Commit | Line | Data |
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bc0c38d1 SR |
1 | /* |
2 | * ring buffer based function tracer | |
3 | * | |
2b6080f2 | 4 | * Copyright (C) 2007-2012 Steven Rostedt <srostedt@redhat.com> |
bc0c38d1 SR |
5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> |
6 | * | |
7 | * Originally taken from the RT patch by: | |
8 | * Arnaldo Carvalho de Melo <acme@redhat.com> | |
9 | * | |
10 | * Based on code from the latency_tracer, that is: | |
11 | * Copyright (C) 2004-2006 Ingo Molnar | |
6d49e352 | 12 | * Copyright (C) 2004 Nadia Yvette Chambers |
bc0c38d1 | 13 | */ |
2cadf913 | 14 | #include <linux/ring_buffer.h> |
273b281f | 15 | #include <generated/utsrelease.h> |
2cadf913 SR |
16 | #include <linux/stacktrace.h> |
17 | #include <linux/writeback.h> | |
bc0c38d1 SR |
18 | #include <linux/kallsyms.h> |
19 | #include <linux/seq_file.h> | |
3f5a54e3 | 20 | #include <linux/notifier.h> |
2cadf913 | 21 | #include <linux/irqflags.h> |
bc0c38d1 | 22 | #include <linux/debugfs.h> |
4c11d7ae | 23 | #include <linux/pagemap.h> |
bc0c38d1 SR |
24 | #include <linux/hardirq.h> |
25 | #include <linux/linkage.h> | |
26 | #include <linux/uaccess.h> | |
2cadf913 | 27 | #include <linux/kprobes.h> |
bc0c38d1 SR |
28 | #include <linux/ftrace.h> |
29 | #include <linux/module.h> | |
30 | #include <linux/percpu.h> | |
2cadf913 | 31 | #include <linux/splice.h> |
3f5a54e3 | 32 | #include <linux/kdebug.h> |
5f0c6c03 | 33 | #include <linux/string.h> |
7e53bd42 | 34 | #include <linux/rwsem.h> |
5a0e3ad6 | 35 | #include <linux/slab.h> |
bc0c38d1 SR |
36 | #include <linux/ctype.h> |
37 | #include <linux/init.h> | |
2a2cc8f7 | 38 | #include <linux/poll.h> |
b892e5c8 | 39 | #include <linux/nmi.h> |
bc0c38d1 | 40 | #include <linux/fs.h> |
6fa3eb70 | 41 | |
8bd75c77 | 42 | #include <linux/sched/rt.h> |
86387f7e | 43 | |
bc0c38d1 | 44 | #include "trace.h" |
f0868d1e | 45 | #include "trace_output.h" |
bc0c38d1 | 46 | |
6fa3eb70 S |
47 | #ifdef CONFIG_MTK_SCHED_TRACERS |
48 | #include <linux/mtk_ftrace.h> | |
49 | #define CREATE_TRACE_POINTS | |
50 | #include <trace/events/mtk_events.h> | |
51 | EXPORT_TRACEPOINT_SYMBOL(gpu_freq); | |
52 | #endif | |
53 | ||
54 | #ifdef CONFIG_MTK_EXTMEM | |
55 | #include <linux/vmalloc.h> | |
56 | #endif | |
57 | ||
73c5162a SR |
58 | /* |
59 | * On boot up, the ring buffer is set to the minimum size, so that | |
60 | * we do not waste memory on systems that are not using tracing. | |
61 | */ | |
55034cd6 | 62 | bool ring_buffer_expanded; |
73c5162a | 63 | |
8e1b82e0 FW |
64 | /* |
65 | * We need to change this state when a selftest is running. | |
ff32504f FW |
66 | * A selftest will lurk into the ring-buffer to count the |
67 | * entries inserted during the selftest although some concurrent | |
5e1607a0 | 68 | * insertions into the ring-buffer such as trace_printk could occurred |
ff32504f FW |
69 | * at the same time, giving false positive or negative results. |
70 | */ | |
8e1b82e0 | 71 | static bool __read_mostly tracing_selftest_running; |
ff32504f | 72 | |
b2821ae6 SR |
73 | /* |
74 | * If a tracer is running, we do not want to run SELFTEST. | |
75 | */ | |
020e5f85 | 76 | bool __read_mostly tracing_selftest_disabled; |
b2821ae6 | 77 | |
adf9f195 FW |
78 | /* For tracers that don't implement custom flags */ |
79 | static struct tracer_opt dummy_tracer_opt[] = { | |
80 | { } | |
81 | }; | |
82 | ||
83 | static struct tracer_flags dummy_tracer_flags = { | |
84 | .val = 0, | |
85 | .opts = dummy_tracer_opt | |
86 | }; | |
87 | ||
88 | static int dummy_set_flag(u32 old_flags, u32 bit, int set) | |
89 | { | |
90 | return 0; | |
91 | } | |
0f048701 | 92 | |
7ffbd48d SR |
93 | /* |
94 | * To prevent the comm cache from being overwritten when no | |
95 | * tracing is active, only save the comm when a trace event | |
96 | * occurred. | |
97 | */ | |
98 | static DEFINE_PER_CPU(bool, trace_cmdline_save); | |
99 | ||
0f048701 SR |
100 | /* |
101 | * Kill all tracing for good (never come back). | |
102 | * It is initialized to 1 but will turn to zero if the initialization | |
103 | * of the tracer is successful. But that is the only place that sets | |
104 | * this back to zero. | |
105 | */ | |
4fd27358 | 106 | static int tracing_disabled = 1; |
0f048701 | 107 | |
9288f99a | 108 | DEFINE_PER_CPU(int, ftrace_cpu_disabled); |
d769041f | 109 | |
955b61e5 | 110 | cpumask_var_t __read_mostly tracing_buffer_mask; |
ab46428c | 111 | |
944ac425 SR |
112 | /* |
113 | * ftrace_dump_on_oops - variable to dump ftrace buffer on oops | |
114 | * | |
115 | * If there is an oops (or kernel panic) and the ftrace_dump_on_oops | |
116 | * is set, then ftrace_dump is called. This will output the contents | |
117 | * of the ftrace buffers to the console. This is very useful for | |
118 | * capturing traces that lead to crashes and outputing it to a | |
119 | * serial console. | |
120 | * | |
121 | * It is default off, but you can enable it with either specifying | |
122 | * "ftrace_dump_on_oops" in the kernel command line, or setting | |
cecbca96 FW |
123 | * /proc/sys/kernel/ftrace_dump_on_oops |
124 | * Set 1 if you want to dump buffers of all CPUs | |
125 | * Set 2 if you want to dump the buffer of the CPU that triggered oops | |
944ac425 | 126 | */ |
cecbca96 FW |
127 | |
128 | enum ftrace_dump_mode ftrace_dump_on_oops; | |
944ac425 | 129 | |
b2821ae6 SR |
130 | static int tracing_set_tracer(const char *buf); |
131 | ||
ee6c2c1b LZ |
132 | #define MAX_TRACER_SIZE 100 |
133 | static char bootup_tracer_buf[MAX_TRACER_SIZE] __initdata; | |
b2821ae6 | 134 | static char *default_bootup_tracer; |
d9e54076 | 135 | |
55034cd6 SRRH |
136 | static bool allocate_snapshot; |
137 | ||
1beee96b | 138 | static int __init set_cmdline_ftrace(char *str) |
d9e54076 | 139 | { |
67012ab1 | 140 | strlcpy(bootup_tracer_buf, str, MAX_TRACER_SIZE); |
b2821ae6 | 141 | default_bootup_tracer = bootup_tracer_buf; |
73c5162a | 142 | /* We are using ftrace early, expand it */ |
55034cd6 | 143 | ring_buffer_expanded = true; |
d9e54076 PZ |
144 | return 1; |
145 | } | |
1beee96b | 146 | __setup("ftrace=", set_cmdline_ftrace); |
d9e54076 | 147 | |
944ac425 SR |
148 | static int __init set_ftrace_dump_on_oops(char *str) |
149 | { | |
cecbca96 FW |
150 | if (*str++ != '=' || !*str) { |
151 | ftrace_dump_on_oops = DUMP_ALL; | |
152 | return 1; | |
153 | } | |
154 | ||
155 | if (!strcmp("orig_cpu", str)) { | |
156 | ftrace_dump_on_oops = DUMP_ORIG; | |
157 | return 1; | |
158 | } | |
159 | ||
160 | return 0; | |
944ac425 SR |
161 | } |
162 | __setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops); | |
60a11774 | 163 | |
3209cff4 | 164 | static int __init boot_alloc_snapshot(char *str) |
55034cd6 SRRH |
165 | { |
166 | allocate_snapshot = true; | |
167 | /* We also need the main ring buffer expanded */ | |
168 | ring_buffer_expanded = true; | |
169 | return 1; | |
170 | } | |
3209cff4 | 171 | __setup("alloc_snapshot", boot_alloc_snapshot); |
55034cd6 | 172 | |
7bcfaf54 SR |
173 | |
174 | static char trace_boot_options_buf[MAX_TRACER_SIZE] __initdata; | |
175 | static char *trace_boot_options __initdata; | |
176 | ||
177 | static int __init set_trace_boot_options(char *str) | |
178 | { | |
67012ab1 | 179 | strlcpy(trace_boot_options_buf, str, MAX_TRACER_SIZE); |
7bcfaf54 SR |
180 | trace_boot_options = trace_boot_options_buf; |
181 | return 0; | |
182 | } | |
183 | __setup("trace_options=", set_trace_boot_options); | |
184 | ||
cf8e3474 | 185 | unsigned long long ns2usecs(cycle_t nsec) |
bc0c38d1 SR |
186 | { |
187 | nsec += 500; | |
188 | do_div(nsec, 1000); | |
189 | return nsec; | |
190 | } | |
191 | ||
4fcdae83 SR |
192 | /* |
193 | * The global_trace is the descriptor that holds the tracing | |
194 | * buffers for the live tracing. For each CPU, it contains | |
195 | * a link list of pages that will store trace entries. The | |
196 | * page descriptor of the pages in the memory is used to hold | |
197 | * the link list by linking the lru item in the page descriptor | |
198 | * to each of the pages in the buffer per CPU. | |
199 | * | |
200 | * For each active CPU there is a data field that holds the | |
201 | * pages for the buffer for that CPU. Each CPU has the same number | |
202 | * of pages allocated for its buffer. | |
203 | */ | |
bc0c38d1 SR |
204 | static struct trace_array global_trace; |
205 | ||
ae63b31e | 206 | LIST_HEAD(ftrace_trace_arrays); |
bc0c38d1 | 207 | |
59d8f488 SRRH |
208 | int trace_array_get(struct trace_array *this_tr) |
209 | { | |
210 | struct trace_array *tr; | |
211 | int ret = -ENODEV; | |
212 | ||
213 | mutex_lock(&trace_types_lock); | |
214 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
215 | if (tr == this_tr) { | |
216 | tr->ref++; | |
217 | ret = 0; | |
218 | break; | |
219 | } | |
220 | } | |
221 | mutex_unlock(&trace_types_lock); | |
222 | ||
223 | return ret; | |
224 | } | |
225 | ||
226 | static void __trace_array_put(struct trace_array *this_tr) | |
227 | { | |
228 | WARN_ON(!this_tr->ref); | |
229 | this_tr->ref--; | |
230 | } | |
231 | ||
232 | void trace_array_put(struct trace_array *this_tr) | |
233 | { | |
234 | mutex_lock(&trace_types_lock); | |
235 | __trace_array_put(this_tr); | |
236 | mutex_unlock(&trace_types_lock); | |
237 | } | |
238 | ||
e77405ad SR |
239 | int filter_current_check_discard(struct ring_buffer *buffer, |
240 | struct ftrace_event_call *call, void *rec, | |
eb02ce01 TZ |
241 | struct ring_buffer_event *event) |
242 | { | |
e77405ad | 243 | return filter_check_discard(call, rec, buffer, event); |
eb02ce01 | 244 | } |
17c873ec | 245 | EXPORT_SYMBOL_GPL(filter_current_check_discard); |
eb02ce01 | 246 | |
e88512e7 | 247 | cycle_t buffer_ftrace_now(struct trace_buffer *buf, int cpu) |
37886f6a SR |
248 | { |
249 | u64 ts; | |
250 | ||
251 | /* Early boot up does not have a buffer yet */ | |
e88512e7 | 252 | if (!buf->buffer) |
37886f6a SR |
253 | return trace_clock_local(); |
254 | ||
e88512e7 AL |
255 | ts = ring_buffer_time_stamp(buf->buffer, cpu); |
256 | ring_buffer_normalize_time_stamp(buf->buffer, cpu, &ts); | |
37886f6a SR |
257 | |
258 | return ts; | |
259 | } | |
bc0c38d1 | 260 | |
e88512e7 AL |
261 | cycle_t ftrace_now(int cpu) |
262 | { | |
263 | return buffer_ftrace_now(&global_trace.trace_buffer, cpu); | |
264 | } | |
265 | ||
2fd821ee SRRH |
266 | /** |
267 | * tracing_is_enabled - Show if global_trace has been disabled | |
268 | * | |
269 | * Shows if the global trace has been enabled or not. It uses the | |
270 | * mirror flag "buffer_disabled" to be used in fast paths such as for | |
271 | * the irqsoff tracer. But it may be inaccurate due to races. If you | |
272 | * need to know the accurate state, use tracing_is_on() which is a little | |
273 | * slower, but accurate. | |
274 | */ | |
9036990d SR |
275 | int tracing_is_enabled(void) |
276 | { | |
2fd821ee SRRH |
277 | /* |
278 | * For quick access (irqsoff uses this in fast path), just | |
279 | * return the mirror variable of the state of the ring buffer. | |
280 | * It's a little racy, but we don't really care. | |
281 | */ | |
282 | smp_rmb(); | |
283 | return !global_trace.buffer_disabled; | |
9036990d SR |
284 | } |
285 | ||
4fcdae83 | 286 | /* |
3928a8a2 SR |
287 | * trace_buf_size is the size in bytes that is allocated |
288 | * for a buffer. Note, the number of bytes is always rounded | |
289 | * to page size. | |
3f5a54e3 SR |
290 | * |
291 | * This number is purposely set to a low number of 16384. | |
292 | * If the dump on oops happens, it will be much appreciated | |
293 | * to not have to wait for all that output. Anyway this can be | |
294 | * boot time and run time configurable. | |
4fcdae83 | 295 | */ |
3928a8a2 | 296 | #define TRACE_BUF_SIZE_DEFAULT 1441792UL /* 16384 * 88 (sizeof(entry)) */ |
3f5a54e3 | 297 | |
3928a8a2 | 298 | static unsigned long trace_buf_size = TRACE_BUF_SIZE_DEFAULT; |
bc0c38d1 | 299 | |
6fa3eb70 S |
300 | #ifdef CONFIG_MTK_SCHED_TRACERS |
301 | #define CPUX_TRACE_BUF_SIZE_DEFAULT 4194304UL | |
302 | #define CPU0_to_CPUX_RATIO (1.2) | |
303 | extern unsigned int get_max_DRAM_size (void); | |
304 | static unsigned long trace_buf_size_cpu0 = (CPUX_TRACE_BUF_SIZE_DEFAULT * CPU0_to_CPUX_RATIO); | |
305 | static unsigned long trace_buf_size_cpuX = CPUX_TRACE_BUF_SIZE_DEFAULT; | |
306 | static unsigned int trace_buf_size_updated_from_cmdline = 0; | |
307 | #endif | |
308 | ||
4fcdae83 | 309 | /* trace_types holds a link list of available tracers. */ |
bc0c38d1 | 310 | static struct tracer *trace_types __read_mostly; |
4fcdae83 | 311 | |
4fcdae83 SR |
312 | /* |
313 | * trace_types_lock is used to protect the trace_types list. | |
4fcdae83 | 314 | */ |
9713f785 | 315 | DEFINE_MUTEX(trace_types_lock); |
4fcdae83 | 316 | |
7e53bd42 LJ |
317 | /* |
318 | * serialize the access of the ring buffer | |
319 | * | |
320 | * ring buffer serializes readers, but it is low level protection. | |
321 | * The validity of the events (which returns by ring_buffer_peek() ..etc) | |
322 | * are not protected by ring buffer. | |
323 | * | |
324 | * The content of events may become garbage if we allow other process consumes | |
325 | * these events concurrently: | |
326 | * A) the page of the consumed events may become a normal page | |
327 | * (not reader page) in ring buffer, and this page will be rewrited | |
328 | * by events producer. | |
329 | * B) The page of the consumed events may become a page for splice_read, | |
330 | * and this page will be returned to system. | |
331 | * | |
332 | * These primitives allow multi process access to different cpu ring buffer | |
333 | * concurrently. | |
334 | * | |
335 | * These primitives don't distinguish read-only and read-consume access. | |
336 | * Multi read-only access are also serialized. | |
337 | */ | |
338 | ||
339 | #ifdef CONFIG_SMP | |
340 | static DECLARE_RWSEM(all_cpu_access_lock); | |
341 | static DEFINE_PER_CPU(struct mutex, cpu_access_lock); | |
342 | ||
343 | static inline void trace_access_lock(int cpu) | |
344 | { | |
ae3b5093 | 345 | if (cpu == RING_BUFFER_ALL_CPUS) { |
7e53bd42 LJ |
346 | /* gain it for accessing the whole ring buffer. */ |
347 | down_write(&all_cpu_access_lock); | |
348 | } else { | |
349 | /* gain it for accessing a cpu ring buffer. */ | |
350 | ||
ae3b5093 | 351 | /* Firstly block other trace_access_lock(RING_BUFFER_ALL_CPUS). */ |
7e53bd42 LJ |
352 | down_read(&all_cpu_access_lock); |
353 | ||
354 | /* Secondly block other access to this @cpu ring buffer. */ | |
355 | mutex_lock(&per_cpu(cpu_access_lock, cpu)); | |
356 | } | |
357 | } | |
358 | ||
359 | static inline void trace_access_unlock(int cpu) | |
360 | { | |
ae3b5093 | 361 | if (cpu == RING_BUFFER_ALL_CPUS) { |
7e53bd42 LJ |
362 | up_write(&all_cpu_access_lock); |
363 | } else { | |
364 | mutex_unlock(&per_cpu(cpu_access_lock, cpu)); | |
365 | up_read(&all_cpu_access_lock); | |
366 | } | |
367 | } | |
368 | ||
369 | static inline void trace_access_lock_init(void) | |
370 | { | |
371 | int cpu; | |
372 | ||
373 | for_each_possible_cpu(cpu) | |
374 | mutex_init(&per_cpu(cpu_access_lock, cpu)); | |
375 | } | |
376 | ||
377 | #else | |
378 | ||
379 | static DEFINE_MUTEX(access_lock); | |
380 | ||
381 | static inline void trace_access_lock(int cpu) | |
382 | { | |
383 | (void)cpu; | |
384 | mutex_lock(&access_lock); | |
385 | } | |
386 | ||
387 | static inline void trace_access_unlock(int cpu) | |
388 | { | |
389 | (void)cpu; | |
390 | mutex_unlock(&access_lock); | |
391 | } | |
392 | ||
393 | static inline void trace_access_lock_init(void) | |
394 | { | |
395 | } | |
396 | ||
397 | #endif | |
398 | ||
ee6bce52 | 399 | /* trace_flags holds trace_options default values */ |
6fa3eb70 S |
400 | #ifdef CONFIG_MTK_FTRACE_DEFAULT_ENABLE |
401 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK | | |
402 | TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | TRACE_ITER_SLEEP_TIME | | |
403 | TRACE_ITER_GRAPH_TIME | TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS | | |
404 | TRACE_ITER_FUNCTION; | |
405 | #else | |
12ef7d44 | 406 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK | |
a2a16d6a | 407 | TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | TRACE_ITER_SLEEP_TIME | |
77271ce4 | 408 | TRACE_ITER_GRAPH_TIME | TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE | |
328df475 | 409 | TRACE_ITER_IRQ_INFO | TRACE_ITER_MARKERS | TRACE_ITER_FUNCTION; |
6fa3eb70 | 410 | #endif |
e7e2ee89 | 411 | |
2fd821ee SRRH |
412 | void tracer_tracing_on(struct trace_array *tr) |
413 | { | |
414 | if (tr->trace_buffer.buffer) | |
415 | ring_buffer_record_on(tr->trace_buffer.buffer); | |
416 | /* | |
417 | * This flag is looked at when buffers haven't been allocated | |
418 | * yet, or by some tracers (like irqsoff), that just want to | |
419 | * know if the ring buffer has been disabled, but it can handle | |
420 | * races of where it gets disabled but we still do a record. | |
421 | * As the check is in the fast path of the tracers, it is more | |
422 | * important to be fast than accurate. | |
423 | */ | |
424 | tr->buffer_disabled = 0; | |
425 | /* Make the flag seen by readers */ | |
426 | smp_wmb(); | |
427 | } | |
428 | ||
499e5470 SR |
429 | /** |
430 | * tracing_on - enable tracing buffers | |
431 | * | |
432 | * This function enables tracing buffers that may have been | |
433 | * disabled with tracing_off. | |
434 | */ | |
435 | void tracing_on(void) | |
436 | { | |
2fd821ee | 437 | tracer_tracing_on(&global_trace); |
6fa3eb70 S |
438 | #ifdef CONFIG_MTK_SCHED_TRACERS |
439 | trace_tracing_on(1, CALLER_ADDR0); | |
440 | #endif | |
499e5470 SR |
441 | } |
442 | EXPORT_SYMBOL_GPL(tracing_on); | |
443 | ||
09ae7234 SRRH |
444 | /** |
445 | * __trace_puts - write a constant string into the trace buffer. | |
446 | * @ip: The address of the caller | |
447 | * @str: The constant string to write | |
448 | * @size: The size of the string. | |
449 | */ | |
450 | int __trace_puts(unsigned long ip, const char *str, int size) | |
451 | { | |
452 | struct ring_buffer_event *event; | |
453 | struct ring_buffer *buffer; | |
454 | struct print_entry *entry; | |
455 | unsigned long irq_flags; | |
456 | int alloc; | |
e250100b J |
457 | int pc; |
458 | ||
459 | pc = preempt_count(); | |
09ae7234 | 460 | |
f74bb740 SRRH |
461 | if (unlikely(tracing_selftest_running || tracing_disabled)) |
462 | return 0; | |
463 | ||
09ae7234 SRRH |
464 | alloc = sizeof(*entry) + size + 2; /* possible \n added */ |
465 | ||
466 | local_save_flags(irq_flags); | |
467 | buffer = global_trace.trace_buffer.buffer; | |
468 | event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, alloc, | |
e250100b | 469 | irq_flags, pc); |
09ae7234 SRRH |
470 | if (!event) |
471 | return 0; | |
472 | ||
473 | entry = ring_buffer_event_data(event); | |
474 | entry->ip = ip; | |
475 | ||
476 | memcpy(&entry->buf, str, size); | |
477 | ||
478 | /* Add a newline if necessary */ | |
479 | if (entry->buf[size - 1] != '\n') { | |
480 | entry->buf[size] = '\n'; | |
481 | entry->buf[size + 1] = '\0'; | |
482 | } else | |
483 | entry->buf[size] = '\0'; | |
484 | ||
485 | __buffer_unlock_commit(buffer, event); | |
e250100b | 486 | ftrace_trace_stack(buffer, irq_flags, 4, pc); |
09ae7234 SRRH |
487 | |
488 | return size; | |
489 | } | |
490 | EXPORT_SYMBOL_GPL(__trace_puts); | |
491 | ||
492 | /** | |
493 | * __trace_bputs - write the pointer to a constant string into trace buffer | |
494 | * @ip: The address of the caller | |
495 | * @str: The constant string to write to the buffer to | |
496 | */ | |
497 | int __trace_bputs(unsigned long ip, const char *str) | |
498 | { | |
499 | struct ring_buffer_event *event; | |
500 | struct ring_buffer *buffer; | |
501 | struct bputs_entry *entry; | |
502 | unsigned long irq_flags; | |
503 | int size = sizeof(struct bputs_entry); | |
e250100b J |
504 | int pc; |
505 | ||
506 | pc = preempt_count(); | |
09ae7234 | 507 | |
f74bb740 SRRH |
508 | if (unlikely(tracing_selftest_running || tracing_disabled)) |
509 | return 0; | |
510 | ||
09ae7234 SRRH |
511 | local_save_flags(irq_flags); |
512 | buffer = global_trace.trace_buffer.buffer; | |
513 | event = trace_buffer_lock_reserve(buffer, TRACE_BPUTS, size, | |
e250100b | 514 | irq_flags, pc); |
09ae7234 SRRH |
515 | if (!event) |
516 | return 0; | |
517 | ||
518 | entry = ring_buffer_event_data(event); | |
519 | entry->ip = ip; | |
520 | entry->str = str; | |
521 | ||
522 | __buffer_unlock_commit(buffer, event); | |
e250100b | 523 | ftrace_trace_stack(buffer, irq_flags, 4, pc); |
09ae7234 SRRH |
524 | |
525 | return 1; | |
526 | } | |
527 | EXPORT_SYMBOL_GPL(__trace_bputs); | |
528 | ||
ad909e21 SRRH |
529 | #ifdef CONFIG_TRACER_SNAPSHOT |
530 | /** | |
531 | * trace_snapshot - take a snapshot of the current buffer. | |
532 | * | |
533 | * This causes a swap between the snapshot buffer and the current live | |
534 | * tracing buffer. You can use this to take snapshots of the live | |
535 | * trace when some condition is triggered, but continue to trace. | |
536 | * | |
537 | * Note, make sure to allocate the snapshot with either | |
538 | * a tracing_snapshot_alloc(), or by doing it manually | |
539 | * with: echo 1 > /sys/kernel/debug/tracing/snapshot | |
540 | * | |
541 | * If the snapshot buffer is not allocated, it will stop tracing. | |
542 | * Basically making a permanent snapshot. | |
543 | */ | |
544 | void tracing_snapshot(void) | |
545 | { | |
546 | struct trace_array *tr = &global_trace; | |
547 | struct tracer *tracer = tr->current_trace; | |
548 | unsigned long flags; | |
549 | ||
1b22e382 SRRH |
550 | if (in_nmi()) { |
551 | internal_trace_puts("*** SNAPSHOT CALLED FROM NMI CONTEXT ***\n"); | |
552 | internal_trace_puts("*** snapshot is being ignored ***\n"); | |
553 | return; | |
554 | } | |
555 | ||
ad909e21 | 556 | if (!tr->allocated_snapshot) { |
ca268da6 SRRH |
557 | internal_trace_puts("*** SNAPSHOT NOT ALLOCATED ***\n"); |
558 | internal_trace_puts("*** stopping trace here! ***\n"); | |
ad909e21 SRRH |
559 | tracing_off(); |
560 | return; | |
561 | } | |
562 | ||
563 | /* Note, snapshot can not be used when the tracer uses it */ | |
564 | if (tracer->use_max_tr) { | |
ca268da6 SRRH |
565 | internal_trace_puts("*** LATENCY TRACER ACTIVE ***\n"); |
566 | internal_trace_puts("*** Can not use snapshot (sorry) ***\n"); | |
ad909e21 SRRH |
567 | return; |
568 | } | |
569 | ||
570 | local_irq_save(flags); | |
571 | update_max_tr(tr, current, smp_processor_id()); | |
572 | local_irq_restore(flags); | |
573 | } | |
1b22e382 | 574 | EXPORT_SYMBOL_GPL(tracing_snapshot); |
ad909e21 SRRH |
575 | |
576 | static int resize_buffer_duplicate_size(struct trace_buffer *trace_buf, | |
577 | struct trace_buffer *size_buf, int cpu_id); | |
3209cff4 SRRH |
578 | static void set_buffer_entries(struct trace_buffer *buf, unsigned long val); |
579 | ||
580 | static int alloc_snapshot(struct trace_array *tr) | |
581 | { | |
582 | int ret; | |
583 | ||
584 | if (!tr->allocated_snapshot) { | |
585 | ||
586 | /* allocate spare buffer */ | |
587 | ret = resize_buffer_duplicate_size(&tr->max_buffer, | |
588 | &tr->trace_buffer, RING_BUFFER_ALL_CPUS); | |
589 | if (ret < 0) | |
590 | return ret; | |
591 | ||
592 | tr->allocated_snapshot = true; | |
593 | } | |
594 | ||
595 | return 0; | |
596 | } | |
597 | ||
598 | void free_snapshot(struct trace_array *tr) | |
599 | { | |
600 | /* | |
601 | * We don't free the ring buffer. instead, resize it because | |
602 | * The max_tr ring buffer has some state (e.g. ring->clock) and | |
603 | * we want preserve it. | |
604 | */ | |
605 | ring_buffer_resize(tr->max_buffer.buffer, 1, RING_BUFFER_ALL_CPUS); | |
606 | set_buffer_entries(&tr->max_buffer, 1); | |
607 | tracing_reset_online_cpus(&tr->max_buffer); | |
608 | tr->allocated_snapshot = false; | |
609 | } | |
ad909e21 SRRH |
610 | |
611 | /** | |
612 | * trace_snapshot_alloc - allocate and take a snapshot of the current buffer. | |
613 | * | |
614 | * This is similar to trace_snapshot(), but it will allocate the | |
615 | * snapshot buffer if it isn't already allocated. Use this only | |
616 | * where it is safe to sleep, as the allocation may sleep. | |
617 | * | |
618 | * This causes a swap between the snapshot buffer and the current live | |
619 | * tracing buffer. You can use this to take snapshots of the live | |
620 | * trace when some condition is triggered, but continue to trace. | |
621 | */ | |
622 | void tracing_snapshot_alloc(void) | |
623 | { | |
624 | struct trace_array *tr = &global_trace; | |
625 | int ret; | |
626 | ||
3209cff4 SRRH |
627 | ret = alloc_snapshot(tr); |
628 | if (WARN_ON(ret < 0)) | |
629 | return; | |
ad909e21 SRRH |
630 | |
631 | tracing_snapshot(); | |
632 | } | |
1b22e382 | 633 | EXPORT_SYMBOL_GPL(tracing_snapshot_alloc); |
ad909e21 SRRH |
634 | #else |
635 | void tracing_snapshot(void) | |
636 | { | |
637 | WARN_ONCE(1, "Snapshot feature not enabled, but internal snapshot used"); | |
638 | } | |
1b22e382 | 639 | EXPORT_SYMBOL_GPL(tracing_snapshot); |
ad909e21 SRRH |
640 | void tracing_snapshot_alloc(void) |
641 | { | |
642 | /* Give warning */ | |
643 | tracing_snapshot(); | |
644 | } | |
1b22e382 | 645 | EXPORT_SYMBOL_GPL(tracing_snapshot_alloc); |
ad909e21 SRRH |
646 | #endif /* CONFIG_TRACER_SNAPSHOT */ |
647 | ||
2fd821ee SRRH |
648 | void tracer_tracing_off(struct trace_array *tr) |
649 | { | |
650 | if (tr->trace_buffer.buffer) | |
651 | ring_buffer_record_off(tr->trace_buffer.buffer); | |
652 | /* | |
653 | * This flag is looked at when buffers haven't been allocated | |
654 | * yet, or by some tracers (like irqsoff), that just want to | |
655 | * know if the ring buffer has been disabled, but it can handle | |
656 | * races of where it gets disabled but we still do a record. | |
657 | * As the check is in the fast path of the tracers, it is more | |
658 | * important to be fast than accurate. | |
659 | */ | |
660 | tr->buffer_disabled = 1; | |
661 | /* Make the flag seen by readers */ | |
662 | smp_wmb(); | |
663 | } | |
664 | ||
499e5470 SR |
665 | /** |
666 | * tracing_off - turn off tracing buffers | |
667 | * | |
668 | * This function stops the tracing buffers from recording data. | |
669 | * It does not disable any overhead the tracers themselves may | |
670 | * be causing. This function simply causes all recording to | |
671 | * the ring buffers to fail. | |
672 | */ | |
673 | void tracing_off(void) | |
674 | { | |
6fa3eb70 S |
675 | #ifdef CONFIG_MTK_SCHED_TRACERS |
676 | trace_tracing_on(0, CALLER_ADDR0); | |
677 | #endif | |
2fd821ee | 678 | tracer_tracing_off(&global_trace); |
499e5470 SR |
679 | } |
680 | EXPORT_SYMBOL_GPL(tracing_off); | |
681 | ||
2fd821ee SRRH |
682 | /** |
683 | * tracer_tracing_is_on - show real state of ring buffer enabled | |
684 | * @tr : the trace array to know if ring buffer is enabled | |
685 | * | |
686 | * Shows real state of the ring buffer if it is enabled or not. | |
687 | */ | |
688 | int tracer_tracing_is_on(struct trace_array *tr) | |
689 | { | |
690 | if (tr->trace_buffer.buffer) | |
691 | return ring_buffer_record_is_on(tr->trace_buffer.buffer); | |
692 | return !tr->buffer_disabled; | |
693 | } | |
694 | ||
499e5470 SR |
695 | /** |
696 | * tracing_is_on - show state of ring buffers enabled | |
697 | */ | |
698 | int tracing_is_on(void) | |
699 | { | |
2fd821ee | 700 | return tracer_tracing_is_on(&global_trace); |
499e5470 SR |
701 | } |
702 | EXPORT_SYMBOL_GPL(tracing_is_on); | |
703 | ||
3928a8a2 | 704 | static int __init set_buf_size(char *str) |
bc0c38d1 | 705 | { |
3928a8a2 | 706 | unsigned long buf_size; |
c6caeeb1 | 707 | |
bc0c38d1 SR |
708 | if (!str) |
709 | return 0; | |
9d612bef | 710 | buf_size = memparse(str, &str); |
c6caeeb1 | 711 | /* nr_entries can not be zero */ |
9d612bef | 712 | if (buf_size == 0) |
c6caeeb1 | 713 | return 0; |
3928a8a2 | 714 | trace_buf_size = buf_size; |
6fa3eb70 S |
715 | #ifdef CONFIG_MTK_SCHED_TRACERS |
716 | trace_buf_size_cpu0 = | |
717 | trace_buf_size_cpuX = buf_size ; | |
718 | trace_buf_size_updated_from_cmdline = 1; | |
719 | #endif | |
bc0c38d1 SR |
720 | return 1; |
721 | } | |
3928a8a2 | 722 | __setup("trace_buf_size=", set_buf_size); |
bc0c38d1 | 723 | |
0e950173 TB |
724 | static int __init set_tracing_thresh(char *str) |
725 | { | |
87abb3b1 | 726 | unsigned long threshold; |
0e950173 TB |
727 | int ret; |
728 | ||
729 | if (!str) | |
730 | return 0; | |
bcd83ea6 | 731 | ret = kstrtoul(str, 0, &threshold); |
0e950173 TB |
732 | if (ret < 0) |
733 | return 0; | |
87abb3b1 | 734 | tracing_thresh = threshold * 1000; |
0e950173 TB |
735 | return 1; |
736 | } | |
737 | __setup("tracing_thresh=", set_tracing_thresh); | |
738 | ||
57f50be1 SR |
739 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
740 | { | |
741 | return nsecs / 1000; | |
742 | } | |
743 | ||
4fcdae83 | 744 | /* These must match the bit postions in trace_iterator_flags */ |
bc0c38d1 SR |
745 | static const char *trace_options[] = { |
746 | "print-parent", | |
747 | "sym-offset", | |
748 | "sym-addr", | |
749 | "verbose", | |
f9896bf3 | 750 | "raw", |
5e3ca0ec | 751 | "hex", |
cb0f12aa | 752 | "bin", |
2a2cc8f7 | 753 | "block", |
86387f7e | 754 | "stacktrace", |
5e1607a0 | 755 | "trace_printk", |
b2a866f9 | 756 | "ftrace_preempt", |
9f029e83 | 757 | "branch", |
12ef7d44 | 758 | "annotate", |
02b67518 | 759 | "userstacktrace", |
b54d3de9 | 760 | "sym-userobj", |
66896a85 | 761 | "printk-msg-only", |
c4a8e8be | 762 | "context-info", |
c032ef64 | 763 | "latency-format", |
be6f164a | 764 | "sleep-time", |
a2a16d6a | 765 | "graph-time", |
e870e9a1 | 766 | "record-cmd", |
750912fa | 767 | "overwrite", |
cf30cf67 | 768 | "disable_on_free", |
77271ce4 | 769 | "irq-info", |
5224c3a3 | 770 | "markers", |
328df475 | 771 | "function-trace", |
6fa3eb70 | 772 | "print-tgid", |
bc0c38d1 SR |
773 | NULL |
774 | }; | |
775 | ||
5079f326 Z |
776 | static struct { |
777 | u64 (*func)(void); | |
778 | const char *name; | |
8be0709f | 779 | int in_ns; /* is this clock in nanoseconds? */ |
5079f326 | 780 | } trace_clocks[] = { |
8be0709f DS |
781 | { trace_clock_local, "local", 1 }, |
782 | { trace_clock_global, "global", 1 }, | |
783 | { trace_clock_counter, "counter", 0 }, | |
efd39f77 | 784 | { trace_clock_jiffies, "uptime", 0 }, |
76f11917 | 785 | { trace_clock, "perf", 1 }, |
8cbd9cc6 | 786 | ARCH_TRACE_CLOCKS |
5079f326 Z |
787 | }; |
788 | ||
b63f39ea | 789 | /* |
790 | * trace_parser_get_init - gets the buffer for trace parser | |
791 | */ | |
792 | int trace_parser_get_init(struct trace_parser *parser, int size) | |
793 | { | |
794 | memset(parser, 0, sizeof(*parser)); | |
795 | ||
796 | parser->buffer = kmalloc(size, GFP_KERNEL); | |
797 | if (!parser->buffer) | |
798 | return 1; | |
799 | ||
800 | parser->size = size; | |
801 | return 0; | |
802 | } | |
803 | ||
804 | /* | |
805 | * trace_parser_put - frees the buffer for trace parser | |
806 | */ | |
807 | void trace_parser_put(struct trace_parser *parser) | |
808 | { | |
809 | kfree(parser->buffer); | |
810 | } | |
811 | ||
812 | /* | |
813 | * trace_get_user - reads the user input string separated by space | |
814 | * (matched by isspace(ch)) | |
815 | * | |
816 | * For each string found the 'struct trace_parser' is updated, | |
817 | * and the function returns. | |
818 | * | |
819 | * Returns number of bytes read. | |
820 | * | |
821 | * See kernel/trace/trace.h for 'struct trace_parser' details. | |
822 | */ | |
823 | int trace_get_user(struct trace_parser *parser, const char __user *ubuf, | |
824 | size_t cnt, loff_t *ppos) | |
825 | { | |
826 | char ch; | |
827 | size_t read = 0; | |
828 | ssize_t ret; | |
829 | ||
830 | if (!*ppos) | |
831 | trace_parser_clear(parser); | |
832 | ||
833 | ret = get_user(ch, ubuf++); | |
834 | if (ret) | |
835 | goto out; | |
836 | ||
837 | read++; | |
838 | cnt--; | |
839 | ||
840 | /* | |
841 | * The parser is not finished with the last write, | |
842 | * continue reading the user input without skipping spaces. | |
843 | */ | |
844 | if (!parser->cont) { | |
845 | /* skip white space */ | |
846 | while (cnt && isspace(ch)) { | |
847 | ret = get_user(ch, ubuf++); | |
848 | if (ret) | |
849 | goto out; | |
850 | read++; | |
851 | cnt--; | |
852 | } | |
853 | ||
854 | /* only spaces were written */ | |
855 | if (isspace(ch)) { | |
856 | *ppos += read; | |
857 | ret = read; | |
858 | goto out; | |
859 | } | |
860 | ||
861 | parser->idx = 0; | |
862 | } | |
863 | ||
864 | /* read the non-space input */ | |
865 | while (cnt && !isspace(ch)) { | |
3c235a33 | 866 | if (parser->idx < parser->size - 1) |
b63f39ea | 867 | parser->buffer[parser->idx++] = ch; |
868 | else { | |
869 | ret = -EINVAL; | |
870 | goto out; | |
871 | } | |
872 | ret = get_user(ch, ubuf++); | |
873 | if (ret) | |
874 | goto out; | |
875 | read++; | |
876 | cnt--; | |
877 | } | |
878 | ||
879 | /* We either got finished input or we have to wait for another call. */ | |
880 | if (isspace(ch)) { | |
881 | parser->buffer[parser->idx] = 0; | |
882 | parser->cont = false; | |
84300636 | 883 | } else if (parser->idx < parser->size - 1) { |
b63f39ea | 884 | parser->cont = true; |
885 | parser->buffer[parser->idx++] = ch; | |
84300636 SR |
886 | } else { |
887 | ret = -EINVAL; | |
888 | goto out; | |
b63f39ea | 889 | } |
890 | ||
891 | *ppos += read; | |
892 | ret = read; | |
893 | ||
894 | out: | |
895 | return ret; | |
896 | } | |
897 | ||
6c6c2796 PP |
898 | ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) |
899 | { | |
900 | int len; | |
901 | int ret; | |
902 | ||
2dc5d12b SR |
903 | if (!cnt) |
904 | return 0; | |
905 | ||
6c6c2796 PP |
906 | if (s->len <= s->readpos) |
907 | return -EBUSY; | |
908 | ||
909 | len = s->len - s->readpos; | |
910 | if (cnt > len) | |
911 | cnt = len; | |
912 | ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); | |
2dc5d12b | 913 | if (ret == cnt) |
6c6c2796 PP |
914 | return -EFAULT; |
915 | ||
2dc5d12b SR |
916 | cnt -= ret; |
917 | ||
e74da523 | 918 | s->readpos += cnt; |
6c6c2796 | 919 | return cnt; |
214023c3 SR |
920 | } |
921 | ||
b8b94265 | 922 | static ssize_t trace_seq_to_buffer(struct trace_seq *s, void *buf, size_t cnt) |
3c56819b EGM |
923 | { |
924 | int len; | |
3c56819b EGM |
925 | |
926 | if (s->len <= s->readpos) | |
927 | return -EBUSY; | |
928 | ||
929 | len = s->len - s->readpos; | |
930 | if (cnt > len) | |
931 | cnt = len; | |
5a26c8f0 | 932 | memcpy(buf, s->buffer + s->readpos, cnt); |
3c56819b | 933 | |
e74da523 | 934 | s->readpos += cnt; |
3c56819b EGM |
935 | return cnt; |
936 | } | |
937 | ||
5d4a9dba SR |
938 | /* |
939 | * ftrace_max_lock is used to protect the swapping of buffers | |
940 | * when taking a max snapshot. The buffers themselves are | |
941 | * protected by per_cpu spinlocks. But the action of the swap | |
942 | * needs its own lock. | |
943 | * | |
445c8951 | 944 | * This is defined as a arch_spinlock_t in order to help |
5d4a9dba SR |
945 | * with performance when lockdep debugging is enabled. |
946 | * | |
947 | * It is also used in other places outside the update_max_tr | |
948 | * so it needs to be defined outside of the | |
949 | * CONFIG_TRACER_MAX_TRACE. | |
950 | */ | |
445c8951 | 951 | static arch_spinlock_t ftrace_max_lock = |
edc35bd7 | 952 | (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED; |
5d4a9dba | 953 | |
0e950173 TB |
954 | unsigned long __read_mostly tracing_thresh; |
955 | ||
5d4a9dba SR |
956 | #ifdef CONFIG_TRACER_MAX_TRACE |
957 | unsigned long __read_mostly tracing_max_latency; | |
5d4a9dba SR |
958 | |
959 | /* | |
960 | * Copy the new maximum trace into the separate maximum-trace | |
961 | * structure. (this way the maximum trace is permanently saved, | |
962 | * for later retrieval via /sys/kernel/debug/tracing/latency_trace) | |
963 | */ | |
964 | static void | |
965 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) | |
966 | { | |
12883efb SRRH |
967 | struct trace_buffer *trace_buf = &tr->trace_buffer; |
968 | struct trace_buffer *max_buf = &tr->max_buffer; | |
969 | struct trace_array_cpu *data = per_cpu_ptr(trace_buf->data, cpu); | |
970 | struct trace_array_cpu *max_data = per_cpu_ptr(max_buf->data, cpu); | |
5d4a9dba | 971 | |
12883efb SRRH |
972 | max_buf->cpu = cpu; |
973 | max_buf->time_start = data->preempt_timestamp; | |
5d4a9dba | 974 | |
8248ac05 SR |
975 | max_data->saved_latency = tracing_max_latency; |
976 | max_data->critical_start = data->critical_start; | |
977 | max_data->critical_end = data->critical_end; | |
5d4a9dba | 978 | |
1acaa1b2 | 979 | memcpy(max_data->comm, tsk->comm, TASK_COMM_LEN); |
8248ac05 | 980 | max_data->pid = tsk->pid; |
f17a5194 SRRH |
981 | /* |
982 | * If tsk == current, then use current_uid(), as that does not use | |
983 | * RCU. The irq tracer can be called out of RCU scope. | |
984 | */ | |
985 | if (tsk == current) | |
986 | max_data->uid = current_uid(); | |
987 | else | |
988 | max_data->uid = task_uid(tsk); | |
989 | ||
8248ac05 SR |
990 | max_data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; |
991 | max_data->policy = tsk->policy; | |
992 | max_data->rt_priority = tsk->rt_priority; | |
5d4a9dba SR |
993 | |
994 | /* record this tasks comm */ | |
995 | tracing_record_cmdline(tsk); | |
996 | } | |
997 | ||
4fcdae83 SR |
998 | /** |
999 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr | |
1000 | * @tr: tracer | |
1001 | * @tsk: the task with the latency | |
1002 | * @cpu: The cpu that initiated the trace. | |
1003 | * | |
1004 | * Flip the buffers between the @tr and the max_tr and record information | |
1005 | * about which task was the cause of this latency. | |
1006 | */ | |
e309b41d | 1007 | void |
bc0c38d1 SR |
1008 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
1009 | { | |
2721e72d | 1010 | struct ring_buffer *buf; |
bc0c38d1 | 1011 | |
2b6080f2 | 1012 | if (tr->stop_count) |
b8de7bd1 SR |
1013 | return; |
1014 | ||
4c11d7ae | 1015 | WARN_ON_ONCE(!irqs_disabled()); |
34600f0e | 1016 | |
45ad21ca | 1017 | if (!tr->allocated_snapshot) { |
debdd57f | 1018 | /* Only the nop tracer should hit this when disabling */ |
2b6080f2 | 1019 | WARN_ON_ONCE(tr->current_trace != &nop_trace); |
34600f0e | 1020 | return; |
debdd57f | 1021 | } |
34600f0e | 1022 | |
0199c4e6 | 1023 | arch_spin_lock(&ftrace_max_lock); |
3928a8a2 | 1024 | |
12883efb SRRH |
1025 | buf = tr->trace_buffer.buffer; |
1026 | tr->trace_buffer.buffer = tr->max_buffer.buffer; | |
1027 | tr->max_buffer.buffer = buf; | |
3928a8a2 | 1028 | |
bc0c38d1 | 1029 | __update_max_tr(tr, tsk, cpu); |
0199c4e6 | 1030 | arch_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
1031 | } |
1032 | ||
1033 | /** | |
1034 | * update_max_tr_single - only copy one trace over, and reset the rest | |
1035 | * @tr - tracer | |
1036 | * @tsk - task with the latency | |
1037 | * @cpu - the cpu of the buffer to copy. | |
4fcdae83 SR |
1038 | * |
1039 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. | |
bc0c38d1 | 1040 | */ |
e309b41d | 1041 | void |
bc0c38d1 SR |
1042 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
1043 | { | |
3928a8a2 | 1044 | int ret; |
bc0c38d1 | 1045 | |
2b6080f2 | 1046 | if (tr->stop_count) |
b8de7bd1 SR |
1047 | return; |
1048 | ||
4c11d7ae | 1049 | WARN_ON_ONCE(!irqs_disabled()); |
6c24499f | 1050 | if (!tr->allocated_snapshot) { |
2930e04d | 1051 | /* Only the nop tracer should hit this when disabling */ |
9e8529af | 1052 | WARN_ON_ONCE(tr->current_trace != &nop_trace); |
ef710e10 | 1053 | return; |
2930e04d | 1054 | } |
ef710e10 | 1055 | |
0199c4e6 | 1056 | arch_spin_lock(&ftrace_max_lock); |
bc0c38d1 | 1057 | |
12883efb | 1058 | ret = ring_buffer_swap_cpu(tr->max_buffer.buffer, tr->trace_buffer.buffer, cpu); |
3928a8a2 | 1059 | |
e8165dbb SR |
1060 | if (ret == -EBUSY) { |
1061 | /* | |
1062 | * We failed to swap the buffer due to a commit taking | |
1063 | * place on this CPU. We fail to record, but we reset | |
1064 | * the max trace buffer (no one writes directly to it) | |
1065 | * and flag that it failed. | |
1066 | */ | |
12883efb | 1067 | trace_array_printk_buf(tr->max_buffer.buffer, _THIS_IP_, |
e8165dbb SR |
1068 | "Failed to swap buffers due to commit in progress\n"); |
1069 | } | |
1070 | ||
e8165dbb | 1071 | WARN_ON_ONCE(ret && ret != -EAGAIN && ret != -EBUSY); |
bc0c38d1 SR |
1072 | |
1073 | __update_max_tr(tr, tsk, cpu); | |
0199c4e6 | 1074 | arch_spin_unlock(&ftrace_max_lock); |
bc0c38d1 | 1075 | } |
5d4a9dba | 1076 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
bc0c38d1 | 1077 | |
561237e4 | 1078 | static int default_wait_pipe(struct trace_iterator *iter) |
0d5c6e1c | 1079 | { |
15693458 SRRH |
1080 | /* Iterators are static, they should be filled or empty */ |
1081 | if (trace_buffer_iter(iter, iter->cpu_file)) | |
561237e4 | 1082 | return 0; |
0d5c6e1c | 1083 | |
561237e4 | 1084 | return ring_buffer_wait(iter->trace_buffer->buffer, iter->cpu_file); |
0d5c6e1c SR |
1085 | } |
1086 | ||
f4e781c0 SRRH |
1087 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
1088 | static int run_tracer_selftest(struct tracer *type) | |
1089 | { | |
1090 | struct trace_array *tr = &global_trace; | |
1091 | struct tracer *saved_tracer = tr->current_trace; | |
1092 | int ret; | |
0d5c6e1c | 1093 | |
f4e781c0 SRRH |
1094 | if (!type->selftest || tracing_selftest_disabled) |
1095 | return 0; | |
0d5c6e1c SR |
1096 | |
1097 | /* | |
f4e781c0 SRRH |
1098 | * Run a selftest on this tracer. |
1099 | * Here we reset the trace buffer, and set the current | |
1100 | * tracer to be this tracer. The tracer can then run some | |
1101 | * internal tracing to verify that everything is in order. | |
1102 | * If we fail, we do not register this tracer. | |
0d5c6e1c | 1103 | */ |
f4e781c0 | 1104 | tracing_reset_online_cpus(&tr->trace_buffer); |
0d5c6e1c | 1105 | |
f4e781c0 SRRH |
1106 | tr->current_trace = type; |
1107 | ||
1108 | #ifdef CONFIG_TRACER_MAX_TRACE | |
1109 | if (type->use_max_tr) { | |
1110 | /* If we expanded the buffers, make sure the max is expanded too */ | |
1111 | if (ring_buffer_expanded) | |
1112 | ring_buffer_resize(tr->max_buffer.buffer, trace_buf_size, | |
1113 | RING_BUFFER_ALL_CPUS); | |
1114 | tr->allocated_snapshot = true; | |
1115 | } | |
1116 | #endif | |
1117 | ||
1118 | /* the test is responsible for initializing and enabling */ | |
1119 | pr_info("Testing tracer %s: ", type->name); | |
1120 | ret = type->selftest(type, tr); | |
1121 | /* the test is responsible for resetting too */ | |
1122 | tr->current_trace = saved_tracer; | |
1123 | if (ret) { | |
1124 | printk(KERN_CONT "FAILED!\n"); | |
1125 | /* Add the warning after printing 'FAILED' */ | |
1126 | WARN_ON(1); | |
1127 | return -1; | |
1128 | } | |
1129 | /* Only reset on passing, to avoid touching corrupted buffers */ | |
1130 | tracing_reset_online_cpus(&tr->trace_buffer); | |
1131 | ||
1132 | #ifdef CONFIG_TRACER_MAX_TRACE | |
1133 | if (type->use_max_tr) { | |
1134 | tr->allocated_snapshot = false; | |
0d5c6e1c | 1135 | |
f4e781c0 SRRH |
1136 | /* Shrink the max buffer again */ |
1137 | if (ring_buffer_expanded) | |
1138 | ring_buffer_resize(tr->max_buffer.buffer, 1, | |
1139 | RING_BUFFER_ALL_CPUS); | |
1140 | } | |
1141 | #endif | |
1142 | ||
1143 | printk(KERN_CONT "PASSED\n"); | |
1144 | return 0; | |
1145 | } | |
1146 | #else | |
1147 | static inline int run_tracer_selftest(struct tracer *type) | |
1148 | { | |
1149 | return 0; | |
0d5c6e1c | 1150 | } |
f4e781c0 | 1151 | #endif /* CONFIG_FTRACE_STARTUP_TEST */ |
0d5c6e1c | 1152 | |
4fcdae83 SR |
1153 | /** |
1154 | * register_tracer - register a tracer with the ftrace system. | |
1155 | * @type - the plugin for the tracer | |
1156 | * | |
1157 | * Register a new plugin tracer. | |
1158 | */ | |
bc0c38d1 SR |
1159 | int register_tracer(struct tracer *type) |
1160 | { | |
1161 | struct tracer *t; | |
bc0c38d1 SR |
1162 | int ret = 0; |
1163 | ||
1164 | if (!type->name) { | |
1165 | pr_info("Tracer must have a name\n"); | |
1166 | return -1; | |
1167 | } | |
1168 | ||
24a461d5 | 1169 | if (strlen(type->name) >= MAX_TRACER_SIZE) { |
ee6c2c1b LZ |
1170 | pr_info("Tracer has a name longer than %d\n", MAX_TRACER_SIZE); |
1171 | return -1; | |
1172 | } | |
1173 | ||
bc0c38d1 | 1174 | mutex_lock(&trace_types_lock); |
86fa2f60 | 1175 | |
8e1b82e0 FW |
1176 | tracing_selftest_running = true; |
1177 | ||
bc0c38d1 SR |
1178 | for (t = trace_types; t; t = t->next) { |
1179 | if (strcmp(type->name, t->name) == 0) { | |
1180 | /* already found */ | |
ee6c2c1b | 1181 | pr_info("Tracer %s already registered\n", |
bc0c38d1 SR |
1182 | type->name); |
1183 | ret = -1; | |
1184 | goto out; | |
1185 | } | |
1186 | } | |
1187 | ||
adf9f195 FW |
1188 | if (!type->set_flag) |
1189 | type->set_flag = &dummy_set_flag; | |
1190 | if (!type->flags) | |
1191 | type->flags = &dummy_tracer_flags; | |
1192 | else | |
1193 | if (!type->flags->opts) | |
1194 | type->flags->opts = dummy_tracer_opt; | |
6eaaa5d5 FW |
1195 | if (!type->wait_pipe) |
1196 | type->wait_pipe = default_wait_pipe; | |
1197 | ||
f4e781c0 SRRH |
1198 | ret = run_tracer_selftest(type); |
1199 | if (ret < 0) | |
1200 | goto out; | |
60a11774 | 1201 | |
bc0c38d1 SR |
1202 | type->next = trace_types; |
1203 | trace_types = type; | |
60a11774 | 1204 | |
bc0c38d1 | 1205 | out: |
8e1b82e0 | 1206 | tracing_selftest_running = false; |
bc0c38d1 SR |
1207 | mutex_unlock(&trace_types_lock); |
1208 | ||
dac74940 SR |
1209 | if (ret || !default_bootup_tracer) |
1210 | goto out_unlock; | |
1211 | ||
ee6c2c1b | 1212 | if (strncmp(default_bootup_tracer, type->name, MAX_TRACER_SIZE)) |
dac74940 SR |
1213 | goto out_unlock; |
1214 | ||
1215 | printk(KERN_INFO "Starting tracer '%s'\n", type->name); | |
1216 | /* Do we want this tracer to start on bootup? */ | |
1217 | tracing_set_tracer(type->name); | |
1218 | default_bootup_tracer = NULL; | |
1219 | /* disable other selftests, since this will break it. */ | |
55034cd6 | 1220 | tracing_selftest_disabled = true; |
b2821ae6 | 1221 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
dac74940 SR |
1222 | printk(KERN_INFO "Disabling FTRACE selftests due to running tracer '%s'\n", |
1223 | type->name); | |
b2821ae6 | 1224 | #endif |
b2821ae6 | 1225 | |
dac74940 | 1226 | out_unlock: |
bc0c38d1 SR |
1227 | return ret; |
1228 | } | |
1229 | ||
12883efb | 1230 | void tracing_reset(struct trace_buffer *buf, int cpu) |
f633903a | 1231 | { |
12883efb | 1232 | struct ring_buffer *buffer = buf->buffer; |
f633903a | 1233 | |
a5416411 HT |
1234 | if (!buffer) |
1235 | return; | |
1236 | ||
f633903a SR |
1237 | ring_buffer_record_disable(buffer); |
1238 | ||
1239 | /* Make sure all commits have finished */ | |
1240 | synchronize_sched(); | |
68179686 | 1241 | ring_buffer_reset_cpu(buffer, cpu); |
f633903a | 1242 | |
6fa3eb70 | 1243 | printk(KERN_INFO "[ftrace]cpu %d trace reset\n", cpu); |
f633903a SR |
1244 | ring_buffer_record_enable(buffer); |
1245 | } | |
1246 | ||
12883efb | 1247 | void tracing_reset_online_cpus(struct trace_buffer *buf) |
213cc060 | 1248 | { |
12883efb | 1249 | struct ring_buffer *buffer = buf->buffer; |
213cc060 PE |
1250 | int cpu; |
1251 | ||
a5416411 HT |
1252 | if (!buffer) |
1253 | return; | |
1254 | ||
621968cd SR |
1255 | ring_buffer_record_disable(buffer); |
1256 | ||
1257 | /* Make sure all commits have finished */ | |
1258 | synchronize_sched(); | |
1259 | ||
e88512e7 | 1260 | buf->time_start = buffer_ftrace_now(buf, buf->cpu); |
213cc060 PE |
1261 | |
1262 | for_each_online_cpu(cpu) | |
68179686 | 1263 | ring_buffer_reset_cpu(buffer, cpu); |
621968cd | 1264 | |
6fa3eb70 | 1265 | printk(KERN_INFO "[ftrace]all cpu trace reset\n"); |
621968cd | 1266 | ring_buffer_record_enable(buffer); |
213cc060 PE |
1267 | } |
1268 | ||
c62771c8 | 1269 | /* Must have trace_types_lock held */ |
873c642f | 1270 | void tracing_reset_all_online_cpus(void) |
9456f0fa | 1271 | { |
873c642f SRRH |
1272 | struct trace_array *tr; |
1273 | ||
873c642f | 1274 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
12883efb SRRH |
1275 | tracing_reset_online_cpus(&tr->trace_buffer); |
1276 | #ifdef CONFIG_TRACER_MAX_TRACE | |
1277 | tracing_reset_online_cpus(&tr->max_buffer); | |
1278 | #endif | |
873c642f | 1279 | } |
9456f0fa SR |
1280 | } |
1281 | ||
bc0c38d1 | 1282 | #define SAVED_CMDLINES 128 |
2c7eea4c | 1283 | #define NO_CMDLINE_MAP UINT_MAX |
6fa3eb70 S |
1284 | #ifdef CONFIG_MTK_EXTMEM |
1285 | extern void* extmem_malloc_page_align(size_t bytes); | |
1286 | #define SIZEOF_MAP_PID_TO_CMDLINE ((PID_MAX_DEFAULT+1)*sizeof(unsigned)) | |
1287 | #define SIZEOF_MAP_CMDLINE_TO_PID (SAVED_CMDLINES*sizeof(unsigned)) | |
1288 | static unsigned* map_pid_to_cmdline = NULL; | |
1289 | static unsigned* map_cmdline_to_pid = NULL; | |
1290 | #else | |
bc0c38d1 SR |
1291 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; |
1292 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; | |
6fa3eb70 | 1293 | #endif |
bc0c38d1 | 1294 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; |
6fa3eb70 | 1295 | static unsigned saved_tgids[SAVED_CMDLINES]; |
bc0c38d1 | 1296 | static int cmdline_idx; |
edc35bd7 | 1297 | static arch_spinlock_t trace_cmdline_lock = __ARCH_SPIN_LOCK_UNLOCKED; |
25b0b44a | 1298 | |
25b0b44a | 1299 | /* temporary disable recording */ |
4fd27358 | 1300 | static atomic_t trace_record_cmdline_disabled __read_mostly; |
bc0c38d1 SR |
1301 | |
1302 | static void trace_init_cmdlines(void) | |
1303 | { | |
6fa3eb70 S |
1304 | #ifdef CONFIG_MTK_EXTMEM |
1305 | map_pid_to_cmdline = (unsigned *) extmem_malloc_page_align(SIZEOF_MAP_PID_TO_CMDLINE); | |
1306 | if(map_pid_to_cmdline == NULL) { | |
1307 | pr_err("%s[%s] ext memory alloc failed!!!\n", __FILE__, __FUNCTION__); | |
1308 | map_pid_to_cmdline = (unsigned *)vmalloc(SIZEOF_MAP_PID_TO_CMDLINE); | |
1309 | } | |
1310 | map_cmdline_to_pid = (unsigned *) extmem_malloc_page_align(SIZEOF_MAP_CMDLINE_TO_PID); | |
1311 | if(map_pid_to_cmdline == NULL) { | |
1312 | pr_warning("%s[%s] ext memory alloc failed!!!\n", __FILE__, __FUNCTION__); | |
1313 | map_cmdline_to_pid = (unsigned *)vmalloc(SIZEOF_MAP_CMDLINE_TO_PID); | |
1314 | } | |
1315 | memset(map_pid_to_cmdline, NO_CMDLINE_MAP, SIZEOF_MAP_PID_TO_CMDLINE); | |
1316 | memset(map_cmdline_to_pid, NO_CMDLINE_MAP, SIZEOF_MAP_CMDLINE_TO_PID); | |
1317 | #else | |
2c7eea4c TG |
1318 | memset(&map_pid_to_cmdline, NO_CMDLINE_MAP, sizeof(map_pid_to_cmdline)); |
1319 | memset(&map_cmdline_to_pid, NO_CMDLINE_MAP, sizeof(map_cmdline_to_pid)); | |
6fa3eb70 | 1320 | #endif |
bc0c38d1 SR |
1321 | cmdline_idx = 0; |
1322 | } | |
1323 | ||
b5130b1e CE |
1324 | int is_tracing_stopped(void) |
1325 | { | |
2b6080f2 | 1326 | return global_trace.stop_count; |
b5130b1e CE |
1327 | } |
1328 | ||
69bb54ec SR |
1329 | /** |
1330 | * ftrace_off_permanent - disable all ftrace code permanently | |
1331 | * | |
1332 | * This should only be called when a serious anomally has | |
1333 | * been detected. This will turn off the function tracing, | |
1334 | * ring buffers, and other tracing utilites. It takes no | |
1335 | * locks and can be called from any context. | |
1336 | */ | |
1337 | void ftrace_off_permanent(void) | |
1338 | { | |
1339 | tracing_disabled = 1; | |
1340 | ftrace_stop(); | |
1341 | tracing_off_permanent(); | |
1342 | } | |
1343 | ||
0f048701 SR |
1344 | /** |
1345 | * tracing_start - quick start of the tracer | |
1346 | * | |
1347 | * If tracing is enabled but was stopped by tracing_stop, | |
1348 | * this will start the tracer back up. | |
1349 | */ | |
1350 | void tracing_start(void) | |
1351 | { | |
1352 | struct ring_buffer *buffer; | |
1353 | unsigned long flags; | |
6fa3eb70 | 1354 | int reset_ftrace = 0; |
0f048701 SR |
1355 | |
1356 | if (tracing_disabled) | |
1357 | return; | |
1358 | ||
2b6080f2 SR |
1359 | raw_spin_lock_irqsave(&global_trace.start_lock, flags); |
1360 | if (--global_trace.stop_count) { | |
1361 | if (global_trace.stop_count < 0) { | |
b06a8301 SR |
1362 | /* Someone screwed up their debugging */ |
1363 | WARN_ON_ONCE(1); | |
2b6080f2 | 1364 | global_trace.stop_count = 0; |
6fa3eb70 | 1365 | reset_ftrace = 1; |
b06a8301 | 1366 | } |
0f048701 | 1367 | goto out; |
6fa3eb70 S |
1368 | }else |
1369 | reset_ftrace = 1; | |
1370 | ||
0f048701 | 1371 | |
a2f80714 SR |
1372 | /* Prevent the buffers from switching */ |
1373 | arch_spin_lock(&ftrace_max_lock); | |
0f048701 | 1374 | |
12883efb | 1375 | buffer = global_trace.trace_buffer.buffer; |
0f048701 SR |
1376 | if (buffer) |
1377 | ring_buffer_record_enable(buffer); | |
1378 | ||
12883efb SRRH |
1379 | #ifdef CONFIG_TRACER_MAX_TRACE |
1380 | buffer = global_trace.max_buffer.buffer; | |
0f048701 SR |
1381 | if (buffer) |
1382 | ring_buffer_record_enable(buffer); | |
12883efb | 1383 | #endif |
0f048701 | 1384 | |
a2f80714 SR |
1385 | arch_spin_unlock(&ftrace_max_lock); |
1386 | ||
0f048701 | 1387 | out: |
2b6080f2 | 1388 | raw_spin_unlock_irqrestore(&global_trace.start_lock, flags); |
6fa3eb70 S |
1389 | |
1390 | #ifdef CONFIG_MTK_SCHED_TRACERS | |
1391 | // reset ring buffer when all readers left | |
1392 | if(reset_ftrace == 1 && global_trace.stop_count == 0) | |
1393 | tracing_reset_online_cpus(&global_trace.trace_buffer); | |
1394 | #endif | |
2b6080f2 SR |
1395 | } |
1396 | ||
1397 | static void tracing_start_tr(struct trace_array *tr) | |
1398 | { | |
1399 | struct ring_buffer *buffer; | |
1400 | unsigned long flags; | |
1401 | ||
1402 | if (tracing_disabled) | |
1403 | return; | |
1404 | ||
1405 | /* If global, we need to also start the max tracer */ | |
1406 | if (tr->flags & TRACE_ARRAY_FL_GLOBAL) | |
1407 | return tracing_start(); | |
1408 | ||
1409 | raw_spin_lock_irqsave(&tr->start_lock, flags); | |
1410 | ||
1411 | if (--tr->stop_count) { | |
1412 | if (tr->stop_count < 0) { | |
1413 | /* Someone screwed up their debugging */ | |
1414 | WARN_ON_ONCE(1); | |
1415 | tr->stop_count = 0; | |
1416 | } | |
1417 | goto out; | |
1418 | } | |
1419 | ||
12883efb | 1420 | buffer = tr->trace_buffer.buffer; |
2b6080f2 SR |
1421 | if (buffer) |
1422 | ring_buffer_record_enable(buffer); | |
1423 | ||
1424 | out: | |
1425 | raw_spin_unlock_irqrestore(&tr->start_lock, flags); | |
0f048701 SR |
1426 | } |
1427 | ||
1428 | /** | |
1429 | * tracing_stop - quick stop of the tracer | |
1430 | * | |
1431 | * Light weight way to stop tracing. Use in conjunction with | |
1432 | * tracing_start. | |
1433 | */ | |
1434 | void tracing_stop(void) | |
1435 | { | |
1436 | struct ring_buffer *buffer; | |
1437 | unsigned long flags; | |
1438 | ||
2b6080f2 SR |
1439 | raw_spin_lock_irqsave(&global_trace.start_lock, flags); |
1440 | if (global_trace.stop_count++) | |
0f048701 SR |
1441 | goto out; |
1442 | ||
a2f80714 SR |
1443 | /* Prevent the buffers from switching */ |
1444 | arch_spin_lock(&ftrace_max_lock); | |
1445 | ||
12883efb | 1446 | buffer = global_trace.trace_buffer.buffer; |
0f048701 SR |
1447 | if (buffer) |
1448 | ring_buffer_record_disable(buffer); | |
1449 | ||
12883efb SRRH |
1450 | #ifdef CONFIG_TRACER_MAX_TRACE |
1451 | buffer = global_trace.max_buffer.buffer; | |
0f048701 SR |
1452 | if (buffer) |
1453 | ring_buffer_record_disable(buffer); | |
12883efb | 1454 | #endif |
0f048701 | 1455 | |
a2f80714 SR |
1456 | arch_spin_unlock(&ftrace_max_lock); |
1457 | ||
0f048701 | 1458 | out: |
2b6080f2 SR |
1459 | raw_spin_unlock_irqrestore(&global_trace.start_lock, flags); |
1460 | } | |
1461 | ||
1462 | static void tracing_stop_tr(struct trace_array *tr) | |
1463 | { | |
1464 | struct ring_buffer *buffer; | |
1465 | unsigned long flags; | |
1466 | ||
1467 | /* If global, we need to also stop the max tracer */ | |
1468 | if (tr->flags & TRACE_ARRAY_FL_GLOBAL) | |
1469 | return tracing_stop(); | |
1470 | ||
1471 | raw_spin_lock_irqsave(&tr->start_lock, flags); | |
1472 | if (tr->stop_count++) | |
1473 | goto out; | |
1474 | ||
12883efb | 1475 | buffer = tr->trace_buffer.buffer; |
2b6080f2 SR |
1476 | if (buffer) |
1477 | ring_buffer_record_disable(buffer); | |
1478 | ||
1479 | out: | |
1480 | raw_spin_unlock_irqrestore(&tr->start_lock, flags); | |
0f048701 SR |
1481 | } |
1482 | ||
e309b41d | 1483 | void trace_stop_cmdline_recording(void); |
bc0c38d1 | 1484 | |
c5bce736 | 1485 | static int trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 | 1486 | { |
a635cf04 | 1487 | unsigned pid, idx; |
bc0c38d1 SR |
1488 | |
1489 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
c5bce736 | 1490 | return 0; |
bc0c38d1 SR |
1491 | |
1492 | /* | |
1493 | * It's not the end of the world if we don't get | |
1494 | * the lock, but we also don't want to spin | |
1495 | * nor do we want to disable interrupts, | |
1496 | * so if we miss here, then better luck next time. | |
1497 | */ | |
0199c4e6 | 1498 | if (!arch_spin_trylock(&trace_cmdline_lock)) |
c5bce736 | 1499 | return 0; |
bc0c38d1 SR |
1500 | |
1501 | idx = map_pid_to_cmdline[tsk->pid]; | |
2c7eea4c | 1502 | if (idx == NO_CMDLINE_MAP) { |
bc0c38d1 SR |
1503 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; |
1504 | ||
a635cf04 CE |
1505 | /* |
1506 | * Check whether the cmdline buffer at idx has a pid | |
1507 | * mapped. We are going to overwrite that entry so we | |
1508 | * need to clear the map_pid_to_cmdline. Otherwise we | |
1509 | * would read the new comm for the old pid. | |
1510 | */ | |
1511 | pid = map_cmdline_to_pid[idx]; | |
1512 | if (pid != NO_CMDLINE_MAP) | |
1513 | map_pid_to_cmdline[pid] = NO_CMDLINE_MAP; | |
bc0c38d1 | 1514 | |
a635cf04 | 1515 | map_cmdline_to_pid[idx] = tsk->pid; |
bc0c38d1 SR |
1516 | map_pid_to_cmdline[tsk->pid] = idx; |
1517 | ||
1518 | cmdline_idx = idx; | |
1519 | } | |
1520 | ||
1521 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); | |
6fa3eb70 | 1522 | saved_tgids[idx] = tsk->tgid; |
bc0c38d1 | 1523 | |
0199c4e6 | 1524 | arch_spin_unlock(&trace_cmdline_lock); |
c5bce736 SRRH |
1525 | |
1526 | return 1; | |
bc0c38d1 SR |
1527 | } |
1528 | ||
4ca53085 | 1529 | void trace_find_cmdline(int pid, char comm[]) |
bc0c38d1 | 1530 | { |
bc0c38d1 SR |
1531 | unsigned map; |
1532 | ||
4ca53085 SR |
1533 | if (!pid) { |
1534 | strcpy(comm, "<idle>"); | |
1535 | return; | |
1536 | } | |
bc0c38d1 | 1537 | |
74bf4076 SR |
1538 | if (WARN_ON_ONCE(pid < 0)) { |
1539 | strcpy(comm, "<XXX>"); | |
1540 | return; | |
1541 | } | |
1542 | ||
4ca53085 SR |
1543 | if (pid > PID_MAX_DEFAULT) { |
1544 | strcpy(comm, "<...>"); | |
1545 | return; | |
1546 | } | |
bc0c38d1 | 1547 | |
5b6045a9 | 1548 | preempt_disable(); |
0199c4e6 | 1549 | arch_spin_lock(&trace_cmdline_lock); |
bc0c38d1 | 1550 | map = map_pid_to_cmdline[pid]; |
50d88758 TG |
1551 | if (map != NO_CMDLINE_MAP) |
1552 | strcpy(comm, saved_cmdlines[map]); | |
1553 | else | |
1554 | strcpy(comm, "<...>"); | |
bc0c38d1 | 1555 | |
0199c4e6 | 1556 | arch_spin_unlock(&trace_cmdline_lock); |
5b6045a9 | 1557 | preempt_enable(); |
bc0c38d1 SR |
1558 | } |
1559 | ||
6fa3eb70 S |
1560 | int trace_find_tgid(int pid) |
1561 | { | |
1562 | unsigned map; | |
1563 | int tgid; | |
1564 | ||
1565 | preempt_disable(); | |
1566 | arch_spin_lock(&trace_cmdline_lock); | |
1567 | map = map_pid_to_cmdline[pid]; | |
1568 | if (map != NO_CMDLINE_MAP) | |
1569 | tgid = saved_tgids[map]; | |
1570 | else | |
1571 | tgid = -1; | |
1572 | ||
1573 | arch_spin_unlock(&trace_cmdline_lock); | |
1574 | preempt_enable(); | |
1575 | ||
1576 | return tgid; | |
1577 | } | |
1578 | ||
e309b41d | 1579 | void tracing_record_cmdline(struct task_struct *tsk) |
bc0c38d1 | 1580 | { |
0fb9656d | 1581 | if (atomic_read(&trace_record_cmdline_disabled) || !tracing_is_on()) |
bc0c38d1 SR |
1582 | return; |
1583 | ||
7ffbd48d SR |
1584 | if (!__this_cpu_read(trace_cmdline_save)) |
1585 | return; | |
1586 | ||
c5bce736 SRRH |
1587 | if (trace_save_cmdline(tsk)) |
1588 | __this_cpu_write(trace_cmdline_save, false); | |
bc0c38d1 SR |
1589 | } |
1590 | ||
45dcd8b8 | 1591 | void |
38697053 SR |
1592 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags, |
1593 | int pc) | |
bc0c38d1 SR |
1594 | { |
1595 | struct task_struct *tsk = current; | |
bc0c38d1 | 1596 | |
777e208d SR |
1597 | entry->preempt_count = pc & 0xff; |
1598 | entry->pid = (tsk) ? tsk->pid : 0; | |
1599 | entry->flags = | |
9244489a | 1600 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT |
2e2ca155 | 1601 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
9244489a SR |
1602 | #else |
1603 | TRACE_FLAG_IRQS_NOSUPPORT | | |
1604 | #endif | |
bc0c38d1 SR |
1605 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
1606 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | | |
1607 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); | |
1608 | } | |
f413cdb8 | 1609 | EXPORT_SYMBOL_GPL(tracing_generic_entry_update); |
bc0c38d1 | 1610 | |
e77405ad SR |
1611 | struct ring_buffer_event * |
1612 | trace_buffer_lock_reserve(struct ring_buffer *buffer, | |
1613 | int type, | |
1614 | unsigned long len, | |
1615 | unsigned long flags, int pc) | |
51a763dd ACM |
1616 | { |
1617 | struct ring_buffer_event *event; | |
1618 | ||
e77405ad | 1619 | event = ring_buffer_lock_reserve(buffer, len); |
51a763dd ACM |
1620 | if (event != NULL) { |
1621 | struct trace_entry *ent = ring_buffer_event_data(event); | |
1622 | ||
1623 | tracing_generic_entry_update(ent, flags, pc); | |
1624 | ent->type = type; | |
1625 | } | |
1626 | ||
1627 | return event; | |
1628 | } | |
51a763dd | 1629 | |
7ffbd48d SR |
1630 | void |
1631 | __buffer_unlock_commit(struct ring_buffer *buffer, struct ring_buffer_event *event) | |
1632 | { | |
1633 | __this_cpu_write(trace_cmdline_save, true); | |
1634 | ring_buffer_unlock_commit(buffer, event); | |
1635 | } | |
1636 | ||
e77405ad SR |
1637 | static inline void |
1638 | __trace_buffer_unlock_commit(struct ring_buffer *buffer, | |
1639 | struct ring_buffer_event *event, | |
0d5c6e1c | 1640 | unsigned long flags, int pc) |
51a763dd | 1641 | { |
7ffbd48d | 1642 | __buffer_unlock_commit(buffer, event); |
51a763dd | 1643 | |
e77405ad SR |
1644 | ftrace_trace_stack(buffer, flags, 6, pc); |
1645 | ftrace_trace_userstack(buffer, flags, pc); | |
07edf712 FW |
1646 | } |
1647 | ||
e77405ad SR |
1648 | void trace_buffer_unlock_commit(struct ring_buffer *buffer, |
1649 | struct ring_buffer_event *event, | |
1650 | unsigned long flags, int pc) | |
07edf712 | 1651 | { |
0d5c6e1c | 1652 | __trace_buffer_unlock_commit(buffer, event, flags, pc); |
51a763dd | 1653 | } |
0d5c6e1c | 1654 | EXPORT_SYMBOL_GPL(trace_buffer_unlock_commit); |
51a763dd | 1655 | |
ccb469a1 SR |
1656 | struct ring_buffer_event * |
1657 | trace_event_buffer_lock_reserve(struct ring_buffer **current_rb, | |
1658 | struct ftrace_event_file *ftrace_file, | |
1659 | int type, unsigned long len, | |
1660 | unsigned long flags, int pc) | |
1661 | { | |
12883efb | 1662 | *current_rb = ftrace_file->tr->trace_buffer.buffer; |
ccb469a1 SR |
1663 | return trace_buffer_lock_reserve(*current_rb, |
1664 | type, len, flags, pc); | |
1665 | } | |
1666 | EXPORT_SYMBOL_GPL(trace_event_buffer_lock_reserve); | |
1667 | ||
ef5580d0 | 1668 | struct ring_buffer_event * |
e77405ad SR |
1669 | trace_current_buffer_lock_reserve(struct ring_buffer **current_rb, |
1670 | int type, unsigned long len, | |
ef5580d0 SR |
1671 | unsigned long flags, int pc) |
1672 | { | |
12883efb | 1673 | *current_rb = global_trace.trace_buffer.buffer; |
e77405ad | 1674 | return trace_buffer_lock_reserve(*current_rb, |
ef5580d0 SR |
1675 | type, len, flags, pc); |
1676 | } | |
94487d6d | 1677 | EXPORT_SYMBOL_GPL(trace_current_buffer_lock_reserve); |
ef5580d0 | 1678 | |
e77405ad SR |
1679 | void trace_current_buffer_unlock_commit(struct ring_buffer *buffer, |
1680 | struct ring_buffer_event *event, | |
ef5580d0 SR |
1681 | unsigned long flags, int pc) |
1682 | { | |
0d5c6e1c | 1683 | __trace_buffer_unlock_commit(buffer, event, flags, pc); |
07edf712 | 1684 | } |
94487d6d | 1685 | EXPORT_SYMBOL_GPL(trace_current_buffer_unlock_commit); |
07edf712 | 1686 | |
0d5c6e1c SR |
1687 | void trace_buffer_unlock_commit_regs(struct ring_buffer *buffer, |
1688 | struct ring_buffer_event *event, | |
1689 | unsigned long flags, int pc, | |
1690 | struct pt_regs *regs) | |
1fd8df2c | 1691 | { |
7ffbd48d | 1692 | __buffer_unlock_commit(buffer, event); |
1fd8df2c MH |
1693 | |
1694 | ftrace_trace_stack_regs(buffer, flags, 0, pc, regs); | |
1695 | ftrace_trace_userstack(buffer, flags, pc); | |
1696 | } | |
0d5c6e1c | 1697 | EXPORT_SYMBOL_GPL(trace_buffer_unlock_commit_regs); |
1fd8df2c | 1698 | |
e77405ad SR |
1699 | void trace_current_buffer_discard_commit(struct ring_buffer *buffer, |
1700 | struct ring_buffer_event *event) | |
77d9f465 | 1701 | { |
e77405ad | 1702 | ring_buffer_discard_commit(buffer, event); |
ef5580d0 | 1703 | } |
12acd473 | 1704 | EXPORT_SYMBOL_GPL(trace_current_buffer_discard_commit); |
ef5580d0 | 1705 | |
e309b41d | 1706 | void |
7be42151 | 1707 | trace_function(struct trace_array *tr, |
38697053 SR |
1708 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
1709 | int pc) | |
bc0c38d1 | 1710 | { |
e1112b4d | 1711 | struct ftrace_event_call *call = &event_function; |
12883efb | 1712 | struct ring_buffer *buffer = tr->trace_buffer.buffer; |
3928a8a2 | 1713 | struct ring_buffer_event *event; |
777e208d | 1714 | struct ftrace_entry *entry; |
bc0c38d1 | 1715 | |
d769041f | 1716 | /* If we are reading the ring buffer, don't trace */ |
dd17c8f7 | 1717 | if (unlikely(__this_cpu_read(ftrace_cpu_disabled))) |
d769041f SR |
1718 | return; |
1719 | ||
e77405ad | 1720 | event = trace_buffer_lock_reserve(buffer, TRACE_FN, sizeof(*entry), |
51a763dd | 1721 | flags, pc); |
3928a8a2 SR |
1722 | if (!event) |
1723 | return; | |
1724 | entry = ring_buffer_event_data(event); | |
777e208d SR |
1725 | entry->ip = ip; |
1726 | entry->parent_ip = parent_ip; | |
e1112b4d | 1727 | |
e77405ad | 1728 | if (!filter_check_discard(call, entry, buffer, event)) |
7ffbd48d | 1729 | __buffer_unlock_commit(buffer, event); |
bc0c38d1 SR |
1730 | } |
1731 | ||
e309b41d | 1732 | void |
2e0f5761 | 1733 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
38697053 SR |
1734 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
1735 | int pc) | |
2e0f5761 IM |
1736 | { |
1737 | if (likely(!atomic_read(&data->disabled))) | |
7be42151 | 1738 | trace_function(tr, ip, parent_ip, flags, pc); |
2e0f5761 IM |
1739 | } |
1740 | ||
c0a0d0d3 | 1741 | #ifdef CONFIG_STACKTRACE |
4a9bd3f1 SR |
1742 | |
1743 | #define FTRACE_STACK_MAX_ENTRIES (PAGE_SIZE / sizeof(unsigned long)) | |
1744 | struct ftrace_stack { | |
1745 | unsigned long calls[FTRACE_STACK_MAX_ENTRIES]; | |
1746 | }; | |
1747 | ||
1748 | static DEFINE_PER_CPU(struct ftrace_stack, ftrace_stack); | |
1749 | static DEFINE_PER_CPU(int, ftrace_stack_reserve); | |
1750 | ||
e77405ad | 1751 | static void __ftrace_trace_stack(struct ring_buffer *buffer, |
53614991 | 1752 | unsigned long flags, |
1fd8df2c | 1753 | int skip, int pc, struct pt_regs *regs) |
86387f7e | 1754 | { |
e1112b4d | 1755 | struct ftrace_event_call *call = &event_kernel_stack; |
3928a8a2 | 1756 | struct ring_buffer_event *event; |
777e208d | 1757 | struct stack_entry *entry; |
86387f7e | 1758 | struct stack_trace trace; |
4a9bd3f1 SR |
1759 | int use_stack; |
1760 | int size = FTRACE_STACK_ENTRIES; | |
1761 | ||
1762 | trace.nr_entries = 0; | |
1763 | trace.skip = skip; | |
1764 | ||
1765 | /* | |
1766 | * Since events can happen in NMIs there's no safe way to | |
1767 | * use the per cpu ftrace_stacks. We reserve it and if an interrupt | |
1768 | * or NMI comes in, it will just have to use the default | |
1769 | * FTRACE_STACK_SIZE. | |
1770 | */ | |
1771 | preempt_disable_notrace(); | |
1772 | ||
82146529 | 1773 | use_stack = __this_cpu_inc_return(ftrace_stack_reserve); |
4a9bd3f1 SR |
1774 | /* |
1775 | * We don't need any atomic variables, just a barrier. | |
1776 | * If an interrupt comes in, we don't care, because it would | |
1777 | * have exited and put the counter back to what we want. | |
1778 | * We just need a barrier to keep gcc from moving things | |
1779 | * around. | |
1780 | */ | |
1781 | barrier(); | |
1782 | if (use_stack == 1) { | |
1783 | trace.entries = &__get_cpu_var(ftrace_stack).calls[0]; | |
1784 | trace.max_entries = FTRACE_STACK_MAX_ENTRIES; | |
1785 | ||
1786 | if (regs) | |
1787 | save_stack_trace_regs(regs, &trace); | |
1788 | else | |
1789 | save_stack_trace(&trace); | |
1790 | ||
1791 | if (trace.nr_entries > size) | |
1792 | size = trace.nr_entries; | |
1793 | } else | |
1794 | /* From now on, use_stack is a boolean */ | |
1795 | use_stack = 0; | |
1796 | ||
1797 | size *= sizeof(unsigned long); | |
86387f7e | 1798 | |
e77405ad | 1799 | event = trace_buffer_lock_reserve(buffer, TRACE_STACK, |
4a9bd3f1 | 1800 | sizeof(*entry) + size, flags, pc); |
3928a8a2 | 1801 | if (!event) |
4a9bd3f1 SR |
1802 | goto out; |
1803 | entry = ring_buffer_event_data(event); | |
86387f7e | 1804 | |
4a9bd3f1 SR |
1805 | memset(&entry->caller, 0, size); |
1806 | ||
1807 | if (use_stack) | |
1808 | memcpy(&entry->caller, trace.entries, | |
1809 | trace.nr_entries * sizeof(unsigned long)); | |
1810 | else { | |
1811 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
1812 | trace.entries = entry->caller; | |
1813 | if (regs) | |
1814 | save_stack_trace_regs(regs, &trace); | |
1815 | else | |
1816 | save_stack_trace(&trace); | |
1817 | } | |
1818 | ||
1819 | entry->size = trace.nr_entries; | |
86387f7e | 1820 | |
e77405ad | 1821 | if (!filter_check_discard(call, entry, buffer, event)) |
7ffbd48d | 1822 | __buffer_unlock_commit(buffer, event); |
4a9bd3f1 SR |
1823 | |
1824 | out: | |
1825 | /* Again, don't let gcc optimize things here */ | |
1826 | barrier(); | |
82146529 | 1827 | __this_cpu_dec(ftrace_stack_reserve); |
4a9bd3f1 SR |
1828 | preempt_enable_notrace(); |
1829 | ||
f0a920d5 IM |
1830 | } |
1831 | ||
1fd8df2c MH |
1832 | void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags, |
1833 | int skip, int pc, struct pt_regs *regs) | |
1834 | { | |
1835 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) | |
1836 | return; | |
1837 | ||
1838 | __ftrace_trace_stack(buffer, flags, skip, pc, regs); | |
1839 | } | |
1840 | ||
e77405ad SR |
1841 | void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags, |
1842 | int skip, int pc) | |
53614991 SR |
1843 | { |
1844 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) | |
1845 | return; | |
1846 | ||
1fd8df2c | 1847 | __ftrace_trace_stack(buffer, flags, skip, pc, NULL); |
53614991 SR |
1848 | } |
1849 | ||
c0a0d0d3 FW |
1850 | void __trace_stack(struct trace_array *tr, unsigned long flags, int skip, |
1851 | int pc) | |
38697053 | 1852 | { |
12883efb | 1853 | __ftrace_trace_stack(tr->trace_buffer.buffer, flags, skip, pc, NULL); |
38697053 SR |
1854 | } |
1855 | ||
03889384 SR |
1856 | /** |
1857 | * trace_dump_stack - record a stack back trace in the trace buffer | |
c142be8e | 1858 | * @skip: Number of functions to skip (helper handlers) |
03889384 | 1859 | */ |
c142be8e | 1860 | void trace_dump_stack(int skip) |
03889384 SR |
1861 | { |
1862 | unsigned long flags; | |
1863 | ||
1864 | if (tracing_disabled || tracing_selftest_running) | |
e36c5458 | 1865 | return; |
03889384 SR |
1866 | |
1867 | local_save_flags(flags); | |
1868 | ||
c142be8e SRRH |
1869 | /* |
1870 | * Skip 3 more, seems to get us at the caller of | |
1871 | * this function. | |
1872 | */ | |
1873 | skip += 3; | |
1874 | __ftrace_trace_stack(global_trace.trace_buffer.buffer, | |
1875 | flags, skip, preempt_count(), NULL); | |
03889384 SR |
1876 | } |
1877 | ||
91e86e56 SR |
1878 | static DEFINE_PER_CPU(int, user_stack_count); |
1879 | ||
e77405ad SR |
1880 | void |
1881 | ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, int pc) | |
02b67518 | 1882 | { |
e1112b4d | 1883 | struct ftrace_event_call *call = &event_user_stack; |
8d7c6a96 | 1884 | struct ring_buffer_event *event; |
02b67518 TE |
1885 | struct userstack_entry *entry; |
1886 | struct stack_trace trace; | |
02b67518 TE |
1887 | |
1888 | if (!(trace_flags & TRACE_ITER_USERSTACKTRACE)) | |
1889 | return; | |
1890 | ||
b6345879 SR |
1891 | /* |
1892 | * NMIs can not handle page faults, even with fix ups. | |
1893 | * The save user stack can (and often does) fault. | |
1894 | */ | |
1895 | if (unlikely(in_nmi())) | |
1896 | return; | |
02b67518 | 1897 | |
91e86e56 SR |
1898 | /* |
1899 | * prevent recursion, since the user stack tracing may | |
1900 | * trigger other kernel events. | |
1901 | */ | |
1902 | preempt_disable(); | |
1903 | if (__this_cpu_read(user_stack_count)) | |
1904 | goto out; | |
1905 | ||
1906 | __this_cpu_inc(user_stack_count); | |
1907 | ||
e77405ad | 1908 | event = trace_buffer_lock_reserve(buffer, TRACE_USER_STACK, |
51a763dd | 1909 | sizeof(*entry), flags, pc); |
02b67518 | 1910 | if (!event) |
1dbd1951 | 1911 | goto out_drop_count; |
02b67518 | 1912 | entry = ring_buffer_event_data(event); |
02b67518 | 1913 | |
48659d31 | 1914 | entry->tgid = current->tgid; |
02b67518 TE |
1915 | memset(&entry->caller, 0, sizeof(entry->caller)); |
1916 | ||
1917 | trace.nr_entries = 0; | |
1918 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
1919 | trace.skip = 0; | |
1920 | trace.entries = entry->caller; | |
1921 | ||
1922 | save_stack_trace_user(&trace); | |
e77405ad | 1923 | if (!filter_check_discard(call, entry, buffer, event)) |
7ffbd48d | 1924 | __buffer_unlock_commit(buffer, event); |
91e86e56 | 1925 | |
1dbd1951 | 1926 | out_drop_count: |
91e86e56 | 1927 | __this_cpu_dec(user_stack_count); |
91e86e56 SR |
1928 | out: |
1929 | preempt_enable(); | |
02b67518 TE |
1930 | } |
1931 | ||
4fd27358 HE |
1932 | #ifdef UNUSED |
1933 | static void __trace_userstack(struct trace_array *tr, unsigned long flags) | |
02b67518 | 1934 | { |
7be42151 | 1935 | ftrace_trace_userstack(tr, flags, preempt_count()); |
02b67518 | 1936 | } |
4fd27358 | 1937 | #endif /* UNUSED */ |
02b67518 | 1938 | |
c0a0d0d3 FW |
1939 | #endif /* CONFIG_STACKTRACE */ |
1940 | ||
07d777fe SR |
1941 | /* created for use with alloc_percpu */ |
1942 | struct trace_buffer_struct { | |
1943 | char buffer[TRACE_BUF_SIZE]; | |
1944 | }; | |
1945 | ||
1946 | static struct trace_buffer_struct *trace_percpu_buffer; | |
1947 | static struct trace_buffer_struct *trace_percpu_sirq_buffer; | |
1948 | static struct trace_buffer_struct *trace_percpu_irq_buffer; | |
1949 | static struct trace_buffer_struct *trace_percpu_nmi_buffer; | |
1950 | ||
1951 | /* | |
1952 | * The buffer used is dependent on the context. There is a per cpu | |
1953 | * buffer for normal context, softirq contex, hard irq context and | |
1954 | * for NMI context. Thise allows for lockless recording. | |
1955 | * | |
1956 | * Note, if the buffers failed to be allocated, then this returns NULL | |
1957 | */ | |
1958 | static char *get_trace_buf(void) | |
1959 | { | |
1960 | struct trace_buffer_struct *percpu_buffer; | |
07d777fe SR |
1961 | |
1962 | /* | |
1963 | * If we have allocated per cpu buffers, then we do not | |
1964 | * need to do any locking. | |
1965 | */ | |
1966 | if (in_nmi()) | |
1967 | percpu_buffer = trace_percpu_nmi_buffer; | |
1968 | else if (in_irq()) | |
1969 | percpu_buffer = trace_percpu_irq_buffer; | |
1970 | else if (in_softirq()) | |
1971 | percpu_buffer = trace_percpu_sirq_buffer; | |
1972 | else | |
1973 | percpu_buffer = trace_percpu_buffer; | |
1974 | ||
1975 | if (!percpu_buffer) | |
1976 | return NULL; | |
1977 | ||
d8a0349c | 1978 | return this_cpu_ptr(&percpu_buffer->buffer[0]); |
07d777fe SR |
1979 | } |
1980 | ||
1981 | static int alloc_percpu_trace_buffer(void) | |
1982 | { | |
1983 | struct trace_buffer_struct *buffers; | |
1984 | struct trace_buffer_struct *sirq_buffers; | |
1985 | struct trace_buffer_struct *irq_buffers; | |
1986 | struct trace_buffer_struct *nmi_buffers; | |
1987 | ||
1988 | buffers = alloc_percpu(struct trace_buffer_struct); | |
1989 | if (!buffers) | |
1990 | goto err_warn; | |
1991 | ||
1992 | sirq_buffers = alloc_percpu(struct trace_buffer_struct); | |
1993 | if (!sirq_buffers) | |
1994 | goto err_sirq; | |
1995 | ||
1996 | irq_buffers = alloc_percpu(struct trace_buffer_struct); | |
1997 | if (!irq_buffers) | |
1998 | goto err_irq; | |
1999 | ||
2000 | nmi_buffers = alloc_percpu(struct trace_buffer_struct); | |
2001 | if (!nmi_buffers) | |
2002 | goto err_nmi; | |
2003 | ||
2004 | trace_percpu_buffer = buffers; | |
2005 | trace_percpu_sirq_buffer = sirq_buffers; | |
2006 | trace_percpu_irq_buffer = irq_buffers; | |
2007 | trace_percpu_nmi_buffer = nmi_buffers; | |
2008 | ||
2009 | return 0; | |
2010 | ||
2011 | err_nmi: | |
2012 | free_percpu(irq_buffers); | |
2013 | err_irq: | |
2014 | free_percpu(sirq_buffers); | |
2015 | err_sirq: | |
2016 | free_percpu(buffers); | |
2017 | err_warn: | |
2018 | WARN(1, "Could not allocate percpu trace_printk buffer"); | |
2019 | return -ENOMEM; | |
2020 | } | |
2021 | ||
81698831 SR |
2022 | static int buffers_allocated; |
2023 | ||
07d777fe SR |
2024 | void trace_printk_init_buffers(void) |
2025 | { | |
07d777fe SR |
2026 | if (buffers_allocated) |
2027 | return; | |
2028 | ||
2029 | if (alloc_percpu_trace_buffer()) | |
2030 | return; | |
2031 | ||
2032 | pr_info("ftrace: Allocated trace_printk buffers\n"); | |
2033 | ||
b382ede6 | 2034 | /* Expand the buffers to set size */ |
6fa3eb70 S |
2035 | /* M: avoid to expand buffer because of trace_printk in kernel */ |
2036 | /* tracing_update_buffers(); */ | |
b382ede6 | 2037 | |
07d777fe | 2038 | buffers_allocated = 1; |
81698831 SR |
2039 | |
2040 | /* | |
2041 | * trace_printk_init_buffers() can be called by modules. | |
2042 | * If that happens, then we need to start cmdline recording | |
2043 | * directly here. If the global_trace.buffer is already | |
2044 | * allocated here, then this was called by module code. | |
2045 | */ | |
12883efb | 2046 | if (global_trace.trace_buffer.buffer) |
81698831 SR |
2047 | tracing_start_cmdline_record(); |
2048 | } | |
2049 | ||
2050 | void trace_printk_start_comm(void) | |
2051 | { | |
2052 | /* Start tracing comms if trace printk is set */ | |
2053 | if (!buffers_allocated) | |
2054 | return; | |
2055 | tracing_start_cmdline_record(); | |
2056 | } | |
2057 | ||
2058 | static void trace_printk_start_stop_comm(int enabled) | |
2059 | { | |
2060 | if (!buffers_allocated) | |
2061 | return; | |
2062 | ||
2063 | if (enabled) | |
2064 | tracing_start_cmdline_record(); | |
2065 | else | |
2066 | tracing_stop_cmdline_record(); | |
07d777fe SR |
2067 | } |
2068 | ||
769b0441 | 2069 | /** |
48ead020 | 2070 | * trace_vbprintk - write binary msg to tracing buffer |
769b0441 FW |
2071 | * |
2072 | */ | |
40ce74f1 | 2073 | int trace_vbprintk(unsigned long ip, const char *fmt, va_list args) |
769b0441 | 2074 | { |
e1112b4d | 2075 | struct ftrace_event_call *call = &event_bprint; |
769b0441 | 2076 | struct ring_buffer_event *event; |
e77405ad | 2077 | struct ring_buffer *buffer; |
769b0441 | 2078 | struct trace_array *tr = &global_trace; |
48ead020 | 2079 | struct bprint_entry *entry; |
769b0441 | 2080 | unsigned long flags; |
07d777fe SR |
2081 | char *tbuffer; |
2082 | int len = 0, size, pc; | |
769b0441 FW |
2083 | |
2084 | if (unlikely(tracing_selftest_running || tracing_disabled)) | |
2085 | return 0; | |
2086 | ||
2087 | /* Don't pollute graph traces with trace_vprintk internals */ | |
2088 | pause_graph_tracing(); | |
2089 | ||
2090 | pc = preempt_count(); | |
5168ae50 | 2091 | preempt_disable_notrace(); |
769b0441 | 2092 | |
07d777fe SR |
2093 | tbuffer = get_trace_buf(); |
2094 | if (!tbuffer) { | |
2095 | len = 0; | |
769b0441 | 2096 | goto out; |
07d777fe | 2097 | } |
769b0441 | 2098 | |
07d777fe | 2099 | len = vbin_printf((u32 *)tbuffer, TRACE_BUF_SIZE/sizeof(int), fmt, args); |
769b0441 | 2100 | |
07d777fe SR |
2101 | if (len > TRACE_BUF_SIZE/sizeof(int) || len < 0) |
2102 | goto out; | |
769b0441 | 2103 | |
07d777fe | 2104 | local_save_flags(flags); |
769b0441 | 2105 | size = sizeof(*entry) + sizeof(u32) * len; |
12883efb | 2106 | buffer = tr->trace_buffer.buffer; |
e77405ad SR |
2107 | event = trace_buffer_lock_reserve(buffer, TRACE_BPRINT, size, |
2108 | flags, pc); | |
769b0441 | 2109 | if (!event) |
07d777fe | 2110 | goto out; |
769b0441 FW |
2111 | entry = ring_buffer_event_data(event); |
2112 | entry->ip = ip; | |
769b0441 FW |
2113 | entry->fmt = fmt; |
2114 | ||
07d777fe | 2115 | memcpy(entry->buf, tbuffer, sizeof(u32) * len); |
d931369b | 2116 | if (!filter_check_discard(call, entry, buffer, event)) { |
7ffbd48d | 2117 | __buffer_unlock_commit(buffer, event); |
d931369b SR |
2118 | ftrace_trace_stack(buffer, flags, 6, pc); |
2119 | } | |
769b0441 | 2120 | |
769b0441 | 2121 | out: |
5168ae50 | 2122 | preempt_enable_notrace(); |
769b0441 FW |
2123 | unpause_graph_tracing(); |
2124 | ||
2125 | return len; | |
2126 | } | |
48ead020 FW |
2127 | EXPORT_SYMBOL_GPL(trace_vbprintk); |
2128 | ||
12883efb SRRH |
2129 | static int |
2130 | __trace_array_vprintk(struct ring_buffer *buffer, | |
2131 | unsigned long ip, const char *fmt, va_list args) | |
48ead020 | 2132 | { |
e1112b4d | 2133 | struct ftrace_event_call *call = &event_print; |
48ead020 | 2134 | struct ring_buffer_event *event; |
07d777fe | 2135 | int len = 0, size, pc; |
48ead020 | 2136 | struct print_entry *entry; |
07d777fe SR |
2137 | unsigned long flags; |
2138 | char *tbuffer; | |
48ead020 FW |
2139 | |
2140 | if (tracing_disabled || tracing_selftest_running) | |
2141 | return 0; | |
2142 | ||
07d777fe SR |
2143 | /* Don't pollute graph traces with trace_vprintk internals */ |
2144 | pause_graph_tracing(); | |
2145 | ||
48ead020 FW |
2146 | pc = preempt_count(); |
2147 | preempt_disable_notrace(); | |
48ead020 | 2148 | |
07d777fe SR |
2149 | |
2150 | tbuffer = get_trace_buf(); | |
2151 | if (!tbuffer) { | |
2152 | len = 0; | |
48ead020 | 2153 | goto out; |
07d777fe | 2154 | } |
48ead020 | 2155 | |
07d777fe SR |
2156 | len = vsnprintf(tbuffer, TRACE_BUF_SIZE, fmt, args); |
2157 | if (len > TRACE_BUF_SIZE) | |
2158 | goto out; | |
48ead020 | 2159 | |
07d777fe | 2160 | local_save_flags(flags); |
48ead020 | 2161 | size = sizeof(*entry) + len + 1; |
e77405ad | 2162 | event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, size, |
07d777fe | 2163 | flags, pc); |
48ead020 | 2164 | if (!event) |
07d777fe | 2165 | goto out; |
48ead020 | 2166 | entry = ring_buffer_event_data(event); |
c13d2f7c | 2167 | entry->ip = ip; |
48ead020 | 2168 | |
07d777fe | 2169 | memcpy(&entry->buf, tbuffer, len); |
c13d2f7c | 2170 | entry->buf[len] = '\0'; |
d931369b | 2171 | if (!filter_check_discard(call, entry, buffer, event)) { |
7ffbd48d | 2172 | __buffer_unlock_commit(buffer, event); |
07d777fe | 2173 | ftrace_trace_stack(buffer, flags, 6, pc); |
d931369b | 2174 | } |
48ead020 FW |
2175 | out: |
2176 | preempt_enable_notrace(); | |
07d777fe | 2177 | unpause_graph_tracing(); |
48ead020 FW |
2178 | |
2179 | return len; | |
2180 | } | |
659372d3 | 2181 | |
12883efb SRRH |
2182 | int trace_array_vprintk(struct trace_array *tr, |
2183 | unsigned long ip, const char *fmt, va_list args) | |
2184 | { | |
2185 | return __trace_array_vprintk(tr->trace_buffer.buffer, ip, fmt, args); | |
2186 | } | |
2187 | ||
2188 | int trace_array_printk(struct trace_array *tr, | |
2189 | unsigned long ip, const char *fmt, ...) | |
2190 | { | |
2191 | int ret; | |
2192 | va_list ap; | |
2193 | ||
2194 | if (!(trace_flags & TRACE_ITER_PRINTK)) | |
2195 | return 0; | |
2196 | ||
2197 | va_start(ap, fmt); | |
2198 | ret = trace_array_vprintk(tr, ip, fmt, ap); | |
2199 | va_end(ap); | |
2200 | return ret; | |
2201 | } | |
2202 | ||
2203 | int trace_array_printk_buf(struct ring_buffer *buffer, | |
2204 | unsigned long ip, const char *fmt, ...) | |
2205 | { | |
2206 | int ret; | |
2207 | va_list ap; | |
2208 | ||
2209 | if (!(trace_flags & TRACE_ITER_PRINTK)) | |
2210 | return 0; | |
2211 | ||
2212 | va_start(ap, fmt); | |
2213 | ret = __trace_array_vprintk(buffer, ip, fmt, ap); | |
2214 | va_end(ap); | |
2215 | return ret; | |
2216 | } | |
2217 | ||
659372d3 SR |
2218 | int trace_vprintk(unsigned long ip, const char *fmt, va_list args) |
2219 | { | |
a813a159 | 2220 | return trace_array_vprintk(&global_trace, ip, fmt, args); |
659372d3 | 2221 | } |
769b0441 FW |
2222 | EXPORT_SYMBOL_GPL(trace_vprintk); |
2223 | ||
e2ac8ef5 | 2224 | static void trace_iterator_increment(struct trace_iterator *iter) |
5a90f577 | 2225 | { |
6d158a81 SR |
2226 | struct ring_buffer_iter *buf_iter = trace_buffer_iter(iter, iter->cpu); |
2227 | ||
5a90f577 | 2228 | iter->idx++; |
6d158a81 SR |
2229 | if (buf_iter) |
2230 | ring_buffer_read(buf_iter, NULL); | |
5a90f577 SR |
2231 | } |
2232 | ||
e309b41d | 2233 | static struct trace_entry * |
bc21b478 SR |
2234 | peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts, |
2235 | unsigned long *lost_events) | |
dd0e545f | 2236 | { |
3928a8a2 | 2237 | struct ring_buffer_event *event; |
6d158a81 | 2238 | struct ring_buffer_iter *buf_iter = trace_buffer_iter(iter, cpu); |
dd0e545f | 2239 | |
d769041f SR |
2240 | if (buf_iter) |
2241 | event = ring_buffer_iter_peek(buf_iter, ts); | |
2242 | else | |
12883efb | 2243 | event = ring_buffer_peek(iter->trace_buffer->buffer, cpu, ts, |
bc21b478 | 2244 | lost_events); |
d769041f | 2245 | |
4a9bd3f1 SR |
2246 | if (event) { |
2247 | iter->ent_size = ring_buffer_event_length(event); | |
2248 | return ring_buffer_event_data(event); | |
2249 | } | |
2250 | iter->ent_size = 0; | |
2251 | return NULL; | |
dd0e545f | 2252 | } |
d769041f | 2253 | |
dd0e545f | 2254 | static struct trace_entry * |
bc21b478 SR |
2255 | __find_next_entry(struct trace_iterator *iter, int *ent_cpu, |
2256 | unsigned long *missing_events, u64 *ent_ts) | |
bc0c38d1 | 2257 | { |
12883efb | 2258 | struct ring_buffer *buffer = iter->trace_buffer->buffer; |
bc0c38d1 | 2259 | struct trace_entry *ent, *next = NULL; |
aa27497c | 2260 | unsigned long lost_events = 0, next_lost = 0; |
b04cc6b1 | 2261 | int cpu_file = iter->cpu_file; |
3928a8a2 | 2262 | u64 next_ts = 0, ts; |
bc0c38d1 | 2263 | int next_cpu = -1; |
12b5da34 | 2264 | int next_size = 0; |
bc0c38d1 SR |
2265 | int cpu; |
2266 | ||
b04cc6b1 FW |
2267 | /* |
2268 | * If we are in a per_cpu trace file, don't bother by iterating over | |
2269 | * all cpu and peek directly. | |
2270 | */ | |
ae3b5093 | 2271 | if (cpu_file > RING_BUFFER_ALL_CPUS) { |
b04cc6b1 FW |
2272 | if (ring_buffer_empty_cpu(buffer, cpu_file)) |
2273 | return NULL; | |
bc21b478 | 2274 | ent = peek_next_entry(iter, cpu_file, ent_ts, missing_events); |
b04cc6b1 FW |
2275 | if (ent_cpu) |
2276 | *ent_cpu = cpu_file; | |
2277 | ||
2278 | return ent; | |
2279 | } | |
2280 | ||
ab46428c | 2281 | for_each_tracing_cpu(cpu) { |
dd0e545f | 2282 | |
3928a8a2 SR |
2283 | if (ring_buffer_empty_cpu(buffer, cpu)) |
2284 | continue; | |
dd0e545f | 2285 | |
bc21b478 | 2286 | ent = peek_next_entry(iter, cpu, &ts, &lost_events); |
dd0e545f | 2287 | |
cdd31cd2 IM |
2288 | /* |
2289 | * Pick the entry with the smallest timestamp: | |
2290 | */ | |
3928a8a2 | 2291 | if (ent && (!next || ts < next_ts)) { |
bc0c38d1 SR |
2292 | next = ent; |
2293 | next_cpu = cpu; | |
3928a8a2 | 2294 | next_ts = ts; |
bc21b478 | 2295 | next_lost = lost_events; |
12b5da34 | 2296 | next_size = iter->ent_size; |
bc0c38d1 SR |
2297 | } |
2298 | } | |
2299 | ||
12b5da34 SR |
2300 | iter->ent_size = next_size; |
2301 | ||
bc0c38d1 SR |
2302 | if (ent_cpu) |
2303 | *ent_cpu = next_cpu; | |
2304 | ||
3928a8a2 SR |
2305 | if (ent_ts) |
2306 | *ent_ts = next_ts; | |
2307 | ||
bc21b478 SR |
2308 | if (missing_events) |
2309 | *missing_events = next_lost; | |
2310 | ||
bc0c38d1 SR |
2311 | return next; |
2312 | } | |
2313 | ||
dd0e545f | 2314 | /* Find the next real entry, without updating the iterator itself */ |
c4a8e8be FW |
2315 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, |
2316 | int *ent_cpu, u64 *ent_ts) | |
bc0c38d1 | 2317 | { |
bc21b478 | 2318 | return __find_next_entry(iter, ent_cpu, NULL, ent_ts); |
dd0e545f SR |
2319 | } |
2320 | ||
2321 | /* Find the next real entry, and increment the iterator to the next entry */ | |
955b61e5 | 2322 | void *trace_find_next_entry_inc(struct trace_iterator *iter) |
dd0e545f | 2323 | { |
bc21b478 SR |
2324 | iter->ent = __find_next_entry(iter, &iter->cpu, |
2325 | &iter->lost_events, &iter->ts); | |
dd0e545f | 2326 | |
3928a8a2 | 2327 | if (iter->ent) |
e2ac8ef5 | 2328 | trace_iterator_increment(iter); |
dd0e545f | 2329 | |
3928a8a2 | 2330 | return iter->ent ? iter : NULL; |
b3806b43 | 2331 | } |
bc0c38d1 | 2332 | |
e309b41d | 2333 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 | 2334 | { |
12883efb | 2335 | ring_buffer_consume(iter->trace_buffer->buffer, iter->cpu, &iter->ts, |
bc21b478 | 2336 | &iter->lost_events); |
bc0c38d1 SR |
2337 | } |
2338 | ||
e309b41d | 2339 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
2340 | { |
2341 | struct trace_iterator *iter = m->private; | |
bc0c38d1 | 2342 | int i = (int)*pos; |
4e3c3333 | 2343 | void *ent; |
bc0c38d1 | 2344 | |
a63ce5b3 SR |
2345 | WARN_ON_ONCE(iter->leftover); |
2346 | ||
bc0c38d1 SR |
2347 | (*pos)++; |
2348 | ||
2349 | /* can't go backwards */ | |
2350 | if (iter->idx > i) | |
2351 | return NULL; | |
2352 | ||
2353 | if (iter->idx < 0) | |
955b61e5 | 2354 | ent = trace_find_next_entry_inc(iter); |
bc0c38d1 SR |
2355 | else |
2356 | ent = iter; | |
2357 | ||
2358 | while (ent && iter->idx < i) | |
955b61e5 | 2359 | ent = trace_find_next_entry_inc(iter); |
bc0c38d1 SR |
2360 | |
2361 | iter->pos = *pos; | |
2362 | ||
bc0c38d1 SR |
2363 | return ent; |
2364 | } | |
2365 | ||
955b61e5 | 2366 | void tracing_iter_reset(struct trace_iterator *iter, int cpu) |
2f26ebd5 | 2367 | { |
2f26ebd5 SR |
2368 | struct ring_buffer_event *event; |
2369 | struct ring_buffer_iter *buf_iter; | |
2370 | unsigned long entries = 0; | |
2371 | u64 ts; | |
2372 | ||
12883efb | 2373 | per_cpu_ptr(iter->trace_buffer->data, cpu)->skipped_entries = 0; |
2f26ebd5 | 2374 | |
6d158a81 SR |
2375 | buf_iter = trace_buffer_iter(iter, cpu); |
2376 | if (!buf_iter) | |
2f26ebd5 SR |
2377 | return; |
2378 | ||
2f26ebd5 SR |
2379 | ring_buffer_iter_reset(buf_iter); |
2380 | ||
2381 | /* | |
2382 | * We could have the case with the max latency tracers | |
2383 | * that a reset never took place on a cpu. This is evident | |
2384 | * by the timestamp being before the start of the buffer. | |
2385 | */ | |
2386 | while ((event = ring_buffer_iter_peek(buf_iter, &ts))) { | |
12883efb | 2387 | if (ts >= iter->trace_buffer->time_start) |
2f26ebd5 SR |
2388 | break; |
2389 | entries++; | |
2390 | ring_buffer_read(buf_iter, NULL); | |
2391 | } | |
2392 | ||
12883efb | 2393 | per_cpu_ptr(iter->trace_buffer->data, cpu)->skipped_entries = entries; |
2f26ebd5 SR |
2394 | } |
2395 | ||
d7350c3f | 2396 | /* |
d7350c3f FW |
2397 | * The current tracer is copied to avoid a global locking |
2398 | * all around. | |
2399 | */ | |
bc0c38d1 SR |
2400 | static void *s_start(struct seq_file *m, loff_t *pos) |
2401 | { | |
2402 | struct trace_iterator *iter = m->private; | |
2b6080f2 | 2403 | struct trace_array *tr = iter->tr; |
b04cc6b1 | 2404 | int cpu_file = iter->cpu_file; |
bc0c38d1 SR |
2405 | void *p = NULL; |
2406 | loff_t l = 0; | |
3928a8a2 | 2407 | int cpu; |
bc0c38d1 | 2408 | |
2fd196ec HT |
2409 | /* |
2410 | * copy the tracer to avoid using a global lock all around. | |
2411 | * iter->trace is a copy of current_trace, the pointer to the | |
2412 | * name may be used instead of a strcmp(), as iter->trace->name | |
2413 | * will point to the same string as current_trace->name. | |
2414 | */ | |
bc0c38d1 | 2415 | mutex_lock(&trace_types_lock); |
2b6080f2 SR |
2416 | if (unlikely(tr->current_trace && iter->trace->name != tr->current_trace->name)) |
2417 | *iter->trace = *tr->current_trace; | |
d7350c3f | 2418 | mutex_unlock(&trace_types_lock); |
bc0c38d1 | 2419 | |
12883efb | 2420 | #ifdef CONFIG_TRACER_MAX_TRACE |
debdd57f HT |
2421 | if (iter->snapshot && iter->trace->use_max_tr) |
2422 | return ERR_PTR(-EBUSY); | |
12883efb | 2423 | #endif |
debdd57f HT |
2424 | |
2425 | if (!iter->snapshot) | |
2426 | atomic_inc(&trace_record_cmdline_disabled); | |
bc0c38d1 | 2427 | |
bc0c38d1 SR |
2428 | if (*pos != iter->pos) { |
2429 | iter->ent = NULL; | |
2430 | iter->cpu = 0; | |
2431 | iter->idx = -1; | |
2432 | ||
ae3b5093 | 2433 | if (cpu_file == RING_BUFFER_ALL_CPUS) { |
b04cc6b1 | 2434 | for_each_tracing_cpu(cpu) |
2f26ebd5 | 2435 | tracing_iter_reset(iter, cpu); |
b04cc6b1 | 2436 | } else |
2f26ebd5 | 2437 | tracing_iter_reset(iter, cpu_file); |
bc0c38d1 | 2438 | |
ac91d854 | 2439 | iter->leftover = 0; |
bc0c38d1 SR |
2440 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
2441 | ; | |
2442 | ||
2443 | } else { | |
a63ce5b3 SR |
2444 | /* |
2445 | * If we overflowed the seq_file before, then we want | |
2446 | * to just reuse the trace_seq buffer again. | |
2447 | */ | |
2448 | if (iter->leftover) | |
2449 | p = iter; | |
2450 | else { | |
2451 | l = *pos - 1; | |
2452 | p = s_next(m, p, &l); | |
2453 | } | |
bc0c38d1 SR |
2454 | } |
2455 | ||
4f535968 | 2456 | trace_event_read_lock(); |
7e53bd42 | 2457 | trace_access_lock(cpu_file); |
bc0c38d1 SR |
2458 | return p; |
2459 | } | |
2460 | ||
2461 | static void s_stop(struct seq_file *m, void *p) | |
2462 | { | |
7e53bd42 LJ |
2463 | struct trace_iterator *iter = m->private; |
2464 | ||
12883efb | 2465 | #ifdef CONFIG_TRACER_MAX_TRACE |
debdd57f HT |
2466 | if (iter->snapshot && iter->trace->use_max_tr) |
2467 | return; | |
12883efb | 2468 | #endif |
debdd57f HT |
2469 | |
2470 | if (!iter->snapshot) | |
2471 | atomic_dec(&trace_record_cmdline_disabled); | |
12883efb | 2472 | |
7e53bd42 | 2473 | trace_access_unlock(iter->cpu_file); |
4f535968 | 2474 | trace_event_read_unlock(); |
bc0c38d1 SR |
2475 | } |
2476 | ||
39eaf7ef | 2477 | static void |
12883efb SRRH |
2478 | get_total_entries(struct trace_buffer *buf, |
2479 | unsigned long *total, unsigned long *entries) | |
39eaf7ef SR |
2480 | { |
2481 | unsigned long count; | |
2482 | int cpu; | |
2483 | ||
2484 | *total = 0; | |
2485 | *entries = 0; | |
2486 | ||
2487 | for_each_tracing_cpu(cpu) { | |
12883efb | 2488 | count = ring_buffer_entries_cpu(buf->buffer, cpu); |
39eaf7ef SR |
2489 | /* |
2490 | * If this buffer has skipped entries, then we hold all | |
2491 | * entries for the trace and we need to ignore the | |
2492 | * ones before the time stamp. | |
2493 | */ | |
12883efb SRRH |
2494 | if (per_cpu_ptr(buf->data, cpu)->skipped_entries) { |
2495 | count -= per_cpu_ptr(buf->data, cpu)->skipped_entries; | |
39eaf7ef SR |
2496 | /* total is the same as the entries */ |
2497 | *total += count; | |
2498 | } else | |
2499 | *total += count + | |
12883efb | 2500 | ring_buffer_overrun_cpu(buf->buffer, cpu); |
39eaf7ef SR |
2501 | *entries += count; |
2502 | } | |
2503 | } | |
2504 | ||
e309b41d | 2505 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 | 2506 | { |
a6168353 ME |
2507 | seq_puts(m, "# _------=> CPU# \n"); |
2508 | seq_puts(m, "# / _-----=> irqs-off \n"); | |
2509 | seq_puts(m, "# | / _----=> need-resched \n"); | |
2510 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); | |
2511 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); | |
e6e1e259 SR |
2512 | seq_puts(m, "# |||| / delay \n"); |
2513 | seq_puts(m, "# cmd pid ||||| time | caller \n"); | |
2514 | seq_puts(m, "# \\ / ||||| \\ | / \n"); | |
bc0c38d1 SR |
2515 | } |
2516 | ||
12883efb | 2517 | static void print_event_info(struct trace_buffer *buf, struct seq_file *m) |
bc0c38d1 | 2518 | { |
39eaf7ef SR |
2519 | unsigned long total; |
2520 | unsigned long entries; | |
2521 | ||
12883efb | 2522 | get_total_entries(buf, &total, &entries); |
39eaf7ef SR |
2523 | seq_printf(m, "# entries-in-buffer/entries-written: %lu/%lu #P:%d\n", |
2524 | entries, total, num_online_cpus()); | |
6fa3eb70 S |
2525 | #ifdef CONFIG_MTK_SCHED_TRACERS |
2526 | print_enabled_events(m); | |
2527 | #endif | |
39eaf7ef SR |
2528 | seq_puts(m, "#\n"); |
2529 | } | |
2530 | ||
12883efb | 2531 | static void print_func_help_header(struct trace_buffer *buf, struct seq_file *m) |
39eaf7ef | 2532 | { |
12883efb | 2533 | print_event_info(buf, m); |
77271ce4 | 2534 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
a6168353 | 2535 | seq_puts(m, "# | | | | |\n"); |
bc0c38d1 SR |
2536 | } |
2537 | ||
6fa3eb70 S |
2538 | static void print_func_help_header_tgid(struct trace_buffer *buf, struct seq_file *m) |
2539 | { | |
2540 | print_event_info(buf, m); | |
2541 | seq_puts(m, "# TASK-PID TGID CPU# TIMESTAMP FUNCTION\n"); | |
2542 | seq_puts(m, "# | | | | | |\n"); | |
2543 | } | |
2544 | ||
12883efb | 2545 | static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file *m) |
77271ce4 | 2546 | { |
12883efb | 2547 | print_event_info(buf, m); |
77271ce4 SR |
2548 | seq_puts(m, "# _-----=> irqs-off\n"); |
2549 | seq_puts(m, "# / _----=> need-resched\n"); | |
2550 | seq_puts(m, "# | / _---=> hardirq/softirq\n"); | |
2551 | seq_puts(m, "# || / _--=> preempt-depth\n"); | |
2552 | seq_puts(m, "# ||| / delay\n"); | |
2553 | seq_puts(m, "# TASK-PID CPU# |||| TIMESTAMP FUNCTION\n"); | |
2554 | seq_puts(m, "# | | | |||| | |\n"); | |
2555 | } | |
bc0c38d1 | 2556 | |
6fa3eb70 S |
2557 | static void print_func_help_header_irq_tgid(struct trace_buffer *buf, struct seq_file *m) |
2558 | { | |
2559 | print_event_info(buf, m); | |
2560 | seq_puts(m, "# _-----=> irqs-off\n"); | |
2561 | seq_puts(m, "# / _----=> need-resched\n"); | |
2562 | seq_puts(m, "# | / _---=> hardirq/softirq\n"); | |
2563 | seq_puts(m, "# || / _--=> preempt-depth\n"); | |
2564 | seq_puts(m, "# ||| / delay\n"); | |
2565 | seq_puts(m, "# TASK-PID TGID CPU# |||| TIMESTAMP FUNCTION\n"); | |
2566 | seq_puts(m, "# | | | | |||| | |\n"); | |
2567 | } | |
2568 | ||
62b915f1 | 2569 | void |
bc0c38d1 SR |
2570 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
2571 | { | |
2572 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); | |
12883efb SRRH |
2573 | struct trace_buffer *buf = iter->trace_buffer; |
2574 | struct trace_array_cpu *data = per_cpu_ptr(buf->data, buf->cpu); | |
2b6080f2 | 2575 | struct tracer *type = iter->trace; |
39eaf7ef SR |
2576 | unsigned long entries; |
2577 | unsigned long total; | |
bc0c38d1 SR |
2578 | const char *name = "preemption"; |
2579 | ||
d840f718 | 2580 | name = type->name; |
bc0c38d1 | 2581 | |
12883efb | 2582 | get_total_entries(buf, &total, &entries); |
bc0c38d1 | 2583 | |
888b55dc | 2584 | seq_printf(m, "# %s latency trace v1.1.5 on %s\n", |
bc0c38d1 | 2585 | name, UTS_RELEASE); |
888b55dc | 2586 | seq_puts(m, "# -----------------------------------" |
bc0c38d1 | 2587 | "---------------------------------\n"); |
888b55dc | 2588 | seq_printf(m, "# latency: %lu us, #%lu/%lu, CPU#%d |" |
bc0c38d1 | 2589 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", |
57f50be1 | 2590 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 2591 | entries, |
4c11d7ae | 2592 | total, |
12883efb | 2593 | buf->cpu, |
bc0c38d1 SR |
2594 | #if defined(CONFIG_PREEMPT_NONE) |
2595 | "server", | |
2596 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
2597 | "desktop", | |
b5c21b45 | 2598 | #elif defined(CONFIG_PREEMPT) |
bc0c38d1 SR |
2599 | "preempt", |
2600 | #else | |
2601 | "unknown", | |
2602 | #endif | |
2603 | /* These are reserved for later use */ | |
2604 | 0, 0, 0, 0); | |
2605 | #ifdef CONFIG_SMP | |
2606 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
2607 | #else | |
2608 | seq_puts(m, ")\n"); | |
2609 | #endif | |
888b55dc KM |
2610 | seq_puts(m, "# -----------------\n"); |
2611 | seq_printf(m, "# | task: %.16s-%d " | |
bc0c38d1 | 2612 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", |
d20b92ab EB |
2613 | data->comm, data->pid, |
2614 | from_kuid_munged(seq_user_ns(m), data->uid), data->nice, | |
bc0c38d1 | 2615 | data->policy, data->rt_priority); |
888b55dc | 2616 | seq_puts(m, "# -----------------\n"); |
bc0c38d1 SR |
2617 | |
2618 | if (data->critical_start) { | |
888b55dc | 2619 | seq_puts(m, "# => started at: "); |
214023c3 SR |
2620 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
2621 | trace_print_seq(m, &iter->seq); | |
888b55dc | 2622 | seq_puts(m, "\n# => ended at: "); |
214023c3 SR |
2623 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
2624 | trace_print_seq(m, &iter->seq); | |
8248ac05 | 2625 | seq_puts(m, "\n#\n"); |
bc0c38d1 SR |
2626 | } |
2627 | ||
888b55dc | 2628 | seq_puts(m, "#\n"); |
bc0c38d1 SR |
2629 | } |
2630 | ||
a309720c SR |
2631 | static void test_cpu_buff_start(struct trace_iterator *iter) |
2632 | { | |
2633 | struct trace_seq *s = &iter->seq; | |
2634 | ||
12ef7d44 SR |
2635 | if (!(trace_flags & TRACE_ITER_ANNOTATE)) |
2636 | return; | |
2637 | ||
2638 | if (!(iter->iter_flags & TRACE_FILE_ANNOTATE)) | |
2639 | return; | |
2640 | ||
4462344e | 2641 | if (cpumask_test_cpu(iter->cpu, iter->started)) |
a309720c SR |
2642 | return; |
2643 | ||
12883efb | 2644 | if (per_cpu_ptr(iter->trace_buffer->data, iter->cpu)->skipped_entries) |
2f26ebd5 SR |
2645 | return; |
2646 | ||
4462344e | 2647 | cpumask_set_cpu(iter->cpu, iter->started); |
b0dfa978 FW |
2648 | |
2649 | /* Don't print started cpu buffer for the first entry of the trace */ | |
2650 | if (iter->idx > 1) | |
2651 | trace_seq_printf(s, "##### CPU %u buffer started ####\n", | |
2652 | iter->cpu); | |
a309720c SR |
2653 | } |
2654 | ||
2c4f035f | 2655 | static enum print_line_t print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 2656 | { |
214023c3 | 2657 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 2658 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 2659 | struct trace_entry *entry; |
f633cef0 | 2660 | struct trace_event *event; |
bc0c38d1 | 2661 | |
4e3c3333 | 2662 | entry = iter->ent; |
dd0e545f | 2663 | |
a309720c SR |
2664 | test_cpu_buff_start(iter); |
2665 | ||
c4a8e8be | 2666 | event = ftrace_find_event(entry->type); |
bc0c38d1 | 2667 | |
c4a8e8be | 2668 | if (trace_flags & TRACE_ITER_CONTEXT_INFO) { |
27d48be8 SR |
2669 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { |
2670 | if (!trace_print_lat_context(iter)) | |
2671 | goto partial; | |
2672 | } else { | |
2673 | if (!trace_print_context(iter)) | |
2674 | goto partial; | |
2675 | } | |
c4a8e8be | 2676 | } |
bc0c38d1 | 2677 | |
268ccda0 | 2678 | if (event) |
a9a57763 | 2679 | return event->funcs->trace(iter, sym_flags, event); |
d9793bd8 ACM |
2680 | |
2681 | if (!trace_seq_printf(s, "Unknown type %d\n", entry->type)) | |
2682 | goto partial; | |
02b67518 | 2683 | |
2c4f035f | 2684 | return TRACE_TYPE_HANDLED; |
d9793bd8 ACM |
2685 | partial: |
2686 | return TRACE_TYPE_PARTIAL_LINE; | |
bc0c38d1 SR |
2687 | } |
2688 | ||
2c4f035f | 2689 | static enum print_line_t print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 IM |
2690 | { |
2691 | struct trace_seq *s = &iter->seq; | |
2692 | struct trace_entry *entry; | |
f633cef0 | 2693 | struct trace_event *event; |
f9896bf3 IM |
2694 | |
2695 | entry = iter->ent; | |
dd0e545f | 2696 | |
c4a8e8be | 2697 | if (trace_flags & TRACE_ITER_CONTEXT_INFO) { |
d9793bd8 ACM |
2698 | if (!trace_seq_printf(s, "%d %d %llu ", |
2699 | entry->pid, iter->cpu, iter->ts)) | |
2700 | goto partial; | |
c4a8e8be | 2701 | } |
f9896bf3 | 2702 | |
f633cef0 | 2703 | event = ftrace_find_event(entry->type); |
268ccda0 | 2704 | if (event) |
a9a57763 | 2705 | return event->funcs->raw(iter, 0, event); |
d9793bd8 ACM |
2706 | |
2707 | if (!trace_seq_printf(s, "%d ?\n", entry->type)) | |
2708 | goto partial; | |
777e208d | 2709 | |
2c4f035f | 2710 | return TRACE_TYPE_HANDLED; |
d9793bd8 ACM |
2711 | partial: |
2712 | return TRACE_TYPE_PARTIAL_LINE; | |
f9896bf3 IM |
2713 | } |
2714 | ||
2c4f035f | 2715 | static enum print_line_t print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec IM |
2716 | { |
2717 | struct trace_seq *s = &iter->seq; | |
2718 | unsigned char newline = '\n'; | |
2719 | struct trace_entry *entry; | |
f633cef0 | 2720 | struct trace_event *event; |
5e3ca0ec IM |
2721 | |
2722 | entry = iter->ent; | |
dd0e545f | 2723 | |
c4a8e8be FW |
2724 | if (trace_flags & TRACE_ITER_CONTEXT_INFO) { |
2725 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); | |
2726 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); | |
2727 | SEQ_PUT_HEX_FIELD_RET(s, iter->ts); | |
2728 | } | |
5e3ca0ec | 2729 | |
f633cef0 | 2730 | event = ftrace_find_event(entry->type); |
268ccda0 | 2731 | if (event) { |
a9a57763 | 2732 | enum print_line_t ret = event->funcs->hex(iter, 0, event); |
d9793bd8 ACM |
2733 | if (ret != TRACE_TYPE_HANDLED) |
2734 | return ret; | |
2735 | } | |
7104f300 | 2736 | |
5e3ca0ec IM |
2737 | SEQ_PUT_FIELD_RET(s, newline); |
2738 | ||
2c4f035f | 2739 | return TRACE_TYPE_HANDLED; |
5e3ca0ec IM |
2740 | } |
2741 | ||
2c4f035f | 2742 | static enum print_line_t print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa IM |
2743 | { |
2744 | struct trace_seq *s = &iter->seq; | |
2745 | struct trace_entry *entry; | |
f633cef0 | 2746 | struct trace_event *event; |
cb0f12aa IM |
2747 | |
2748 | entry = iter->ent; | |
dd0e545f | 2749 | |
c4a8e8be FW |
2750 | if (trace_flags & TRACE_ITER_CONTEXT_INFO) { |
2751 | SEQ_PUT_FIELD_RET(s, entry->pid); | |
1830b52d | 2752 | SEQ_PUT_FIELD_RET(s, iter->cpu); |
c4a8e8be FW |
2753 | SEQ_PUT_FIELD_RET(s, iter->ts); |
2754 | } | |
cb0f12aa | 2755 | |
f633cef0 | 2756 | event = ftrace_find_event(entry->type); |
a9a57763 SR |
2757 | return event ? event->funcs->binary(iter, 0, event) : |
2758 | TRACE_TYPE_HANDLED; | |
cb0f12aa IM |
2759 | } |
2760 | ||
62b915f1 | 2761 | int trace_empty(struct trace_iterator *iter) |
bc0c38d1 | 2762 | { |
6d158a81 | 2763 | struct ring_buffer_iter *buf_iter; |
bc0c38d1 SR |
2764 | int cpu; |
2765 | ||
9aba60fe | 2766 | /* If we are looking at one CPU buffer, only check that one */ |
ae3b5093 | 2767 | if (iter->cpu_file != RING_BUFFER_ALL_CPUS) { |
9aba60fe | 2768 | cpu = iter->cpu_file; |
6d158a81 SR |
2769 | buf_iter = trace_buffer_iter(iter, cpu); |
2770 | if (buf_iter) { | |
2771 | if (!ring_buffer_iter_empty(buf_iter)) | |
9aba60fe SR |
2772 | return 0; |
2773 | } else { | |
12883efb | 2774 | if (!ring_buffer_empty_cpu(iter->trace_buffer->buffer, cpu)) |
9aba60fe SR |
2775 | return 0; |
2776 | } | |
2777 | return 1; | |
2778 | } | |
2779 | ||
ab46428c | 2780 | for_each_tracing_cpu(cpu) { |
6d158a81 SR |
2781 | buf_iter = trace_buffer_iter(iter, cpu); |
2782 | if (buf_iter) { | |
2783 | if (!ring_buffer_iter_empty(buf_iter)) | |
d769041f SR |
2784 | return 0; |
2785 | } else { | |
12883efb | 2786 | if (!ring_buffer_empty_cpu(iter->trace_buffer->buffer, cpu)) |
d769041f SR |
2787 | return 0; |
2788 | } | |
bc0c38d1 | 2789 | } |
d769041f | 2790 | |
797d3712 | 2791 | return 1; |
bc0c38d1 SR |
2792 | } |
2793 | ||
4f535968 | 2794 | /* Called with trace_event_read_lock() held. */ |
955b61e5 | 2795 | enum print_line_t print_trace_line(struct trace_iterator *iter) |
f9896bf3 | 2796 | { |
2c4f035f FW |
2797 | enum print_line_t ret; |
2798 | ||
ee5e51f5 JO |
2799 | if (iter->lost_events && |
2800 | !trace_seq_printf(&iter->seq, "CPU:%d [LOST %lu EVENTS]\n", | |
2801 | iter->cpu, iter->lost_events)) | |
2802 | return TRACE_TYPE_PARTIAL_LINE; | |
bc21b478 | 2803 | |
2c4f035f FW |
2804 | if (iter->trace && iter->trace->print_line) { |
2805 | ret = iter->trace->print_line(iter); | |
2806 | if (ret != TRACE_TYPE_UNHANDLED) | |
2807 | return ret; | |
2808 | } | |
72829bc3 | 2809 | |
09ae7234 SRRH |
2810 | if (iter->ent->type == TRACE_BPUTS && |
2811 | trace_flags & TRACE_ITER_PRINTK && | |
2812 | trace_flags & TRACE_ITER_PRINTK_MSGONLY) | |
2813 | return trace_print_bputs_msg_only(iter); | |
2814 | ||
48ead020 FW |
2815 | if (iter->ent->type == TRACE_BPRINT && |
2816 | trace_flags & TRACE_ITER_PRINTK && | |
2817 | trace_flags & TRACE_ITER_PRINTK_MSGONLY) | |
5ef841f6 | 2818 | return trace_print_bprintk_msg_only(iter); |
48ead020 | 2819 | |
66896a85 FW |
2820 | if (iter->ent->type == TRACE_PRINT && |
2821 | trace_flags & TRACE_ITER_PRINTK && | |
2822 | trace_flags & TRACE_ITER_PRINTK_MSGONLY) | |
5ef841f6 | 2823 | return trace_print_printk_msg_only(iter); |
66896a85 | 2824 | |
cb0f12aa IM |
2825 | if (trace_flags & TRACE_ITER_BIN) |
2826 | return print_bin_fmt(iter); | |
2827 | ||
5e3ca0ec IM |
2828 | if (trace_flags & TRACE_ITER_HEX) |
2829 | return print_hex_fmt(iter); | |
2830 | ||
f9896bf3 IM |
2831 | if (trace_flags & TRACE_ITER_RAW) |
2832 | return print_raw_fmt(iter); | |
2833 | ||
f9896bf3 IM |
2834 | return print_trace_fmt(iter); |
2835 | } | |
2836 | ||
7e9a49ef JO |
2837 | void trace_latency_header(struct seq_file *m) |
2838 | { | |
2839 | struct trace_iterator *iter = m->private; | |
2840 | ||
2841 | /* print nothing if the buffers are empty */ | |
2842 | if (trace_empty(iter)) | |
2843 | return; | |
2844 | ||
2845 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
2846 | print_trace_header(m, iter); | |
2847 | ||
2848 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
2849 | print_lat_help_header(m); | |
2850 | } | |
2851 | ||
62b915f1 JO |
2852 | void trace_default_header(struct seq_file *m) |
2853 | { | |
2854 | struct trace_iterator *iter = m->private; | |
2855 | ||
f56e7f8e JO |
2856 | if (!(trace_flags & TRACE_ITER_CONTEXT_INFO)) |
2857 | return; | |
2858 | ||
62b915f1 JO |
2859 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { |
2860 | /* print nothing if the buffers are empty */ | |
2861 | if (trace_empty(iter)) | |
2862 | return; | |
2863 | print_trace_header(m, iter); | |
2864 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
2865 | print_lat_help_header(m); | |
2866 | } else { | |
77271ce4 SR |
2867 | if (!(trace_flags & TRACE_ITER_VERBOSE)) { |
2868 | if (trace_flags & TRACE_ITER_IRQ_INFO) | |
6fa3eb70 S |
2869 | if (trace_flags & TRACE_ITER_TGID) |
2870 | print_func_help_header_irq_tgid(iter->trace_buffer, m); | |
2871 | else | |
2872 | print_func_help_header_irq(iter->trace_buffer, m); | |
77271ce4 | 2873 | else |
6fa3eb70 S |
2874 | if (trace_flags & TRACE_ITER_TGID) |
2875 | print_func_help_header_tgid(iter->trace_buffer, m); | |
2876 | else | |
2877 | print_func_help_header(iter->trace_buffer, m); | |
77271ce4 | 2878 | } |
62b915f1 JO |
2879 | } |
2880 | } | |
2881 | ||
e0a413f6 SR |
2882 | static void test_ftrace_alive(struct seq_file *m) |
2883 | { | |
2884 | if (!ftrace_is_dead()) | |
2885 | return; | |
2886 | seq_printf(m, "# WARNING: FUNCTION TRACING IS CORRUPTED\n"); | |
2887 | seq_printf(m, "# MAY BE MISSING FUNCTION EVENTS\n"); | |
2888 | } | |
2889 | ||
d8741e2e | 2890 | #ifdef CONFIG_TRACER_MAX_TRACE |
f1affcaa | 2891 | static void show_snapshot_main_help(struct seq_file *m) |
d8741e2e | 2892 | { |
d8741e2e SRRH |
2893 | seq_printf(m, "# echo 0 > snapshot : Clears and frees snapshot buffer\n"); |
2894 | seq_printf(m, "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n"); | |
2895 | seq_printf(m, "# Takes a snapshot of the main buffer.\n"); | |
2896 | seq_printf(m, "# echo 2 > snapshot : Clears snapshot buffer (but does not allocate)\n"); | |
2897 | seq_printf(m, "# (Doesn't have to be '2' works with any number that\n"); | |
2898 | seq_printf(m, "# is not a '0' or '1')\n"); | |
2899 | } | |
f1affcaa SRRH |
2900 | |
2901 | static void show_snapshot_percpu_help(struct seq_file *m) | |
2902 | { | |
2903 | seq_printf(m, "# echo 0 > snapshot : Invalid for per_cpu snapshot file.\n"); | |
2904 | #ifdef CONFIG_RING_BUFFER_ALLOW_SWAP | |
2905 | seq_printf(m, "# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.\n"); | |
2906 | seq_printf(m, "# Takes a snapshot of the main buffer for this cpu.\n"); | |
2907 | #else | |
2908 | seq_printf(m, "# echo 1 > snapshot : Not supported with this kernel.\n"); | |
2909 | seq_printf(m, "# Must use main snapshot file to allocate.\n"); | |
2910 | #endif | |
2911 | seq_printf(m, "# echo 2 > snapshot : Clears this cpu's snapshot buffer (but does not allocate)\n"); | |
2912 | seq_printf(m, "# (Doesn't have to be '2' works with any number that\n"); | |
2913 | seq_printf(m, "# is not a '0' or '1')\n"); | |
2914 | } | |
2915 | ||
d8741e2e SRRH |
2916 | static void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter) |
2917 | { | |
45ad21ca | 2918 | if (iter->tr->allocated_snapshot) |
d8741e2e SRRH |
2919 | seq_printf(m, "#\n# * Snapshot is allocated *\n#\n"); |
2920 | else | |
2921 | seq_printf(m, "#\n# * Snapshot is freed *\n#\n"); | |
2922 | ||
2923 | seq_printf(m, "# Snapshot commands:\n"); | |
f1affcaa SRRH |
2924 | if (iter->cpu_file == RING_BUFFER_ALL_CPUS) |
2925 | show_snapshot_main_help(m); | |
2926 | else | |
2927 | show_snapshot_percpu_help(m); | |
d8741e2e SRRH |
2928 | } |
2929 | #else | |
2930 | /* Should never be called */ | |
2931 | static inline void print_snapshot_help(struct seq_file *m, struct trace_iterator *iter) { } | |
2932 | #endif | |
2933 | ||
bc0c38d1 SR |
2934 | static int s_show(struct seq_file *m, void *v) |
2935 | { | |
2936 | struct trace_iterator *iter = v; | |
a63ce5b3 | 2937 | int ret; |
bc0c38d1 SR |
2938 | |
2939 | if (iter->ent == NULL) { | |
2940 | if (iter->tr) { | |
2941 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
2942 | seq_puts(m, "#\n"); | |
e0a413f6 | 2943 | test_ftrace_alive(m); |
bc0c38d1 | 2944 | } |
d8741e2e SRRH |
2945 | if (iter->snapshot && trace_empty(iter)) |
2946 | print_snapshot_help(m, iter); | |
2947 | else if (iter->trace && iter->trace->print_header) | |
8bba1bf5 | 2948 | iter->trace->print_header(m); |
62b915f1 JO |
2949 | else |
2950 | trace_default_header(m); | |
2951 | ||
a63ce5b3 SR |
2952 | } else if (iter->leftover) { |
2953 | /* | |
2954 | * If we filled the seq_file buffer earlier, we | |
2955 | * want to just show it now. | |
2956 | */ | |
2957 | ret = trace_print_seq(m, &iter->seq); | |
2958 | ||
2959 | /* ret should this time be zero, but you never know */ | |
2960 | iter->leftover = ret; | |
2961 | ||
bc0c38d1 | 2962 | } else { |
f9896bf3 | 2963 | print_trace_line(iter); |
a63ce5b3 SR |
2964 | ret = trace_print_seq(m, &iter->seq); |
2965 | /* | |
2966 | * If we overflow the seq_file buffer, then it will | |
2967 | * ask us for this data again at start up. | |
2968 | * Use that instead. | |
2969 | * ret is 0 if seq_file write succeeded. | |
2970 | * -1 otherwise. | |
2971 | */ | |
2972 | iter->leftover = ret; | |
bc0c38d1 SR |
2973 | } |
2974 | ||
2975 | return 0; | |
2976 | } | |
2977 | ||
e2d4dbe0 ON |
2978 | /* |
2979 | * Should be used after trace_array_get(), trace_types_lock | |
2980 | * ensures that i_cdev was already initialized. | |
2981 | */ | |
2982 | static inline int tracing_get_cpu(struct inode *inode) | |
2983 | { | |
2984 | if (inode->i_cdev) /* See trace_create_cpu_file() */ | |
2985 | return (long)inode->i_cdev - 1; | |
2986 | return RING_BUFFER_ALL_CPUS; | |
2987 | } | |
2988 | ||
88e9d34c | 2989 | static const struct seq_operations tracer_seq_ops = { |
4bf39a94 IM |
2990 | .start = s_start, |
2991 | .next = s_next, | |
2992 | .stop = s_stop, | |
2993 | .show = s_show, | |
bc0c38d1 SR |
2994 | }; |
2995 | ||
e309b41d | 2996 | static struct trace_iterator * |
7272711a | 2997 | __tracing_open(struct inode *inode, struct file *file, bool snapshot) |
bc0c38d1 | 2998 | { |
7272711a | 2999 | struct trace_array *tr = inode->i_private; |
bc0c38d1 | 3000 | struct trace_iterator *iter; |
50e18b94 | 3001 | int cpu; |
bc0c38d1 | 3002 | |
85a2f9b4 SR |
3003 | if (tracing_disabled) |
3004 | return ERR_PTR(-ENODEV); | |
60a11774 | 3005 | |
50e18b94 | 3006 | iter = __seq_open_private(file, &tracer_seq_ops, sizeof(*iter)); |
85a2f9b4 SR |
3007 | if (!iter) |
3008 | return ERR_PTR(-ENOMEM); | |
bc0c38d1 | 3009 | |
6d158a81 SR |
3010 | iter->buffer_iter = kzalloc(sizeof(*iter->buffer_iter) * num_possible_cpus(), |
3011 | GFP_KERNEL); | |
93574fcc DC |
3012 | if (!iter->buffer_iter) |
3013 | goto release; | |
3014 | ||
d7350c3f FW |
3015 | /* |
3016 | * We make a copy of the current tracer to avoid concurrent | |
3017 | * changes on it while we are reading. | |
3018 | */ | |
bc0c38d1 | 3019 | mutex_lock(&trace_types_lock); |
d7350c3f | 3020 | iter->trace = kzalloc(sizeof(*iter->trace), GFP_KERNEL); |
85a2f9b4 | 3021 | if (!iter->trace) |
d7350c3f | 3022 | goto fail; |
85a2f9b4 | 3023 | |
2b6080f2 | 3024 | *iter->trace = *tr->current_trace; |
d7350c3f | 3025 | |
79f55997 | 3026 | if (!zalloc_cpumask_var(&iter->started, GFP_KERNEL)) |
b0dfa978 FW |
3027 | goto fail; |
3028 | ||
12883efb SRRH |
3029 | iter->tr = tr; |
3030 | ||
3031 | #ifdef CONFIG_TRACER_MAX_TRACE | |
2b6080f2 SR |
3032 | /* Currently only the top directory has a snapshot */ |
3033 | if (tr->current_trace->print_max || snapshot) | |
12883efb | 3034 | iter->trace_buffer = &tr->max_buffer; |
bc0c38d1 | 3035 | else |
12883efb SRRH |
3036 | #endif |
3037 | iter->trace_buffer = &tr->trace_buffer; | |
debdd57f | 3038 | iter->snapshot = snapshot; |
bc0c38d1 | 3039 | iter->pos = -1; |
7272711a | 3040 | iter->cpu_file = tracing_get_cpu(inode); |
d7350c3f | 3041 | mutex_init(&iter->mutex); |
bc0c38d1 | 3042 | |
8bba1bf5 MM |
3043 | /* Notify the tracer early; before we stop tracing. */ |
3044 | if (iter->trace && iter->trace->open) | |
a93751ca | 3045 | iter->trace->open(iter); |
8bba1bf5 | 3046 | |
12ef7d44 | 3047 | /* Annotate start of buffers if we had overruns */ |
12883efb | 3048 | if (ring_buffer_overruns(iter->trace_buffer->buffer)) |
12ef7d44 SR |
3049 | iter->iter_flags |= TRACE_FILE_ANNOTATE; |
3050 | ||
8be0709f | 3051 | /* Output in nanoseconds only if we are using a clock in nanoseconds. */ |
58e8eedf | 3052 | if (trace_clocks[tr->clock_id].in_ns) |
8be0709f DS |
3053 | iter->iter_flags |= TRACE_FILE_TIME_IN_NS; |
3054 | ||
debdd57f HT |
3055 | /* stop the trace while dumping if we are not opening "snapshot" */ |
3056 | if (!iter->snapshot) | |
2b6080f2 | 3057 | tracing_stop_tr(tr); |
2f26ebd5 | 3058 | |
ae3b5093 | 3059 | if (iter->cpu_file == RING_BUFFER_ALL_CPUS) { |
b04cc6b1 | 3060 | for_each_tracing_cpu(cpu) { |
b04cc6b1 | 3061 | iter->buffer_iter[cpu] = |
12883efb | 3062 | ring_buffer_read_prepare(iter->trace_buffer->buffer, cpu); |
72c9ddfd DM |
3063 | } |
3064 | ring_buffer_read_prepare_sync(); | |
3065 | for_each_tracing_cpu(cpu) { | |
3066 | ring_buffer_read_start(iter->buffer_iter[cpu]); | |
2f26ebd5 | 3067 | tracing_iter_reset(iter, cpu); |
b04cc6b1 FW |
3068 | } |
3069 | } else { | |
3070 | cpu = iter->cpu_file; | |
3928a8a2 | 3071 | iter->buffer_iter[cpu] = |
12883efb | 3072 | ring_buffer_read_prepare(iter->trace_buffer->buffer, cpu); |
72c9ddfd DM |
3073 | ring_buffer_read_prepare_sync(); |
3074 | ring_buffer_read_start(iter->buffer_iter[cpu]); | |
2f26ebd5 | 3075 | tracing_iter_reset(iter, cpu); |
3928a8a2 SR |
3076 | } |
3077 | ||
bc0c38d1 SR |
3078 | mutex_unlock(&trace_types_lock); |
3079 | ||
bc0c38d1 | 3080 | return iter; |
3928a8a2 | 3081 | |
d7350c3f | 3082 | fail: |
3928a8a2 | 3083 | mutex_unlock(&trace_types_lock); |
d7350c3f | 3084 | kfree(iter->trace); |
6d158a81 | 3085 | kfree(iter->buffer_iter); |
93574fcc | 3086 | release: |
50e18b94 JO |
3087 | seq_release_private(inode, file); |
3088 | return ERR_PTR(-ENOMEM); | |
bc0c38d1 SR |
3089 | } |
3090 | ||
3091 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
3092 | { | |
60a11774 SR |
3093 | if (tracing_disabled) |
3094 | return -ENODEV; | |
3095 | ||
bc0c38d1 SR |
3096 | filp->private_data = inode->i_private; |
3097 | return 0; | |
3098 | } | |
3099 | ||
6492334c SRRH |
3100 | /* |
3101 | * Open and update trace_array ref count. | |
3102 | * Must have the current trace_array passed to it. | |
3103 | */ | |
3104 | int tracing_open_generic_tr(struct inode *inode, struct file *filp) | |
3105 | { | |
3106 | struct trace_array *tr = inode->i_private; | |
3107 | ||
3108 | if (tracing_disabled) | |
3109 | return -ENODEV; | |
3110 | ||
3111 | if (trace_array_get(tr) < 0) | |
3112 | return -ENODEV; | |
3113 | ||
3114 | filp->private_data = inode->i_private; | |
3115 | ||
3116 | return 0; | |
6492334c SRRH |
3117 | } |
3118 | ||
4fd27358 | 3119 | static int tracing_release(struct inode *inode, struct file *file) |
bc0c38d1 | 3120 | { |
7272711a | 3121 | struct trace_array *tr = inode->i_private; |
907f2784 | 3122 | struct seq_file *m = file->private_data; |
4acd4d00 | 3123 | struct trace_iterator *iter; |
3928a8a2 | 3124 | int cpu; |
bc0c38d1 | 3125 | |
59d8f488 | 3126 | if (!(file->f_mode & FMODE_READ)) { |
7272711a | 3127 | trace_array_put(tr); |
4acd4d00 | 3128 | return 0; |
59d8f488 | 3129 | } |
4acd4d00 | 3130 | |
7272711a | 3131 | /* Writes do not use seq_file */ |
4acd4d00 | 3132 | iter = m->private; |
bc0c38d1 | 3133 | mutex_lock(&trace_types_lock); |
a695cb58 | 3134 | |
3928a8a2 SR |
3135 | for_each_tracing_cpu(cpu) { |
3136 | if (iter->buffer_iter[cpu]) | |
3137 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
3138 | } | |
3139 | ||
bc0c38d1 SR |
3140 | if (iter->trace && iter->trace->close) |
3141 | iter->trace->close(iter); | |
3142 | ||
6fa3eb70 | 3143 | printk(KERN_INFO "[ftrace]end reading trace file\n"); |
debdd57f HT |
3144 | if (!iter->snapshot) |
3145 | /* reenable tracing if it was previously enabled */ | |
2b6080f2 | 3146 | tracing_start_tr(tr); |
e45ccd09 AL |
3147 | |
3148 | __trace_array_put(tr); | |
3149 | ||
bc0c38d1 SR |
3150 | mutex_unlock(&trace_types_lock); |
3151 | ||
d7350c3f | 3152 | mutex_destroy(&iter->mutex); |
b0dfa978 | 3153 | free_cpumask_var(iter->started); |
d7350c3f | 3154 | kfree(iter->trace); |
6d158a81 | 3155 | kfree(iter->buffer_iter); |
50e18b94 | 3156 | seq_release_private(inode, file); |
59d8f488 | 3157 | |
bc0c38d1 SR |
3158 | return 0; |
3159 | } | |
3160 | ||
6492334c SRRH |
3161 | static int tracing_release_generic_tr(struct inode *inode, struct file *file) |
3162 | { | |
3163 | struct trace_array *tr = inode->i_private; | |
3164 | ||
3165 | trace_array_put(tr); | |
3166 | return 0; | |
3167 | } | |
3168 | ||
6492334c SRRH |
3169 | static int tracing_single_release_tr(struct inode *inode, struct file *file) |
3170 | { | |
3171 | struct trace_array *tr = inode->i_private; | |
3172 | ||
3173 | trace_array_put(tr); | |
3174 | ||
3175 | return single_release(inode, file); | |
3176 | } | |
3177 | ||
bc0c38d1 SR |
3178 | static int tracing_open(struct inode *inode, struct file *file) |
3179 | { | |
7272711a | 3180 | struct trace_array *tr = inode->i_private; |
85a2f9b4 SR |
3181 | struct trace_iterator *iter; |
3182 | int ret = 0; | |
bc0c38d1 | 3183 | |
59d8f488 SRRH |
3184 | if (trace_array_get(tr) < 0) |
3185 | return -ENODEV; | |
3186 | ||
4acd4d00 | 3187 | /* If this file was open for write, then erase contents */ |
7272711a ON |
3188 | if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) { |
3189 | int cpu = tracing_get_cpu(inode); | |
7210062e BY |
3190 | struct trace_buffer *trace_buf = &tr->trace_buffer; |
3191 | ||
3192 | #ifdef CONFIG_TRACER_MAX_TRACE | |
3193 | if (tr->current_trace->print_max) | |
3194 | trace_buf = &tr->max_buffer; | |
3195 | #endif | |
7272711a ON |
3196 | |
3197 | if (cpu == RING_BUFFER_ALL_CPUS) | |
7210062e | 3198 | tracing_reset_online_cpus(trace_buf); |
4acd4d00 | 3199 | else |
7210062e | 3200 | tracing_reset(trace_buf, cpu); |
4acd4d00 | 3201 | } |
bc0c38d1 | 3202 | |
4acd4d00 | 3203 | if (file->f_mode & FMODE_READ) { |
6fa3eb70 | 3204 | printk(KERN_INFO "[ftrace]start reading trace file\n"); |
7272711a | 3205 | iter = __tracing_open(inode, file, false); |
4acd4d00 SR |
3206 | if (IS_ERR(iter)) |
3207 | ret = PTR_ERR(iter); | |
3208 | else if (trace_flags & TRACE_ITER_LATENCY_FMT) | |
3209 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
3210 | } | |
59d8f488 SRRH |
3211 | |
3212 | if (ret < 0) | |
3213 | trace_array_put(tr); | |
3214 | ||
bc0c38d1 SR |
3215 | return ret; |
3216 | } | |
3217 | ||
e309b41d | 3218 | static void * |
bc0c38d1 SR |
3219 | t_next(struct seq_file *m, void *v, loff_t *pos) |
3220 | { | |
f129e965 | 3221 | struct tracer *t = v; |
bc0c38d1 SR |
3222 | |
3223 | (*pos)++; | |
3224 | ||
3225 | if (t) | |
3226 | t = t->next; | |
3227 | ||
bc0c38d1 SR |
3228 | return t; |
3229 | } | |
3230 | ||
3231 | static void *t_start(struct seq_file *m, loff_t *pos) | |
3232 | { | |
f129e965 | 3233 | struct tracer *t; |
bc0c38d1 SR |
3234 | loff_t l = 0; |
3235 | ||
3236 | mutex_lock(&trace_types_lock); | |
f129e965 | 3237 | for (t = trace_types; t && l < *pos; t = t_next(m, t, &l)) |
bc0c38d1 SR |
3238 | ; |
3239 | ||
3240 | return t; | |
3241 | } | |
3242 | ||
3243 | static void t_stop(struct seq_file *m, void *p) | |
3244 | { | |
3245 | mutex_unlock(&trace_types_lock); | |
3246 | } | |
3247 | ||
3248 | static int t_show(struct seq_file *m, void *v) | |
3249 | { | |
3250 | struct tracer *t = v; | |
3251 | ||
3252 | if (!t) | |
3253 | return 0; | |
3254 | ||
3255 | seq_printf(m, "%s", t->name); | |
3256 | if (t->next) | |
3257 | seq_putc(m, ' '); | |
3258 | else | |
3259 | seq_putc(m, '\n'); | |
3260 | ||
3261 | return 0; | |
3262 | } | |
3263 | ||
88e9d34c | 3264 | static const struct seq_operations show_traces_seq_ops = { |
4bf39a94 IM |
3265 | .start = t_start, |
3266 | .next = t_next, | |
3267 | .stop = t_stop, | |
3268 | .show = t_show, | |
bc0c38d1 SR |
3269 | }; |
3270 | ||
3271 | static int show_traces_open(struct inode *inode, struct file *file) | |
3272 | { | |
60a11774 SR |
3273 | if (tracing_disabled) |
3274 | return -ENODEV; | |
3275 | ||
f129e965 | 3276 | return seq_open(file, &show_traces_seq_ops); |
bc0c38d1 SR |
3277 | } |
3278 | ||
4acd4d00 SR |
3279 | static ssize_t |
3280 | tracing_write_stub(struct file *filp, const char __user *ubuf, | |
3281 | size_t count, loff_t *ppos) | |
3282 | { | |
3283 | return count; | |
3284 | } | |
3285 | ||
364829b1 SP |
3286 | static loff_t tracing_seek(struct file *file, loff_t offset, int origin) |
3287 | { | |
3288 | if (file->f_mode & FMODE_READ) | |
3289 | return seq_lseek(file, offset, origin); | |
3290 | else | |
3291 | return 0; | |
3292 | } | |
3293 | ||
5e2336a0 | 3294 | static const struct file_operations tracing_fops = { |
4bf39a94 IM |
3295 | .open = tracing_open, |
3296 | .read = seq_read, | |
4acd4d00 | 3297 | .write = tracing_write_stub, |
364829b1 | 3298 | .llseek = tracing_seek, |
4bf39a94 | 3299 | .release = tracing_release, |
bc0c38d1 SR |
3300 | }; |
3301 | ||
5e2336a0 | 3302 | static const struct file_operations show_traces_fops = { |
c7078de1 IM |
3303 | .open = show_traces_open, |
3304 | .read = seq_read, | |
3305 | .release = seq_release, | |
b444786f | 3306 | .llseek = seq_lseek, |
c7078de1 IM |
3307 | }; |
3308 | ||
36dfe925 IM |
3309 | /* |
3310 | * Only trace on a CPU if the bitmask is set: | |
3311 | */ | |
9e01c1b7 | 3312 | static cpumask_var_t tracing_cpumask; |
36dfe925 IM |
3313 | |
3314 | /* | |
3315 | * The tracer itself will not take this lock, but still we want | |
3316 | * to provide a consistent cpumask to user-space: | |
3317 | */ | |
3318 | static DEFINE_MUTEX(tracing_cpumask_update_lock); | |
3319 | ||
3320 | /* | |
3321 | * Temporary storage for the character representation of the | |
3322 | * CPU bitmask (and one more byte for the newline): | |
3323 | */ | |
3324 | static char mask_str[NR_CPUS + 1]; | |
3325 | ||
c7078de1 IM |
3326 | static ssize_t |
3327 | tracing_cpumask_read(struct file *filp, char __user *ubuf, | |
3328 | size_t count, loff_t *ppos) | |
3329 | { | |
36dfe925 | 3330 | int len; |
c7078de1 IM |
3331 | |
3332 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 | 3333 | |
9e01c1b7 | 3334 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); |
36dfe925 IM |
3335 | if (count - len < 2) { |
3336 | count = -EINVAL; | |
3337 | goto out_err; | |
3338 | } | |
3339 | len += sprintf(mask_str + len, "\n"); | |
3340 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); | |
3341 | ||
3342 | out_err: | |
c7078de1 IM |
3343 | mutex_unlock(&tracing_cpumask_update_lock); |
3344 | ||
3345 | return count; | |
3346 | } | |
3347 | ||
3348 | static ssize_t | |
3349 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, | |
3350 | size_t count, loff_t *ppos) | |
3351 | { | |
2b6080f2 | 3352 | struct trace_array *tr = filp->private_data; |
9e01c1b7 | 3353 | cpumask_var_t tracing_cpumask_new; |
2b6080f2 | 3354 | int err, cpu; |
9e01c1b7 RR |
3355 | |
3356 | if (!alloc_cpumask_var(&tracing_cpumask_new, GFP_KERNEL)) | |
3357 | return -ENOMEM; | |
c7078de1 | 3358 | |
9e01c1b7 | 3359 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
c7078de1 | 3360 | if (err) |
36dfe925 IM |
3361 | goto err_unlock; |
3362 | ||
215368e8 LZ |
3363 | mutex_lock(&tracing_cpumask_update_lock); |
3364 | ||
a5e25883 | 3365 | local_irq_disable(); |
0199c4e6 | 3366 | arch_spin_lock(&ftrace_max_lock); |
ab46428c | 3367 | for_each_tracing_cpu(cpu) { |
36dfe925 IM |
3368 | /* |
3369 | * Increase/decrease the disabled counter if we are | |
3370 | * about to flip a bit in the cpumask: | |
3371 | */ | |
9e01c1b7 RR |
3372 | if (cpumask_test_cpu(cpu, tracing_cpumask) && |
3373 | !cpumask_test_cpu(cpu, tracing_cpumask_new)) { | |
12883efb SRRH |
3374 | atomic_inc(&per_cpu_ptr(tr->trace_buffer.data, cpu)->disabled); |
3375 | ring_buffer_record_disable_cpu(tr->trace_buffer.buffer, cpu); | |
36dfe925 | 3376 | } |
9e01c1b7 RR |
3377 | if (!cpumask_test_cpu(cpu, tracing_cpumask) && |
3378 | cpumask_test_cpu(cpu, tracing_cpumask_new)) { | |
12883efb SRRH |
3379 | atomic_dec(&per_cpu_ptr(tr->trace_buffer.data, cpu)->disabled); |
3380 | ring_buffer_record_enable_cpu(tr->trace_buffer.buffer, cpu); | |
36dfe925 IM |
3381 | } |
3382 | } | |
0199c4e6 | 3383 | arch_spin_unlock(&ftrace_max_lock); |
a5e25883 | 3384 | local_irq_enable(); |
36dfe925 | 3385 | |
9e01c1b7 | 3386 | cpumask_copy(tracing_cpumask, tracing_cpumask_new); |
36dfe925 IM |
3387 | |
3388 | mutex_unlock(&tracing_cpumask_update_lock); | |
9e01c1b7 | 3389 | free_cpumask_var(tracing_cpumask_new); |
c7078de1 IM |
3390 | |
3391 | return count; | |
36dfe925 IM |
3392 | |
3393 | err_unlock: | |
215368e8 | 3394 | free_cpumask_var(tracing_cpumask_new); |
36dfe925 IM |
3395 | |
3396 | return err; | |
c7078de1 IM |
3397 | } |
3398 | ||
5e2336a0 | 3399 | static const struct file_operations tracing_cpumask_fops = { |
c7078de1 IM |
3400 | .open = tracing_open_generic, |
3401 | .read = tracing_cpumask_read, | |
3402 | .write = tracing_cpumask_write, | |
b444786f | 3403 | .llseek = generic_file_llseek, |
bc0c38d1 SR |
3404 | }; |
3405 | ||
fdb372ed | 3406 | static int tracing_trace_options_show(struct seq_file *m, void *v) |
bc0c38d1 | 3407 | { |
d8e83d26 | 3408 | struct tracer_opt *trace_opts; |
2b6080f2 | 3409 | struct trace_array *tr = m->private; |
d8e83d26 | 3410 | u32 tracer_flags; |
d8e83d26 | 3411 | int i; |
adf9f195 | 3412 | |
d8e83d26 | 3413 | mutex_lock(&trace_types_lock); |
2b6080f2 SR |
3414 | tracer_flags = tr->current_trace->flags->val; |
3415 | trace_opts = tr->current_trace->flags->opts; | |
d8e83d26 | 3416 | |
bc0c38d1 SR |
3417 | for (i = 0; trace_options[i]; i++) { |
3418 | if (trace_flags & (1 << i)) | |
fdb372ed | 3419 | seq_printf(m, "%s\n", trace_options[i]); |
bc0c38d1 | 3420 | else |
fdb372ed | 3421 | seq_printf(m, "no%s\n", trace_options[i]); |
bc0c38d1 SR |
3422 | } |
3423 | ||
adf9f195 FW |
3424 | for (i = 0; trace_opts[i].name; i++) { |
3425 | if (tracer_flags & trace_opts[i].bit) | |
fdb372ed | 3426 | seq_printf(m, "%s\n", trace_opts[i].name); |
adf9f195 | 3427 | else |
fdb372ed | 3428 | seq_printf(m, "no%s\n", trace_opts[i].name); |
adf9f195 | 3429 | } |
d8e83d26 | 3430 | mutex_unlock(&trace_types_lock); |
adf9f195 | 3431 | |
fdb372ed | 3432 | return 0; |
bc0c38d1 | 3433 | } |
bc0c38d1 | 3434 | |
8d18eaaf LZ |
3435 | static int __set_tracer_option(struct tracer *trace, |
3436 | struct tracer_flags *tracer_flags, | |
3437 | struct tracer_opt *opts, int neg) | |
3438 | { | |
3439 | int ret; | |
bc0c38d1 | 3440 | |
8d18eaaf LZ |
3441 | ret = trace->set_flag(tracer_flags->val, opts->bit, !neg); |
3442 | if (ret) | |
3443 | return ret; | |
3444 | ||
3445 | if (neg) | |
3446 | tracer_flags->val &= ~opts->bit; | |
3447 | else | |
3448 | tracer_flags->val |= opts->bit; | |
3449 | return 0; | |
bc0c38d1 SR |
3450 | } |
3451 | ||
adf9f195 FW |
3452 | /* Try to assign a tracer specific option */ |
3453 | static int set_tracer_option(struct tracer *trace, char *cmp, int neg) | |
3454 | { | |
7770841e | 3455 | struct tracer_flags *tracer_flags = trace->flags; |
adf9f195 | 3456 | struct tracer_opt *opts = NULL; |
8d18eaaf | 3457 | int i; |
adf9f195 | 3458 | |
7770841e Z |
3459 | for (i = 0; tracer_flags->opts[i].name; i++) { |
3460 | opts = &tracer_flags->opts[i]; | |
adf9f195 | 3461 | |
8d18eaaf LZ |
3462 | if (strcmp(cmp, opts->name) == 0) |
3463 | return __set_tracer_option(trace, trace->flags, | |
3464 | opts, neg); | |
adf9f195 | 3465 | } |
adf9f195 | 3466 | |
8d18eaaf | 3467 | return -EINVAL; |
adf9f195 FW |
3468 | } |
3469 | ||
613f04a0 SRRH |
3470 | /* Some tracers require overwrite to stay enabled */ |
3471 | int trace_keep_overwrite(struct tracer *tracer, u32 mask, int set) | |
3472 | { | |
3473 | if (tracer->enabled && (mask & TRACE_ITER_OVERWRITE) && !set) | |
3474 | return -1; | |
3475 | ||
3476 | return 0; | |
3477 | } | |
3478 | ||
2b6080f2 | 3479 | int set_tracer_flag(struct trace_array *tr, unsigned int mask, int enabled) |
af4617bd SR |
3480 | { |
3481 | /* do nothing if flag is already set */ | |
3482 | if (!!(trace_flags & mask) == !!enabled) | |
613f04a0 SRRH |
3483 | return 0; |
3484 | ||
3485 | /* Give the tracer a chance to approve the change */ | |
2b6080f2 SR |
3486 | if (tr->current_trace->flag_changed) |
3487 | if (tr->current_trace->flag_changed(tr->current_trace, mask, !!enabled)) | |
613f04a0 | 3488 | return -EINVAL; |
af4617bd SR |
3489 | |
3490 | if (enabled) | |
3491 | trace_flags |= mask; | |
3492 | else | |
3493 | trace_flags &= ~mask; | |
e870e9a1 LZ |
3494 | |
3495 | if (mask == TRACE_ITER_RECORD_CMD) | |
3496 | trace_event_enable_cmd_record(enabled); | |
750912fa | 3497 | |
80902822 | 3498 | if (mask == TRACE_ITER_OVERWRITE) { |
12883efb | 3499 | ring_buffer_change_overwrite(tr->trace_buffer.buffer, enabled); |
80902822 | 3500 | #ifdef CONFIG_TRACER_MAX_TRACE |
12883efb | 3501 | ring_buffer_change_overwrite(tr->max_buffer.buffer, enabled); |
80902822 SRRH |
3502 | #endif |
3503 | } | |
81698831 SR |
3504 | |
3505 | if (mask == TRACE_ITER_PRINTK) | |
3506 | trace_printk_start_stop_comm(enabled); | |
613f04a0 SRRH |
3507 | |
3508 | return 0; | |
af4617bd SR |
3509 | } |
3510 | ||
2b6080f2 | 3511 | static int trace_set_options(struct trace_array *tr, char *option) |
bc0c38d1 | 3512 | { |
8d18eaaf | 3513 | char *cmp; |
bc0c38d1 | 3514 | int neg = 0; |
613f04a0 | 3515 | int ret = -ENODEV; |
bc0c38d1 SR |
3516 | int i; |
3517 | ||
7bcfaf54 | 3518 | cmp = strstrip(option); |
bc0c38d1 | 3519 | |
8d18eaaf | 3520 | if (strncmp(cmp, "no", 2) == 0) { |
bc0c38d1 SR |
3521 | neg = 1; |
3522 | cmp += 2; | |
3523 | } | |
3524 | ||
69d34da2 SRRH |
3525 | mutex_lock(&trace_types_lock); |
3526 | ||
bc0c38d1 | 3527 | for (i = 0; trace_options[i]; i++) { |
8d18eaaf | 3528 | if (strcmp(cmp, trace_options[i]) == 0) { |
2b6080f2 | 3529 | ret = set_tracer_flag(tr, 1 << i, !neg); |
bc0c38d1 SR |
3530 | break; |
3531 | } | |
3532 | } | |
adf9f195 FW |
3533 | |
3534 | /* If no option could be set, test the specific tracer options */ | |
69d34da2 | 3535 | if (!trace_options[i]) |
2b6080f2 | 3536 | ret = set_tracer_option(tr->current_trace, cmp, neg); |
69d34da2 SRRH |
3537 | |
3538 | mutex_unlock(&trace_types_lock); | |
bc0c38d1 | 3539 | |
7bcfaf54 SR |
3540 | return ret; |
3541 | } | |
3542 | ||
3543 | static ssize_t | |
3544 | tracing_trace_options_write(struct file *filp, const char __user *ubuf, | |
3545 | size_t cnt, loff_t *ppos) | |
3546 | { | |
2b6080f2 SR |
3547 | struct seq_file *m = filp->private_data; |
3548 | struct trace_array *tr = m->private; | |
7bcfaf54 | 3549 | char buf[64]; |
613f04a0 | 3550 | int ret; |
7bcfaf54 SR |
3551 | |
3552 | if (cnt >= sizeof(buf)) | |
3553 | return -EINVAL; | |
3554 | ||
3555 | if (copy_from_user(&buf, ubuf, cnt)) | |
3556 | return -EFAULT; | |
3557 | ||
a8dd2176 SR |
3558 | buf[cnt] = 0; |
3559 | ||
2b6080f2 | 3560 | ret = trace_set_options(tr, buf); |
613f04a0 SRRH |
3561 | if (ret < 0) |
3562 | return ret; | |
7bcfaf54 | 3563 | |
cf8517cf | 3564 | *ppos += cnt; |
bc0c38d1 SR |
3565 | |
3566 | return cnt; | |
3567 | } | |
3568 | ||
fdb372ed LZ |
3569 | static int tracing_trace_options_open(struct inode *inode, struct file *file) |
3570 | { | |
6492334c | 3571 | struct trace_array *tr = inode->i_private; |
e45ccd09 | 3572 | int ret; |
6492334c | 3573 | |
fdb372ed LZ |
3574 | if (tracing_disabled) |
3575 | return -ENODEV; | |
2b6080f2 | 3576 | |
6492334c SRRH |
3577 | if (trace_array_get(tr) < 0) |
3578 | return -ENODEV; | |
3579 | ||
e45ccd09 AL |
3580 | ret = single_open(file, tracing_trace_options_show, inode->i_private); |
3581 | if (ret < 0) | |
3582 | trace_array_put(tr); | |
3583 | ||
3584 | return ret; | |
fdb372ed LZ |
3585 | } |
3586 | ||
5e2336a0 | 3587 | static const struct file_operations tracing_iter_fops = { |
fdb372ed LZ |
3588 | .open = tracing_trace_options_open, |
3589 | .read = seq_read, | |
3590 | .llseek = seq_lseek, | |
6492334c | 3591 | .release = tracing_single_release_tr, |
ee6bce52 | 3592 | .write = tracing_trace_options_write, |
bc0c38d1 SR |
3593 | }; |
3594 | ||
7bd2f24c IM |
3595 | static const char readme_msg[] = |
3596 | "tracing mini-HOWTO:\n\n" | |
22f45649 SRRH |
3597 | "# echo 0 > tracing_on : quick way to disable tracing\n" |
3598 | "# echo 1 > tracing_on : quick way to re-enable tracing\n\n" | |
3599 | " Important files:\n" | |
3600 | " trace\t\t\t- The static contents of the buffer\n" | |
3601 | "\t\t\t To clear the buffer write into this file: echo > trace\n" | |
3602 | " trace_pipe\t\t- A consuming read to see the contents of the buffer\n" | |
3603 | " current_tracer\t- function and latency tracers\n" | |
3604 | " available_tracers\t- list of configured tracers for current_tracer\n" | |
3605 | " buffer_size_kb\t- view and modify size of per cpu buffer\n" | |
3606 | " buffer_total_size_kb - view total size of all cpu buffers\n\n" | |
3607 | " trace_clock\t\t-change the clock used to order events\n" | |
3608 | " local: Per cpu clock but may not be synced across CPUs\n" | |
3609 | " global: Synced across CPUs but slows tracing down.\n" | |
3610 | " counter: Not a clock, but just an increment\n" | |
3611 | " uptime: Jiffy counter from time of boot\n" | |
3612 | " perf: Same clock that perf events use\n" | |
3613 | #ifdef CONFIG_X86_64 | |
3614 | " x86-tsc: TSC cycle counter\n" | |
3615 | #endif | |
3616 | "\n trace_marker\t\t- Writes into this file writes into the kernel buffer\n" | |
3617 | " tracing_cpumask\t- Limit which CPUs to trace\n" | |
3618 | " instances\t\t- Make sub-buffers with: mkdir instances/foo\n" | |
3619 | "\t\t\t Remove sub-buffer with rmdir\n" | |
3620 | " trace_options\t\t- Set format or modify how tracing happens\n" | |
3621 | "\t\t\t Disable an option by adding a suffix 'no' to the option name\n" | |
3622 | #ifdef CONFIG_DYNAMIC_FTRACE | |
3623 | "\n available_filter_functions - list of functions that can be filtered on\n" | |
3624 | " set_ftrace_filter\t- echo function name in here to only trace these functions\n" | |
3625 | " accepts: func_full_name, *func_end, func_begin*, *func_middle*\n" | |
3626 | " modules: Can select a group via module\n" | |
3627 | " Format: :mod:<module-name>\n" | |
3628 | " example: echo :mod:ext3 > set_ftrace_filter\n" | |
3629 | " triggers: a command to perform when function is hit\n" | |
3630 | " Format: <function>:<trigger>[:count]\n" | |
3631 | " trigger: traceon, traceoff\n" | |
3632 | " enable_event:<system>:<event>\n" | |
3633 | " disable_event:<system>:<event>\n" | |
3634 | #ifdef CONFIG_STACKTRACE | |
3635 | " stacktrace\n" | |
3636 | #endif | |
3637 | #ifdef CONFIG_TRACER_SNAPSHOT | |
3638 | " snapshot\n" | |
3639 | #endif | |
3640 | " example: echo do_fault:traceoff > set_ftrace_filter\n" | |
3641 | " echo do_trap:traceoff:3 > set_ftrace_filter\n" | |
3642 | " The first one will disable tracing every time do_fault is hit\n" | |
3643 | " The second will disable tracing at most 3 times when do_trap is hit\n" | |
3644 | " The first time do trap is hit and it disables tracing, the counter\n" | |
3645 | " will decrement to 2. If tracing is already disabled, the counter\n" | |
3646 | " will not decrement. It only decrements when the trigger did work\n" | |
3647 | " To remove trigger without count:\n" | |
3648 | " echo '!<function>:<trigger> > set_ftrace_filter\n" | |
3649 | " To remove trigger with a count:\n" | |
3650 | " echo '!<function>:<trigger>:0 > set_ftrace_filter\n" | |
3651 | " set_ftrace_notrace\t- echo function name in here to never trace.\n" | |
3652 | " accepts: func_full_name, *func_end, func_begin*, *func_middle*\n" | |
3653 | " modules: Can select a group via module command :mod:\n" | |
3654 | " Does not accept triggers\n" | |
3655 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
3656 | #ifdef CONFIG_FUNCTION_TRACER | |
3657 | " set_ftrace_pid\t- Write pid(s) to only function trace those pids (function)\n" | |
3658 | #endif | |
3659 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER | |
3660 | " set_graph_function\t- Trace the nested calls of a function (function_graph)\n" | |
3661 | " max_graph_depth\t- Trace a limited depth of nested calls (0 is unlimited)\n" | |
3662 | #endif | |
3663 | #ifdef CONFIG_TRACER_SNAPSHOT | |
3664 | "\n snapshot\t\t- Like 'trace' but shows the content of the static snapshot buffer\n" | |
3665 | "\t\t\t Read the contents for more information\n" | |
3666 | #endif | |
3667 | #ifdef CONFIG_STACKTRACE | |
3668 | " stack_trace\t\t- Shows the max stack trace when active\n" | |
3669 | " stack_max_size\t- Shows current max stack size that was traced\n" | |
3670 | "\t\t\t Write into this file to reset the max size (trigger a new trace)\n" | |
3671 | #ifdef CONFIG_DYNAMIC_FTRACE | |
3672 | " stack_trace_filter\t- Like set_ftrace_filter but limits what stack_trace traces\n" | |
3673 | #endif | |
3674 | #endif /* CONFIG_STACKTRACE */ | |
7bd2f24c IM |
3675 | ; |
3676 | ||
3677 | static ssize_t | |
3678 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
3679 | size_t cnt, loff_t *ppos) | |
3680 | { | |
3681 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
3682 | readme_msg, strlen(readme_msg)); | |
3683 | } | |
3684 | ||
5e2336a0 | 3685 | static const struct file_operations tracing_readme_fops = { |
c7078de1 IM |
3686 | .open = tracing_open_generic, |
3687 | .read = tracing_readme_read, | |
b444786f | 3688 | .llseek = generic_file_llseek, |
7bd2f24c IM |
3689 | }; |
3690 | ||
69abe6a5 AP |
3691 | static ssize_t |
3692 | tracing_saved_cmdlines_read(struct file *file, char __user *ubuf, | |
3693 | size_t cnt, loff_t *ppos) | |
3694 | { | |
3695 | char *buf_comm; | |
3696 | char *file_buf; | |
3697 | char *buf; | |
3698 | int len = 0; | |
3699 | int pid; | |
3700 | int i; | |
3701 | ||
3702 | file_buf = kmalloc(SAVED_CMDLINES*(16+TASK_COMM_LEN), GFP_KERNEL); | |
3703 | if (!file_buf) | |
3704 | return -ENOMEM; | |
3705 | ||
3706 | buf_comm = kmalloc(TASK_COMM_LEN, GFP_KERNEL); | |
3707 | if (!buf_comm) { | |
3708 | kfree(file_buf); | |
3709 | return -ENOMEM; | |
3710 | } | |
3711 | ||
3712 | buf = file_buf; | |
3713 | ||
3714 | for (i = 0; i < SAVED_CMDLINES; i++) { | |
3715 | int r; | |
3716 | ||
3717 | pid = map_cmdline_to_pid[i]; | |
3718 | if (pid == -1 || pid == NO_CMDLINE_MAP) | |
3719 | continue; | |
3720 | ||
3721 | trace_find_cmdline(pid, buf_comm); | |
3722 | r = sprintf(buf, "%d %s\n", pid, buf_comm); | |
3723 | buf += r; | |
3724 | len += r; | |
3725 | } | |
3726 | ||
3727 | len = simple_read_from_buffer(ubuf, cnt, ppos, | |
3728 | file_buf, len); | |
3729 | ||
3730 | kfree(file_buf); | |
3731 | kfree(buf_comm); | |
3732 | ||
3733 | return len; | |
3734 | } | |
3735 | ||
3736 | static const struct file_operations tracing_saved_cmdlines_fops = { | |
6fa3eb70 S |
3737 | .open = tracing_open_generic, |
3738 | .read = tracing_saved_cmdlines_read, | |
3739 | .llseek = generic_file_llseek, | |
3740 | }; | |
3741 | ||
3742 | static ssize_t | |
3743 | tracing_saved_tgids_read(struct file *file, char __user *ubuf, | |
3744 | size_t cnt, loff_t *ppos) | |
3745 | { | |
3746 | char *file_buf; | |
3747 | char *buf; | |
3748 | int len = 0; | |
3749 | int pid; | |
3750 | int i; | |
3751 | ||
3752 | file_buf = kmalloc(SAVED_CMDLINES*(16+1+16), GFP_KERNEL); | |
3753 | if (!file_buf) | |
3754 | return -ENOMEM; | |
3755 | ||
3756 | buf = file_buf; | |
3757 | ||
3758 | for (i = 0; i < SAVED_CMDLINES; i++) { | |
3759 | int tgid; | |
3760 | int r; | |
3761 | ||
3762 | pid = map_cmdline_to_pid[i]; | |
3763 | if (pid == -1 || pid == NO_CMDLINE_MAP) | |
3764 | continue; | |
3765 | ||
3766 | tgid = trace_find_tgid(pid); | |
3767 | r = sprintf(buf, "%d %d\n", pid, tgid); | |
3768 | buf += r; | |
3769 | len += r; | |
3770 | } | |
3771 | ||
3772 | len = simple_read_from_buffer(ubuf, cnt, ppos, | |
3773 | file_buf, len); | |
3774 | ||
3775 | kfree(file_buf); | |
3776 | ||
3777 | return len; | |
3778 | } | |
3779 | ||
3780 | static const struct file_operations tracing_saved_tgids_fops = { | |
3781 | .open = tracing_open_generic, | |
3782 | .read = tracing_saved_tgids_read, | |
3783 | .llseek = generic_file_llseek, | |
69abe6a5 AP |
3784 | }; |
3785 | ||
bc0c38d1 SR |
3786 | static ssize_t |
3787 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
3788 | size_t cnt, loff_t *ppos) | |
3789 | { | |
2b6080f2 | 3790 | struct trace_array *tr = filp->private_data; |
ee6c2c1b | 3791 | char buf[MAX_TRACER_SIZE+2]; |
bc0c38d1 SR |
3792 | int r; |
3793 | ||
3794 | mutex_lock(&trace_types_lock); | |
2b6080f2 | 3795 | r = sprintf(buf, "%s\n", tr->current_trace->name); |
bc0c38d1 SR |
3796 | mutex_unlock(&trace_types_lock); |
3797 | ||
4bf39a94 | 3798 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
3799 | } |
3800 | ||
b6f11df2 ACM |
3801 | int tracer_init(struct tracer *t, struct trace_array *tr) |
3802 | { | |
12883efb | 3803 | tracing_reset_online_cpus(&tr->trace_buffer); |
b6f11df2 ACM |
3804 | return t->init(tr); |
3805 | } | |
3806 | ||
12883efb | 3807 | static void set_buffer_entries(struct trace_buffer *buf, unsigned long val) |
438ced17 VN |
3808 | { |
3809 | int cpu; | |
737223fb | 3810 | |
438ced17 | 3811 | for_each_tracing_cpu(cpu) |
12883efb | 3812 | per_cpu_ptr(buf->data, cpu)->entries = val; |
438ced17 VN |
3813 | } |
3814 | ||
12883efb | 3815 | #ifdef CONFIG_TRACER_MAX_TRACE |
d60da506 | 3816 | /* resize @tr's buffer to the size of @size_tr's entries */ |
12883efb SRRH |
3817 | static int resize_buffer_duplicate_size(struct trace_buffer *trace_buf, |
3818 | struct trace_buffer *size_buf, int cpu_id) | |
d60da506 HT |
3819 | { |
3820 | int cpu, ret = 0; | |
3821 | ||
3822 | if (cpu_id == RING_BUFFER_ALL_CPUS) { | |
3823 | for_each_tracing_cpu(cpu) { | |
12883efb SRRH |
3824 | ret = ring_buffer_resize(trace_buf->buffer, |
3825 | per_cpu_ptr(size_buf->data, cpu)->entries, cpu); | |
d60da506 HT |
3826 | if (ret < 0) |
3827 | break; | |
12883efb SRRH |
3828 | per_cpu_ptr(trace_buf->data, cpu)->entries = |
3829 | per_cpu_ptr(size_buf->data, cpu)->entries; | |
d60da506 HT |
3830 | } |
3831 | } else { | |
12883efb SRRH |
3832 | ret = ring_buffer_resize(trace_buf->buffer, |
3833 | per_cpu_ptr(size_buf->data, cpu_id)->entries, cpu_id); | |
d60da506 | 3834 | if (ret == 0) |
12883efb SRRH |
3835 | per_cpu_ptr(trace_buf->data, cpu_id)->entries = |
3836 | per_cpu_ptr(size_buf->data, cpu_id)->entries; | |
d60da506 HT |
3837 | } |
3838 | ||
3839 | return ret; | |
3840 | } | |
12883efb | 3841 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
d60da506 | 3842 | |
2b6080f2 SR |
3843 | static int __tracing_resize_ring_buffer(struct trace_array *tr, |
3844 | unsigned long size, int cpu) | |
73c5162a SR |
3845 | { |
3846 | int ret; | |
3847 | ||
3848 | /* | |
3849 | * If kernel or user changes the size of the ring buffer | |
a123c52b SR |
3850 | * we use the size that was given, and we can forget about |
3851 | * expanding it later. | |
73c5162a | 3852 | */ |
55034cd6 | 3853 | ring_buffer_expanded = true; |
73c5162a | 3854 | |
b382ede6 | 3855 | /* May be called before buffers are initialized */ |
12883efb | 3856 | if (!tr->trace_buffer.buffer) |
b382ede6 SR |
3857 | return 0; |
3858 | ||
12883efb | 3859 | ret = ring_buffer_resize(tr->trace_buffer.buffer, size, cpu); |
73c5162a SR |
3860 | if (ret < 0) |
3861 | return ret; | |
3862 | ||
12883efb | 3863 | #ifdef CONFIG_TRACER_MAX_TRACE |
2b6080f2 SR |
3864 | if (!(tr->flags & TRACE_ARRAY_FL_GLOBAL) || |
3865 | !tr->current_trace->use_max_tr) | |
ef710e10 KM |
3866 | goto out; |
3867 | ||
12883efb | 3868 | ret = ring_buffer_resize(tr->max_buffer.buffer, size, cpu); |
73c5162a | 3869 | if (ret < 0) { |
12883efb SRRH |
3870 | int r = resize_buffer_duplicate_size(&tr->trace_buffer, |
3871 | &tr->trace_buffer, cpu); | |
73c5162a | 3872 | if (r < 0) { |
a123c52b SR |
3873 | /* |
3874 | * AARGH! We are left with different | |
3875 | * size max buffer!!!! | |
3876 | * The max buffer is our "snapshot" buffer. | |
3877 | * When a tracer needs a snapshot (one of the | |
3878 | * latency tracers), it swaps the max buffer | |
3879 | * with the saved snap shot. We succeeded to | |
3880 | * update the size of the main buffer, but failed to | |
3881 | * update the size of the max buffer. But when we tried | |
3882 | * to reset the main buffer to the original size, we | |
3883 | * failed there too. This is very unlikely to | |
3884 | * happen, but if it does, warn and kill all | |
3885 | * tracing. | |
3886 | */ | |
73c5162a SR |
3887 | WARN_ON(1); |
3888 | tracing_disabled = 1; | |
3889 | } | |
3890 | return ret; | |
3891 | } | |
3892 | ||
438ced17 | 3893 | if (cpu == RING_BUFFER_ALL_CPUS) |
12883efb | 3894 | set_buffer_entries(&tr->max_buffer, size); |
438ced17 | 3895 | else |
12883efb | 3896 | per_cpu_ptr(tr->max_buffer.data, cpu)->entries = size; |
438ced17 | 3897 | |
ef710e10 | 3898 | out: |
12883efb SRRH |
3899 | #endif /* CONFIG_TRACER_MAX_TRACE */ |
3900 | ||
438ced17 | 3901 | if (cpu == RING_BUFFER_ALL_CPUS) |
12883efb | 3902 | set_buffer_entries(&tr->trace_buffer, size); |
438ced17 | 3903 | else |
12883efb | 3904 | per_cpu_ptr(tr->trace_buffer.data, cpu)->entries = size; |
73c5162a SR |
3905 | |
3906 | return ret; | |
3907 | } | |
3908 | ||
6fa3eb70 | 3909 | ssize_t tracing_resize_ring_buffer(struct trace_array *tr, |
2b6080f2 | 3910 | unsigned long size, int cpu_id) |
4f271a2a | 3911 | { |
83f40318 | 3912 | int ret = size; |
4f271a2a VN |
3913 | |
3914 | mutex_lock(&trace_types_lock); | |
3915 | ||
438ced17 VN |
3916 | if (cpu_id != RING_BUFFER_ALL_CPUS) { |
3917 | /* make sure, this cpu is enabled in the mask */ | |
3918 | if (!cpumask_test_cpu(cpu_id, tracing_buffer_mask)) { | |
3919 | ret = -EINVAL; | |
3920 | goto out; | |
3921 | } | |
3922 | } | |
4f271a2a | 3923 | |
2b6080f2 | 3924 | ret = __tracing_resize_ring_buffer(tr, size, cpu_id); |
4f271a2a VN |
3925 | if (ret < 0) |
3926 | ret = -ENOMEM; | |
3927 | ||
438ced17 | 3928 | out: |
4f271a2a VN |
3929 | mutex_unlock(&trace_types_lock); |
3930 | ||
3931 | return ret; | |
3932 | } | |
3933 | ||
1852fcce SR |
3934 | /** |
3935 | * tracing_update_buffers - used by tracing facility to expand ring buffers | |
3936 | * | |
3937 | * To save on memory when the tracing is never used on a system with it | |
3938 | * configured in. The ring buffers are set to a minimum size. But once | |
3939 | * a user starts to use the tracing facility, then they need to grow | |
3940 | * to their default size. | |
3941 | * | |
3942 | * This function is to be called when a tracer is about to be used. | |
3943 | */ | |
3944 | int tracing_update_buffers(void) | |
3945 | { | |
3946 | int ret = 0; | |
6fa3eb70 S |
3947 | #ifdef CONFIG_MTK_FTRACE_DEFAULT_ENABLE |
3948 | int i = 0; | |
3949 | #endif | |
1852fcce | 3950 | |
1027fcb2 | 3951 | mutex_lock(&trace_types_lock); |
1852fcce | 3952 | if (!ring_buffer_expanded) |
6fa3eb70 S |
3953 | #ifdef CONFIG_MTK_FTRACE_DEFAULT_ENABLE |
3954 | { | |
3955 | if(get_max_DRAM_size() >= 0x40000000 && !trace_buf_size_updated_from_cmdline){ | |
3956 | trace_buf_size_cpu0 = (CPUX_TRACE_BUF_SIZE_DEFAULT * CPU0_to_CPUX_RATIO * 1.25); | |
3957 | trace_buf_size_cpuX = (CPUX_TRACE_BUF_SIZE_DEFAULT * 1.25); | |
3958 | } | |
3959 | ||
3960 | for_each_tracing_cpu(i){ | |
3961 | ret = __tracing_resize_ring_buffer(&global_trace, (i==0?trace_buf_size_cpu0:trace_buf_size_cpuX), i); | |
3962 | if(ret < 0){ | |
3963 | printk("KERN_INFO [ftrace]fail to update cpu%d ring buffer to %lu KB \n", | |
3964 | i, (i==0?(trace_buf_size_cpu0>>10):(trace_buf_size_cpuX>>10))); | |
3965 | break; | |
3966 | } | |
3967 | } | |
3968 | } | |
3969 | #else | |
2b6080f2 | 3970 | ret = __tracing_resize_ring_buffer(&global_trace, trace_buf_size, |
438ced17 | 3971 | RING_BUFFER_ALL_CPUS); |
6fa3eb70 | 3972 | #endif |
1027fcb2 | 3973 | mutex_unlock(&trace_types_lock); |
1852fcce SR |
3974 | |
3975 | return ret; | |
3976 | } | |
3977 | ||
577b785f SR |
3978 | struct trace_option_dentry; |
3979 | ||
3980 | static struct trace_option_dentry * | |
2b6080f2 | 3981 | create_trace_option_files(struct trace_array *tr, struct tracer *tracer); |
577b785f SR |
3982 | |
3983 | static void | |
3984 | destroy_trace_option_files(struct trace_option_dentry *topts); | |
3985 | ||
b2821ae6 | 3986 | static int tracing_set_tracer(const char *buf) |
bc0c38d1 | 3987 | { |
577b785f | 3988 | static struct trace_option_dentry *topts; |
bc0c38d1 SR |
3989 | struct trace_array *tr = &global_trace; |
3990 | struct tracer *t; | |
12883efb | 3991 | #ifdef CONFIG_TRACER_MAX_TRACE |
34600f0e | 3992 | bool had_max_tr; |
12883efb | 3993 | #endif |
d9e54076 | 3994 | int ret = 0; |
bc0c38d1 | 3995 | |
1027fcb2 SR |
3996 | mutex_lock(&trace_types_lock); |
3997 | ||
73c5162a | 3998 | if (!ring_buffer_expanded) { |
2b6080f2 | 3999 | ret = __tracing_resize_ring_buffer(tr, trace_buf_size, |
438ced17 | 4000 | RING_BUFFER_ALL_CPUS); |
73c5162a | 4001 | if (ret < 0) |
59f586db | 4002 | goto out; |
73c5162a SR |
4003 | ret = 0; |
4004 | } | |
4005 | ||
bc0c38d1 SR |
4006 | for (t = trace_types; t; t = t->next) { |
4007 | if (strcmp(t->name, buf) == 0) | |
4008 | break; | |
4009 | } | |
c2931e05 FW |
4010 | if (!t) { |
4011 | ret = -EINVAL; | |
4012 | goto out; | |
4013 | } | |
2b6080f2 | 4014 | if (t == tr->current_trace) |
bc0c38d1 SR |
4015 | goto out; |
4016 | ||
9f029e83 | 4017 | trace_branch_disable(); |
613f04a0 | 4018 | |
2b6080f2 | 4019 | tr->current_trace->enabled = false; |
613f04a0 | 4020 | |
2b6080f2 SR |
4021 | if (tr->current_trace->reset) |
4022 | tr->current_trace->reset(tr); | |
34600f0e | 4023 | |
12883efb | 4024 | /* Current trace needs to be nop_trace before synchronize_sched */ |
2b6080f2 | 4025 | tr->current_trace = &nop_trace; |
34600f0e | 4026 | |
45ad21ca SRRH |
4027 | #ifdef CONFIG_TRACER_MAX_TRACE |
4028 | had_max_tr = tr->allocated_snapshot; | |
34600f0e SR |
4029 | |
4030 | if (had_max_tr && !t->use_max_tr) { | |
4031 | /* | |
4032 | * We need to make sure that the update_max_tr sees that | |
4033 | * current_trace changed to nop_trace to keep it from | |
4034 | * swapping the buffers after we resize it. | |
4035 | * The update_max_tr is called from interrupts disabled | |
4036 | * so a synchronized_sched() is sufficient. | |
4037 | */ | |
4038 | synchronize_sched(); | |
3209cff4 | 4039 | free_snapshot(tr); |
ef710e10 | 4040 | } |
12883efb | 4041 | #endif |
577b785f SR |
4042 | destroy_trace_option_files(topts); |
4043 | ||
2b6080f2 | 4044 | topts = create_trace_option_files(tr, t); |
12883efb SRRH |
4045 | |
4046 | #ifdef CONFIG_TRACER_MAX_TRACE | |
34600f0e | 4047 | if (t->use_max_tr && !had_max_tr) { |
3209cff4 | 4048 | ret = alloc_snapshot(tr); |
d60da506 HT |
4049 | if (ret < 0) |
4050 | goto out; | |
ef710e10 | 4051 | } |
12883efb | 4052 | #endif |
577b785f | 4053 | |
1c80025a | 4054 | if (t->init) { |
b6f11df2 | 4055 | ret = tracer_init(t, tr); |
1c80025a FW |
4056 | if (ret) |
4057 | goto out; | |
4058 | } | |
bc0c38d1 | 4059 | |
2b6080f2 SR |
4060 | tr->current_trace = t; |
4061 | tr->current_trace->enabled = true; | |
9f029e83 | 4062 | trace_branch_enable(tr); |
bc0c38d1 SR |
4063 | out: |
4064 | mutex_unlock(&trace_types_lock); | |
4065 | ||
d9e54076 PZ |
4066 | return ret; |
4067 | } | |
4068 | ||
4069 | static ssize_t | |
4070 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
4071 | size_t cnt, loff_t *ppos) | |
4072 | { | |
ee6c2c1b | 4073 | char buf[MAX_TRACER_SIZE+1]; |
d9e54076 PZ |
4074 | int i; |
4075 | size_t ret; | |
e6e7a65a FW |
4076 | int err; |
4077 | ||
4078 | ret = cnt; | |
d9e54076 | 4079 | |
ee6c2c1b LZ |
4080 | if (cnt > MAX_TRACER_SIZE) |
4081 | cnt = MAX_TRACER_SIZE; | |
d9e54076 PZ |
4082 | |
4083 | if (copy_from_user(&buf, ubuf, cnt)) | |
4084 | return -EFAULT; | |
4085 | ||
4086 | buf[cnt] = 0; | |
4087 | ||
4088 | /* strip ending whitespace. */ | |
4089 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
4090 | buf[i] = 0; | |
4091 | ||
6fa3eb70 | 4092 | printk(KERN_INFO "[ftrace]set current_tracer to '%s'\n", buf); |
e6e7a65a FW |
4093 | err = tracing_set_tracer(buf); |
4094 | if (err) | |
4095 | return err; | |
d9e54076 | 4096 | |
cf8517cf | 4097 | *ppos += ret; |
bc0c38d1 | 4098 | |
c2931e05 | 4099 | return ret; |
bc0c38d1 SR |
4100 | } |
4101 | ||
4102 | static ssize_t | |
4103 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
4104 | size_t cnt, loff_t *ppos) | |
4105 | { | |
4106 | unsigned long *ptr = filp->private_data; | |
4107 | char buf[64]; | |
4108 | int r; | |
4109 | ||
cffae437 | 4110 | r = snprintf(buf, sizeof(buf), "%ld\n", |
bc0c38d1 | 4111 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
cffae437 SR |
4112 | if (r > sizeof(buf)) |
4113 | r = sizeof(buf); | |
4bf39a94 | 4114 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
4115 | } |
4116 | ||
4117 | static ssize_t | |
4118 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
4119 | size_t cnt, loff_t *ppos) | |
4120 | { | |
5e39841c | 4121 | unsigned long *ptr = filp->private_data; |
5e39841c | 4122 | unsigned long val; |
c6caeeb1 | 4123 | int ret; |
bc0c38d1 | 4124 | |
22fe9b54 PH |
4125 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
4126 | if (ret) | |
c6caeeb1 | 4127 | return ret; |
bc0c38d1 SR |
4128 | |
4129 | *ptr = val * 1000; | |
4130 | ||
4131 | return cnt; | |
4132 | } | |
4133 | ||
b3806b43 SR |
4134 | static int tracing_open_pipe(struct inode *inode, struct file *filp) |
4135 | { | |
23b625fa | 4136 | struct trace_array *tr = inode->i_private; |
b3806b43 | 4137 | struct trace_iterator *iter; |
b04cc6b1 | 4138 | int ret = 0; |
b3806b43 SR |
4139 | |
4140 | if (tracing_disabled) | |
4141 | return -ENODEV; | |
4142 | ||
6492334c SRRH |
4143 | if (trace_array_get(tr) < 0) |
4144 | return -ENODEV; | |
4145 | ||
b04cc6b1 FW |
4146 | mutex_lock(&trace_types_lock); |
4147 | ||
b3806b43 SR |
4148 | /* create a buffer to store the information to pass to userspace */ |
4149 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
b04cc6b1 FW |
4150 | if (!iter) { |
4151 | ret = -ENOMEM; | |
e45ccd09 | 4152 | __trace_array_put(tr); |
b04cc6b1 FW |
4153 | goto out; |
4154 | } | |
b3806b43 | 4155 | |
d7350c3f FW |
4156 | /* |
4157 | * We make a copy of the current tracer to avoid concurrent | |
4158 | * changes on it while we are reading. | |
4159 | */ | |
4160 | iter->trace = kmalloc(sizeof(*iter->trace), GFP_KERNEL); | |
4161 | if (!iter->trace) { | |
4162 | ret = -ENOMEM; | |
4163 | goto fail; | |
4164 | } | |
2b6080f2 | 4165 | *iter->trace = *tr->current_trace; |
d7350c3f | 4166 | |
4462344e | 4167 | if (!alloc_cpumask_var(&iter->started, GFP_KERNEL)) { |
b04cc6b1 | 4168 | ret = -ENOMEM; |
d7350c3f | 4169 | goto fail; |
4462344e RR |
4170 | } |
4171 | ||
a309720c | 4172 | /* trace pipe does not show start of buffer */ |
4462344e | 4173 | cpumask_setall(iter->started); |
a309720c | 4174 | |
112f38a7 SR |
4175 | if (trace_flags & TRACE_ITER_LATENCY_FMT) |
4176 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
4177 | ||
8be0709f | 4178 | /* Output in nanoseconds only if we are using a clock in nanoseconds. */ |
58e8eedf | 4179 | if (trace_clocks[tr->clock_id].in_ns) |
8be0709f DS |
4180 | iter->iter_flags |= TRACE_FILE_TIME_IN_NS; |
4181 | ||
23b625fa ON |
4182 | iter->tr = tr; |
4183 | iter->trace_buffer = &tr->trace_buffer; | |
4184 | iter->cpu_file = tracing_get_cpu(inode); | |
d7350c3f | 4185 | mutex_init(&iter->mutex); |
b3806b43 SR |
4186 | filp->private_data = iter; |
4187 | ||
107bad8b SR |
4188 | if (iter->trace->pipe_open) |
4189 | iter->trace->pipe_open(iter); | |
107bad8b | 4190 | |
b444786f | 4191 | nonseekable_open(inode, filp); |
b04cc6b1 FW |
4192 | out: |
4193 | mutex_unlock(&trace_types_lock); | |
4194 | return ret; | |
d7350c3f FW |
4195 | |
4196 | fail: | |
4197 | kfree(iter->trace); | |
4198 | kfree(iter); | |
6492334c | 4199 | __trace_array_put(tr); |
d7350c3f FW |
4200 | mutex_unlock(&trace_types_lock); |
4201 | return ret; | |
b3806b43 SR |
4202 | } |
4203 | ||
4204 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
4205 | { | |
4206 | struct trace_iterator *iter = file->private_data; | |
23b625fa | 4207 | struct trace_array *tr = inode->i_private; |
b3806b43 | 4208 | |
b04cc6b1 FW |
4209 | mutex_lock(&trace_types_lock); |
4210 | ||
29bf4a5e | 4211 | if (iter->trace->pipe_close) |
c521efd1 SR |
4212 | iter->trace->pipe_close(iter); |
4213 | ||
b04cc6b1 FW |
4214 | mutex_unlock(&trace_types_lock); |
4215 | ||
4462344e | 4216 | free_cpumask_var(iter->started); |
d7350c3f FW |
4217 | mutex_destroy(&iter->mutex); |
4218 | kfree(iter->trace); | |
b3806b43 | 4219 | kfree(iter); |
b3806b43 | 4220 | |
6492334c SRRH |
4221 | trace_array_put(tr); |
4222 | ||
b3806b43 SR |
4223 | return 0; |
4224 | } | |
4225 | ||
2a2cc8f7 | 4226 | static unsigned int |
cc60cdc9 | 4227 | trace_poll(struct trace_iterator *iter, struct file *filp, poll_table *poll_table) |
2a2cc8f7 | 4228 | { |
15693458 SRRH |
4229 | /* Iterators are static, they should be filled or empty */ |
4230 | if (trace_buffer_iter(iter, iter->cpu_file)) | |
4231 | return POLLIN | POLLRDNORM; | |
2a2cc8f7 | 4232 | |
15693458 | 4233 | if (trace_flags & TRACE_ITER_BLOCK) |
2a2cc8f7 SSP |
4234 | /* |
4235 | * Always select as readable when in blocking mode | |
4236 | */ | |
4237 | return POLLIN | POLLRDNORM; | |
15693458 | 4238 | else |
12883efb | 4239 | return ring_buffer_poll_wait(iter->trace_buffer->buffer, iter->cpu_file, |
15693458 | 4240 | filp, poll_table); |
2a2cc8f7 | 4241 | } |
2a2cc8f7 | 4242 | |
cc60cdc9 SR |
4243 | static unsigned int |
4244 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) | |
4245 | { | |
4246 | struct trace_iterator *iter = filp->private_data; | |
4247 | ||
4248 | return trace_poll(iter, filp, poll_table); | |
2a2cc8f7 SSP |
4249 | } |
4250 | ||
6eaaa5d5 FW |
4251 | /* |
4252 | * This is a make-shift waitqueue. | |
4253 | * A tracer might use this callback on some rare cases: | |
4254 | * | |
4255 | * 1) the current tracer might hold the runqueue lock when it wakes up | |
4256 | * a reader, hence a deadlock (sched, function, and function graph tracers) | |
4257 | * 2) the function tracers, trace all functions, we don't want | |
4258 | * the overhead of calling wake_up and friends | |
4259 | * (and tracing them too) | |
4260 | * | |
4261 | * Anyway, this is really very primitive wakeup. | |
4262 | */ | |
561237e4 | 4263 | int poll_wait_pipe(struct trace_iterator *iter) |
6eaaa5d5 FW |
4264 | { |
4265 | set_current_state(TASK_INTERRUPTIBLE); | |
4266 | /* sleep for 100 msecs, and try again. */ | |
4267 | schedule_timeout(HZ / 10); | |
561237e4 | 4268 | return 0; |
6eaaa5d5 FW |
4269 | } |
4270 | ||
ff98781b EGM |
4271 | /* Must be called with trace_types_lock mutex held. */ |
4272 | static int tracing_wait_pipe(struct file *filp) | |
b3806b43 SR |
4273 | { |
4274 | struct trace_iterator *iter = filp->private_data; | |
561237e4 | 4275 | int ret; |
b3806b43 | 4276 | |
b3806b43 | 4277 | while (trace_empty(iter)) { |
2dc8f095 | 4278 | |
107bad8b | 4279 | if ((filp->f_flags & O_NONBLOCK)) { |
ff98781b | 4280 | return -EAGAIN; |
107bad8b | 4281 | } |
2dc8f095 | 4282 | |
d7350c3f | 4283 | mutex_unlock(&iter->mutex); |
107bad8b | 4284 | |
561237e4 | 4285 | ret = iter->trace->wait_pipe(iter); |
b3806b43 | 4286 | |
d7350c3f | 4287 | mutex_lock(&iter->mutex); |
107bad8b | 4288 | |
561237e4 SRRH |
4289 | if (ret) |
4290 | return ret; | |
4291 | ||
6eaaa5d5 | 4292 | if (signal_pending(current)) |
ff98781b | 4293 | return -EINTR; |
b3806b43 SR |
4294 | |
4295 | /* | |
250bfd3d | 4296 | * We block until we read something and tracing is disabled. |
b3806b43 SR |
4297 | * We still block if tracing is disabled, but we have never |
4298 | * read anything. This allows a user to cat this file, and | |
4299 | * then enable tracing. But after we have read something, | |
4300 | * we give an EOF when tracing is again disabled. | |
4301 | * | |
4302 | * iter->pos will be 0 if we haven't read anything. | |
4303 | */ | |
2fd821ee | 4304 | if (!tracing_is_on() && iter->pos) |
b3806b43 | 4305 | break; |
b3806b43 SR |
4306 | } |
4307 | ||
ff98781b EGM |
4308 | return 1; |
4309 | } | |
4310 | ||
4311 | /* | |
4312 | * Consumer reader. | |
4313 | */ | |
4314 | static ssize_t | |
4315 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
4316 | size_t cnt, loff_t *ppos) | |
4317 | { | |
4318 | struct trace_iterator *iter = filp->private_data; | |
2b6080f2 | 4319 | struct trace_array *tr = iter->tr; |
ff98781b EGM |
4320 | ssize_t sret; |
4321 | ||
d7350c3f | 4322 | /* copy the tracer to avoid using a global lock all around */ |
ff98781b | 4323 | mutex_lock(&trace_types_lock); |
2b6080f2 SR |
4324 | if (unlikely(iter->trace->name != tr->current_trace->name)) |
4325 | *iter->trace = *tr->current_trace; | |
d7350c3f FW |
4326 | mutex_unlock(&trace_types_lock); |
4327 | ||
4328 | /* | |
4329 | * Avoid more than one consumer on a single file descriptor | |
4330 | * This is just a matter of traces coherency, the ring buffer itself | |
4331 | * is protected. | |
4332 | */ | |
4333 | mutex_lock(&iter->mutex); | |
0d75118c SRRH |
4334 | |
4335 | /* return any leftover data */ | |
4336 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); | |
4337 | if (sret != -EBUSY) | |
4338 | goto out; | |
4339 | ||
4340 | trace_seq_init(&iter->seq); | |
4341 | ||
ff98781b EGM |
4342 | if (iter->trace->read) { |
4343 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); | |
4344 | if (sret) | |
4345 | goto out; | |
4346 | } | |
4347 | ||
4348 | waitagain: | |
4349 | sret = tracing_wait_pipe(filp); | |
4350 | if (sret <= 0) | |
4351 | goto out; | |
4352 | ||
b3806b43 | 4353 | /* stop when tracing is finished */ |
ff98781b EGM |
4354 | if (trace_empty(iter)) { |
4355 | sret = 0; | |
107bad8b | 4356 | goto out; |
ff98781b | 4357 | } |
b3806b43 SR |
4358 | |
4359 | if (cnt >= PAGE_SIZE) | |
4360 | cnt = PAGE_SIZE - 1; | |
4361 | ||
53d0aa77 | 4362 | /* reset all but tr, trace, and overruns */ |
53d0aa77 SR |
4363 | memset(&iter->seq, 0, |
4364 | sizeof(struct trace_iterator) - | |
4365 | offsetof(struct trace_iterator, seq)); | |
2d7ddf0a | 4366 | cpumask_clear(iter->started); |
4823ed7e | 4367 | iter->pos = -1; |
b3806b43 | 4368 | |
4f535968 | 4369 | trace_event_read_lock(); |
7e53bd42 | 4370 | trace_access_lock(iter->cpu_file); |
955b61e5 | 4371 | while (trace_find_next_entry_inc(iter) != NULL) { |
2c4f035f | 4372 | enum print_line_t ret; |
088b1e42 SR |
4373 | int len = iter->seq.len; |
4374 | ||
f9896bf3 | 4375 | ret = print_trace_line(iter); |
2c4f035f | 4376 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
088b1e42 SR |
4377 | /* don't print partial lines */ |
4378 | iter->seq.len = len; | |
b3806b43 | 4379 | break; |
088b1e42 | 4380 | } |
b91facc3 FW |
4381 | if (ret != TRACE_TYPE_NO_CONSUME) |
4382 | trace_consume(iter); | |
b3806b43 SR |
4383 | |
4384 | if (iter->seq.len >= cnt) | |
4385 | break; | |
ee5e51f5 JO |
4386 | |
4387 | /* | |
4388 | * Setting the full flag means we reached the trace_seq buffer | |
4389 | * size and we should leave by partial output condition above. | |
4390 | * One of the trace_seq_* functions is not used properly. | |
4391 | */ | |
4392 | WARN_ONCE(iter->seq.full, "full flag set for trace type %d", | |
4393 | iter->ent->type); | |
b3806b43 | 4394 | } |
7e53bd42 | 4395 | trace_access_unlock(iter->cpu_file); |
4f535968 | 4396 | trace_event_read_unlock(); |
b3806b43 | 4397 | |
b3806b43 | 4398 | /* Now copy what we have to the user */ |
6c6c2796 PP |
4399 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
4400 | if (iter->seq.readpos >= iter->seq.len) | |
f9520750 | 4401 | trace_seq_init(&iter->seq); |
9ff4b974 PP |
4402 | |
4403 | /* | |
25985edc | 4404 | * If there was nothing to send to user, in spite of consuming trace |
9ff4b974 PP |
4405 | * entries, go back to wait for more entries. |
4406 | */ | |
6c6c2796 | 4407 | if (sret == -EBUSY) |
9ff4b974 | 4408 | goto waitagain; |
b3806b43 | 4409 | |
107bad8b | 4410 | out: |
d7350c3f | 4411 | mutex_unlock(&iter->mutex); |
107bad8b | 4412 | |
6c6c2796 | 4413 | return sret; |
b3806b43 SR |
4414 | } |
4415 | ||
3c56819b EGM |
4416 | static void tracing_pipe_buf_release(struct pipe_inode_info *pipe, |
4417 | struct pipe_buffer *buf) | |
4418 | { | |
4419 | __free_page(buf->page); | |
4420 | } | |
4421 | ||
4422 | static void tracing_spd_release_pipe(struct splice_pipe_desc *spd, | |
4423 | unsigned int idx) | |
4424 | { | |
4425 | __free_page(spd->pages[idx]); | |
4426 | } | |
4427 | ||
28dfef8f | 4428 | static const struct pipe_buf_operations tracing_pipe_buf_ops = { |
34cd4998 SR |
4429 | .can_merge = 0, |
4430 | .map = generic_pipe_buf_map, | |
4431 | .unmap = generic_pipe_buf_unmap, | |
4432 | .confirm = generic_pipe_buf_confirm, | |
4433 | .release = tracing_pipe_buf_release, | |
4434 | .steal = generic_pipe_buf_steal, | |
4435 | .get = generic_pipe_buf_get, | |
3c56819b EGM |
4436 | }; |
4437 | ||
34cd4998 | 4438 | static size_t |
fa7c7f6e | 4439 | tracing_fill_pipe_page(size_t rem, struct trace_iterator *iter) |
34cd4998 SR |
4440 | { |
4441 | size_t count; | |
4442 | int ret; | |
4443 | ||
4444 | /* Seq buffer is page-sized, exactly what we need. */ | |
4445 | for (;;) { | |
4446 | count = iter->seq.len; | |
4447 | ret = print_trace_line(iter); | |
4448 | count = iter->seq.len - count; | |
4449 | if (rem < count) { | |
4450 | rem = 0; | |
4451 | iter->seq.len -= count; | |
4452 | break; | |
4453 | } | |
4454 | if (ret == TRACE_TYPE_PARTIAL_LINE) { | |
4455 | iter->seq.len -= count; | |
4456 | break; | |
4457 | } | |
4458 | ||
74e7ff8c LJ |
4459 | if (ret != TRACE_TYPE_NO_CONSUME) |
4460 | trace_consume(iter); | |
34cd4998 | 4461 | rem -= count; |
955b61e5 | 4462 | if (!trace_find_next_entry_inc(iter)) { |
34cd4998 SR |
4463 | rem = 0; |
4464 | iter->ent = NULL; | |
4465 | break; | |
4466 | } | |
4467 | } | |
4468 | ||
4469 | return rem; | |
4470 | } | |
4471 | ||
3c56819b EGM |
4472 | static ssize_t tracing_splice_read_pipe(struct file *filp, |
4473 | loff_t *ppos, | |
4474 | struct pipe_inode_info *pipe, | |
4475 | size_t len, | |
4476 | unsigned int flags) | |
4477 | { | |
35f3d14d JA |
4478 | struct page *pages_def[PIPE_DEF_BUFFERS]; |
4479 | struct partial_page partial_def[PIPE_DEF_BUFFERS]; | |
3c56819b EGM |
4480 | struct trace_iterator *iter = filp->private_data; |
4481 | struct splice_pipe_desc spd = { | |
35f3d14d JA |
4482 | .pages = pages_def, |
4483 | .partial = partial_def, | |
34cd4998 | 4484 | .nr_pages = 0, /* This gets updated below. */ |
047fe360 | 4485 | .nr_pages_max = PIPE_DEF_BUFFERS, |
34cd4998 SR |
4486 | .flags = flags, |
4487 | .ops = &tracing_pipe_buf_ops, | |
4488 | .spd_release = tracing_spd_release_pipe, | |
3c56819b | 4489 | }; |
2b6080f2 | 4490 | struct trace_array *tr = iter->tr; |
3c56819b | 4491 | ssize_t ret; |
34cd4998 | 4492 | size_t rem; |
3c56819b EGM |
4493 | unsigned int i; |
4494 | ||
35f3d14d JA |
4495 | if (splice_grow_spd(pipe, &spd)) |
4496 | return -ENOMEM; | |
4497 | ||
d7350c3f | 4498 | /* copy the tracer to avoid using a global lock all around */ |
3c56819b | 4499 | mutex_lock(&trace_types_lock); |
2b6080f2 SR |
4500 | if (unlikely(iter->trace->name != tr->current_trace->name)) |
4501 | *iter->trace = *tr->current_trace; | |
d7350c3f FW |
4502 | mutex_unlock(&trace_types_lock); |
4503 | ||
4504 | mutex_lock(&iter->mutex); | |
3c56819b EGM |
4505 | |
4506 | if (iter->trace->splice_read) { | |
4507 | ret = iter->trace->splice_read(iter, filp, | |
4508 | ppos, pipe, len, flags); | |
4509 | if (ret) | |
34cd4998 | 4510 | goto out_err; |
3c56819b EGM |
4511 | } |
4512 | ||
4513 | ret = tracing_wait_pipe(filp); | |
4514 | if (ret <= 0) | |
34cd4998 | 4515 | goto out_err; |
3c56819b | 4516 | |
955b61e5 | 4517 | if (!iter->ent && !trace_find_next_entry_inc(iter)) { |
3c56819b | 4518 | ret = -EFAULT; |
34cd4998 | 4519 | goto out_err; |
3c56819b EGM |
4520 | } |
4521 | ||
4f535968 | 4522 | trace_event_read_lock(); |
7e53bd42 | 4523 | trace_access_lock(iter->cpu_file); |
4f535968 | 4524 | |
3c56819b | 4525 | /* Fill as many pages as possible. */ |
35f3d14d JA |
4526 | for (i = 0, rem = len; i < pipe->buffers && rem; i++) { |
4527 | spd.pages[i] = alloc_page(GFP_KERNEL); | |
4528 | if (!spd.pages[i]) | |
34cd4998 | 4529 | break; |
3c56819b | 4530 | |
fa7c7f6e | 4531 | rem = tracing_fill_pipe_page(rem, iter); |
3c56819b EGM |
4532 | |
4533 | /* Copy the data into the page, so we can start over. */ | |
4534 | ret = trace_seq_to_buffer(&iter->seq, | |
35f3d14d | 4535 | page_address(spd.pages[i]), |
3c56819b EGM |
4536 | iter->seq.len); |
4537 | if (ret < 0) { | |
35f3d14d | 4538 | __free_page(spd.pages[i]); |
3c56819b EGM |
4539 | break; |
4540 | } | |
35f3d14d JA |
4541 | spd.partial[i].offset = 0; |
4542 | spd.partial[i].len = iter->seq.len; | |
3c56819b | 4543 | |
f9520750 | 4544 | trace_seq_init(&iter->seq); |
3c56819b EGM |
4545 | } |
4546 | ||
7e53bd42 | 4547 | trace_access_unlock(iter->cpu_file); |
4f535968 | 4548 | trace_event_read_unlock(); |
d7350c3f | 4549 | mutex_unlock(&iter->mutex); |
3c56819b EGM |
4550 | |
4551 | spd.nr_pages = i; | |
4552 | ||
3f3f1fce SRRH |
4553 | if (i) |
4554 | ret = splice_to_pipe(pipe, &spd); | |
4555 | else | |
4556 | ret = 0; | |
35f3d14d | 4557 | out: |
047fe360 | 4558 | splice_shrink_spd(&spd); |
35f3d14d | 4559 | return ret; |
3c56819b | 4560 | |
34cd4998 | 4561 | out_err: |
d7350c3f | 4562 | mutex_unlock(&iter->mutex); |
35f3d14d | 4563 | goto out; |
3c56819b EGM |
4564 | } |
4565 | ||
a98a3c3f SR |
4566 | static ssize_t |
4567 | tracing_entries_read(struct file *filp, char __user *ubuf, | |
4568 | size_t cnt, loff_t *ppos) | |
4569 | { | |
e5dd03c4 ON |
4570 | struct inode *inode = file_inode(filp); |
4571 | struct trace_array *tr = inode->i_private; | |
4572 | int cpu = tracing_get_cpu(inode); | |
438ced17 VN |
4573 | char buf[64]; |
4574 | int r = 0; | |
4575 | ssize_t ret; | |
a98a3c3f | 4576 | |
db526ca3 | 4577 | mutex_lock(&trace_types_lock); |
438ced17 | 4578 | |
e5dd03c4 | 4579 | if (cpu == RING_BUFFER_ALL_CPUS) { |
438ced17 VN |
4580 | int cpu, buf_size_same; |
4581 | unsigned long size; | |
4582 | ||
4583 | size = 0; | |
4584 | buf_size_same = 1; | |
4585 | /* check if all cpu sizes are same */ | |
4586 | for_each_tracing_cpu(cpu) { | |
4587 | /* fill in the size from first enabled cpu */ | |
4588 | if (size == 0) | |
12883efb SRRH |
4589 | size = per_cpu_ptr(tr->trace_buffer.data, cpu)->entries; |
4590 | if (size != per_cpu_ptr(tr->trace_buffer.data, cpu)->entries) { | |
438ced17 VN |
4591 | buf_size_same = 0; |
4592 | break; | |
4593 | } | |
4594 | } | |
4595 | ||
4596 | if (buf_size_same) { | |
4597 | if (!ring_buffer_expanded) | |
4598 | r = sprintf(buf, "%lu (expanded: %lu)\n", | |
4599 | size >> 10, | |
4600 | trace_buf_size >> 10); | |
4601 | else | |
4602 | r = sprintf(buf, "%lu\n", size >> 10); | |
4603 | } else | |
4604 | r = sprintf(buf, "X\n"); | |
4605 | } else | |
e5dd03c4 | 4606 | r = sprintf(buf, "%lu\n", per_cpu_ptr(tr->trace_buffer.data, cpu)->entries >> 10); |
438ced17 | 4607 | |
db526ca3 SR |
4608 | mutex_unlock(&trace_types_lock); |
4609 | ||
438ced17 VN |
4610 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
4611 | return ret; | |
a98a3c3f SR |
4612 | } |
4613 | ||
4614 | static ssize_t | |
4615 | tracing_entries_write(struct file *filp, const char __user *ubuf, | |
4616 | size_t cnt, loff_t *ppos) | |
4617 | { | |
e5dd03c4 ON |
4618 | struct inode *inode = file_inode(filp); |
4619 | struct trace_array *tr = inode->i_private; | |
a98a3c3f | 4620 | unsigned long val; |
6fa3eb70 | 4621 | int do_drop_cache = 0; |
4f271a2a | 4622 | int ret; |
a98a3c3f | 4623 | |
22fe9b54 PH |
4624 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
4625 | if (ret) | |
c6caeeb1 | 4626 | return ret; |
a98a3c3f SR |
4627 | |
4628 | /* must have at least 1 entry */ | |
4629 | if (!val) | |
4630 | return -EINVAL; | |
4631 | ||
1696b2b0 SR |
4632 | /* value is in KB */ |
4633 | val <<= 10; | |
6fa3eb70 | 4634 | resize_ring_buffer: |
e5dd03c4 | 4635 | ret = tracing_resize_ring_buffer(tr, val, tracing_get_cpu(inode)); |
6fa3eb70 S |
4636 | if (ret == -ENOMEM && !do_drop_cache) { |
4637 | do_drop_cache++; | |
4638 | drop_pagecache(); | |
4639 | goto resize_ring_buffer; | |
4640 | } else if (ret < 0) | |
4f271a2a | 4641 | return ret; |
a98a3c3f | 4642 | |
cf8517cf | 4643 | *ppos += cnt; |
a98a3c3f | 4644 | |
4f271a2a VN |
4645 | return cnt; |
4646 | } | |
bf5e6519 | 4647 | |
f81ab074 VN |
4648 | static ssize_t |
4649 | tracing_total_entries_read(struct file *filp, char __user *ubuf, | |
4650 | size_t cnt, loff_t *ppos) | |
4651 | { | |
4652 | struct trace_array *tr = filp->private_data; | |
4653 | char buf[64]; | |
4654 | int r, cpu; | |
4655 | unsigned long size = 0, expanded_size = 0; | |
4656 | ||
4657 | mutex_lock(&trace_types_lock); | |
4658 | for_each_tracing_cpu(cpu) { | |
12883efb | 4659 | size += per_cpu_ptr(tr->trace_buffer.data, cpu)->entries >> 10; |
f81ab074 VN |
4660 | if (!ring_buffer_expanded) |
4661 | expanded_size += trace_buf_size >> 10; | |
4662 | } | |
4663 | if (ring_buffer_expanded) | |
4664 | r = sprintf(buf, "%lu\n", size); | |
4665 | else | |
4666 | r = sprintf(buf, "%lu (expanded: %lu)\n", size, expanded_size); | |
4667 | mutex_unlock(&trace_types_lock); | |
4668 | ||
4669 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
4670 | } | |
4671 | ||
4f271a2a VN |
4672 | static ssize_t |
4673 | tracing_free_buffer_write(struct file *filp, const char __user *ubuf, | |
4674 | size_t cnt, loff_t *ppos) | |
4675 | { | |
4676 | /* | |
4677 | * There is no need to read what the user has written, this function | |
4678 | * is just to make sure that there is no error when "echo" is used | |
4679 | */ | |
4680 | ||
4681 | *ppos += cnt; | |
a98a3c3f SR |
4682 | |
4683 | return cnt; | |
4684 | } | |
4685 | ||
4f271a2a VN |
4686 | static int |
4687 | tracing_free_buffer_release(struct inode *inode, struct file *filp) | |
4688 | { | |
2b6080f2 SR |
4689 | struct trace_array *tr = inode->i_private; |
4690 | ||
cf30cf67 SR |
4691 | /* disable tracing ? */ |
4692 | if (trace_flags & TRACE_ITER_STOP_ON_FREE) | |
e25d4586 | 4693 | tracer_tracing_off(tr); |
4f271a2a | 4694 | /* resize the ring buffer to 0 */ |
2b6080f2 | 4695 | tracing_resize_ring_buffer(tr, 0, RING_BUFFER_ALL_CPUS); |
4f271a2a | 4696 | |
6492334c SRRH |
4697 | trace_array_put(tr); |
4698 | ||
4f271a2a VN |
4699 | return 0; |
4700 | } | |
4701 | ||
5bf9a1ee PP |
4702 | static ssize_t |
4703 | tracing_mark_write(struct file *filp, const char __user *ubuf, | |
4704 | size_t cnt, loff_t *fpos) | |
4705 | { | |
d696b58c | 4706 | unsigned long addr = (unsigned long)ubuf; |
b7f15519 | 4707 | struct trace_array *tr = filp->private_data; |
d696b58c SR |
4708 | struct ring_buffer_event *event; |
4709 | struct ring_buffer *buffer; | |
4710 | struct print_entry *entry; | |
4711 | unsigned long irq_flags; | |
4712 | struct page *pages[2]; | |
6edb2a8a | 4713 | void *map_page[2]; |
d696b58c SR |
4714 | int nr_pages = 1; |
4715 | ssize_t written; | |
d696b58c SR |
4716 | int offset; |
4717 | int size; | |
4718 | int len; | |
4719 | int ret; | |
6edb2a8a | 4720 | int i; |
5bf9a1ee | 4721 | |
c76f0694 | 4722 | if (tracing_disabled) |
5bf9a1ee PP |
4723 | return -EINVAL; |
4724 | ||
5224c3a3 MSB |
4725 | if (!(trace_flags & TRACE_ITER_MARKERS)) |
4726 | return -EINVAL; | |
4727 | ||
5bf9a1ee PP |
4728 | if (cnt > TRACE_BUF_SIZE) |
4729 | cnt = TRACE_BUF_SIZE; | |
4730 | ||
d696b58c SR |
4731 | /* |
4732 | * Userspace is injecting traces into the kernel trace buffer. | |
4733 | * We want to be as non intrusive as possible. | |
4734 | * To do so, we do not want to allocate any special buffers | |
4735 | * or take any locks, but instead write the userspace data | |
4736 | * straight into the ring buffer. | |
4737 | * | |
4738 | * First we need to pin the userspace buffer into memory, | |
4739 | * which, most likely it is, because it just referenced it. | |
4740 | * But there's no guarantee that it is. By using get_user_pages_fast() | |
4741 | * and kmap_atomic/kunmap_atomic() we can get access to the | |
4742 | * pages directly. We then write the data directly into the | |
4743 | * ring buffer. | |
4744 | */ | |
4745 | BUILD_BUG_ON(TRACE_BUF_SIZE >= PAGE_SIZE); | |
5bf9a1ee | 4746 | |
d696b58c SR |
4747 | /* check if we cross pages */ |
4748 | if ((addr & PAGE_MASK) != ((addr + cnt) & PAGE_MASK)) | |
4749 | nr_pages = 2; | |
4750 | ||
4751 | offset = addr & (PAGE_SIZE - 1); | |
4752 | addr &= PAGE_MASK; | |
4753 | ||
4754 | ret = get_user_pages_fast(addr, nr_pages, 0, pages); | |
4755 | if (ret < nr_pages) { | |
4756 | while (--ret >= 0) | |
4757 | put_page(pages[ret]); | |
4758 | written = -EFAULT; | |
4759 | goto out; | |
5bf9a1ee | 4760 | } |
d696b58c | 4761 | |
6edb2a8a SR |
4762 | for (i = 0; i < nr_pages; i++) |
4763 | map_page[i] = kmap_atomic(pages[i]); | |
d696b58c SR |
4764 | |
4765 | local_save_flags(irq_flags); | |
4766 | size = sizeof(*entry) + cnt + 2; /* possible \n added */ | |
b7f15519 | 4767 | buffer = tr->trace_buffer.buffer; |
d696b58c SR |
4768 | event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, size, |
4769 | irq_flags, preempt_count()); | |
4770 | if (!event) { | |
4771 | /* Ring buffer disabled, return as if not open for write */ | |
4772 | written = -EBADF; | |
4773 | goto out_unlock; | |
5bf9a1ee | 4774 | } |
d696b58c SR |
4775 | |
4776 | entry = ring_buffer_event_data(event); | |
4777 | entry->ip = _THIS_IP_; | |
4778 | ||
4779 | if (nr_pages == 2) { | |
4780 | len = PAGE_SIZE - offset; | |
6edb2a8a SR |
4781 | memcpy(&entry->buf, map_page[0] + offset, len); |
4782 | memcpy(&entry->buf[len], map_page[1], cnt - len); | |
c13d2f7c | 4783 | } else |
6edb2a8a | 4784 | memcpy(&entry->buf, map_page[0] + offset, cnt); |
5bf9a1ee | 4785 | |
d696b58c SR |
4786 | if (entry->buf[cnt - 1] != '\n') { |
4787 | entry->buf[cnt] = '\n'; | |
4788 | entry->buf[cnt + 1] = '\0'; | |
4789 | } else | |
4790 | entry->buf[cnt] = '\0'; | |
4791 | ||
7ffbd48d | 4792 | __buffer_unlock_commit(buffer, event); |
5bf9a1ee | 4793 | |
d696b58c | 4794 | written = cnt; |
5bf9a1ee | 4795 | |
d696b58c | 4796 | *fpos += written; |
1aa54bca | 4797 | |
d696b58c | 4798 | out_unlock: |
0d998434 | 4799 | for (i = nr_pages - 1; i >= 0; i--) { |
6edb2a8a SR |
4800 | kunmap_atomic(map_page[i]); |
4801 | put_page(pages[i]); | |
4802 | } | |
d696b58c | 4803 | out: |
1aa54bca | 4804 | return written; |
5bf9a1ee PP |
4805 | } |
4806 | ||
13f16d20 | 4807 | static int tracing_clock_show(struct seq_file *m, void *v) |
5079f326 | 4808 | { |
2b6080f2 | 4809 | struct trace_array *tr = m->private; |
5079f326 Z |
4810 | int i; |
4811 | ||
4812 | for (i = 0; i < ARRAY_SIZE(trace_clocks); i++) | |
13f16d20 | 4813 | seq_printf(m, |
5079f326 | 4814 | "%s%s%s%s", i ? " " : "", |
2b6080f2 SR |
4815 | i == tr->clock_id ? "[" : "", trace_clocks[i].name, |
4816 | i == tr->clock_id ? "]" : ""); | |
13f16d20 | 4817 | seq_putc(m, '\n'); |
5079f326 | 4818 | |
13f16d20 | 4819 | return 0; |
5079f326 Z |
4820 | } |
4821 | ||
4822 | static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf, | |
4823 | size_t cnt, loff_t *fpos) | |
4824 | { | |
2b6080f2 SR |
4825 | struct seq_file *m = filp->private_data; |
4826 | struct trace_array *tr = m->private; | |
5079f326 Z |
4827 | char buf[64]; |
4828 | const char *clockstr; | |
4829 | int i; | |
4830 | ||
4831 | if (cnt >= sizeof(buf)) | |
4832 | return -EINVAL; | |
4833 | ||
4834 | if (copy_from_user(&buf, ubuf, cnt)) | |
4835 | return -EFAULT; | |
4836 | ||
4837 | buf[cnt] = 0; | |
4838 | ||
4839 | clockstr = strstrip(buf); | |
4840 | ||
4841 | for (i = 0; i < ARRAY_SIZE(trace_clocks); i++) { | |
4842 | if (strcmp(trace_clocks[i].name, clockstr) == 0) | |
4843 | break; | |
4844 | } | |
4845 | if (i == ARRAY_SIZE(trace_clocks)) | |
4846 | return -EINVAL; | |
4847 | ||
5079f326 Z |
4848 | mutex_lock(&trace_types_lock); |
4849 | ||
2b6080f2 SR |
4850 | tr->clock_id = i; |
4851 | ||
12883efb | 4852 | ring_buffer_set_clock(tr->trace_buffer.buffer, trace_clocks[i].func); |
5079f326 | 4853 | |
60303ed3 DS |
4854 | /* |
4855 | * New clock may not be consistent with the previous clock. | |
4856 | * Reset the buffer so that it doesn't have incomparable timestamps. | |
4857 | */ | |
e88512e7 | 4858 | tracing_reset_online_cpus(&tr->trace_buffer); |
12883efb SRRH |
4859 | |
4860 | #ifdef CONFIG_TRACER_MAX_TRACE | |
ec8c69ea | 4861 | if (tr->max_buffer.buffer) |
12883efb | 4862 | ring_buffer_set_clock(tr->max_buffer.buffer, trace_clocks[i].func); |
e88512e7 | 4863 | tracing_reset_online_cpus(&tr->max_buffer); |
12883efb | 4864 | #endif |
60303ed3 | 4865 | |
5079f326 Z |
4866 | mutex_unlock(&trace_types_lock); |
4867 | ||
4868 | *fpos += cnt; | |
4869 | ||
4870 | return cnt; | |
4871 | } | |
4872 | ||
13f16d20 LZ |
4873 | static int tracing_clock_open(struct inode *inode, struct file *file) |
4874 | { | |
6492334c SRRH |
4875 | struct trace_array *tr = inode->i_private; |
4876 | int ret; | |
4877 | ||
13f16d20 LZ |
4878 | if (tracing_disabled) |
4879 | return -ENODEV; | |
2b6080f2 | 4880 | |
6492334c SRRH |
4881 | if (trace_array_get(tr)) |
4882 | return -ENODEV; | |
4883 | ||
4884 | ret = single_open(file, tracing_clock_show, inode->i_private); | |
4885 | if (ret < 0) | |
4886 | trace_array_put(tr); | |
4887 | ||
4888 | return ret; | |
13f16d20 LZ |
4889 | } |
4890 | ||
6de58e62 SRRH |
4891 | struct ftrace_buffer_info { |
4892 | struct trace_iterator iter; | |
4893 | void *spare; | |
4894 | unsigned int read; | |
4895 | }; | |
4896 | ||
debdd57f HT |
4897 | #ifdef CONFIG_TRACER_SNAPSHOT |
4898 | static int tracing_snapshot_open(struct inode *inode, struct file *file) | |
4899 | { | |
7272711a | 4900 | struct trace_array *tr = inode->i_private; |
debdd57f | 4901 | struct trace_iterator *iter; |
2b6080f2 | 4902 | struct seq_file *m; |
debdd57f HT |
4903 | int ret = 0; |
4904 | ||
59d8f488 SRRH |
4905 | if (trace_array_get(tr) < 0) |
4906 | return -ENODEV; | |
4907 | ||
debdd57f | 4908 | if (file->f_mode & FMODE_READ) { |
7272711a | 4909 | iter = __tracing_open(inode, file, true); |
debdd57f HT |
4910 | if (IS_ERR(iter)) |
4911 | ret = PTR_ERR(iter); | |
2b6080f2 SR |
4912 | } else { |
4913 | /* Writes still need the seq_file to hold the private data */ | |
e45ccd09 | 4914 | ret = -ENOMEM; |
2b6080f2 SR |
4915 | m = kzalloc(sizeof(*m), GFP_KERNEL); |
4916 | if (!m) | |
e45ccd09 | 4917 | goto out; |
2b6080f2 SR |
4918 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
4919 | if (!iter) { | |
4920 | kfree(m); | |
e45ccd09 | 4921 | goto out; |
2b6080f2 | 4922 | } |
e45ccd09 AL |
4923 | ret = 0; |
4924 | ||
59d8f488 | 4925 | iter->tr = tr; |
7272711a ON |
4926 | iter->trace_buffer = &tr->max_buffer; |
4927 | iter->cpu_file = tracing_get_cpu(inode); | |
2b6080f2 SR |
4928 | m->private = iter; |
4929 | file->private_data = m; | |
debdd57f | 4930 | } |
e45ccd09 | 4931 | out: |
59d8f488 SRRH |
4932 | if (ret < 0) |
4933 | trace_array_put(tr); | |
4934 | ||
debdd57f HT |
4935 | return ret; |
4936 | } | |
4937 | ||
4938 | static ssize_t | |
4939 | tracing_snapshot_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
4940 | loff_t *ppos) | |
4941 | { | |
2b6080f2 SR |
4942 | struct seq_file *m = filp->private_data; |
4943 | struct trace_iterator *iter = m->private; | |
4944 | struct trace_array *tr = iter->tr; | |
debdd57f HT |
4945 | unsigned long val; |
4946 | int ret; | |
4947 | ||
4948 | ret = tracing_update_buffers(); | |
4949 | if (ret < 0) | |
4950 | return ret; | |
4951 | ||
4952 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); | |
4953 | if (ret) | |
4954 | return ret; | |
4955 | ||
4956 | mutex_lock(&trace_types_lock); | |
4957 | ||
2b6080f2 | 4958 | if (tr->current_trace->use_max_tr) { |
debdd57f HT |
4959 | ret = -EBUSY; |
4960 | goto out; | |
4961 | } | |
4962 | ||
4963 | switch (val) { | |
4964 | case 0: | |
f1affcaa SRRH |
4965 | if (iter->cpu_file != RING_BUFFER_ALL_CPUS) { |
4966 | ret = -EINVAL; | |
4967 | break; | |
debdd57f | 4968 | } |
3209cff4 SRRH |
4969 | if (tr->allocated_snapshot) |
4970 | free_snapshot(tr); | |
debdd57f HT |
4971 | break; |
4972 | case 1: | |
f1affcaa SRRH |
4973 | /* Only allow per-cpu swap if the ring buffer supports it */ |
4974 | #ifndef CONFIG_RING_BUFFER_ALLOW_SWAP | |
4975 | if (iter->cpu_file != RING_BUFFER_ALL_CPUS) { | |
4976 | ret = -EINVAL; | |
4977 | break; | |
4978 | } | |
4979 | #endif | |
45ad21ca | 4980 | if (!tr->allocated_snapshot) { |
3209cff4 | 4981 | ret = alloc_snapshot(tr); |
debdd57f HT |
4982 | if (ret < 0) |
4983 | break; | |
debdd57f | 4984 | } |
debdd57f HT |
4985 | local_irq_disable(); |
4986 | /* Now, we're going to swap */ | |
f1affcaa | 4987 | if (iter->cpu_file == RING_BUFFER_ALL_CPUS) |
ce9bae55 | 4988 | update_max_tr(tr, current, smp_processor_id()); |
f1affcaa | 4989 | else |
ce9bae55 | 4990 | update_max_tr_single(tr, current, iter->cpu_file); |
debdd57f HT |
4991 | local_irq_enable(); |
4992 | break; | |
4993 | default: | |
45ad21ca | 4994 | if (tr->allocated_snapshot) { |
f1affcaa SRRH |
4995 | if (iter->cpu_file == RING_BUFFER_ALL_CPUS) |
4996 | tracing_reset_online_cpus(&tr->max_buffer); | |
4997 | else | |
4998 | tracing_reset(&tr->max_buffer, iter->cpu_file); | |
4999 | } | |
debdd57f HT |
5000 | break; |
5001 | } | |
5002 | ||
5003 | if (ret >= 0) { | |
5004 | *ppos += cnt; | |
5005 | ret = cnt; | |
5006 | } | |
5007 | out: | |
5008 | mutex_unlock(&trace_types_lock); | |
5009 | return ret; | |
5010 | } | |
2b6080f2 SR |
5011 | |
5012 | static int tracing_snapshot_release(struct inode *inode, struct file *file) | |
5013 | { | |
5014 | struct seq_file *m = file->private_data; | |
59d8f488 SRRH |
5015 | int ret; |
5016 | ||
5017 | ret = tracing_release(inode, file); | |
2b6080f2 SR |
5018 | |
5019 | if (file->f_mode & FMODE_READ) | |
59d8f488 | 5020 | return ret; |
2b6080f2 SR |
5021 | |
5022 | /* If write only, the seq_file is just a stub */ | |
5023 | if (m) | |
5024 | kfree(m->private); | |
5025 | kfree(m); | |
5026 | ||
5027 | return 0; | |
5028 | } | |
5029 | ||
6de58e62 SRRH |
5030 | static int tracing_buffers_open(struct inode *inode, struct file *filp); |
5031 | static ssize_t tracing_buffers_read(struct file *filp, char __user *ubuf, | |
5032 | size_t count, loff_t *ppos); | |
5033 | static int tracing_buffers_release(struct inode *inode, struct file *file); | |
5034 | static ssize_t tracing_buffers_splice_read(struct file *file, loff_t *ppos, | |
5035 | struct pipe_inode_info *pipe, size_t len, unsigned int flags); | |
5036 | ||
5037 | static int snapshot_raw_open(struct inode *inode, struct file *filp) | |
5038 | { | |
5039 | struct ftrace_buffer_info *info; | |
5040 | int ret; | |
5041 | ||
5042 | ret = tracing_buffers_open(inode, filp); | |
5043 | if (ret < 0) | |
5044 | return ret; | |
5045 | ||
5046 | info = filp->private_data; | |
5047 | ||
5048 | if (info->iter.trace->use_max_tr) { | |
5049 | tracing_buffers_release(inode, filp); | |
5050 | return -EBUSY; | |
5051 | } | |
5052 | ||
5053 | info->iter.snapshot = true; | |
5054 | info->iter.trace_buffer = &info->iter.tr->max_buffer; | |
5055 | ||
5056 | return ret; | |
5057 | } | |
5058 | ||
debdd57f HT |
5059 | #endif /* CONFIG_TRACER_SNAPSHOT */ |
5060 | ||
5061 | ||
5e2336a0 | 5062 | static const struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
5063 | .open = tracing_open_generic, |
5064 | .read = tracing_max_lat_read, | |
5065 | .write = tracing_max_lat_write, | |
b444786f | 5066 | .llseek = generic_file_llseek, |
bc0c38d1 SR |
5067 | }; |
5068 | ||
5e2336a0 | 5069 | static const struct file_operations set_tracer_fops = { |
4bf39a94 IM |
5070 | .open = tracing_open_generic, |
5071 | .read = tracing_set_trace_read, | |
5072 | .write = tracing_set_trace_write, | |
b444786f | 5073 | .llseek = generic_file_llseek, |
bc0c38d1 SR |
5074 | }; |
5075 | ||
5e2336a0 | 5076 | static const struct file_operations tracing_pipe_fops = { |
4bf39a94 | 5077 | .open = tracing_open_pipe, |
2a2cc8f7 | 5078 | .poll = tracing_poll_pipe, |
4bf39a94 | 5079 | .read = tracing_read_pipe, |
3c56819b | 5080 | .splice_read = tracing_splice_read_pipe, |
4bf39a94 | 5081 | .release = tracing_release_pipe, |
b444786f | 5082 | .llseek = no_llseek, |
b3806b43 SR |
5083 | }; |
5084 | ||
5e2336a0 | 5085 | static const struct file_operations tracing_entries_fops = { |
e5dd03c4 | 5086 | .open = tracing_open_generic_tr, |
a98a3c3f SR |
5087 | .read = tracing_entries_read, |
5088 | .write = tracing_entries_write, | |
b444786f | 5089 | .llseek = generic_file_llseek, |
e5dd03c4 | 5090 | .release = tracing_release_generic_tr, |
a98a3c3f SR |
5091 | }; |
5092 | ||
f81ab074 | 5093 | static const struct file_operations tracing_total_entries_fops = { |
6492334c | 5094 | .open = tracing_open_generic_tr, |
f81ab074 VN |
5095 | .read = tracing_total_entries_read, |
5096 | .llseek = generic_file_llseek, | |
6492334c | 5097 | .release = tracing_release_generic_tr, |
f81ab074 VN |
5098 | }; |
5099 | ||
4f271a2a | 5100 | static const struct file_operations tracing_free_buffer_fops = { |
6492334c | 5101 | .open = tracing_open_generic_tr, |
4f271a2a VN |
5102 | .write = tracing_free_buffer_write, |
5103 | .release = tracing_free_buffer_release, | |
5104 | }; | |
5105 | ||
5e2336a0 | 5106 | static const struct file_operations tracing_mark_fops = { |
6492334c | 5107 | .open = tracing_open_generic_tr, |
5bf9a1ee | 5108 | .write = tracing_mark_write, |
b444786f | 5109 | .llseek = generic_file_llseek, |
6492334c | 5110 | .release = tracing_release_generic_tr, |
5bf9a1ee PP |
5111 | }; |
5112 | ||
5079f326 | 5113 | static const struct file_operations trace_clock_fops = { |
13f16d20 LZ |
5114 | .open = tracing_clock_open, |
5115 | .read = seq_read, | |
5116 | .llseek = seq_lseek, | |
6492334c | 5117 | .release = tracing_single_release_tr, |
5079f326 Z |
5118 | .write = tracing_clock_write, |
5119 | }; | |
5120 | ||
debdd57f HT |
5121 | #ifdef CONFIG_TRACER_SNAPSHOT |
5122 | static const struct file_operations snapshot_fops = { | |
5123 | .open = tracing_snapshot_open, | |
5124 | .read = seq_read, | |
5125 | .write = tracing_snapshot_write, | |
5126 | .llseek = tracing_seek, | |
2b6080f2 | 5127 | .release = tracing_snapshot_release, |
debdd57f | 5128 | }; |
debdd57f | 5129 | |
6de58e62 SRRH |
5130 | static const struct file_operations snapshot_raw_fops = { |
5131 | .open = snapshot_raw_open, | |
5132 | .read = tracing_buffers_read, | |
5133 | .release = tracing_buffers_release, | |
5134 | .splice_read = tracing_buffers_splice_read, | |
5135 | .llseek = no_llseek, | |
2cadf913 SR |
5136 | }; |
5137 | ||
6de58e62 SRRH |
5138 | #endif /* CONFIG_TRACER_SNAPSHOT */ |
5139 | ||
2cadf913 SR |
5140 | static int tracing_buffers_open(struct inode *inode, struct file *filp) |
5141 | { | |
92b6279e | 5142 | struct trace_array *tr = inode->i_private; |
2cadf913 | 5143 | struct ftrace_buffer_info *info; |
6492334c | 5144 | int ret; |
2cadf913 SR |
5145 | |
5146 | if (tracing_disabled) | |
5147 | return -ENODEV; | |
5148 | ||
6492334c SRRH |
5149 | if (trace_array_get(tr) < 0) |
5150 | return -ENODEV; | |
5151 | ||
2cadf913 | 5152 | info = kzalloc(sizeof(*info), GFP_KERNEL); |
6492334c SRRH |
5153 | if (!info) { |
5154 | trace_array_put(tr); | |
2cadf913 | 5155 | return -ENOMEM; |
6492334c | 5156 | } |
2cadf913 | 5157 | |
a695cb58 SRRH |
5158 | mutex_lock(&trace_types_lock); |
5159 | ||
cc60cdc9 | 5160 | info->iter.tr = tr; |
92b6279e | 5161 | info->iter.cpu_file = tracing_get_cpu(inode); |
b627344f | 5162 | info->iter.trace = tr->current_trace; |
12883efb | 5163 | info->iter.trace_buffer = &tr->trace_buffer; |
cc60cdc9 | 5164 | info->spare = NULL; |
2cadf913 | 5165 | /* Force reading ring buffer for first read */ |
cc60cdc9 | 5166 | info->read = (unsigned int)-1; |
2cadf913 SR |
5167 | |
5168 | filp->private_data = info; | |
5169 | ||
a695cb58 SRRH |
5170 | mutex_unlock(&trace_types_lock); |
5171 | ||
6492334c SRRH |
5172 | ret = nonseekable_open(inode, filp); |
5173 | if (ret < 0) | |
5174 | trace_array_put(tr); | |
5175 | ||
5176 | return ret; | |
2cadf913 SR |
5177 | } |
5178 | ||
cc60cdc9 SR |
5179 | static unsigned int |
5180 | tracing_buffers_poll(struct file *filp, poll_table *poll_table) | |
5181 | { | |
5182 | struct ftrace_buffer_info *info = filp->private_data; | |
5183 | struct trace_iterator *iter = &info->iter; | |
5184 | ||
5185 | return trace_poll(iter, filp, poll_table); | |
5186 | } | |
5187 | ||
2cadf913 SR |
5188 | static ssize_t |
5189 | tracing_buffers_read(struct file *filp, char __user *ubuf, | |
5190 | size_t count, loff_t *ppos) | |
5191 | { | |
5192 | struct ftrace_buffer_info *info = filp->private_data; | |
cc60cdc9 | 5193 | struct trace_iterator *iter = &info->iter; |
2cadf913 | 5194 | ssize_t ret; |
6de58e62 | 5195 | ssize_t size; |
2cadf913 | 5196 | |
2dc5d12b SR |
5197 | if (!count) |
5198 | return 0; | |
5199 | ||
6de58e62 SRRH |
5200 | mutex_lock(&trace_types_lock); |
5201 | ||
5202 | #ifdef CONFIG_TRACER_MAX_TRACE | |
5203 | if (iter->snapshot && iter->tr->current_trace->use_max_tr) { | |
5204 | size = -EBUSY; | |
5205 | goto out_unlock; | |
5206 | } | |
5207 | #endif | |
5208 | ||
ddd538f3 | 5209 | if (!info->spare) |
12883efb SRRH |
5210 | info->spare = ring_buffer_alloc_read_page(iter->trace_buffer->buffer, |
5211 | iter->cpu_file); | |
6de58e62 | 5212 | size = -ENOMEM; |
ddd538f3 | 5213 | if (!info->spare) |
6de58e62 | 5214 | goto out_unlock; |
ddd538f3 | 5215 | |
2cadf913 SR |
5216 | /* Do we have previous read data to read? */ |
5217 | if (info->read < PAGE_SIZE) | |
5218 | goto read; | |
5219 | ||
b627344f | 5220 | again: |
cc60cdc9 | 5221 | trace_access_lock(iter->cpu_file); |
12883efb | 5222 | ret = ring_buffer_read_page(iter->trace_buffer->buffer, |
2cadf913 SR |
5223 | &info->spare, |
5224 | count, | |
cc60cdc9 SR |
5225 | iter->cpu_file, 0); |
5226 | trace_access_unlock(iter->cpu_file); | |
2cadf913 | 5227 | |
b627344f SR |
5228 | if (ret < 0) { |
5229 | if (trace_empty(iter)) { | |
6de58e62 SRRH |
5230 | if ((filp->f_flags & O_NONBLOCK)) { |
5231 | size = -EAGAIN; | |
5232 | goto out_unlock; | |
5233 | } | |
5234 | mutex_unlock(&trace_types_lock); | |
561237e4 | 5235 | ret = iter->trace->wait_pipe(iter); |
6de58e62 | 5236 | mutex_lock(&trace_types_lock); |
561237e4 SRRH |
5237 | if (ret) { |
5238 | size = ret; | |
5239 | goto out_unlock; | |
5240 | } | |
6de58e62 SRRH |
5241 | if (signal_pending(current)) { |
5242 | size = -EINTR; | |
5243 | goto out_unlock; | |
5244 | } | |
b627344f SR |
5245 | goto again; |
5246 | } | |
6de58e62 SRRH |
5247 | size = 0; |
5248 | goto out_unlock; | |
b627344f | 5249 | } |
436fc280 | 5250 | |
436fc280 | 5251 | info->read = 0; |
b627344f | 5252 | read: |
2cadf913 SR |
5253 | size = PAGE_SIZE - info->read; |
5254 | if (size > count) | |
5255 | size = count; | |
5256 | ||
5257 | ret = copy_to_user(ubuf, info->spare + info->read, size); | |
6de58e62 SRRH |
5258 | if (ret == size) { |
5259 | size = -EFAULT; | |
5260 | goto out_unlock; | |
5261 | } | |
2dc5d12b SR |
5262 | size -= ret; |
5263 | ||
2cadf913 SR |
5264 | *ppos += size; |
5265 | info->read += size; | |
5266 | ||
6de58e62 SRRH |
5267 | out_unlock: |
5268 | mutex_unlock(&trace_types_lock); | |
5269 | ||
2cadf913 SR |
5270 | return size; |
5271 | } | |
5272 | ||
5273 | static int tracing_buffers_release(struct inode *inode, struct file *file) | |
5274 | { | |
5275 | struct ftrace_buffer_info *info = file->private_data; | |
cc60cdc9 | 5276 | struct trace_iterator *iter = &info->iter; |
2cadf913 | 5277 | |
a695cb58 SRRH |
5278 | mutex_lock(&trace_types_lock); |
5279 | ||
59d8f488 | 5280 | __trace_array_put(iter->tr); |
2cadf913 | 5281 | |
ddd538f3 | 5282 | if (info->spare) |
12883efb | 5283 | ring_buffer_free_read_page(iter->trace_buffer->buffer, info->spare); |
2cadf913 SR |
5284 | kfree(info); |
5285 | ||
a695cb58 SRRH |
5286 | mutex_unlock(&trace_types_lock); |
5287 | ||
2cadf913 SR |
5288 | return 0; |
5289 | } | |
5290 | ||
5291 | struct buffer_ref { | |
5292 | struct ring_buffer *buffer; | |
5293 | void *page; | |
5294 | int ref; | |
5295 | }; | |
5296 | ||
5297 | static void buffer_pipe_buf_release(struct pipe_inode_info *pipe, | |
5298 | struct pipe_buffer *buf) | |
5299 | { | |
5300 | struct buffer_ref *ref = (struct buffer_ref *)buf->private; | |
5301 | ||
5302 | if (--ref->ref) | |
5303 | return; | |
5304 | ||
5305 | ring_buffer_free_read_page(ref->buffer, ref->page); | |
5306 | kfree(ref); | |
5307 | buf->private = 0; | |
5308 | } | |
5309 | ||
2cadf913 SR |
5310 | static void buffer_pipe_buf_get(struct pipe_inode_info *pipe, |
5311 | struct pipe_buffer *buf) | |
5312 | { | |
5313 | struct buffer_ref *ref = (struct buffer_ref *)buf->private; | |
5314 | ||
5315 | ref->ref++; | |
5316 | } | |
5317 | ||
5318 | /* Pipe buffer operations for a buffer. */ | |
28dfef8f | 5319 | static const struct pipe_buf_operations buffer_pipe_buf_ops = { |
2cadf913 SR |
5320 | .can_merge = 0, |
5321 | .map = generic_pipe_buf_map, | |
5322 | .unmap = generic_pipe_buf_unmap, | |
5323 | .confirm = generic_pipe_buf_confirm, | |
5324 | .release = buffer_pipe_buf_release, | |
d55cb6cf | 5325 | .steal = generic_pipe_buf_steal, |
2cadf913 SR |
5326 | .get = buffer_pipe_buf_get, |
5327 | }; | |
5328 | ||
5329 | /* | |
5330 | * Callback from splice_to_pipe(), if we need to release some pages | |
5331 | * at the end of the spd in case we error'ed out in filling the pipe. | |
5332 | */ | |
5333 | static void buffer_spd_release(struct splice_pipe_desc *spd, unsigned int i) | |
5334 | { | |
5335 | struct buffer_ref *ref = | |
5336 | (struct buffer_ref *)spd->partial[i].private; | |
5337 | ||
5338 | if (--ref->ref) | |
5339 | return; | |
5340 | ||
5341 | ring_buffer_free_read_page(ref->buffer, ref->page); | |
5342 | kfree(ref); | |
5343 | spd->partial[i].private = 0; | |
5344 | } | |
5345 | ||
5346 | static ssize_t | |
5347 | tracing_buffers_splice_read(struct file *file, loff_t *ppos, | |
5348 | struct pipe_inode_info *pipe, size_t len, | |
5349 | unsigned int flags) | |
5350 | { | |
5351 | struct ftrace_buffer_info *info = file->private_data; | |
cc60cdc9 | 5352 | struct trace_iterator *iter = &info->iter; |
35f3d14d JA |
5353 | struct partial_page partial_def[PIPE_DEF_BUFFERS]; |
5354 | struct page *pages_def[PIPE_DEF_BUFFERS]; | |
2cadf913 | 5355 | struct splice_pipe_desc spd = { |
35f3d14d JA |
5356 | .pages = pages_def, |
5357 | .partial = partial_def, | |
047fe360 | 5358 | .nr_pages_max = PIPE_DEF_BUFFERS, |
2cadf913 SR |
5359 | .flags = flags, |
5360 | .ops = &buffer_pipe_buf_ops, | |
5361 | .spd_release = buffer_spd_release, | |
5362 | }; | |
5363 | struct buffer_ref *ref; | |
93459c6c | 5364 | int entries, size, i; |
6de58e62 | 5365 | ssize_t ret; |
2cadf913 | 5366 | |
6de58e62 SRRH |
5367 | mutex_lock(&trace_types_lock); |
5368 | ||
5369 | #ifdef CONFIG_TRACER_MAX_TRACE | |
5370 | if (iter->snapshot && iter->tr->current_trace->use_max_tr) { | |
5371 | ret = -EBUSY; | |
5372 | goto out; | |
5373 | } | |
5374 | #endif | |
5375 | ||
93cfb3c9 | 5376 | if (*ppos & (PAGE_SIZE - 1)) { |
35f3d14d JA |
5377 | ret = -EINVAL; |
5378 | goto out; | |
93cfb3c9 LJ |
5379 | } |
5380 | ||
5381 | if (len & (PAGE_SIZE - 1)) { | |
35f3d14d JA |
5382 | if (len < PAGE_SIZE) { |
5383 | ret = -EINVAL; | |
5384 | goto out; | |
5385 | } | |
93cfb3c9 LJ |
5386 | len &= PAGE_MASK; |
5387 | } | |
5388 | ||
7bb0f7e6 AV |
5389 | if (splice_grow_spd(pipe, &spd)) { |
5390 | ret = -ENOMEM; | |
5391 | goto out; | |
5392 | } | |
5393 | ||
cc60cdc9 SR |
5394 | again: |
5395 | trace_access_lock(iter->cpu_file); | |
12883efb | 5396 | entries = ring_buffer_entries_cpu(iter->trace_buffer->buffer, iter->cpu_file); |
93459c6c | 5397 | |
35f3d14d | 5398 | for (i = 0; i < pipe->buffers && len && entries; i++, len -= PAGE_SIZE) { |
2cadf913 SR |
5399 | struct page *page; |
5400 | int r; | |
5401 | ||
5402 | ref = kzalloc(sizeof(*ref), GFP_KERNEL); | |
5403 | if (!ref) | |
5404 | break; | |
5405 | ||
7267fa68 | 5406 | ref->ref = 1; |
12883efb | 5407 | ref->buffer = iter->trace_buffer->buffer; |
cc60cdc9 | 5408 | ref->page = ring_buffer_alloc_read_page(ref->buffer, iter->cpu_file); |
2cadf913 SR |
5409 | if (!ref->page) { |
5410 | kfree(ref); | |
5411 | break; | |
5412 | } | |
5413 | ||
5414 | r = ring_buffer_read_page(ref->buffer, &ref->page, | |
cc60cdc9 | 5415 | len, iter->cpu_file, 1); |
2cadf913 | 5416 | if (r < 0) { |
7ea59064 | 5417 | ring_buffer_free_read_page(ref->buffer, ref->page); |
2cadf913 SR |
5418 | kfree(ref); |
5419 | break; | |
5420 | } | |
5421 | ||
5422 | /* | |
5423 | * zero out any left over data, this is going to | |
5424 | * user land. | |
5425 | */ | |
5426 | size = ring_buffer_page_len(ref->page); | |
5427 | if (size < PAGE_SIZE) | |
5428 | memset(ref->page + size, 0, PAGE_SIZE - size); | |
5429 | ||
5430 | page = virt_to_page(ref->page); | |
5431 | ||
5432 | spd.pages[i] = page; | |
5433 | spd.partial[i].len = PAGE_SIZE; | |
5434 | spd.partial[i].offset = 0; | |
5435 | spd.partial[i].private = (unsigned long)ref; | |
5436 | spd.nr_pages++; | |
93cfb3c9 | 5437 | *ppos += PAGE_SIZE; |
93459c6c | 5438 | |
12883efb | 5439 | entries = ring_buffer_entries_cpu(iter->trace_buffer->buffer, iter->cpu_file); |
2cadf913 SR |
5440 | } |
5441 | ||
cc60cdc9 | 5442 | trace_access_unlock(iter->cpu_file); |
2cadf913 SR |
5443 | spd.nr_pages = i; |
5444 | ||
5445 | /* did we read anything? */ | |
5446 | if (!spd.nr_pages) { | |
cc60cdc9 | 5447 | if ((file->f_flags & O_NONBLOCK) || (flags & SPLICE_F_NONBLOCK)) { |
2cadf913 | 5448 | ret = -EAGAIN; |
7bb0f7e6 | 5449 | goto out_shrink; |
cc60cdc9 | 5450 | } |
6de58e62 | 5451 | mutex_unlock(&trace_types_lock); |
561237e4 | 5452 | ret = iter->trace->wait_pipe(iter); |
6de58e62 | 5453 | mutex_lock(&trace_types_lock); |
561237e4 | 5454 | if (ret) |
7bb0f7e6 | 5455 | goto out_shrink; |
cc60cdc9 SR |
5456 | if (signal_pending(current)) { |
5457 | ret = -EINTR; | |
7bb0f7e6 | 5458 | goto out_shrink; |
cc60cdc9 SR |
5459 | } |
5460 | goto again; | |
2cadf913 SR |
5461 | } |
5462 | ||
5463 | ret = splice_to_pipe(pipe, &spd); | |
7bb0f7e6 | 5464 | out_shrink: |
047fe360 | 5465 | splice_shrink_spd(&spd); |
35f3d14d | 5466 | out: |
6de58e62 SRRH |
5467 | mutex_unlock(&trace_types_lock); |
5468 | ||
2cadf913 SR |
5469 | return ret; |
5470 | } | |
5471 | ||
5472 | static const struct file_operations tracing_buffers_fops = { | |
5473 | .open = tracing_buffers_open, | |
5474 | .read = tracing_buffers_read, | |
cc60cdc9 | 5475 | .poll = tracing_buffers_poll, |
2cadf913 SR |
5476 | .release = tracing_buffers_release, |
5477 | .splice_read = tracing_buffers_splice_read, | |
5478 | .llseek = no_llseek, | |
5479 | }; | |
5480 | ||
c8d77183 SR |
5481 | static ssize_t |
5482 | tracing_stats_read(struct file *filp, char __user *ubuf, | |
5483 | size_t count, loff_t *ppos) | |
5484 | { | |
6dafb0f1 ON |
5485 | struct inode *inode = file_inode(filp); |
5486 | struct trace_array *tr = inode->i_private; | |
12883efb | 5487 | struct trace_buffer *trace_buf = &tr->trace_buffer; |
6dafb0f1 | 5488 | int cpu = tracing_get_cpu(inode); |
c8d77183 SR |
5489 | struct trace_seq *s; |
5490 | unsigned long cnt; | |
c64e148a VN |
5491 | unsigned long long t; |
5492 | unsigned long usec_rem; | |
c8d77183 | 5493 | |
e4f2d10f | 5494 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
c8d77183 | 5495 | if (!s) |
a646365c | 5496 | return -ENOMEM; |
c8d77183 SR |
5497 | |
5498 | trace_seq_init(s); | |
5499 | ||
12883efb | 5500 | cnt = ring_buffer_entries_cpu(trace_buf->buffer, cpu); |
c8d77183 SR |
5501 | trace_seq_printf(s, "entries: %ld\n", cnt); |
5502 | ||
12883efb | 5503 | cnt = ring_buffer_overrun_cpu(trace_buf->buffer, cpu); |
c8d77183 SR |
5504 | trace_seq_printf(s, "overrun: %ld\n", cnt); |
5505 | ||
12883efb | 5506 | cnt = ring_buffer_commit_overrun_cpu(trace_buf->buffer, cpu); |
c8d77183 SR |
5507 | trace_seq_printf(s, "commit overrun: %ld\n", cnt); |
5508 | ||
12883efb | 5509 | cnt = ring_buffer_bytes_cpu(trace_buf->buffer, cpu); |
c64e148a VN |
5510 | trace_seq_printf(s, "bytes: %ld\n", cnt); |
5511 | ||
58e8eedf | 5512 | if (trace_clocks[tr->clock_id].in_ns) { |
11043d8b | 5513 | /* local or global for trace_clock */ |
12883efb | 5514 | t = ns2usecs(ring_buffer_oldest_event_ts(trace_buf->buffer, cpu)); |
11043d8b YY |
5515 | usec_rem = do_div(t, USEC_PER_SEC); |
5516 | trace_seq_printf(s, "oldest event ts: %5llu.%06lu\n", | |
5517 | t, usec_rem); | |
5518 | ||
12883efb | 5519 | t = ns2usecs(ring_buffer_time_stamp(trace_buf->buffer, cpu)); |
11043d8b YY |
5520 | usec_rem = do_div(t, USEC_PER_SEC); |
5521 | trace_seq_printf(s, "now ts: %5llu.%06lu\n", t, usec_rem); | |
5522 | } else { | |
5523 | /* counter or tsc mode for trace_clock */ | |
5524 | trace_seq_printf(s, "oldest event ts: %llu\n", | |
12883efb | 5525 | ring_buffer_oldest_event_ts(trace_buf->buffer, cpu)); |
c64e148a | 5526 | |
11043d8b | 5527 | trace_seq_printf(s, "now ts: %llu\n", |
12883efb | 5528 | ring_buffer_time_stamp(trace_buf->buffer, cpu)); |
11043d8b | 5529 | } |
c64e148a | 5530 | |
12883efb | 5531 | cnt = ring_buffer_dropped_events_cpu(trace_buf->buffer, cpu); |
884bfe89 SP |
5532 | trace_seq_printf(s, "dropped events: %ld\n", cnt); |
5533 | ||
12883efb | 5534 | cnt = ring_buffer_read_events_cpu(trace_buf->buffer, cpu); |
ad964704 SRRH |
5535 | trace_seq_printf(s, "read events: %ld\n", cnt); |
5536 | ||
c8d77183 SR |
5537 | count = simple_read_from_buffer(ubuf, count, ppos, s->buffer, s->len); |
5538 | ||
5539 | kfree(s); | |
5540 | ||
5541 | return count; | |
5542 | } | |
5543 | ||
5544 | static const struct file_operations tracing_stats_fops = { | |
6dafb0f1 | 5545 | .open = tracing_open_generic_tr, |
c8d77183 | 5546 | .read = tracing_stats_read, |
b444786f | 5547 | .llseek = generic_file_llseek, |
6dafb0f1 | 5548 | .release = tracing_release_generic_tr, |
c8d77183 SR |
5549 | }; |
5550 | ||
bc0c38d1 SR |
5551 | #ifdef CONFIG_DYNAMIC_FTRACE |
5552 | ||
b807c3d0 SR |
5553 | int __weak ftrace_arch_read_dyn_info(char *buf, int size) |
5554 | { | |
5555 | return 0; | |
5556 | } | |
5557 | ||
bc0c38d1 | 5558 | static ssize_t |
b807c3d0 | 5559 | tracing_read_dyn_info(struct file *filp, char __user *ubuf, |
bc0c38d1 SR |
5560 | size_t cnt, loff_t *ppos) |
5561 | { | |
a26a2a27 SR |
5562 | static char ftrace_dyn_info_buffer[1024]; |
5563 | static DEFINE_MUTEX(dyn_info_mutex); | |
bc0c38d1 | 5564 | unsigned long *p = filp->private_data; |
b807c3d0 | 5565 | char *buf = ftrace_dyn_info_buffer; |
a26a2a27 | 5566 | int size = ARRAY_SIZE(ftrace_dyn_info_buffer); |
bc0c38d1 SR |
5567 | int r; |
5568 | ||
b807c3d0 SR |
5569 | mutex_lock(&dyn_info_mutex); |
5570 | r = sprintf(buf, "%ld ", *p); | |
4bf39a94 | 5571 | |
a26a2a27 | 5572 | r += ftrace_arch_read_dyn_info(buf+r, (size-1)-r); |
b807c3d0 SR |
5573 | buf[r++] = '\n'; |
5574 | ||
5575 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
5576 | ||
5577 | mutex_unlock(&dyn_info_mutex); | |
5578 | ||
5579 | return r; | |
bc0c38d1 SR |
5580 | } |
5581 | ||
5e2336a0 | 5582 | static const struct file_operations tracing_dyn_info_fops = { |
4bf39a94 | 5583 | .open = tracing_open_generic, |
b807c3d0 | 5584 | .read = tracing_read_dyn_info, |
b444786f | 5585 | .llseek = generic_file_llseek, |
bc0c38d1 | 5586 | }; |
77fd5c15 | 5587 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
bc0c38d1 | 5588 | |
77fd5c15 SRRH |
5589 | #if defined(CONFIG_TRACER_SNAPSHOT) && defined(CONFIG_DYNAMIC_FTRACE) |
5590 | static void | |
5591 | ftrace_snapshot(unsigned long ip, unsigned long parent_ip, void **data) | |
5592 | { | |
5593 | tracing_snapshot(); | |
5594 | } | |
bc0c38d1 | 5595 | |
77fd5c15 SRRH |
5596 | static void |
5597 | ftrace_count_snapshot(unsigned long ip, unsigned long parent_ip, void **data) | |
bc0c38d1 | 5598 | { |
77fd5c15 SRRH |
5599 | unsigned long *count = (long *)data; |
5600 | ||
5601 | if (!*count) | |
5602 | return; | |
bc0c38d1 | 5603 | |
77fd5c15 SRRH |
5604 | if (*count != -1) |
5605 | (*count)--; | |
5606 | ||
5607 | tracing_snapshot(); | |
5608 | } | |
5609 | ||
5610 | static int | |
5611 | ftrace_snapshot_print(struct seq_file *m, unsigned long ip, | |
5612 | struct ftrace_probe_ops *ops, void *data) | |
5613 | { | |
5614 | long count = (long)data; | |
5615 | ||
5616 | seq_printf(m, "%ps:", (void *)ip); | |
5617 | ||
5618 | seq_printf(m, "snapshot"); | |
5619 | ||
5620 | if (count == -1) | |
5621 | seq_printf(m, ":unlimited\n"); | |
5622 | else | |
5623 | seq_printf(m, ":count=%ld\n", count); | |
5624 | ||
5625 | return 0; | |
5626 | } | |
5627 | ||
5628 | static struct ftrace_probe_ops snapshot_probe_ops = { | |
5629 | .func = ftrace_snapshot, | |
5630 | .print = ftrace_snapshot_print, | |
5631 | }; | |
5632 | ||
5633 | static struct ftrace_probe_ops snapshot_count_probe_ops = { | |
5634 | .func = ftrace_count_snapshot, | |
5635 | .print = ftrace_snapshot_print, | |
5636 | }; | |
5637 | ||
5638 | static int | |
5639 | ftrace_trace_snapshot_callback(struct ftrace_hash *hash, | |
5640 | char *glob, char *cmd, char *param, int enable) | |
5641 | { | |
5642 | struct ftrace_probe_ops *ops; | |
5643 | void *count = (void *)-1; | |
5644 | char *number; | |
5645 | int ret; | |
5646 | ||
5647 | /* hash funcs only work with set_ftrace_filter */ | |
5648 | if (!enable) | |
5649 | return -EINVAL; | |
5650 | ||
5651 | ops = param ? &snapshot_count_probe_ops : &snapshot_probe_ops; | |
5652 | ||
5653 | if (glob[0] == '!') { | |
5654 | unregister_ftrace_function_probe_func(glob+1, ops); | |
5655 | return 0; | |
5656 | } | |
5657 | ||
5658 | if (!param) | |
5659 | goto out_reg; | |
5660 | ||
5661 | number = strsep(¶m, ":"); | |
5662 | ||
5663 | if (!strlen(number)) | |
5664 | goto out_reg; | |
5665 | ||
5666 | /* | |
5667 | * We use the callback data field (which is a pointer) | |
5668 | * as our counter. | |
5669 | */ | |
5670 | ret = kstrtoul(number, 0, (unsigned long *)&count); | |
5671 | if (ret) | |
5672 | return ret; | |
5673 | ||
5674 | out_reg: | |
95948b1e SRV |
5675 | ret = alloc_snapshot(&global_trace); |
5676 | if (ret < 0) | |
5677 | goto out; | |
77fd5c15 | 5678 | |
95948b1e | 5679 | ret = register_ftrace_function_probe(glob, ops, count); |
77fd5c15 | 5680 | |
95948b1e | 5681 | out: |
77fd5c15 SRRH |
5682 | return ret < 0 ? ret : 0; |
5683 | } | |
5684 | ||
5685 | static struct ftrace_func_command ftrace_snapshot_cmd = { | |
5686 | .name = "snapshot", | |
5687 | .func = ftrace_trace_snapshot_callback, | |
5688 | }; | |
5689 | ||
5690 | static int register_snapshot_cmd(void) | |
5691 | { | |
5692 | return register_ftrace_command(&ftrace_snapshot_cmd); | |
5693 | } | |
5694 | #else | |
5695 | static inline int register_snapshot_cmd(void) { return 0; } | |
5696 | #endif /* defined(CONFIG_TRACER_SNAPSHOT) && defined(CONFIG_DYNAMIC_FTRACE) */ | |
bc0c38d1 | 5697 | |
2b6080f2 | 5698 | struct dentry *tracing_init_dentry_tr(struct trace_array *tr) |
bc0c38d1 | 5699 | { |
2b6080f2 SR |
5700 | if (tr->dir) |
5701 | return tr->dir; | |
bc0c38d1 | 5702 | |
3e1f60b8 FW |
5703 | if (!debugfs_initialized()) |
5704 | return NULL; | |
5705 | ||
2b6080f2 SR |
5706 | if (tr->flags & TRACE_ARRAY_FL_GLOBAL) |
5707 | tr->dir = debugfs_create_dir("tracing", NULL); | |
bc0c38d1 | 5708 | |
687c878a J |
5709 | if (!tr->dir) |
5710 | pr_warn_once("Could not create debugfs directory 'tracing'\n"); | |
bc0c38d1 | 5711 | |
2b6080f2 | 5712 | return tr->dir; |
bc0c38d1 SR |
5713 | } |
5714 | ||
2b6080f2 SR |
5715 | struct dentry *tracing_init_dentry(void) |
5716 | { | |
5717 | return tracing_init_dentry_tr(&global_trace); | |
5718 | } | |
b04cc6b1 | 5719 | |
2b6080f2 | 5720 | static struct dentry *tracing_dentry_percpu(struct trace_array *tr, int cpu) |
b04cc6b1 | 5721 | { |
b04cc6b1 FW |
5722 | struct dentry *d_tracer; |
5723 | ||
2b6080f2 SR |
5724 | if (tr->percpu_dir) |
5725 | return tr->percpu_dir; | |
b04cc6b1 | 5726 | |
2b6080f2 | 5727 | d_tracer = tracing_init_dentry_tr(tr); |
b04cc6b1 FW |
5728 | if (!d_tracer) |
5729 | return NULL; | |
5730 | ||
2b6080f2 | 5731 | tr->percpu_dir = debugfs_create_dir("per_cpu", d_tracer); |
b04cc6b1 | 5732 | |
2b6080f2 SR |
5733 | WARN_ONCE(!tr->percpu_dir, |
5734 | "Could not create debugfs directory 'per_cpu/%d'\n", cpu); | |
b04cc6b1 | 5735 | |
2b6080f2 | 5736 | return tr->percpu_dir; |
b04cc6b1 FW |
5737 | } |
5738 | ||
e2d4dbe0 ON |
5739 | static struct dentry * |
5740 | trace_create_cpu_file(const char *name, umode_t mode, struct dentry *parent, | |
5741 | void *data, long cpu, const struct file_operations *fops) | |
5742 | { | |
5743 | struct dentry *ret = trace_create_file(name, mode, parent, data, fops); | |
5744 | ||
5745 | if (ret) /* See tracing_get_cpu() */ | |
5746 | ret->d_inode->i_cdev = (void *)(cpu + 1); | |
5747 | return ret; | |
5748 | } | |
5749 | ||
2b6080f2 SR |
5750 | static void |
5751 | tracing_init_debugfs_percpu(struct trace_array *tr, long cpu) | |
b04cc6b1 | 5752 | { |
2b6080f2 | 5753 | struct dentry *d_percpu = tracing_dentry_percpu(tr, cpu); |
5452af66 | 5754 | struct dentry *d_cpu; |
dd49a38c | 5755 | char cpu_dir[30]; /* 30 characters should be more than enough */ |
b04cc6b1 | 5756 | |
0a3d7ce7 NK |
5757 | if (!d_percpu) |
5758 | return; | |
5759 | ||
dd49a38c | 5760 | snprintf(cpu_dir, 30, "cpu%ld", cpu); |
8656e7a2 FW |
5761 | d_cpu = debugfs_create_dir(cpu_dir, d_percpu); |
5762 | if (!d_cpu) { | |
5763 | pr_warning("Could not create debugfs '%s' entry\n", cpu_dir); | |
5764 | return; | |
5765 | } | |
b04cc6b1 | 5766 | |
8656e7a2 | 5767 | /* per cpu trace_pipe */ |
e2d4dbe0 | 5768 | trace_create_cpu_file("trace_pipe", 0444, d_cpu, |
23b625fa | 5769 | tr, cpu, &tracing_pipe_fops); |
b04cc6b1 FW |
5770 | |
5771 | /* per cpu trace */ | |
e2d4dbe0 | 5772 | trace_create_cpu_file("trace", 0644, d_cpu, |
7272711a | 5773 | tr, cpu, &tracing_fops); |
7f96f93f | 5774 | |
e2d4dbe0 | 5775 | trace_create_cpu_file("trace_pipe_raw", 0444, d_cpu, |
92b6279e | 5776 | tr, cpu, &tracing_buffers_fops); |
7f96f93f | 5777 | |
e2d4dbe0 | 5778 | trace_create_cpu_file("stats", 0444, d_cpu, |
6dafb0f1 | 5779 | tr, cpu, &tracing_stats_fops); |
438ced17 | 5780 | |
e2d4dbe0 | 5781 | trace_create_cpu_file("buffer_size_kb", 0444, d_cpu, |
e5dd03c4 | 5782 | tr, cpu, &tracing_entries_fops); |
f1affcaa SRRH |
5783 | |
5784 | #ifdef CONFIG_TRACER_SNAPSHOT | |
e2d4dbe0 | 5785 | trace_create_cpu_file("snapshot", 0644, d_cpu, |
7272711a | 5786 | tr, cpu, &snapshot_fops); |
6de58e62 | 5787 | |
e2d4dbe0 | 5788 | trace_create_cpu_file("snapshot_raw", 0444, d_cpu, |
92b6279e | 5789 | tr, cpu, &snapshot_raw_fops); |
f1affcaa | 5790 | #endif |
b04cc6b1 FW |
5791 | } |
5792 | ||
60a11774 SR |
5793 | #ifdef CONFIG_FTRACE_SELFTEST |
5794 | /* Let selftest have access to static functions in this file */ | |
5795 | #include "trace_selftest.c" | |
5796 | #endif | |
5797 | ||
577b785f SR |
5798 | struct trace_option_dentry { |
5799 | struct tracer_opt *opt; | |
5800 | struct tracer_flags *flags; | |
2b6080f2 | 5801 | struct trace_array *tr; |
577b785f SR |
5802 | struct dentry *entry; |
5803 | }; | |
5804 | ||
5805 | static ssize_t | |
5806 | trace_options_read(struct file *filp, char __user *ubuf, size_t cnt, | |
5807 | loff_t *ppos) | |
5808 | { | |
5809 | struct trace_option_dentry *topt = filp->private_data; | |
5810 | char *buf; | |
5811 | ||
5812 | if (topt->flags->val & topt->opt->bit) | |
5813 | buf = "1\n"; | |
5814 | else | |
5815 | buf = "0\n"; | |
5816 | ||
5817 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
5818 | } | |
5819 | ||
5820 | static ssize_t | |
5821 | trace_options_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
5822 | loff_t *ppos) | |
5823 | { | |
5824 | struct trace_option_dentry *topt = filp->private_data; | |
5825 | unsigned long val; | |
577b785f SR |
5826 | int ret; |
5827 | ||
22fe9b54 PH |
5828 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
5829 | if (ret) | |
577b785f SR |
5830 | return ret; |
5831 | ||
8d18eaaf LZ |
5832 | if (val != 0 && val != 1) |
5833 | return -EINVAL; | |
577b785f | 5834 | |
8d18eaaf | 5835 | if (!!(topt->flags->val & topt->opt->bit) != val) { |
577b785f | 5836 | mutex_lock(&trace_types_lock); |
2b6080f2 | 5837 | ret = __set_tracer_option(topt->tr->current_trace, topt->flags, |
c757bea9 | 5838 | topt->opt, !val); |
577b785f SR |
5839 | mutex_unlock(&trace_types_lock); |
5840 | if (ret) | |
5841 | return ret; | |
577b785f SR |
5842 | } |
5843 | ||
5844 | *ppos += cnt; | |
5845 | ||
5846 | return cnt; | |
5847 | } | |
5848 | ||
5849 | ||
5850 | static const struct file_operations trace_options_fops = { | |
5851 | .open = tracing_open_generic, | |
5852 | .read = trace_options_read, | |
5853 | .write = trace_options_write, | |
b444786f | 5854 | .llseek = generic_file_llseek, |
577b785f SR |
5855 | }; |
5856 | ||
a8259075 SR |
5857 | static ssize_t |
5858 | trace_options_core_read(struct file *filp, char __user *ubuf, size_t cnt, | |
5859 | loff_t *ppos) | |
5860 | { | |
5861 | long index = (long)filp->private_data; | |
5862 | char *buf; | |
5863 | ||
5864 | if (trace_flags & (1 << index)) | |
5865 | buf = "1\n"; | |
5866 | else | |
5867 | buf = "0\n"; | |
5868 | ||
5869 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
5870 | } | |
5871 | ||
5872 | static ssize_t | |
5873 | trace_options_core_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
5874 | loff_t *ppos) | |
5875 | { | |
2b6080f2 | 5876 | struct trace_array *tr = &global_trace; |
a8259075 | 5877 | long index = (long)filp->private_data; |
a8259075 SR |
5878 | unsigned long val; |
5879 | int ret; | |
5880 | ||
22fe9b54 PH |
5881 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
5882 | if (ret) | |
a8259075 SR |
5883 | return ret; |
5884 | ||
f2d84b65 | 5885 | if (val != 0 && val != 1) |
a8259075 | 5886 | return -EINVAL; |
69d34da2 SRRH |
5887 | |
5888 | mutex_lock(&trace_types_lock); | |
2b6080f2 | 5889 | ret = set_tracer_flag(tr, 1 << index, val); |
69d34da2 | 5890 | mutex_unlock(&trace_types_lock); |
a8259075 | 5891 | |
613f04a0 SRRH |
5892 | if (ret < 0) |
5893 | return ret; | |
5894 | ||
a8259075 SR |
5895 | *ppos += cnt; |
5896 | ||
5897 | return cnt; | |
5898 | } | |
5899 | ||
a8259075 SR |
5900 | static const struct file_operations trace_options_core_fops = { |
5901 | .open = tracing_open_generic, | |
5902 | .read = trace_options_core_read, | |
5903 | .write = trace_options_core_write, | |
b444786f | 5904 | .llseek = generic_file_llseek, |
a8259075 SR |
5905 | }; |
5906 | ||
5452af66 | 5907 | struct dentry *trace_create_file(const char *name, |
f4ae40a6 | 5908 | umode_t mode, |
5452af66 FW |
5909 | struct dentry *parent, |
5910 | void *data, | |
5911 | const struct file_operations *fops) | |
5912 | { | |
5913 | struct dentry *ret; | |
5914 | ||
5915 | ret = debugfs_create_file(name, mode, parent, data, fops); | |
5916 | if (!ret) | |
5917 | pr_warning("Could not create debugfs '%s' entry\n", name); | |
5918 | ||
5919 | return ret; | |
5920 | } | |
5921 | ||
5922 | ||
2b6080f2 | 5923 | static struct dentry *trace_options_init_dentry(struct trace_array *tr) |
a8259075 SR |
5924 | { |
5925 | struct dentry *d_tracer; | |
a8259075 | 5926 | |
2b6080f2 SR |
5927 | if (tr->options) |
5928 | return tr->options; | |
a8259075 | 5929 | |
2b6080f2 | 5930 | d_tracer = tracing_init_dentry_tr(tr); |
a8259075 SR |
5931 | if (!d_tracer) |
5932 | return NULL; | |
5933 | ||
2b6080f2 SR |
5934 | tr->options = debugfs_create_dir("options", d_tracer); |
5935 | if (!tr->options) { | |
a8259075 SR |
5936 | pr_warning("Could not create debugfs directory 'options'\n"); |
5937 | return NULL; | |
5938 | } | |
5939 | ||
2b6080f2 | 5940 | return tr->options; |
a8259075 SR |
5941 | } |
5942 | ||
577b785f | 5943 | static void |
2b6080f2 SR |
5944 | create_trace_option_file(struct trace_array *tr, |
5945 | struct trace_option_dentry *topt, | |
577b785f SR |
5946 | struct tracer_flags *flags, |
5947 | struct tracer_opt *opt) | |
5948 | { | |
5949 | struct dentry *t_options; | |
577b785f | 5950 | |
2b6080f2 | 5951 | t_options = trace_options_init_dentry(tr); |
577b785f SR |
5952 | if (!t_options) |
5953 | return; | |
5954 | ||
5955 | topt->flags = flags; | |
5956 | topt->opt = opt; | |
2b6080f2 | 5957 | topt->tr = tr; |
577b785f | 5958 | |
5452af66 | 5959 | topt->entry = trace_create_file(opt->name, 0644, t_options, topt, |
577b785f SR |
5960 | &trace_options_fops); |
5961 | ||
577b785f SR |
5962 | } |
5963 | ||
5964 | static struct trace_option_dentry * | |
2b6080f2 | 5965 | create_trace_option_files(struct trace_array *tr, struct tracer *tracer) |
577b785f SR |
5966 | { |
5967 | struct trace_option_dentry *topts; | |
5968 | struct tracer_flags *flags; | |
5969 | struct tracer_opt *opts; | |
5970 | int cnt; | |
5971 | ||
5972 | if (!tracer) | |
5973 | return NULL; | |
5974 | ||
5975 | flags = tracer->flags; | |
5976 | ||
5977 | if (!flags || !flags->opts) | |
5978 | return NULL; | |
5979 | ||
5980 | opts = flags->opts; | |
5981 | ||
5982 | for (cnt = 0; opts[cnt].name; cnt++) | |
5983 | ; | |
5984 | ||
0cfe8245 | 5985 | topts = kcalloc(cnt + 1, sizeof(*topts), GFP_KERNEL); |
577b785f SR |
5986 | if (!topts) |
5987 | return NULL; | |
5988 | ||
5989 | for (cnt = 0; opts[cnt].name; cnt++) | |
2b6080f2 | 5990 | create_trace_option_file(tr, &topts[cnt], flags, |
577b785f SR |
5991 | &opts[cnt]); |
5992 | ||
5993 | return topts; | |
5994 | } | |
5995 | ||
5996 | static void | |
5997 | destroy_trace_option_files(struct trace_option_dentry *topts) | |
5998 | { | |
5999 | int cnt; | |
6000 | ||
6001 | if (!topts) | |
6002 | return; | |
6003 | ||
6004 | for (cnt = 0; topts[cnt].opt; cnt++) { | |
6005 | if (topts[cnt].entry) | |
6006 | debugfs_remove(topts[cnt].entry); | |
6007 | } | |
6008 | ||
6009 | kfree(topts); | |
6010 | } | |
6011 | ||
a8259075 | 6012 | static struct dentry * |
2b6080f2 SR |
6013 | create_trace_option_core_file(struct trace_array *tr, |
6014 | const char *option, long index) | |
a8259075 SR |
6015 | { |
6016 | struct dentry *t_options; | |
a8259075 | 6017 | |
2b6080f2 | 6018 | t_options = trace_options_init_dentry(tr); |
a8259075 SR |
6019 | if (!t_options) |
6020 | return NULL; | |
6021 | ||
5452af66 | 6022 | return trace_create_file(option, 0644, t_options, (void *)index, |
a8259075 | 6023 | &trace_options_core_fops); |
a8259075 SR |
6024 | } |
6025 | ||
2b6080f2 | 6026 | static __init void create_trace_options_dir(struct trace_array *tr) |
a8259075 SR |
6027 | { |
6028 | struct dentry *t_options; | |
a8259075 SR |
6029 | int i; |
6030 | ||
2b6080f2 | 6031 | t_options = trace_options_init_dentry(tr); |
a8259075 SR |
6032 | if (!t_options) |
6033 | return; | |
6034 | ||
5452af66 | 6035 | for (i = 0; trace_options[i]; i++) |
2b6080f2 | 6036 | create_trace_option_core_file(tr, trace_options[i], i); |
a8259075 SR |
6037 | } |
6038 | ||
499e5470 SR |
6039 | static ssize_t |
6040 | rb_simple_read(struct file *filp, char __user *ubuf, | |
6041 | size_t cnt, loff_t *ppos) | |
6042 | { | |
348f0fc2 | 6043 | struct trace_array *tr = filp->private_data; |
499e5470 SR |
6044 | char buf[64]; |
6045 | int r; | |
6046 | ||
2fd821ee | 6047 | r = tracer_tracing_is_on(tr); |
499e5470 SR |
6048 | r = sprintf(buf, "%d\n", r); |
6049 | ||
6050 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
6051 | } | |
6052 | ||
6053 | static ssize_t | |
6054 | rb_simple_write(struct file *filp, const char __user *ubuf, | |
6055 | size_t cnt, loff_t *ppos) | |
6056 | { | |
348f0fc2 | 6057 | struct trace_array *tr = filp->private_data; |
12883efb | 6058 | struct ring_buffer *buffer = tr->trace_buffer.buffer; |
499e5470 SR |
6059 | unsigned long val; |
6060 | int ret; | |
6061 | ||
6062 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); | |
6063 | if (ret) | |
6064 | return ret; | |
6065 | ||
6066 | if (buffer) { | |
6fa3eb70 S |
6067 | if(ring_buffer_record_is_on(buffer) ^ val) |
6068 | printk(KERN_INFO "[ftrace]tracing_on is toggled to %lu\n", val); | |
2df8f8a6 SR |
6069 | mutex_lock(&trace_types_lock); |
6070 | if (val) { | |
2fd821ee | 6071 | tracer_tracing_on(tr); |
6fa3eb70 S |
6072 | #ifdef CONFIG_MTK_SCHED_TRACERS |
6073 | trace_tracing_on(val, CALLER_ADDR0); | |
6074 | #endif | |
2b6080f2 SR |
6075 | if (tr->current_trace->start) |
6076 | tr->current_trace->start(tr); | |
2df8f8a6 | 6077 | } else { |
6fa3eb70 S |
6078 | #ifdef CONFIG_MTK_SCHED_TRACERS |
6079 | trace_tracing_on(val, CALLER_ADDR0); | |
6080 | #endif | |
2fd821ee | 6081 | tracer_tracing_off(tr); |
2b6080f2 SR |
6082 | if (tr->current_trace->stop) |
6083 | tr->current_trace->stop(tr); | |
2df8f8a6 SR |
6084 | } |
6085 | mutex_unlock(&trace_types_lock); | |
499e5470 SR |
6086 | } |
6087 | ||
6088 | (*ppos)++; | |
6089 | ||
6090 | return cnt; | |
6091 | } | |
6092 | ||
6093 | static const struct file_operations rb_simple_fops = { | |
6492334c | 6094 | .open = tracing_open_generic_tr, |
499e5470 SR |
6095 | .read = rb_simple_read, |
6096 | .write = rb_simple_write, | |
6492334c | 6097 | .release = tracing_release_generic_tr, |
499e5470 SR |
6098 | .llseek = default_llseek, |
6099 | }; | |
6100 | ||
6fa3eb70 S |
6101 | #ifdef CONFIG_MTK_KERNEL_MARKER |
6102 | static int mt_kernel_marker_enabled = 1; | |
6103 | static ssize_t | |
6104 | mt_kernel_marker_enabled_simple_read(struct file *filp, char __user *ubuf, | |
6105 | size_t cnt, loff_t *ppos) | |
6106 | { | |
6107 | char buf[64]; | |
6108 | int r; | |
6109 | ||
6110 | r = sprintf(buf, "%d\n", mt_kernel_marker_enabled); | |
6111 | ||
6112 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
6113 | } | |
6114 | static ssize_t | |
6115 | mt_kernel_marker_enabled_simple_write(struct file *filp, const char __user *ubuf, | |
6116 | size_t cnt, loff_t *ppos) | |
6117 | { | |
6118 | unsigned long val; | |
6119 | int ret; | |
6120 | ||
6121 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); | |
6122 | if (ret) | |
6123 | return ret; | |
6124 | ||
6125 | mt_kernel_marker_enabled = !!val; | |
6126 | ||
6127 | (*ppos)++; | |
6128 | ||
6129 | return cnt; | |
6130 | } | |
6131 | static const struct file_operations kernel_marker_simple_fops = { | |
6132 | .open = tracing_open_generic, | |
6133 | .read = mt_kernel_marker_enabled_simple_read, | |
6134 | .write = mt_kernel_marker_enabled_simple_write, | |
6135 | .llseek = default_llseek, | |
6136 | }; | |
6137 | #endif | |
277ba044 SR |
6138 | struct dentry *trace_instance_dir; |
6139 | ||
6140 | static void | |
6141 | init_tracer_debugfs(struct trace_array *tr, struct dentry *d_tracer); | |
6142 | ||
737223fb SRRH |
6143 | static void init_trace_buffers(struct trace_array *tr, struct trace_buffer *buf) |
6144 | { | |
6145 | int cpu; | |
6146 | ||
6147 | for_each_tracing_cpu(cpu) { | |
6148 | memset(per_cpu_ptr(buf->data, cpu), 0, sizeof(struct trace_array_cpu)); | |
6149 | per_cpu_ptr(buf->data, cpu)->trace_cpu.cpu = cpu; | |
6150 | per_cpu_ptr(buf->data, cpu)->trace_cpu.tr = tr; | |
6151 | } | |
6152 | } | |
6153 | ||
55034cd6 SRRH |
6154 | static int |
6155 | allocate_trace_buffer(struct trace_array *tr, struct trace_buffer *buf, int size) | |
277ba044 SR |
6156 | { |
6157 | enum ring_buffer_flags rb_flags; | |
737223fb SRRH |
6158 | |
6159 | rb_flags = trace_flags & TRACE_ITER_OVERWRITE ? RB_FL_OVERWRITE : 0; | |
6160 | ||
fb23eaf4 SRRH |
6161 | buf->tr = tr; |
6162 | ||
55034cd6 SRRH |
6163 | buf->buffer = ring_buffer_alloc(size, rb_flags); |
6164 | if (!buf->buffer) | |
6165 | return -ENOMEM; | |
737223fb | 6166 | |
55034cd6 SRRH |
6167 | buf->data = alloc_percpu(struct trace_array_cpu); |
6168 | if (!buf->data) { | |
6169 | ring_buffer_free(buf->buffer); | |
6170 | return -ENOMEM; | |
6171 | } | |
737223fb | 6172 | |
55034cd6 | 6173 | init_trace_buffers(tr, buf); |
737223fb SRRH |
6174 | |
6175 | /* Allocate the first page for all buffers */ | |
6176 | set_buffer_entries(&tr->trace_buffer, | |
6177 | ring_buffer_size(tr->trace_buffer.buffer, 0)); | |
6178 | ||
55034cd6 SRRH |
6179 | return 0; |
6180 | } | |
737223fb | 6181 | |
55034cd6 SRRH |
6182 | static int allocate_trace_buffers(struct trace_array *tr, int size) |
6183 | { | |
6184 | int ret; | |
737223fb | 6185 | |
55034cd6 SRRH |
6186 | ret = allocate_trace_buffer(tr, &tr->trace_buffer, size); |
6187 | if (ret) | |
6188 | return ret; | |
737223fb | 6189 | |
55034cd6 SRRH |
6190 | #ifdef CONFIG_TRACER_MAX_TRACE |
6191 | ret = allocate_trace_buffer(tr, &tr->max_buffer, | |
6192 | allocate_snapshot ? size : 1); | |
6193 | if (WARN_ON(ret)) { | |
737223fb | 6194 | ring_buffer_free(tr->trace_buffer.buffer); |
55034cd6 SRRH |
6195 | free_percpu(tr->trace_buffer.data); |
6196 | return -ENOMEM; | |
6197 | } | |
6198 | tr->allocated_snapshot = allocate_snapshot; | |
737223fb | 6199 | |
55034cd6 SRRH |
6200 | /* |
6201 | * Only the top level trace array gets its snapshot allocated | |
6202 | * from the kernel command line. | |
6203 | */ | |
6204 | allocate_snapshot = false; | |
737223fb | 6205 | #endif |
55034cd6 | 6206 | return 0; |
737223fb SRRH |
6207 | } |
6208 | ||
6209 | static int new_instance_create(const char *name) | |
6210 | { | |
277ba044 SR |
6211 | struct trace_array *tr; |
6212 | int ret; | |
277ba044 SR |
6213 | |
6214 | mutex_lock(&trace_types_lock); | |
6215 | ||
6216 | ret = -EEXIST; | |
6217 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
6218 | if (tr->name && strcmp(tr->name, name) == 0) | |
6219 | goto out_unlock; | |
6220 | } | |
6221 | ||
6222 | ret = -ENOMEM; | |
6223 | tr = kzalloc(sizeof(*tr), GFP_KERNEL); | |
6224 | if (!tr) | |
6225 | goto out_unlock; | |
6226 | ||
6227 | tr->name = kstrdup(name, GFP_KERNEL); | |
6228 | if (!tr->name) | |
6229 | goto out_free_tr; | |
6230 | ||
6231 | raw_spin_lock_init(&tr->start_lock); | |
6232 | ||
6233 | tr->current_trace = &nop_trace; | |
6234 | ||
6235 | INIT_LIST_HEAD(&tr->systems); | |
6236 | INIT_LIST_HEAD(&tr->events); | |
6237 | ||
737223fb | 6238 | if (allocate_trace_buffers(tr, trace_buf_size) < 0) |
277ba044 SR |
6239 | goto out_free_tr; |
6240 | ||
277ba044 SR |
6241 | /* Holder for file callbacks */ |
6242 | tr->trace_cpu.cpu = RING_BUFFER_ALL_CPUS; | |
6243 | tr->trace_cpu.tr = tr; | |
6244 | ||
6245 | tr->dir = debugfs_create_dir(name, trace_instance_dir); | |
6246 | if (!tr->dir) | |
6247 | goto out_free_tr; | |
6248 | ||
6249 | ret = event_trace_add_tracer(tr->dir, tr); | |
a33eb1f5 AL |
6250 | if (ret) { |
6251 | debugfs_remove_recursive(tr->dir); | |
277ba044 | 6252 | goto out_free_tr; |
a33eb1f5 | 6253 | } |
277ba044 SR |
6254 | |
6255 | init_tracer_debugfs(tr, tr->dir); | |
6256 | ||
6257 | list_add(&tr->list, &ftrace_trace_arrays); | |
6258 | ||
6259 | mutex_unlock(&trace_types_lock); | |
6260 | ||
6261 | return 0; | |
6262 | ||
6263 | out_free_tr: | |
12883efb SRRH |
6264 | if (tr->trace_buffer.buffer) |
6265 | ring_buffer_free(tr->trace_buffer.buffer); | |
277ba044 SR |
6266 | kfree(tr->name); |
6267 | kfree(tr); | |
6268 | ||
6269 | out_unlock: | |
6270 | mutex_unlock(&trace_types_lock); | |
6271 | ||
6272 | return ret; | |
6273 | ||
6274 | } | |
6275 | ||
0c8916c3 SR |
6276 | static int instance_delete(const char *name) |
6277 | { | |
6278 | struct trace_array *tr; | |
6279 | int found = 0; | |
6280 | int ret; | |
6281 | ||
6282 | mutex_lock(&trace_types_lock); | |
6283 | ||
6284 | ret = -ENODEV; | |
6285 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
6286 | if (tr->name && strcmp(tr->name, name) == 0) { | |
6287 | found = 1; | |
6288 | break; | |
6289 | } | |
6290 | } | |
6291 | if (!found) | |
6292 | goto out_unlock; | |
6293 | ||
a695cb58 SRRH |
6294 | ret = -EBUSY; |
6295 | if (tr->ref) | |
6296 | goto out_unlock; | |
6297 | ||
0c8916c3 SR |
6298 | list_del(&tr->list); |
6299 | ||
6300 | event_trace_del_tracer(tr); | |
6301 | debugfs_remove_recursive(tr->dir); | |
12883efb SRRH |
6302 | free_percpu(tr->trace_buffer.data); |
6303 | ring_buffer_free(tr->trace_buffer.buffer); | |
0c8916c3 SR |
6304 | |
6305 | kfree(tr->name); | |
6306 | kfree(tr); | |
6307 | ||
6308 | ret = 0; | |
6309 | ||
6310 | out_unlock: | |
6311 | mutex_unlock(&trace_types_lock); | |
6312 | ||
6313 | return ret; | |
6314 | } | |
6315 | ||
277ba044 SR |
6316 | static int instance_mkdir (struct inode *inode, struct dentry *dentry, umode_t mode) |
6317 | { | |
6318 | struct dentry *parent; | |
6319 | int ret; | |
6320 | ||
6321 | /* Paranoid: Make sure the parent is the "instances" directory */ | |
6637ecd3 | 6322 | parent = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias); |
277ba044 SR |
6323 | if (WARN_ON_ONCE(parent != trace_instance_dir)) |
6324 | return -ENOENT; | |
6325 | ||
6326 | /* | |
6327 | * The inode mutex is locked, but debugfs_create_dir() will also | |
6328 | * take the mutex. As the instances directory can not be destroyed | |
6329 | * or changed in any other way, it is safe to unlock it, and | |
6330 | * let the dentry try. If two users try to make the same dir at | |
6331 | * the same time, then the new_instance_create() will determine the | |
6332 | * winner. | |
6333 | */ | |
6334 | mutex_unlock(&inode->i_mutex); | |
6335 | ||
6336 | ret = new_instance_create(dentry->d_iname); | |
6337 | ||
6338 | mutex_lock(&inode->i_mutex); | |
6339 | ||
6340 | return ret; | |
6341 | } | |
6342 | ||
0c8916c3 SR |
6343 | static int instance_rmdir(struct inode *inode, struct dentry *dentry) |
6344 | { | |
6345 | struct dentry *parent; | |
6346 | int ret; | |
6347 | ||
6348 | /* Paranoid: Make sure the parent is the "instances" directory */ | |
6637ecd3 | 6349 | parent = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias); |
0c8916c3 SR |
6350 | if (WARN_ON_ONCE(parent != trace_instance_dir)) |
6351 | return -ENOENT; | |
6352 | ||
6353 | /* The caller did a dget() on dentry */ | |
6354 | mutex_unlock(&dentry->d_inode->i_mutex); | |
6355 | ||
6356 | /* | |
6357 | * The inode mutex is locked, but debugfs_create_dir() will also | |
6358 | * take the mutex. As the instances directory can not be destroyed | |
6359 | * or changed in any other way, it is safe to unlock it, and | |
6360 | * let the dentry try. If two users try to make the same dir at | |
6361 | * the same time, then the instance_delete() will determine the | |
6362 | * winner. | |
6363 | */ | |
6364 | mutex_unlock(&inode->i_mutex); | |
6365 | ||
6366 | ret = instance_delete(dentry->d_iname); | |
6367 | ||
6368 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); | |
6369 | mutex_lock(&dentry->d_inode->i_mutex); | |
6370 | ||
6371 | return ret; | |
6372 | } | |
6373 | ||
277ba044 SR |
6374 | static const struct inode_operations instance_dir_inode_operations = { |
6375 | .lookup = simple_lookup, | |
6376 | .mkdir = instance_mkdir, | |
0c8916c3 | 6377 | .rmdir = instance_rmdir, |
277ba044 SR |
6378 | }; |
6379 | ||
6380 | static __init void create_trace_instances(struct dentry *d_tracer) | |
6381 | { | |
6382 | trace_instance_dir = debugfs_create_dir("instances", d_tracer); | |
6383 | if (WARN_ON(!trace_instance_dir)) | |
6384 | return; | |
6385 | ||
6386 | /* Hijack the dir inode operations, to allow mkdir */ | |
6387 | trace_instance_dir->d_inode->i_op = &instance_dir_inode_operations; | |
6388 | } | |
6389 | ||
2b6080f2 SR |
6390 | static void |
6391 | init_tracer_debugfs(struct trace_array *tr, struct dentry *d_tracer) | |
6392 | { | |
121aaee7 | 6393 | int cpu; |
2b6080f2 SR |
6394 | |
6395 | trace_create_file("trace_options", 0644, d_tracer, | |
6396 | tr, &tracing_iter_fops); | |
6397 | ||
6398 | trace_create_file("trace", 0644, d_tracer, | |
7272711a | 6399 | tr, &tracing_fops); |
2b6080f2 SR |
6400 | |
6401 | trace_create_file("trace_pipe", 0444, d_tracer, | |
23b625fa | 6402 | tr, &tracing_pipe_fops); |
2b6080f2 SR |
6403 | |
6404 | trace_create_file("buffer_size_kb", 0644, d_tracer, | |
e5dd03c4 | 6405 | tr, &tracing_entries_fops); |
2b6080f2 SR |
6406 | |
6407 | trace_create_file("buffer_total_size_kb", 0444, d_tracer, | |
6408 | tr, &tracing_total_entries_fops); | |
6409 | ||
6410 | trace_create_file("free_buffer", 0644, d_tracer, | |
6411 | tr, &tracing_free_buffer_fops); | |
6412 | ||
6413 | trace_create_file("trace_marker", 0220, d_tracer, | |
6414 | tr, &tracing_mark_fops); | |
6415 | ||
6fa3eb70 S |
6416 | trace_create_file("saved_tgids", 0444, d_tracer, |
6417 | tr, &tracing_saved_tgids_fops); | |
6418 | ||
2b6080f2 SR |
6419 | trace_create_file("trace_clock", 0644, d_tracer, tr, |
6420 | &trace_clock_fops); | |
6421 | ||
6422 | trace_create_file("tracing_on", 0644, d_tracer, | |
7272711a | 6423 | tr, &rb_simple_fops); |
ce9bae55 SRRH |
6424 | |
6425 | #ifdef CONFIG_TRACER_SNAPSHOT | |
6426 | trace_create_file("snapshot", 0644, d_tracer, | |
7272711a | 6427 | tr, &snapshot_fops); |
ce9bae55 | 6428 | #endif |
121aaee7 SRRH |
6429 | |
6430 | for_each_tracing_cpu(cpu) | |
6431 | tracing_init_debugfs_percpu(tr, cpu); | |
6432 | ||
2b6080f2 SR |
6433 | } |
6434 | ||
b5ad384e | 6435 | static __init int tracer_init_debugfs(void) |
bc0c38d1 SR |
6436 | { |
6437 | struct dentry *d_tracer; | |
bc0c38d1 | 6438 | |
7e53bd42 LJ |
6439 | trace_access_lock_init(); |
6440 | ||
bc0c38d1 | 6441 | d_tracer = tracing_init_dentry(); |
ed6f1c99 NK |
6442 | if (!d_tracer) |
6443 | return 0; | |
bc0c38d1 | 6444 | |
2b6080f2 | 6445 | init_tracer_debugfs(&global_trace, d_tracer); |
bc0c38d1 | 6446 | |
5452af66 | 6447 | trace_create_file("tracing_cpumask", 0644, d_tracer, |
2b6080f2 | 6448 | &global_trace, &tracing_cpumask_fops); |
a8259075 | 6449 | |
5452af66 FW |
6450 | trace_create_file("available_tracers", 0444, d_tracer, |
6451 | &global_trace, &show_traces_fops); | |
6452 | ||
339ae5d3 | 6453 | trace_create_file("current_tracer", 0644, d_tracer, |
5452af66 FW |
6454 | &global_trace, &set_tracer_fops); |
6455 | ||
5d4a9dba | 6456 | #ifdef CONFIG_TRACER_MAX_TRACE |
5452af66 FW |
6457 | trace_create_file("tracing_max_latency", 0644, d_tracer, |
6458 | &tracing_max_latency, &tracing_max_lat_fops); | |
0e950173 | 6459 | #endif |
5452af66 FW |
6460 | |
6461 | trace_create_file("tracing_thresh", 0644, d_tracer, | |
6462 | &tracing_thresh, &tracing_max_lat_fops); | |
a8259075 | 6463 | |
339ae5d3 | 6464 | trace_create_file("README", 0444, d_tracer, |
5452af66 FW |
6465 | NULL, &tracing_readme_fops); |
6466 | ||
69abe6a5 AP |
6467 | trace_create_file("saved_cmdlines", 0444, d_tracer, |
6468 | NULL, &tracing_saved_cmdlines_fops); | |
5bf9a1ee | 6469 | |
bc0c38d1 | 6470 | #ifdef CONFIG_DYNAMIC_FTRACE |
5452af66 FW |
6471 | trace_create_file("dyn_ftrace_total_info", 0444, d_tracer, |
6472 | &ftrace_update_tot_cnt, &tracing_dyn_info_fops); | |
bc0c38d1 | 6473 | #endif |
b04cc6b1 | 6474 | |
277ba044 | 6475 | create_trace_instances(d_tracer); |
5452af66 | 6476 | |
2b6080f2 | 6477 | create_trace_options_dir(&global_trace); |
b04cc6b1 | 6478 | |
b5ad384e | 6479 | return 0; |
bc0c38d1 SR |
6480 | } |
6481 | ||
3f5a54e3 SR |
6482 | static int trace_panic_handler(struct notifier_block *this, |
6483 | unsigned long event, void *unused) | |
6484 | { | |
944ac425 | 6485 | if (ftrace_dump_on_oops) |
cecbca96 | 6486 | ftrace_dump(ftrace_dump_on_oops); |
3f5a54e3 SR |
6487 | return NOTIFY_OK; |
6488 | } | |
6489 | ||
6490 | static struct notifier_block trace_panic_notifier = { | |
6491 | .notifier_call = trace_panic_handler, | |
6492 | .next = NULL, | |
6493 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ | |
6494 | }; | |
6495 | ||
6496 | static int trace_die_handler(struct notifier_block *self, | |
6497 | unsigned long val, | |
6498 | void *data) | |
6499 | { | |
6500 | switch (val) { | |
6501 | case DIE_OOPS: | |
944ac425 | 6502 | if (ftrace_dump_on_oops) |
cecbca96 | 6503 | ftrace_dump(ftrace_dump_on_oops); |
3f5a54e3 SR |
6504 | break; |
6505 | default: | |
6506 | break; | |
6507 | } | |
6508 | return NOTIFY_OK; | |
6509 | } | |
6510 | ||
6511 | static struct notifier_block trace_die_notifier = { | |
6512 | .notifier_call = trace_die_handler, | |
6513 | .priority = 200 | |
6514 | }; | |
6515 | ||
6516 | /* | |
6517 | * printk is set to max of 1024, we really don't need it that big. | |
6518 | * Nothing should be printing 1000 characters anyway. | |
6519 | */ | |
6520 | #define TRACE_MAX_PRINT 1000 | |
6521 | ||
6522 | /* | |
6523 | * Define here KERN_TRACE so that we have one place to modify | |
6524 | * it if we decide to change what log level the ftrace dump | |
6525 | * should be at. | |
6526 | */ | |
428aee14 | 6527 | #define KERN_TRACE KERN_EMERG |
3f5a54e3 | 6528 | |
955b61e5 | 6529 | void |
3f5a54e3 SR |
6530 | trace_printk_seq(struct trace_seq *s) |
6531 | { | |
6532 | /* Probably should print a warning here. */ | |
bd6df187 J |
6533 | if (s->len >= TRACE_MAX_PRINT) |
6534 | s->len = TRACE_MAX_PRINT; | |
3f5a54e3 SR |
6535 | |
6536 | /* should be zero ended, but we are paranoid. */ | |
6537 | s->buffer[s->len] = 0; | |
6538 | ||
6539 | printk(KERN_TRACE "%s", s->buffer); | |
6540 | ||
f9520750 | 6541 | trace_seq_init(s); |
3f5a54e3 SR |
6542 | } |
6543 | ||
955b61e5 JW |
6544 | void trace_init_global_iter(struct trace_iterator *iter) |
6545 | { | |
6546 | iter->tr = &global_trace; | |
2b6080f2 | 6547 | iter->trace = iter->tr->current_trace; |
ae3b5093 | 6548 | iter->cpu_file = RING_BUFFER_ALL_CPUS; |
12883efb | 6549 | iter->trace_buffer = &global_trace.trace_buffer; |
955b61e5 JW |
6550 | } |
6551 | ||
7fe70b57 | 6552 | void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) |
3f5a54e3 | 6553 | { |
3f5a54e3 SR |
6554 | /* use static because iter can be a bit big for the stack */ |
6555 | static struct trace_iterator iter; | |
7fe70b57 | 6556 | static atomic_t dump_running; |
cf586b61 | 6557 | unsigned int old_userobj; |
d769041f SR |
6558 | unsigned long flags; |
6559 | int cnt = 0, cpu; | |
3f5a54e3 | 6560 | |
7fe70b57 SRRH |
6561 | /* Only allow one dump user at a time. */ |
6562 | if (atomic_inc_return(&dump_running) != 1) { | |
6563 | atomic_dec(&dump_running); | |
6564 | return; | |
6565 | } | |
3f5a54e3 | 6566 | |
7fe70b57 SRRH |
6567 | /* |
6568 | * Always turn off tracing when we dump. | |
6569 | * We don't need to show trace output of what happens | |
6570 | * between multiple crashes. | |
6571 | * | |
6572 | * If the user does a sysrq-z, then they can re-enable | |
6573 | * tracing with echo 1 > tracing_on. | |
6574 | */ | |
0ee6b6cf | 6575 | tracing_off(); |
cf586b61 | 6576 | |
7fe70b57 | 6577 | local_irq_save(flags); |
3f5a54e3 | 6578 | |
38dbe0b1 | 6579 | /* Simulate the iterator */ |
955b61e5 JW |
6580 | trace_init_global_iter(&iter); |
6581 | ||
d769041f | 6582 | for_each_tracing_cpu(cpu) { |
12883efb | 6583 | atomic_inc(&per_cpu_ptr(iter.tr->trace_buffer.data, cpu)->disabled); |
d769041f SR |
6584 | } |
6585 | ||
cf586b61 FW |
6586 | old_userobj = trace_flags & TRACE_ITER_SYM_USEROBJ; |
6587 | ||
b54d3de9 TE |
6588 | /* don't look at user memory in panic mode */ |
6589 | trace_flags &= ~TRACE_ITER_SYM_USEROBJ; | |
6590 | ||
cecbca96 FW |
6591 | switch (oops_dump_mode) { |
6592 | case DUMP_ALL: | |
ae3b5093 | 6593 | iter.cpu_file = RING_BUFFER_ALL_CPUS; |
cecbca96 FW |
6594 | break; |
6595 | case DUMP_ORIG: | |
6596 | iter.cpu_file = raw_smp_processor_id(); | |
6597 | break; | |
6598 | case DUMP_NONE: | |
6599 | goto out_enable; | |
6600 | default: | |
6601 | printk(KERN_TRACE "Bad dumping mode, switching to all CPUs dump\n"); | |
ae3b5093 | 6602 | iter.cpu_file = RING_BUFFER_ALL_CPUS; |
cecbca96 FW |
6603 | } |
6604 | ||
6605 | printk(KERN_TRACE "Dumping ftrace buffer:\n"); | |
3f5a54e3 | 6606 | |
7fe70b57 SRRH |
6607 | /* Did function tracer already get disabled? */ |
6608 | if (ftrace_is_dead()) { | |
6609 | printk("# WARNING: FUNCTION TRACING IS CORRUPTED\n"); | |
6610 | printk("# MAY BE MISSING FUNCTION EVENTS\n"); | |
6611 | } | |
6612 | ||
3f5a54e3 SR |
6613 | /* |
6614 | * We need to stop all tracing on all CPUS to read the | |
6615 | * the next buffer. This is a bit expensive, but is | |
6616 | * not done often. We fill all what we can read, | |
6617 | * and then release the locks again. | |
6618 | */ | |
6619 | ||
3f5a54e3 SR |
6620 | while (!trace_empty(&iter)) { |
6621 | ||
6622 | if (!cnt) | |
6623 | printk(KERN_TRACE "---------------------------------\n"); | |
6624 | ||
6625 | cnt++; | |
6626 | ||
6627 | /* reset all but tr, trace, and overruns */ | |
6628 | memset(&iter.seq, 0, | |
6629 | sizeof(struct trace_iterator) - | |
6630 | offsetof(struct trace_iterator, seq)); | |
6631 | iter.iter_flags |= TRACE_FILE_LAT_FMT; | |
6632 | iter.pos = -1; | |
6633 | ||
955b61e5 | 6634 | if (trace_find_next_entry_inc(&iter) != NULL) { |
74e7ff8c LJ |
6635 | int ret; |
6636 | ||
6637 | ret = print_trace_line(&iter); | |
6638 | if (ret != TRACE_TYPE_NO_CONSUME) | |
6639 | trace_consume(&iter); | |
3f5a54e3 | 6640 | } |
b892e5c8 | 6641 | touch_nmi_watchdog(); |
3f5a54e3 SR |
6642 | |
6643 | trace_printk_seq(&iter.seq); | |
6644 | } | |
6645 | ||
6646 | if (!cnt) | |
6647 | printk(KERN_TRACE " (ftrace buffer empty)\n"); | |
6648 | else | |
6649 | printk(KERN_TRACE "---------------------------------\n"); | |
6650 | ||
cecbca96 | 6651 | out_enable: |
7fe70b57 | 6652 | trace_flags |= old_userobj; |
cf586b61 | 6653 | |
7fe70b57 SRRH |
6654 | for_each_tracing_cpu(cpu) { |
6655 | atomic_dec(&per_cpu_ptr(iter.trace_buffer->data, cpu)->disabled); | |
cf586b61 | 6656 | } |
7fe70b57 | 6657 | atomic_dec(&dump_running); |
cd891ae0 | 6658 | local_irq_restore(flags); |
3f5a54e3 | 6659 | } |
a8eecf22 | 6660 | EXPORT_SYMBOL_GPL(ftrace_dump); |
cf586b61 | 6661 | |
3928a8a2 | 6662 | __init static int tracer_alloc_buffers(void) |
bc0c38d1 | 6663 | { |
73c5162a | 6664 | int ring_buf_size; |
9e01c1b7 | 6665 | int ret = -ENOMEM; |
4c11d7ae | 6666 | |
750912fa | 6667 | |
9e01c1b7 RR |
6668 | if (!alloc_cpumask_var(&tracing_buffer_mask, GFP_KERNEL)) |
6669 | goto out; | |
6670 | ||
6671 | if (!alloc_cpumask_var(&tracing_cpumask, GFP_KERNEL)) | |
6672 | goto out_free_buffer_mask; | |
4c11d7ae | 6673 | |
07d777fe SR |
6674 | /* Only allocate trace_printk buffers if a trace_printk exists */ |
6675 | if (__stop___trace_bprintk_fmt != __start___trace_bprintk_fmt) | |
81698831 | 6676 | /* Must be called before global_trace.buffer is allocated */ |
6fa3eb70 | 6677 | trace_printk_init_buffers(); |
07d777fe | 6678 | |
73c5162a SR |
6679 | /* To save memory, keep the ring buffer size to its minimum */ |
6680 | if (ring_buffer_expanded) | |
6681 | ring_buf_size = trace_buf_size; | |
6682 | else | |
6683 | ring_buf_size = 1; | |
6684 | ||
9e01c1b7 RR |
6685 | cpumask_copy(tracing_buffer_mask, cpu_possible_mask); |
6686 | cpumask_copy(tracing_cpumask, cpu_all_mask); | |
6687 | ||
2b6080f2 SR |
6688 | raw_spin_lock_init(&global_trace.start_lock); |
6689 | ||
9e01c1b7 | 6690 | /* TODO: make the number of buffers hot pluggable with CPUS */ |
737223fb | 6691 | if (allocate_trace_buffers(&global_trace, ring_buf_size) < 0) { |
3928a8a2 SR |
6692 | printk(KERN_ERR "tracer: failed to allocate ring buffer!\n"); |
6693 | WARN_ON(1); | |
9e01c1b7 | 6694 | goto out_free_cpumask; |
4c11d7ae | 6695 | } |
a7603ff4 | 6696 | |
499e5470 SR |
6697 | if (global_trace.buffer_disabled) |
6698 | tracing_off(); | |
4c11d7ae | 6699 | |
bc0c38d1 SR |
6700 | trace_init_cmdlines(); |
6701 | ||
ca164318 SRRH |
6702 | /* |
6703 | * register_tracer() might reference current_trace, so it | |
6704 | * needs to be set before we register anything. This is | |
6705 | * just a bootstrap of current_trace anyway. | |
6706 | */ | |
2b6080f2 SR |
6707 | global_trace.current_trace = &nop_trace; |
6708 | ||
ca164318 SRRH |
6709 | register_tracer(&nop_trace); |
6710 | ||
60a11774 SR |
6711 | /* All seems OK, enable tracing */ |
6712 | tracing_disabled = 0; | |
3928a8a2 | 6713 | |
3f5a54e3 SR |
6714 | atomic_notifier_chain_register(&panic_notifier_list, |
6715 | &trace_panic_notifier); | |
6716 | ||
6717 | register_die_notifier(&trace_die_notifier); | |
2fc1dfbe | 6718 | |
ae63b31e SR |
6719 | global_trace.flags = TRACE_ARRAY_FL_GLOBAL; |
6720 | ||
2b6080f2 SR |
6721 | /* Holder for file callbacks */ |
6722 | global_trace.trace_cpu.cpu = RING_BUFFER_ALL_CPUS; | |
6723 | global_trace.trace_cpu.tr = &global_trace; | |
6724 | ||
ae63b31e SR |
6725 | INIT_LIST_HEAD(&global_trace.systems); |
6726 | INIT_LIST_HEAD(&global_trace.events); | |
6727 | list_add(&global_trace.list, &ftrace_trace_arrays); | |
6728 | ||
7bcfaf54 SR |
6729 | while (trace_boot_options) { |
6730 | char *option; | |
6731 | ||
6732 | option = strsep(&trace_boot_options, ","); | |
2b6080f2 | 6733 | trace_set_options(&global_trace, option); |
7bcfaf54 SR |
6734 | } |
6735 | ||
77fd5c15 SRRH |
6736 | register_snapshot_cmd(); |
6737 | ||
2fc1dfbe | 6738 | return 0; |
3f5a54e3 | 6739 | |
9e01c1b7 | 6740 | out_free_cpumask: |
12883efb SRRH |
6741 | free_percpu(global_trace.trace_buffer.data); |
6742 | #ifdef CONFIG_TRACER_MAX_TRACE | |
6743 | free_percpu(global_trace.max_buffer.data); | |
6744 | #endif | |
9e01c1b7 RR |
6745 | free_cpumask_var(tracing_cpumask); |
6746 | out_free_buffer_mask: | |
6747 | free_cpumask_var(tracing_buffer_mask); | |
6748 | out: | |
6749 | return ret; | |
bc0c38d1 | 6750 | } |
b2821ae6 SR |
6751 | |
6752 | __init static int clear_boot_tracer(void) | |
6753 | { | |
6754 | /* | |
6755 | * The default tracer at boot buffer is an init section. | |
6756 | * This function is called in lateinit. If we did not | |
6757 | * find the boot tracer, then clear it out, to prevent | |
6758 | * later registration from accessing the buffer that is | |
6759 | * about to be freed. | |
6760 | */ | |
6761 | if (!default_bootup_tracer) | |
6762 | return 0; | |
6763 | ||
6764 | printk(KERN_INFO "ftrace bootup tracer '%s' not registered.\n", | |
6765 | default_bootup_tracer); | |
6766 | default_bootup_tracer = NULL; | |
6767 | ||
6768 | return 0; | |
6769 | } | |
6770 | ||
b5ad384e FW |
6771 | early_initcall(tracer_alloc_buffers); |
6772 | fs_initcall(tracer_init_debugfs); | |
b2821ae6 | 6773 | late_initcall(clear_boot_tracer); |