } | |
90e406f9 | 4706 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, len); |
36dfe925 IM |
4707 | |
4708 | out_err: | |
90e406f9 | 4709 | kfree(mask_str); |
c7078de1 IM |
4710 | |
4711 | return count; | |
4712 | } | |
4713 | ||
9d15dbbd MH |
4714 | int tracing_set_cpumask(struct trace_array *tr, |
4715 | cpumask_var_t tracing_cpumask_new) | |
c7078de1 | 4716 | { |
9d15dbbd | 4717 | int cpu; |
c7078de1 | 4718 | |
9d15dbbd MH |
4719 | if (!tr) |
4720 | return -EINVAL; | |
36dfe925 | 4721 | |
a5e25883 | 4722 | local_irq_disable(); |
0b9b12c1 | 4723 | arch_spin_lock(&tr->max_lock); |
ab46428c | 4724 | for_each_tracing_cpu(cpu) { |
36dfe925 IM |
4725 | /* |
4726 | * Increase/decrease the disabled counter if we are | |
4727 | * about to flip a bit in the cpumask: | |
4728 | */ | |
ccfe9e42 | 4729 | if (cpumask_test_cpu(cpu, tr->tracing_cpumask) && |
9e01c1b7 | 4730 | !cpumask_test_cpu(cpu, tracing_cpumask_new)) { |
1c5eb448 SRV |
4731 | atomic_inc(&per_cpu_ptr(tr->array_buffer.data, cpu)->disabled); |
4732 | ring_buffer_record_disable_cpu(tr->array_buffer.buffer, cpu); | |
36dfe925 | 4733 | } |
ccfe9e42 | 4734 | if (!cpumask_test_cpu(cpu, tr->tracing_cpumask) && |
9e01c1b7 | 4735 | cpumask_test_cpu(cpu, tracing_cpumask_new)) { |
1c5eb448 SRV |
4736 | atomic_dec(&per_cpu_ptr(tr->array_buffer.data, cpu)->disabled); |
4737 | ring_buffer_record_enable_cpu(tr->array_buffer.buffer, cpu); | |
36dfe925 IM |
4738 | } |
4739 | } | |
0b9b12c1 | 4740 | arch_spin_unlock(&tr->max_lock); |
a5e25883 | 4741 | local_irq_enable(); |
36dfe925 | 4742 | |
ccfe9e42 | 4743 | cpumask_copy(tr->tracing_cpumask, tracing_cpumask_new); |
9d15dbbd MH |
4744 | |
4745 | return 0; | |
4746 | } | |
4747 | ||
4748 | static ssize_t | |
4749 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, | |
4750 | size_t count, loff_t *ppos) | |
4751 | { | |
4752 | struct trace_array *tr = file_inode(filp)->i_private; | |
4753 | cpumask_var_t tracing_cpumask_new; | |
4754 | int err; | |
4755 | ||
4756 | if (!alloc_cpumask_var(&tracing_cpumask_new, GFP_KERNEL)) | |
4757 | return -ENOMEM; | |
4758 | ||
4759 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); | |
4760 | if (err) | |
4761 | goto err_free; | |
4762 | ||
4763 | err = tracing_set_cpumask(tr, tracing_cpumask_new); | |
4764 | if (err) | |
4765 | goto err_free; | |
4766 | ||
9e01c1b7 | 4767 | free_cpumask_var(tracing_cpumask_new); |
c7078de1 IM |
4768 | |
4769 | return count; | |
36dfe925 | 4770 | |
9d15dbbd | 4771 | err_free: |
215368e8 | 4772 | free_cpumask_var(tracing_cpumask_new); |
36dfe925 IM |
4773 | |
4774 | return err; | |
c7078de1 IM |
4775 | } |
4776 | ||
5e2336a0 | 4777 | static const struct file_operations tracing_cpumask_fops = { |
ccfe9e42 | 4778 | .open = tracing_open_generic_tr, |
c7078de1 IM |
4779 | .read = tracing_cpumask_read, |
4780 | .write = tracing_cpumask_write, | |
ccfe9e42 | 4781 | .release = tracing_release_generic_tr, |
b444786f | 4782 | .llseek = generic_file_llseek, |
bc0c38d1 SR |
4783 | }; |
4784 | ||
fdb372ed | 4785 | static int tracing_trace_options_show(struct seq_file *m, void *v) |
bc0c38d1 | 4786 | { |
d8e83d26 | 4787 | struct tracer_opt *trace_opts; |
2b6080f2 | 4788 | struct trace_array *tr = m->private; |
d8e83d26 | 4789 | u32 tracer_flags; |
d8e83d26 | 4790 | int i; |
adf9f195 | 4791 | |
d8e83d26 | 4792 | mutex_lock(&trace_types_lock); |
2b6080f2 SR |
4793 | tracer_flags = tr->current_trace->flags->val; |
4794 | trace_opts = tr->current_trace->flags->opts; | |
d8e83d26 | 4795 | |
bc0c38d1 | 4796 | for (i = 0; trace_options[i]; i++) { |
983f938a | 4797 | if (tr->trace_flags & (1 << i)) |
fdb372ed | 4798 | seq_printf(m, "%s\n", trace_options[i]); |
bc0c38d1 | 4799 | else |
fdb372ed | 4800 | seq_printf(m, "no%s\n", trace_options[i]); |
bc0c38d1 SR |
4801 | } |
4802 | ||
adf9f195 FW |
4803 | for (i = 0; trace_opts[i].name; i++) { |
4804 | if (tracer_flags & trace_opts[i].bit) | |
fdb372ed | 4805 | seq_printf(m, "%s\n", trace_opts[i].name); |
adf9f195 | 4806 | else |
fdb372ed | 4807 | seq_printf(m, "no%s\n", trace_opts[i].name); |
adf9f195 | 4808 | } |
d8e83d26 | 4809 | mutex_unlock(&trace_types_lock); |
adf9f195 | 4810 | |
fdb372ed | 4811 | return 0; |
bc0c38d1 | 4812 | } |
bc0c38d1 | 4813 | |
8c1a49ae | 4814 | static int __set_tracer_option(struct trace_array *tr, |
8d18eaaf LZ |
4815 | struct tracer_flags *tracer_flags, |
4816 | struct tracer_opt *opts, int neg) | |
4817 | { | |
d39cdd20 | 4818 | struct tracer *trace = tracer_flags->trace; |
8d18eaaf | 4819 | int ret; |
bc0c38d1 | 4820 | |
8c1a49ae | 4821 | ret = trace->set_flag(tr, tracer_flags->val, opts->bit, !neg); |
8d18eaaf LZ |
4822 | if (ret) |
4823 | return ret; | |
4824 | ||
4825 | if (neg) | |
4826 | tracer_flags->val &= ~opts->bit; | |
4827 | else | |
4828 | tracer_flags->val |= opts->bit; | |
4829 | return 0; | |
bc0c38d1 SR |
4830 | } |
4831 | ||
adf9f195 | 4832 | /* Try to assign a tracer specific option */ |
8c1a49ae | 4833 | static int set_tracer_option(struct trace_array *tr, char *cmp, int neg) |
adf9f195 | 4834 | { |
8c1a49ae | 4835 | struct tracer *trace = tr->current_trace; |
7770841e | 4836 | struct tracer_flags *tracer_flags = trace->flags; |
adf9f195 | 4837 | struct tracer_opt *opts = NULL; |
8d18eaaf | 4838 | int i; |
adf9f195 | 4839 | |
7770841e Z |
4840 | for (i = 0; tracer_flags->opts[i].name; i++) { |
4841 | opts = &tracer_flags->opts[i]; | |
adf9f195 | 4842 | |
8d18eaaf | 4843 | if (strcmp(cmp, opts->name) == 0) |
8c1a49ae | 4844 | return __set_tracer_option(tr, trace->flags, opts, neg); |
adf9f195 | 4845 | } |
adf9f195 | 4846 | |
8d18eaaf | 4847 | return -EINVAL; |
adf9f195 FW |
4848 | } |
4849 | ||
613f04a0 SRRH |
4850 | /* Some tracers require overwrite to stay enabled */ |
4851 | int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set) | |
4852 | { | |
4853 | if (tracer->enabled && (mask & TRACE_ITER_OVERWRITE) && !set) | |
4854 | return -1; | |
4855 | ||
4856 | return 0; | |
4857 | } | |
4858 | ||
2b6080f2 | 4859 | int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled) |
af4617bd | 4860 | { |
3a53acf1 PS |
4861 | if ((mask == TRACE_ITER_RECORD_TGID) || |
4862 | (mask == TRACE_ITER_RECORD_CMD)) | |
4863 | lockdep_assert_held(&event_mutex); | |
4864 | ||
af4617bd | 4865 | /* do nothing if flag is already set */ |
983f938a | 4866 | if (!!(tr->trace_flags & mask) == !!enabled) |
613f04a0 SRRH |
4867 | return 0; |
4868 | ||
4869 | /* Give the tracer a chance to approve the change */ | |
2b6080f2 | 4870 | if (tr->current_trace->flag_changed) |
bf6065b5 | 4871 | if (tr->current_trace->flag_changed(tr, mask, !!enabled)) |
613f04a0 | 4872 | return -EINVAL; |
af4617bd SR |
4873 | |
4874 | if (enabled) | |
983f938a | 4875 | tr->trace_flags |= mask; |
af4617bd | 4876 | else |
983f938a | 4877 | tr->trace_flags &= ~mask; |
e870e9a1 LZ |
4878 | |
4879 | if (mask == TRACE_ITER_RECORD_CMD) | |
4880 | trace_event_enable_cmd_record(enabled); | |
750912fa | 4881 | |
d914ba37 JF |
4882 | if (mask == TRACE_ITER_RECORD_TGID) { |
4883 | if (!tgid_map) | |
6ee40511 | 4884 | tgid_map = kvcalloc(PID_MAX_DEFAULT + 1, |
6396bb22 | 4885 | sizeof(*tgid_map), |
d914ba37 JF |
4886 | GFP_KERNEL); |
4887 | if (!tgid_map) { | |
4888 | tr->trace_flags &= ~TRACE_ITER_RECORD_TGID; | |
4889 | return -ENOMEM; | |
4890 | } | |
4891 | ||
4892 | trace_event_enable_tgid_record(enabled); | |
4893 | } | |
4894 | ||
c37775d5 SR |
4895 | if (mask == TRACE_ITER_EVENT_FORK) |
4896 | trace_event_follow_fork(tr, enabled); | |
4897 | ||
1e10486f NK |
4898 | if (mask == TRACE_ITER_FUNC_FORK) |
4899 | ftrace_pid_follow_fork(tr, enabled); | |
4900 | ||
80902822 | 4901 | if (mask == TRACE_ITER_OVERWRITE) { |
1c5eb448 | 4902 | ring_buffer_change_overwrite(tr->array_buffer.buffer, enabled); |
80902822 | 4903 | #ifdef CONFIG_TRACER_MAX_TRACE |
12883efb | 4904 | ring_buffer_change_overwrite(tr->max_buffer.buffer, enabled); |
80902822 SRRH |
4905 | #endif |
4906 | } | |
81698831 | 4907 | |
b9f9108c | 4908 | if (mask == TRACE_ITER_PRINTK) { |
81698831 | 4909 | trace_printk_start_stop_comm(enabled); |
b9f9108c SRRH |
4910 | trace_printk_control(enabled); |
4911 | } | |
613f04a0 SRRH |
4912 | |
4913 | return 0; | |
af4617bd SR |
4914 | } |
4915 | ||
9c5b9d3d | 4916 | int trace_set_options(struct trace_array *tr, char *option) |
bc0c38d1 | 4917 | { |
8d18eaaf | 4918 | char *cmp; |
bc0c38d1 | 4919 | int neg = 0; |
591a033d | 4920 | int ret; |
a4d1e688 | 4921 | size_t orig_len = strlen(option); |
3d739c1f | 4922 | int len; |
bc0c38d1 | 4923 | |
7bcfaf54 | 4924 | cmp = strstrip(option); |
bc0c38d1 | 4925 | |
3d739c1f SRV |
4926 | len = str_has_prefix(cmp, "no"); |
4927 | if (len) | |
bc0c38d1 | 4928 | neg = 1; |
3d739c1f SRV |
4929 | |
4930 | cmp += len; | |
bc0c38d1 | 4931 | |
3a53acf1 | 4932 | mutex_lock(&event_mutex); |
69d34da2 SRRH |
4933 | mutex_lock(&trace_types_lock); |
4934 | ||
591a033d | 4935 | ret = match_string(trace_options, -1, cmp); |
adf9f195 | 4936 | /* If no option could be set, test the specific tracer options */ |
591a033d | 4937 | if (ret < 0) |
8c1a49ae | 4938 | ret = set_tracer_option(tr, cmp, neg); |
591a033d YX |
4939 | else |
4940 | ret = set_tracer_flag(tr, 1 << ret, !neg); | |
69d34da2 SRRH |
4941 | |
4942 | mutex_unlock(&trace_types_lock); | |
3a53acf1 | 4943 | mutex_unlock(&event_mutex); |
bc0c38d1 | 4944 | |
a4d1e688 JW |
4945 | /* |
4946 | * If the first trailing whitespace is replaced with '\0' by strstrip, | |
4947 | * turn it back into a space. | |
4948 | */ | |
4949 | if (orig_len > strlen(option)) | |
4950 | option[strlen(option)] = ' '; | |
4951 | ||
7bcfaf54 SR |
4952 | return ret; |
4953 | } | |
4954 | ||
a4d1e688 JW |
4955 | static void __init apply_trace_boot_options(void) |
4956 | { | |
4957 | char *buf = trace_boot_options_buf; | |
4958 | char *option; | |
4959 | ||
4960 | while (true) { | |
4961 | option = strsep(&buf, ","); | |
4962 | ||
4963 | if (!option) | |
4964 | break; | |
a4d1e688 | 4965 | |
43ed3843 SRRH |
4966 | if (*option) |
4967 | trace_set_options(&global_trace, option); | |
a4d1e688 JW |
4968 | |
4969 | /* Put back the comma to allow this to be called again */ | |
4970 | if (buf) | |
4971 | *(buf - 1) = ','; | |
4972 | } | |
4973 | } | |
4974 | ||
7bcfaf54 SR |
4975 | static ssize_t |
4976 | tracing_trace_options_write(struct file *filp, const char __user *ubuf, | |
4977 | size_t cnt, loff_t *ppos) | |
4978 | { | |
2b6080f2 SR |
4979 | struct seq_file *m = filp->private_data; |
4980 | struct trace_array *tr = m->private; | |
7bcfaf54 | 4981 | char buf[64]; |
613f04a0 | 4982 | int ret; |
7bcfaf54 SR |
4983 | |
4984 | if (cnt >= sizeof(buf)) | |
4985 | return -EINVAL; | |
4986 | ||
4afe6495 | 4987 | if (copy_from_user(buf, ubuf, cnt)) |
7bcfaf54 SR |
4988 | return -EFAULT; |
4989 | ||
a8dd2176 SR |
4990 | buf[cnt] = 0; |
4991 | ||
2b6080f2 | 4992 | ret = trace_set_options(tr, buf); |
613f04a0 SRRH |
4993 | if (ret < 0) |
4994 | return ret; | |
7bcfaf54 | 4995 | |
cf8517cf | 4996 | *ppos += cnt; |
bc0c38d1 SR |
4997 | |
4998 | return cnt; | |
4999 | } | |
5000 | ||
fdb372ed LZ |
5001 | static int tracing_trace_options_open(struct inode *inode, struct file *file) |
5002 | { | |
7b85af63 | 5003 | struct trace_array *tr = inode->i_private; |
f77d09a3 | 5004 | int ret; |
7b85af63 | 5005 | |
8530dec6 SRV |
5006 | ret = tracing_check_open_get_tr(tr); |
5007 | if (ret) | |
5008 | return ret; | |
7b85af63 | 5009 | |
f77d09a3 AL |
5010 | ret = single_open(file, tracing_trace_options_show, inode->i_private); |
5011 | if (ret < 0) | |
5012 | trace_array_put(tr); | |
5013 | ||
5014 | return ret; | |
fdb372ed LZ |
5015 | } |
5016 | ||
5e2336a0 | 5017 | static const struct file_operations tracing_iter_fops = { |
fdb372ed LZ |
5018 | .open = tracing_trace_options_open, |
5019 | .read = seq_read, | |
5020 | .llseek = seq_lseek, | |
7b85af63 | 5021 | .release = tracing_single_release_tr, |
ee6bce52 | 5022 | .write = tracing_trace_options_write, |
bc0c38d1 SR |
5023 | }; |
5024 | ||
7bd2f24c IM |
5025 | static const char readme_msg[] = |
5026 | "tracing mini-HOWTO:\n\n" | |
22f45649 SRRH |
5027 | "# echo 0 > tracing_on : quick way to disable tracing\n" |
5028 | "# echo 1 > tracing_on : quick way to re-enable tracing\n\n" | |
5029 | " Important files:\n" | |
5030 | " trace\t\t\t- The static contents of the buffer\n" | |
5031 | "\t\t\t To clear the buffer write into this file: echo > trace\n" | |
5032 | " trace_pipe\t\t- A consuming read to see the contents of the buffer\n" | |
5033 | " current_tracer\t- function and latency tracers\n" | |
5034 | " available_tracers\t- list of configured tracers for current_tracer\n" | |
a8d65579 | 5035 | " error_log\t- error log for failed commands (that support it)\n" |
22f45649 SRRH |
5036 | " buffer_size_kb\t- view and modify size of per cpu buffer\n" |
5037 | " buffer_total_size_kb - view total size of all cpu buffers\n\n" | |
5038 | " trace_clock\t\t-change the clock used to order events\n" | |
5039 | " local: Per cpu clock but may not be synced across CPUs\n" | |
5040 | " global: Synced across CPUs but slows tracing down.\n" | |
5041 | " counter: Not a clock, but just an increment\n" | |
5042 | " uptime: Jiffy counter from time of boot\n" | |
5043 | " perf: Same clock that perf events use\n" | |
5044 | #ifdef CONFIG_X86_64 | |
5045 | " x86-tsc: TSC cycle counter\n" | |
5046 | #endif | |
2c1ea60b TZ |
5047 | "\n timestamp_mode\t-view the mode used to timestamp events\n" |
5048 | " delta: Delta difference against a buffer-wide timestamp\n" | |
5049 | " absolute: Absolute (standalone) timestamp\n" | |
22f45649 | 5050 | "\n trace_marker\t\t- Writes into this file writes into the kernel buffer\n" |
fa32e855 | 5051 | "\n trace_marker_raw\t\t- Writes into this file writes binary data into the kernel buffer\n" |
22f45649 SRRH |
5052 | " tracing_cpumask\t- Limit which CPUs to trace\n" |
5053 | " instances\t\t- Make sub-buffers with: mkdir instances/foo\n" | |
5054 | "\t\t\t Remove sub-buffer with rmdir\n" | |
5055 | " trace_options\t\t- Set format or modify how tracing happens\n" | |
b9416997 | 5056 | "\t\t\t Disable an option by prefixing 'no' to the\n" |
71485c45 | 5057 | "\t\t\t option name\n" |
939c7a4f | 5058 | " saved_cmdlines_size\t- echo command number in here to store comm-pid list\n" |
22f45649 SRRH |
5059 | #ifdef CONFIG_DYNAMIC_FTRACE |
5060 | "\n available_filter_functions - list of functions that can be filtered on\n" | |
71485c45 SRRH |
5061 | " set_ftrace_filter\t- echo function name in here to only trace these\n" |
5062 | "\t\t\t functions\n" | |
60f1d5e3 | 5063 | "\t accepts: func_full_name or glob-matching-pattern\n" |
71485c45 SRRH |
5064 | "\t modules: Can select a group via module\n" |
5065 | "\t Format: :mod:<module-name>\n" | |
5066 | "\t example: echo :mod:ext3 > set_ftrace_filter\n" | |
5067 | "\t triggers: a command to perform when function is hit\n" | |
5068 | "\t Format: <function>:<trigger>[:count]\n" | |
5069 | "\t trigger: traceon, traceoff\n" | |
5070 | "\t\t enable_event:<system>:<event>\n" | |
5071 | "\t\t disable_event:<system>:<event>\n" | |
22f45649 | 5072 | #ifdef CONFIG_STACKTRACE |
71485c45 | 5073 | "\t\t stacktrace\n" |
22f45649 SRRH |
5074 | #endif |
5075 | #ifdef CONFIG_TRACER_SNAPSHOT | |
71485c45 | 5076 | "\t\t snapshot\n" |
22f45649 | 5077 | #endif |
17a280ea SRRH |
5078 | "\t\t dump\n" |
5079 | "\t\t cpudump\n" | |
71485c45 SRRH |
5080 | "\t example: echo do_fault:traceoff > set_ftrace_filter\n" |
5081 | "\t echo do_trap:traceoff:3 > set_ftrace_filter\n" | |
5082 | "\t The first one will disable tracing every time do_fault is hit\n" | |
5083 | "\t The second will disable tracing at most 3 times when do_trap is hit\n" | |
5084 | "\t The first time do trap is hit and it disables tracing, the\n" | |
5085 | "\t counter will decrement to 2. If tracing is already disabled,\n" | |
5086 | "\t the counter will not decrement. It only decrements when the\n" | |
5087 | "\t trigger did work\n" | |
5088 | "\t To remove trigger without count:\n" | |
5089 | "\t echo '!<function>:<trigger> > set_ftrace_filter\n" | |
5090 | "\t To remove trigger with a count:\n" | |
5091 | "\t echo '!<function>:<trigger>:0 > set_ftrace_filter\n" | |
22f45649 | 5092 | " set_ftrace_notrace\t- echo function name in here to never trace.\n" |
71485c45 SRRH |
5093 | "\t accepts: func_full_name, *func_end, func_begin*, *func_middle*\n" |
5094 | "\t modules: Can select a group via module command :mod:\n" | |
5095 | "\t Does not accept triggers\n" | |
22f45649 SRRH |
5096 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
5097 | #ifdef CONFIG_FUNCTION_TRACER | |
71485c45 SRRH |
5098 | " set_ftrace_pid\t- Write pid(s) to only function trace those pids\n" |
5099 | "\t\t (function)\n" | |
b3b1e6ed SRV |
5100 | " set_ftrace_notrace_pid\t- Write pid(s) to not function trace those pids\n" |
5101 | "\t\t (function)\n" | |
22f45649 SRRH |
5102 | #endif |
5103 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
5104 | " set_graph_function\t- Trace the nested calls of a function (function_graph)\n" | |
d048a8c7 | 5105 | " set_graph_notrace\t- Do not trace the nested calls of a function (function_graph)\n" |
22f45649 SRRH |
5106 | " max_graph_depth\t- Trace a limited depth of nested calls (0 is unlimited)\n" |
5107 | #endif | |
5108 | #ifdef CONFIG_TRACER_SNAPSHOT | |
71485c45 SRRH |
5109 | "\n snapshot\t\t- Like 'trace' but shows the content of the static\n" |
5110 | "\t\t\t snapshot buffer. Read the contents for more\n" | |
5111 | "\t\t\t information\n" | |
22f45649 | 5112 | #endif |
991821c8 | 5113 | #ifdef CONFIG_STACK_TRACER |
22f45649 SRRH |
5114 | " stack_trace\t\t- Shows the max stack trace when active\n" |
5115 | " stack_max_size\t- Shows current max stack size that was traced\n" | |
71485c45 SRRH |
5116 | "\t\t\t Write into this file to reset the max size (trigger a\n" |
5117 | "\t\t\t new trace)\n" | |
22f45649 | 5118 | #ifdef CONFIG_DYNAMIC_FTRACE |
71485c45 SRRH |
5119 | " stack_trace_filter\t- Like set_ftrace_filter but limits what stack_trace\n" |
5120 | "\t\t\t traces\n" | |
22f45649 | 5121 | #endif |
991821c8 | 5122 | #endif /* CONFIG_STACK_TRACER */ |
5448d44c | 5123 | #ifdef CONFIG_DYNAMIC_EVENTS |
ca89bc07 | 5124 | " dynamic_events\t\t- Create/append/remove/show the generic dynamic events\n" |
5448d44c MH |
5125 | "\t\t\t Write into this file to define/undefine new trace events.\n" |
5126 | #endif | |
6b0b7551 | 5127 | #ifdef CONFIG_KPROBE_EVENTS |
ca89bc07 | 5128 | " kprobe_events\t\t- Create/append/remove/show the kernel dynamic events\n" |
86425625 MH |
5129 | "\t\t\t Write into this file to define/undefine new trace events.\n" |
5130 | #endif | |
6b0b7551 | 5131 | #ifdef CONFIG_UPROBE_EVENTS |
41af3cf5 | 5132 | " uprobe_events\t\t- Create/append/remove/show the userspace dynamic events\n" |
86425625 MH |
5133 | "\t\t\t Write into this file to define/undefine new trace events.\n" |
5134 | #endif | |
6b0b7551 | 5135 | #if defined(CONFIG_KPROBE_EVENTS) || defined(CONFIG_UPROBE_EVENTS) |
86425625 | 5136 | "\t accepts: event-definitions (one definition per line)\n" |
c3ca46ef MH |
5137 | "\t Format: p[:[<group>/]<event>] <place> [<args>]\n" |
5138 | "\t r[maxactive][:[<group>/]<event>] <place> [<args>]\n" | |
7bbab38d MH |
5139 | #ifdef CONFIG_HIST_TRIGGERS |
5140 | "\t s:[synthetic/]<event> <field> [<field>]\n" | |
5141 | #endif | |
86425625 | 5142 | "\t -:[<group>/]<event>\n" |
6b0b7551 | 5143 | #ifdef CONFIG_KPROBE_EVENTS |
86425625 | 5144 | "\t place: [<module>:]<symbol>[+<offset>]|<memaddr>\n" |
4725cd89 | 5145 | "place (kretprobe): [<module>:]<symbol>[+<offset>]%return|<memaddr>\n" |
86425625 | 5146 | #endif |
6b0b7551 | 5147 | #ifdef CONFIG_UPROBE_EVENTS |
3dd3aae3 | 5148 | " place (uprobe): <path>:<offset>[%return][(ref_ctr_offset)]\n" |
86425625 MH |
5149 | #endif |
5150 | "\t args: <name>=fetcharg[:type]\n" | |
5151 | "\t fetcharg: %<register>, @<address>, @<symbol>[+|-<offset>],\n" | |
a1303af5 | 5152 | #ifdef CONFIG_HAVE_FUNCTION_ARG_ACCESS_API |
e65f7ae7 | 5153 | "\t $stack<index>, $stack, $retval, $comm, $arg<N>,\n" |
a1303af5 | 5154 | #else |
e65f7ae7 | 5155 | "\t $stack<index>, $stack, $retval, $comm,\n" |
a1303af5 | 5156 | #endif |
a42e3c4d | 5157 | "\t +|-[u]<offset>(<fetcharg>), \\imm-value, \\\"imm-string\"\n" |
60c2e0ce | 5158 | "\t type: s8/16/32/64, u8/16/32/64, x8/16/32/64, string, symbol,\n" |
88903c46 | 5159 | "\t b<bit-width>@<bit-offset>/<container-size>, ustring,\n" |
40b53b77 | 5160 | "\t <type>\\[<array-size>\\]\n" |
7bbab38d MH |
5161 | #ifdef CONFIG_HIST_TRIGGERS |
5162 | "\t field: <stype> <name>;\n" | |
5163 | "\t stype: u8/u16/u32/u64, s8/s16/s32/s64, pid_t,\n" | |
5164 | "\t [unsigned] char/int/long\n" | |
5165 | #endif | |
86425625 | 5166 | #endif |
26f25564 TZ |
5167 | " events/\t\t- Directory containing all trace event subsystems:\n" |
5168 | " enable\t\t- Write 0/1 to enable/disable tracing of all events\n" | |
5169 | " events/<system>/\t- Directory containing all trace events for <system>:\n" | |
71485c45 SRRH |
5170 | " enable\t\t- Write 0/1 to enable/disable tracing of all <system>\n" |
5171 | "\t\t\t events\n" | |
26f25564 | 5172 | " filter\t\t- If set, only events passing filter are traced\n" |
71485c45 SRRH |
5173 | " events/<system>/<event>/\t- Directory containing control files for\n" |
5174 | "\t\t\t <event>:\n" | |
26f25564 TZ |
5175 | " enable\t\t- Write 0/1 to enable/disable tracing of <event>\n" |
5176 | " filter\t\t- If set, only events passing filter are traced\n" | |
5177 | " trigger\t\t- If set, a command to perform when event is hit\n" | |
71485c45 SRRH |
5178 | "\t Format: <trigger>[:count][if <filter>]\n" |
5179 | "\t trigger: traceon, traceoff\n" | |
5180 | "\t enable_event:<system>:<event>\n" | |
5181 | "\t disable_event:<system>:<event>\n" | |
d0bad49b TZ |
5182 | #ifdef CONFIG_HIST_TRIGGERS |
5183 | "\t enable_hist:<system>:<event>\n" | |
5184 | "\t disable_hist:<system>:<event>\n" | |
5185 | #endif | |
26f25564 | 5186 | #ifdef CONFIG_STACKTRACE |
71485c45 | 5187 | "\t\t stacktrace\n" |
26f25564 TZ |
5188 | #endif |
5189 | #ifdef CONFIG_TRACER_SNAPSHOT | |
71485c45 | 5190 | "\t\t snapshot\n" |
7ef224d1 TZ |
5191 | #endif |
5192 | #ifdef CONFIG_HIST_TRIGGERS | |
5193 | "\t\t hist (see below)\n" | |
26f25564 | 5194 | #endif |
71485c45 SRRH |
5195 | "\t example: echo traceoff > events/block/block_unplug/trigger\n" |
5196 | "\t echo traceoff:3 > events/block/block_unplug/trigger\n" | |
5197 | "\t echo 'enable_event:kmem:kmalloc:3 if nr_rq > 1' > \\\n" | |
5198 | "\t events/block/block_unplug/trigger\n" | |
5199 | "\t The first disables tracing every time block_unplug is hit.\n" | |
5200 | "\t The second disables tracing the first 3 times block_unplug is hit.\n" | |
5201 | "\t The third enables the kmalloc event the first 3 times block_unplug\n" | |
5202 | "\t is hit and has value of greater than 1 for the 'nr_rq' event field.\n" | |
5203 | "\t Like function triggers, the counter is only decremented if it\n" | |
5204 | "\t enabled or disabled tracing.\n" | |
5205 | "\t To remove a trigger without a count:\n" | |
5206 | "\t echo '!<trigger> > <system>/<event>/trigger\n" | |
5207 | "\t To remove a trigger with a count:\n" | |
5208 | "\t echo '!<trigger>:0 > <system>/<event>/trigger\n" | |
5209 | "\t Filters can be ignored when removing a trigger.\n" | |
7ef224d1 TZ |
5210 | #ifdef CONFIG_HIST_TRIGGERS |
5211 | " hist trigger\t- If set, event hits are aggregated into a hash table\n" | |
76a3b0c8 | 5212 | "\t Format: hist:keys=<field1[,field2,...]>\n" |
f2606835 | 5213 | "\t [:values=<field1[,field2,...]>]\n" |
e62347d2 | 5214 | "\t [:sort=<field1[,field2,...]>]\n" |
7ef224d1 | 5215 | "\t [:size=#entries]\n" |
e86ae9ba | 5216 | "\t [:pause][:continue][:clear]\n" |
5463bfda | 5217 | "\t [:name=histname1]\n" |
c3e49506 | 5218 | "\t [:<handler>.<action>]\n" |
7ef224d1 TZ |
5219 | "\t [if <filter>]\n\n" |
5220 | "\t When a matching event is hit, an entry is added to a hash\n" | |
f2606835 TZ |
5221 | "\t table using the key(s) and value(s) named, and the value of a\n" |
5222 | "\t sum called 'hitcount' is incremented. Keys and values\n" | |
5223 | "\t correspond to fields in the event's format description. Keys\n" | |
69a0200c TZ |
5224 | "\t can be any field, or the special string 'stacktrace'.\n" |
5225 | "\t Compound keys consisting of up to two fields can be specified\n" | |
5226 | "\t by the 'keys' keyword. Values must correspond to numeric\n" | |
5227 | "\t fields. Sort keys consisting of up to two fields can be\n" | |
5228 | "\t specified using the 'sort' keyword. The sort direction can\n" | |
5229 | "\t be modified by appending '.descending' or '.ascending' to a\n" | |
5230 | "\t sort field. The 'size' parameter can be used to specify more\n" | |
5463bfda TZ |
5231 | "\t or fewer than the default 2048 entries for the hashtable size.\n" |
5232 | "\t If a hist trigger is given a name using the 'name' parameter,\n" | |
5233 | "\t its histogram data will be shared with other triggers of the\n" | |
5234 | "\t same name, and trigger hits will update this common data.\n\n" | |
7ef224d1 | 5235 | "\t Reading the 'hist' file for the event will dump the hash\n" |
52a7f16d TZ |
5236 | "\t table in its entirety to stdout. If there are multiple hist\n" |
5237 | "\t triggers attached to an event, there will be a table for each\n" | |
5463bfda TZ |
5238 | "\t trigger in the output. The table displayed for a named\n" |
5239 | "\t trigger will be the same as any other instance having the\n" | |
5240 | "\t same name. The default format used to display a given field\n" | |
5241 | "\t can be modified by appending any of the following modifiers\n" | |
5242 | "\t to the field name, as applicable:\n\n" | |
c6afad49 TZ |
5243 | "\t .hex display a number as a hex value\n" |
5244 | "\t .sym display an address as a symbol\n" | |
6b4827ad | 5245 | "\t .sym-offset display an address as a symbol and offset\n" |
31696198 | 5246 | "\t .execname display a common_pid as a program name\n" |
860f9f6b TZ |
5247 | "\t .syscall display a syscall id as a syscall name\n" |
5248 | "\t .log2 display log2 value rather than raw number\n" | |
5249 | "\t .usecs display a common_timestamp in microseconds\n\n" | |
83e99914 TZ |
5250 | "\t The 'pause' parameter can be used to pause an existing hist\n" |
5251 | "\t trigger or to start a hist trigger but not log any events\n" | |
5252 | "\t until told to do so. 'continue' can be used to start or\n" | |
5253 | "\t restart a paused hist trigger.\n\n" | |
e86ae9ba TZ |
5254 | "\t The 'clear' parameter will clear the contents of a running\n" |
5255 | "\t hist trigger and leave its current paused/active state\n" | |
5256 | "\t unchanged.\n\n" | |
d0bad49b TZ |
5257 | "\t The enable_hist and disable_hist triggers can be used to\n" |
5258 | "\t have one event conditionally start and stop another event's\n" | |
9e5a36a3 | 5259 | "\t already-attached hist trigger. The syntax is analogous to\n" |
c3e49506 TZ |
5260 | "\t the enable_event and disable_event triggers.\n\n" |
5261 | "\t Hist trigger handlers and actions are executed whenever a\n" | |
5262 | "\t a histogram entry is added or updated. They take the form:\n\n" | |
5263 | "\t <handler>.<action>\n\n" | |
5264 | "\t The available handlers are:\n\n" | |
5265 | "\t onmatch(matching.event) - invoke on addition or update\n" | |
dff81f55 TZ |
5266 | "\t onmax(var) - invoke if var exceeds current max\n" |
5267 | "\t onchange(var) - invoke action if var changes\n\n" | |
c3e49506 | 5268 | "\t The available actions are:\n\n" |
e91eefd7 | 5269 | "\t trace(<synthetic_event>,param list) - generate synthetic event\n" |
c3e49506 | 5270 | "\t save(field,...) - save current event fields\n" |
a3785b7e | 5271 | #ifdef CONFIG_TRACER_SNAPSHOT |
1bc36bd4 TZ |
5272 | "\t snapshot() - snapshot the trace buffer\n\n" |
5273 | #endif | |
5274 | #ifdef CONFIG_SYNTH_EVENTS | |
5275 | " events/synthetic_events\t- Create/append/remove/show synthetic events\n" | |
5276 | "\t Write into this file to define/undefine new synthetic events.\n" | |
5277 | "\t example: echo 'myevent u64 lat; char name[]' >> synthetic_events\n" | |
a3785b7e | 5278 | #endif |
7ef224d1 | 5279 | #endif |
7bd2f24c IM |
5280 | ; |
5281 | ||
5282 | static ssize_t | |
5283 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
5284 | size_t cnt, loff_t *ppos) | |
5285 | { | |
5286 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
5287 | readme_msg, strlen(readme_msg)); | |
5288 | } | |
5289 | ||
5e2336a0 | 5290 | static const struct file_operations tracing_readme_fops = { |
c7078de1 IM |
5291 | .open = tracing_open_generic, |
5292 | .read = tracing_readme_read, | |
b444786f | 5293 | .llseek = generic_file_llseek, |
7bd2f24c IM |
5294 | }; |
5295 | ||
99c621d7 MS |
5296 | static void *saved_tgids_next(struct seq_file *m, void *v, loff_t *pos) |
5297 | { | |
5298 | int *ptr = v; | |
5299 | ||
5300 | if (*pos || m->count) | |
5301 | ptr++; | |
5302 | ||
5303 | (*pos)++; | |
5304 | ||
5305 | for (; ptr <= &tgid_map[PID_MAX_DEFAULT]; ptr++) { | |
5306 | if (trace_find_tgid(*ptr)) | |
5307 | return ptr; | |
5308 | } | |
5309 | ||
5310 | return NULL; | |
5311 | } | |
5312 | ||
5313 | static void *saved_tgids_start(struct seq_file *m, loff_t *pos) | |
5314 | { | |
5315 | void *v; | |
5316 | loff_t l = 0; | |
5317 | ||
5318 | if (!tgid_map) | |
5319 | return NULL; | |
5320 | ||
5321 | v = &tgid_map[0]; | |
5322 | while (l <= *pos) { | |
5323 | v = saved_tgids_next(m, v, &l); | |
5324 | if (!v) | |
5325 | return NULL; | |
5326 | } | |
5327 | ||
5328 | return v; | |
5329 | } | |
5330 | ||
5331 | static void saved_tgids_stop(struct seq_file *m, void *v) | |
5332 | { | |
5333 | } | |
5334 | ||
5335 | static int saved_tgids_show(struct seq_file *m, void *v) | |
5336 | { | |
5337 | int pid = (int *)v - tgid_map; | |
5338 | ||
5339 | seq_printf(m, "%d %d\n", pid, trace_find_tgid(pid)); | |
5340 | return 0; | |
5341 | } | |
5342 | ||
5343 | static const struct seq_operations tracing_saved_tgids_seq_ops = { | |
5344 | .start = saved_tgids_start, | |
5345 | .stop = saved_tgids_stop, | |
5346 | .next = saved_tgids_next, | |
5347 | .show = saved_tgids_show, | |
5348 | }; | |
5349 | ||
5350 | static int tracing_saved_tgids_open(struct inode *inode, struct file *filp) | |
5351 | { | |
8530dec6 SRV |
5352 | int ret; |
5353 | ||
5354 | ret = tracing_check_open_get_tr(NULL); | |
5355 | if (ret) | |
5356 | return ret; | |
99c621d7 MS |
5357 | |
5358 | return seq_open(filp, &tracing_saved_tgids_seq_ops); | |
5359 | } | |
5360 | ||
5361 | ||
5362 | static const struct file_operations tracing_saved_tgids_fops = { | |
5363 | .open = tracing_saved_tgids_open, | |
5364 | .read = seq_read, | |
5365 | .llseek = seq_lseek, | |
5366 | .release = seq_release, | |
5367 | }; | |
5368 | ||
42584c81 YY |
5369 | static void *saved_cmdlines_next(struct seq_file *m, void *v, loff_t *pos) |
5370 | { | |
5371 | unsigned int *ptr = v; | |
69abe6a5 | 5372 | |
42584c81 YY |
5373 | if (*pos || m->count) |
5374 | ptr++; | |
69abe6a5 | 5375 | |
42584c81 | 5376 | (*pos)++; |
69abe6a5 | 5377 | |
939c7a4f YY |
5378 | for (; ptr < &savedcmd->map_cmdline_to_pid[savedcmd->cmdline_num]; |
5379 | ptr++) { | |
42584c81 YY |
5380 | if (*ptr == -1 || *ptr == NO_CMDLINE_MAP) |
5381 | continue; | |
69abe6a5 | 5382 | |
42584c81 YY |
5383 | return ptr; |
5384 | } | |
69abe6a5 | 5385 | |
42584c81 YY |
5386 | return NULL; |
5387 | } | |
5388 | ||
5389 | static void *saved_cmdlines_start(struct seq_file *m, loff_t *pos) | |
5390 | { | |
5391 | void *v; | |
5392 | loff_t l = 0; | |
69abe6a5 | 5393 | |
4c27e756 SRRH |
5394 | preempt_disable(); |
5395 | arch_spin_lock(&trace_cmdline_lock); | |
5396 | ||
939c7a4f | 5397 | v = &savedcmd->map_cmdline_to_pid[0]; |
42584c81 YY |
5398 | while (l <= *pos) { |
5399 | v = saved_cmdlines_next(m, v, &l); | |
5400 | if (!v) | |
5401 | return NULL; | |
69abe6a5 AP |
5402 | } |
5403 | ||
42584c81 YY |
5404 | return v; |
5405 | } | |
5406 | ||
5407 | static void saved_cmdlines_stop(struct seq_file *m, void *v) | |
5408 | { | |
4c27e756 SRRH |
5409 | arch_spin_unlock(&trace_cmdline_lock); |
5410 | preempt_enable(); | |
42584c81 | 5411 | } |
69abe6a5 | 5412 | |
42584c81 YY |
5413 | static int saved_cmdlines_show(struct seq_file *m, void *v) |
5414 | { | |
5415 | char buf[TASK_COMM_LEN]; | |
5416 | unsigned int *pid = v; | |
69abe6a5 | 5417 | |
4c27e756 | 5418 | __trace_find_cmdline(*pid, buf); |
42584c81 YY |
5419 | seq_printf(m, "%d %s\n", *pid, buf); |
5420 | return 0; | |
5421 | } | |
5422 | ||
5423 | static const struct seq_operations tracing_saved_cmdlines_seq_ops = { | |
5424 | .start = saved_cmdlines_start, | |
5425 | .next = saved_cmdlines_next, | |
5426 | .stop = saved_cmdlines_stop, | |
5427 | .show = saved_cmdlines_show, | |
5428 | }; | |
5429 | ||
5430 | static int tracing_saved_cmdlines_open(struct inode *inode, struct file *filp) | |
5431 | { | |
8530dec6 SRV |
5432 | int ret; |
5433 | ||
5434 | ret = tracing_check_open_get_tr(NULL); | |
5435 | if (ret) | |
5436 | return ret; | |
42584c81 YY |
5437 | |
5438 | return seq_open(filp, &tracing_saved_cmdlines_seq_ops); | |
69abe6a5 AP |
5439 | } |
5440 | ||
5441 | static const struct file_operations tracing_saved_cmdlines_fops = { | |
42584c81 YY |
5442 | .open = tracing_saved_cmdlines_open, |
5443 | .read = seq_read, | |
5444 | .llseek = seq_lseek, | |
5445 | .release = seq_release, | |
69abe6a5 AP |
5446 | }; |
5447 | ||
939c7a4f YY |
5448 | static ssize_t |
5449 | tracing_saved_cmdlines_size_read(struct file *filp, char __user *ubuf, | |
5450 | size_t cnt, loff_t *ppos) | |
5451 | { | |
5452 | char buf[64]; | |
5453 | int r; | |
5454 | ||
5455 | arch_spin_lock(&trace_cmdline_lock); | |
a6af8fbf | 5456 | r = scnprintf(buf, sizeof(buf), "%u\n", savedcmd->cmdline_num); |
939c7a4f YY |
5457 | arch_spin_unlock(&trace_cmdline_lock); |
5458 | ||
5459 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
5460 | } | |
5461 | ||
5462 | static void free_saved_cmdlines_buffer(struct saved_cmdlines_buffer *s) | |
5463 | { | |
5464 | kfree(s->saved_cmdlines); | |
5465 | kfree(s->map_cmdline_to_pid); | |
5466 | kfree(s); | |
5467 | } | |
5468 | ||
5469 | static int tracing_resize_saved_cmdlines(unsigned int val) | |
5470 | { | |
5471 | struct saved_cmdlines_buffer *s, *savedcmd_temp; | |
5472 | ||
a6af8fbf | 5473 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
939c7a4f YY |
5474 | if (!s) |
5475 | return -ENOMEM; | |
5476 | ||
5477 | if (allocate_cmdlines_buffer(val, s) < 0) { | |
5478 | kfree(s); | |
5479 | return -ENOMEM; | |
5480 | } | |
5481 | ||
5482 | arch_spin_lock(&trace_cmdline_lock); | |
5483 | savedcmd_temp = savedcmd; | |
5484 | savedcmd = s; | |
5485 | arch_spin_unlock(&trace_cmdline_lock); | |
5486 | free_saved_cmdlines_buffer(savedcmd_temp); | |
5487 | ||
5488 | return 0; | |
5489 | } | |
5490 | ||
5491 | static ssize_t | |
5492 | tracing_saved_cmdlines_size_write(struct file *filp, const char __user *ubuf, | |
5493 | size_t cnt, loff_t *ppos) | |
5494 | { | |
5495 | unsigned long val; | |
5496 | int ret; | |
5497 | ||
5498 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); | |
5499 | if (ret) | |
5500 | return ret; | |
5501 | ||
5502 | /* must have at least 1 entry or less than PID_MAX_DEFAULT */ | |
5503 | if (!val || val > PID_MAX_DEFAULT) | |
5504 | return -EINVAL; | |
5505 | ||
5506 | ret = tracing_resize_saved_cmdlines((unsigned int)val); | |
5507 | if (ret < 0) | |
5508 | return ret; | |
5509 | ||
5510 | *ppos += cnt; | |
5511 | ||
5512 | return cnt; | |
5513 | } | |
5514 | ||
5515 | static const struct file_operations tracing_saved_cmdlines_size_fops = { | |
5516 | .open = tracing_open_generic, | |
5517 | .read = tracing_saved_cmdlines_size_read, | |
5518 | .write = tracing_saved_cmdlines_size_write, | |
5519 | }; | |
5520 | ||
681bec03 | 5521 | #ifdef CONFIG_TRACE_EVAL_MAP_FILE |
23bf8cb8 | 5522 | static union trace_eval_map_item * |
f57a4143 | 5523 | update_eval_map(union trace_eval_map_item *ptr) |
9828413d | 5524 | { |
00f4b652 | 5525 | if (!ptr->map.eval_string) { |
9828413d SRRH |
5526 | if (ptr->tail.next) { |
5527 | ptr = ptr->tail.next; | |
5528 | /* Set ptr to the next real item (skip head) */ | |
5529 | ptr++; | |
5530 | } else | |
5531 | return NULL; | |
5532 | } | |
5533 | return ptr; | |
5534 | } | |
5535 | ||
f57a4143 | 5536 | static void *eval_map_next(struct seq_file *m, void *v, loff_t *pos) |
9828413d | 5537 | { |
23bf8cb8 | 5538 | union trace_eval_map_item *ptr = v; |
9828413d SRRH |
5539 | |
5540 | /* | |
5541 | * Paranoid! If ptr points to end, we don't want to increment past it. | |
5542 | * This really should never happen. | |
5543 | */ | |
039958a5 | 5544 | (*pos)++; |
f57a4143 | 5545 | ptr = update_eval_map(ptr); |
9828413d SRRH |
5546 | if (WARN_ON_ONCE(!ptr)) |
5547 | return NULL; | |
5548 | ||
5549 | ptr++; | |
f57a4143 | 5550 | ptr = update_eval_map(ptr); |
9828413d SRRH |
5551 | |
5552 | return ptr; | |
5553 | } | |
5554 | ||
f57a4143 | 5555 | static void *eval_map_start(struct seq_file *m, loff_t *pos) |
9828413d | 5556 | { |
23bf8cb8 | 5557 | union trace_eval_map_item *v; |
9828413d SRRH |
5558 | loff_t l = 0; |
5559 | ||
1793ed93 | 5560 | mutex_lock(&trace_eval_mutex); |
9828413d | 5561 | |
23bf8cb8 | 5562 | v = trace_eval_maps; |
9828413d SRRH |
5563 | if (v) |
5564 | v++; | |
5565 | ||
5566 | while (v && l < *pos) { | |
f57a4143 | 5567 | v = eval_map_next(m, v, &l); |
9828413d SRRH |
5568 | } |
5569 | ||
5570 | return v; | |
5571 | } | |
5572 | ||
f57a4143 | 5573 | static void eval_map_stop(struct seq_file *m, void *v) |
9828413d | 5574 | { |
1793ed93 | 5575 | mutex_unlock(&trace_eval_mutex); |
9828413d SRRH |
5576 | } |
5577 | ||
f57a4143 | 5578 | static int eval_map_show(struct seq_file *m, void *v) |
9828413d | 5579 | { |
23bf8cb8 | 5580 | union trace_eval_map_item *ptr = v; |
9828413d SRRH |
5581 | |
5582 | seq_printf(m, "%s %ld (%s)\n", | |
00f4b652 | 5583 | ptr->map.eval_string, ptr->map.eval_value, |
9828413d SRRH |
5584 | ptr->map.system); |
5585 | ||
5586 | return 0; | |
5587 | } | |
5588 | ||
f57a4143 JL |
5589 | static const struct seq_operations tracing_eval_map_seq_ops = { |
5590 | .start = eval_map_start, | |
5591 | .next = eval_map_next, | |
5592 | .stop = eval_map_stop, | |
5593 | .show = eval_map_show, | |
9828413d SRRH |
5594 | }; |
5595 | ||
f57a4143 | 5596 | static int tracing_eval_map_open(struct inode *inode, struct file *filp) |
9828413d | 5597 | { |
8530dec6 SRV |
5598 | int ret; |
5599 | ||
5600 | ret = tracing_check_open_get_tr(NULL); | |
5601 | if (ret) | |
5602 | return ret; | |
9828413d | 5603 | |
f57a4143 | 5604 | return seq_open(filp, &tracing_eval_map_seq_ops); |
9828413d SRRH |
5605 | } |
5606 | ||
f57a4143 JL |
5607 | static const struct file_operations tracing_eval_map_fops = { |
5608 | .open = tracing_eval_map_open, | |
9828413d SRRH |
5609 | .read = seq_read, |
5610 | .llseek = seq_lseek, | |
5611 | .release = seq_release, | |
5612 | }; | |
5613 | ||
23bf8cb8 | 5614 | static inline union trace_eval_map_item * |
5f60b351 | 5615 | trace_eval_jmp_to_tail(union trace_eval_map_item *ptr) |
9828413d SRRH |
5616 | { |
5617 | /* Return tail of array given the head */ | |
5618 | return ptr + ptr->head.length + 1; | |
5619 | } | |
5620 | ||
5621 | static void | |
f57a4143 | 5622 | trace_insert_eval_map_file(struct module *mod, struct trace_eval_map **start, |
9828413d SRRH |
5623 | int len) |
5624 | { | |
00f4b652 JL |
5625 | struct trace_eval_map **stop; |
5626 | struct trace_eval_map **map; | |
23bf8cb8 JL |
5627 | union trace_eval_map_item *map_array; |
5628 | union trace_eval_map_item *ptr; | |
9828413d SRRH |
5629 | |
5630 | stop = start + len; | |
5631 | ||
5632 | /* | |
23bf8cb8 | 5633 | * The trace_eval_maps contains the map plus a head and tail item, |
9828413d SRRH |
5634 | * where the head holds the module and length of array, and the |
5635 | * tail holds a pointer to the next list. | |
5636 | */ | |
6da2ec56 | 5637 | map_array = kmalloc_array(len + 2, sizeof(*map_array), GFP_KERNEL); |
9828413d | 5638 | if (!map_array) { |
f57a4143 | 5639 | pr_warn("Unable to allocate trace eval mapping\n"); |
9828413d SRRH |
5640 | return; |
5641 | } | |
5642 | ||
1793ed93 | 5643 | mutex_lock(&trace_eval_mutex); |
9828413d | 5644 | |
23bf8cb8 JL |
5645 | if (!trace_eval_maps) |
5646 | trace_eval_maps = map_array; | |
9828413d | 5647 | else { |
23bf8cb8 | 5648 | ptr = trace_eval_maps; |
9828413d | 5649 | for (;;) { |
5f60b351 | 5650 | ptr = trace_eval_jmp_to_tail(ptr); |
9828413d SRRH |
5651 | if (!ptr->tail.next) |
5652 | break; | |
5653 | ptr = ptr->tail.next; | |
5654 | ||
5655 | } | |
5656 | ptr->tail.next = map_array; | |
5657 | } | |
5658 | map_array->head.mod = mod; | |
5659 | map_array->head.length = len; | |
5660 | map_array++; | |
5661 | ||
5662 | for (map = start; (unsigned long)map < (unsigned long)stop; map++) { | |
5663 | map_array->map = **map; | |
5664 | map_array++; | |
5665 | } | |
5666 | memset(map_array, 0, sizeof(*map_array)); | |
5667 | ||
1793ed93 | 5668 | mutex_unlock(&trace_eval_mutex); |
9828413d SRRH |
5669 | } |
5670 | ||
f57a4143 | 5671 | static void trace_create_eval_file(struct dentry *d_tracer) |
9828413d | 5672 | { |
681bec03 | 5673 | trace_create_file("eval_map", 0444, d_tracer, |
f57a4143 | 5674 | NULL, &tracing_eval_map_fops); |
9828413d SRRH |
5675 | } |
5676 | ||
681bec03 | 5677 | #else /* CONFIG_TRACE_EVAL_MAP_FILE */ |
f57a4143 JL |
5678 | static inline void trace_create_eval_file(struct dentry *d_tracer) { } |
5679 | static inline void trace_insert_eval_map_file(struct module *mod, | |
00f4b652 | 5680 | struct trace_eval_map **start, int len) { } |
681bec03 | 5681 | #endif /* !CONFIG_TRACE_EVAL_MAP_FILE */ |
9828413d | 5682 | |
f57a4143 | 5683 | static void trace_insert_eval_map(struct module *mod, |
00f4b652 | 5684 | struct trace_eval_map **start, int len) |
0c564a53 | 5685 | { |
00f4b652 | 5686 | struct trace_eval_map **map; |
0c564a53 SRRH |
5687 | |
5688 | if (len <= 0) | |
5689 | return; | |
5690 | ||
5691 | map = start; | |
5692 | ||
f57a4143 | 5693 | trace_event_eval_update(map, len); |
9828413d | 5694 | |
f57a4143 | 5695 | trace_insert_eval_map_file(mod, start, len); |
0c564a53 SRRH |
5696 | } |
5697 | ||
bc0c38d1 SR |
5698 | static ssize_t |
5699 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
5700 | size_t cnt, loff_t *ppos) | |
5701 | { | |
2b6080f2 | 5702 | struct trace_array *tr = filp->private_data; |
ee6c2c1b | 5703 | char buf[MAX_TRACER_SIZE+2]; |
bc0c38d1 SR |
5704 | int r; |
5705 | ||
5706 | mutex_lock(&trace_types_lock); | |
2b6080f2 | 5707 | r = sprintf(buf, "%s\n", tr->current_trace->name); |
bc0c38d1 SR |
5708 | mutex_unlock(&trace_types_lock); |
5709 | ||
4bf39a94 | 5710 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
5711 | } |
5712 | ||
b6f11df2 ACM |
5713 | int tracer_init(struct tracer *t, struct trace_array *tr) |
5714 | { | |
1c5eb448 | 5715 | tracing_reset_online_cpus(&tr->array_buffer); |
b6f11df2 ACM |
5716 | return t->init(tr); |
5717 | } | |
5718 | ||
1c5eb448 | 5719 | static void set_buffer_entries(struct array_buffer *buf, unsigned long val) |
438ced17 VN |
5720 | { |
5721 | int cpu; | |
737223fb | 5722 | |
438ced17 | 5723 | for_each_tracing_cpu(cpu) |
12883efb | 5724 | per_cpu_ptr(buf->data, cpu)->entries = val; |
438ced17 VN |
5725 | } |
5726 | ||
12883efb | 5727 | #ifdef CONFIG_TRACER_MAX_TRACE |
d60da506 | 5728 | /* resize @tr's buffer to the size of @size_tr's entries */ |
1c5eb448 SRV |
5729 | static int resize_buffer_duplicate_size(struct array_buffer *trace_buf, |
5730 | struct array_buffer *size_buf, int cpu_id) | |
d60da506 HT |
5731 | { |
5732 | int cpu, ret = 0; | |
5733 | ||
5734 | if (cpu_id == RING_BUFFER_ALL_CPUS) { | |
5735 | for_each_tracing_cpu(cpu) { | |
12883efb SRRH |
5736 | ret = ring_buffer_resize(trace_buf->buffer, |
5737 | per_cpu_ptr(size_buf->data, cpu)->entries, cpu); | |
d60da506 HT |
5738 | if (ret < 0) |
5739 | break; | |
12883efb SRRH |
5740 | per_cpu_ptr(trace_buf->data, cpu)->entries = |
5741 | per_cpu_ptr(size_buf->data, cpu)->entries; | |
d60da506 HT |
5742 | } |
5743 | } else { | |
12883efb SRRH |
5744 | ret = ring_buffer_resize(trace_buf->buffer, |
5745 | per_cpu_ptr(size_buf->data, cpu_id)->entries, cpu_id); | |
d60da506 | 5746 | if (ret == 0) |
12883efb SRRH |
5747 | per_cpu_ptr(trace_buf->data, cpu_id)->entries = |
5748 | per_cpu_ptr(size_buf->data, cpu_id)->entries; | |
d60da506 HT |
5749 | } |
5750 | ||
5751 | return ret; | |
5752 | } | |
12883efb | 5753 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
d60da506 | 5754 | |
2b6080f2 SR |
5755 | static int __tracing_resize_ring_buffer(struct trace_array *tr, |
5756 | unsigned long size, int cpu) | |
73c5162a SR |
5757 | { |
5758 | int ret; | |
5759 | ||
5760 | /* | |
5761 | * If kernel or user changes the size of the ring buffer | |
a123c52b SR |
5762 | * we use the size that was given, and we can forget about |
5763 | * expanding it later. | |
73c5162a | 5764 | */ |
55034cd6 | 5765 | ring_buffer_expanded = true; |
73c5162a | 5766 | |
b382ede6 | 5767 | /* May be called before buffers are initialized */ |
1c5eb448 | 5768 | if (!tr->array_buffer.buffer) |
b382ede6 SR |
5769 | return 0; |
5770 | ||
1c5eb448 | 5771 | ret = ring_buffer_resize(tr->array_buffer.buffer, size, cpu); |
73c5162a SR |
5772 | if (ret < 0) |
5773 | return ret; | |
5774 | ||
12883efb | 5775 | #ifdef CONFIG_TRACER_MAX_TRACE |
2b6080f2 SR |
5776 | if (!(tr->flags & TRACE_ARRAY_FL_GLOBAL) || |
5777 | !tr->current_trace->use_max_tr) | |
ef710e10 KM |
5778 | goto out; |
5779 | ||
12883efb | 5780 | ret = ring_buffer_resize(tr->max_buffer.buffer, size, cpu); |
73c5162a | 5781 | if (ret < 0) { |
1c5eb448 SRV |
5782 | int r = resize_buffer_duplicate_size(&tr->array_buffer, |
5783 | &tr->array_buffer, cpu); | |
73c5162a | 5784 | if (r < 0) { |
a123c52b SR |
5785 | /* |
5786 | * AARGH! We are left with different | |
5787 | * size max buffer!!!! | |
5788 | * The max buffer is our "snapshot" buffer. | |
5789 | * When a tracer needs a snapshot (one of the | |
5790 | * latency tracers), it swaps the max buffer | |
5791 | * with the saved snap shot. We succeeded to | |
5792 | * update the size of the main buffer, but failed to | |
5793 | * update the size of the max buffer. But when we tried | |
5794 | * to reset the main buffer to the original size, we | |
5795 | * failed there too. This is very unlikely to | |
5796 | * happen, but if it does, warn and kill all | |
5797 | * tracing. | |
5798 | */ | |
73c5162a SR |
5799 | WARN_ON(1); |
5800 | tracing_disabled = 1; | |
5801 | } | |
5802 | return ret; | |
5803 | } | |
5804 | ||
438ced17 | 5805 | if (cpu == RING_BUFFER_ALL_CPUS) |
12883efb | 5806 | set_buffer_entries(&tr->max_buffer, size); |
438ced17 | 5807 | else |
12883efb | 5808 | per_cpu_ptr(tr->max_buffer.data, cpu)->entries = size; |
438ced17 | 5809 | |
ef710e10 | 5810 | out: |
12883efb SRRH |
5811 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
5812 | ||
438ced17 | 5813 | if (cpu == RING_BUFFER_ALL_CPUS) |
1c5eb448 | 5814 | set_buffer_entries(&tr->array_buffer, size); |
438ced17 | 5815 | else |
1c5eb448 | 5816 | per_cpu_ptr(tr->array_buffer.data, cpu)->entries = size; |
73c5162a SR |
5817 | |
5818 | return ret; | |
5819 | } | |
5820 | ||
9c5b9d3d MH |
5821 | ssize_t tracing_resize_ring_buffer(struct trace_array *tr, |
5822 | unsigned long size, int cpu_id) | |
4f271a2a | 5823 | { |
83f40318 | 5824 | int ret = size; |
4f271a2a VN |
5825 | |
5826 | mutex_lock(&trace_types_lock); | |
5827 | ||
438ced17 VN |
5828 | if (cpu_id != RING_BUFFER_ALL_CPUS) { |
5829 | /* make sure, this cpu is enabled in the mask */ | |
5830 | if (!cpumask_test_cpu(cpu_id, tracing_buffer_mask)) { | |
5831 | ret = -EINVAL; | |
5832 | goto out; | |
5833 | } | |
5834 | } | |
4f271a2a | 5835 | |
2b6080f2 | 5836 | ret = __tracing_resize_ring_buffer(tr, size, cpu_id); |
4f271a2a VN |
5837 | if (ret < 0) |
5838 | ret = -ENOMEM; | |
5839 | ||
438ced17 | 5840 | out: |
4f271a2a VN |
5841 | mutex_unlock(&trace_types_lock); |
5842 | ||
5843 | return ret; | |
5844 | } | |
5845 | ||
ef710e10 | 5846 | |
1852fcce SR |
5847 | /** |
5848 | * tracing_update_buffers - used by tracing facility to expand ring buffers | |
5849 | * | |
5850 | * To save on memory when the tracing is never used on a system with it | |
5851 | * configured in. The ring buffers are set to a minimum size. But once | |
5852 | * a user starts to use the tracing facility, then they need to grow | |
5853 | * to their default size. | |
5854 | * | |
5855 | * This function is to be called when a tracer is about to be used. | |
5856 | */ | |
5857 | int tracing_update_buffers(void) | |
5858 | { | |
5859 | int ret = 0; | |
5860 | ||
1027fcb2 | 5861 | mutex_lock(&trace_types_lock); |
1852fcce | 5862 | if (!ring_buffer_expanded) |
2b6080f2 | 5863 | ret = __tracing_resize_ring_buffer(&global_trace, trace_buf_size, |
438ced17 | 5864 | RING_BUFFER_ALL_CPUS); |
1027fcb2 | 5865 | mutex_unlock(&trace_types_lock); |
1852fcce SR |
5866 | |
5867 | return ret; | |
5868 | } | |
5869 | ||
577b785f SR |
5870 | struct trace_option_dentry; |
5871 | ||
37aea98b | 5872 | static void |
2b6080f2 | 5873 | create_trace_option_files(struct trace_array *tr, struct tracer *tracer); |
577b785f | 5874 | |
6b450d25 SRRH |
5875 | /* |
5876 | * Used to clear out the tracer before deletion of an instance. | |
5877 | * Must have trace_types_lock held. | |
5878 | */ | |
5879 | static void tracing_set_nop(struct trace_array *tr) | |
5880 | { | |
5881 | if (tr->current_trace == &nop_trace) | |
5882 | return; | |
5883 | ||
50512ab5 | 5884 | tr->current_trace->enabled--; |
6b450d25 SRRH |
5885 | |
5886 | if (tr->current_trace->reset) | |
5887 | tr->current_trace->reset(tr); | |
5888 | ||
5889 | tr->current_trace = &nop_trace; | |
5890 | } | |
5891 | ||
41d9c0be | 5892 | static void add_tracer_options(struct trace_array *tr, struct tracer *t) |
bc0c38d1 | 5893 | { |
09d23a1d SRRH |
5894 | /* Only enable if the directory has been created already. */ |
5895 | if (!tr->dir) | |
5896 | return; | |
5897 | ||
37aea98b | 5898 | create_trace_option_files(tr, t); |
09d23a1d SRRH |
5899 | } |
5900 | ||
9c5b9d3d | 5901 | int tracing_set_tracer(struct trace_array *tr, const char *buf) |
09d23a1d | 5902 | { |
bc0c38d1 | 5903 | struct tracer *t; |
12883efb | 5904 | #ifdef CONFIG_TRACER_MAX_TRACE |
34600f0e | 5905 | bool had_max_tr; |
12883efb | 5906 | #endif |
d9e54076 | 5907 | int ret = 0; |
bc0c38d1 | 5908 | |
1027fcb2 SR |
5909 | mutex_lock(&trace_types_lock); |
5910 | ||
73c5162a | 5911 | if (!ring_buffer_expanded) { |
2b6080f2 | 5912 | ret = __tracing_resize_ring_buffer(tr, trace_buf_size, |
438ced17 | 5913 | RING_BUFFER_ALL_CPUS); |
73c5162a | 5914 | if (ret < 0) |
59f586db | 5915 | goto out; |
73c5162a SR |
5916 | ret = 0; |
5917 | } | |
5918 | ||
bc0c38d1 SR |
5919 | for (t = trace_types; t; t = t->next) { |
5920 | if (strcmp(t->name, buf) == 0) | |
5921 | break; | |
5922 | } | |
c2931e05 FW |
5923 | if (!t) { |
5924 | ret = -EINVAL; | |
5925 | goto out; | |
5926 | } | |
2b6080f2 | 5927 | if (t == tr->current_trace) |
bc0c38d1 SR |
5928 | goto out; |
5929 | ||
a35873a0 TZ |
5930 | #ifdef CONFIG_TRACER_SNAPSHOT |
5931 | if (t->use_max_tr) { | |
5932 | arch_spin_lock(&tr->max_lock); | |
5933 | if (tr->cond_snapshot) | |
5934 | ret = -EBUSY; | |
5935 | arch_spin_unlock(&tr->max_lock); | |
5936 | if (ret) | |
5937 | goto out; | |
5938 | } | |
5939 | #endif | |
c7b3ae0b ZSZ |
5940 | /* Some tracers won't work on kernel command line */ |
5941 | if (system_state < SYSTEM_RUNNING && t->noboot) { | |
5942 | pr_warn("Tracer '%s' is not allowed on command line, ignored\n", | |
5943 | t->name); | |
5944 | goto out; | |
5945 | } | |
5946 | ||
607e2ea1 SRRH |
5947 | /* Some tracers are only allowed for the top level buffer */ |
5948 | if (!trace_ok_for_array(t, tr)) { | |
5949 | ret = -EINVAL; | |
5950 | goto out; | |
5951 | } | |
5952 | ||
cf6ab6d9 | 5953 | /* If trace pipe files are being read, we can't change the tracer */ |
7ef282e0 | 5954 | if (tr->trace_ref) { |
cf6ab6d9 SRRH |
5955 | ret = -EBUSY; |
5956 | goto out; | |
5957 | } | |
5958 | ||
9f029e83 | 5959 | trace_branch_disable(); |
613f04a0 | 5960 | |
50512ab5 | 5961 | tr->current_trace->enabled--; |
613f04a0 | 5962 | |
2b6080f2 SR |
5963 | if (tr->current_trace->reset) |
5964 | tr->current_trace->reset(tr); | |
34600f0e | 5965 | |
74401729 | 5966 | /* Current trace needs to be nop_trace before synchronize_rcu */ |
2b6080f2 | 5967 | tr->current_trace = &nop_trace; |
34600f0e | 5968 | |
45ad21ca SRRH |
5969 | #ifdef CONFIG_TRACER_MAX_TRACE |
5970 | had_max_tr = tr->allocated_snapshot; | |
34600f0e SR |
5971 | |
5972 | if (had_max_tr && !t->use_max_tr) { | |
5973 | /* | |
5974 | * We need to make sure that the update_max_tr sees that | |
5975 | * current_trace changed to nop_trace to keep it from | |
5976 | * swapping the buffers after we resize it. | |
5977 | * The update_max_tr is called from interrupts disabled | |
5978 | * so a synchronized_sched() is sufficient. | |
5979 | */ | |
74401729 | 5980 | synchronize_rcu(); |
3209cff4 | 5981 | free_snapshot(tr); |
ef710e10 | 5982 | } |
12883efb | 5983 | #endif |
12883efb SRRH |
5984 | |
5985 | #ifdef CONFIG_TRACER_MAX_TRACE | |
34600f0e | 5986 | if (t->use_max_tr && !had_max_tr) { |
2824f503 | 5987 | ret = tracing_alloc_snapshot_instance(tr); |
d60da506 HT |
5988 | if (ret < 0) |
5989 | goto out; | |
ef710e10 | 5990 | } |
12883efb | 5991 | #endif |
577b785f | 5992 | |
1c80025a | 5993 | if (t->init) { |
b6f11df2 | 5994 | ret = tracer_init(t, tr); |
1c80025a FW |
5995 | if (ret) |
5996 | goto out; | |
5997 | } | |
bc0c38d1 | 5998 | |
2b6080f2 | 5999 | tr->current_trace = t; |
50512ab5 | 6000 | tr->current_trace->enabled++; |
9f029e83 | 6001 | trace_branch_enable(tr); |
bc0c38d1 SR |
6002 | out: |
6003 | mutex_unlock(&trace_types_lock); | |
6004 | ||
d9e54076 PZ |
6005 | return ret; |
6006 | } | |
6007 | ||
6008 | static ssize_t | |
6009 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
6010 | size_t cnt, loff_t *ppos) | |
6011 | { | |
607e2ea1 | 6012 | struct trace_array *tr = filp->private_data; |
ee6c2c1b | 6013 | char buf[MAX_TRACER_SIZE+1]; |
d9e54076 PZ |
6014 | int i; |
6015 | size_t ret; | |
e6e7a65a FW |
6016 | int err; |
6017 | ||
6018 | ret = cnt; | |
d9e54076 | 6019 | |
ee6c2c1b LZ |
6020 | if (cnt > MAX_TRACER_SIZE) |
6021 | cnt = MAX_TRACER_SIZE; | |
d9e54076 | 6022 | |
4afe6495 | 6023 | if (copy_from_user(buf, ubuf, cnt)) |
d9e54076 PZ |
6024 | return -EFAULT; |
6025 | ||
6026 | buf[cnt] = 0; | |
6027 | ||
6028 | /* strip ending whitespace. */ | |
6029 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
6030 | buf[i] = 0; | |
6031 | ||
607e2ea1 | 6032 | err = tracing_set_tracer(tr, buf); |
e6e7a65a FW |
6033 | if (err) |
6034 | return err; | |
d9e54076 | 6035 | |
cf8517cf | 6036 | *ppos += ret; |
bc0c38d1 | 6037 | |
c2931e05 | 6038 | return ret; |
bc0c38d1 SR |
6039 | } |
6040 | ||
6041 | static ssize_t | |
6508fa76 SF |
6042 | tracing_nsecs_read(unsigned long *ptr, char __user *ubuf, |
6043 | size_t cnt, loff_t *ppos) | |
bc0c38d1 | 6044 | { |
bc0c38d1 SR |
6045 | char buf[64]; |
6046 | int r; | |
6047 | ||
cffae437 | 6048 | r = snprintf(buf, sizeof(buf), "%ld\n", |
bc0c38d1 | 6049 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
cffae437 SR |
6050 | if (r > sizeof(buf)) |
6051 | r = sizeof(buf); | |
4bf39a94 | 6052 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
6053 | } |
6054 | ||
6055 | static ssize_t | |
6508fa76 SF |
6056 | tracing_nsecs_write(unsigned long *ptr, const char __user *ubuf, |
6057 | size_t cnt, loff_t *ppos) | |
bc0c38d1 | 6058 | { |
5e39841c | 6059 | unsigned long val; |
c6caeeb1 | 6060 | int ret; |
bc0c38d1 | 6061 | |
22fe9b54 PH |
6062 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
6063 | if (ret) | |
c6caeeb1 | 6064 | return ret; |
bc0c38d1 SR |
6065 | |
6066 | *ptr = val * 1000; | |
6067 | ||
6068 | return cnt; | |
6069 | } | |
6070 | ||
6508fa76 SF |
6071 | static ssize_t |
6072 | tracing_thresh_read(struct file *filp, char __user *ubuf, | |
6073 | size_t cnt, loff_t *ppos) | |
6074 | { | |
6075 | return tracing_nsecs_read(&tracing_thresh, ubuf, cnt, ppos); | |
6076 | } | |
6077 | ||
6078 | static ssize_t | |
6079 | tracing_thresh_write(struct file *filp, const char __user *ubuf, | |
6080 | size_t cnt, loff_t *ppos) | |
6081 | { | |
6082 | struct trace_array *tr = filp->private_data; | |
6083 | int ret; | |
6084 | ||
6085 | mutex_lock(&trace_types_lock); | |
6086 | ret = tracing_nsecs_write(&tracing_thresh, ubuf, cnt, ppos); | |
6087 | if (ret < 0) | |
6088 | goto out; | |
6089 | ||
6090 | if (tr->current_trace->update_thresh) { | |
6091 | ret = tr->current_trace->update_thresh(tr); | |
6092 | if (ret < 0) | |
6093 | goto out; | |
6094 | } | |
6095 | ||
6096 | ret = cnt; | |
6097 | out: | |
6098 | mutex_unlock(&trace_types_lock); | |
6099 | ||
6100 | return ret; | |
6101 | } | |
6102 | ||
f971cc9a | 6103 | #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) |
e428abbb | 6104 | |
6508fa76 SF |
6105 | static ssize_t |
6106 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
6107 | size_t cnt, loff_t *ppos) | |
6108 | { | |
6109 | return tracing_nsecs_read(filp->private_data, ubuf, cnt, ppos); | |
6110 | } | |
6111 | ||
6112 | static ssize_t | |
6113 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
6114 | size_t cnt, loff_t *ppos) | |
6115 | { | |
6116 | return tracing_nsecs_write(filp->private_data, ubuf, cnt, ppos); | |
6117 | } | |
6118 | ||
e428abbb CG |
6119 | #endif |
6120 | ||
b3806b43 SR |
6121 | static int tracing_open_pipe(struct inode *inode, struct file *filp) |
6122 | { | |
15544209 | 6123 | struct trace_array *tr = inode->i_private; |
b3806b43 | 6124 | struct trace_iterator *iter; |
8530dec6 | 6125 | int ret; |
b3806b43 | 6126 | |
8530dec6 SRV |
6127 | ret = tracing_check_open_get_tr(tr); |
6128 | if (ret) | |
6129 | return ret; | |
7b85af63 | 6130 | |
b04cc6b1 FW |
6131 | mutex_lock(&trace_types_lock); |
6132 | ||
b3806b43 SR |
6133 | /* create a buffer to store the information to pass to userspace */ |
6134 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
b04cc6b1 FW |
6135 | if (!iter) { |
6136 | ret = -ENOMEM; | |
f77d09a3 | 6137 | __trace_array_put(tr); |
b04cc6b1 FW |
6138 | goto out; |
6139 | } | |
b3806b43 | 6140 | |
3a161d99 | 6141 | trace_seq_init(&iter->seq); |
d716ff71 | 6142 | iter->trace = tr->current_trace; |
d7350c3f | 6143 | |
4462344e | 6144 | if (!alloc_cpumask_var(&iter->started, GFP_KERNEL)) { |
b04cc6b1 | 6145 | ret = -ENOMEM; |
d7350c3f | 6146 | goto fail; |
4462344e RR |
6147 | } |
6148 | ||
a309720c | 6149 | /* trace pipe does not show start of buffer */ |
4462344e | 6150 | cpumask_setall(iter->started); |
a309720c | 6151 | |
983f938a | 6152 | if (tr->trace_flags & TRACE_ITER_LATENCY_FMT) |
112f38a7 SR |
6153 | iter->iter_flags |= TRACE_FILE_LAT_FMT; |
6154 | ||
8be0709f | 6155 | /* Output in nanoseconds only if we are using a clock in nanoseconds. */ |
58e8eedf | 6156 | if (trace_clocks[tr->clock_id].in_ns) |
8be0709f DS |
6157 | iter->iter_flags |= TRACE_FILE_TIME_IN_NS; |
6158 | ||
15544209 | 6159 | iter->tr = tr; |
1c5eb448 | 6160 | iter->array_buffer = &tr->array_buffer; |
15544209 | 6161 | iter->cpu_file = tracing_get_cpu(inode); |
d7350c3f | 6162 | mutex_init(&iter->mutex); |
b3806b43 SR |
6163 | filp->private_data = iter; |
6164 | ||
107bad8b SR |
6165 | if (iter->trace->pipe_open) |
6166 | iter->trace->pipe_open(iter); | |
107bad8b | 6167 | |
b444786f | 6168 | nonseekable_open(inode, filp); |
cf6ab6d9 | 6169 | |
7ef282e0 | 6170 | tr->trace_ref++; |
b04cc6b1 FW |
6171 | out: |
6172 | mutex_unlock(&trace_types_lock); | |
6173 | return ret; | |
d7350c3f FW |
6174 | |
6175 | fail: | |
d7350c3f | 6176 | kfree(iter); |
7b85af63 | 6177 | __trace_array_put(tr); |
d7350c3f FW |
6178 | mutex_unlock(&trace_types_lock); |
6179 | return ret; | |
b3806b43 SR |
6180 | } |
6181 | ||
6182 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
6183 | { | |
6184 | struct trace_iterator *iter = file->private_data; | |
15544209 | 6185 | struct trace_array *tr = inode->i_private; |
b3806b43 | 6186 | |
b04cc6b1 FW |
6187 | mutex_lock(&trace_types_lock); |
6188 | ||
7ef282e0 | 6189 | tr->trace_ref--; |
cf6ab6d9 | 6190 | |
29bf4a5e | 6191 | if (iter->trace->pipe_close) |
c521efd1 SR |
6192 | iter->trace->pipe_close(iter); |
6193 | ||
b04cc6b1 FW |
6194 | mutex_unlock(&trace_types_lock); |
6195 | ||
4462344e | 6196 | free_cpumask_var(iter->started); |
d7350c3f | 6197 | mutex_destroy(&iter->mutex); |
b3806b43 | 6198 | kfree(iter); |
b3806b43 | 6199 | |
7b85af63 SRRH |
6200 | trace_array_put(tr); |
6201 | ||
b3806b43 SR |
6202 | return 0; |
6203 | } | |
6204 | ||
9dd95748 | 6205 | static __poll_t |
cc60cdc9 | 6206 | trace_poll(struct trace_iterator *iter, struct file *filp, poll_table *poll_table) |
2a2cc8f7 | 6207 | { |
983f938a SRRH |
6208 | struct trace_array *tr = iter->tr; |
6209 | ||
15693458 SRRH |
6210 | /* Iterators are static, they should be filled or empty */ |
6211 | if (trace_buffer_iter(iter, iter->cpu_file)) | |
a9a08845 | 6212 | return EPOLLIN | EPOLLRDNORM; |
2a2cc8f7 | 6213 | |
983f938a | 6214 | if (tr->trace_flags & TRACE_ITER_BLOCK) |
2a2cc8f7 SSP |
6215 | /* |
6216 | * Always select as readable when in blocking mode | |
6217 | */ | |
a9a08845 | 6218 | return EPOLLIN | EPOLLRDNORM; |
15693458 | 6219 | else |
1c5eb448 | 6220 | return ring_buffer_poll_wait(iter->array_buffer->buffer, iter->cpu_file, |
15693458 | 6221 | filp, poll_table); |
2a2cc8f7 | 6222 | } |
2a2cc8f7 | 6223 | |
9dd95748 | 6224 | static __poll_t |
cc60cdc9 SR |
6225 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) |
6226 | { | |
6227 | struct trace_iterator *iter = filp->private_data; | |
6228 | ||
6229 | return trace_poll(iter, filp, poll_table); | |
2a2cc8f7 SSP |
6230 | } |
6231 | ||
d716ff71 | 6232 | /* Must be called with iter->mutex held. */ |
ff98781b | 6233 | static int tracing_wait_pipe(struct file *filp) |
b3806b43 SR |
6234 | { |
6235 | struct trace_iterator *iter = filp->private_data; | |
8b8b3683 | 6236 | int ret; |
b3806b43 | 6237 | |
b3806b43 | 6238 | while (trace_empty(iter)) { |
2dc8f095 | 6239 | |
107bad8b | 6240 | if ((filp->f_flags & O_NONBLOCK)) { |
ff98781b | 6241 | return -EAGAIN; |
107bad8b | 6242 | } |
2dc8f095 | 6243 | |
b3806b43 | 6244 | /* |
250bfd3d | 6245 | * We block until we read something and tracing is disabled. |
b3806b43 SR |
6246 | * We still block if tracing is disabled, but we have never |
6247 | * read anything. This allows a user to cat this file, and | |
6248 | * then enable tracing. But after we have read something, | |
6249 | * we give an EOF when tracing is again disabled. | |
6250 | * | |
6251 | * iter->pos will be 0 if we haven't read anything. | |
6252 | */ | |
75df6e68 | 6253 | if (!tracer_tracing_is_on(iter->tr) && iter->pos) |
b3806b43 | 6254 | break; |
f4874261 SRRH |
6255 | |
6256 | mutex_unlock(&iter->mutex); | |
6257 | ||
2c2b0a78 | 6258 | ret = wait_on_pipe(iter, 0); |
f4874261 SRRH |
6259 | |
6260 | mutex_lock(&iter->mutex); | |
6261 | ||
8b8b3683 SRRH |
6262 | if (ret) |
6263 | return ret; | |
b3806b43 SR |
6264 | } |
6265 | ||
ff98781b EGM |
6266 | return 1; |
6267 | } | |
6268 | ||
6269 | /* | |
6270 | * Consumer reader. | |
6271 | */ | |
6272 | static ssize_t | |
6273 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
6274 | size_t cnt, loff_t *ppos) | |
6275 | { | |
6276 | struct trace_iterator *iter = filp->private_data; | |
6277 | ssize_t sret; | |
6278 | ||
d7350c3f FW |
6279 | /* |
6280 | * Avoid more than one consumer on a single file descriptor | |
6281 | * This is just a matter of traces coherency, the ring buffer itself | |
6282 | * is protected. | |
6283 | */ | |
6284 | mutex_lock(&iter->mutex); | |
1245800c SRRH |
6285 | |
6286 | /* return any leftover data */ | |
6287 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); | |
6288 | if (sret != -EBUSY) | |
6289 | goto out; | |
6290 | ||
6291 | trace_seq_init(&iter->seq); | |
6292 | ||
ff98781b EGM |
6293 | if (iter->trace->read) { |
6294 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); | |
6295 | if (sret) | |
6296 | goto out; | |
6297 | } | |
6298 | ||
6299 | waitagain: | |
6300 | sret = tracing_wait_pipe(filp); | |
6301 | if (sret <= 0) | |
6302 | goto out; | |
6303 | ||
b3806b43 | 6304 | /* stop when tracing is finished */ |
ff98781b EGM |
6305 | if (trace_empty(iter)) { |
6306 | sret = 0; | |
107bad8b | 6307 | goto out; |
ff98781b | 6308 | } |
b3806b43 SR |
6309 | |
6310 | if (cnt >= PAGE_SIZE) | |
6311 | cnt = PAGE_SIZE - 1; | |
6312 | ||
53d0aa77 | 6313 | /* reset all but tr, trace, and overruns */ |
53d0aa77 SR |
6314 | memset(&iter->seq, 0, |
6315 | sizeof(struct trace_iterator) - | |
6316 | offsetof(struct trace_iterator, seq)); | |
ed5467da | 6317 | cpumask_clear(iter->started); |
d303de1f | 6318 | trace_seq_init(&iter->seq); |
4823ed7e | 6319 | iter->pos = -1; |
b3806b43 | 6320 | |
4f535968 | 6321 | trace_event_read_lock(); |
7e53bd42 | 6322 | trace_access_lock(iter->cpu_file); |
955b61e5 | 6323 | while (trace_find_next_entry_inc(iter) != NULL) { |
2c4f035f | 6324 | enum print_line_t ret; |
5ac48378 | 6325 | int save_len = iter->seq.seq.len; |
088b1e42 | 6326 | |
f9896bf3 | 6327 | ret = print_trace_line(iter); |
2c4f035f | 6328 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
088b1e42 | 6329 | /* don't print partial lines */ |
5ac48378 | 6330 | iter->seq.seq.len = save_len; |
b3806b43 | 6331 | break; |
088b1e42 | 6332 | } |
b91facc3 FW |
6333 | if (ret != TRACE_TYPE_NO_CONSUME) |
6334 | trace_consume(iter); | |
b3806b43 | 6335 | |
5ac48378 | 6336 | if (trace_seq_used(&iter->seq) >= cnt) |
b3806b43 | 6337 | break; |
ee5e51f5 JO |
6338 | |
6339 | /* | |
6340 | * Setting the full flag means we reached the trace_seq buffer | |
6341 | * size and we should leave by partial output condition above. | |
6342 | * One of the trace_seq_* functions is not used properly. | |
6343 | */ | |
6344 | WARN_ONCE(iter->seq.full, "full flag set for trace type %d", | |
6345 | iter->ent->type); | |
b3806b43 | 6346 | } |
7e53bd42 | 6347 | trace_access_unlock(iter->cpu_file); |
4f535968 | 6348 | trace_event_read_unlock(); |
b3806b43 | 6349 | |
b3806b43 | 6350 | /* Now copy what we have to the user */ |
6c6c2796 | 6351 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
5ac48378 | 6352 | if (iter->seq.seq.readpos >= trace_seq_used(&iter->seq)) |
f9520750 | 6353 | trace_seq_init(&iter->seq); |
9ff4b974 PP |
6354 | |
6355 | /* | |
25985edc | 6356 | * If there was nothing to send to user, in spite of consuming trace |
9ff4b974 PP |
6357 | * entries, go back to wait for more entries. |
6358 | */ | |
6c6c2796 | 6359 | if (sret == -EBUSY) |
9ff4b974 | 6360 | goto waitagain; |
b3806b43 | 6361 | |
107bad8b | 6362 | out: |
d7350c3f | 6363 | mutex_unlock(&iter->mutex); |
107bad8b | 6364 | |
6c6c2796 | 6365 | return sret; |
b3806b43 SR |
6366 | } |
6367 | ||
3c56819b EGM |
6368 | static void tracing_spd_release_pipe(struct splice_pipe_desc *spd, |
6369 | unsigned int idx) | |
6370 | { | |
6371 | __free_page(spd->pages[idx]); | |
6372 | } | |
6373 | ||
34cd4998 | 6374 | static size_t |
fa7c7f6e | 6375 | tracing_fill_pipe_page(size_t rem, struct trace_iterator *iter) |
34cd4998 SR |
6376 | { |
6377 | size_t count; | |
74f06bb7 | 6378 | int save_len; |
34cd4998 SR |
6379 | int ret; |
6380 | ||
6381 | /* Seq buffer is page-sized, exactly what we need. */ | |
6382 | for (;;) { | |
74f06bb7 | 6383 | save_len = iter->seq.seq.len; |
34cd4998 | 6384 | ret = print_trace_line(iter); |
74f06bb7 SRRH |
6385 | |
6386 | if (trace_seq_has_overflowed(&iter->seq)) { | |
6387 | iter->seq.seq.len = save_len; | |
34cd4998 SR |
6388 | break; |
6389 | } | |
74f06bb7 SRRH |
6390 | |
6391 | /* | |
6392 | * This should not be hit, because it should only | |
6393 | * be set if the iter->seq overflowed. But check it | |
6394 | * anyway to be safe. | |
6395 | */ | |
34cd4998 | 6396 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
74f06bb7 SRRH |
6397 | iter->seq.seq.len = save_len; |
6398 | break; | |
6399 | } | |
6400 | ||
5ac48378 | 6401 | count = trace_seq_used(&iter->seq) - save_len; |
74f06bb7 SRRH |
6402 | if (rem < count) { |
6403 | rem = 0; | |
6404 | iter->seq.seq.len = save_len; | |
34cd4998 SR |
6405 | break; |
6406 | } | |
6407 | ||
74e7ff8c LJ |
6408 | if (ret != TRACE_TYPE_NO_CONSUME) |
6409 | trace_consume(iter); | |
34cd4998 | 6410 | rem -= count; |
955b61e5 | 6411 | if (!trace_find_next_entry_inc(iter)) { |
34cd4998 SR |
6412 | rem = 0; |
6413 | iter->ent = NULL; | |
6414 | break; | |
6415 | } | |
6416 | } | |
6417 | ||
6418 | return rem; | |
6419 | } | |
6420 | ||
3c56819b EGM |
6421 | static ssize_t tracing_splice_read_pipe(struct file *filp, |
6422 | loff_t *ppos, | |
6423 | struct pipe_inode_info *pipe, | |
6424 | size_t len, | |
6425 | unsigned int flags) | |
6426 | { | |
35f3d14d JA |
6427 | struct page *pages_def[PIPE_DEF_BUFFERS]; |
6428 | struct partial_page partial_def[PIPE_DEF_BUFFERS]; | |
3c56819b EGM |
6429 | struct trace_iterator *iter = filp->private_data; |
6430 | struct splice_pipe_desc spd = { | |
35f3d14d JA |
6431 | .pages = pages_def, |
6432 | .partial = partial_def, | |
34cd4998 | 6433 | .nr_pages = 0, /* This gets updated below. */ |
047fe360 | 6434 | .nr_pages_max = PIPE_DEF_BUFFERS, |
6797d97a | 6435 | .ops = &default_pipe_buf_ops, |
34cd4998 | 6436 | .spd_release = tracing_spd_release_pipe, |
3c56819b EGM |
6437 | }; |
6438 | ssize_t ret; | |
34cd4998 | 6439 | size_t rem; |
3c56819b EGM |
6440 | unsigned int i; |
6441 | ||
35f3d14d JA |
6442 | if (splice_grow_spd(pipe, &spd)) |
6443 | return -ENOMEM; | |
6444 | ||
d7350c3f | 6445 | mutex_lock(&iter->mutex); |
3c56819b EGM |
6446 | |
6447 | if (iter->trace->splice_read) { | |
6448 | ret = iter->trace->splice_read(iter, filp, | |
6449 | ppos, pipe, len, flags); | |
6450 | if (ret) | |
34cd4998 | 6451 | goto out_err; |
3c56819b EGM |
6452 | } |
6453 | ||
6454 | ret = tracing_wait_pipe(filp); | |
6455 | if (ret <= 0) | |
34cd4998 | 6456 | goto out_err; |
3c56819b | 6457 | |
955b61e5 | 6458 | if (!iter->ent && !trace_find_next_entry_inc(iter)) { |
3c56819b | 6459 | ret = -EFAULT; |
34cd4998 | 6460 | goto out_err; |
3c56819b EGM |
6461 | } |
6462 | ||
4f535968 | 6463 | trace_event_read_lock(); |
7e53bd42 | 6464 | trace_access_lock(iter->cpu_file); |
4f535968 | 6465 | |
3c56819b | 6466 | /* Fill as many pages as possible. */ |
a786c06d | 6467 | for (i = 0, rem = len; i < spd.nr_pages_max && rem; i++) { |
35f3d14d JA |
6468 | spd.pages[i] = alloc_page(GFP_KERNEL); |
6469 | if (!spd.pages[i]) | |
34cd4998 | 6470 | break; |
3c56819b | 6471 | |
fa7c7f6e | 6472 | rem = tracing_fill_pipe_page(rem, iter); |
3c56819b EGM |
6473 | |
6474 | /* Copy the data into the page, so we can start over. */ | |
6475 | ret = trace_seq_to_buffer(&iter->seq, | |
35f3d14d | 6476 | page_address(spd.pages[i]), |
5ac48378 | 6477 | trace_seq_used(&iter->seq)); |
3c56819b | 6478 | if (ret < 0) { |
35f3d14d | 6479 | __free_page(spd.pages[i]); |
3c56819b EGM |
6480 | break; |
6481 | } | |
35f3d14d | 6482 | spd.partial[i].offset = 0; |
5ac48378 | 6483 | spd.partial[i].len = trace_seq_used(&iter->seq); |
3c56819b | 6484 | |
f9520750 | 6485 | trace_seq_init(&iter->seq); |
3c56819b EGM |
6486 | } |
6487 | ||
7e53bd42 | 6488 | trace_access_unlock(iter->cpu_file); |
4f535968 | 6489 | trace_event_read_unlock(); |
d7350c3f | 6490 | mutex_unlock(&iter->mutex); |
3c56819b EGM |
6491 | |
6492 | spd.nr_pages = i; | |
6493 | ||
a29054d9 SRRH |
6494 | if (i) |
6495 | ret = splice_to_pipe(pipe, &spd); | |
6496 | else | |
6497 | ret = 0; | |
35f3d14d | 6498 | out: |
047fe360 | 6499 | splice_shrink_spd(&spd); |
35f3d14d | 6500 | return ret; |
3c56819b | 6501 | |
34cd4998 | 6502 | out_err: |
d7350c3f | 6503 | mutex_unlock(&iter->mutex); |
35f3d14d | 6504 | goto out; |
3c56819b EGM |
6505 | } |
6506 | ||
a98a3c3f SR |
6507 | static ssize_t |
6508 | tracing_entries_read(struct file *filp, char __user *ubuf, | |
6509 | size_t cnt, loff_t *ppos) | |
6510 | { | |
0bc392ee ON |
6511 | struct inode *inode = file_inode(filp); |
6512 | struct trace_array *tr = inode->i_private; | |
6513 | int cpu = tracing_get_cpu(inode); | |
438ced17 VN |
6514 | char buf[64]; |
6515 | int r = 0; | |
6516 | ssize_t ret; | |
a98a3c3f | 6517 | |
db526ca3 | 6518 | mutex_lock(&trace_types_lock); |
438ced17 | 6519 | |
0bc392ee | 6520 | if (cpu == RING_BUFFER_ALL_CPUS) { |
438ced17 VN |
6521 | int cpu, buf_size_same; |
6522 | unsigned long size; | |
6523 | ||
6524 | size = 0; | |
6525 | buf_size_same = 1; | |
6526 | /* check if all cpu sizes are same */ | |
6527 | for_each_tracing_cpu(cpu) { | |
6528 | /* fill in the size from first enabled cpu */ | |
6529 | if (size == 0) | |
1c5eb448 SRV |
6530 | size = per_cpu_ptr(tr->array_buffer.data, cpu)->entries; |
6531 | if (size != per_cpu_ptr(tr->array_buffer.data, cpu)->entries) { | |
438ced17 VN |
6532 | buf_size_same = 0; |
6533 | break; | |
6534 | } | |
6535 | } | |
6536 | ||
6537 | if (buf_size_same) { | |
6538 | if (!ring_buffer_expanded) | |
6539 | r = sprintf(buf, "%lu (expanded: %lu)\n", | |
6540 | size >> 10, | |
6541 | trace_buf_size >> 10); | |
6542 | else | |
6543 | r = sprintf(buf, "%lu\n", size >> 10); | |
6544 | } else | |
6545 | r = sprintf(buf, "X\n"); | |
6546 | } else | |
1c5eb448 | 6547 | r = sprintf(buf, "%lu\n", per_cpu_ptr(tr->array_buffer.data, cpu)->entries >> 10); |
438ced17 | 6548 | |
db526ca3 SR |
6549 | mutex_unlock(&trace_types_lock); |
6550 | ||
438ced17 VN |
6551 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
6552 | return ret; | |
a98a3c3f SR |
6553 | } |
6554 | ||
6555 | static ssize_t | |
6556 | tracing_entries_write(struct file *filp, const char __user *ubuf, | |
6557 | size_t cnt, loff_t *ppos) | |
6558 | { | |
0bc392ee ON |
6559 | struct inode *inode = file_inode(filp); |
6560 | struct trace_array *tr = inode->i_private; | |
a98a3c3f | 6561 | unsigned long val; |
4f271a2a | 6562 | int ret; |
a98a3c3f | 6563 | |
22fe9b54 PH |
6564 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
6565 | if (ret) | |
c6caeeb1 | 6566 | return ret; |
a98a3c3f SR |
6567 | |
6568 | /* must have at least 1 entry */ | |
6569 | if (!val) | |
6570 | return -EINVAL; | |
6571 | ||
1696b2b0 SR |
6572 | /* value is in KB */ |
6573 | val <<= 10; | |
0bc392ee | 6574 | ret = tracing_resize_ring_buffer(tr, val, tracing_get_cpu(inode)); |
4f271a2a VN |
6575 | if (ret < 0) |
6576 | return ret; | |
a98a3c3f | 6577 | |
cf8517cf | 6578 | *ppos += cnt; |
a98a3c3f | 6579 | |
4f271a2a VN |
6580 | return cnt; |
6581 | } | |
bf5e6519 | 6582 | |
f81ab074 VN |
6583 | static ssize_t |
6584 | tracing_total_entries_read(struct file *filp, char __user *ubuf, | |
6585 | size_t cnt, loff_t *ppos) | |
6586 | { | |
6587 | struct trace_array *tr = filp->private_data; | |
6588 | char buf[64]; | |
6589 | int r, cpu; | |
6590 | unsigned long size = 0, expanded_size = 0; | |
6591 | ||
6592 | mutex_lock(&trace_types_lock); | |
6593 | for_each_tracing_cpu(cpu) { | |
1c5eb448 | 6594 | size += per_cpu_ptr(tr->array_buffer.data, cpu)->entries >> 10; |
f81ab074 VN |
6595 | if (!ring_buffer_expanded) |
6596 | expanded_size += trace_buf_size >> 10; | |
6597 | } | |
6598 | if (ring_buffer_expanded) | |
6599 | r = sprintf(buf, "%lu\n", size); | |
6600 | else | |
6601 | r = sprintf(buf, "%lu (expanded: %lu)\n", size, expanded_size); | |
6602 | mutex_unlock(&trace_types_lock); | |
6603 | ||
6604 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
6605 | } | |
6606 | ||
4f271a2a VN |
6607 | static ssize_t |
6608 | tracing_free_buffer_write(struct file *filp, const char __user *ubuf, | |
6609 | size_t cnt, loff_t *ppos) | |
6610 | { | |
6611 | /* | |
6612 | * There is no need to read what the user has written, this function | |
6613 | * is just to make sure that there is no error when "echo" is used | |
6614 | */ | |
6615 | ||
6616 | *ppos += cnt; | |
a98a3c3f SR |
6617 | |
6618 | return cnt; | |
6619 | } | |
6620 | ||
4f271a2a VN |
6621 | static int |
6622 | tracing_free_buffer_release(struct inode *inode, struct file *filp) | |
6623 | { | |
2b6080f2 SR |
6624 | struct trace_array *tr = inode->i_private; |
6625 | ||
cf30cf67 | 6626 | /* disable tracing ? */ |
983f938a | 6627 | if (tr->trace_flags & TRACE_ITER_STOP_ON_FREE) |
711e1243 | 6628 | tracer_tracing_off(tr); |
4f271a2a | 6629 | /* resize the ring buffer to 0 */ |
2b6080f2 | 6630 | tracing_resize_ring_buffer(tr, 0, RING_BUFFER_ALL_CPUS); |
4f271a2a | 6631 | |
7b85af63 SRRH |
6632 | trace_array_put(tr); |
6633 | ||
4f271a2a VN |
6634 | return 0; |
6635 | } | |
6636 | ||
5bf9a1ee PP |
6637 | static ssize_t |
6638 | tracing_mark_write(struct file *filp, const char __user *ubuf, | |
6639 | size_t cnt, loff_t *fpos) | |
6640 | { | |
2d71619c | 6641 | struct trace_array *tr = filp->private_data; |
d696b58c | 6642 | struct ring_buffer_event *event; |
3dd80953 | 6643 | enum event_trigger_type tt = ETT_NONE; |
13292494 | 6644 | struct trace_buffer *buffer; |
d696b58c SR |
6645 | struct print_entry *entry; |
6646 | unsigned long irq_flags; | |
d696b58c | 6647 | ssize_t written; |
d696b58c SR |
6648 | int size; |
6649 | int len; | |
fa32e855 | 6650 | |
656c7f0d | 6651 | /* Used in tracing_mark_raw_write() as well */ |
0f5e5a3a RV |
6652 | #define FAULTED_STR "<faulted>" |
6653 | #define FAULTED_SIZE (sizeof(FAULTED_STR) - 1) /* '\0' is already accounted for */ | |
5bf9a1ee | 6654 | |
c76f0694 | 6655 | if (tracing_disabled) |
5bf9a1ee PP |
6656 | return -EINVAL; |
6657 | ||
983f938a | 6658 | if (!(tr->trace_flags & TRACE_ITER_MARKERS)) |
5224c3a3 MSB |
6659 | return -EINVAL; |
6660 | ||
5bf9a1ee PP |
6661 | if (cnt > TRACE_BUF_SIZE) |
6662 | cnt = TRACE_BUF_SIZE; | |
6663 | ||
d696b58c | 6664 | BUILD_BUG_ON(TRACE_BUF_SIZE >= PAGE_SIZE); |
5bf9a1ee | 6665 | |
d696b58c | 6666 | local_save_flags(irq_flags); |
656c7f0d | 6667 | size = sizeof(*entry) + cnt + 2; /* add '\0' and possible '\n' */ |
d696b58c | 6668 | |
656c7f0d SRRH |
6669 | /* If less than "<faulted>", then make sure we can still add that */ |
6670 | if (cnt < FAULTED_SIZE) | |
6671 | size += FAULTED_SIZE - cnt; | |
d696b58c | 6672 | |
1c5eb448 | 6673 | buffer = tr->array_buffer.buffer; |
3e9a8aad SRRH |
6674 | event = __trace_buffer_lock_reserve(buffer, TRACE_PRINT, size, |
6675 | irq_flags, preempt_count()); | |
656c7f0d | 6676 | if (unlikely(!event)) |
d696b58c | 6677 | /* Ring buffer disabled, return as if not open for write */ |
656c7f0d | 6678 | return -EBADF; |
d696b58c SR |
6679 | |
6680 | entry = ring_buffer_event_data(event); | |
6681 | entry->ip = _THIS_IP_; | |
6682 | ||
656c7f0d SRRH |
6683 | len = __copy_from_user_inatomic(&entry->buf, ubuf, cnt); |
6684 | if (len) { | |
0f5e5a3a | 6685 | memcpy(&entry->buf, FAULTED_STR, FAULTED_SIZE); |
656c7f0d SRRH |
6686 | cnt = FAULTED_SIZE; |
6687 | written = -EFAULT; | |
c13d2f7c | 6688 | } else |
656c7f0d | 6689 | written = cnt; |
5bf9a1ee | 6690 | |
3dd80953 SRV |
6691 | if (tr->trace_marker_file && !list_empty(&tr->trace_marker_file->triggers)) { |
6692 | /* do not add \n before testing triggers, but add \0 */ | |
6693 | entry->buf[cnt] = '\0'; | |
6694 | tt = event_triggers_call(tr->trace_marker_file, entry, event); | |
6695 | } | |
6696 | ||
d696b58c SR |
6697 | if (entry->buf[cnt - 1] != '\n') { |
6698 | entry->buf[cnt] = '\n'; | |
6699 | entry->buf[cnt + 1] = '\0'; | |
6700 | } else | |
6701 | entry->buf[cnt] = '\0'; | |
6702 | ||
458999c6 TZ |
6703 | if (static_branch_unlikely(&trace_marker_exports_enabled)) |
6704 | ftrace_exports(event, TRACE_EXPORT_MARKER); | |
7ffbd48d | 6705 | __buffer_unlock_commit(buffer, event); |
5bf9a1ee | 6706 | |
3dd80953 SRV |
6707 | if (tt) |
6708 | event_triggers_post_call(tr->trace_marker_file, tt); | |
6709 | ||
656c7f0d SRRH |
6710 | if (written > 0) |
6711 | *fpos += written; | |
5bf9a1ee | 6712 | |
fa32e855 SR |
6713 | return written; |
6714 | } | |
6715 | ||
6716 | /* Limit it for now to 3K (including tag) */ | |
6717 | #define RAW_DATA_MAX_SIZE (1024*3) | |
6718 | ||
6719 | static ssize_t | |
6720 | tracing_mark_raw_write(struct file *filp, const char __user *ubuf, | |
6721 | size_t cnt, loff_t *fpos) | |
6722 | { | |
6723 | struct trace_array *tr = filp->private_data; | |
6724 | struct ring_buffer_event *event; | |
13292494 | 6725 | struct trace_buffer *buffer; |
fa32e855 SR |
6726 | struct raw_data_entry *entry; |
6727 | unsigned long irq_flags; | |
fa32e855 | 6728 | ssize_t written; |
fa32e855 SR |
6729 | int size; |
6730 | int len; | |
6731 | ||
656c7f0d SRRH |
6732 | #define FAULT_SIZE_ID (FAULTED_SIZE + sizeof(int)) |
6733 | ||
fa32e855 SR |
6734 | if (tracing_disabled) |
6735 | return -EINVAL; | |
6736 | ||
6737 | if (!(tr->trace_flags & TRACE_ITER_MARKERS)) | |
6738 | return -EINVAL; | |
6739 | ||
6740 | /* The marker must at least have a tag id */ | |
6741 | if (cnt < sizeof(unsigned int) || cnt > RAW_DATA_MAX_SIZE) | |
6742 | return -EINVAL; | |
6743 | ||
6744 | if (cnt > TRACE_BUF_SIZE) | |
6745 | cnt = TRACE_BUF_SIZE; | |
6746 | ||
6747 | BUILD_BUG_ON(TRACE_BUF_SIZE >= PAGE_SIZE); | |
6748 | ||
fa32e855 SR |
6749 | local_save_flags(irq_flags); |
6750 | size = sizeof(*entry) + cnt; | |
656c7f0d SRRH |
6751 | if (cnt < FAULT_SIZE_ID) |
6752 | size += FAULT_SIZE_ID - cnt; | |
6753 | ||
1c5eb448 | 6754 | buffer = tr->array_buffer.buffer; |
3e9a8aad SRRH |
6755 | event = __trace_buffer_lock_reserve(buffer, TRACE_RAW_DATA, size, |
6756 | irq_flags, preempt_count()); | |
656c7f0d | 6757 | if (!event) |
fa32e855 | 6758 | /* Ring buffer disabled, return as if not open for write */ |
656c7f0d | 6759 | return -EBADF; |
fa32e855 SR |
6760 | |
6761 | entry = ring_buffer_event_data(event); | |
6762 | ||
656c7f0d SRRH |
6763 | len = __copy_from_user_inatomic(&entry->id, ubuf, cnt); |
6764 | if (len) { | |
6765 | entry->id = -1; | |
0f5e5a3a | 6766 | memcpy(&entry->buf, FAULTED_STR, FAULTED_SIZE); |
656c7f0d | 6767 | written = -EFAULT; |
fa32e855 | 6768 | } else |
656c7f0d | 6769 | written = cnt; |
fa32e855 SR |
6770 | |
6771 | __buffer_unlock_commit(buffer, event); | |
6772 | ||
656c7f0d SRRH |
6773 | if (written > 0) |
6774 | *fpos += written; | |
1aa54bca MS |
6775 | |
6776 | return written; | |
5bf9a1ee PP |
6777 | } |
6778 | ||
13f16d20 | 6779 | static int tracing_clock_show(struct seq_file *m, void *v) |
5079f326 | 6780 | { |
2b6080f2 | 6781 | struct trace_array *tr = m->private; |
5079f326 Z |
6782 | int i; |
6783 | ||
6784 | for (i = 0; i < ARRAY_SIZE(trace_clocks); i++) | |
13f16d20 | 6785 | seq_printf(m, |
5079f326 | 6786 | "%s%s%s%s", i ? " " : "", |
2b6080f2 SR |
6787 | i == tr->clock_id ? "[" : "", trace_clocks[i].name, |
6788 | i == tr->clock_id ? "]" : ""); | |
13f16d20 | 6789 | seq_putc(m, '\n'); |
5079f326 | 6790 | |
13f16d20 | 6791 | return 0; |
5079f326 Z |
6792 | } |
6793 | ||
d71bd34d | 6794 | int tracing_set_clock(struct trace_array *tr, const char *clockstr) |
5079f326 | 6795 | { |
5079f326 Z |
6796 | int i; |
6797 | ||
5079f326 Z |
6798 | for (i = 0; i < ARRAY_SIZE(trace_clocks); i++) { |
6799 | if (strcmp(trace_clocks[i].name, clockstr) == 0) | |
6800 | break; | |
6801 | } | |
6802 | if (i == ARRAY_SIZE(trace_clocks)) | |
6803 | return -EINVAL; | |
6804 | ||
5079f326 Z |
6805 | mutex_lock(&trace_types_lock); |
6806 | ||
2b6080f2 SR |
6807 | tr->clock_id = i; |
6808 | ||
1c5eb448 | 6809 | ring_buffer_set_clock(tr->array_buffer.buffer, trace_clocks[i].func); |
5079f326 | 6810 | |
60303ed3 DS |
6811 | /* |
6812 | * New clock may not be consistent with the previous clock. | |
6813 | * Reset the buffer so that it doesn't have incomparable timestamps. | |
6814 | */ | |
1c5eb448 | 6815 | tracing_reset_online_cpus(&tr->array_buffer); |
12883efb SRRH |
6816 | |
6817 | #ifdef CONFIG_TRACER_MAX_TRACE | |
170b3b10 | 6818 | if (tr->max_buffer.buffer) |
12883efb | 6819 | ring_buffer_set_clock(tr->max_buffer.buffer, trace_clocks[i].func); |
9457158b | 6820 | tracing_reset_online_cpus(&tr->max_buffer); |
12883efb | 6821 | #endif |
60303ed3 | 6822 | |
5079f326 Z |
6823 | mutex_unlock(&trace_types_lock); |
6824 | ||
e1e232ca SR |
6825 | return 0; |
6826 | } | |
6827 | ||
6828 | static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf, | |
6829 | size_t cnt, loff_t *fpos) | |
6830 | { | |
6831 | struct seq_file *m = filp->private_data; | |
6832 | struct trace_array *tr = m->private; | |
6833 | char buf[64]; | |
6834 | const char *clockstr; | |
6835 | int ret; | |
6836 | ||
6837 | if (cnt >= sizeof(buf)) | |
6838 | return -EINVAL; | |
6839 | ||
4afe6495 | 6840 | if (copy_from_user(buf, ubuf, cnt)) |
e1e232ca SR |
6841 | return -EFAULT; |
6842 | ||
6843 | buf[cnt] = 0; | |
6844 | ||
6845 | clockstr = strstrip(buf); | |
6846 | ||
6847 | ret = tracing_set_clock(tr, clockstr); | |
6848 | if (ret) | |
6849 | return ret; | |
6850 | ||
5079f326 Z |
6851 | *fpos += cnt; |
6852 | ||
6853 | return cnt; | |
6854 | } | |
6855 | ||
13f16d20 LZ |
6856 | static int tracing_clock_open(struct inode *inode, struct file *file) |
6857 | { | |
7b85af63 SRRH |
6858 | struct trace_array *tr = inode->i_private; |
6859 | int ret; | |
6860 | ||
8530dec6 SRV |
6861 | ret = tracing_check_open_get_tr(tr); |
6862 | if (ret) | |
6863 | return ret; | |
7b85af63 SRRH |
6864 | |
6865 | ret = single_open(file, tracing_clock_show, inode->i_private); | |
6866 | if (ret < 0) | |
6867 | trace_array_put(tr); | |
6868 | ||
6869 | return ret; | |
13f16d20 LZ |
6870 | } |
6871 | ||
2c1ea60b TZ |
6872 | static int tracing_time_stamp_mode_show(struct seq_file *m, void *v) |
6873 | { | |
6874 | struct trace_array *tr = m->private; | |
6875 | ||
6876 | mutex_lock(&trace_types_lock); | |
6877 | ||
1c5eb448 | 6878 | if (ring_buffer_time_stamp_abs(tr->array_buffer.buffer)) |
2c1ea60b TZ |
6879 | seq_puts(m, "delta [absolute]\n"); |
6880 | else | |
6881 | seq_puts(m, "[delta] absolute\n"); | |
6882 | ||
6883 | mutex_unlock(&trace_types_lock); | |
6884 | ||
6885 | return 0; | |
6886 | } | |
6887 | ||
6888 | static int tracing_time_stamp_mode_open(struct inode *inode, struct file *file) | |
6889 | { | |
6890 | struct trace_array *tr = inode->i_private; | |
6891 | int ret; | |
6892 | ||
8530dec6 SRV |
6893 | ret = tracing_check_open_get_tr(tr); |
6894 | if (ret) | |
6895 | return ret; | |
2c1ea60b TZ |
6896 | |
6897 | ret = single_open(file, tracing_time_stamp_mode_show, inode->i_private); | |
6898 | if (ret < 0) | |
6899 | trace_array_put(tr); | |
6900 | ||
6901 | return ret; | |
6902 | } | |
6903 | ||
00b41452 TZ |
6904 | int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs) |
6905 | { | |
6906 | int ret = 0; | |
6907 | ||
6908 | mutex_lock(&trace_types_lock); | |
6909 | ||
6910 | if (abs && tr->time_stamp_abs_ref++) | |
6911 | goto out; | |
6912 | ||
6913 | if (!abs) { | |
6914 | if (WARN_ON_ONCE(!tr->time_stamp_abs_ref)) { | |
6915 | ret = -EINVAL; | |
6916 | goto out; | |
6917 | } | |
6918 | ||
6919 | if (--tr->time_stamp_abs_ref) | |
6920 | goto out; | |
6921 | } | |
6922 | ||
1c5eb448 | 6923 | ring_buffer_set_time_stamp_abs(tr->array_buffer.buffer, abs); |
00b41452 TZ |
6924 | |
6925 | #ifdef CONFIG_TRACER_MAX_TRACE | |
6926 | if (tr->max_buffer.buffer) | |
6927 | ring_buffer_set_time_stamp_abs(tr->max_buffer.buffer, abs); | |
6928 | #endif | |
6929 | out: | |
6930 | mutex_unlock(&trace_types_lock); | |
6931 | ||
6932 | return ret; | |
6933 | } | |
6934 | ||
6de58e62 SRRH |
6935 | struct ftrace_buffer_info { |
6936 | struct trace_iterator iter; | |
6937 | void *spare; | |
73a757e6 | 6938 | unsigned int spare_cpu; |
6de58e62 SRRH |
6939 | unsigned int read; |
6940 | }; | |
6941 | ||
debdd57f HT |
6942 | #ifdef CONFIG_TRACER_SNAPSHOT |
6943 | static int tracing_snapshot_open(struct inode *inode, struct file *file) | |
6944 | { | |
6484c71c | 6945 | struct trace_array *tr = inode->i_private; |
debdd57f | 6946 | struct trace_iterator *iter; |
2b6080f2 | 6947 | struct seq_file *m; |
8530dec6 | 6948 | int ret; |
debdd57f | 6949 | |
8530dec6 SRV |
6950 | ret = tracing_check_open_get_tr(tr); |
6951 | if (ret) | |
6952 | return ret; | |
ff451961 | 6953 | |
debdd57f | 6954 | if (file->f_mode & FMODE_READ) { |
6484c71c | 6955 | iter = __tracing_open(inode, file, true); |
debdd57f HT |
6956 | if (IS_ERR(iter)) |
6957 | ret = PTR_ERR(iter); | |
2b6080f2 SR |
6958 | } else { |
6959 | /* Writes still need the seq_file to hold the private data */ | |
f77d09a3 | 6960 | ret = -ENOMEM; |
2b6080f2 SR |
6961 | m = kzalloc(sizeof(*m), GFP_KERNEL); |
6962 | if (!m) | |
f77d09a3 | 6963 | goto out; |
2b6080f2 SR |
6964 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
6965 | if (!iter) { | |
6966 | kfree(m); | |
f77d09a3 | 6967 | goto out; |
2b6080f2 | 6968 | } |
f77d09a3 AL |
6969 | ret = 0; |
6970 | ||
ff451961 | 6971 | iter->tr = tr; |
1c5eb448 | 6972 | iter->array_buffer = &tr->max_buffer; |
6484c71c | 6973 | iter->cpu_file = tracing_get_cpu(inode); |
2b6080f2 SR |
6974 | m->private = iter; |
6975 | file->private_data = m; | |
debdd57f | 6976 | } |
f77d09a3 | 6977 | out: |
ff451961 SRRH |
6978 | if (ret < 0) |
6979 | trace_array_put(tr); | |
6980 | ||
debdd57f HT |
6981 | return ret; |
6982 | } | |
6983 | ||
6984 | static ssize_t | |
6985 | tracing_snapshot_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
6986 | loff_t *ppos) | |
6987 | { | |
2b6080f2 SR |
6988 | struct seq_file *m = filp->private_data; |
6989 | struct trace_iterator *iter = m->private; | |
6990 | struct trace_array *tr = iter->tr; | |
debdd57f HT |
6991 | unsigned long val; |
6992 | int ret; | |
6993 | ||
6994 | ret = tracing_update_buffers(); | |
6995 | if (ret < 0) | |
6996 | return ret; | |
6997 | ||
6998 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); | |
6999 | if (ret) | |
7000 | return ret; | |
7001 | ||
7002 | mutex_lock(&trace_types_lock); | |
7003 | ||
2b6080f2 | 7004 | if (tr->current_trace->use_max_tr) { |
debdd57f HT |
7005 | ret = -EBUSY; |
7006 | goto out; | |
7007 | } | |
7008 | ||
a35873a0 TZ |
7009 | arch_spin_lock(&tr->max_lock); |
7010 | if (tr->cond_snapshot) | |
7011 | ret = -EBUSY; | |
7012 | arch_spin_unlock(&tr->max_lock); | |
7013 | if (ret) | |
7014 | goto out; | |
7015 | ||
debdd57f HT |
7016 | switch (val) { |
7017 | case 0: | |
f1affcaa SRRH |
7018 | if (iter->cpu_file != RING_BUFFER_ALL_CPUS) { |
7019 | ret = -EINVAL; | |
7020 | break; | |
debdd57f | 7021 | } |
3209cff4 SRRH |
7022 | if (tr->allocated_snapshot) |
7023 | free_snapshot(tr); | |
debdd57f HT |
7024 | break; |
7025 | case 1: | |
f1affcaa SRRH |
7026 | /* Only allow per-cpu swap if the ring buffer supports it */ |
7027 | #ifndef CONFIG_RING_BUFFER_ALLOW_SWAP | |
7028 | if (iter->cpu_file != RING_BUFFER_ALL_CPUS) { | |
7029 | ret = -EINVAL; | |
7030 | break; | |
7031 | } | |
7032 | #endif | |
46cc0b44 ET |
7033 | if (tr->allocated_snapshot) |
7034 | ret = resize_buffer_duplicate_size(&tr->max_buffer, | |
1c5eb448 | 7035 | &tr->array_buffer, iter->cpu_file); |
46cc0b44 | 7036 | else |
2824f503 | 7037 | ret = tracing_alloc_snapshot_instance(tr); |
46cc0b44 ET |
7038 | if (ret < 0) |
7039 | break; | |
debdd57f HT |
7040 | local_irq_disable(); |
7041 | /* Now, we're going to swap */ | |
f1affcaa | 7042 | if (iter->cpu_file == RING_BUFFER_ALL_CPUS) |
a35873a0 | 7043 | update_max_tr(tr, current, smp_processor_id(), NULL); |
f1affcaa | 7044 | else |
ce9bae55 | 7045 | update_max_tr_single(tr, current, iter->cpu_file); |
debdd57f HT |
7046 | local_irq_enable(); |
7047 | break; | |
7048 | default: | |
45ad21ca | 7049 | if (tr->allocated_snapshot) { |
f1affcaa SRRH |
7050 | if (iter->cpu_file == RING_BUFFER_ALL_CPUS) |
7051 | tracing_reset_online_cpus(&tr->max_buffer); | |
7052 | else | |
a47b53e9 | 7053 | tracing_reset_cpu(&tr->max_buffer, iter->cpu_file); |
f1affcaa | 7054 | } |
debdd57f HT |
7055 | break; |
7056 | } | |
7057 | ||
7058 | if (ret >= 0) { | |
7059 | *ppos += cnt; | |
7060 | ret = cnt; | |
7061 | } | |
7062 | out: | |
7063 | mutex_unlock(&trace_types_lock); | |
7064 | return ret; | |
7065 | } | |
2b6080f2 SR |
7066 | |
7067 | static int tracing_snapshot_release(struct inode *inode, struct file *file) | |
7068 | { | |
7069 | struct seq_file *m = file->private_data; | |
ff451961 SRRH |
7070 | int ret; |
7071 | ||
7072 | ret = tracing_release(inode, file); | |
2b6080f2 SR |
7073 | |
7074 | if (file->f_mode & FMODE_READ) | |
ff451961 | 7075 | return ret; |
2b6080f2 SR |
7076 | |
7077 | /* If write only, the seq_file is just a stub */ | |
7078 | if (m) | |
7079 | kfree(m->private); | |
7080 | kfree(m); | |
7081 | ||
7082 | return 0; | |
7083 | } | |
7084 | ||
6de58e62 SRRH |
7085 | static int tracing_buffers_open(struct inode *inode, struct file *filp); |
7086 | static ssize_t tracing_buffers_read(struct file *filp, char __user *ubuf, | |
7087 | size_t count, loff_t *ppos); | |
7088 | static int tracing_buffers_release(struct inode *inode, struct file *file); | |
7089 | static ssize_t tracing_buffers_splice_read(struct file *file, loff_t *ppos, | |
7090 | struct pipe_inode_info *pipe, size_t len, unsigned int flags); | |
7091 | ||
7092 | static int snapshot_raw_open(struct inode *inode, struct file *filp) | |
7093 | { | |
7094 | struct ftrace_buffer_info *info; | |
7095 | int ret; | |
7096 | ||
17911ff3 | 7097 | /* The following checks for tracefs lockdown */ |
6de58e62 SRRH |
7098 | ret = tracing_buffers_open(inode, filp); |
7099 | if (ret < 0) | |
7100 | return ret; | |
7101 | ||
7102 | info = filp->private_data; | |
7103 | ||
7104 | if (info->iter.trace->use_max_tr) { | |
7105 | tracing_buffers_release(inode, filp); | |
7106 | return -EBUSY; | |
7107 | } | |
7108 | ||
7109 | info->iter.snapshot = true; | |
1c5eb448 | 7110 | info->iter.array_buffer = &info->iter.tr->max_buffer; |
6de58e62 SRRH |
7111 | |
7112 | return ret; | |
7113 | } | |
7114 | ||
debdd57f HT |
7115 | #endif /* CONFIG_TRACER_SNAPSHOT */ |
7116 | ||
7117 | ||
6508fa76 SF |
7118 | static const struct file_operations tracing_thresh_fops = { |
7119 | .open = tracing_open_generic, | |
7120 | .read = tracing_thresh_read, | |
7121 | .write = tracing_thresh_write, | |
7122 | .llseek = generic_file_llseek, | |
7123 | }; | |
7124 | ||
f971cc9a | 7125 | #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) |
5e2336a0 | 7126 | static const struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
7127 | .open = tracing_open_generic, |
7128 | .read = tracing_max_lat_read, | |
7129 | .write = tracing_max_lat_write, | |
b444786f | 7130 | .llseek = generic_file_llseek, |
bc0c38d1 | 7131 | }; |
e428abbb | 7132 | #endif |
bc0c38d1 | 7133 | |
5e2336a0 | 7134 | static const struct file_operations set_tracer_fops = { |
4bf39a94 IM |
7135 | .open = tracing_open_generic, |
7136 | .read = tracing_set_trace_read, | |
7137 | .write = tracing_set_trace_write, | |
b444786f | 7138 | .llseek = generic_file_llseek, |
bc0c38d1 SR |
7139 | }; |
7140 | ||
5e2336a0 | 7141 | static const struct file_operations tracing_pipe_fops = { |
4bf39a94 | 7142 | .open = tracing_open_pipe, |
2a2cc8f7 | 7143 | .poll = tracing_poll_pipe, |
4bf39a94 | 7144 | .read = tracing_read_pipe, |
3c56819b | 7145 | .splice_read = tracing_splice_read_pipe, |
4bf39a94 | 7146 | .release = tracing_release_pipe, |
b444786f | 7147 | .llseek = no_llseek, |
b3806b43 SR |
7148 | }; |
7149 | ||
5e2336a0 | 7150 | static const struct file_operations tracing_entries_fops = { |
0bc392ee | 7151 | .open = tracing_open_generic_tr, |
a98a3c3f SR |
7152 | .read = tracing_entries_read, |
7153 | .write = tracing_entries_write, | |
b444786f | 7154 | .llseek = generic_file_llseek, |
0bc392ee | 7155 | .release = tracing_release_generic_tr, |
a98a3c3f SR |
7156 | }; |
7157 | ||
f81ab074 | 7158 | static const struct file_operations tracing_total_entries_fops = { |
7b85af63 | 7159 | .open = tracing_open_generic_tr, |
f81ab074 VN |
7160 | .read = tracing_total_entries_read, |
7161 | .llseek = generic_file_llseek, | |
7b85af63 | 7162 | .release = tracing_release_generic_tr, |
f81ab074 VN |
7163 | }; |
7164 | ||
4f271a2a | 7165 | static const struct file_operations tracing_free_buffer_fops = { |
7b85af63 | 7166 | .open = tracing_open_generic_tr, |
4f271a2a VN |
7167 | .write = tracing_free_buffer_write, |
7168 | .release = tracing_free_buffer_release, | |
7169 | }; | |
7170 | ||
5e2336a0 | 7171 | static const struct file_operations tracing_mark_fops = { |
7b85af63 | 7172 | .open = tracing_open_generic_tr, |
5bf9a1ee | 7173 | .write = tracing_mark_write, |
b444786f | 7174 | .llseek = generic_file_llseek, |
7b85af63 | 7175 | .release = tracing_release_generic_tr, |
5bf9a1ee PP |
7176 | }; |
7177 | ||
fa32e855 SR |
7178 | static const struct file_operations tracing_mark_raw_fops = { |
7179 | .open = tracing_open_generic_tr, | |
7180 | .write = tracing_mark_raw_write, | |
7181 | .llseek = generic_file_llseek, | |
7182 | .release = tracing_release_generic_tr, | |
7183 | }; | |
7184 | ||
5079f326 | 7185 | static const struct file_operations trace_clock_fops = { |
13f16d20 LZ |
7186 | .open = tracing_clock_open, |
7187 | .read = seq_read, | |
7188 | .llseek = seq_lseek, | |
7b85af63 | 7189 | .release = tracing_single_release_tr, |
5079f326 Z |
7190 | .write = tracing_clock_write, |
7191 | }; | |
7192 | ||
2c1ea60b TZ |
7193 | static const struct file_operations trace_time_stamp_mode_fops = { |
7194 | .open = tracing_time_stamp_mode_open, | |
7195 | .read = seq_read, | |
7196 | .llseek = seq_lseek, | |
7197 | .release = tracing_single_release_tr, | |
7198 | }; | |
7199 | ||
debdd57f HT |
7200 | #ifdef CONFIG_TRACER_SNAPSHOT |
7201 | static const struct file_operations snapshot_fops = { | |
7202 | .open = tracing_snapshot_open, | |
7203 | .read = seq_read, | |
7204 | .write = tracing_snapshot_write, | |
098c879e | 7205 | .llseek = tracing_lseek, |
2b6080f2 | 7206 | .release = tracing_snapshot_release, |
debdd57f | 7207 | }; |
debdd57f | 7208 | |
6de58e62 SRRH |
7209 | static const struct file_operations snapshot_raw_fops = { |
7210 | .open = snapshot_raw_open, | |
7211 | .read = tracing_buffers_read, | |
7212 | .release = tracing_buffers_release, | |
7213 | .splice_read = tracing_buffers_splice_read, | |
7214 | .llseek = no_llseek, | |
2cadf913 SR |
7215 | }; |
7216 | ||
6de58e62 SRRH |
7217 | #endif /* CONFIG_TRACER_SNAPSHOT */ |
7218 | ||
8a062902 TZ |
7219 | #define TRACING_LOG_ERRS_MAX 8 |
7220 | #define TRACING_LOG_LOC_MAX 128 | |
7221 | ||
7222 | #define CMD_PREFIX " Command: " | |
7223 | ||
7224 | struct err_info { | |
7225 | const char **errs; /* ptr to loc-specific array of err strings */ | |
7226 | u8 type; /* index into errs -> specific err string */ | |
7227 | u8 pos; /* MAX_FILTER_STR_VAL = 256 */ | |
7228 | u64 ts; | |
7229 | }; | |
7230 | ||
7231 | struct tracing_log_err { | |
7232 | struct list_head list; | |
7233 | struct err_info info; | |
7234 | char loc[TRACING_LOG_LOC_MAX]; /* err location */ | |
7235 | char cmd[MAX_FILTER_STR_VAL]; /* what caused err */ | |
7236 | }; | |
7237 | ||
8a062902 TZ |
7238 | static DEFINE_MUTEX(tracing_err_log_lock); |
7239 | ||
ff585c5b | 7240 | static struct tracing_log_err *get_tracing_log_err(struct trace_array *tr) |
8a062902 TZ |
7241 | { |
7242 | struct tracing_log_err *err; | |
7243 | ||
2f754e77 | 7244 | if (tr->n_err_log_entries < TRACING_LOG_ERRS_MAX) { |
8a062902 TZ |
7245 | err = kzalloc(sizeof(*err), GFP_KERNEL); |
7246 | if (!err) | |
7247 | err = ERR_PTR(-ENOMEM); | |
2f754e77 | 7248 | tr->n_err_log_entries++; |
8a062902 TZ |
7249 | |
7250 | return err; | |
7251 | } | |
7252 | ||
2f754e77 | 7253 | err = list_first_entry(&tr->err_log, struct tracing_log_err, list); |
8a062902 TZ |
7254 | list_del(&err->list); |
7255 | ||
7256 | return err; | |
7257 | } | |
7258 | ||
7259 | /** | |
7260 | * err_pos - find the position of a string within a command for error careting | |
7261 | * @cmd: The tracing command that caused the error | |
7262 | * @str: The string to position the caret at within @cmd | |
7263 | * | |
7264 | * Finds the position of the first occurence of @str within @cmd. The | |
7265 | * return value can be passed to tracing_log_err() for caret placement | |
7266 | * within @cmd. | |
7267 | * | |
7268 | * Returns the index within @cmd of the first occurence of @str or 0 | |
7269 | * if @str was not found. | |
7270 | */ | |
7271 | unsigned int err_pos(char *cmd, const char *str) | |
7272 | { | |
7273 | char *found; | |
7274 | ||
7275 | if (WARN_ON(!strlen(cmd))) | |
7276 | return 0; | |
7277 | ||
7278 | found = strstr(cmd, str); | |
7279 | if (found) | |
7280 | return found - cmd; | |
7281 | ||
7282 | return 0; | |
7283 | } | |
7284 | ||
7285 | /** | |
7286 | * tracing_log_err - write an error to the tracing error log | |
2f754e77 | 7287 | * @tr: The associated trace array for the error (NULL for top level array) |
8a062902 TZ |
7288 | * @loc: A string describing where the error occurred |
7289 | * @cmd: The tracing command that caused the error | |
7290 | * @errs: The array of loc-specific static error strings | |
7291 | * @type: The index into errs[], which produces the specific static err string | |
7292 | * @pos: The position the caret should be placed in the cmd | |
7293 | * | |
7294 | * Writes an error into tracing/error_log of the form: | |
7295 | * | |
7296 | * <loc>: error: <text> | |
7297 | * Command: <cmd> | |
7298 | * ^ | |
7299 | * | |
7300 | * tracing/error_log is a small log file containing the last | |
7301 | * TRACING_LOG_ERRS_MAX errors (8). Memory for errors isn't allocated | |
7302 | * unless there has been a tracing error, and the error log can be | |
7303 | * cleared and have its memory freed by writing the empty string in | |
7304 | * truncation mode to it i.e. echo > tracing/error_log. | |
7305 | * | |
7306 | * NOTE: the @errs array along with the @type param are used to | |
7307 | * produce a static error string - this string is not copied and saved | |
7308 | * when the error is logged - only a pointer to it is saved. See | |
7309 | * existing callers for examples of how static strings are typically | |
7310 | * defined for use with tracing_log_err(). | |
7311 | */ | |
2f754e77 SRV |
7312 | void tracing_log_err(struct trace_array *tr, |
7313 | const char *loc, const char *cmd, | |
8a062902 TZ |
7314 | const char **errs, u8 type, u8 pos) |
7315 | { | |
7316 | struct tracing_log_err *err; | |
7317 | ||
2f754e77 SRV |
7318 | if (!tr) |
7319 | tr = &global_trace; | |
7320 | ||
8a062902 | 7321 | mutex_lock(&tracing_err_log_lock); |
2f754e77 | 7322 | err = get_tracing_log_err(tr); |
8a062902 TZ |
7323 | if (PTR_ERR(err) == -ENOMEM) { |
7324 | mutex_unlock(&tracing_err_log_lock); | |
7325 | return; | |
7326 | } | |
7327 | ||
7328 | snprintf(err->loc, TRACING_LOG_LOC_MAX, "%s: error: ", loc); | |
7329 | snprintf(err->cmd, MAX_FILTER_STR_VAL,"\n" CMD_PREFIX "%s\n", cmd); | |
7330 | ||
7331 | err->info.errs = errs; | |
7332 | err->info.type = type; | |
7333 | err->info.pos = pos; | |
7334 | err->info.ts = local_clock(); | |
7335 | ||
2f754e77 | 7336 | list_add_tail(&err->list, &tr->err_log); |
8a062902 TZ |
7337 | mutex_unlock(&tracing_err_log_lock); |
7338 | } | |
7339 | ||
2f754e77 | 7340 | static void clear_tracing_err_log(struct trace_array *tr) |
8a062902 TZ |
7341 | { |
7342 | struct tracing_log_err *err, *next; | |
7343 | ||
7344 | mutex_lock(&tracing_err_log_lock); | |
2f754e77 | 7345 | list_for_each_entry_safe(err, next, &tr->err_log, list) { |
8a062902 TZ |
7346 | list_del(&err->list); |
7347 | kfree(err); | |
7348 | } | |
7349 | ||
2f754e77 | 7350 | tr->n_err_log_entries = 0; |
8a062902 TZ |
7351 | mutex_unlock(&tracing_err_log_lock); |
7352 | } | |
7353 | ||
7354 | static void *tracing_err_log_seq_start(struct seq_file *m, loff_t *pos) | |
7355 | { | |
2f754e77 SRV |
7356 | struct trace_array *tr = m->private; |
7357 | ||
8a062902 TZ |
7358 | mutex_lock(&tracing_err_log_lock); |
7359 | ||
2f754e77 | 7360 | return seq_list_start(&tr->err_log, *pos); |
8a062902 TZ |
7361 | } |
7362 | ||
7363 | static void *tracing_err_log_seq_next(struct seq_file *m, void *v, loff_t *pos) | |
7364 | { | |
2f754e77 SRV |
7365 | struct trace_array *tr = m->private; |
7366 | ||
7367 | return seq_list_next(v, &tr->err_log, pos); | |
8a062902 TZ |
7368 | } |
7369 | ||
7370 | static void tracing_err_log_seq_stop(struct seq_file *m, void *v) | |
7371 | { | |
7372 | mutex_unlock(&tracing_err_log_lock); | |
7373 | } | |
7374 | ||
7375 | static void tracing_err_log_show_pos(struct seq_file *m, u8 pos) | |
7376 | { | |
7377 | u8 i; | |
7378 | ||
7379 | for (i = 0; i < sizeof(CMD_PREFIX) - 1; i++) | |
7380 | seq_putc(m, ' '); | |
7381 | for (i = 0; i < pos; i++) | |
7382 | seq_putc(m, ' '); | |
7383 | seq_puts(m, "^\n"); | |
7384 | } | |
7385 | ||
7386 | static int tracing_err_log_seq_show(struct seq_file *m, void *v) | |
7387 | { | |
7388 | struct tracing_log_err *err = v; | |
7389 | ||
7390 | if (err) { | |
7391 | const char *err_text = err->info.errs[err->info.type]; | |
7392 | u64 sec = err->info.ts; | |
7393 | u32 nsec; | |
7394 | ||
7395 | nsec = do_div(sec, NSEC_PER_SEC); | |
7396 | seq_printf(m, "[%5llu.%06u] %s%s", sec, nsec / 1000, | |
7397 | err->loc, err_text); | |
7398 | seq_printf(m, "%s", err->cmd); | |
7399 | tracing_err_log_show_pos(m, err->info.pos); | |
7400 | } | |
7401 | ||
7402 | return 0; | |
7403 | } | |
7404 | ||
7405 | static const struct seq_operations tracing_err_log_seq_ops = { | |
7406 | .start = tracing_err_log_seq_start, | |
7407 | .next = tracing_err_log_seq_next, | |
7408 | .stop = tracing_err_log_seq_stop, | |
7409 | .show = tracing_err_log_seq_show | |
7410 | }; | |
7411 | ||
7412 | static int tracing_err_log_open(struct inode *inode, struct file *file) | |
7413 | { | |
2f754e77 | 7414 | struct trace_array *tr = inode->i_private; |
8a062902 TZ |
7415 | int ret = 0; |
7416 | ||
8530dec6 SRV |
7417 | ret = tracing_check_open_get_tr(tr); |
7418 | if (ret) | |
7419 | return ret; | |
2f754e77 | 7420 | |
8a062902 TZ |
7421 | /* If this file was opened for write, then erase contents */ |
7422 | if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) | |
2f754e77 | 7423 | clear_tracing_err_log(tr); |
8a062902 | 7424 | |
2f754e77 | 7425 | if (file->f_mode & FMODE_READ) { |
8a062902 | 7426 | ret = seq_open(file, &tracing_err_log_seq_ops); |
2f754e77 SRV |
7427 | if (!ret) { |
7428 | struct seq_file *m = file->private_data; | |
7429 | m->private = tr; | |
7430 | } else { | |
7431 | trace_array_put(tr); | |
7432 | } | |
7433 | } | |
8a062902 TZ |
7434 | return ret; |
7435 | } | |
7436 | ||
7437 | static ssize_t tracing_err_log_write(struct file *file, | |
7438 | const char __user *buffer, | |
7439 | size_t count, loff_t *ppos) | |
7440 | { | |
7441 | return count; | |
7442 | } | |
7443 | ||
d122ed62 TM |
7444 | static int tracing_err_log_release(struct inode *inode, struct file *file) |
7445 | { | |
7446 | struct trace_array *tr = inode->i_private; | |
7447 | ||
7448 | trace_array_put(tr); | |
7449 | ||
7450 | if (file->f_mode & FMODE_READ) | |
7451 | seq_release(inode, file); | |
7452 | ||
7453 | return 0; | |
7454 | } | |
7455 | ||
8a062902 TZ |
7456 | static const struct file_operations tracing_err_log_fops = { |
7457 | .open = tracing_err_log_open, | |
7458 | .write = tracing_err_log_write, | |
7459 | .read = seq_read, | |
7460 | .llseek = seq_lseek, | |
d122ed62 | 7461 | .release = tracing_err_log_release, |
8a062902 TZ |
7462 | }; |
7463 | ||
2cadf913 SR |
7464 | static int tracing_buffers_open(struct inode *inode, struct file *filp) |
7465 | { | |
46ef2be0 | 7466 | struct trace_array *tr = inode->i_private; |
2cadf913 | 7467 | struct ftrace_buffer_info *info; |
7b85af63 | 7468 | int ret; |
2cadf913 | 7469 | |
8530dec6 SRV |
7470 | ret = tracing_check_open_get_tr(tr); |
7471 | if (ret) | |
7472 | return ret; | |
7b85af63 | 7473 | |
0f69dae4 | 7474 | info = kvzalloc(sizeof(*info), GFP_KERNEL); |
7b85af63 SRRH |
7475 | if (!info) { |
7476 | trace_array_put(tr); | |
2cadf913 | 7477 | return -ENOMEM; |
7b85af63 | 7478 | } |
2cadf913 | 7479 | |
a695cb58 SRRH |
7480 | mutex_lock(&trace_types_lock); |
7481 | ||
cc60cdc9 | 7482 | info->iter.tr = tr; |
46ef2be0 | 7483 | info->iter.cpu_file = tracing_get_cpu(inode); |
b627344f | 7484 | info->iter.trace = tr->current_trace; |
1c5eb448 | 7485 | info->iter.array_buffer = &tr->array_buffer; |
cc60cdc9 | 7486 | info->spare = NULL; |
2cadf913 | 7487 | /* Force reading ring buffer for first read */ |
cc60cdc9 | 7488 | info->read = (unsigned int)-1; |
2cadf913 SR |
7489 | |
7490 | filp->private_data = info; | |
7491 | ||
7ef282e0 | 7492 | tr->trace_ref++; |
cf6ab6d9 | 7493 | |
a695cb58 SRRH |
7494 | mutex_unlock(&trace_types_lock); |
7495 | ||
7b85af63 SRRH |
7496 | ret = nonseekable_open(inode, filp); |
7497 | if (ret < 0) | |
7498 | trace_array_put(tr); | |
7499 | ||
7500 | return ret; | |
2cadf913 SR |
7501 | } |
7502 | ||
9dd95748 | 7503 | static __poll_t |
cc60cdc9 SR |
7504 | tracing_buffers_poll(struct file *filp, poll_table *poll_table) |
7505 | { | |
7506 | struct ftrace_buffer_info *info = filp->private_data; | |
7507 | struct trace_iterator *iter = &info->iter; | |
7508 | ||
7509 | return trace_poll(iter, filp, poll_table); | |
7510 | } | |
7511 | ||
2cadf913 SR |
7512 | static ssize_t |
7513 | tracing_buffers_read(struct file *filp, char __user *ubuf, | |
7514 | size_t count, loff_t *ppos) | |
7515 | { | |
7516 | struct ftrace_buffer_info *info = filp->private_data; | |
cc60cdc9 | 7517 | struct trace_iterator *iter = &info->iter; |
a7e52ad7 | 7518 | ssize_t ret = 0; |
6de58e62 | 7519 | ssize_t size; |
2cadf913 | 7520 | |
2dc5d12b SR |
7521 | if (!count) |
7522 | return 0; | |
7523 | ||
6de58e62 | 7524 | #ifdef CONFIG_TRACER_MAX_TRACE |
d716ff71 SRRH |
7525 | if (iter->snapshot && iter->tr->current_trace->use_max_tr) |
7526 | return -EBUSY; | |
6de58e62 SRRH |
7527 | #endif |
7528 | ||
73a757e6 | 7529 | if (!info->spare) { |
1c5eb448 | 7530 | info->spare = ring_buffer_alloc_read_page(iter->array_buffer->buffer, |
12883efb | 7531 | iter->cpu_file); |
a7e52ad7 SRV |
7532 | if (IS_ERR(info->spare)) { |
7533 | ret = PTR_ERR(info->spare); | |
7534 | info->spare = NULL; | |
7535 | } else { | |
7536 | info->spare_cpu = iter->cpu_file; | |
7537 | } | |
73a757e6 | 7538 | } |
ddd538f3 | 7539 | if (!info->spare) |
a7e52ad7 | 7540 | return ret; |
ddd538f3 | 7541 | |
2cadf913 SR |
7542 | /* Do we have previous read data to read? */ |
7543 | if (info->read < PAGE_SIZE) | |
7544 | goto read; | |
7545 | ||
b627344f | 7546 | again: |
cc60cdc9 | 7547 | trace_access_lock(iter->cpu_file); |
1c5eb448 | 7548 | ret = ring_buffer_read_page(iter->array_buffer->buffer, |
2cadf913 SR |
7549 | &info->spare, |
7550 | count, | |
cc60cdc9 SR |
7551 | iter->cpu_file, 0); |
7552 | trace_access_unlock(iter->cpu_file); | |
2cadf913 | 7553 | |
b627344f SR |
7554 | if (ret < 0) { |
7555 | if (trace_empty(iter)) { | |
d716ff71 SRRH |
7556 | if ((filp->f_flags & O_NONBLOCK)) |
7557 | return -EAGAIN; | |
7558 | ||
2c2b0a78 | 7559 | ret = wait_on_pipe(iter, 0); |
d716ff71 SRRH |
7560 | if (ret) |
7561 | return ret; | |
7562 | ||
b627344f SR |
7563 | goto again; |
7564 | } | |
d716ff71 | 7565 | return 0; |
b627344f | 7566 | } |
436fc280 | 7567 | |
436fc280 | 7568 | info->read = 0; |
b627344f | 7569 | read: |
2cadf913 SR |
7570 | size = PAGE_SIZE - info->read; |
7571 | if (size > count) | |
7572 | size = count; | |
7573 | ||
7574 | ret = copy_to_user(ubuf, info->spare + info->read, size); | |
d716ff71 SRRH |
7575 | if (ret == size) |
7576 | return -EFAULT; | |
7577 | ||
2dc5d12b SR |
7578 | size -= ret; |
7579 | ||
2cadf913 SR |
7580 | *ppos += size; |
7581 | info->read += size; | |
7582 | ||
7583 | return size; | |
7584 | } | |
7585 | ||
7586 | static int tracing_buffers_release(struct inode *inode, struct file *file) | |
7587 | { | |
7588 | struct ftrace_buffer_info *info = file->private_data; | |
cc60cdc9 | 7589 | struct trace_iterator *iter = &info->iter; |
2cadf913 | 7590 | |
a695cb58 SRRH |
7591 | mutex_lock(&trace_types_lock); |
7592 | ||
7ef282e0 | 7593 | iter->tr->trace_ref--; |
cf6ab6d9 | 7594 | |
ff451961 | 7595 | __trace_array_put(iter->tr); |
2cadf913 | 7596 | |
ddd538f3 | 7597 | if (info->spare) |
1c5eb448 | 7598 | ring_buffer_free_read_page(iter->array_buffer->buffer, |
73a757e6 | 7599 | info->spare_cpu, info->spare); |
0f69dae4 | 7600 | kvfree(info); |
2cadf913 | 7601 | |
a695cb58 SRRH |
7602 | mutex_unlock(&trace_types_lock); |
7603 | ||
2cadf913 SR |
7604 | return 0; |
7605 | } | |
7606 | ||
7607 | struct buffer_ref { | |
13292494 | 7608 | struct trace_buffer *buffer; |
2cadf913 | 7609 | void *page; |
73a757e6 | 7610 | int cpu; |
b9872226 | 7611 | refcount_t refcount; |
2cadf913 SR |
7612 | }; |
7613 | ||
b9872226 JH |
7614 | static void buffer_ref_release(struct buffer_ref *ref) |
7615 | { | |
7616 | if (!refcount_dec_and_test(&ref->refcount)) | |
7617 | return; | |
7618 | ring_buffer_free_read_page(ref->buffer, ref->cpu, ref->page); | |
7619 | kfree(ref); | |
7620 | } | |
7621 | ||
2cadf913 SR |
7622 | static void buffer_pipe_buf_release(struct pipe_inode_info *pipe, |
7623 | struct pipe_buffer *buf) | |
7624 | { | |
7625 | struct buffer_ref *ref = (struct buffer_ref *)buf->private; | |
7626 | ||
b9872226 | 7627 | buffer_ref_release(ref); |
2cadf913 SR |
7628 | buf->private = 0; |
7629 | } | |
7630 | ||
15fab63e | 7631 | static bool buffer_pipe_buf_get(struct pipe_inode_info *pipe, |
2cadf913 SR |
7632 | struct pipe_buffer *buf) |
7633 | { | |
7634 | struct buffer_ref *ref = (struct buffer_ref *)buf->private; | |
7635 | ||
e9e1a2e7 | 7636 | if (refcount_read(&ref->refcount) > INT_MAX/2) |
15fab63e MW |
7637 | return false; |
7638 | ||
b9872226 | 7639 | refcount_inc(&ref->refcount); |
15fab63e | 7640 | return true; |
2cadf913 SR |
7641 | } |
7642 | ||
7643 | /* Pipe buffer operations for a buffer. */ | |
28dfef8f | 7644 | static const struct pipe_buf_operations buffer_pipe_buf_ops = { |
2cadf913 | 7645 | .release = buffer_pipe_buf_release, |
2cadf913 SR |
7646 | .get = buffer_pipe_buf_get, |
7647 | }; | |
7648 | ||
7649 | /* | |
7650 | * Callback from splice_to_pipe(), if we need to release some pages | |
7651 | * at the end of the spd in case we error'ed out in filling the pipe. | |
7652 | */ | |
7653 | static void buffer_spd_release(struct splice_pipe_desc *spd, unsigned int i) | |
7654 | { | |
7655 | struct buffer_ref *ref = | |
7656 | (struct buffer_ref *)spd->partial[i].private; | |
7657 | ||
b9872226 | 7658 | buffer_ref_release(ref); |
2cadf913 SR |
7659 | spd->partial[i].private = 0; |
7660 | } | |
7661 | ||
7662 | static ssize_t | |
7663 | tracing_buffers_splice_read(struct file *file, loff_t *ppos, | |
7664 | struct pipe_inode_info *pipe, size_t len, | |
7665 | unsigned int flags) | |
7666 | { | |
7667 | struct ftrace_buffer_info *info = file->private_data; | |
cc60cdc9 | 7668 | struct trace_iterator *iter = &info->iter; |
35f3d14d JA |
7669 | struct partial_page partial_def[PIPE_DEF_BUFFERS]; |
7670 | struct page *pages_def[PIPE_DEF_BUFFERS]; | |
2cadf913 | 7671 | struct splice_pipe_desc spd = { |
35f3d14d JA |
7672 | .pages = pages_def, |
7673 | .partial = partial_def, | |
047fe360 | 7674 | .nr_pages_max = PIPE_DEF_BUFFERS, |
2cadf913 SR |
7675 | .ops = &buffer_pipe_buf_ops, |
7676 | .spd_release = buffer_spd_release, | |
7677 | }; | |
7678 | struct buffer_ref *ref; | |
6b7e633f | 7679 | int entries, i; |
07906da7 | 7680 | ssize_t ret = 0; |
2cadf913 | 7681 | |
6de58e62 | 7682 | #ifdef CONFIG_TRACER_MAX_TRACE |
d716ff71 SRRH |
7683 | if (iter->snapshot && iter->tr->current_trace->use_max_tr) |
7684 | return -EBUSY; | |
6de58e62 SRRH |
7685 | #endif |
7686 | ||
d716ff71 SRRH |
7687 | if (*ppos & (PAGE_SIZE - 1)) |
7688 | return -EINVAL; | |
93cfb3c9 LJ |
7689 | |
7690 | if (len & (PAGE_SIZE - 1)) { | |
d716ff71 SRRH |
7691 | if (len < PAGE_SIZE) |
7692 | return -EINVAL; | |
93cfb3c9 LJ |
7693 | len &= PAGE_MASK; |
7694 | } | |
7695 | ||
1ae2293d AV |
7696 | if (splice_grow_spd(pipe, &spd)) |
7697 | return -ENOMEM; | |
7698 | ||
cc60cdc9 SR |
7699 | again: |
7700 | trace_access_lock(iter->cpu_file); | |
1c5eb448 | 7701 | entries = ring_buffer_entries_cpu(iter->array_buffer->buffer, iter->cpu_file); |
93459c6c | 7702 | |
a786c06d | 7703 | for (i = 0; i < spd.nr_pages_max && len && entries; i++, len -= PAGE_SIZE) { |
2cadf913 SR |
7704 | struct page *page; |
7705 | int r; | |
7706 | ||
7707 | ref = kzalloc(sizeof(*ref), GFP_KERNEL); | |
07906da7 RV |
7708 | if (!ref) { |
7709 | ret = -ENOMEM; | |
2cadf913 | 7710 | break; |
07906da7 | 7711 | } |
2cadf913 | 7712 | |
b9872226 | 7713 | refcount_set(&ref->refcount, 1); |
1c5eb448 | 7714 | ref->buffer = iter->array_buffer->buffer; |
cc60cdc9 | 7715 | ref->page = ring_buffer_alloc_read_page(ref->buffer, iter->cpu_file); |
a7e52ad7 SRV |
7716 | if (IS_ERR(ref->page)) { |
7717 | ret = PTR_ERR(ref->page); | |
7718 | ref->page = NULL; | |
2cadf913 SR |
7719 | kfree(ref); |
7720 | break; | |
7721 | } | |
73a757e6 | 7722 | ref->cpu = iter->cpu_file; |
2cadf913 SR |
7723 | |
7724 | r = ring_buffer_read_page(ref->buffer, &ref->page, | |
cc60cdc9 | 7725 | len, iter->cpu_file, 1); |
2cadf913 | 7726 | if (r < 0) { |
73a757e6 SRV |
7727 | ring_buffer_free_read_page(ref->buffer, ref->cpu, |
7728 | ref->page); | |
2cadf913 SR |
7729 | kfree(ref); |
7730 | break; | |
7731 | } | |
7732 | ||
2cadf913 SR |
7733 | page = virt_to_page(ref->page); |
7734 | ||
7735 | spd.pages[i] = page; | |
7736 | spd.partial[i].len = PAGE_SIZE; | |
7737 | spd.partial[i].offset = 0; | |
7738 | spd.partial[i].private = (unsigned long)ref; | |
7739 | spd.nr_pages++; | |
93cfb3c9 | 7740 | *ppos += PAGE_SIZE; |
93459c6c | 7741 | |
1c5eb448 | 7742 | entries = ring_buffer_entries_cpu(iter->array_buffer->buffer, iter->cpu_file); |
2cadf913 SR |
7743 | } |
7744 | ||
cc60cdc9 | 7745 | trace_access_unlock(iter->cpu_file); |
2cadf913 SR |
7746 | spd.nr_pages = i; |
7747 | ||
7748 | /* did we read anything? */ | |
7749 | if (!spd.nr_pages) { | |
07906da7 | 7750 | if (ret) |
1ae2293d | 7751 | goto out; |
d716ff71 | 7752 | |
1ae2293d | 7753 | ret = -EAGAIN; |
d716ff71 | 7754 | if ((file->f_flags & O_NONBLOCK) || (flags & SPLICE_F_NONBLOCK)) |
1ae2293d | 7755 | goto out; |
07906da7 | 7756 | |
03329f99 | 7757 | ret = wait_on_pipe(iter, iter->tr->buffer_percent); |
8b8b3683 | 7758 | if (ret) |
1ae2293d | 7759 | goto out; |
e30f53aa | 7760 | |
cc60cdc9 | 7761 | goto again; |
2cadf913 SR |
7762 | } |
7763 | ||
7764 | ret = splice_to_pipe(pipe, &spd); | |
1ae2293d | 7765 | out: |
047fe360 | 7766 | splice_shrink_spd(&spd); |
6de58e62 | 7767 | |
2cadf913 SR |
7768 | return ret; |
7769 | } | |
7770 | ||
7771 | static const struct file_operations tracing_buffers_fops = { | |
7772 | .open = tracing_buffers_open, | |
7773 | .read = tracing_buffers_read, | |
cc60cdc9 | 7774 | .poll = tracing_buffers_poll, |
2cadf913 SR |
7775 | .release = tracing_buffers_release, |
7776 | .splice_read = tracing_buffers_splice_read, | |
7777 | .llseek = no_llseek, | |
7778 | }; | |
7779 | ||
c8d77183 SR |
7780 | static ssize_t |
7781 | tracing_stats_read(struct file *filp, char __user *ubuf, | |
7782 | size_t count, loff_t *ppos) | |
7783 | { | |
4d3435b8 ON |
7784 | struct inode *inode = file_inode(filp); |
7785 | struct trace_array *tr = inode->i_private; | |
1c5eb448 | 7786 | struct array_buffer *trace_buf = &tr->array_buffer; |
4d3435b8 | 7787 | int cpu = tracing_get_cpu(inode); |
c8d77183 SR |
7788 | struct trace_seq *s; |
7789 | unsigned long cnt; | |
c64e148a VN |
7790 | unsigned long long t; |
7791 | unsigned long usec_rem; | |
c8d77183 | 7792 | |
e4f2d10f | 7793 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
c8d77183 | 7794 | if (!s) |
a646365c | 7795 | return -ENOMEM; |
c8d77183 SR |
7796 | |
7797 | trace_seq_init(s); | |
7798 | ||
12883efb | 7799 | cnt = ring_buffer_entries_cpu(trace_buf->buffer, cpu); |
c8d77183 SR |
7800 | trace_seq_printf(s, "entries: %ld\n", cnt); |
7801 | ||
12883efb | 7802 | cnt = ring_buffer_overrun_cpu(trace_buf->buffer, cpu); |
c8d77183 SR |
7803 | trace_seq_printf(s, "overrun: %ld\n", cnt); |
7804 | ||
12883efb | 7805 | cnt = ring_buffer_commit_overrun_cpu(trace_buf->buffer, cpu); |
c8d77183 SR |
7806 | trace_seq_printf(s, "commit overrun: %ld\n", cnt); |
7807 | ||
12883efb | 7808 | cnt = ring_buffer_bytes_cpu(trace_buf->buffer, cpu); |
c64e148a VN |
7809 | trace_seq_printf(s, "bytes: %ld\n", cnt); |
7810 | ||
58e8eedf | 7811 | if (trace_clocks[tr->clock_id].in_ns) { |
11043d8b | 7812 | /* local or global for trace_clock */ |
12883efb | 7813 | t = ns2usecs(ring_buffer_oldest_event_ts(trace_buf->buffer, cpu)); |
11043d8b YY |
7814 | usec_rem = do_div(t, USEC_PER_SEC); |
7815 | trace_seq_printf(s, "oldest event ts: %5llu.%06lu\n", | |
7816 | t, usec_rem); | |
7817 | ||
12883efb | 7818 | t = ns2usecs(ring_buffer_time_stamp(trace_buf->buffer, cpu)); |
11043d8b YY |
7819 | usec_rem = do_div(t, USEC_PER_SEC); |
7820 | trace_seq_printf(s, "now ts: %5llu.%06lu\n", t, usec_rem); | |
7821 | } else { | |
7822 | /* counter or tsc mode for trace_clock */ | |
7823 | trace_seq_printf(s, "oldest event ts: %llu\n", | |
12883efb | 7824 | ring_buffer_oldest_event_ts(trace_buf->buffer, cpu)); |
c64e148a | 7825 | |
11043d8b | 7826 | trace_seq_printf(s, "now ts: %llu\n", |
12883efb | 7827 | ring_buffer_time_stamp(trace_buf->buffer, cpu)); |
11043d8b | 7828 | } |
c64e148a | 7829 | |
12883efb | 7830 | cnt = ring_buffer_dropped_events_cpu(trace_buf->buffer, cpu); |
884bfe89 SP |
7831 | trace_seq_printf(s, "dropped events: %ld\n", cnt); |
7832 | ||
12883efb | 7833 | cnt = ring_buffer_read_events_cpu(trace_buf->buffer, cpu); |
ad964704 SRRH |
7834 | trace_seq_printf(s, "read events: %ld\n", cnt); |
7835 | ||
5ac48378 SRRH |
7836 | count = simple_read_from_buffer(ubuf, count, ppos, |
7837 | s->buffer, trace_seq_used(s)); | |
c8d77183 SR |
7838 | |
7839 | kfree(s); | |
7840 | ||
7841 | return count; | |
7842 | } | |
7843 | ||
7844 | static const struct file_operations tracing_stats_fops = { | |
4d3435b8 | 7845 | .open = tracing_open_generic_tr, |
c8d77183 | 7846 | .read = tracing_stats_read, |
b444786f | 7847 | .llseek = generic_file_llseek, |
4d3435b8 | 7848 | .release = tracing_release_generic_tr, |
c8d77183 SR |
7849 | }; |
7850 | ||
bc0c38d1 SR |
7851 | #ifdef CONFIG_DYNAMIC_FTRACE |
7852 | ||
7853 | static ssize_t | |
b807c3d0 | 7854 | tracing_read_dyn_info(struct file *filp, char __user *ubuf, |
bc0c38d1 SR |
7855 | size_t cnt, loff_t *ppos) |
7856 | { | |
da537f0a SRV |
7857 | ssize_t ret; |
7858 | char *buf; | |
bc0c38d1 SR |
7859 | int r; |
7860 | ||
da537f0a SRV |
7861 | /* 256 should be plenty to hold the amount needed */ |
7862 | buf = kmalloc(256, GFP_KERNEL); | |
7863 | if (!buf) | |
7864 | return -ENOMEM; | |
b807c3d0 | 7865 | |
da537f0a SRV |
7866 | r = scnprintf(buf, 256, "%ld pages:%ld groups: %ld\n", |
7867 | ftrace_update_tot_cnt, | |
7868 | ftrace_number_of_pages, | |
7869 | ftrace_number_of_groups); | |
7870 | ||
7871 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
7872 | kfree(buf); | |
7873 | return ret; | |
bc0c38d1 SR |
7874 | } |
7875 | ||
5e2336a0 | 7876 | static const struct file_operations tracing_dyn_info_fops = { |
4bf39a94 | 7877 | .open = tracing_open_generic, |
b807c3d0 | 7878 | .read = tracing_read_dyn_info, |
b444786f | 7879 | .llseek = generic_file_llseek, |
bc0c38d1 | 7880 | }; |
77fd5c15 | 7881 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
bc0c38d1 | 7882 | |
77fd5c15 SRRH |
7883 | #if defined(CONFIG_TRACER_SNAPSHOT) && defined(CONFIG_DYNAMIC_FTRACE) |
7884 | static void | |
bca6c8d0 | 7885 | ftrace_snapshot(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 7886 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 7887 | void *data) |
77fd5c15 | 7888 | { |
cab50379 | 7889 | tracing_snapshot_instance(tr); |
77fd5c15 | 7890 | } |
bc0c38d1 | 7891 | |
77fd5c15 | 7892 | static void |
bca6c8d0 | 7893 | ftrace_count_snapshot(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 7894 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 7895 | void *data) |
bc0c38d1 | 7896 | { |
6e444319 | 7897 | struct ftrace_func_mapper *mapper = data; |
1a93f8bd | 7898 | long *count = NULL; |
77fd5c15 | 7899 | |
1a93f8bd SRV |
7900 | if (mapper) |
7901 | count = (long *)ftrace_func_mapper_find_ip(mapper, ip); | |
7902 | ||
7903 | if (count) { | |
7904 | ||
7905 | if (*count <= 0) | |
7906 | return; | |
bc0c38d1 | 7907 | |
77fd5c15 | 7908 | (*count)--; |
1a93f8bd | 7909 | } |
77fd5c15 | 7910 | |
cab50379 | 7911 | tracing_snapshot_instance(tr); |
77fd5c15 SRRH |
7912 | } |
7913 | ||
7914 | static int | |
7915 | ftrace_snapshot_print(struct seq_file *m, unsigned long ip, | |
7916 | struct ftrace_probe_ops *ops, void *data) | |
7917 | { | |
6e444319 | 7918 | struct ftrace_func_mapper *mapper = data; |
1a93f8bd | 7919 | long *count = NULL; |
77fd5c15 SRRH |
7920 | |
7921 | seq_printf(m, "%ps:", (void *)ip); | |
7922 | ||
fa6f0cc7 | 7923 | seq_puts(m, "snapshot"); |
77fd5c15 | 7924 | |
1a93f8bd SRV |
7925 | if (mapper) |
7926 | count = (long *)ftrace_func_mapper_find_ip(mapper, ip); | |
7927 | ||
7928 | if (count) | |
7929 | seq_printf(m, ":count=%ld\n", *count); | |
77fd5c15 | 7930 | else |
1a93f8bd | 7931 | seq_puts(m, ":unlimited\n"); |
77fd5c15 SRRH |
7932 | |
7933 | return 0; | |
7934 | } | |
7935 | ||
1a93f8bd | 7936 | static int |
b5f081b5 | 7937 | ftrace_snapshot_init(struct ftrace_probe_ops *ops, struct trace_array *tr, |
6e444319 | 7938 | unsigned long ip, void *init_data, void **data) |
1a93f8bd | 7939 | { |
6e444319 SRV |
7940 | struct ftrace_func_mapper *mapper = *data; |
7941 | ||
7942 | if (!mapper) { | |
7943 | mapper = allocate_ftrace_func_mapper(); | |
7944 | if (!mapper) | |
7945 | return -ENOMEM; | |
7946 | *data = mapper; | |
7947 | } | |
1a93f8bd | 7948 | |
6e444319 | 7949 | return ftrace_func_mapper_add_ip(mapper, ip, init_data); |
1a93f8bd SRV |
7950 | } |
7951 | ||
7952 | static void | |
b5f081b5 | 7953 | ftrace_snapshot_free(struct ftrace_probe_ops *ops, struct trace_array *tr, |
6e444319 | 7954 | unsigned long ip, void *data) |
1a93f8bd | 7955 | { |
6e444319 SRV |
7956 | struct ftrace_func_mapper *mapper = data; |
7957 | ||
7958 | if (!ip) { | |
7959 | if (!mapper) | |
7960 | return; | |
7961 | free_ftrace_func_mapper(mapper, NULL); | |
7962 | return; | |
7963 | } | |
1a93f8bd SRV |
7964 | |
7965 | ftrace_func_mapper_remove_ip(mapper, ip); | |
7966 | } | |
7967 | ||
77fd5c15 SRRH |
7968 | static struct ftrace_probe_ops snapshot_probe_ops = { |
7969 | .func = ftrace_snapshot, | |
7970 | .print = ftrace_snapshot_print, | |
7971 | }; | |
7972 | ||
7973 | static struct ftrace_probe_ops snapshot_count_probe_ops = { | |
7974 | .func = ftrace_count_snapshot, | |
7975 | .print = ftrace_snapshot_print, | |
1a93f8bd SRV |
7976 | .init = ftrace_snapshot_init, |
7977 | .free = ftrace_snapshot_free, | |
77fd5c15 SRRH |
7978 | }; |
7979 | ||
7980 | static int | |
04ec7bb6 | 7981 | ftrace_trace_snapshot_callback(struct trace_array *tr, struct ftrace_hash *hash, |
77fd5c15 SRRH |
7982 | char *glob, char *cmd, char *param, int enable) |
7983 | { | |
7984 | struct ftrace_probe_ops *ops; | |
7985 | void *count = (void *)-1; | |
7986 | char *number; | |
7987 | int ret; | |
7988 | ||
0f179765 SRV |
7989 | if (!tr) |
7990 | return -ENODEV; | |
7991 | ||
77fd5c15 SRRH |
7992 | /* hash funcs only work with set_ftrace_filter */ |
7993 | if (!enable) | |
7994 | return -EINVAL; | |
7995 | ||
7996 | ops = param ? &snapshot_count_probe_ops : &snapshot_probe_ops; | |
7997 | ||
d3d532d7 | 7998 | if (glob[0] == '!') |
7b60f3d8 | 7999 | return unregister_ftrace_function_probe_func(glob+1, tr, ops); |
77fd5c15 SRRH |
8000 | |
8001 | if (!param) | |
8002 | goto out_reg; | |
8003 | ||
8004 | number = strsep(¶m, ":"); | |
8005 | ||
8006 | if (!strlen(number)) | |
8007 | goto out_reg; | |
8008 | ||
8009 | /* | |
8010 | * We use the callback data field (which is a pointer) | |
8011 | * as our counter. | |
8012 | */ | |
8013 | ret = kstrtoul(number, 0, (unsigned long *)&count); | |
8014 | if (ret) | |
8015 | return ret; | |
8016 | ||
8017 | out_reg: | |
2824f503 | 8018 | ret = tracing_alloc_snapshot_instance(tr); |
df62db5b SRV |
8019 | if (ret < 0) |
8020 | goto out; | |
77fd5c15 | 8021 | |
4c174688 | 8022 | ret = register_ftrace_function_probe(glob, tr, ops, count); |
77fd5c15 | 8023 | |
df62db5b | 8024 | out: |
77fd5c15 SRRH |
8025 | return ret < 0 ? ret : 0; |
8026 | } | |
8027 | ||
8028 | static struct ftrace_func_command ftrace_snapshot_cmd = { | |
8029 | .name = "snapshot", | |
8030 | .func = ftrace_trace_snapshot_callback, | |
8031 | }; | |
8032 | ||
38de93ab | 8033 | static __init int register_snapshot_cmd(void) |
77fd5c15 SRRH |
8034 | { |
8035 | return register_ftrace_command(&ftrace_snapshot_cmd); | |
8036 | } | |
8037 | #else | |
38de93ab | 8038 | static inline __init int register_snapshot_cmd(void) { return 0; } |
77fd5c15 | 8039 | #endif /* defined(CONFIG_TRACER_SNAPSHOT) && defined(CONFIG_DYNAMIC_FTRACE) */ |
bc0c38d1 | 8040 | |
7eeafbca | 8041 | static struct dentry *tracing_get_dentry(struct trace_array *tr) |
bc0c38d1 | 8042 | { |
8434dc93 SRRH |
8043 | if (WARN_ON(!tr->dir)) |
8044 | return ERR_PTR(-ENODEV); | |
8045 | ||
8046 | /* Top directory uses NULL as the parent */ | |
8047 | if (tr->flags & TRACE_ARRAY_FL_GLOBAL) | |
8048 | return NULL; | |
8049 | ||
8050 | /* All sub buffers have a descriptor */ | |
2b6080f2 | 8051 | return tr->dir; |
bc0c38d1 SR |
8052 | } |
8053 | ||
2b6080f2 | 8054 | static struct dentry *tracing_dentry_percpu(struct trace_array *tr, int cpu) |
b04cc6b1 | 8055 | { |
b04cc6b1 FW |
8056 | struct dentry *d_tracer; |
8057 | ||
2b6080f2 SR |
8058 | if (tr->percpu_dir) |
8059 | return tr->percpu_dir; | |
b04cc6b1 | 8060 | |
7eeafbca | 8061 | d_tracer = tracing_get_dentry(tr); |
14a5ae40 | 8062 | if (IS_ERR(d_tracer)) |
b04cc6b1 FW |
8063 | return NULL; |
8064 | ||
8434dc93 | 8065 | tr->percpu_dir = tracefs_create_dir("per_cpu", d_tracer); |
b04cc6b1 | 8066 | |
24589e3a | 8067 | MEM_FAIL(!tr->percpu_dir, |
8434dc93 | 8068 | "Could not create tracefs directory 'per_cpu/%d'\n", cpu); |
b04cc6b1 | 8069 | |
2b6080f2 | 8070 | return tr->percpu_dir; |
b04cc6b1 FW |
8071 | } |
8072 | ||
649e9c70 ON |
8073 | static struct dentry * |
8074 | trace_create_cpu_file(const char *name, umode_t mode, struct dentry *parent, | |
8075 | void *data, long cpu, const struct file_operations *fops) | |
8076 | { | |
8077 | struct dentry *ret = trace_create_file(name, mode, parent, data, fops); | |
8078 | ||
8079 | if (ret) /* See tracing_get_cpu() */ | |
7682c918 | 8080 | d_inode(ret)->i_cdev = (void *)(cpu + 1); |
649e9c70 ON |
8081 | return ret; |
8082 | } | |
8083 | ||
2b6080f2 | 8084 | static void |
8434dc93 | 8085 | tracing_init_tracefs_percpu(struct trace_array *tr, long cpu) |
b04cc6b1 | 8086 | { |
2b6080f2 | 8087 | struct dentry *d_percpu = tracing_dentry_percpu(tr, cpu); |
5452af66 | 8088 | struct dentry *d_cpu; |
dd49a38c | 8089 | char cpu_dir[30]; /* 30 characters should be more than enough */ |
b04cc6b1 | 8090 | |
0a3d7ce7 NK |
8091 | if (!d_percpu) |
8092 | return; | |
8093 | ||
dd49a38c | 8094 | snprintf(cpu_dir, 30, "cpu%ld", cpu); |
8434dc93 | 8095 | d_cpu = tracefs_create_dir(cpu_dir, d_percpu); |
8656e7a2 | 8096 | if (!d_cpu) { |
a395d6a7 | 8097 | pr_warn("Could not create tracefs '%s' entry\n", cpu_dir); |
8656e7a2 FW |
8098 | return; |
8099 | } | |
b04cc6b1 | 8100 | |
8656e7a2 | 8101 | /* per cpu trace_pipe */ |
649e9c70 | 8102 | trace_create_cpu_file("trace_pipe", 0444, d_cpu, |
15544209 | 8103 | tr, cpu, &tracing_pipe_fops); |
b04cc6b1 FW |
8104 | |
8105 | /* per cpu trace */ | |
649e9c70 | 8106 | trace_create_cpu_file("trace", 0644, d_cpu, |
6484c71c | 8107 | tr, cpu, &tracing_fops); |
7f96f93f | 8108 | |
649e9c70 | 8109 | trace_create_cpu_file("trace_pipe_raw", 0444, d_cpu, |
46ef2be0 | 8110 | tr, cpu, &tracing_buffers_fops); |
7f96f93f | 8111 | |
649e9c70 | 8112 | trace_create_cpu_file("stats", 0444, d_cpu, |
4d3435b8 | 8113 | tr, cpu, &tracing_stats_fops); |
438ced17 | 8114 | |
649e9c70 | 8115 | trace_create_cpu_file("buffer_size_kb", 0444, d_cpu, |
0bc392ee | 8116 | tr, cpu, &tracing_entries_fops); |
f1affcaa SRRH |
8117 | |
8118 | #ifdef CONFIG_TRACER_SNAPSHOT | |
649e9c70 | 8119 | trace_create_cpu_file("snapshot", 0644, d_cpu, |
6484c71c | 8120 | tr, cpu, &snapshot_fops); |
6de58e62 | 8121 | |
649e9c70 | 8122 | trace_create_cpu_file("snapshot_raw", 0444, d_cpu, |
46ef2be0 | 8123 | tr, cpu, &snapshot_raw_fops); |
f1affcaa | 8124 | #endif |
b04cc6b1 FW |
8125 | } |
8126 | ||
60a11774 SR |
8127 | #ifdef CONFIG_FTRACE_SELFTEST |
8128 | /* Let selftest have access to static functions in this file */ | |
8129 | #include "trace_selftest.c" | |
8130 | #endif | |
8131 | ||
577b785f SR |
8132 | static ssize_t |
8133 | trace_options_read(struct file *filp, char __user *ubuf, size_t cnt, | |
8134 | loff_t *ppos) | |
8135 | { | |
8136 | struct trace_option_dentry *topt = filp->private_data; | |
8137 | char *buf; | |
8138 | ||
8139 | if (topt->flags->val & topt->opt->bit) | |
8140 | buf = "1\n"; | |
8141 | else | |
8142 | buf = "0\n"; | |
8143 | ||
8144 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
8145 | } | |
8146 | ||
8147 | static ssize_t | |
8148 | trace_options_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
8149 | loff_t *ppos) | |
8150 | { | |
8151 | struct trace_option_dentry *topt = filp->private_data; | |
8152 | unsigned long val; | |
577b785f SR |
8153 | int ret; |
8154 | ||
22fe9b54 PH |
8155 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
8156 | if (ret) | |
577b785f SR |
8157 | return ret; |
8158 | ||
8d18eaaf LZ |
8159 | if (val != 0 && val != 1) |
8160 | return -EINVAL; | |
577b785f | 8161 | |
8d18eaaf | 8162 | if (!!(topt->flags->val & topt->opt->bit) != val) { |
577b785f | 8163 | mutex_lock(&trace_types_lock); |
8c1a49ae | 8164 | ret = __set_tracer_option(topt->tr, topt->flags, |
c757bea9 | 8165 | topt->opt, !val); |
577b785f SR |
8166 | mutex_unlock(&trace_types_lock); |
8167 | if (ret) | |
8168 | return ret; | |
577b785f SR |
8169 | } |
8170 | ||
8171 | *ppos += cnt; | |
8172 | ||
8173 | return cnt; | |
8174 | } | |
8175 | ||
8176 | ||
8177 | static const struct file_operations trace_options_fops = { | |
8178 | .open = tracing_open_generic, | |
8179 | .read = trace_options_read, | |
8180 | .write = trace_options_write, | |
b444786f | 8181 | .llseek = generic_file_llseek, |
577b785f SR |
8182 | }; |
8183 | ||
9a38a885 SRRH |
8184 | /* |
8185 | * In order to pass in both the trace_array descriptor as well as the index | |
8186 | * to the flag that the trace option file represents, the trace_array | |
8187 | * has a character array of trace_flags_index[], which holds the index | |
8188 | * of the bit for the flag it represents. index[0] == 0, index[1] == 1, etc. | |
8189 | * The address of this character array is passed to the flag option file | |
8190 | * read/write callbacks. | |
8191 | * | |
8192 | * In order to extract both the index and the trace_array descriptor, | |
8193 | * get_tr_index() uses the following algorithm. | |
8194 | * | |
8195 | * idx = *ptr; | |
8196 | * | |
8197 | * As the pointer itself contains the address of the index (remember | |
8198 | * index[1] == 1). | |
8199 | * | |
8200 | * Then to get the trace_array descriptor, by subtracting that index | |
8201 | * from the ptr, we get to the start of the index itself. | |
8202 | * | |
8203 | * ptr - idx == &index[0] | |
8204 | * | |
8205 | * Then a simple container_of() from that pointer gets us to the | |
8206 | * trace_array descriptor. | |
8207 | */ | |
8208 | static void get_tr_index(void *data, struct trace_array **ptr, | |
8209 | unsigned int *pindex) | |
8210 | { | |
8211 | *pindex = *(unsigned char *)data; | |
8212 | ||
8213 | *ptr = container_of(data - *pindex, struct trace_array, | |
8214 | trace_flags_index); | |
8215 | } | |
8216 | ||
a8259075 SR |
8217 | static ssize_t |
8218 | trace_options_core_read(struct file *filp, char __user *ubuf, size_t cnt, | |
8219 | loff_t *ppos) | |
8220 | { | |
9a38a885 SRRH |
8221 | void *tr_index = filp->private_data; |
8222 | struct trace_array *tr; | |
8223 | unsigned int index; | |
a8259075 SR |
8224 | char *buf; |
8225 | ||
9a38a885 SRRH |
8226 | get_tr_index(tr_index, &tr, &index); |
8227 | ||
8228 | if (tr->trace_flags & (1 << index)) | |
a8259075 SR |
8229 | buf = "1\n"; |
8230 | else | |
8231 | buf = "0\n"; | |
8232 | ||
8233 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
8234 | } | |
8235 | ||
8236 | static ssize_t | |
8237 | trace_options_core_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
8238 | loff_t *ppos) | |
8239 | { | |
9a38a885 SRRH |
8240 | void *tr_index = filp->private_data; |
8241 | struct trace_array *tr; | |
8242 | unsigned int index; | |
a8259075 SR |
8243 | unsigned long val; |
8244 | int ret; | |
8245 | ||
9a38a885 SRRH |
8246 | get_tr_index(tr_index, &tr, &index); |
8247 | ||
22fe9b54 PH |
8248 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
8249 | if (ret) | |
a8259075 SR |
8250 | return ret; |
8251 | ||
f2d84b65 | 8252 | if (val != 0 && val != 1) |
a8259075 | 8253 | return -EINVAL; |
69d34da2 | 8254 | |
3a53acf1 | 8255 | mutex_lock(&event_mutex); |
69d34da2 | 8256 | mutex_lock(&trace_types_lock); |
2b6080f2 | 8257 | ret = set_tracer_flag(tr, 1 << index, val); |
69d34da2 | 8258 | mutex_unlock(&trace_types_lock); |
3a53acf1 | 8259 | mutex_unlock(&event_mutex); |
a8259075 | 8260 | |
613f04a0 SRRH |
8261 | if (ret < 0) |
8262 | return ret; | |
8263 | ||
a8259075 SR |
8264 | *ppos += cnt; |
8265 | ||
8266 | return cnt; | |
8267 | } | |
8268 | ||
a8259075 SR |
8269 | static const struct file_operations trace_options_core_fops = { |
8270 | .open = tracing_open_generic, | |
8271 | .read = trace_options_core_read, | |
8272 | .write = trace_options_core_write, | |
b444786f | 8273 | .llseek = generic_file_llseek, |
a8259075 SR |
8274 | }; |
8275 | ||
5452af66 | 8276 | struct dentry *trace_create_file(const char *name, |
f4ae40a6 | 8277 | umode_t mode, |
5452af66 FW |
8278 | struct dentry *parent, |
8279 | void *data, | |
8280 | const struct file_operations *fops) | |
8281 | { | |
8282 | struct dentry *ret; | |
8283 | ||
8434dc93 | 8284 | ret = tracefs_create_file(name, mode, parent, data, fops); |
5452af66 | 8285 | if (!ret) |
a395d6a7 | 8286 | pr_warn("Could not create tracefs '%s' entry\n", name); |
5452af66 FW |
8287 | |
8288 | return ret; | |
8289 | } | |
8290 | ||
8291 | ||
2b6080f2 | 8292 | static struct dentry *trace_options_init_dentry(struct trace_array *tr) |
a8259075 SR |
8293 | { |
8294 | struct dentry *d_tracer; | |
a8259075 | 8295 | |
2b6080f2 SR |
8296 | if (tr->options) |
8297 | return tr->options; | |
a8259075 | 8298 | |
7eeafbca | 8299 | d_tracer = tracing_get_dentry(tr); |
14a5ae40 | 8300 | if (IS_ERR(d_tracer)) |
a8259075 SR |
8301 | return NULL; |
8302 | ||
8434dc93 | 8303 | tr->options = tracefs_create_dir("options", d_tracer); |
2b6080f2 | 8304 | if (!tr->options) { |
a395d6a7 | 8305 | pr_warn("Could not create tracefs directory 'options'\n"); |
a8259075 SR |
8306 | return NULL; |
8307 | } | |
8308 | ||
2b6080f2 | 8309 | return tr->options; |
a8259075 SR |
8310 | } |
8311 | ||
577b785f | 8312 | static void |
2b6080f2 SR |
8313 | create_trace_option_file(struct trace_array *tr, |
8314 | struct trace_option_dentry *topt, | |
577b785f SR |
8315 | struct tracer_flags *flags, |
8316 | struct tracer_opt *opt) | |
8317 | { | |
8318 | struct dentry *t_options; | |
577b785f | 8319 | |
2b6080f2 | 8320 | t_options = trace_options_init_dentry(tr); |
577b785f SR |
8321 | if (!t_options) |
8322 | return; | |
8323 | ||
8324 | topt->flags = flags; | |
8325 | topt->opt = opt; | |
2b6080f2 | 8326 | topt->tr = tr; |
577b785f | 8327 | |
5452af66 | 8328 | topt->entry = trace_create_file(opt->name, 0644, t_options, topt, |
577b785f SR |
8329 | &trace_options_fops); |
8330 | ||
577b785f SR |
8331 | } |
8332 | ||
37aea98b | 8333 | static void |
2b6080f2 | 8334 | create_trace_option_files(struct trace_array *tr, struct tracer *tracer) |
577b785f SR |
8335 | { |
8336 | struct trace_option_dentry *topts; | |
37aea98b | 8337 | struct trace_options *tr_topts; |
577b785f SR |
8338 | struct tracer_flags *flags; |
8339 | struct tracer_opt *opts; | |
8340 | int cnt; | |
37aea98b | 8341 | int i; |
577b785f SR |
8342 | |
8343 | if (!tracer) | |
37aea98b | 8344 | return; |
577b785f SR |
8345 | |
8346 | flags = tracer->flags; | |
8347 | ||
8348 | if (!flags || !flags->opts) | |
37aea98b SRRH |
8349 | return; |
8350 | ||
8351 | /* | |
8352 | * If this is an instance, only create flags for tracers | |
8353 | * the instance may have. | |
8354 | */ | |
8355 | if (!trace_ok_for_array(tracer, tr)) | |
8356 | return; | |
8357 | ||
8358 | for (i = 0; i < tr->nr_topts; i++) { | |
d39cdd20 CH |
8359 | /* Make sure there's no duplicate flags. */ |
8360 | if (WARN_ON_ONCE(tr->topts[i].tracer->flags == tracer->flags)) | |
37aea98b SRRH |
8361 | return; |
8362 | } | |
577b785f SR |
8363 | |
8364 | opts = flags->opts; | |
8365 | ||
8366 | for (cnt = 0; opts[cnt].name; cnt++) | |
8367 | ; | |
8368 | ||
0cfe8245 | 8369 | topts = kcalloc(cnt + 1, sizeof(*topts), GFP_KERNEL); |
577b785f | 8370 | if (!topts) |
37aea98b SRRH |
8371 | return; |
8372 | ||
8373 | tr_topts = krealloc(tr->topts, sizeof(*tr->topts) * (tr->nr_topts + 1), | |
8374 | GFP_KERNEL); | |
8375 | if (!tr_topts) { | |
8376 | kfree(topts); | |
8377 | return; | |
8378 | } | |
8379 | ||
8380 | tr->topts = tr_topts; | |
8381 | tr->topts[tr->nr_topts].tracer = tracer; | |
8382 | tr->topts[tr->nr_topts].topts = topts; | |
8383 | tr->nr_topts++; | |
577b785f | 8384 | |
41d9c0be | 8385 | for (cnt = 0; opts[cnt].name; cnt++) { |
2b6080f2 | 8386 | create_trace_option_file(tr, &topts[cnt], flags, |
577b785f | 8387 | &opts[cnt]); |
24589e3a | 8388 | MEM_FAIL(topts[cnt].entry == NULL, |
41d9c0be SRRH |
8389 | "Failed to create trace option: %s", |
8390 | opts[cnt].name); | |
8391 | } | |
577b785f SR |
8392 | } |
8393 | ||
a8259075 | 8394 | static struct dentry * |
2b6080f2 SR |
8395 | create_trace_option_core_file(struct trace_array *tr, |
8396 | const char *option, long index) | |
a8259075 SR |
8397 | { |
8398 | struct dentry *t_options; | |
a8259075 | 8399 | |
2b6080f2 | 8400 | t_options = trace_options_init_dentry(tr); |
a8259075 SR |
8401 | if (!t_options) |
8402 | return NULL; | |
8403 | ||
9a38a885 SRRH |
8404 | return trace_create_file(option, 0644, t_options, |
8405 | (void *)&tr->trace_flags_index[index], | |
8406 | &trace_options_core_fops); | |
a8259075 SR |
8407 | } |
8408 | ||
16270145 | 8409 | static void create_trace_options_dir(struct trace_array *tr) |
a8259075 SR |
8410 | { |
8411 | struct dentry *t_options; | |
16270145 | 8412 | bool top_level = tr == &global_trace; |
a8259075 SR |
8413 | int i; |
8414 | ||
2b6080f2 | 8415 | t_options = trace_options_init_dentry(tr); |
a8259075 SR |
8416 | if (!t_options) |
8417 | return; | |
8418 | ||
16270145 SRRH |
8419 | for (i = 0; trace_options[i]; i++) { |
8420 | if (top_level || | |
8421 | !((1 << i) & TOP_LEVEL_TRACE_FLAGS)) | |
8422 | create_trace_option_core_file(tr, trace_options[i], i); | |
8423 | } | |
a8259075 SR |
8424 | } |
8425 | ||
499e5470 SR |
8426 | static ssize_t |
8427 | rb_simple_read(struct file *filp, char __user *ubuf, | |
8428 | size_t cnt, loff_t *ppos) | |
8429 | { | |
348f0fc2 | 8430 | struct trace_array *tr = filp->private_data; |
499e5470 SR |
8431 | char buf[64]; |
8432 | int r; | |
8433 | ||
10246fa3 | 8434 | r = tracer_tracing_is_on(tr); |
499e5470 SR |
8435 | r = sprintf(buf, "%d\n", r); |
8436 | ||
8437 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
8438 | } | |
8439 | ||
8440 | static ssize_t | |
8441 | rb_simple_write(struct file *filp, const char __user *ubuf, | |
8442 | size_t cnt, loff_t *ppos) | |
8443 | { | |
348f0fc2 | 8444 | struct trace_array *tr = filp->private_data; |
13292494 | 8445 | struct trace_buffer *buffer = tr->array_buffer.buffer; |
499e5470 SR |
8446 | unsigned long val; |
8447 | int ret; | |
8448 | ||
8449 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); | |
8450 | if (ret) | |
8451 | return ret; | |
8452 | ||
8453 | if (buffer) { | |
2df8f8a6 | 8454 | mutex_lock(&trace_types_lock); |
f143641b SRV |
8455 | if (!!val == tracer_tracing_is_on(tr)) { |
8456 | val = 0; /* do nothing */ | |
8457 | } else if (val) { | |
10246fa3 | 8458 | tracer_tracing_on(tr); |
2b6080f2 SR |
8459 | if (tr->current_trace->start) |
8460 | tr->current_trace->start(tr); | |
2df8f8a6 | 8461 | } else { |
10246fa3 | 8462 | tracer_tracing_off(tr); |
2b6080f2 SR |
8463 | if (tr->current_trace->stop) |
8464 | tr->current_trace->stop(tr); | |
2df8f8a6 SR |
8465 | } |
8466 | mutex_unlock(&trace_types_lock); | |
499e5470 SR |
8467 | } |
8468 | ||
8469 | (*ppos)++; | |
8470 | ||
8471 | return cnt; | |
8472 | } | |
8473 | ||
8474 | static const struct file_operations rb_simple_fops = { | |
7b85af63 | 8475 | .open = tracing_open_generic_tr, |
499e5470 SR |
8476 | .read = rb_simple_read, |
8477 | .write = rb_simple_write, | |
7b85af63 | 8478 | .release = tracing_release_generic_tr, |
499e5470 SR |
8479 | .llseek = default_llseek, |
8480 | }; | |
8481 | ||
03329f99 SRV |
8482 | static ssize_t |
8483 | buffer_percent_read(struct file *filp, char __user *ubuf, | |
8484 | size_t cnt, loff_t *ppos) | |
8485 | { | |
8486 | struct trace_array *tr = filp->private_data; | |
8487 | char buf[64]; | |
8488 | int r; | |
8489 | ||
8490 | r = tr->buffer_percent; | |
8491 | r = sprintf(buf, "%d\n", r); | |
8492 | ||
8493 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
8494 | } | |
8495 | ||
8496 | static ssize_t | |
8497 | buffer_percent_write(struct file *filp, const char __user *ubuf, | |
8498 | size_t cnt, loff_t *ppos) | |
8499 | { | |
8500 | struct trace_array *tr = filp->private_data; | |
8501 | unsigned long val; | |
8502 | int ret; | |
8503 | ||
8504 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); | |
8505 | if (ret) | |
8506 | return ret; | |
8507 | ||
8508 | if (val > 100) | |
8509 | return -EINVAL; | |
8510 | ||
8511 | if (!val) | |
8512 | val = 1; | |
8513 | ||
8514 | tr->buffer_percent = val; | |
8515 | ||
8516 | (*ppos)++; | |
8517 | ||
8518 | return cnt; | |
8519 | } | |
8520 | ||
8521 | static const struct file_operations buffer_percent_fops = { | |
8522 | .open = tracing_open_generic_tr, | |
8523 | .read = buffer_percent_read, | |
8524 | .write = buffer_percent_write, | |
8525 | .release = tracing_release_generic_tr, | |
8526 | .llseek = default_llseek, | |
8527 | }; | |
8528 | ||
ff585c5b | 8529 | static struct dentry *trace_instance_dir; |
277ba044 SR |
8530 | |
8531 | static void | |
8434dc93 | 8532 | init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer); |
277ba044 | 8533 | |
55034cd6 | 8534 | static int |
1c5eb448 | 8535 | allocate_trace_buffer(struct trace_array *tr, struct array_buffer *buf, int size) |
277ba044 SR |
8536 | { |
8537 | enum ring_buffer_flags rb_flags; | |
737223fb | 8538 | |
983f938a | 8539 | rb_flags = tr->trace_flags & TRACE_ITER_OVERWRITE ? RB_FL_OVERWRITE : 0; |
737223fb | 8540 | |
dced341b SRRH |
8541 | buf->tr = tr; |
8542 | ||
55034cd6 SRRH |
8543 | buf->buffer = ring_buffer_alloc(size, rb_flags); |
8544 | if (!buf->buffer) | |
8545 | return -ENOMEM; | |
737223fb | 8546 | |
55034cd6 SRRH |
8547 | buf->data = alloc_percpu(struct trace_array_cpu); |
8548 | if (!buf->data) { | |
8549 | ring_buffer_free(buf->buffer); | |
4397f045 | 8550 | buf->buffer = NULL; |
55034cd6 SRRH |
8551 | return -ENOMEM; |
8552 | } | |
737223fb | 8553 | |
737223fb | 8554 | /* Allocate the first page for all buffers */ |
1c5eb448 SRV |
8555 | set_buffer_entries(&tr->array_buffer, |
8556 | ring_buffer_size(tr->array_buffer.buffer, 0)); | |
737223fb | 8557 | |
55034cd6 SRRH |
8558 | return 0; |
8559 | } | |
737223fb | 8560 | |
55034cd6 SRRH |
8561 | static int allocate_trace_buffers(struct trace_array *tr, int size) |
8562 | { | |
8563 | int ret; | |
737223fb | 8564 | |
1c5eb448 | 8565 | ret = allocate_trace_buffer(tr, &tr->array_buffer, size); |
55034cd6 SRRH |
8566 | if (ret) |
8567 | return ret; | |
737223fb | 8568 | |
55034cd6 SRRH |
8569 | #ifdef CONFIG_TRACER_MAX_TRACE |
8570 | ret = allocate_trace_buffer(tr, &tr->max_buffer, | |
8571 | allocate_snapshot ? size : 1); | |
24589e3a | 8572 | if (MEM_FAIL(ret, "Failed to allocate trace buffer\n")) { |
1c5eb448 SRV |
8573 | ring_buffer_free(tr->array_buffer.buffer); |
8574 | tr->array_buffer.buffer = NULL; | |
8575 | free_percpu(tr->array_buffer.data); | |
8576 | tr->array_buffer.data = NULL; | |
55034cd6 SRRH |
8577 | return -ENOMEM; |
8578 | } | |
8579 | tr->allocated_snapshot = allocate_snapshot; | |
737223fb | 8580 | |
55034cd6 SRRH |
8581 | /* |
8582 | * Only the top level trace array gets its snapshot allocated | |
8583 | * from the kernel command line. | |
8584 | */ | |
8585 | allocate_snapshot = false; | |
737223fb | 8586 | #endif |
11f5efc3 | 8587 | |
55034cd6 | 8588 | return 0; |
737223fb SRRH |
8589 | } |
8590 | ||
1c5eb448 | 8591 | static void free_trace_buffer(struct array_buffer *buf) |
f0b70cc4 SRRH |
8592 | { |
8593 | if (buf->buffer) { | |
8594 | ring_buffer_free(buf->buffer); | |
8595 | buf->buffer = NULL; | |
8596 | free_percpu(buf->data); | |
8597 | buf->data = NULL; | |
8598 | } | |
8599 | } | |
8600 | ||
23aaa3c1 SRRH |
8601 | static void free_trace_buffers(struct trace_array *tr) |
8602 | { | |
8603 | if (!tr) | |
8604 | return; | |
8605 | ||
1c5eb448 | 8606 | free_trace_buffer(&tr->array_buffer); |
23aaa3c1 SRRH |
8607 | |
8608 | #ifdef CONFIG_TRACER_MAX_TRACE | |
f0b70cc4 | 8609 | free_trace_buffer(&tr->max_buffer); |
23aaa3c1 SRRH |
8610 | #endif |
8611 | } | |
8612 | ||
9a38a885 SRRH |
8613 | static void init_trace_flags_index(struct trace_array *tr) |
8614 | { | |
8615 | int i; | |
8616 | ||
8617 | /* Used by the trace options files */ | |
8618 | for (i = 0; i < TRACE_FLAGS_MAX_SIZE; i++) | |
8619 | tr->trace_flags_index[i] = i; | |
8620 | } | |
8621 | ||
37aea98b SRRH |
8622 | static void __update_tracer_options(struct trace_array *tr) |
8623 | { | |
8624 | struct tracer *t; | |
8625 | ||
8626 | for (t = trace_types; t; t = t->next) | |
8627 | add_tracer_options(tr, t); | |
8628 | } | |
8629 | ||
8630 | static void update_tracer_options(struct trace_array *tr) | |
8631 | { | |
8632 | mutex_lock(&trace_types_lock); | |
8633 | __update_tracer_options(tr); | |
8634 | mutex_unlock(&trace_types_lock); | |
8635 | } | |
8636 | ||
89c95fce TZ |
8637 | /* Must have trace_types_lock held */ |
8638 | struct trace_array *trace_array_find(const char *instance) | |
8639 | { | |
8640 | struct trace_array *tr, *found = NULL; | |
8641 | ||
8642 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
8643 | if (tr->name && strcmp(tr->name, instance) == 0) { | |
8644 | found = tr; | |
8645 | break; | |
8646 | } | |
8647 | } | |
8648 | ||
8649 | return found; | |
8650 | } | |
8651 | ||
8652 | struct trace_array *trace_array_find_get(const char *instance) | |
8653 | { | |
8654 | struct trace_array *tr; | |
8655 | ||
8656 | mutex_lock(&trace_types_lock); | |
8657 | tr = trace_array_find(instance); | |
8658 | if (tr) | |
8659 | tr->ref++; | |
8660 | mutex_unlock(&trace_types_lock); | |
8661 | ||
8662 | return tr; | |
8663 | } | |
8664 | ||
4114fbfd MH |
8665 | static int trace_array_create_dir(struct trace_array *tr) |
8666 | { | |
8667 | int ret; | |
8668 | ||
8669 | tr->dir = tracefs_create_dir(tr->name, trace_instance_dir); | |
8670 | if (!tr->dir) | |
8671 | return -EINVAL; | |
8672 | ||
8673 | ret = event_trace_add_tracer(tr->dir, tr); | |
8674 | if (ret) | |
8675 | tracefs_remove(tr->dir); | |
8676 | ||
8677 | init_tracer_tracefs(tr, tr->dir); | |
8678 | __update_tracer_options(tr); | |
8679 | ||
8680 | return ret; | |
8681 | } | |
8682 | ||
28879787 | 8683 | static struct trace_array *trace_array_create(const char *name) |
737223fb | 8684 | { |
277ba044 SR |
8685 | struct trace_array *tr; |
8686 | int ret; | |
277ba044 | 8687 | |
277ba044 SR |
8688 | ret = -ENOMEM; |
8689 | tr = kzalloc(sizeof(*tr), GFP_KERNEL); | |
8690 | if (!tr) | |
28879787 | 8691 | return ERR_PTR(ret); |
277ba044 SR |
8692 | |
8693 | tr->name = kstrdup(name, GFP_KERNEL); | |
8694 | if (!tr->name) | |
8695 | goto out_free_tr; | |
8696 | ||
ccfe9e42 AL |
8697 | if (!alloc_cpumask_var(&tr->tracing_cpumask, GFP_KERNEL)) |
8698 | goto out_free_tr; | |
8699 | ||
20550622 | 8700 | tr->trace_flags = global_trace.trace_flags & ~ZEROED_TRACE_FLAGS; |
983f938a | 8701 | |
ccfe9e42 AL |
8702 | cpumask_copy(tr->tracing_cpumask, cpu_all_mask); |
8703 | ||
277ba044 SR |
8704 | raw_spin_lock_init(&tr->start_lock); |
8705 | ||
0b9b12c1 SRRH |
8706 | tr->max_lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED; |
8707 | ||
277ba044 SR |
8708 | tr->current_trace = &nop_trace; |
8709 | ||
8710 | INIT_LIST_HEAD(&tr->systems); | |
8711 | INIT_LIST_HEAD(&tr->events); | |
067fe038 | 8712 | INIT_LIST_HEAD(&tr->hist_vars); |
2f754e77 | 8713 | INIT_LIST_HEAD(&tr->err_log); |
277ba044 | 8714 | |
737223fb | 8715 | if (allocate_trace_buffers(tr, trace_buf_size) < 0) |
277ba044 SR |
8716 | goto out_free_tr; |
8717 | ||
4114fbfd | 8718 | if (ftrace_allocate_ftrace_ops(tr) < 0) |
277ba044 SR |
8719 | goto out_free_tr; |
8720 | ||
04ec7bb6 SRV |
8721 | ftrace_init_trace_array(tr); |
8722 | ||
9a38a885 | 8723 | init_trace_flags_index(tr); |
4114fbfd MH |
8724 | |
8725 | if (trace_instance_dir) { | |
8726 | ret = trace_array_create_dir(tr); | |
8727 | if (ret) | |
8728 | goto out_free_tr; | |
720dee53 MH |
8729 | } else |
8730 | __trace_early_add_events(tr); | |
277ba044 SR |
8731 | |
8732 | list_add(&tr->list, &ftrace_trace_arrays); | |
8733 | ||
28879787 DI |
8734 | tr->ref++; |
8735 | ||
f45d1225 | 8736 | return tr; |
277ba044 SR |
8737 | |
8738 | out_free_tr: | |
4114fbfd | 8739 | ftrace_free_ftrace_ops(tr); |
23aaa3c1 | 8740 | free_trace_buffers(tr); |
ccfe9e42 | 8741 | free_cpumask_var(tr->tracing_cpumask); |
277ba044 SR |
8742 | kfree(tr->name); |
8743 | kfree(tr); | |
8744 | ||
f45d1225 DI |
8745 | return ERR_PTR(ret); |
8746 | } | |
277ba044 | 8747 | |
f45d1225 DI |
8748 | static int instance_mkdir(const char *name) |
8749 | { | |
28879787 DI |
8750 | struct trace_array *tr; |
8751 | int ret; | |
8752 | ||
8753 | mutex_lock(&event_mutex); | |
8754 | mutex_lock(&trace_types_lock); | |
8755 | ||
8756 | ret = -EEXIST; | |
89c95fce TZ |
8757 | if (trace_array_find(name)) |
8758 | goto out_unlock; | |
28879787 DI |
8759 | |
8760 | tr = trace_array_create(name); | |
8761 | ||
8762 | ret = PTR_ERR_OR_ZERO(tr); | |
8763 | ||
8764 | out_unlock: | |
8765 | mutex_unlock(&trace_types_lock); | |
8766 | mutex_unlock(&event_mutex); | |
8767 | return ret; | |
8768 | } | |
8769 | ||
8770 | /** | |
8771 | * trace_array_get_by_name - Create/Lookup a trace array, given its name. | |
8772 | * @name: The name of the trace array to be looked up/created. | |
8773 | * | |
8774 | * Returns pointer to trace array with given name. | |
8775 | * NULL, if it cannot be created. | |
8776 | * | |
8777 | * NOTE: This function increments the reference counter associated with the | |
8778 | * trace array returned. This makes sure it cannot be freed while in use. | |
8779 | * Use trace_array_put() once the trace array is no longer needed. | |
28394da2 SRV |
8780 | * If the trace_array is to be freed, trace_array_destroy() needs to |
8781 | * be called after the trace_array_put(), or simply let user space delete | |
8782 | * it from the tracefs instances directory. But until the | |
8783 | * trace_array_put() is called, user space can not delete it. | |
28879787 DI |
8784 | * |
8785 | */ | |
8786 | struct trace_array *trace_array_get_by_name(const char *name) | |
8787 | { | |
8788 | struct trace_array *tr; | |
8789 | ||
8790 | mutex_lock(&event_mutex); | |
8791 | mutex_lock(&trace_types_lock); | |
8792 | ||
8793 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
8794 | if (tr->name && strcmp(tr->name, name) == 0) | |
8795 | goto out_unlock; | |
8796 | } | |
8797 | ||
8798 | tr = trace_array_create(name); | |
8799 | ||
8800 | if (IS_ERR(tr)) | |
8801 | tr = NULL; | |
8802 | out_unlock: | |
8803 | if (tr) | |
8804 | tr->ref++; | |
8805 | ||
8806 | mutex_unlock(&trace_types_lock); | |
8807 | mutex_unlock(&event_mutex); | |
8808 | return tr; | |
277ba044 | 8809 | } |
28879787 | 8810 | EXPORT_SYMBOL_GPL(trace_array_get_by_name); |
277ba044 | 8811 | |
f45d1225 | 8812 | static int __remove_instance(struct trace_array *tr) |
0c8916c3 | 8813 | { |
37aea98b | 8814 | int i; |
0c8916c3 | 8815 | |
28879787 | 8816 | /* Reference counter for a newly created trace array = 1. */ |
7ef282e0 | 8817 | if (tr->ref > 1 || (tr->current_trace && tr->trace_ref)) |
f45d1225 | 8818 | return -EBUSY; |
a695cb58 | 8819 | |
0c8916c3 SR |
8820 | list_del(&tr->list); |
8821 | ||
20550622 SRRH |
8822 | /* Disable all the flags that were enabled coming in */ |
8823 | for (i = 0; i < TRACE_FLAGS_MAX_SIZE; i++) { | |
8824 | if ((1 << i) & ZEROED_TRACE_FLAGS) | |
8825 | set_tracer_flag(tr, 1 << i, 0); | |
8826 | } | |
8827 | ||
6b450d25 | 8828 | tracing_set_nop(tr); |
a0e6369e | 8829 | clear_ftrace_function_probes(tr); |
0c8916c3 | 8830 | event_trace_del_tracer(tr); |
d879d0b8 | 8831 | ftrace_clear_pids(tr); |
591dffda | 8832 | ftrace_destroy_function_files(tr); |
a3d1e7eb | 8833 | tracefs_remove(tr->dir); |
a9fcaaac | 8834 | free_trace_buffers(tr); |
0c8916c3 | 8835 | |
37aea98b SRRH |
8836 | for (i = 0; i < tr->nr_topts; i++) { |
8837 | kfree(tr->topts[i].topts); | |
8838 | } | |
8839 | kfree(tr->topts); | |
8840 | ||
db9108e0 | 8841 | free_cpumask_var(tr->tracing_cpumask); |
0c8916c3 SR |
8842 | kfree(tr->name); |
8843 | kfree(tr); | |
8844 | ||
f45d1225 DI |
8845 | return 0; |
8846 | } | |
8847 | ||
e585e646 | 8848 | int trace_array_destroy(struct trace_array *this_tr) |
f45d1225 | 8849 | { |
e585e646 | 8850 | struct trace_array *tr; |
f45d1225 DI |
8851 | int ret; |
8852 | ||
e585e646 | 8853 | if (!this_tr) |
f45d1225 DI |
8854 | return -EINVAL; |
8855 | ||
8856 | mutex_lock(&event_mutex); | |
8857 | mutex_lock(&trace_types_lock); | |
8858 | ||
e585e646 DI |
8859 | ret = -ENODEV; |
8860 | ||
8861 | /* Making sure trace array exists before destroying it. */ | |
8862 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
8863 | if (tr == this_tr) { | |
8864 | ret = __remove_instance(tr); | |
8865 | break; | |
8866 | } | |
8867 | } | |
f45d1225 DI |
8868 | |
8869 | mutex_unlock(&trace_types_lock); | |
8870 | mutex_unlock(&event_mutex); | |
8871 | ||
8872 | return ret; | |
8873 | } | |
8874 | EXPORT_SYMBOL_GPL(trace_array_destroy); | |
8875 | ||
8876 | static int instance_rmdir(const char *name) | |
8877 | { | |
8878 | struct trace_array *tr; | |
8879 | int ret; | |
8880 | ||
8881 | mutex_lock(&event_mutex); | |
8882 | mutex_lock(&trace_types_lock); | |
8883 | ||
8884 | ret = -ENODEV; | |
89c95fce TZ |
8885 | tr = trace_array_find(name); |
8886 | if (tr) | |
8887 | ret = __remove_instance(tr); | |
0c8916c3 | 8888 | |
0c8916c3 | 8889 | mutex_unlock(&trace_types_lock); |
12ecef0c | 8890 | mutex_unlock(&event_mutex); |
0c8916c3 SR |
8891 | |
8892 | return ret; | |
8893 | } | |
8894 | ||
277ba044 SR |
8895 | static __init void create_trace_instances(struct dentry *d_tracer) |
8896 | { | |
4114fbfd MH |
8897 | struct trace_array *tr; |
8898 | ||
eae47358 SRRH |
8899 | trace_instance_dir = tracefs_create_instance_dir("instances", d_tracer, |
8900 | instance_mkdir, | |
8901 | instance_rmdir); | |
24589e3a | 8902 | if (MEM_FAIL(!trace_instance_dir, "Failed to create instances directory\n")) |
277ba044 | 8903 | return; |
4114fbfd MH |
8904 | |
8905 | mutex_lock(&event_mutex); | |
8906 | mutex_lock(&trace_types_lock); | |
8907 | ||
8908 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
8909 | if (!tr->name) | |
8910 | continue; | |
8911 | if (MEM_FAIL(trace_array_create_dir(tr) < 0, | |
8912 | "Failed to create instance directory\n")) | |
8913 | break; | |
8914 | } | |
8915 | ||
8916 | mutex_unlock(&trace_types_lock); | |
8917 | mutex_unlock(&event_mutex); | |
277ba044 SR |
8918 | } |
8919 | ||
2b6080f2 | 8920 | static void |
8434dc93 | 8921 | init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer) |
2b6080f2 | 8922 | { |
3dd80953 | 8923 | struct trace_event_file *file; |
121aaee7 | 8924 | int cpu; |
2b6080f2 | 8925 | |
607e2ea1 SRRH |
8926 | trace_create_file("available_tracers", 0444, d_tracer, |
8927 | tr, &show_traces_fops); | |
8928 | ||
8929 | trace_create_file("current_tracer", 0644, d_tracer, | |
8930 | tr, &set_tracer_fops); | |
8931 | ||
ccfe9e42 AL |
8932 | trace_create_file("tracing_cpumask", 0644, d_tracer, |
8933 | tr, &tracing_cpumask_fops); | |
8934 | ||
2b6080f2 SR |
8935 | trace_create_file("trace_options", 0644, d_tracer, |
8936 | tr, &tracing_iter_fops); | |
8937 | ||
8938 | trace_create_file("trace", 0644, d_tracer, | |
6484c71c | 8939 | tr, &tracing_fops); |
2b6080f2 SR |
8940 | |
8941 | trace_create_file("trace_pipe", 0444, d_tracer, | |
15544209 | 8942 | tr, &tracing_pipe_fops); |
2b6080f2 SR |
8943 | |
8944 | trace_create_file("buffer_size_kb", 0644, d_tracer, | |
0bc392ee | 8945 | tr, &tracing_entries_fops); |
2b6080f2 SR |
8946 | |
8947 | trace_create_file("buffer_total_size_kb", 0444, d_tracer, | |
8948 | tr, &tracing_total_entries_fops); | |
8949 | ||
238ae93d | 8950 | trace_create_file("free_buffer", 0200, d_tracer, |
2b6080f2 SR |
8951 | tr, &tracing_free_buffer_fops); |
8952 | ||
8953 | trace_create_file("trace_marker", 0220, d_tracer, | |
8954 | tr, &tracing_mark_fops); | |
8955 | ||
3dd80953 SRV |
8956 | file = __find_event_file(tr, "ftrace", "print"); |
8957 | if (file && file->dir) | |
8958 | trace_create_file("trigger", 0644, file->dir, file, | |
8959 | &event_trigger_fops); | |
8960 | tr->trace_marker_file = file; | |
8961 | ||
fa32e855 SR |
8962 | trace_create_file("trace_marker_raw", 0220, d_tracer, |
8963 | tr, &tracing_mark_raw_fops); | |
8964 | ||
2b6080f2 SR |
8965 | trace_create_file("trace_clock", 0644, d_tracer, tr, |
8966 | &trace_clock_fops); | |
8967 | ||
8968 | trace_create_file("tracing_on", 0644, d_tracer, | |
6484c71c | 8969 | tr, &rb_simple_fops); |
ce9bae55 | 8970 | |
2c1ea60b TZ |
8971 | trace_create_file("timestamp_mode", 0444, d_tracer, tr, |
8972 | &trace_time_stamp_mode_fops); | |
8973 | ||
a7b1d74e | 8974 | tr->buffer_percent = 50; |
03329f99 SRV |
8975 | |
8976 | trace_create_file("buffer_percent", 0444, d_tracer, | |
8977 | tr, &buffer_percent_fops); | |
8978 | ||
16270145 SRRH |
8979 | create_trace_options_dir(tr); |
8980 | ||
f971cc9a | 8981 | #if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER) |
91edde2e | 8982 | trace_create_maxlat_file(tr, d_tracer); |
6d9b3fa5 SRRH |
8983 | #endif |
8984 | ||
591dffda | 8985 | if (ftrace_create_function_files(tr, d_tracer)) |
24589e3a | 8986 | MEM_FAIL(1, "Could not allocate function filter files"); |
591dffda | 8987 | |
ce9bae55 SRRH |
8988 | #ifdef CONFIG_TRACER_SNAPSHOT |
8989 | trace_create_file("snapshot", 0644, d_tracer, | |
6484c71c | 8990 | tr, &snapshot_fops); |
ce9bae55 | 8991 | #endif |
121aaee7 | 8992 | |
8a062902 TZ |
8993 | trace_create_file("error_log", 0644, d_tracer, |
8994 | tr, &tracing_err_log_fops); | |
8995 | ||
121aaee7 | 8996 | for_each_tracing_cpu(cpu) |
8434dc93 | 8997 | tracing_init_tracefs_percpu(tr, cpu); |
121aaee7 | 8998 | |
345ddcc8 | 8999 | ftrace_init_tracefs(tr, d_tracer); |
2b6080f2 SR |
9000 | } |
9001 | ||
93faccbb | 9002 | static struct vfsmount *trace_automount(struct dentry *mntpt, void *ingore) |
f76180bc SRRH |
9003 | { |
9004 | struct vfsmount *mnt; | |
9005 | struct file_system_type *type; | |
9006 | ||
9007 | /* | |
9008 | * To maintain backward compatibility for tools that mount | |
9009 | * debugfs to get to the tracing facility, tracefs is automatically | |
9010 | * mounted to the debugfs/tracing directory. | |
9011 | */ | |
9012 | type = get_fs_type("tracefs"); | |
9013 | if (!type) | |
9014 | return NULL; | |
93faccbb | 9015 | mnt = vfs_submount(mntpt, type, "tracefs", NULL); |
f76180bc SRRH |
9016 | put_filesystem(type); |
9017 | if (IS_ERR(mnt)) | |
9018 | return NULL; | |
9019 | mntget(mnt); | |
9020 | ||
9021 | return mnt; | |
9022 | } | |
9023 | ||
7eeafbca SRRH |
9024 | /** |
9025 | * tracing_init_dentry - initialize top level trace array | |
9026 | * | |
9027 | * This is called when creating files or directories in the tracing | |
9028 | * directory. It is called via fs_initcall() by any of the boot up code | |
9029 | * and expects to return the dentry of the top level tracing directory. | |
9030 | */ | |
22c36b18 | 9031 | int tracing_init_dentry(void) |
7eeafbca SRRH |
9032 | { |
9033 | struct trace_array *tr = &global_trace; | |
9034 | ||
a356646a | 9035 | if (security_locked_down(LOCKDOWN_TRACEFS)) { |
ee195452 | 9036 | pr_warn("Tracing disabled due to lockdown\n"); |
22c36b18 | 9037 | return -EPERM; |
a356646a SRV |
9038 | } |
9039 | ||
f76180bc | 9040 | /* The top level trace array uses NULL as parent */ |
7eeafbca | 9041 | if (tr->dir) |
22c36b18 | 9042 | return 0; |
7eeafbca | 9043 | |
072e133d | 9044 | if (WARN_ON(!tracefs_initialized())) |
22c36b18 | 9045 | return -ENODEV; |
7eeafbca | 9046 | |
f76180bc SRRH |
9047 | /* |
9048 | * As there may still be users that expect the tracing | |
9049 | * files to exist in debugfs/tracing, we must automount | |
9050 | * the tracefs file system there, so older tools still | |
9051 | * work with the newer kerenl. | |
9052 | */ | |
9053 | tr->dir = debugfs_create_automount("tracing", NULL, | |
9054 | trace_automount, NULL); | |
7eeafbca | 9055 | |
22c36b18 | 9056 | return 0; |
7eeafbca SRRH |
9057 | } |
9058 | ||
00f4b652 JL |
9059 | extern struct trace_eval_map *__start_ftrace_eval_maps[]; |
9060 | extern struct trace_eval_map *__stop_ftrace_eval_maps[]; | |
0c564a53 | 9061 | |
5f60b351 | 9062 | static void __init trace_eval_init(void) |
0c564a53 | 9063 | { |
3673b8e4 SRRH |
9064 | int len; |
9065 | ||
02fd7f68 | 9066 | len = __stop_ftrace_eval_maps - __start_ftrace_eval_maps; |
f57a4143 | 9067 | trace_insert_eval_map(NULL, __start_ftrace_eval_maps, len); |
3673b8e4 SRRH |
9068 | } |
9069 | ||
9070 | #ifdef CONFIG_MODULES | |
f57a4143 | 9071 | static void trace_module_add_evals(struct module *mod) |
3673b8e4 | 9072 | { |
99be647c | 9073 | if (!mod->num_trace_evals) |
3673b8e4 SRRH |
9074 | return; |
9075 | ||
9076 | /* | |
9077 | * Modules with bad taint do not have events created, do | |
9078 | * not bother with enums either. | |
9079 | */ | |
9080 | if (trace_module_has_bad_taint(mod)) | |
9081 | return; | |
9082 | ||
f57a4143 | 9083 | trace_insert_eval_map(mod, mod->trace_evals, mod->num_trace_evals); |
3673b8e4 SRRH |
9084 | } |
9085 | ||
681bec03 | 9086 | #ifdef CONFIG_TRACE_EVAL_MAP_FILE |
f57a4143 | 9087 | static void trace_module_remove_evals(struct module *mod) |
9828413d | 9088 | { |
23bf8cb8 JL |
9089 | union trace_eval_map_item *map; |
9090 | union trace_eval_map_item **last = &trace_eval_maps; | |
9828413d | 9091 | |
99be647c | 9092 | if (!mod->num_trace_evals) |
9828413d SRRH |
9093 | return; |
9094 | ||
1793ed93 | 9095 | mutex_lock(&trace_eval_mutex); |
9828413d | 9096 | |
23bf8cb8 | 9097 | map = trace_eval_maps; |
9828413d SRRH |
9098 | |
9099 | while (map) { | |
9100 | if (map->head.mod == mod) | |
9101 | break; | |
5f60b351 | 9102 | map = trace_eval_jmp_to_tail(map); |
9828413d SRRH |
9103 | last = &map->tail.next; |
9104 | map = map->tail.next; | |
9105 | } | |
9106 | if (!map) | |
9107 | goto out; | |
9108 | ||
5f60b351 | 9109 | *last = trace_eval_jmp_to_tail(map)->tail.next; |
9828413d SRRH |
9110 | kfree(map); |
9111 | out: | |
1793ed93 | 9112 | mutex_unlock(&trace_eval_mutex); |
9828413d SRRH |
9113 | } |
9114 | #else | |
f57a4143 | 9115 | static inline void trace_module_remove_evals(struct module *mod) { } |
681bec03 | 9116 | #endif /* CONFIG_TRACE_EVAL_MAP_FILE */ |
9828413d | 9117 | |
3673b8e4 SRRH |
9118 | static int trace_module_notify(struct notifier_block *self, |
9119 | unsigned long val, void *data) | |
9120 | { | |
9121 | struct module *mod = data; | |
9122 | ||
9123 | switch (val) { | |
9124 | case MODULE_STATE_COMING: | |
f57a4143 | 9125 | trace_module_add_evals(mod); |
3673b8e4 | 9126 | break; |
9828413d | 9127 | case MODULE_STATE_GOING: |
f57a4143 | 9128 | trace_module_remove_evals(mod); |
9828413d | 9129 | break; |
3673b8e4 SRRH |
9130 | } |
9131 | ||
0340a6b7 | 9132 | return NOTIFY_OK; |
0c564a53 SRRH |
9133 | } |
9134 | ||
3673b8e4 SRRH |
9135 | static struct notifier_block trace_module_nb = { |
9136 | .notifier_call = trace_module_notify, | |
9137 | .priority = 0, | |
9138 | }; | |
9828413d | 9139 | #endif /* CONFIG_MODULES */ |
3673b8e4 | 9140 | |
8434dc93 | 9141 | static __init int tracer_init_tracefs(void) |
bc0c38d1 | 9142 | { |
22c36b18 | 9143 | int ret; |
bc0c38d1 | 9144 | |
7e53bd42 LJ |
9145 | trace_access_lock_init(); |
9146 | ||
22c36b18 WY |
9147 | ret = tracing_init_dentry(); |
9148 | if (ret) | |
ed6f1c99 | 9149 | return 0; |
bc0c38d1 | 9150 | |
58b92547 SRV |
9151 | event_trace_init(); |
9152 | ||
22c36b18 WY |
9153 | init_tracer_tracefs(&global_trace, NULL); |
9154 | ftrace_init_tracefs_toplevel(&global_trace, NULL); | |
bc0c38d1 | 9155 | |
22c36b18 | 9156 | trace_create_file("tracing_thresh", 0644, NULL, |
6508fa76 | 9157 | &global_trace, &tracing_thresh_fops); |
a8259075 | 9158 | |
22c36b18 | 9159 | trace_create_file("README", 0444, NULL, |
5452af66 FW |
9160 | NULL, &tracing_readme_fops); |
9161 | ||
22c36b18 | 9162 | trace_create_file("saved_cmdlines", 0444, NULL, |
69abe6a5 | 9163 | NULL, &tracing_saved_cmdlines_fops); |
5bf9a1ee | 9164 | |
22c36b18 | 9165 | trace_create_file("saved_cmdlines_size", 0644, NULL, |
939c7a4f YY |
9166 | NULL, &tracing_saved_cmdlines_size_fops); |
9167 | ||
22c36b18 | 9168 | trace_create_file("saved_tgids", 0444, NULL, |
99c621d7 MS |
9169 | NULL, &tracing_saved_tgids_fops); |
9170 | ||
5f60b351 | 9171 | trace_eval_init(); |
0c564a53 | 9172 | |
22c36b18 | 9173 | trace_create_eval_file(NULL); |
9828413d | 9174 | |
3673b8e4 SRRH |
9175 | #ifdef CONFIG_MODULES |
9176 | register_module_notifier(&trace_module_nb); | |
9177 | #endif | |
9178 | ||
bc0c38d1 | 9179 | #ifdef CONFIG_DYNAMIC_FTRACE |
22c36b18 | 9180 | trace_create_file("dyn_ftrace_total_info", 0444, NULL, |
da537f0a | 9181 | NULL, &tracing_dyn_info_fops); |
bc0c38d1 | 9182 | #endif |
b04cc6b1 | 9183 | |
22c36b18 | 9184 | create_trace_instances(NULL); |
5452af66 | 9185 | |
37aea98b | 9186 | update_tracer_options(&global_trace); |
09d23a1d | 9187 | |
b5ad384e | 9188 | return 0; |
bc0c38d1 SR |
9189 | } |
9190 | ||
3f5a54e3 SR |
9191 | static int trace_panic_handler(struct notifier_block *this, |
9192 | unsigned long event, void *unused) | |
9193 | { | |
944ac425 | 9194 | if (ftrace_dump_on_oops) |
cecbca96 | 9195 | ftrace_dump(ftrace_dump_on_oops); |
3f5a54e3 SR |
9196 | return NOTIFY_OK; |
9197 | } | |
9198 | ||
9199 | static struct notifier_block trace_panic_notifier = { | |
9200 | .notifier_call = trace_panic_handler, | |
9201 | .next = NULL, | |
9202 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ | |
9203 | }; | |
9204 | ||
9205 | static int trace_die_handler(struct notifier_block *self, | |
9206 | unsigned long val, | |
9207 | void *data) | |
9208 | { | |
9209 | switch (val) { | |
9210 | case DIE_OOPS: | |
944ac425 | 9211 | if (ftrace_dump_on_oops) |
cecbca96 | 9212 | ftrace_dump(ftrace_dump_on_oops); |
3f5a54e3 SR |
9213 | break; |
9214 | default: | |
9215 | break; | |
9216 | } | |
9217 | return NOTIFY_OK; | |
9218 | } | |
9219 | ||
9220 | static struct notifier_block trace_die_notifier = { | |
9221 | .notifier_call = trace_die_handler, | |
9222 | .priority = 200 | |
9223 | }; | |
9224 | ||
9225 | /* | |
9226 | * printk is set to max of 1024, we really don't need it that big. | |
9227 | * Nothing should be printing 1000 characters anyway. | |
9228 | */ | |
9229 | #define TRACE_MAX_PRINT 1000 | |
9230 | ||
9231 | /* | |
9232 | * Define here KERN_TRACE so that we have one place to modify | |
9233 | * it if we decide to change what log level the ftrace dump | |
9234 | * should be at. | |
9235 | */ | |
428aee14 | 9236 | #define KERN_TRACE KERN_EMERG |
3f5a54e3 | 9237 | |
955b61e5 | 9238 | void |
3f5a54e3 SR |
9239 | trace_printk_seq(struct trace_seq *s) |
9240 | { | |
9241 | /* Probably should print a warning here. */ | |
3a161d99 SRRH |
9242 | if (s->seq.len >= TRACE_MAX_PRINT) |
9243 | s->seq.len = TRACE_MAX_PRINT; | |
3f5a54e3 | 9244 | |
820b75f6 SRRH |
9245 | /* |
9246 | * More paranoid code. Although the buffer size is set to | |
9247 | * PAGE_SIZE, and TRACE_MAX_PRINT is 1000, this is just | |
9248 | * an extra layer of protection. | |
9249 | */ | |
9250 | if (WARN_ON_ONCE(s->seq.len >= s->seq.size)) | |
9251 | s->seq.len = s->seq.size - 1; | |
3f5a54e3 SR |
9252 | |
9253 | /* should be zero ended, but we are paranoid. */ | |
3a161d99 | 9254 | s->buffer[s->seq.len] = 0; |
3f5a54e3 SR |
9255 | |
9256 | printk(KERN_TRACE "%s", s->buffer); | |
9257 | ||
f9520750 | 9258 | trace_seq_init(s); |
3f5a54e3 SR |
9259 | } |
9260 | ||
955b61e5 JW |
9261 | void trace_init_global_iter(struct trace_iterator *iter) |
9262 | { | |
9263 | iter->tr = &global_trace; | |
2b6080f2 | 9264 | iter->trace = iter->tr->current_trace; |
ae3b5093 | 9265 | iter->cpu_file = RING_BUFFER_ALL_CPUS; |
1c5eb448 | 9266 | iter->array_buffer = &global_trace.array_buffer; |
b2f974d6 CS |
9267 | |
9268 | if (iter->trace && iter->trace->open) | |
9269 | iter->trace->open(iter); | |
9270 | ||
9271 | /* Annotate start of buffers if we had overruns */ | |
1c5eb448 | 9272 | if (ring_buffer_overruns(iter->array_buffer->buffer)) |
b2f974d6 CS |
9273 | iter->iter_flags |= TRACE_FILE_ANNOTATE; |
9274 | ||
9275 | /* Output in nanoseconds only if we are using a clock in nanoseconds. */ | |
9276 | if (trace_clocks[iter->tr->clock_id].in_ns) | |
9277 | iter->iter_flags |= TRACE_FILE_TIME_IN_NS; | |
955b61e5 JW |
9278 | } |
9279 | ||
7fe70b57 | 9280 | void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) |
3f5a54e3 | 9281 | { |
3f5a54e3 SR |
9282 | /* use static because iter can be a bit big for the stack */ |
9283 | static struct trace_iterator iter; | |
7fe70b57 | 9284 | static atomic_t dump_running; |
983f938a | 9285 | struct trace_array *tr = &global_trace; |
cf586b61 | 9286 | unsigned int old_userobj; |
d769041f SR |
9287 | unsigned long flags; |
9288 | int cnt = 0, cpu; | |
3f5a54e3 | 9289 | |
7fe70b57 SRRH |
9290 | /* Only allow one dump user at a time. */ |
9291 | if (atomic_inc_return(&dump_running) != 1) { | |
9292 | atomic_dec(&dump_running); | |
9293 | return; | |
9294 | } | |
3f5a54e3 | 9295 | |
7fe70b57 SRRH |
9296 | /* |
9297 | * Always turn off tracing when we dump. | |
9298 | * We don't need to show trace output of what happens | |
9299 | * between multiple crashes. | |
9300 | * | |
9301 | * If the user does a sysrq-z, then they can re-enable | |
9302 | * tracing with echo 1 > tracing_on. | |
9303 | */ | |
0ee6b6cf | 9304 | tracing_off(); |
cf586b61 | 9305 | |
7fe70b57 | 9306 | local_irq_save(flags); |
03fc7f9c | 9307 | printk_nmi_direct_enter(); |
3f5a54e3 | 9308 | |
38dbe0b1 | 9309 | /* Simulate the iterator */ |
955b61e5 | 9310 | trace_init_global_iter(&iter); |
8e99cf91 SRV |
9311 | /* Can not use kmalloc for iter.temp */ |
9312 | iter.temp = static_temp_buf; | |
9313 | iter.temp_size = STATIC_TEMP_BUF_SIZE; | |
955b61e5 | 9314 | |
d769041f | 9315 | for_each_tracing_cpu(cpu) { |
1c5eb448 | 9316 | atomic_inc(&per_cpu_ptr(iter.array_buffer->data, cpu)->disabled); |
d769041f SR |
9317 | } |
9318 | ||
983f938a | 9319 | old_userobj = tr->trace_flags & TRACE_ITER_SYM_USEROBJ; |
cf586b61 | 9320 | |
b54d3de9 | 9321 | /* don't look at user memory in panic mode */ |
983f938a | 9322 | tr->trace_flags &= ~TRACE_ITER_SYM_USEROBJ; |
b54d3de9 | 9323 | |
cecbca96 FW |
9324 | switch (oops_dump_mode) { |
9325 | case DUMP_ALL: | |
ae3b5093 | 9326 | iter.cpu_file = RING_BUFFER_ALL_CPUS; |
cecbca96 FW |
9327 | break; |
9328 | case DUMP_ORIG: | |
9329 | iter.cpu_file = raw_smp_processor_id(); | |
9330 | break; | |
9331 | case DUMP_NONE: | |
9332 | goto out_enable; | |
9333 | default: | |
9334 | printk(KERN_TRACE "Bad dumping mode, switching to all CPUs dump\n"); | |
ae3b5093 | 9335 | iter.cpu_file = RING_BUFFER_ALL_CPUS; |
cecbca96 FW |
9336 | } |
9337 | ||
9338 | printk(KERN_TRACE "Dumping ftrace buffer:\n"); | |
3f5a54e3 | 9339 | |
7fe70b57 SRRH |
9340 | /* Did function tracer already get disabled? */ |
9341 | if (ftrace_is_dead()) { | |
9342 | printk("# WARNING: FUNCTION TRACING IS CORRUPTED\n"); | |
9343 | printk("# MAY BE MISSING FUNCTION EVENTS\n"); | |
9344 | } | |
9345 | ||
3f5a54e3 | 9346 | /* |
5c8c206e | 9347 | * We need to stop all tracing on all CPUS to read |
3f5a54e3 SR |
9348 | * the next buffer. This is a bit expensive, but is |
9349 | * not done often. We fill all what we can read, | |
9350 | * and then release the locks again. | |
9351 | */ | |
9352 | ||
3f5a54e3 SR |
9353 | while (!trace_empty(&iter)) { |
9354 | ||
9355 | if (!cnt) | |
9356 | printk(KERN_TRACE "---------------------------------\n"); | |
9357 | ||
9358 | cnt++; | |
9359 | ||
0c97bf86 | 9360 | trace_iterator_reset(&iter); |
3f5a54e3 | 9361 | iter.iter_flags |= TRACE_FILE_LAT_FMT; |
3f5a54e3 | 9362 | |
955b61e5 | 9363 | if (trace_find_next_entry_inc(&iter) != NULL) { |
74e7ff8c LJ |
9364 | int ret; |
9365 | ||
9366 | ret = print_trace_line(&iter); | |
9367 | if (ret != TRACE_TYPE_NO_CONSUME) | |
9368 | trace_consume(&iter); | |
3f5a54e3 | 9369 | } |
b892e5c8 | 9370 | touch_nmi_watchdog(); |
3f5a54e3 SR |
9371 | |
9372 | trace_printk_seq(&iter.seq); | |
9373 | } | |
9374 | ||
9375 | if (!cnt) | |
9376 | printk(KERN_TRACE " (ftrace buffer empty)\n"); | |
9377 | else | |
9378 | printk(KERN_TRACE "---------------------------------\n"); | |
9379 | ||
cecbca96 | 9380 | out_enable: |
983f938a | 9381 | tr->trace_flags |= old_userobj; |
cf586b61 | 9382 | |
7fe70b57 | 9383 | for_each_tracing_cpu(cpu) { |
1c5eb448 | 9384 | atomic_dec(&per_cpu_ptr(iter.array_buffer->data, cpu)->disabled); |
cf586b61 | 9385 | } |
03fc7f9c PM |
9386 | atomic_dec(&dump_running); |
9387 | printk_nmi_direct_exit(); | |
cd891ae0 | 9388 | local_irq_restore(flags); |
3f5a54e3 | 9389 | } |
a8eecf22 | 9390 | EXPORT_SYMBOL_GPL(ftrace_dump); |
cf586b61 | 9391 | |
7e465baa TZ |
9392 | int trace_run_command(const char *buf, int (*createfn)(int, char **)) |
9393 | { | |
9394 | char **argv; | |
9395 | int argc, ret; | |
9396 | ||
9397 | argc = 0; | |
9398 | ret = 0; | |
9399 | argv = argv_split(GFP_KERNEL, buf, &argc); | |
9400 | if (!argv) | |
9401 | return -ENOMEM; | |
9402 | ||
9403 | if (argc) | |
9404 | ret = createfn(argc, argv); | |
9405 | ||
9406 | argv_free(argv); | |
9407 | ||
9408 | return ret; | |
9409 | } | |
9410 | ||
9411 | #define WRITE_BUFSIZE 4096 | |
9412 | ||
9413 | ssize_t trace_parse_run_command(struct file *file, const char __user *buffer, | |
9414 | size_t count, loff_t *ppos, | |
9415 | int (*createfn)(int, char **)) | |
9416 | { | |
9417 | char *kbuf, *buf, *tmp; | |
9418 | int ret = 0; | |
9419 | size_t done = 0; | |
9420 | size_t size; | |
9421 | ||
9422 | kbuf = kmalloc(WRITE_BUFSIZE, GFP_KERNEL); | |
9423 | if (!kbuf) | |
9424 | return -ENOMEM; | |
9425 | ||
9426 | while (done < count) { | |
9427 | size = count - done; | |
9428 | ||
9429 | if (size >= WRITE_BUFSIZE) | |
9430 | size = WRITE_BUFSIZE - 1; | |
9431 | ||
9432 | if (copy_from_user(kbuf, buffer + done, size)) { | |
9433 | ret = -EFAULT; | |
9434 | goto out; | |
9435 | } | |
9436 | kbuf[size] = '\0'; | |
9437 | buf = kbuf; | |
9438 | do { | |
9439 | tmp = strchr(buf, '\n'); | |
9440 | if (tmp) { | |
9441 | *tmp = '\0'; | |
9442 | size = tmp - buf + 1; | |
9443 | } else { | |
9444 | size = strlen(buf); | |
9445 | if (done + size < count) { | |
9446 | if (buf != kbuf) | |
9447 | break; | |
9448 | /* This can accept WRITE_BUFSIZE - 2 ('\n' + '\0') */ | |
9449 | pr_warn("Line length is too long: Should be less than %d\n", | |
9450 | WRITE_BUFSIZE - 2); | |
9451 | ret = -EINVAL; | |
9452 | goto out; | |
9453 | } | |
9454 | } | |
9455 | done += size; | |
9456 | ||
9457 | /* Remove comments */ | |
9458 | tmp = strchr(buf, '#'); | |
9459 | ||
9460 | if (tmp) | |
9461 | *tmp = '\0'; | |
9462 | ||
9463 | ret = trace_run_command(buf, createfn); | |
9464 | if (ret) | |
9465 | goto out; | |
9466 | buf += size; | |
9467 | ||
9468 | } while (done < count); | |
9469 | } | |
9470 | ret = done; | |
9471 | ||
9472 | out: | |
9473 | kfree(kbuf); | |
9474 | ||
9475 | return ret; | |
9476 | } | |
9477 | ||
3928a8a2 | 9478 | __init static int tracer_alloc_buffers(void) |
bc0c38d1 | 9479 | { |
73c5162a | 9480 | int ring_buf_size; |
9e01c1b7 | 9481 | int ret = -ENOMEM; |
4c11d7ae | 9482 | |
a356646a SRV |
9483 | |
9484 | if (security_locked_down(LOCKDOWN_TRACEFS)) { | |
ee195452 | 9485 | pr_warn("Tracing disabled due to lockdown\n"); |
a356646a SRV |
9486 | return -EPERM; |
9487 | } | |
9488 | ||
b5e87c05 | 9489 | /* |
499f7bb0 | 9490 | * Make sure we don't accidentally add more trace options |
b5e87c05 SRRH |
9491 | * than we have bits for. |
9492 | */ | |
9a38a885 | 9493 | BUILD_BUG_ON(TRACE_ITER_LAST_BIT > TRACE_FLAGS_MAX_SIZE); |
b5e87c05 | 9494 | |
9e01c1b7 RR |
9495 | if (!alloc_cpumask_var(&tracing_buffer_mask, GFP_KERNEL)) |
9496 | goto out; | |
9497 | ||
ccfe9e42 | 9498 | if (!alloc_cpumask_var(&global_trace.tracing_cpumask, GFP_KERNEL)) |
9e01c1b7 | 9499 | goto out_free_buffer_mask; |
4c11d7ae | 9500 | |
07d777fe | 9501 | /* Only allocate trace_printk buffers if a trace_printk exists */ |
bf2cbe04 | 9502 | if (&__stop___trace_bprintk_fmt != &__start___trace_bprintk_fmt) |
81698831 | 9503 | /* Must be called before global_trace.buffer is allocated */ |
07d777fe SR |
9504 | trace_printk_init_buffers(); |
9505 | ||
73c5162a SR |
9506 | /* To save memory, keep the ring buffer size to its minimum */ |
9507 | if (ring_buffer_expanded) | |
9508 | ring_buf_size = trace_buf_size; | |
9509 | else | |
9510 | ring_buf_size = 1; | |
9511 | ||
9e01c1b7 | 9512 | cpumask_copy(tracing_buffer_mask, cpu_possible_mask); |
ccfe9e42 | 9513 | cpumask_copy(global_trace.tracing_cpumask, cpu_all_mask); |
9e01c1b7 | 9514 | |
2b6080f2 SR |
9515 | raw_spin_lock_init(&global_trace.start_lock); |
9516 | ||
b32614c0 SAS |
9517 | /* |
9518 | * The prepare callbacks allocates some memory for the ring buffer. We | |
499f7bb0 | 9519 | * don't free the buffer if the CPU goes down. If we were to free |
b32614c0 SAS |
9520 | * the buffer, then the user would lose any trace that was in the |
9521 | * buffer. The memory will be removed once the "instance" is removed. | |
9522 | */ | |
9523 | ret = cpuhp_setup_state_multi(CPUHP_TRACE_RB_PREPARE, | |
9524 | "trace/RB:preapre", trace_rb_cpu_prepare, | |
9525 | NULL); | |
9526 | if (ret < 0) | |
9527 | goto out_free_cpumask; | |
2c4a33ab | 9528 | /* Used for event triggers */ |
147d88e0 | 9529 | ret = -ENOMEM; |
2c4a33ab SRRH |
9530 | temp_buffer = ring_buffer_alloc(PAGE_SIZE, RB_FL_OVERWRITE); |
9531 | if (!temp_buffer) | |
b32614c0 | 9532 | goto out_rm_hp_state; |
2c4a33ab | 9533 | |
939c7a4f YY |
9534 | if (trace_create_savedcmd() < 0) |
9535 | goto out_free_temp_buffer; | |
9536 | ||
9e01c1b7 | 9537 | /* TODO: make the number of buffers hot pluggable with CPUS */ |
737223fb | 9538 | if (allocate_trace_buffers(&global_trace, ring_buf_size) < 0) { |
24589e3a | 9539 | MEM_FAIL(1, "tracer: failed to allocate ring buffer!\n"); |
939c7a4f | 9540 | goto out_free_savedcmd; |
4c11d7ae | 9541 | } |
a7603ff4 | 9542 | |
499e5470 SR |
9543 | if (global_trace.buffer_disabled) |
9544 | tracing_off(); | |
4c11d7ae | 9545 | |
e1e232ca SR |
9546 | if (trace_boot_clock) { |
9547 | ret = tracing_set_clock(&global_trace, trace_boot_clock); | |
9548 | if (ret < 0) | |
a395d6a7 JP |
9549 | pr_warn("Trace clock %s not defined, going back to default\n", |
9550 | trace_boot_clock); | |
e1e232ca SR |
9551 | } |
9552 | ||
ca164318 SRRH |
9553 | /* |
9554 | * register_tracer() might reference current_trace, so it | |
9555 | * needs to be set before we register anything. This is | |
9556 | * just a bootstrap of current_trace anyway. | |
9557 | */ | |
2b6080f2 SR |
9558 | global_trace.current_trace = &nop_trace; |
9559 | ||
0b9b12c1 SRRH |
9560 | global_trace.max_lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED; |
9561 | ||
4104d326 SRRH |
9562 | ftrace_init_global_array_ops(&global_trace); |
9563 | ||
9a38a885 SRRH |
9564 | init_trace_flags_index(&global_trace); |
9565 | ||
ca164318 SRRH |
9566 | register_tracer(&nop_trace); |
9567 | ||
dbeafd0d SRV |
9568 | /* Function tracing may start here (via kernel command line) */ |
9569 | init_function_trace(); | |
9570 | ||
60a11774 SR |
9571 | /* All seems OK, enable tracing */ |
9572 | tracing_disabled = 0; | |
3928a8a2 | 9573 | |
3f5a54e3 SR |
9574 | atomic_notifier_chain_register(&panic_notifier_list, |
9575 | &trace_panic_notifier); | |
9576 | ||
9577 | register_die_notifier(&trace_die_notifier); | |
2fc1dfbe | 9578 | |
ae63b31e SR |
9579 | global_trace.flags = TRACE_ARRAY_FL_GLOBAL; |
9580 | ||
9581 | INIT_LIST_HEAD(&global_trace.systems); | |
9582 | INIT_LIST_HEAD(&global_trace.events); | |
067fe038 | 9583 | INIT_LIST_HEAD(&global_trace.hist_vars); |
2f754e77 | 9584 | INIT_LIST_HEAD(&global_trace.err_log); |
ae63b31e SR |
9585 | list_add(&global_trace.list, &ftrace_trace_arrays); |
9586 | ||
a4d1e688 | 9587 | apply_trace_boot_options(); |
7bcfaf54 | 9588 | |
77fd5c15 SRRH |
9589 | register_snapshot_cmd(); |
9590 | ||
2fc1dfbe | 9591 | return 0; |
3f5a54e3 | 9592 | |
939c7a4f YY |
9593 | out_free_savedcmd: |
9594 | free_saved_cmdlines_buffer(savedcmd); | |
2c4a33ab SRRH |
9595 | out_free_temp_buffer: |
9596 | ring_buffer_free(temp_buffer); | |
b32614c0 SAS |
9597 | out_rm_hp_state: |
9598 | cpuhp_remove_multi_state(CPUHP_TRACE_RB_PREPARE); | |
9e01c1b7 | 9599 | out_free_cpumask: |
ccfe9e42 | 9600 | free_cpumask_var(global_trace.tracing_cpumask); |
9e01c1b7 RR |
9601 | out_free_buffer_mask: |
9602 | free_cpumask_var(tracing_buffer_mask); | |
9603 | out: | |
9604 | return ret; | |
bc0c38d1 | 9605 | } |
b2821ae6 | 9606 | |
e725c731 | 9607 | void __init early_trace_init(void) |
5f893b26 | 9608 | { |
0daa2302 SRRH |
9609 | if (tracepoint_printk) { |
9610 | tracepoint_print_iter = | |
9611 | kmalloc(sizeof(*tracepoint_print_iter), GFP_KERNEL); | |
24589e3a SRV |
9612 | if (MEM_FAIL(!tracepoint_print_iter, |
9613 | "Failed to allocate trace iterator\n")) | |
0daa2302 | 9614 | tracepoint_printk = 0; |
42391745 SRRH |
9615 | else |
9616 | static_key_enable(&tracepoint_printk_key.key); | |
0daa2302 | 9617 | } |
5f893b26 | 9618 | tracer_alloc_buffers(); |
e725c731 SRV |
9619 | } |
9620 | ||
9621 | void __init trace_init(void) | |
9622 | { | |
0c564a53 | 9623 | trace_event_init(); |
5f893b26 SRRH |
9624 | } |
9625 | ||
b2821ae6 SR |
9626 | __init static int clear_boot_tracer(void) |
9627 | { | |
9628 | /* | |
9629 | * The default tracer at boot buffer is an init section. | |
9630 | * This function is called in lateinit. If we did not | |
9631 | * find the boot tracer, then clear it out, to prevent | |
9632 | * later registration from accessing the buffer that is | |
9633 | * about to be freed. | |
9634 | */ | |
9635 | if (!default_bootup_tracer) | |
9636 | return 0; | |
9637 | ||
9638 | printk(KERN_INFO "ftrace bootup tracer '%s' not registered.\n", | |
9639 | default_bootup_tracer); | |
9640 | default_bootup_tracer = NULL; | |
9641 | ||
9642 | return 0; | |
9643 | } | |
9644 | ||
8434dc93 | 9645 | fs_initcall(tracer_init_tracefs); |
4bb0f0e7 | 9646 | late_initcall_sync(clear_boot_tracer); |
3fd49c9e CW |
9647 | |
9648 | #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK | |
9649 | __init static int tracing_set_default_clock(void) | |
9650 | { | |
9651 | /* sched_clock_stable() is determined in late_initcall */ | |
5125eee4 | 9652 | if (!trace_boot_clock && !sched_clock_stable()) { |
bf24daac MI |
9653 | if (security_locked_down(LOCKDOWN_TRACEFS)) { |
9654 | pr_warn("Can not set tracing clock due to lockdown\n"); | |
9655 | return -EPERM; | |
9656 | } | |
9657 | ||
3fd49c9e CW |
9658 | printk(KERN_WARNING |
9659 | "Unstable clock detected, switching default tracing clock to \"global\"\n" | |
9660 | "If you want to keep using the local clock, then add:\n" | |
9661 | " \"trace_clock=local\"\n" | |
9662 | "on the kernel command line\n"); | |
9663 | tracing_set_clock(&global_trace, "global"); | |
9664 | } | |
9665 | ||
9666 | return 0; | |
9667 | } | |
9668 | late_initcall_sync(tracing_set_default_clock); | |
9669 | #endif |