trace_output.c 31 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991001011021031041051061071081091101111121131141151161171181191201211221231241251261271281291301311321331341351361371381391401411421431441451461471481491501511521531541551561571581591601611621631641651661671681691701711721731741751761771781791801811821831841851861871881891901911921931941951961971981992002012022032042052062072082092102112122132142152162172182192202212222232242252262272282292302312322332342352362372382392402412422432442452462472482492502512522532542552562572582592602612622632642652662672682692702712722732742752762772782792802812822832842852862872882892902912922932942952962972982993003013023033043053063073083093103113123133143153163173183193203213223233243253263273283293303313323333343353363373383393403413423433443453463473483493503513523533543553563573583593603613623633643653663673683693703713723733743753763773783793803813823833843853863873883893903913923933943953963973983994004014024034044054064074084094104114124134144154164174184194204214224234244254264274284294304314324334344354364374384394404414424434444454464474484494504514524534544554564574584594604614624634644654664674684694704714724734744754764774784794804814824834844854864874884894904914924934944954964974984995005015025035045055065075085095105115125135145155165175185195205215225235245255265275285295305315325335345355365375385395405415425435445455465475485495505515525535545555565575585595605615625635645655665675685695705715725735745755765775785795805815825835845855865875885895905915925935945955965975985996006016026036046056066076086096106116126136146156166176186196206216226236246256266276286296306316326336346356366376386396406416426436446456466476486496506516526536546556566576586596606616626636646656666676686696706716726736746756766776786796806816826836846856866876886896906916926936946956966976986997007017027037047057067077087097107117127137147157167177187197207217227237247257267277287297307317327337347357367377387397407417427437447457467477487497507517527537547557567577587597607617627637647657667677687697707717727737747757767777787797807817827837847857867877887897907917927937947957967977987998008018028038048058068078088098108118128138148158168178188198208218228238248258268278288298308318328338348358368378388398408418428438448458468478488498508518528538548558568578588598608618628638648658668678688698708718728738748758768778788798808818828838848858868878888898908918928938948958968978988999009019029039049059069079089099109119129139149159169179189199209219229239249259269279289299309319329339349359369379389399409419429439449459469479489499509519529539549559569579589599609619629639649659669679689699709719729739749759769779789799809819829839849859869879889899909919929939949959969979989991000100110021003100410051006100710081009101010111012101310141015101610171018101910201021102210231024102510261027102810291030103110321033103410351036103710381039104010411042104310441045104610471048104910501051105210531054105510561057105810591060106110621063106410651066106710681069107010711072107310741075107610771078107910801081108210831084108510861087108810891090109110921093109410951096109710981099110011011102110311041105110611071108110911101111111211131114111511161117111811191120112111221123112411251126112711281129113011311132113311341135113611371138113911401141114211431144114511461147114811491150115111521153115411551156115711581159116011611162116311641165116611671168116911701171117211731174117511761177117811791180118111821183118411851186118711881189119011911192119311941195119611971198119912001201120212031204120512061207120812091210121112121213121412151216121712181219122012211222122312241225122612271228122912301231123212331234123512361237123812391240124112421243124412451246124712481249125012511252125312541255125612571258125912601261126212631264126512661267126812691270127112721273127412751276127712781279128012811282128312841285128612871288128912901291129212931294129512961297129812991300130113021303130413051306130713081309131013111312131313141315131613171318131913201321132213231324132513261327132813291330133113321333133413351336133713381339134013411342134313441345134613471348134913501351135213531354135513561357135813591360136113621363136413651366136713681369137013711372137313741375137613771378137913801381138213831384138513861387138813891390139113921393139413951396139713981399
  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * trace_output.c
  4. *
  5. * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
  6. *
  7. */
  8. #include <linux/module.h>
  9. #include <linux/mutex.h>
  10. #include <linux/ftrace.h>
  11. #include <linux/sched/clock.h>
  12. #include <linux/sched/mm.h>
  13. #include "trace_output.h"
  14. /* must be a power of 2 */
  15. #define EVENT_HASHSIZE 128
  16. DECLARE_RWSEM(trace_event_sem);
  17. static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
  18. static int next_event_type = __TRACE_LAST_TYPE;
  19. enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
  20. {
  21. struct trace_seq *s = &iter->seq;
  22. struct trace_entry *entry = iter->ent;
  23. struct bputs_entry *field;
  24. trace_assign_type(field, entry);
  25. trace_seq_puts(s, field->str);
  26. return trace_handle_return(s);
  27. }
  28. enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
  29. {
  30. struct trace_seq *s = &iter->seq;
  31. struct trace_entry *entry = iter->ent;
  32. struct bprint_entry *field;
  33. trace_assign_type(field, entry);
  34. trace_seq_bprintf(s, field->fmt, field->buf);
  35. return trace_handle_return(s);
  36. }
  37. enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
  38. {
  39. struct trace_seq *s = &iter->seq;
  40. struct trace_entry *entry = iter->ent;
  41. struct print_entry *field;
  42. trace_assign_type(field, entry);
  43. trace_seq_puts(s, field->buf);
  44. return trace_handle_return(s);
  45. }
  46. const char *
  47. trace_print_flags_seq(struct trace_seq *p, const char *delim,
  48. unsigned long flags,
  49. const struct trace_print_flags *flag_array)
  50. {
  51. unsigned long mask;
  52. const char *str;
  53. const char *ret = trace_seq_buffer_ptr(p);
  54. int i, first = 1;
  55. for (i = 0; flag_array[i].name && flags; i++) {
  56. mask = flag_array[i].mask;
  57. if ((flags & mask) != mask)
  58. continue;
  59. str = flag_array[i].name;
  60. flags &= ~mask;
  61. if (!first && delim)
  62. trace_seq_puts(p, delim);
  63. else
  64. first = 0;
  65. trace_seq_puts(p, str);
  66. }
  67. /* check for left over flags */
  68. if (flags) {
  69. if (!first && delim)
  70. trace_seq_puts(p, delim);
  71. trace_seq_printf(p, "0x%lx", flags);
  72. }
  73. trace_seq_putc(p, 0);
  74. return ret;
  75. }
  76. EXPORT_SYMBOL(trace_print_flags_seq);
  77. const char *
  78. trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
  79. const struct trace_print_flags *symbol_array)
  80. {
  81. int i;
  82. const char *ret = trace_seq_buffer_ptr(p);
  83. for (i = 0; symbol_array[i].name; i++) {
  84. if (val != symbol_array[i].mask)
  85. continue;
  86. trace_seq_puts(p, symbol_array[i].name);
  87. break;
  88. }
  89. if (ret == (const char *)(trace_seq_buffer_ptr(p)))
  90. trace_seq_printf(p, "0x%lx", val);
  91. trace_seq_putc(p, 0);
  92. return ret;
  93. }
  94. EXPORT_SYMBOL(trace_print_symbols_seq);
  95. #if BITS_PER_LONG == 32
  96. const char *
  97. trace_print_flags_seq_u64(struct trace_seq *p, const char *delim,
  98. unsigned long long flags,
  99. const struct trace_print_flags_u64 *flag_array)
  100. {
  101. unsigned long long mask;
  102. const char *str;
  103. const char *ret = trace_seq_buffer_ptr(p);
  104. int i, first = 1;
  105. for (i = 0; flag_array[i].name && flags; i++) {
  106. mask = flag_array[i].mask;
  107. if ((flags & mask) != mask)
  108. continue;
  109. str = flag_array[i].name;
  110. flags &= ~mask;
  111. if (!first && delim)
  112. trace_seq_puts(p, delim);
  113. else
  114. first = 0;
  115. trace_seq_puts(p, str);
  116. }
  117. /* check for left over flags */
  118. if (flags) {
  119. if (!first && delim)
  120. trace_seq_puts(p, delim);
  121. trace_seq_printf(p, "0x%llx", flags);
  122. }
  123. trace_seq_putc(p, 0);
  124. return ret;
  125. }
  126. EXPORT_SYMBOL(trace_print_flags_seq_u64);
  127. const char *
  128. trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
  129. const struct trace_print_flags_u64 *symbol_array)
  130. {
  131. int i;
  132. const char *ret = trace_seq_buffer_ptr(p);
  133. for (i = 0; symbol_array[i].name; i++) {
  134. if (val != symbol_array[i].mask)
  135. continue;
  136. trace_seq_puts(p, symbol_array[i].name);
  137. break;
  138. }
  139. if (ret == (const char *)(trace_seq_buffer_ptr(p)))
  140. trace_seq_printf(p, "0x%llx", val);
  141. trace_seq_putc(p, 0);
  142. return ret;
  143. }
  144. EXPORT_SYMBOL(trace_print_symbols_seq_u64);
  145. #endif
  146. const char *
  147. trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
  148. unsigned int bitmask_size)
  149. {
  150. const char *ret = trace_seq_buffer_ptr(p);
  151. trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
  152. trace_seq_putc(p, 0);
  153. return ret;
  154. }
  155. EXPORT_SYMBOL_GPL(trace_print_bitmask_seq);
  156. /**
  157. * trace_print_hex_seq - print buffer as hex sequence
  158. * @p: trace seq struct to write to
  159. * @buf: The buffer to print
  160. * @buf_len: Length of @buf in bytes
  161. * @concatenate: Print @buf as single hex string or with spacing
  162. *
  163. * Prints the passed buffer as a hex sequence either as a whole,
  164. * single hex string if @concatenate is true or with spacing after
  165. * each byte in case @concatenate is false.
  166. */
  167. const char *
  168. trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len,
  169. bool concatenate)
  170. {
  171. int i;
  172. const char *ret = trace_seq_buffer_ptr(p);
  173. const char *fmt = concatenate ? "%*phN" : "%*ph";
  174. for (i = 0; i < buf_len; i += 16)
  175. trace_seq_printf(p, fmt, min(buf_len - i, 16), &buf[i]);
  176. trace_seq_putc(p, 0);
  177. return ret;
  178. }
  179. EXPORT_SYMBOL(trace_print_hex_seq);
  180. const char *
  181. trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
  182. size_t el_size)
  183. {
  184. const char *ret = trace_seq_buffer_ptr(p);
  185. const char *prefix = "";
  186. void *ptr = (void *)buf;
  187. size_t buf_len = count * el_size;
  188. trace_seq_putc(p, '{');
  189. while (ptr < buf + buf_len) {
  190. switch (el_size) {
  191. case 1:
  192. trace_seq_printf(p, "%s0x%x", prefix,
  193. *(u8 *)ptr);
  194. break;
  195. case 2:
  196. trace_seq_printf(p, "%s0x%x", prefix,
  197. *(u16 *)ptr);
  198. break;
  199. case 4:
  200. trace_seq_printf(p, "%s0x%x", prefix,
  201. *(u32 *)ptr);
  202. break;
  203. case 8:
  204. trace_seq_printf(p, "%s0x%llx", prefix,
  205. *(u64 *)ptr);
  206. break;
  207. default:
  208. trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
  209. *(u8 *)ptr);
  210. el_size = 1;
  211. }
  212. prefix = ",";
  213. ptr += el_size;
  214. }
  215. trace_seq_putc(p, '}');
  216. trace_seq_putc(p, 0);
  217. return ret;
  218. }
  219. EXPORT_SYMBOL(trace_print_array_seq);
  220. const char *
  221. trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str,
  222. int prefix_type, int rowsize, int groupsize,
  223. const void *buf, size_t len, bool ascii)
  224. {
  225. const char *ret = trace_seq_buffer_ptr(p);
  226. trace_seq_putc(p, '\n');
  227. trace_seq_hex_dump(p, prefix_str, prefix_type,
  228. rowsize, groupsize, buf, len, ascii);
  229. trace_seq_putc(p, 0);
  230. return ret;
  231. }
  232. EXPORT_SYMBOL(trace_print_hex_dump_seq);
  233. int trace_raw_output_prep(struct trace_iterator *iter,
  234. struct trace_event *trace_event)
  235. {
  236. struct trace_event_call *event;
  237. struct trace_seq *s = &iter->seq;
  238. struct trace_seq *p = &iter->tmp_seq;
  239. struct trace_entry *entry;
  240. event = container_of(trace_event, struct trace_event_call, event);
  241. entry = iter->ent;
  242. if (entry->type != event->event.type) {
  243. WARN_ON_ONCE(1);
  244. return TRACE_TYPE_UNHANDLED;
  245. }
  246. trace_seq_init(p);
  247. trace_seq_printf(s, "%s: ", trace_event_name(event));
  248. return trace_handle_return(s);
  249. }
  250. EXPORT_SYMBOL(trace_raw_output_prep);
  251. static int trace_output_raw(struct trace_iterator *iter, char *name,
  252. char *fmt, va_list ap)
  253. {
  254. struct trace_seq *s = &iter->seq;
  255. trace_seq_printf(s, "%s: ", name);
  256. trace_seq_vprintf(s, fmt, ap);
  257. return trace_handle_return(s);
  258. }
  259. int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
  260. {
  261. va_list ap;
  262. int ret;
  263. va_start(ap, fmt);
  264. ret = trace_output_raw(iter, name, fmt, ap);
  265. va_end(ap);
  266. return ret;
  267. }
  268. EXPORT_SYMBOL_GPL(trace_output_call);
  269. #ifdef CONFIG_KRETPROBES
  270. static inline const char *kretprobed(const char *name)
  271. {
  272. static const char tramp_name[] = "kretprobe_trampoline";
  273. int size = sizeof(tramp_name);
  274. if (strncmp(tramp_name, name, size) == 0)
  275. return "[unknown/kretprobe'd]";
  276. return name;
  277. }
  278. #else
  279. static inline const char *kretprobed(const char *name)
  280. {
  281. return name;
  282. }
  283. #endif /* CONFIG_KRETPROBES */
  284. static void
  285. seq_print_sym(struct trace_seq *s, unsigned long address, bool offset)
  286. {
  287. #ifdef CONFIG_KALLSYMS
  288. char str[KSYM_SYMBOL_LEN];
  289. const char *name;
  290. if (offset)
  291. sprint_symbol(str, address);
  292. else
  293. kallsyms_lookup(address, NULL, NULL, NULL, str);
  294. name = kretprobed(str);
  295. if (name && strlen(name)) {
  296. trace_seq_puts(s, name);
  297. return;
  298. }
  299. #endif
  300. trace_seq_printf(s, "0x%08lx", address);
  301. }
  302. #ifndef CONFIG_64BIT
  303. # define IP_FMT "%08lx"
  304. #else
  305. # define IP_FMT "%016lx"
  306. #endif
  307. static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
  308. unsigned long ip, unsigned long sym_flags)
  309. {
  310. struct file *file = NULL;
  311. unsigned long vmstart = 0;
  312. int ret = 1;
  313. if (s->full)
  314. return 0;
  315. if (mm) {
  316. const struct vm_area_struct *vma;
  317. mmap_read_lock(mm);
  318. vma = find_vma(mm, ip);
  319. if (vma) {
  320. file = vma->vm_file;
  321. vmstart = vma->vm_start;
  322. }
  323. if (file) {
  324. ret = trace_seq_path(s, &file->f_path);
  325. if (ret)
  326. trace_seq_printf(s, "[+0x%lx]",
  327. ip - vmstart);
  328. }
  329. mmap_read_unlock(mm);
  330. }
  331. if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
  332. trace_seq_printf(s, " <" IP_FMT ">", ip);
  333. return !trace_seq_has_overflowed(s);
  334. }
  335. int
  336. seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
  337. {
  338. if (!ip) {
  339. trace_seq_putc(s, '0');
  340. goto out;
  341. }
  342. seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET);
  343. if (sym_flags & TRACE_ITER_SYM_ADDR)
  344. trace_seq_printf(s, " <" IP_FMT ">", ip);
  345. out:
  346. return !trace_seq_has_overflowed(s);
  347. }
  348. /**
  349. * trace_print_lat_fmt - print the irq, preempt and lockdep fields
  350. * @s: trace seq struct to write to
  351. * @entry: The trace entry field from the ring buffer
  352. *
  353. * Prints the generic fields of irqs off, in hard or softirq, preempt
  354. * count.
  355. */
  356. int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
  357. {
  358. char hardsoft_irq;
  359. char need_resched;
  360. char irqs_off;
  361. int hardirq;
  362. int softirq;
  363. int nmi;
  364. nmi = entry->flags & TRACE_FLAG_NMI;
  365. hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
  366. softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
  367. irqs_off =
  368. (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
  369. (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
  370. '.';
  371. switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
  372. TRACE_FLAG_PREEMPT_RESCHED)) {
  373. case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
  374. need_resched = 'N';
  375. break;
  376. case TRACE_FLAG_NEED_RESCHED:
  377. need_resched = 'n';
  378. break;
  379. case TRACE_FLAG_PREEMPT_RESCHED:
  380. need_resched = 'p';
  381. break;
  382. default:
  383. need_resched = '.';
  384. break;
  385. }
  386. hardsoft_irq =
  387. (nmi && hardirq) ? 'Z' :
  388. nmi ? 'z' :
  389. (hardirq && softirq) ? 'H' :
  390. hardirq ? 'h' :
  391. softirq ? 's' :
  392. '.' ;
  393. trace_seq_printf(s, "%c%c%c",
  394. irqs_off, need_resched, hardsoft_irq);
  395. if (entry->preempt_count)
  396. trace_seq_printf(s, "%x", entry->preempt_count);
  397. else
  398. trace_seq_putc(s, '.');
  399. return !trace_seq_has_overflowed(s);
  400. }
  401. static int
  402. lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
  403. {
  404. char comm[TASK_COMM_LEN];
  405. trace_find_cmdline(entry->pid, comm);
  406. trace_seq_printf(s, "%8.8s-%-7d %3d",
  407. comm, entry->pid, cpu);
  408. return trace_print_lat_fmt(s, entry);
  409. }
  410. #undef MARK
  411. #define MARK(v, s) {.val = v, .sym = s}
  412. /* trace overhead mark */
  413. static const struct trace_mark {
  414. unsigned long long val; /* unit: nsec */
  415. char sym;
  416. } mark[] = {
  417. MARK(1000000000ULL , '$'), /* 1 sec */
  418. MARK(100000000ULL , '@'), /* 100 msec */
  419. MARK(10000000ULL , '*'), /* 10 msec */
  420. MARK(1000000ULL , '#'), /* 1000 usecs */
  421. MARK(100000ULL , '!'), /* 100 usecs */
  422. MARK(10000ULL , '+'), /* 10 usecs */
  423. };
  424. #undef MARK
  425. char trace_find_mark(unsigned long long d)
  426. {
  427. int i;
  428. int size = ARRAY_SIZE(mark);
  429. for (i = 0; i < size; i++) {
  430. if (d > mark[i].val)
  431. break;
  432. }
  433. return (i == size) ? ' ' : mark[i].sym;
  434. }
  435. static int
  436. lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
  437. {
  438. struct trace_array *tr = iter->tr;
  439. unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
  440. unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
  441. unsigned long long abs_ts = iter->ts - iter->array_buffer->time_start;
  442. unsigned long long rel_ts = next_ts - iter->ts;
  443. struct trace_seq *s = &iter->seq;
  444. if (in_ns) {
  445. abs_ts = ns2usecs(abs_ts);
  446. rel_ts = ns2usecs(rel_ts);
  447. }
  448. if (verbose && in_ns) {
  449. unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
  450. unsigned long abs_msec = (unsigned long)abs_ts;
  451. unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
  452. unsigned long rel_msec = (unsigned long)rel_ts;
  453. trace_seq_printf(
  454. s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
  455. ns2usecs(iter->ts),
  456. abs_msec, abs_usec,
  457. rel_msec, rel_usec);
  458. } else if (verbose && !in_ns) {
  459. trace_seq_printf(
  460. s, "[%016llx] %lld (+%lld): ",
  461. iter->ts, abs_ts, rel_ts);
  462. } else if (!verbose && in_ns) {
  463. trace_seq_printf(
  464. s, " %4lldus%c: ",
  465. abs_ts,
  466. trace_find_mark(rel_ts * NSEC_PER_USEC));
  467. } else { /* !verbose && !in_ns */
  468. trace_seq_printf(s, " %4lld: ", abs_ts);
  469. }
  470. return !trace_seq_has_overflowed(s);
  471. }
  472. int trace_print_context(struct trace_iterator *iter)
  473. {
  474. struct trace_array *tr = iter->tr;
  475. struct trace_seq *s = &iter->seq;
  476. struct trace_entry *entry = iter->ent;
  477. unsigned long long t;
  478. unsigned long secs, usec_rem;
  479. char comm[TASK_COMM_LEN];
  480. trace_find_cmdline(entry->pid, comm);
  481. trace_seq_printf(s, "%16s-%-7d ", comm, entry->pid);
  482. if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
  483. unsigned int tgid = trace_find_tgid(entry->pid);
  484. if (!tgid)
  485. trace_seq_printf(s, "(-------) ");
  486. else
  487. trace_seq_printf(s, "(%7d) ", tgid);
  488. }
  489. trace_seq_printf(s, "[%03d] ", iter->cpu);
  490. if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
  491. trace_print_lat_fmt(s, entry);
  492. if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
  493. t = ns2usecs(iter->ts);
  494. usec_rem = do_div(t, USEC_PER_SEC);
  495. secs = (unsigned long)t;
  496. trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
  497. } else
  498. trace_seq_printf(s, " %12llu: ", iter->ts);
  499. return !trace_seq_has_overflowed(s);
  500. }
  501. int trace_print_lat_context(struct trace_iterator *iter)
  502. {
  503. struct trace_entry *entry, *next_entry;
  504. struct trace_array *tr = iter->tr;
  505. struct trace_seq *s = &iter->seq;
  506. unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
  507. u64 next_ts;
  508. next_entry = trace_find_next_entry(iter, NULL, &next_ts);
  509. if (!next_entry)
  510. next_ts = iter->ts;
  511. /* trace_find_next_entry() may change iter->ent */
  512. entry = iter->ent;
  513. if (verbose) {
  514. char comm[TASK_COMM_LEN];
  515. trace_find_cmdline(entry->pid, comm);
  516. trace_seq_printf(
  517. s, "%16s %7d %3d %d %08x %08lx ",
  518. comm, entry->pid, iter->cpu, entry->flags,
  519. entry->preempt_count, iter->idx);
  520. } else {
  521. lat_print_generic(s, entry, iter->cpu);
  522. }
  523. lat_print_timestamp(iter, next_ts);
  524. return !trace_seq_has_overflowed(s);
  525. }
  526. /**
  527. * ftrace_find_event - find a registered event
  528. * @type: the type of event to look for
  529. *
  530. * Returns an event of type @type otherwise NULL
  531. * Called with trace_event_read_lock() held.
  532. */
  533. struct trace_event *ftrace_find_event(int type)
  534. {
  535. struct trace_event *event;
  536. unsigned key;
  537. key = type & (EVENT_HASHSIZE - 1);
  538. hlist_for_each_entry(event, &event_hash[key], node) {
  539. if (event->type == type)
  540. return event;
  541. }
  542. return NULL;
  543. }
  544. static LIST_HEAD(ftrace_event_list);
  545. static int trace_search_list(struct list_head **list)
  546. {
  547. struct trace_event *e;
  548. int next = __TRACE_LAST_TYPE;
  549. if (list_empty(&ftrace_event_list)) {
  550. *list = &ftrace_event_list;
  551. return next;
  552. }
  553. /*
  554. * We used up all possible max events,
  555. * lets see if somebody freed one.
  556. */
  557. list_for_each_entry(e, &ftrace_event_list, list) {
  558. if (e->type != next)
  559. break;
  560. next++;
  561. }
  562. /* Did we used up all 65 thousand events??? */
  563. if (next > TRACE_EVENT_TYPE_MAX)
  564. return 0;
  565. *list = &e->list;
  566. return next;
  567. }
  568. void trace_event_read_lock(void)
  569. {
  570. down_read(&trace_event_sem);
  571. }
  572. void trace_event_read_unlock(void)
  573. {
  574. up_read(&trace_event_sem);
  575. }
  576. /**
  577. * register_trace_event - register output for an event type
  578. * @event: the event type to register
  579. *
  580. * Event types are stored in a hash and this hash is used to
  581. * find a way to print an event. If the @event->type is set
  582. * then it will use that type, otherwise it will assign a
  583. * type to use.
  584. *
  585. * If you assign your own type, please make sure it is added
  586. * to the trace_type enum in trace.h, to avoid collisions
  587. * with the dynamic types.
  588. *
  589. * Returns the event type number or zero on error.
  590. */
  591. int register_trace_event(struct trace_event *event)
  592. {
  593. unsigned key;
  594. int ret = 0;
  595. down_write(&trace_event_sem);
  596. if (WARN_ON(!event))
  597. goto out;
  598. if (WARN_ON(!event->funcs))
  599. goto out;
  600. INIT_LIST_HEAD(&event->list);
  601. if (!event->type) {
  602. struct list_head *list = NULL;
  603. if (next_event_type > TRACE_EVENT_TYPE_MAX) {
  604. event->type = trace_search_list(&list);
  605. if (!event->type)
  606. goto out;
  607. } else {
  608. event->type = next_event_type++;
  609. list = &ftrace_event_list;
  610. }
  611. if (WARN_ON(ftrace_find_event(event->type)))
  612. goto out;
  613. list_add_tail(&event->list, list);
  614. } else if (event->type > __TRACE_LAST_TYPE) {
  615. printk(KERN_WARNING "Need to add type to trace.h\n");
  616. WARN_ON(1);
  617. goto out;
  618. } else {
  619. /* Is this event already used */
  620. if (ftrace_find_event(event->type))
  621. goto out;
  622. }
  623. if (event->funcs->trace == NULL)
  624. event->funcs->trace = trace_nop_print;
  625. if (event->funcs->raw == NULL)
  626. event->funcs->raw = trace_nop_print;
  627. if (event->funcs->hex == NULL)
  628. event->funcs->hex = trace_nop_print;
  629. if (event->funcs->binary == NULL)
  630. event->funcs->binary = trace_nop_print;
  631. key = event->type & (EVENT_HASHSIZE - 1);
  632. hlist_add_head(&event->node, &event_hash[key]);
  633. ret = event->type;
  634. out:
  635. up_write(&trace_event_sem);
  636. return ret;
  637. }
  638. EXPORT_SYMBOL_GPL(register_trace_event);
  639. /*
  640. * Used by module code with the trace_event_sem held for write.
  641. */
  642. int __unregister_trace_event(struct trace_event *event)
  643. {
  644. hlist_del(&event->node);
  645. list_del(&event->list);
  646. return 0;
  647. }
  648. /**
  649. * unregister_trace_event - remove a no longer used event
  650. * @event: the event to remove
  651. */
  652. int unregister_trace_event(struct trace_event *event)
  653. {
  654. down_write(&trace_event_sem);
  655. __unregister_trace_event(event);
  656. up_write(&trace_event_sem);
  657. return 0;
  658. }
  659. EXPORT_SYMBOL_GPL(unregister_trace_event);
  660. /*
  661. * Standard events
  662. */
  663. enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
  664. struct trace_event *event)
  665. {
  666. trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
  667. return trace_handle_return(&iter->seq);
  668. }
  669. /* TRACE_FN */
  670. static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
  671. struct trace_event *event)
  672. {
  673. struct ftrace_entry *field;
  674. struct trace_seq *s = &iter->seq;
  675. trace_assign_type(field, iter->ent);
  676. seq_print_ip_sym(s, field->ip, flags);
  677. if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
  678. trace_seq_puts(s, " <-");
  679. seq_print_ip_sym(s, field->parent_ip, flags);
  680. }
  681. trace_seq_putc(s, '\n');
  682. return trace_handle_return(s);
  683. }
  684. static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
  685. struct trace_event *event)
  686. {
  687. struct ftrace_entry *field;
  688. trace_assign_type(field, iter->ent);
  689. trace_seq_printf(&iter->seq, "%lx %lx\n",
  690. field->ip,
  691. field->parent_ip);
  692. return trace_handle_return(&iter->seq);
  693. }
  694. static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
  695. struct trace_event *event)
  696. {
  697. struct ftrace_entry *field;
  698. struct trace_seq *s = &iter->seq;
  699. trace_assign_type(field, iter->ent);
  700. SEQ_PUT_HEX_FIELD(s, field->ip);
  701. SEQ_PUT_HEX_FIELD(s, field->parent_ip);
  702. return trace_handle_return(s);
  703. }
  704. static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
  705. struct trace_event *event)
  706. {
  707. struct ftrace_entry *field;
  708. struct trace_seq *s = &iter->seq;
  709. trace_assign_type(field, iter->ent);
  710. SEQ_PUT_FIELD(s, field->ip);
  711. SEQ_PUT_FIELD(s, field->parent_ip);
  712. return trace_handle_return(s);
  713. }
  714. static struct trace_event_functions trace_fn_funcs = {
  715. .trace = trace_fn_trace,
  716. .raw = trace_fn_raw,
  717. .hex = trace_fn_hex,
  718. .binary = trace_fn_bin,
  719. };
  720. static struct trace_event trace_fn_event = {
  721. .type = TRACE_FN,
  722. .funcs = &trace_fn_funcs,
  723. };
  724. /* TRACE_CTX an TRACE_WAKE */
  725. static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
  726. char *delim)
  727. {
  728. struct ctx_switch_entry *field;
  729. char comm[TASK_COMM_LEN];
  730. int S, T;
  731. trace_assign_type(field, iter->ent);
  732. T = task_index_to_char(field->next_state);
  733. S = task_index_to_char(field->prev_state);
  734. trace_find_cmdline(field->next_pid, comm);
  735. trace_seq_printf(&iter->seq,
  736. " %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n",
  737. field->prev_pid,
  738. field->prev_prio,
  739. S, delim,
  740. field->next_cpu,
  741. field->next_pid,
  742. field->next_prio,
  743. T, comm);
  744. return trace_handle_return(&iter->seq);
  745. }
  746. static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
  747. struct trace_event *event)
  748. {
  749. return trace_ctxwake_print(iter, "==>");
  750. }
  751. static enum print_line_t trace_wake_print(struct trace_iterator *iter,
  752. int flags, struct trace_event *event)
  753. {
  754. return trace_ctxwake_print(iter, " +");
  755. }
  756. static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
  757. {
  758. struct ctx_switch_entry *field;
  759. int T;
  760. trace_assign_type(field, iter->ent);
  761. if (!S)
  762. S = task_index_to_char(field->prev_state);
  763. T = task_index_to_char(field->next_state);
  764. trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
  765. field->prev_pid,
  766. field->prev_prio,
  767. S,
  768. field->next_cpu,
  769. field->next_pid,
  770. field->next_prio,
  771. T);
  772. return trace_handle_return(&iter->seq);
  773. }
  774. static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
  775. struct trace_event *event)
  776. {
  777. return trace_ctxwake_raw(iter, 0);
  778. }
  779. static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
  780. struct trace_event *event)
  781. {
  782. return trace_ctxwake_raw(iter, '+');
  783. }
  784. static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
  785. {
  786. struct ctx_switch_entry *field;
  787. struct trace_seq *s = &iter->seq;
  788. int T;
  789. trace_assign_type(field, iter->ent);
  790. if (!S)
  791. S = task_index_to_char(field->prev_state);
  792. T = task_index_to_char(field->next_state);
  793. SEQ_PUT_HEX_FIELD(s, field->prev_pid);
  794. SEQ_PUT_HEX_FIELD(s, field->prev_prio);
  795. SEQ_PUT_HEX_FIELD(s, S);
  796. SEQ_PUT_HEX_FIELD(s, field->next_cpu);
  797. SEQ_PUT_HEX_FIELD(s, field->next_pid);
  798. SEQ_PUT_HEX_FIELD(s, field->next_prio);
  799. SEQ_PUT_HEX_FIELD(s, T);
  800. return trace_handle_return(s);
  801. }
  802. static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
  803. struct trace_event *event)
  804. {
  805. return trace_ctxwake_hex(iter, 0);
  806. }
  807. static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
  808. struct trace_event *event)
  809. {
  810. return trace_ctxwake_hex(iter, '+');
  811. }
  812. static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
  813. int flags, struct trace_event *event)
  814. {
  815. struct ctx_switch_entry *field;
  816. struct trace_seq *s = &iter->seq;
  817. trace_assign_type(field, iter->ent);
  818. SEQ_PUT_FIELD(s, field->prev_pid);
  819. SEQ_PUT_FIELD(s, field->prev_prio);
  820. SEQ_PUT_FIELD(s, field->prev_state);
  821. SEQ_PUT_FIELD(s, field->next_cpu);
  822. SEQ_PUT_FIELD(s, field->next_pid);
  823. SEQ_PUT_FIELD(s, field->next_prio);
  824. SEQ_PUT_FIELD(s, field->next_state);
  825. return trace_handle_return(s);
  826. }
  827. static struct trace_event_functions trace_ctx_funcs = {
  828. .trace = trace_ctx_print,
  829. .raw = trace_ctx_raw,
  830. .hex = trace_ctx_hex,
  831. .binary = trace_ctxwake_bin,
  832. };
  833. static struct trace_event trace_ctx_event = {
  834. .type = TRACE_CTX,
  835. .funcs = &trace_ctx_funcs,
  836. };
  837. static struct trace_event_functions trace_wake_funcs = {
  838. .trace = trace_wake_print,
  839. .raw = trace_wake_raw,
  840. .hex = trace_wake_hex,
  841. .binary = trace_ctxwake_bin,
  842. };
  843. static struct trace_event trace_wake_event = {
  844. .type = TRACE_WAKE,
  845. .funcs = &trace_wake_funcs,
  846. };
  847. /* TRACE_STACK */
  848. static enum print_line_t trace_stack_print(struct trace_iterator *iter,
  849. int flags, struct trace_event *event)
  850. {
  851. struct stack_entry *field;
  852. struct trace_seq *s = &iter->seq;
  853. unsigned long *p;
  854. unsigned long *end;
  855. trace_assign_type(field, iter->ent);
  856. end = (unsigned long *)((long)iter->ent + iter->ent_size);
  857. trace_seq_puts(s, "<stack trace>\n");
  858. for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) {
  859. if (trace_seq_has_overflowed(s))
  860. break;
  861. trace_seq_puts(s, " => ");
  862. seq_print_ip_sym(s, *p, flags);
  863. trace_seq_putc(s, '\n');
  864. }
  865. return trace_handle_return(s);
  866. }
  867. static struct trace_event_functions trace_stack_funcs = {
  868. .trace = trace_stack_print,
  869. };
  870. static struct trace_event trace_stack_event = {
  871. .type = TRACE_STACK,
  872. .funcs = &trace_stack_funcs,
  873. };
  874. /* TRACE_USER_STACK */
  875. static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
  876. int flags, struct trace_event *event)
  877. {
  878. struct trace_array *tr = iter->tr;
  879. struct userstack_entry *field;
  880. struct trace_seq *s = &iter->seq;
  881. struct mm_struct *mm = NULL;
  882. unsigned int i;
  883. trace_assign_type(field, iter->ent);
  884. trace_seq_puts(s, "<user stack trace>\n");
  885. if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
  886. struct task_struct *task;
  887. /*
  888. * we do the lookup on the thread group leader,
  889. * since individual threads might have already quit!
  890. */
  891. rcu_read_lock();
  892. task = find_task_by_vpid(field->tgid);
  893. if (task)
  894. mm = get_task_mm(task);
  895. rcu_read_unlock();
  896. }
  897. for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
  898. unsigned long ip = field->caller[i];
  899. if (!ip || trace_seq_has_overflowed(s))
  900. break;
  901. trace_seq_puts(s, " => ");
  902. seq_print_user_ip(s, mm, ip, flags);
  903. trace_seq_putc(s, '\n');
  904. }
  905. if (mm)
  906. mmput(mm);
  907. return trace_handle_return(s);
  908. }
  909. static struct trace_event_functions trace_user_stack_funcs = {
  910. .trace = trace_user_stack_print,
  911. };
  912. static struct trace_event trace_user_stack_event = {
  913. .type = TRACE_USER_STACK,
  914. .funcs = &trace_user_stack_funcs,
  915. };
  916. /* TRACE_HWLAT */
  917. static enum print_line_t
  918. trace_hwlat_print(struct trace_iterator *iter, int flags,
  919. struct trace_event *event)
  920. {
  921. struct trace_entry *entry = iter->ent;
  922. struct trace_seq *s = &iter->seq;
  923. struct hwlat_entry *field;
  924. trace_assign_type(field, entry);
  925. trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d",
  926. field->seqnum,
  927. field->duration,
  928. field->outer_duration,
  929. (long long)field->timestamp.tv_sec,
  930. field->timestamp.tv_nsec, field->count);
  931. if (field->nmi_count) {
  932. /*
  933. * The generic sched_clock() is not NMI safe, thus
  934. * we only record the count and not the time.
  935. */
  936. if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
  937. trace_seq_printf(s, " nmi-total:%llu",
  938. field->nmi_total_ts);
  939. trace_seq_printf(s, " nmi-count:%u",
  940. field->nmi_count);
  941. }
  942. trace_seq_putc(s, '\n');
  943. return trace_handle_return(s);
  944. }
  945. static enum print_line_t
  946. trace_hwlat_raw(struct trace_iterator *iter, int flags,
  947. struct trace_event *event)
  948. {
  949. struct hwlat_entry *field;
  950. struct trace_seq *s = &iter->seq;
  951. trace_assign_type(field, iter->ent);
  952. trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
  953. field->duration,
  954. field->outer_duration,
  955. (long long)field->timestamp.tv_sec,
  956. field->timestamp.tv_nsec,
  957. field->seqnum);
  958. return trace_handle_return(s);
  959. }
  960. static struct trace_event_functions trace_hwlat_funcs = {
  961. .trace = trace_hwlat_print,
  962. .raw = trace_hwlat_raw,
  963. };
  964. static struct trace_event trace_hwlat_event = {
  965. .type = TRACE_HWLAT,
  966. .funcs = &trace_hwlat_funcs,
  967. };
  968. /* TRACE_BPUTS */
  969. static enum print_line_t
  970. trace_bputs_print(struct trace_iterator *iter, int flags,
  971. struct trace_event *event)
  972. {
  973. struct trace_entry *entry = iter->ent;
  974. struct trace_seq *s = &iter->seq;
  975. struct bputs_entry *field;
  976. trace_assign_type(field, entry);
  977. seq_print_ip_sym(s, field->ip, flags);
  978. trace_seq_puts(s, ": ");
  979. trace_seq_puts(s, field->str);
  980. return trace_handle_return(s);
  981. }
  982. static enum print_line_t
  983. trace_bputs_raw(struct trace_iterator *iter, int flags,
  984. struct trace_event *event)
  985. {
  986. struct bputs_entry *field;
  987. struct trace_seq *s = &iter->seq;
  988. trace_assign_type(field, iter->ent);
  989. trace_seq_printf(s, ": %lx : ", field->ip);
  990. trace_seq_puts(s, field->str);
  991. return trace_handle_return(s);
  992. }
  993. static struct trace_event_functions trace_bputs_funcs = {
  994. .trace = trace_bputs_print,
  995. .raw = trace_bputs_raw,
  996. };
  997. static struct trace_event trace_bputs_event = {
  998. .type = TRACE_BPUTS,
  999. .funcs = &trace_bputs_funcs,
  1000. };
  1001. /* TRACE_BPRINT */
  1002. static enum print_line_t
  1003. trace_bprint_print(struct trace_iterator *iter, int flags,
  1004. struct trace_event *event)
  1005. {
  1006. struct trace_entry *entry = iter->ent;
  1007. struct trace_seq *s = &iter->seq;
  1008. struct bprint_entry *field;
  1009. trace_assign_type(field, entry);
  1010. seq_print_ip_sym(s, field->ip, flags);
  1011. trace_seq_puts(s, ": ");
  1012. trace_seq_bprintf(s, field->fmt, field->buf);
  1013. return trace_handle_return(s);
  1014. }
  1015. static enum print_line_t
  1016. trace_bprint_raw(struct trace_iterator *iter, int flags,
  1017. struct trace_event *event)
  1018. {
  1019. struct bprint_entry *field;
  1020. struct trace_seq *s = &iter->seq;
  1021. trace_assign_type(field, iter->ent);
  1022. trace_seq_printf(s, ": %lx : ", field->ip);
  1023. trace_seq_bprintf(s, field->fmt, field->buf);
  1024. return trace_handle_return(s);
  1025. }
  1026. static struct trace_event_functions trace_bprint_funcs = {
  1027. .trace = trace_bprint_print,
  1028. .raw = trace_bprint_raw,
  1029. };
  1030. static struct trace_event trace_bprint_event = {
  1031. .type = TRACE_BPRINT,
  1032. .funcs = &trace_bprint_funcs,
  1033. };
  1034. /* TRACE_PRINT */
  1035. static enum print_line_t trace_print_print(struct trace_iterator *iter,
  1036. int flags, struct trace_event *event)
  1037. {
  1038. struct print_entry *field;
  1039. struct trace_seq *s = &iter->seq;
  1040. trace_assign_type(field, iter->ent);
  1041. seq_print_ip_sym(s, field->ip, flags);
  1042. trace_seq_printf(s, ": %s", field->buf);
  1043. return trace_handle_return(s);
  1044. }
  1045. static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
  1046. struct trace_event *event)
  1047. {
  1048. struct print_entry *field;
  1049. trace_assign_type(field, iter->ent);
  1050. trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
  1051. return trace_handle_return(&iter->seq);
  1052. }
  1053. static struct trace_event_functions trace_print_funcs = {
  1054. .trace = trace_print_print,
  1055. .raw = trace_print_raw,
  1056. };
  1057. static struct trace_event trace_print_event = {
  1058. .type = TRACE_PRINT,
  1059. .funcs = &trace_print_funcs,
  1060. };
  1061. static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
  1062. struct trace_event *event)
  1063. {
  1064. struct raw_data_entry *field;
  1065. int i;
  1066. trace_assign_type(field, iter->ent);
  1067. trace_seq_printf(&iter->seq, "# %x buf:", field->id);
  1068. for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
  1069. trace_seq_printf(&iter->seq, " %02x",
  1070. (unsigned char)field->buf[i]);
  1071. trace_seq_putc(&iter->seq, '\n');
  1072. return trace_handle_return(&iter->seq);
  1073. }
  1074. static struct trace_event_functions trace_raw_data_funcs = {
  1075. .trace = trace_raw_data,
  1076. .raw = trace_raw_data,
  1077. };
  1078. static struct trace_event trace_raw_data_event = {
  1079. .type = TRACE_RAW_DATA,
  1080. .funcs = &trace_raw_data_funcs,
  1081. };
  1082. static struct trace_event *events[] __initdata = {
  1083. &trace_fn_event,
  1084. &trace_ctx_event,
  1085. &trace_wake_event,
  1086. &trace_stack_event,
  1087. &trace_user_stack_event,
  1088. &trace_bputs_event,
  1089. &trace_bprint_event,
  1090. &trace_print_event,
  1091. &trace_hwlat_event,
  1092. &trace_raw_data_event,
  1093. NULL
  1094. };
  1095. __init static int init_events(void)
  1096. {
  1097. struct trace_event *event;
  1098. int i, ret;
  1099. for (i = 0; events[i]; i++) {
  1100. event = events[i];
  1101. ret = register_trace_event(event);
  1102. if (!ret) {
  1103. printk(KERN_WARNING "event %d failed to register\n",
  1104. event->type);
  1105. WARN_ON_ONCE(1);
  1106. }
  1107. }
  1108. return 0;
  1109. }
  1110. early_initcall(init_events);