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Merge branch 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / tools / perf / util / header.c
1 #define _FILE_OFFSET_BITS 64
2
3 #include "util.h"
4 #include <sys/types.h>
5 #include <byteswap.h>
6 #include <unistd.h>
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <linux/list.h>
10 #include <linux/kernel.h>
11 #include <linux/bitops.h>
12 #include <sys/utsname.h>
13
14 #include "evlist.h"
15 #include "evsel.h"
16 #include "header.h"
17 #include "../perf.h"
18 #include "trace-event.h"
19 #include "session.h"
20 #include "symbol.h"
21 #include "debug.h"
22 #include "cpumap.h"
23
24 static bool no_buildid_cache = false;
25
26 static int event_count;
27 static struct perf_trace_event_type *events;
28
29 static u32 header_argc;
30 static const char **header_argv;
31
32 int perf_header__push_event(u64 id, const char *name)
33 {
34 struct perf_trace_event_type *nevents;
35
36 if (strlen(name) > MAX_EVENT_NAME)
37 pr_warning("Event %s will be truncated\n", name);
38
39 nevents = realloc(events, (event_count + 1) * sizeof(*events));
40 if (nevents == NULL)
41 return -ENOMEM;
42 events = nevents;
43
44 memset(&events[event_count], 0, sizeof(struct perf_trace_event_type));
45 events[event_count].event_id = id;
46 strncpy(events[event_count].name, name, MAX_EVENT_NAME - 1);
47 event_count++;
48 return 0;
49 }
50
51 char *perf_header__find_event(u64 id)
52 {
53 int i;
54 for (i = 0 ; i < event_count; i++) {
55 if (events[i].event_id == id)
56 return events[i].name;
57 }
58 return NULL;
59 }
60
61 /*
62 * magic2 = "PERFILE2"
63 * must be a numerical value to let the endianness
64 * determine the memory layout. That way we are able
65 * to detect endianness when reading the perf.data file
66 * back.
67 *
68 * we check for legacy (PERFFILE) format.
69 */
70 static const char *__perf_magic1 = "PERFFILE";
71 static const u64 __perf_magic2 = 0x32454c4946524550ULL;
72 static const u64 __perf_magic2_sw = 0x50455246494c4532ULL;
73
74 #define PERF_MAGIC __perf_magic2
75
76 struct perf_file_attr {
77 struct perf_event_attr attr;
78 struct perf_file_section ids;
79 };
80
81 void perf_header__set_feat(struct perf_header *header, int feat)
82 {
83 set_bit(feat, header->adds_features);
84 }
85
86 void perf_header__clear_feat(struct perf_header *header, int feat)
87 {
88 clear_bit(feat, header->adds_features);
89 }
90
91 bool perf_header__has_feat(const struct perf_header *header, int feat)
92 {
93 return test_bit(feat, header->adds_features);
94 }
95
96 static int do_write(int fd, const void *buf, size_t size)
97 {
98 while (size) {
99 int ret = write(fd, buf, size);
100
101 if (ret < 0)
102 return -errno;
103
104 size -= ret;
105 buf += ret;
106 }
107
108 return 0;
109 }
110
111 #define NAME_ALIGN 64
112
113 static int write_padded(int fd, const void *bf, size_t count,
114 size_t count_aligned)
115 {
116 static const char zero_buf[NAME_ALIGN];
117 int err = do_write(fd, bf, count);
118
119 if (!err)
120 err = do_write(fd, zero_buf, count_aligned - count);
121
122 return err;
123 }
124
125 static int do_write_string(int fd, const char *str)
126 {
127 u32 len, olen;
128 int ret;
129
130 olen = strlen(str) + 1;
131 len = ALIGN(olen, NAME_ALIGN);
132
133 /* write len, incl. \0 */
134 ret = do_write(fd, &len, sizeof(len));
135 if (ret < 0)
136 return ret;
137
138 return write_padded(fd, str, olen, len);
139 }
140
141 static char *do_read_string(int fd, struct perf_header *ph)
142 {
143 ssize_t sz, ret;
144 u32 len;
145 char *buf;
146
147 sz = read(fd, &len, sizeof(len));
148 if (sz < (ssize_t)sizeof(len))
149 return NULL;
150
151 if (ph->needs_swap)
152 len = bswap_32(len);
153
154 buf = malloc(len);
155 if (!buf)
156 return NULL;
157
158 ret = read(fd, buf, len);
159 if (ret == (ssize_t)len) {
160 /*
161 * strings are padded by zeroes
162 * thus the actual strlen of buf
163 * may be less than len
164 */
165 return buf;
166 }
167
168 free(buf);
169 return NULL;
170 }
171
172 int
173 perf_header__set_cmdline(int argc, const char **argv)
174 {
175 int i;
176
177 header_argc = (u32)argc;
178
179 /* do not include NULL termination */
180 header_argv = calloc(argc, sizeof(char *));
181 if (!header_argv)
182 return -ENOMEM;
183
184 /*
185 * must copy argv contents because it gets moved
186 * around during option parsing
187 */
188 for (i = 0; i < argc ; i++)
189 header_argv[i] = argv[i];
190
191 return 0;
192 }
193
194 #define dsos__for_each_with_build_id(pos, head) \
195 list_for_each_entry(pos, head, node) \
196 if (!pos->has_build_id) \
197 continue; \
198 else
199
200 static int __dsos__write_buildid_table(struct list_head *head, pid_t pid,
201 u16 misc, int fd)
202 {
203 struct dso *pos;
204
205 dsos__for_each_with_build_id(pos, head) {
206 int err;
207 struct build_id_event b;
208 size_t len;
209
210 if (!pos->hit)
211 continue;
212 len = pos->long_name_len + 1;
213 len = ALIGN(len, NAME_ALIGN);
214 memset(&b, 0, sizeof(b));
215 memcpy(&b.build_id, pos->build_id, sizeof(pos->build_id));
216 b.pid = pid;
217 b.header.misc = misc;
218 b.header.size = sizeof(b) + len;
219 err = do_write(fd, &b, sizeof(b));
220 if (err < 0)
221 return err;
222 err = write_padded(fd, pos->long_name,
223 pos->long_name_len + 1, len);
224 if (err < 0)
225 return err;
226 }
227
228 return 0;
229 }
230
231 static int machine__write_buildid_table(struct machine *machine, int fd)
232 {
233 int err;
234 u16 kmisc = PERF_RECORD_MISC_KERNEL,
235 umisc = PERF_RECORD_MISC_USER;
236
237 if (!machine__is_host(machine)) {
238 kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
239 umisc = PERF_RECORD_MISC_GUEST_USER;
240 }
241
242 err = __dsos__write_buildid_table(&machine->kernel_dsos, machine->pid,
243 kmisc, fd);
244 if (err == 0)
245 err = __dsos__write_buildid_table(&machine->user_dsos,
246 machine->pid, umisc, fd);
247 return err;
248 }
249
250 static int dsos__write_buildid_table(struct perf_header *header, int fd)
251 {
252 struct perf_session *session = container_of(header,
253 struct perf_session, header);
254 struct rb_node *nd;
255 int err = machine__write_buildid_table(&session->host_machine, fd);
256
257 if (err)
258 return err;
259
260 for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
261 struct machine *pos = rb_entry(nd, struct machine, rb_node);
262 err = machine__write_buildid_table(pos, fd);
263 if (err)
264 break;
265 }
266 return err;
267 }
268
269 int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
270 const char *name, bool is_kallsyms)
271 {
272 const size_t size = PATH_MAX;
273 char *realname, *filename = zalloc(size),
274 *linkname = zalloc(size), *targetname;
275 int len, err = -1;
276
277 if (is_kallsyms) {
278 if (symbol_conf.kptr_restrict) {
279 pr_debug("Not caching a kptr_restrict'ed /proc/kallsyms\n");
280 return 0;
281 }
282 realname = (char *)name;
283 } else
284 realname = realpath(name, NULL);
285
286 if (realname == NULL || filename == NULL || linkname == NULL)
287 goto out_free;
288
289 len = scnprintf(filename, size, "%s%s%s",
290 debugdir, is_kallsyms ? "/" : "", realname);
291 if (mkdir_p(filename, 0755))
292 goto out_free;
293
294 snprintf(filename + len, size - len, "/%s", sbuild_id);
295
296 if (access(filename, F_OK)) {
297 if (is_kallsyms) {
298 if (copyfile("/proc/kallsyms", filename))
299 goto out_free;
300 } else if (link(realname, filename) && copyfile(name, filename))
301 goto out_free;
302 }
303
304 len = scnprintf(linkname, size, "%s/.build-id/%.2s",
305 debugdir, sbuild_id);
306
307 if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
308 goto out_free;
309
310 snprintf(linkname + len, size - len, "/%s", sbuild_id + 2);
311 targetname = filename + strlen(debugdir) - 5;
312 memcpy(targetname, "../..", 5);
313
314 if (symlink(targetname, linkname) == 0)
315 err = 0;
316 out_free:
317 if (!is_kallsyms)
318 free(realname);
319 free(filename);
320 free(linkname);
321 return err;
322 }
323
324 static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
325 const char *name, const char *debugdir,
326 bool is_kallsyms)
327 {
328 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
329
330 build_id__sprintf(build_id, build_id_size, sbuild_id);
331
332 return build_id_cache__add_s(sbuild_id, debugdir, name, is_kallsyms);
333 }
334
335 int build_id_cache__remove_s(const char *sbuild_id, const char *debugdir)
336 {
337 const size_t size = PATH_MAX;
338 char *filename = zalloc(size),
339 *linkname = zalloc(size);
340 int err = -1;
341
342 if (filename == NULL || linkname == NULL)
343 goto out_free;
344
345 snprintf(linkname, size, "%s/.build-id/%.2s/%s",
346 debugdir, sbuild_id, sbuild_id + 2);
347
348 if (access(linkname, F_OK))
349 goto out_free;
350
351 if (readlink(linkname, filename, size - 1) < 0)
352 goto out_free;
353
354 if (unlink(linkname))
355 goto out_free;
356
357 /*
358 * Since the link is relative, we must make it absolute:
359 */
360 snprintf(linkname, size, "%s/.build-id/%.2s/%s",
361 debugdir, sbuild_id, filename);
362
363 if (unlink(linkname))
364 goto out_free;
365
366 err = 0;
367 out_free:
368 free(filename);
369 free(linkname);
370 return err;
371 }
372
373 static int dso__cache_build_id(struct dso *dso, const char *debugdir)
374 {
375 bool is_kallsyms = dso->kernel && dso->long_name[0] != '/';
376
377 return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id),
378 dso->long_name, debugdir, is_kallsyms);
379 }
380
381 static int __dsos__cache_build_ids(struct list_head *head, const char *debugdir)
382 {
383 struct dso *pos;
384 int err = 0;
385
386 dsos__for_each_with_build_id(pos, head)
387 if (dso__cache_build_id(pos, debugdir))
388 err = -1;
389
390 return err;
391 }
392
393 static int machine__cache_build_ids(struct machine *machine, const char *debugdir)
394 {
395 int ret = __dsos__cache_build_ids(&machine->kernel_dsos, debugdir);
396 ret |= __dsos__cache_build_ids(&machine->user_dsos, debugdir);
397 return ret;
398 }
399
400 static int perf_session__cache_build_ids(struct perf_session *session)
401 {
402 struct rb_node *nd;
403 int ret;
404 char debugdir[PATH_MAX];
405
406 snprintf(debugdir, sizeof(debugdir), "%s", buildid_dir);
407
408 if (mkdir(debugdir, 0755) != 0 && errno != EEXIST)
409 return -1;
410
411 ret = machine__cache_build_ids(&session->host_machine, debugdir);
412
413 for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
414 struct machine *pos = rb_entry(nd, struct machine, rb_node);
415 ret |= machine__cache_build_ids(pos, debugdir);
416 }
417 return ret ? -1 : 0;
418 }
419
420 static bool machine__read_build_ids(struct machine *machine, bool with_hits)
421 {
422 bool ret = __dsos__read_build_ids(&machine->kernel_dsos, with_hits);
423 ret |= __dsos__read_build_ids(&machine->user_dsos, with_hits);
424 return ret;
425 }
426
427 static bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
428 {
429 struct rb_node *nd;
430 bool ret = machine__read_build_ids(&session->host_machine, with_hits);
431
432 for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
433 struct machine *pos = rb_entry(nd, struct machine, rb_node);
434 ret |= machine__read_build_ids(pos, with_hits);
435 }
436
437 return ret;
438 }
439
440 static int write_tracing_data(int fd, struct perf_header *h __used,
441 struct perf_evlist *evlist)
442 {
443 return read_tracing_data(fd, &evlist->entries);
444 }
445
446
447 static int write_build_id(int fd, struct perf_header *h,
448 struct perf_evlist *evlist __used)
449 {
450 struct perf_session *session;
451 int err;
452
453 session = container_of(h, struct perf_session, header);
454
455 if (!perf_session__read_build_ids(session, true))
456 return -1;
457
458 err = dsos__write_buildid_table(h, fd);
459 if (err < 0) {
460 pr_debug("failed to write buildid table\n");
461 return err;
462 }
463 if (!no_buildid_cache)
464 perf_session__cache_build_ids(session);
465
466 return 0;
467 }
468
469 static int write_hostname(int fd, struct perf_header *h __used,
470 struct perf_evlist *evlist __used)
471 {
472 struct utsname uts;
473 int ret;
474
475 ret = uname(&uts);
476 if (ret < 0)
477 return -1;
478
479 return do_write_string(fd, uts.nodename);
480 }
481
482 static int write_osrelease(int fd, struct perf_header *h __used,
483 struct perf_evlist *evlist __used)
484 {
485 struct utsname uts;
486 int ret;
487
488 ret = uname(&uts);
489 if (ret < 0)
490 return -1;
491
492 return do_write_string(fd, uts.release);
493 }
494
495 static int write_arch(int fd, struct perf_header *h __used,
496 struct perf_evlist *evlist __used)
497 {
498 struct utsname uts;
499 int ret;
500
501 ret = uname(&uts);
502 if (ret < 0)
503 return -1;
504
505 return do_write_string(fd, uts.machine);
506 }
507
508 static int write_version(int fd, struct perf_header *h __used,
509 struct perf_evlist *evlist __used)
510 {
511 return do_write_string(fd, perf_version_string);
512 }
513
514 static int write_cpudesc(int fd, struct perf_header *h __used,
515 struct perf_evlist *evlist __used)
516 {
517 #ifndef CPUINFO_PROC
518 #define CPUINFO_PROC NULL
519 #endif
520 FILE *file;
521 char *buf = NULL;
522 char *s, *p;
523 const char *search = CPUINFO_PROC;
524 size_t len = 0;
525 int ret = -1;
526
527 if (!search)
528 return -1;
529
530 file = fopen("/proc/cpuinfo", "r");
531 if (!file)
532 return -1;
533
534 while (getline(&buf, &len, file) > 0) {
535 ret = strncmp(buf, search, strlen(search));
536 if (!ret)
537 break;
538 }
539
540 if (ret)
541 goto done;
542
543 s = buf;
544
545 p = strchr(buf, ':');
546 if (p && *(p+1) == ' ' && *(p+2))
547 s = p + 2;
548 p = strchr(s, '\n');
549 if (p)
550 *p = '\0';
551
552 /* squash extra space characters (branding string) */
553 p = s;
554 while (*p) {
555 if (isspace(*p)) {
556 char *r = p + 1;
557 char *q = r;
558 *p = ' ';
559 while (*q && isspace(*q))
560 q++;
561 if (q != (p+1))
562 while ((*r++ = *q++));
563 }
564 p++;
565 }
566 ret = do_write_string(fd, s);
567 done:
568 free(buf);
569 fclose(file);
570 return ret;
571 }
572
573 static int write_nrcpus(int fd, struct perf_header *h __used,
574 struct perf_evlist *evlist __used)
575 {
576 long nr;
577 u32 nrc, nra;
578 int ret;
579
580 nr = sysconf(_SC_NPROCESSORS_CONF);
581 if (nr < 0)
582 return -1;
583
584 nrc = (u32)(nr & UINT_MAX);
585
586 nr = sysconf(_SC_NPROCESSORS_ONLN);
587 if (nr < 0)
588 return -1;
589
590 nra = (u32)(nr & UINT_MAX);
591
592 ret = do_write(fd, &nrc, sizeof(nrc));
593 if (ret < 0)
594 return ret;
595
596 return do_write(fd, &nra, sizeof(nra));
597 }
598
599 static int write_event_desc(int fd, struct perf_header *h __used,
600 struct perf_evlist *evlist)
601 {
602 struct perf_evsel *attr;
603 u32 nre = 0, nri, sz;
604 int ret;
605
606 list_for_each_entry(attr, &evlist->entries, node)
607 nre++;
608
609 /*
610 * write number of events
611 */
612 ret = do_write(fd, &nre, sizeof(nre));
613 if (ret < 0)
614 return ret;
615
616 /*
617 * size of perf_event_attr struct
618 */
619 sz = (u32)sizeof(attr->attr);
620 ret = do_write(fd, &sz, sizeof(sz));
621 if (ret < 0)
622 return ret;
623
624 list_for_each_entry(attr, &evlist->entries, node) {
625
626 ret = do_write(fd, &attr->attr, sz);
627 if (ret < 0)
628 return ret;
629 /*
630 * write number of unique id per event
631 * there is one id per instance of an event
632 *
633 * copy into an nri to be independent of the
634 * type of ids,
635 */
636 nri = attr->ids;
637 ret = do_write(fd, &nri, sizeof(nri));
638 if (ret < 0)
639 return ret;
640
641 /*
642 * write event string as passed on cmdline
643 */
644 ret = do_write_string(fd, perf_evsel__name(attr));
645 if (ret < 0)
646 return ret;
647 /*
648 * write unique ids for this event
649 */
650 ret = do_write(fd, attr->id, attr->ids * sizeof(u64));
651 if (ret < 0)
652 return ret;
653 }
654 return 0;
655 }
656
657 static int write_cmdline(int fd, struct perf_header *h __used,
658 struct perf_evlist *evlist __used)
659 {
660 char buf[MAXPATHLEN];
661 char proc[32];
662 u32 i, n;
663 int ret;
664
665 /*
666 * actual atual path to perf binary
667 */
668 sprintf(proc, "/proc/%d/exe", getpid());
669 ret = readlink(proc, buf, sizeof(buf));
670 if (ret <= 0)
671 return -1;
672
673 /* readlink() does not add null termination */
674 buf[ret] = '\0';
675
676 /* account for binary path */
677 n = header_argc + 1;
678
679 ret = do_write(fd, &n, sizeof(n));
680 if (ret < 0)
681 return ret;
682
683 ret = do_write_string(fd, buf);
684 if (ret < 0)
685 return ret;
686
687 for (i = 0 ; i < header_argc; i++) {
688 ret = do_write_string(fd, header_argv[i]);
689 if (ret < 0)
690 return ret;
691 }
692 return 0;
693 }
694
695 #define CORE_SIB_FMT \
696 "/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
697 #define THRD_SIB_FMT \
698 "/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
699
700 struct cpu_topo {
701 u32 core_sib;
702 u32 thread_sib;
703 char **core_siblings;
704 char **thread_siblings;
705 };
706
707 static int build_cpu_topo(struct cpu_topo *tp, int cpu)
708 {
709 FILE *fp;
710 char filename[MAXPATHLEN];
711 char *buf = NULL, *p;
712 size_t len = 0;
713 u32 i = 0;
714 int ret = -1;
715
716 sprintf(filename, CORE_SIB_FMT, cpu);
717 fp = fopen(filename, "r");
718 if (!fp)
719 return -1;
720
721 if (getline(&buf, &len, fp) <= 0)
722 goto done;
723
724 fclose(fp);
725
726 p = strchr(buf, '\n');
727 if (p)
728 *p = '\0';
729
730 for (i = 0; i < tp->core_sib; i++) {
731 if (!strcmp(buf, tp->core_siblings[i]))
732 break;
733 }
734 if (i == tp->core_sib) {
735 tp->core_siblings[i] = buf;
736 tp->core_sib++;
737 buf = NULL;
738 len = 0;
739 }
740
741 sprintf(filename, THRD_SIB_FMT, cpu);
742 fp = fopen(filename, "r");
743 if (!fp)
744 goto done;
745
746 if (getline(&buf, &len, fp) <= 0)
747 goto done;
748
749 p = strchr(buf, '\n');
750 if (p)
751 *p = '\0';
752
753 for (i = 0; i < tp->thread_sib; i++) {
754 if (!strcmp(buf, tp->thread_siblings[i]))
755 break;
756 }
757 if (i == tp->thread_sib) {
758 tp->thread_siblings[i] = buf;
759 tp->thread_sib++;
760 buf = NULL;
761 }
762 ret = 0;
763 done:
764 if(fp)
765 fclose(fp);
766 free(buf);
767 return ret;
768 }
769
770 static void free_cpu_topo(struct cpu_topo *tp)
771 {
772 u32 i;
773
774 if (!tp)
775 return;
776
777 for (i = 0 ; i < tp->core_sib; i++)
778 free(tp->core_siblings[i]);
779
780 for (i = 0 ; i < tp->thread_sib; i++)
781 free(tp->thread_siblings[i]);
782
783 free(tp);
784 }
785
786 static struct cpu_topo *build_cpu_topology(void)
787 {
788 struct cpu_topo *tp;
789 void *addr;
790 u32 nr, i;
791 size_t sz;
792 long ncpus;
793 int ret = -1;
794
795 ncpus = sysconf(_SC_NPROCESSORS_CONF);
796 if (ncpus < 0)
797 return NULL;
798
799 nr = (u32)(ncpus & UINT_MAX);
800
801 sz = nr * sizeof(char *);
802
803 addr = calloc(1, sizeof(*tp) + 2 * sz);
804 if (!addr)
805 return NULL;
806
807 tp = addr;
808
809 addr += sizeof(*tp);
810 tp->core_siblings = addr;
811 addr += sz;
812 tp->thread_siblings = addr;
813
814 for (i = 0; i < nr; i++) {
815 ret = build_cpu_topo(tp, i);
816 if (ret < 0)
817 break;
818 }
819 if (ret) {
820 free_cpu_topo(tp);
821 tp = NULL;
822 }
823 return tp;
824 }
825
826 static int write_cpu_topology(int fd, struct perf_header *h __used,
827 struct perf_evlist *evlist __used)
828 {
829 struct cpu_topo *tp;
830 u32 i;
831 int ret;
832
833 tp = build_cpu_topology();
834 if (!tp)
835 return -1;
836
837 ret = do_write(fd, &tp->core_sib, sizeof(tp->core_sib));
838 if (ret < 0)
839 goto done;
840
841 for (i = 0; i < tp->core_sib; i++) {
842 ret = do_write_string(fd, tp->core_siblings[i]);
843 if (ret < 0)
844 goto done;
845 }
846 ret = do_write(fd, &tp->thread_sib, sizeof(tp->thread_sib));
847 if (ret < 0)
848 goto done;
849
850 for (i = 0; i < tp->thread_sib; i++) {
851 ret = do_write_string(fd, tp->thread_siblings[i]);
852 if (ret < 0)
853 break;
854 }
855 done:
856 free_cpu_topo(tp);
857 return ret;
858 }
859
860
861
862 static int write_total_mem(int fd, struct perf_header *h __used,
863 struct perf_evlist *evlist __used)
864 {
865 char *buf = NULL;
866 FILE *fp;
867 size_t len = 0;
868 int ret = -1, n;
869 uint64_t mem;
870
871 fp = fopen("/proc/meminfo", "r");
872 if (!fp)
873 return -1;
874
875 while (getline(&buf, &len, fp) > 0) {
876 ret = strncmp(buf, "MemTotal:", 9);
877 if (!ret)
878 break;
879 }
880 if (!ret) {
881 n = sscanf(buf, "%*s %"PRIu64, &mem);
882 if (n == 1)
883 ret = do_write(fd, &mem, sizeof(mem));
884 }
885 free(buf);
886 fclose(fp);
887 return ret;
888 }
889
890 static int write_topo_node(int fd, int node)
891 {
892 char str[MAXPATHLEN];
893 char field[32];
894 char *buf = NULL, *p;
895 size_t len = 0;
896 FILE *fp;
897 u64 mem_total, mem_free, mem;
898 int ret = -1;
899
900 sprintf(str, "/sys/devices/system/node/node%d/meminfo", node);
901 fp = fopen(str, "r");
902 if (!fp)
903 return -1;
904
905 while (getline(&buf, &len, fp) > 0) {
906 /* skip over invalid lines */
907 if (!strchr(buf, ':'))
908 continue;
909 if (sscanf(buf, "%*s %*d %s %"PRIu64, field, &mem) != 2)
910 goto done;
911 if (!strcmp(field, "MemTotal:"))
912 mem_total = mem;
913 if (!strcmp(field, "MemFree:"))
914 mem_free = mem;
915 }
916
917 fclose(fp);
918
919 ret = do_write(fd, &mem_total, sizeof(u64));
920 if (ret)
921 goto done;
922
923 ret = do_write(fd, &mem_free, sizeof(u64));
924 if (ret)
925 goto done;
926
927 ret = -1;
928 sprintf(str, "/sys/devices/system/node/node%d/cpulist", node);
929
930 fp = fopen(str, "r");
931 if (!fp)
932 goto done;
933
934 if (getline(&buf, &len, fp) <= 0)
935 goto done;
936
937 p = strchr(buf, '\n');
938 if (p)
939 *p = '\0';
940
941 ret = do_write_string(fd, buf);
942 done:
943 free(buf);
944 fclose(fp);
945 return ret;
946 }
947
948 static int write_numa_topology(int fd, struct perf_header *h __used,
949 struct perf_evlist *evlist __used)
950 {
951 char *buf = NULL;
952 size_t len = 0;
953 FILE *fp;
954 struct cpu_map *node_map = NULL;
955 char *c;
956 u32 nr, i, j;
957 int ret = -1;
958
959 fp = fopen("/sys/devices/system/node/online", "r");
960 if (!fp)
961 return -1;
962
963 if (getline(&buf, &len, fp) <= 0)
964 goto done;
965
966 c = strchr(buf, '\n');
967 if (c)
968 *c = '\0';
969
970 node_map = cpu_map__new(buf);
971 if (!node_map)
972 goto done;
973
974 nr = (u32)node_map->nr;
975
976 ret = do_write(fd, &nr, sizeof(nr));
977 if (ret < 0)
978 goto done;
979
980 for (i = 0; i < nr; i++) {
981 j = (u32)node_map->map[i];
982 ret = do_write(fd, &j, sizeof(j));
983 if (ret < 0)
984 break;
985
986 ret = write_topo_node(fd, i);
987 if (ret < 0)
988 break;
989 }
990 done:
991 free(buf);
992 fclose(fp);
993 free(node_map);
994 return ret;
995 }
996
997 /*
998 * default get_cpuid(): nothing gets recorded
999 * actual implementation must be in arch/$(ARCH)/util/header.c
1000 */
1001 int __attribute__((weak)) get_cpuid(char *buffer __used, size_t sz __used)
1002 {
1003 return -1;
1004 }
1005
1006 static int write_cpuid(int fd, struct perf_header *h __used,
1007 struct perf_evlist *evlist __used)
1008 {
1009 char buffer[64];
1010 int ret;
1011
1012 ret = get_cpuid(buffer, sizeof(buffer));
1013 if (!ret)
1014 goto write_it;
1015
1016 return -1;
1017 write_it:
1018 return do_write_string(fd, buffer);
1019 }
1020
1021 static int write_branch_stack(int fd __used, struct perf_header *h __used,
1022 struct perf_evlist *evlist __used)
1023 {
1024 return 0;
1025 }
1026
1027 static void print_hostname(struct perf_header *ph, int fd, FILE *fp)
1028 {
1029 char *str = do_read_string(fd, ph);
1030 fprintf(fp, "# hostname : %s\n", str);
1031 free(str);
1032 }
1033
1034 static void print_osrelease(struct perf_header *ph, int fd, FILE *fp)
1035 {
1036 char *str = do_read_string(fd, ph);
1037 fprintf(fp, "# os release : %s\n", str);
1038 free(str);
1039 }
1040
1041 static void print_arch(struct perf_header *ph, int fd, FILE *fp)
1042 {
1043 char *str = do_read_string(fd, ph);
1044 fprintf(fp, "# arch : %s\n", str);
1045 free(str);
1046 }
1047
1048 static void print_cpudesc(struct perf_header *ph, int fd, FILE *fp)
1049 {
1050 char *str = do_read_string(fd, ph);
1051 fprintf(fp, "# cpudesc : %s\n", str);
1052 free(str);
1053 }
1054
1055 static void print_nrcpus(struct perf_header *ph, int fd, FILE *fp)
1056 {
1057 ssize_t ret;
1058 u32 nr;
1059
1060 ret = read(fd, &nr, sizeof(nr));
1061 if (ret != (ssize_t)sizeof(nr))
1062 nr = -1; /* interpreted as error */
1063
1064 if (ph->needs_swap)
1065 nr = bswap_32(nr);
1066
1067 fprintf(fp, "# nrcpus online : %u\n", nr);
1068
1069 ret = read(fd, &nr, sizeof(nr));
1070 if (ret != (ssize_t)sizeof(nr))
1071 nr = -1; /* interpreted as error */
1072
1073 if (ph->needs_swap)
1074 nr = bswap_32(nr);
1075
1076 fprintf(fp, "# nrcpus avail : %u\n", nr);
1077 }
1078
1079 static void print_version(struct perf_header *ph, int fd, FILE *fp)
1080 {
1081 char *str = do_read_string(fd, ph);
1082 fprintf(fp, "# perf version : %s\n", str);
1083 free(str);
1084 }
1085
1086 static void print_cmdline(struct perf_header *ph, int fd, FILE *fp)
1087 {
1088 ssize_t ret;
1089 char *str;
1090 u32 nr, i;
1091
1092 ret = read(fd, &nr, sizeof(nr));
1093 if (ret != (ssize_t)sizeof(nr))
1094 return;
1095
1096 if (ph->needs_swap)
1097 nr = bswap_32(nr);
1098
1099 fprintf(fp, "# cmdline : ");
1100
1101 for (i = 0; i < nr; i++) {
1102 str = do_read_string(fd, ph);
1103 fprintf(fp, "%s ", str);
1104 free(str);
1105 }
1106 fputc('\n', fp);
1107 }
1108
1109 static void print_cpu_topology(struct perf_header *ph, int fd, FILE *fp)
1110 {
1111 ssize_t ret;
1112 u32 nr, i;
1113 char *str;
1114
1115 ret = read(fd, &nr, sizeof(nr));
1116 if (ret != (ssize_t)sizeof(nr))
1117 return;
1118
1119 if (ph->needs_swap)
1120 nr = bswap_32(nr);
1121
1122 for (i = 0; i < nr; i++) {
1123 str = do_read_string(fd, ph);
1124 fprintf(fp, "# sibling cores : %s\n", str);
1125 free(str);
1126 }
1127
1128 ret = read(fd, &nr, sizeof(nr));
1129 if (ret != (ssize_t)sizeof(nr))
1130 return;
1131
1132 if (ph->needs_swap)
1133 nr = bswap_32(nr);
1134
1135 for (i = 0; i < nr; i++) {
1136 str = do_read_string(fd, ph);
1137 fprintf(fp, "# sibling threads : %s\n", str);
1138 free(str);
1139 }
1140 }
1141
1142 static void print_event_desc(struct perf_header *ph, int fd, FILE *fp)
1143 {
1144 struct perf_event_attr attr;
1145 uint64_t id;
1146 void *buf = NULL;
1147 char *str;
1148 u32 nre, sz, nr, i, j;
1149 ssize_t ret;
1150 size_t msz;
1151
1152 /* number of events */
1153 ret = read(fd, &nre, sizeof(nre));
1154 if (ret != (ssize_t)sizeof(nre))
1155 goto error;
1156
1157 if (ph->needs_swap)
1158 nre = bswap_32(nre);
1159
1160 ret = read(fd, &sz, sizeof(sz));
1161 if (ret != (ssize_t)sizeof(sz))
1162 goto error;
1163
1164 if (ph->needs_swap)
1165 sz = bswap_32(sz);
1166
1167 memset(&attr, 0, sizeof(attr));
1168
1169 /* buffer to hold on file attr struct */
1170 buf = malloc(sz);
1171 if (!buf)
1172 goto error;
1173
1174 msz = sizeof(attr);
1175 if (sz < msz)
1176 msz = sz;
1177
1178 for (i = 0 ; i < nre; i++) {
1179
1180 /*
1181 * must read entire on-file attr struct to
1182 * sync up with layout.
1183 */
1184 ret = read(fd, buf, sz);
1185 if (ret != (ssize_t)sz)
1186 goto error;
1187
1188 if (ph->needs_swap)
1189 perf_event__attr_swap(buf);
1190
1191 memcpy(&attr, buf, msz);
1192
1193 ret = read(fd, &nr, sizeof(nr));
1194 if (ret != (ssize_t)sizeof(nr))
1195 goto error;
1196
1197 if (ph->needs_swap)
1198 nr = bswap_32(nr);
1199
1200 str = do_read_string(fd, ph);
1201 fprintf(fp, "# event : name = %s, ", str);
1202 free(str);
1203
1204 fprintf(fp, "type = %d, config = 0x%"PRIx64
1205 ", config1 = 0x%"PRIx64", config2 = 0x%"PRIx64,
1206 attr.type,
1207 (u64)attr.config,
1208 (u64)attr.config1,
1209 (u64)attr.config2);
1210
1211 fprintf(fp, ", excl_usr = %d, excl_kern = %d",
1212 attr.exclude_user,
1213 attr.exclude_kernel);
1214
1215 if (nr)
1216 fprintf(fp, ", id = {");
1217
1218 for (j = 0 ; j < nr; j++) {
1219 ret = read(fd, &id, sizeof(id));
1220 if (ret != (ssize_t)sizeof(id))
1221 goto error;
1222
1223 if (ph->needs_swap)
1224 id = bswap_64(id);
1225
1226 if (j)
1227 fputc(',', fp);
1228
1229 fprintf(fp, " %"PRIu64, id);
1230 }
1231 if (nr && j == nr)
1232 fprintf(fp, " }");
1233 fputc('\n', fp);
1234 }
1235 free(buf);
1236 return;
1237 error:
1238 fprintf(fp, "# event desc: not available or unable to read\n");
1239 }
1240
1241 static void print_total_mem(struct perf_header *h __used, int fd, FILE *fp)
1242 {
1243 uint64_t mem;
1244 ssize_t ret;
1245
1246 ret = read(fd, &mem, sizeof(mem));
1247 if (ret != sizeof(mem))
1248 goto error;
1249
1250 if (h->needs_swap)
1251 mem = bswap_64(mem);
1252
1253 fprintf(fp, "# total memory : %"PRIu64" kB\n", mem);
1254 return;
1255 error:
1256 fprintf(fp, "# total memory : unknown\n");
1257 }
1258
1259 static void print_numa_topology(struct perf_header *h __used, int fd, FILE *fp)
1260 {
1261 ssize_t ret;
1262 u32 nr, c, i;
1263 char *str;
1264 uint64_t mem_total, mem_free;
1265
1266 /* nr nodes */
1267 ret = read(fd, &nr, sizeof(nr));
1268 if (ret != (ssize_t)sizeof(nr))
1269 goto error;
1270
1271 if (h->needs_swap)
1272 nr = bswap_32(nr);
1273
1274 for (i = 0; i < nr; i++) {
1275
1276 /* node number */
1277 ret = read(fd, &c, sizeof(c));
1278 if (ret != (ssize_t)sizeof(c))
1279 goto error;
1280
1281 if (h->needs_swap)
1282 c = bswap_32(c);
1283
1284 ret = read(fd, &mem_total, sizeof(u64));
1285 if (ret != sizeof(u64))
1286 goto error;
1287
1288 ret = read(fd, &mem_free, sizeof(u64));
1289 if (ret != sizeof(u64))
1290 goto error;
1291
1292 if (h->needs_swap) {
1293 mem_total = bswap_64(mem_total);
1294 mem_free = bswap_64(mem_free);
1295 }
1296
1297 fprintf(fp, "# node%u meminfo : total = %"PRIu64" kB,"
1298 " free = %"PRIu64" kB\n",
1299 c,
1300 mem_total,
1301 mem_free);
1302
1303 str = do_read_string(fd, h);
1304 fprintf(fp, "# node%u cpu list : %s\n", c, str);
1305 free(str);
1306 }
1307 return;
1308 error:
1309 fprintf(fp, "# numa topology : not available\n");
1310 }
1311
1312 static void print_cpuid(struct perf_header *ph, int fd, FILE *fp)
1313 {
1314 char *str = do_read_string(fd, ph);
1315 fprintf(fp, "# cpuid : %s\n", str);
1316 free(str);
1317 }
1318
1319 static void print_branch_stack(struct perf_header *ph __used, int fd __used,
1320 FILE *fp)
1321 {
1322 fprintf(fp, "# contains samples with branch stack\n");
1323 }
1324
1325 static int __event_process_build_id(struct build_id_event *bev,
1326 char *filename,
1327 struct perf_session *session)
1328 {
1329 int err = -1;
1330 struct list_head *head;
1331 struct machine *machine;
1332 u16 misc;
1333 struct dso *dso;
1334 enum dso_kernel_type dso_type;
1335
1336 machine = perf_session__findnew_machine(session, bev->pid);
1337 if (!machine)
1338 goto out;
1339
1340 misc = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1341
1342 switch (misc) {
1343 case PERF_RECORD_MISC_KERNEL:
1344 dso_type = DSO_TYPE_KERNEL;
1345 head = &machine->kernel_dsos;
1346 break;
1347 case PERF_RECORD_MISC_GUEST_KERNEL:
1348 dso_type = DSO_TYPE_GUEST_KERNEL;
1349 head = &machine->kernel_dsos;
1350 break;
1351 case PERF_RECORD_MISC_USER:
1352 case PERF_RECORD_MISC_GUEST_USER:
1353 dso_type = DSO_TYPE_USER;
1354 head = &machine->user_dsos;
1355 break;
1356 default:
1357 goto out;
1358 }
1359
1360 dso = __dsos__findnew(head, filename);
1361 if (dso != NULL) {
1362 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1363
1364 dso__set_build_id(dso, &bev->build_id);
1365
1366 if (filename[0] == '[')
1367 dso->kernel = dso_type;
1368
1369 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
1370 sbuild_id);
1371 pr_debug("build id event received for %s: %s\n",
1372 dso->long_name, sbuild_id);
1373 }
1374
1375 err = 0;
1376 out:
1377 return err;
1378 }
1379
1380 static int perf_header__read_build_ids_abi_quirk(struct perf_header *header,
1381 int input, u64 offset, u64 size)
1382 {
1383 struct perf_session *session = container_of(header, struct perf_session, header);
1384 struct {
1385 struct perf_event_header header;
1386 u8 build_id[ALIGN(BUILD_ID_SIZE, sizeof(u64))];
1387 char filename[0];
1388 } old_bev;
1389 struct build_id_event bev;
1390 char filename[PATH_MAX];
1391 u64 limit = offset + size;
1392
1393 while (offset < limit) {
1394 ssize_t len;
1395
1396 if (read(input, &old_bev, sizeof(old_bev)) != sizeof(old_bev))
1397 return -1;
1398
1399 if (header->needs_swap)
1400 perf_event_header__bswap(&old_bev.header);
1401
1402 len = old_bev.header.size - sizeof(old_bev);
1403 if (read(input, filename, len) != len)
1404 return -1;
1405
1406 bev.header = old_bev.header;
1407
1408 /*
1409 * As the pid is the missing value, we need to fill
1410 * it properly. The header.misc value give us nice hint.
1411 */
1412 bev.pid = HOST_KERNEL_ID;
1413 if (bev.header.misc == PERF_RECORD_MISC_GUEST_USER ||
1414 bev.header.misc == PERF_RECORD_MISC_GUEST_KERNEL)
1415 bev.pid = DEFAULT_GUEST_KERNEL_ID;
1416
1417 memcpy(bev.build_id, old_bev.build_id, sizeof(bev.build_id));
1418 __event_process_build_id(&bev, filename, session);
1419
1420 offset += bev.header.size;
1421 }
1422
1423 return 0;
1424 }
1425
1426 static int perf_header__read_build_ids(struct perf_header *header,
1427 int input, u64 offset, u64 size)
1428 {
1429 struct perf_session *session = container_of(header, struct perf_session, header);
1430 struct build_id_event bev;
1431 char filename[PATH_MAX];
1432 u64 limit = offset + size, orig_offset = offset;
1433 int err = -1;
1434
1435 while (offset < limit) {
1436 ssize_t len;
1437
1438 if (read(input, &bev, sizeof(bev)) != sizeof(bev))
1439 goto out;
1440
1441 if (header->needs_swap)
1442 perf_event_header__bswap(&bev.header);
1443
1444 len = bev.header.size - sizeof(bev);
1445 if (read(input, filename, len) != len)
1446 goto out;
1447 /*
1448 * The a1645ce1 changeset:
1449 *
1450 * "perf: 'perf kvm' tool for monitoring guest performance from host"
1451 *
1452 * Added a field to struct build_id_event that broke the file
1453 * format.
1454 *
1455 * Since the kernel build-id is the first entry, process the
1456 * table using the old format if the well known
1457 * '[kernel.kallsyms]' string for the kernel build-id has the
1458 * first 4 characters chopped off (where the pid_t sits).
1459 */
1460 if (memcmp(filename, "nel.kallsyms]", 13) == 0) {
1461 if (lseek(input, orig_offset, SEEK_SET) == (off_t)-1)
1462 return -1;
1463 return perf_header__read_build_ids_abi_quirk(header, input, offset, size);
1464 }
1465
1466 __event_process_build_id(&bev, filename, session);
1467
1468 offset += bev.header.size;
1469 }
1470 err = 0;
1471 out:
1472 return err;
1473 }
1474
1475 static int process_tracing_data(struct perf_file_section *section __unused,
1476 struct perf_header *ph __unused,
1477 int feat __unused, int fd, void *data)
1478 {
1479 trace_report(fd, data, false);
1480 return 0;
1481 }
1482
1483 static int process_build_id(struct perf_file_section *section,
1484 struct perf_header *ph,
1485 int feat __unused, int fd, void *data __used)
1486 {
1487 if (perf_header__read_build_ids(ph, fd, section->offset, section->size))
1488 pr_debug("Failed to read buildids, continuing...\n");
1489 return 0;
1490 }
1491
1492 struct feature_ops {
1493 int (*write)(int fd, struct perf_header *h, struct perf_evlist *evlist);
1494 void (*print)(struct perf_header *h, int fd, FILE *fp);
1495 int (*process)(struct perf_file_section *section,
1496 struct perf_header *h, int feat, int fd, void *data);
1497 const char *name;
1498 bool full_only;
1499 };
1500
1501 #define FEAT_OPA(n, func) \
1502 [n] = { .name = #n, .write = write_##func, .print = print_##func }
1503 #define FEAT_OPP(n, func) \
1504 [n] = { .name = #n, .write = write_##func, .print = print_##func, \
1505 .process = process_##func }
1506 #define FEAT_OPF(n, func) \
1507 [n] = { .name = #n, .write = write_##func, .print = print_##func, \
1508 .full_only = true }
1509
1510 /* feature_ops not implemented: */
1511 #define print_tracing_data NULL
1512 #define print_build_id NULL
1513
1514 static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
1515 FEAT_OPP(HEADER_TRACING_DATA, tracing_data),
1516 FEAT_OPP(HEADER_BUILD_ID, build_id),
1517 FEAT_OPA(HEADER_HOSTNAME, hostname),
1518 FEAT_OPA(HEADER_OSRELEASE, osrelease),
1519 FEAT_OPA(HEADER_VERSION, version),
1520 FEAT_OPA(HEADER_ARCH, arch),
1521 FEAT_OPA(HEADER_NRCPUS, nrcpus),
1522 FEAT_OPA(HEADER_CPUDESC, cpudesc),
1523 FEAT_OPA(HEADER_CPUID, cpuid),
1524 FEAT_OPA(HEADER_TOTAL_MEM, total_mem),
1525 FEAT_OPA(HEADER_EVENT_DESC, event_desc),
1526 FEAT_OPA(HEADER_CMDLINE, cmdline),
1527 FEAT_OPF(HEADER_CPU_TOPOLOGY, cpu_topology),
1528 FEAT_OPF(HEADER_NUMA_TOPOLOGY, numa_topology),
1529 FEAT_OPA(HEADER_BRANCH_STACK, branch_stack),
1530 };
1531
1532 struct header_print_data {
1533 FILE *fp;
1534 bool full; /* extended list of headers */
1535 };
1536
1537 static int perf_file_section__fprintf_info(struct perf_file_section *section,
1538 struct perf_header *ph,
1539 int feat, int fd, void *data)
1540 {
1541 struct header_print_data *hd = data;
1542
1543 if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
1544 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
1545 "%d, continuing...\n", section->offset, feat);
1546 return 0;
1547 }
1548 if (feat >= HEADER_LAST_FEATURE) {
1549 pr_warning("unknown feature %d\n", feat);
1550 return 0;
1551 }
1552 if (!feat_ops[feat].print)
1553 return 0;
1554
1555 if (!feat_ops[feat].full_only || hd->full)
1556 feat_ops[feat].print(ph, fd, hd->fp);
1557 else
1558 fprintf(hd->fp, "# %s info available, use -I to display\n",
1559 feat_ops[feat].name);
1560
1561 return 0;
1562 }
1563
1564 int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
1565 {
1566 struct header_print_data hd;
1567 struct perf_header *header = &session->header;
1568 int fd = session->fd;
1569 hd.fp = fp;
1570 hd.full = full;
1571
1572 perf_header__process_sections(header, fd, &hd,
1573 perf_file_section__fprintf_info);
1574 return 0;
1575 }
1576
1577 static int do_write_feat(int fd, struct perf_header *h, int type,
1578 struct perf_file_section **p,
1579 struct perf_evlist *evlist)
1580 {
1581 int err;
1582 int ret = 0;
1583
1584 if (perf_header__has_feat(h, type)) {
1585 if (!feat_ops[type].write)
1586 return -1;
1587
1588 (*p)->offset = lseek(fd, 0, SEEK_CUR);
1589
1590 err = feat_ops[type].write(fd, h, evlist);
1591 if (err < 0) {
1592 pr_debug("failed to write feature %d\n", type);
1593
1594 /* undo anything written */
1595 lseek(fd, (*p)->offset, SEEK_SET);
1596
1597 return -1;
1598 }
1599 (*p)->size = lseek(fd, 0, SEEK_CUR) - (*p)->offset;
1600 (*p)++;
1601 }
1602 return ret;
1603 }
1604
1605 static int perf_header__adds_write(struct perf_header *header,
1606 struct perf_evlist *evlist, int fd)
1607 {
1608 int nr_sections;
1609 struct perf_file_section *feat_sec, *p;
1610 int sec_size;
1611 u64 sec_start;
1612 int feat;
1613 int err;
1614
1615 nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
1616 if (!nr_sections)
1617 return 0;
1618
1619 feat_sec = p = calloc(sizeof(*feat_sec), nr_sections);
1620 if (feat_sec == NULL)
1621 return -ENOMEM;
1622
1623 sec_size = sizeof(*feat_sec) * nr_sections;
1624
1625 sec_start = header->data_offset + header->data_size;
1626 lseek(fd, sec_start + sec_size, SEEK_SET);
1627
1628 for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
1629 if (do_write_feat(fd, header, feat, &p, evlist))
1630 perf_header__clear_feat(header, feat);
1631 }
1632
1633 lseek(fd, sec_start, SEEK_SET);
1634 /*
1635 * may write more than needed due to dropped feature, but
1636 * this is okay, reader will skip the mising entries
1637 */
1638 err = do_write(fd, feat_sec, sec_size);
1639 if (err < 0)
1640 pr_debug("failed to write feature section\n");
1641 free(feat_sec);
1642 return err;
1643 }
1644
1645 int perf_header__write_pipe(int fd)
1646 {
1647 struct perf_pipe_file_header f_header;
1648 int err;
1649
1650 f_header = (struct perf_pipe_file_header){
1651 .magic = PERF_MAGIC,
1652 .size = sizeof(f_header),
1653 };
1654
1655 err = do_write(fd, &f_header, sizeof(f_header));
1656 if (err < 0) {
1657 pr_debug("failed to write perf pipe header\n");
1658 return err;
1659 }
1660
1661 return 0;
1662 }
1663
1664 int perf_session__write_header(struct perf_session *session,
1665 struct perf_evlist *evlist,
1666 int fd, bool at_exit)
1667 {
1668 struct perf_file_header f_header;
1669 struct perf_file_attr f_attr;
1670 struct perf_header *header = &session->header;
1671 struct perf_evsel *attr, *pair = NULL;
1672 int err;
1673
1674 lseek(fd, sizeof(f_header), SEEK_SET);
1675
1676 if (session->evlist != evlist)
1677 pair = list_entry(session->evlist->entries.next, struct perf_evsel, node);
1678
1679 list_for_each_entry(attr, &evlist->entries, node) {
1680 attr->id_offset = lseek(fd, 0, SEEK_CUR);
1681 err = do_write(fd, attr->id, attr->ids * sizeof(u64));
1682 if (err < 0) {
1683 out_err_write:
1684 pr_debug("failed to write perf header\n");
1685 return err;
1686 }
1687 if (session->evlist != evlist) {
1688 err = do_write(fd, pair->id, pair->ids * sizeof(u64));
1689 if (err < 0)
1690 goto out_err_write;
1691 attr->ids += pair->ids;
1692 pair = list_entry(pair->node.next, struct perf_evsel, node);
1693 }
1694 }
1695
1696 header->attr_offset = lseek(fd, 0, SEEK_CUR);
1697
1698 list_for_each_entry(attr, &evlist->entries, node) {
1699 f_attr = (struct perf_file_attr){
1700 .attr = attr->attr,
1701 .ids = {
1702 .offset = attr->id_offset,
1703 .size = attr->ids * sizeof(u64),
1704 }
1705 };
1706 err = do_write(fd, &f_attr, sizeof(f_attr));
1707 if (err < 0) {
1708 pr_debug("failed to write perf header attribute\n");
1709 return err;
1710 }
1711 }
1712
1713 header->event_offset = lseek(fd, 0, SEEK_CUR);
1714 header->event_size = event_count * sizeof(struct perf_trace_event_type);
1715 if (events) {
1716 err = do_write(fd, events, header->event_size);
1717 if (err < 0) {
1718 pr_debug("failed to write perf header events\n");
1719 return err;
1720 }
1721 }
1722
1723 header->data_offset = lseek(fd, 0, SEEK_CUR);
1724
1725 if (at_exit) {
1726 err = perf_header__adds_write(header, evlist, fd);
1727 if (err < 0)
1728 return err;
1729 }
1730
1731 f_header = (struct perf_file_header){
1732 .magic = PERF_MAGIC,
1733 .size = sizeof(f_header),
1734 .attr_size = sizeof(f_attr),
1735 .attrs = {
1736 .offset = header->attr_offset,
1737 .size = evlist->nr_entries * sizeof(f_attr),
1738 },
1739 .data = {
1740 .offset = header->data_offset,
1741 .size = header->data_size,
1742 },
1743 .event_types = {
1744 .offset = header->event_offset,
1745 .size = header->event_size,
1746 },
1747 };
1748
1749 memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));
1750
1751 lseek(fd, 0, SEEK_SET);
1752 err = do_write(fd, &f_header, sizeof(f_header));
1753 if (err < 0) {
1754 pr_debug("failed to write perf header\n");
1755 return err;
1756 }
1757 lseek(fd, header->data_offset + header->data_size, SEEK_SET);
1758
1759 header->frozen = 1;
1760 return 0;
1761 }
1762
1763 static int perf_header__getbuffer64(struct perf_header *header,
1764 int fd, void *buf, size_t size)
1765 {
1766 if (readn(fd, buf, size) <= 0)
1767 return -1;
1768
1769 if (header->needs_swap)
1770 mem_bswap_64(buf, size);
1771
1772 return 0;
1773 }
1774
1775 int perf_header__process_sections(struct perf_header *header, int fd,
1776 void *data,
1777 int (*process)(struct perf_file_section *section,
1778 struct perf_header *ph,
1779 int feat, int fd, void *data))
1780 {
1781 struct perf_file_section *feat_sec, *sec;
1782 int nr_sections;
1783 int sec_size;
1784 int feat;
1785 int err;
1786
1787 nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
1788 if (!nr_sections)
1789 return 0;
1790
1791 feat_sec = sec = calloc(sizeof(*feat_sec), nr_sections);
1792 if (!feat_sec)
1793 return -1;
1794
1795 sec_size = sizeof(*feat_sec) * nr_sections;
1796
1797 lseek(fd, header->data_offset + header->data_size, SEEK_SET);
1798
1799 err = perf_header__getbuffer64(header, fd, feat_sec, sec_size);
1800 if (err < 0)
1801 goto out_free;
1802
1803 for_each_set_bit(feat, header->adds_features, HEADER_LAST_FEATURE) {
1804 err = process(sec++, header, feat, fd, data);
1805 if (err < 0)
1806 goto out_free;
1807 }
1808 err = 0;
1809 out_free:
1810 free(feat_sec);
1811 return err;
1812 }
1813
1814 static const int attr_file_abi_sizes[] = {
1815 [0] = PERF_ATTR_SIZE_VER0,
1816 [1] = PERF_ATTR_SIZE_VER1,
1817 0,
1818 };
1819
1820 /*
1821 * In the legacy file format, the magic number is not used to encode endianness.
1822 * hdr_sz was used to encode endianness. But given that hdr_sz can vary based
1823 * on ABI revisions, we need to try all combinations for all endianness to
1824 * detect the endianness.
1825 */
1826 static int try_all_file_abis(uint64_t hdr_sz, struct perf_header *ph)
1827 {
1828 uint64_t ref_size, attr_size;
1829 int i;
1830
1831 for (i = 0 ; attr_file_abi_sizes[i]; i++) {
1832 ref_size = attr_file_abi_sizes[i]
1833 + sizeof(struct perf_file_section);
1834 if (hdr_sz != ref_size) {
1835 attr_size = bswap_64(hdr_sz);
1836 if (attr_size != ref_size)
1837 continue;
1838
1839 ph->needs_swap = true;
1840 }
1841 pr_debug("ABI%d perf.data file detected, need_swap=%d\n",
1842 i,
1843 ph->needs_swap);
1844 return 0;
1845 }
1846 /* could not determine endianness */
1847 return -1;
1848 }
1849
1850 #define PERF_PIPE_HDR_VER0 16
1851
1852 static const size_t attr_pipe_abi_sizes[] = {
1853 [0] = PERF_PIPE_HDR_VER0,
1854 0,
1855 };
1856
1857 /*
1858 * In the legacy pipe format, there is an implicit assumption that endiannesss
1859 * between host recording the samples, and host parsing the samples is the
1860 * same. This is not always the case given that the pipe output may always be
1861 * redirected into a file and analyzed on a different machine with possibly a
1862 * different endianness and perf_event ABI revsions in the perf tool itself.
1863 */
1864 static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph)
1865 {
1866 u64 attr_size;
1867 int i;
1868
1869 for (i = 0 ; attr_pipe_abi_sizes[i]; i++) {
1870 if (hdr_sz != attr_pipe_abi_sizes[i]) {
1871 attr_size = bswap_64(hdr_sz);
1872 if (attr_size != hdr_sz)
1873 continue;
1874
1875 ph->needs_swap = true;
1876 }
1877 pr_debug("Pipe ABI%d perf.data file detected\n", i);
1878 return 0;
1879 }
1880 return -1;
1881 }
1882
1883 static int check_magic_endian(u64 magic, uint64_t hdr_sz,
1884 bool is_pipe, struct perf_header *ph)
1885 {
1886 int ret;
1887
1888 /* check for legacy format */
1889 ret = memcmp(&magic, __perf_magic1, sizeof(magic));
1890 if (ret == 0) {
1891 pr_debug("legacy perf.data format\n");
1892 if (is_pipe)
1893 return try_all_pipe_abis(hdr_sz, ph);
1894
1895 return try_all_file_abis(hdr_sz, ph);
1896 }
1897 /*
1898 * the new magic number serves two purposes:
1899 * - unique number to identify actual perf.data files
1900 * - encode endianness of file
1901 */
1902
1903 /* check magic number with one endianness */
1904 if (magic == __perf_magic2)
1905 return 0;
1906
1907 /* check magic number with opposite endianness */
1908 if (magic != __perf_magic2_sw)
1909 return -1;
1910
1911 ph->needs_swap = true;
1912
1913 return 0;
1914 }
1915
1916 int perf_file_header__read(struct perf_file_header *header,
1917 struct perf_header *ph, int fd)
1918 {
1919 int ret;
1920
1921 lseek(fd, 0, SEEK_SET);
1922
1923 ret = readn(fd, header, sizeof(*header));
1924 if (ret <= 0)
1925 return -1;
1926
1927 if (check_magic_endian(header->magic,
1928 header->attr_size, false, ph) < 0) {
1929 pr_debug("magic/endian check failed\n");
1930 return -1;
1931 }
1932
1933 if (ph->needs_swap) {
1934 mem_bswap_64(header, offsetof(struct perf_file_header,
1935 adds_features));
1936 }
1937
1938 if (header->size != sizeof(*header)) {
1939 /* Support the previous format */
1940 if (header->size == offsetof(typeof(*header), adds_features))
1941 bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
1942 else
1943 return -1;
1944 } else if (ph->needs_swap) {
1945 /*
1946 * feature bitmap is declared as an array of unsigned longs --
1947 * not good since its size can differ between the host that
1948 * generated the data file and the host analyzing the file.
1949 *
1950 * We need to handle endianness, but we don't know the size of
1951 * the unsigned long where the file was generated. Take a best
1952 * guess at determining it: try 64-bit swap first (ie., file
1953 * created on a 64-bit host), and check if the hostname feature
1954 * bit is set (this feature bit is forced on as of fbe96f2).
1955 * If the bit is not, undo the 64-bit swap and try a 32-bit
1956 * swap. If the hostname bit is still not set (e.g., older data
1957 * file), punt and fallback to the original behavior --
1958 * clearing all feature bits and setting buildid.
1959 */
1960 mem_bswap_64(&header->adds_features,
1961 BITS_TO_U64(HEADER_FEAT_BITS));
1962
1963 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
1964 /* unswap as u64 */
1965 mem_bswap_64(&header->adds_features,
1966 BITS_TO_U64(HEADER_FEAT_BITS));
1967
1968 /* unswap as u32 */
1969 mem_bswap_32(&header->adds_features,
1970 BITS_TO_U32(HEADER_FEAT_BITS));
1971 }
1972
1973 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
1974 bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
1975 set_bit(HEADER_BUILD_ID, header->adds_features);
1976 }
1977 }
1978
1979 memcpy(&ph->adds_features, &header->adds_features,
1980 sizeof(ph->adds_features));
1981
1982 ph->event_offset = header->event_types.offset;
1983 ph->event_size = header->event_types.size;
1984 ph->data_offset = header->data.offset;
1985 ph->data_size = header->data.size;
1986 return 0;
1987 }
1988
1989 static int perf_file_section__process(struct perf_file_section *section,
1990 struct perf_header *ph,
1991 int feat, int fd, void *data)
1992 {
1993 if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
1994 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
1995 "%d, continuing...\n", section->offset, feat);
1996 return 0;
1997 }
1998
1999 if (feat >= HEADER_LAST_FEATURE) {
2000 pr_debug("unknown feature %d, continuing...\n", feat);
2001 return 0;
2002 }
2003
2004 if (!feat_ops[feat].process)
2005 return 0;
2006
2007 return feat_ops[feat].process(section, ph, feat, fd, data);
2008 }
2009
2010 static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
2011 struct perf_header *ph, int fd,
2012 bool repipe)
2013 {
2014 int ret;
2015
2016 ret = readn(fd, header, sizeof(*header));
2017 if (ret <= 0)
2018 return -1;
2019
2020 if (check_magic_endian(header->magic, header->size, true, ph) < 0) {
2021 pr_debug("endian/magic failed\n");
2022 return -1;
2023 }
2024
2025 if (ph->needs_swap)
2026 header->size = bswap_64(header->size);
2027
2028 if (repipe && do_write(STDOUT_FILENO, header, sizeof(*header)) < 0)
2029 return -1;
2030
2031 return 0;
2032 }
2033
2034 static int perf_header__read_pipe(struct perf_session *session, int fd)
2035 {
2036 struct perf_header *header = &session->header;
2037 struct perf_pipe_file_header f_header;
2038
2039 if (perf_file_header__read_pipe(&f_header, header, fd,
2040 session->repipe) < 0) {
2041 pr_debug("incompatible file format\n");
2042 return -EINVAL;
2043 }
2044
2045 session->fd = fd;
2046
2047 return 0;
2048 }
2049
2050 static int read_attr(int fd, struct perf_header *ph,
2051 struct perf_file_attr *f_attr)
2052 {
2053 struct perf_event_attr *attr = &f_attr->attr;
2054 size_t sz, left;
2055 size_t our_sz = sizeof(f_attr->attr);
2056 int ret;
2057
2058 memset(f_attr, 0, sizeof(*f_attr));
2059
2060 /* read minimal guaranteed structure */
2061 ret = readn(fd, attr, PERF_ATTR_SIZE_VER0);
2062 if (ret <= 0) {
2063 pr_debug("cannot read %d bytes of header attr\n",
2064 PERF_ATTR_SIZE_VER0);
2065 return -1;
2066 }
2067
2068 /* on file perf_event_attr size */
2069 sz = attr->size;
2070
2071 if (ph->needs_swap)
2072 sz = bswap_32(sz);
2073
2074 if (sz == 0) {
2075 /* assume ABI0 */
2076 sz = PERF_ATTR_SIZE_VER0;
2077 } else if (sz > our_sz) {
2078 pr_debug("file uses a more recent and unsupported ABI"
2079 " (%zu bytes extra)\n", sz - our_sz);
2080 return -1;
2081 }
2082 /* what we have not yet read and that we know about */
2083 left = sz - PERF_ATTR_SIZE_VER0;
2084 if (left) {
2085 void *ptr = attr;
2086 ptr += PERF_ATTR_SIZE_VER0;
2087
2088 ret = readn(fd, ptr, left);
2089 }
2090 /* read perf_file_section, ids are read in caller */
2091 ret = readn(fd, &f_attr->ids, sizeof(f_attr->ids));
2092
2093 return ret <= 0 ? -1 : 0;
2094 }
2095
2096 static int perf_evsel__set_tracepoint_name(struct perf_evsel *evsel,
2097 struct pevent *pevent)
2098 {
2099 struct event_format *event = pevent_find_event(pevent,
2100 evsel->attr.config);
2101 char bf[128];
2102
2103 if (event == NULL)
2104 return -1;
2105
2106 snprintf(bf, sizeof(bf), "%s:%s", event->system, event->name);
2107 evsel->name = strdup(bf);
2108 if (event->name == NULL)
2109 return -1;
2110
2111 return 0;
2112 }
2113
2114 static int perf_evlist__set_tracepoint_names(struct perf_evlist *evlist,
2115 struct pevent *pevent)
2116 {
2117 struct perf_evsel *pos;
2118
2119 list_for_each_entry(pos, &evlist->entries, node) {
2120 if (pos->attr.type == PERF_TYPE_TRACEPOINT &&
2121 perf_evsel__set_tracepoint_name(pos, pevent))
2122 return -1;
2123 }
2124
2125 return 0;
2126 }
2127
2128 int perf_session__read_header(struct perf_session *session, int fd)
2129 {
2130 struct perf_header *header = &session->header;
2131 struct perf_file_header f_header;
2132 struct perf_file_attr f_attr;
2133 u64 f_id;
2134 int nr_attrs, nr_ids, i, j;
2135
2136 session->evlist = perf_evlist__new(NULL, NULL);
2137 if (session->evlist == NULL)
2138 return -ENOMEM;
2139
2140 if (session->fd_pipe)
2141 return perf_header__read_pipe(session, fd);
2142
2143 if (perf_file_header__read(&f_header, header, fd) < 0)
2144 return -EINVAL;
2145
2146 nr_attrs = f_header.attrs.size / f_header.attr_size;
2147 lseek(fd, f_header.attrs.offset, SEEK_SET);
2148
2149 for (i = 0; i < nr_attrs; i++) {
2150 struct perf_evsel *evsel;
2151 off_t tmp;
2152
2153 if (read_attr(fd, header, &f_attr) < 0)
2154 goto out_errno;
2155
2156 if (header->needs_swap)
2157 perf_event__attr_swap(&f_attr.attr);
2158
2159 tmp = lseek(fd, 0, SEEK_CUR);
2160 evsel = perf_evsel__new(&f_attr.attr, i);
2161
2162 if (evsel == NULL)
2163 goto out_delete_evlist;
2164 /*
2165 * Do it before so that if perf_evsel__alloc_id fails, this
2166 * entry gets purged too at perf_evlist__delete().
2167 */
2168 perf_evlist__add(session->evlist, evsel);
2169
2170 nr_ids = f_attr.ids.size / sizeof(u64);
2171 /*
2172 * We don't have the cpu and thread maps on the header, so
2173 * for allocating the perf_sample_id table we fake 1 cpu and
2174 * hattr->ids threads.
2175 */
2176 if (perf_evsel__alloc_id(evsel, 1, nr_ids))
2177 goto out_delete_evlist;
2178
2179 lseek(fd, f_attr.ids.offset, SEEK_SET);
2180
2181 for (j = 0; j < nr_ids; j++) {
2182 if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))
2183 goto out_errno;
2184
2185 perf_evlist__id_add(session->evlist, evsel, 0, j, f_id);
2186 }
2187
2188 lseek(fd, tmp, SEEK_SET);
2189 }
2190
2191 symbol_conf.nr_events = nr_attrs;
2192
2193 if (f_header.event_types.size) {
2194 lseek(fd, f_header.event_types.offset, SEEK_SET);
2195 events = malloc(f_header.event_types.size);
2196 if (events == NULL)
2197 return -ENOMEM;
2198 if (perf_header__getbuffer64(header, fd, events,
2199 f_header.event_types.size))
2200 goto out_errno;
2201 event_count = f_header.event_types.size / sizeof(struct perf_trace_event_type);
2202 }
2203
2204 perf_header__process_sections(header, fd, &session->pevent,
2205 perf_file_section__process);
2206
2207 lseek(fd, header->data_offset, SEEK_SET);
2208
2209 if (perf_evlist__set_tracepoint_names(session->evlist, session->pevent))
2210 goto out_delete_evlist;
2211
2212 header->frozen = 1;
2213 return 0;
2214 out_errno:
2215 return -errno;
2216
2217 out_delete_evlist:
2218 perf_evlist__delete(session->evlist);
2219 session->evlist = NULL;
2220 return -ENOMEM;
2221 }
2222
2223 int perf_event__synthesize_attr(struct perf_tool *tool,
2224 struct perf_event_attr *attr, u16 ids, u64 *id,
2225 perf_event__handler_t process)
2226 {
2227 union perf_event *ev;
2228 size_t size;
2229 int err;
2230
2231 size = sizeof(struct perf_event_attr);
2232 size = ALIGN(size, sizeof(u64));
2233 size += sizeof(struct perf_event_header);
2234 size += ids * sizeof(u64);
2235
2236 ev = malloc(size);
2237
2238 if (ev == NULL)
2239 return -ENOMEM;
2240
2241 ev->attr.attr = *attr;
2242 memcpy(ev->attr.id, id, ids * sizeof(u64));
2243
2244 ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2245 ev->attr.header.size = size;
2246
2247 err = process(tool, ev, NULL, NULL);
2248
2249 free(ev);
2250
2251 return err;
2252 }
2253
2254 int perf_event__synthesize_attrs(struct perf_tool *tool,
2255 struct perf_session *session,
2256 perf_event__handler_t process)
2257 {
2258 struct perf_evsel *attr;
2259 int err = 0;
2260
2261 list_for_each_entry(attr, &session->evlist->entries, node) {
2262 err = perf_event__synthesize_attr(tool, &attr->attr, attr->ids,
2263 attr->id, process);
2264 if (err) {
2265 pr_debug("failed to create perf header attribute\n");
2266 return err;
2267 }
2268 }
2269
2270 return err;
2271 }
2272
2273 int perf_event__process_attr(union perf_event *event,
2274 struct perf_evlist **pevlist)
2275 {
2276 unsigned int i, ids, n_ids;
2277 struct perf_evsel *evsel;
2278 struct perf_evlist *evlist = *pevlist;
2279
2280 if (evlist == NULL) {
2281 *pevlist = evlist = perf_evlist__new(NULL, NULL);
2282 if (evlist == NULL)
2283 return -ENOMEM;
2284 }
2285
2286 evsel = perf_evsel__new(&event->attr.attr, evlist->nr_entries);
2287 if (evsel == NULL)
2288 return -ENOMEM;
2289
2290 perf_evlist__add(evlist, evsel);
2291
2292 ids = event->header.size;
2293 ids -= (void *)&event->attr.id - (void *)event;
2294 n_ids = ids / sizeof(u64);
2295 /*
2296 * We don't have the cpu and thread maps on the header, so
2297 * for allocating the perf_sample_id table we fake 1 cpu and
2298 * hattr->ids threads.
2299 */
2300 if (perf_evsel__alloc_id(evsel, 1, n_ids))
2301 return -ENOMEM;
2302
2303 for (i = 0; i < n_ids; i++) {
2304 perf_evlist__id_add(evlist, evsel, 0, i, event->attr.id[i]);
2305 }
2306
2307 return 0;
2308 }
2309
2310 int perf_event__synthesize_event_type(struct perf_tool *tool,
2311 u64 event_id, char *name,
2312 perf_event__handler_t process,
2313 struct machine *machine)
2314 {
2315 union perf_event ev;
2316 size_t size = 0;
2317 int err = 0;
2318
2319 memset(&ev, 0, sizeof(ev));
2320
2321 ev.event_type.event_type.event_id = event_id;
2322 memset(ev.event_type.event_type.name, 0, MAX_EVENT_NAME);
2323 strncpy(ev.event_type.event_type.name, name, MAX_EVENT_NAME - 1);
2324
2325 ev.event_type.header.type = PERF_RECORD_HEADER_EVENT_TYPE;
2326 size = strlen(ev.event_type.event_type.name);
2327 size = ALIGN(size, sizeof(u64));
2328 ev.event_type.header.size = sizeof(ev.event_type) -
2329 (sizeof(ev.event_type.event_type.name) - size);
2330
2331 err = process(tool, &ev, NULL, machine);
2332
2333 return err;
2334 }
2335
2336 int perf_event__synthesize_event_types(struct perf_tool *tool,
2337 perf_event__handler_t process,
2338 struct machine *machine)
2339 {
2340 struct perf_trace_event_type *type;
2341 int i, err = 0;
2342
2343 for (i = 0; i < event_count; i++) {
2344 type = &events[i];
2345
2346 err = perf_event__synthesize_event_type(tool, type->event_id,
2347 type->name, process,
2348 machine);
2349 if (err) {
2350 pr_debug("failed to create perf header event type\n");
2351 return err;
2352 }
2353 }
2354
2355 return err;
2356 }
2357
2358 int perf_event__process_event_type(struct perf_tool *tool __unused,
2359 union perf_event *event)
2360 {
2361 if (perf_header__push_event(event->event_type.event_type.event_id,
2362 event->event_type.event_type.name) < 0)
2363 return -ENOMEM;
2364
2365 return 0;
2366 }
2367
2368 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd,
2369 struct perf_evlist *evlist,
2370 perf_event__handler_t process)
2371 {
2372 union perf_event ev;
2373 struct tracing_data *tdata;
2374 ssize_t size = 0, aligned_size = 0, padding;
2375 int err __used = 0;
2376
2377 /*
2378 * We are going to store the size of the data followed
2379 * by the data contents. Since the fd descriptor is a pipe,
2380 * we cannot seek back to store the size of the data once
2381 * we know it. Instead we:
2382 *
2383 * - write the tracing data to the temp file
2384 * - get/write the data size to pipe
2385 * - write the tracing data from the temp file
2386 * to the pipe
2387 */
2388 tdata = tracing_data_get(&evlist->entries, fd, true);
2389 if (!tdata)
2390 return -1;
2391
2392 memset(&ev, 0, sizeof(ev));
2393
2394 ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
2395 size = tdata->size;
2396 aligned_size = ALIGN(size, sizeof(u64));
2397 padding = aligned_size - size;
2398 ev.tracing_data.header.size = sizeof(ev.tracing_data);
2399 ev.tracing_data.size = aligned_size;
2400
2401 process(tool, &ev, NULL, NULL);
2402
2403 /*
2404 * The put function will copy all the tracing data
2405 * stored in temp file to the pipe.
2406 */
2407 tracing_data_put(tdata);
2408
2409 write_padded(fd, NULL, 0, padding);
2410
2411 return aligned_size;
2412 }
2413
2414 int perf_event__process_tracing_data(union perf_event *event,
2415 struct perf_session *session)
2416 {
2417 ssize_t size_read, padding, size = event->tracing_data.size;
2418 off_t offset = lseek(session->fd, 0, SEEK_CUR);
2419 char buf[BUFSIZ];
2420
2421 /* setup for reading amidst mmap */
2422 lseek(session->fd, offset + sizeof(struct tracing_data_event),
2423 SEEK_SET);
2424
2425 size_read = trace_report(session->fd, &session->pevent,
2426 session->repipe);
2427 padding = ALIGN(size_read, sizeof(u64)) - size_read;
2428
2429 if (read(session->fd, buf, padding) < 0)
2430 die("reading input file");
2431 if (session->repipe) {
2432 int retw = write(STDOUT_FILENO, buf, padding);
2433 if (retw <= 0 || retw != padding)
2434 die("repiping tracing data padding");
2435 }
2436
2437 if (size_read + padding != size)
2438 die("tracing data size mismatch");
2439
2440 return size_read + padding;
2441 }
2442
2443 int perf_event__synthesize_build_id(struct perf_tool *tool,
2444 struct dso *pos, u16 misc,
2445 perf_event__handler_t process,
2446 struct machine *machine)
2447 {
2448 union perf_event ev;
2449 size_t len;
2450 int err = 0;
2451
2452 if (!pos->hit)
2453 return err;
2454
2455 memset(&ev, 0, sizeof(ev));
2456
2457 len = pos->long_name_len + 1;
2458 len = ALIGN(len, NAME_ALIGN);
2459 memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
2460 ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
2461 ev.build_id.header.misc = misc;
2462 ev.build_id.pid = machine->pid;
2463 ev.build_id.header.size = sizeof(ev.build_id) + len;
2464 memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
2465
2466 err = process(tool, &ev, NULL, machine);
2467
2468 return err;
2469 }
2470
2471 int perf_event__process_build_id(struct perf_tool *tool __used,
2472 union perf_event *event,
2473 struct perf_session *session)
2474 {
2475 __event_process_build_id(&event->build_id,
2476 event->build_id.filename,
2477 session);
2478 return 0;
2479 }
2480
2481 void disable_buildid_cache(void)
2482 {
2483 no_buildid_cache = true;
2484 }
Linux kernel - Deliverables
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