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perf evsel: Set attr.task bit for a tracking event
[linux-2.6/btrfs-unstable.git] / tools / perf / util / header.c
blob1f407f7352a7fd2bab67ad13e63e5fcd053495ba
1 #include "util.h"
2 #include <sys/types.h>
3 #include <byteswap.h>
4 #include <unistd.h>
5 #include <stdio.h>
6 #include <stdlib.h>
7 #include <linux/list.h>
8 #include <linux/kernel.h>
9 #include <linux/bitops.h>
10 #include <sys/utsname.h>
11
12 #include "evlist.h"
13 #include "evsel.h"
14 #include "header.h"
15 #include "../perf.h"
16 #include "trace-event.h"
17 #include "session.h"
18 #include "symbol.h"
19 #include "debug.h"
20 #include "cpumap.h"
21 #include "pmu.h"
22 #include "vdso.h"
23 #include "strbuf.h"
24 #include "build-id.h"
25 #include "data.h"
26
27 static u32 header_argc;
28 static const char **header_argv;
29
30 /*
31 * magic2 = "PERFILE2"
32 * must be a numerical value to let the endianness
33 * determine the memory layout. That way we are able
34 * to detect endianness when reading the perf.data file
35 * back.
36 *
37 * we check for legacy (PERFFILE) format.
38 */
39 static const char *__perf_magic1 = "PERFFILE";
40 static const u64 __perf_magic2 = 0x32454c4946524550ULL;
41 static const u64 __perf_magic2_sw = 0x50455246494c4532ULL;
42
43 #define PERF_MAGIC __perf_magic2
44
45 struct perf_file_attr {
46 struct perf_event_attr attr;
47 struct perf_file_section ids;
48 };
49
50 void perf_header__set_feat(struct perf_header *header, int feat)
51 {
52 set_bit(feat, header->adds_features);
53 }
54
55 void perf_header__clear_feat(struct perf_header *header, int feat)
56 {
57 clear_bit(feat, header->adds_features);
58 }
59
60 bool perf_header__has_feat(const struct perf_header *header, int feat)
61 {
62 return test_bit(feat, header->adds_features);
63 }
64
65 static int do_write(int fd, const void *buf, size_t size)
66 {
67 while (size) {
68 int ret = write(fd, buf, size);
69
70 if (ret < 0)
71 return -errno;
72
73 size -= ret;
74 buf += ret;
75 }
76
77 return 0;
78 }
79
80 int write_padded(int fd, const void *bf, size_t count, size_t count_aligned)
81 {
82 static const char zero_buf[NAME_ALIGN];
83 int err = do_write(fd, bf, count);
84
85 if (!err)
86 err = do_write(fd, zero_buf, count_aligned - count);
87
88 return err;
89 }
90
91 static int do_write_string(int fd, const char *str)
92 {
93 u32 len, olen;
94 int ret;
95
96 olen = strlen(str) + 1;
97 len = PERF_ALIGN(olen, NAME_ALIGN);
98
99 /* write len, incl. \0 */
100 ret = do_write(fd, &len, sizeof(len));
101 if (ret < 0)
102 return ret;
103
104 return write_padded(fd, str, olen, len);
105 }
106
107 static char *do_read_string(int fd, struct perf_header *ph)
108 {
109 ssize_t sz, ret;
110 u32 len;
111 char *buf;
112
113 sz = readn(fd, &len, sizeof(len));
114 if (sz < (ssize_t)sizeof(len))
115 return NULL;
116
117 if (ph->needs_swap)
118 len = bswap_32(len);
119
120 buf = malloc(len);
121 if (!buf)
122 return NULL;
123
124 ret = readn(fd, buf, len);
125 if (ret == (ssize_t)len) {
126 /*
127 * strings are padded by zeroes
128 * thus the actual strlen of buf
129 * may be less than len
130 */
131 return buf;
132 }
133
134 free(buf);
135 return NULL;
136 }
137
138 int
139 perf_header__set_cmdline(int argc, const char **argv)
140 {
141 int i;
142
143 /*
144 * If header_argv has already been set, do not override it.
145 * This allows a command to set the cmdline, parse args and
146 * then call another builtin function that implements a
147 * command -- e.g, cmd_kvm calling cmd_record.
148 */
149 if (header_argv)
150 return 0;
151
152 header_argc = (u32)argc;
153
154 /* do not include NULL termination */
155 header_argv = calloc(argc, sizeof(char *));
156 if (!header_argv)
157 return -ENOMEM;
158
159 /*
160 * must copy argv contents because it gets moved
161 * around during option parsing
162 */
163 for (i = 0; i < argc ; i++)
164 header_argv[i] = argv[i];
165
166 return 0;
167 }
168
169 static int write_tracing_data(int fd, struct perf_header *h __maybe_unused,
170 struct perf_evlist *evlist)
171 {
172 return read_tracing_data(fd, &evlist->entries);
173 }
174
175
176 static int write_build_id(int fd, struct perf_header *h,
177 struct perf_evlist *evlist __maybe_unused)
178 {
179 struct perf_session *session;
180 int err;
181
182 session = container_of(h, struct perf_session, header);
183
184 if (!perf_session__read_build_ids(session, true))
185 return -1;
186
187 err = perf_session__write_buildid_table(session, fd);
188 if (err < 0) {
189 pr_debug("failed to write buildid table\n");
190 return err;
191 }
192 perf_session__cache_build_ids(session);
193
194 return 0;
195 }
196
197 static int write_hostname(int fd, struct perf_header *h __maybe_unused,
198 struct perf_evlist *evlist __maybe_unused)
199 {
200 struct utsname uts;
201 int ret;
202
203 ret = uname(&uts);
204 if (ret < 0)
205 return -1;
206
207 return do_write_string(fd, uts.nodename);
208 }
209
210 static int write_osrelease(int fd, struct perf_header *h __maybe_unused,
211 struct perf_evlist *evlist __maybe_unused)
212 {
213 struct utsname uts;
214 int ret;
215
216 ret = uname(&uts);
217 if (ret < 0)
218 return -1;
219
220 return do_write_string(fd, uts.release);
221 }
222
223 static int write_arch(int fd, struct perf_header *h __maybe_unused,
224 struct perf_evlist *evlist __maybe_unused)
225 {
226 struct utsname uts;
227 int ret;
228
229 ret = uname(&uts);
230 if (ret < 0)
231 return -1;
232
233 return do_write_string(fd, uts.machine);
234 }
235
236 static int write_version(int fd, struct perf_header *h __maybe_unused,
237 struct perf_evlist *evlist __maybe_unused)
238 {
239 return do_write_string(fd, perf_version_string);
240 }
241
242 static int __write_cpudesc(int fd, const char *cpuinfo_proc)
243 {
244 FILE *file;
245 char *buf = NULL;
246 char *s, *p;
247 const char *search = cpuinfo_proc;
248 size_t len = 0;
249 int ret = -1;
250
251 if (!search)
252 return -1;
253
254 file = fopen("/proc/cpuinfo", "r");
255 if (!file)
256 return -1;
257
258 while (getline(&buf, &len, file) > 0) {
259 ret = strncmp(buf, search, strlen(search));
260 if (!ret)
261 break;
262 }
263
264 if (ret) {
265 ret = -1;
266 goto done;
267 }
268
269 s = buf;
270
271 p = strchr(buf, ':');
272 if (p && *(p+1) == ' ' && *(p+2))
273 s = p + 2;
274 p = strchr(s, '\n');
275 if (p)
276 *p = '\0';
277
278 /* squash extra space characters (branding string) */
279 p = s;
280 while (*p) {
281 if (isspace(*p)) {
282 char *r = p + 1;
283 char *q = r;
284 *p = ' ';
285 while (*q && isspace(*q))
286 q++;
287 if (q != (p+1))
288 while ((*r++ = *q++));
289 }
290 p++;
291 }
292 ret = do_write_string(fd, s);
293 done:
294 free(buf);
295 fclose(file);
296 return ret;
297 }
298
299 static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,
300 struct perf_evlist *evlist __maybe_unused)
301 {
302 #ifndef CPUINFO_PROC
303 #define CPUINFO_PROC {"model name", }
304 #endif
305 const char *cpuinfo_procs[] = CPUINFO_PROC;
306 unsigned int i;
307
308 for (i = 0; i < ARRAY_SIZE(cpuinfo_procs); i++) {
309 int ret;
310 ret = __write_cpudesc(fd, cpuinfo_procs[i]);
311 if (ret >= 0)
312 return ret;
313 }
314 return -1;
315 }
316
317
318 static int write_nrcpus(int fd, struct perf_header *h __maybe_unused,
319 struct perf_evlist *evlist __maybe_unused)
320 {
321 long nr;
322 u32 nrc, nra;
323 int ret;
324
325 nr = sysconf(_SC_NPROCESSORS_CONF);
326 if (nr < 0)
327 return -1;
328
329 nrc = (u32)(nr & UINT_MAX);
330
331 nr = sysconf(_SC_NPROCESSORS_ONLN);
332 if (nr < 0)
333 return -1;
334
335 nra = (u32)(nr & UINT_MAX);
336
337 ret = do_write(fd, &nrc, sizeof(nrc));
338 if (ret < 0)
339 return ret;
340
341 return do_write(fd, &nra, sizeof(nra));
342 }
343
344 static int write_event_desc(int fd, struct perf_header *h __maybe_unused,
345 struct perf_evlist *evlist)
346 {
347 struct perf_evsel *evsel;
348 u32 nre, nri, sz;
349 int ret;
350
351 nre = evlist->nr_entries;
352
353 /*
354 * write number of events
355 */
356 ret = do_write(fd, &nre, sizeof(nre));
357 if (ret < 0)
358 return ret;
359
360 /*
361 * size of perf_event_attr struct
362 */
363 sz = (u32)sizeof(evsel->attr);
364 ret = do_write(fd, &sz, sizeof(sz));
365 if (ret < 0)
366 return ret;
367
368 evlist__for_each(evlist, evsel) {
369 ret = do_write(fd, &evsel->attr, sz);
370 if (ret < 0)
371 return ret;
372 /*
373 * write number of unique id per event
374 * there is one id per instance of an event
375 *
376 * copy into an nri to be independent of the
377 * type of ids,
378 */
379 nri = evsel->ids;
380 ret = do_write(fd, &nri, sizeof(nri));
381 if (ret < 0)
382 return ret;
383
384 /*
385 * write event string as passed on cmdline
386 */
387 ret = do_write_string(fd, perf_evsel__name(evsel));
388 if (ret < 0)
389 return ret;
390 /*
391 * write unique ids for this event
392 */
393 ret = do_write(fd, evsel->id, evsel->ids * sizeof(u64));
394 if (ret < 0)
395 return ret;
396 }
397 return 0;
398 }
399
400 static int write_cmdline(int fd, struct perf_header *h __maybe_unused,
401 struct perf_evlist *evlist __maybe_unused)
402 {
403 char buf[MAXPATHLEN];
404 char proc[32];
405 u32 i, n;
406 int ret;
407
408 /*
409 * actual atual path to perf binary
410 */
411 sprintf(proc, "/proc/%d/exe", getpid());
412 ret = readlink(proc, buf, sizeof(buf));
413 if (ret <= 0)
414 return -1;
415
416 /* readlink() does not add null termination */
417 buf[ret] = '\0';
418
419 /* account for binary path */
420 n = header_argc + 1;
421
422 ret = do_write(fd, &n, sizeof(n));
423 if (ret < 0)
424 return ret;
425
426 ret = do_write_string(fd, buf);
427 if (ret < 0)
428 return ret;
429
430 for (i = 0 ; i < header_argc; i++) {
431 ret = do_write_string(fd, header_argv[i]);
432 if (ret < 0)
433 return ret;
434 }
435 return 0;
436 }
437
438 #define CORE_SIB_FMT \
439 "/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
440 #define THRD_SIB_FMT \
441 "/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
442
443 struct cpu_topo {
444 u32 core_sib;
445 u32 thread_sib;
446 char **core_siblings;
447 char **thread_siblings;
448 };
449
450 static int build_cpu_topo(struct cpu_topo *tp, int cpu)
451 {
452 FILE *fp;
453 char filename[MAXPATHLEN];
454 char *buf = NULL, *p;
455 size_t len = 0;
456 ssize_t sret;
457 u32 i = 0;
458 int ret = -1;
459
460 sprintf(filename, CORE_SIB_FMT, cpu);
461 fp = fopen(filename, "r");
462 if (!fp)
463 goto try_threads;
464
465 sret = getline(&buf, &len, fp);
466 fclose(fp);
467 if (sret <= 0)
468 goto try_threads;
469
470 p = strchr(buf, '\n');
471 if (p)
472 *p = '\0';
473
474 for (i = 0; i < tp->core_sib; i++) {
475 if (!strcmp(buf, tp->core_siblings[i]))
476 break;
477 }
478 if (i == tp->core_sib) {
479 tp->core_siblings[i] = buf;
480 tp->core_sib++;
481 buf = NULL;
482 len = 0;
483 }
484 ret = 0;
485
486 try_threads:
487 sprintf(filename, THRD_SIB_FMT, cpu);
488 fp = fopen(filename, "r");
489 if (!fp)
490 goto done;
491
492 if (getline(&buf, &len, fp) <= 0)
493 goto done;
494
495 p = strchr(buf, '\n');
496 if (p)
497 *p = '\0';
498
499 for (i = 0; i < tp->thread_sib; i++) {
500 if (!strcmp(buf, tp->thread_siblings[i]))
501 break;
502 }
503 if (i == tp->thread_sib) {
504 tp->thread_siblings[i] = buf;
505 tp->thread_sib++;
506 buf = NULL;
507 }
508 ret = 0;
509 done:
510 if(fp)
511 fclose(fp);
512 free(buf);
513 return ret;
514 }
515
516 static void free_cpu_topo(struct cpu_topo *tp)
517 {
518 u32 i;
519
520 if (!tp)
521 return;
522
523 for (i = 0 ; i < tp->core_sib; i++)
524 zfree(&tp->core_siblings[i]);
525
526 for (i = 0 ; i < tp->thread_sib; i++)
527 zfree(&tp->thread_siblings[i]);
528
529 free(tp);
530 }
531
532 static struct cpu_topo *build_cpu_topology(void)
533 {
534 struct cpu_topo *tp;
535 void *addr;
536 u32 nr, i;
537 size_t sz;
538 long ncpus;
539 int ret = -1;
540
541 ncpus = sysconf(_SC_NPROCESSORS_CONF);
542 if (ncpus < 0)
543 return NULL;
544
545 nr = (u32)(ncpus & UINT_MAX);
546
547 sz = nr * sizeof(char *);
548
549 addr = calloc(1, sizeof(*tp) + 2 * sz);
550 if (!addr)
551 return NULL;
552
553 tp = addr;
554
555 addr += sizeof(*tp);
556 tp->core_siblings = addr;
557 addr += sz;
558 tp->thread_siblings = addr;
559
560 for (i = 0; i < nr; i++) {
561 ret = build_cpu_topo(tp, i);
562 if (ret < 0)
563 break;
564 }
565 if (ret) {
566 free_cpu_topo(tp);
567 tp = NULL;
568 }
569 return tp;
570 }
571
572 static int write_cpu_topology(int fd, struct perf_header *h __maybe_unused,
573 struct perf_evlist *evlist __maybe_unused)
574 {
575 struct cpu_topo *tp;
576 u32 i;
577 int ret;
578
579 tp = build_cpu_topology();
580 if (!tp)
581 return -1;
582
583 ret = do_write(fd, &tp->core_sib, sizeof(tp->core_sib));
584 if (ret < 0)
585 goto done;
586
587 for (i = 0; i < tp->core_sib; i++) {
588 ret = do_write_string(fd, tp->core_siblings[i]);
589 if (ret < 0)
590 goto done;
591 }
592 ret = do_write(fd, &tp->thread_sib, sizeof(tp->thread_sib));
593 if (ret < 0)
594 goto done;
595
596 for (i = 0; i < tp->thread_sib; i++) {
597 ret = do_write_string(fd, tp->thread_siblings[i]);
598 if (ret < 0)
599 break;
600 }
601 done:
602 free_cpu_topo(tp);
603 return ret;
604 }
605
606
607
608 static int write_total_mem(int fd, struct perf_header *h __maybe_unused,
609 struct perf_evlist *evlist __maybe_unused)
610 {
611 char *buf = NULL;
612 FILE *fp;
613 size_t len = 0;
614 int ret = -1, n;
615 uint64_t mem;
616
617 fp = fopen("/proc/meminfo", "r");
618 if (!fp)
619 return -1;
620
621 while (getline(&buf, &len, fp) > 0) {
622 ret = strncmp(buf, "MemTotal:", 9);
623 if (!ret)
624 break;
625 }
626 if (!ret) {
627 n = sscanf(buf, "%*s %"PRIu64, &mem);
628 if (n == 1)
629 ret = do_write(fd, &mem, sizeof(mem));
630 } else
631 ret = -1;
632 free(buf);
633 fclose(fp);
634 return ret;
635 }
636
637 static int write_topo_node(int fd, int node)
638 {
639 char str[MAXPATHLEN];
640 char field[32];
641 char *buf = NULL, *p;
642 size_t len = 0;
643 FILE *fp;
644 u64 mem_total, mem_free, mem;
645 int ret = -1;
646
647 sprintf(str, "/sys/devices/system/node/node%d/meminfo", node);
648 fp = fopen(str, "r");
649 if (!fp)
650 return -1;
651
652 while (getline(&buf, &len, fp) > 0) {
653 /* skip over invalid lines */
654 if (!strchr(buf, ':'))
655 continue;
656 if (sscanf(buf, "%*s %*d %31s %"PRIu64, field, &mem) != 2)
657 goto done;
658 if (!strcmp(field, "MemTotal:"))
659 mem_total = mem;
660 if (!strcmp(field, "MemFree:"))
661 mem_free = mem;
662 }
663
664 fclose(fp);
665 fp = NULL;
666
667 ret = do_write(fd, &mem_total, sizeof(u64));
668 if (ret)
669 goto done;
670
671 ret = do_write(fd, &mem_free, sizeof(u64));
672 if (ret)
673 goto done;
674
675 ret = -1;
676 sprintf(str, "/sys/devices/system/node/node%d/cpulist", node);
677
678 fp = fopen(str, "r");
679 if (!fp)
680 goto done;
681
682 if (getline(&buf, &len, fp) <= 0)
683 goto done;
684
685 p = strchr(buf, '\n');
686 if (p)
687 *p = '\0';
688
689 ret = do_write_string(fd, buf);
690 done:
691 free(buf);
692 if (fp)
693 fclose(fp);
694 return ret;
695 }
696
697 static int write_numa_topology(int fd, struct perf_header *h __maybe_unused,
698 struct perf_evlist *evlist __maybe_unused)
699 {
700 char *buf = NULL;
701 size_t len = 0;
702 FILE *fp;
703 struct cpu_map *node_map = NULL;
704 char *c;
705 u32 nr, i, j;
706 int ret = -1;
707
708 fp = fopen("/sys/devices/system/node/online", "r");
709 if (!fp)
710 return -1;
711
712 if (getline(&buf, &len, fp) <= 0)
713 goto done;
714
715 c = strchr(buf, '\n');
716 if (c)
717 *c = '\0';
718
719 node_map = cpu_map__new(buf);
720 if (!node_map)
721 goto done;
722
723 nr = (u32)node_map->nr;
724
725 ret = do_write(fd, &nr, sizeof(nr));
726 if (ret < 0)
727 goto done;
728
729 for (i = 0; i < nr; i++) {
730 j = (u32)node_map->map[i];
731 ret = do_write(fd, &j, sizeof(j));
732 if (ret < 0)
733 break;
734
735 ret = write_topo_node(fd, i);
736 if (ret < 0)
737 break;
738 }
739 done:
740 free(buf);
741 fclose(fp);
742 free(node_map);
743 return ret;
744 }
745
746 /*
747 * File format:
748 *
749 * struct pmu_mappings {
750 * u32 pmu_num;
751 * struct pmu_map {
752 * u32 type;
753 * char name[];
754 * }[pmu_num];
755 * };
756 */
757
758 static int write_pmu_mappings(int fd, struct perf_header *h __maybe_unused,
759 struct perf_evlist *evlist __maybe_unused)
760 {
761 struct perf_pmu *pmu = NULL;
762 off_t offset = lseek(fd, 0, SEEK_CUR);
763 __u32 pmu_num = 0;
764 int ret;
765
766 /* write real pmu_num later */
767 ret = do_write(fd, &pmu_num, sizeof(pmu_num));
768 if (ret < 0)
769 return ret;
770
771 while ((pmu = perf_pmu__scan(pmu))) {
772 if (!pmu->name)
773 continue;
774 pmu_num++;
775
776 ret = do_write(fd, &pmu->type, sizeof(pmu->type));
777 if (ret < 0)
778 return ret;
779
780 ret = do_write_string(fd, pmu->name);
781 if (ret < 0)
782 return ret;
783 }
784
785 if (pwrite(fd, &pmu_num, sizeof(pmu_num), offset) != sizeof(pmu_num)) {
786 /* discard all */
787 lseek(fd, offset, SEEK_SET);
788 return -1;
789 }
790
791 return 0;
792 }
793
794 /*
795 * File format:
796 *
797 * struct group_descs {
798 * u32 nr_groups;
799 * struct group_desc {
800 * char name[];
801 * u32 leader_idx;
802 * u32 nr_members;
803 * }[nr_groups];
804 * };
805 */
806 static int write_group_desc(int fd, struct perf_header *h __maybe_unused,
807 struct perf_evlist *evlist)
808 {
809 u32 nr_groups = evlist->nr_groups;
810 struct perf_evsel *evsel;
811 int ret;
812
813 ret = do_write(fd, &nr_groups, sizeof(nr_groups));
814 if (ret < 0)
815 return ret;
816
817 evlist__for_each(evlist, evsel) {
818 if (perf_evsel__is_group_leader(evsel) &&
819 evsel->nr_members > 1) {
820 const char *name = evsel->group_name ?: "{anon_group}";
821 u32 leader_idx = evsel->idx;
822 u32 nr_members = evsel->nr_members;
823
824 ret = do_write_string(fd, name);
825 if (ret < 0)
826 return ret;
827
828 ret = do_write(fd, &leader_idx, sizeof(leader_idx));
829 if (ret < 0)
830 return ret;
831
832 ret = do_write(fd, &nr_members, sizeof(nr_members));
833 if (ret < 0)
834 return ret;
835 }
836 }
837 return 0;
838 }
839
840 /*
841 * default get_cpuid(): nothing gets recorded
842 * actual implementation must be in arch/$(ARCH)/util/header.c
843 */
844 int __attribute__ ((weak)) get_cpuid(char *buffer __maybe_unused,
845 size_t sz __maybe_unused)
846 {
847 return -1;
848 }
849
850 static int write_cpuid(int fd, struct perf_header *h __maybe_unused,
851 struct perf_evlist *evlist __maybe_unused)
852 {
853 char buffer[64];
854 int ret;
855
856 ret = get_cpuid(buffer, sizeof(buffer));
857 if (!ret)
858 goto write_it;
859
860 return -1;
861 write_it:
862 return do_write_string(fd, buffer);
863 }
864
865 static int write_branch_stack(int fd __maybe_unused,
866 struct perf_header *h __maybe_unused,
867 struct perf_evlist *evlist __maybe_unused)
868 {
869 return 0;
870 }
871
872 static void print_hostname(struct perf_header *ph, int fd __maybe_unused,
873 FILE *fp)
874 {
875 fprintf(fp, "# hostname : %s\n", ph->env.hostname);
876 }
877
878 static void print_osrelease(struct perf_header *ph, int fd __maybe_unused,
879 FILE *fp)
880 {
881 fprintf(fp, "# os release : %s\n", ph->env.os_release);
882 }
883
884 static void print_arch(struct perf_header *ph, int fd __maybe_unused, FILE *fp)
885 {
886 fprintf(fp, "# arch : %s\n", ph->env.arch);
887 }
888
889 static void print_cpudesc(struct perf_header *ph, int fd __maybe_unused,
890 FILE *fp)
891 {
892 fprintf(fp, "# cpudesc : %s\n", ph->env.cpu_desc);
893 }
894
895 static void print_nrcpus(struct perf_header *ph, int fd __maybe_unused,
896 FILE *fp)
897 {
898 fprintf(fp, "# nrcpus online : %u\n", ph->env.nr_cpus_online);
899 fprintf(fp, "# nrcpus avail : %u\n", ph->env.nr_cpus_avail);
900 }
901
902 static void print_version(struct perf_header *ph, int fd __maybe_unused,
903 FILE *fp)
904 {
905 fprintf(fp, "# perf version : %s\n", ph->env.version);
906 }
907
908 static void print_cmdline(struct perf_header *ph, int fd __maybe_unused,
909 FILE *fp)
910 {
911 int nr, i;
912 char *str;
913
914 nr = ph->env.nr_cmdline;
915 str = ph->env.cmdline;
916
917 fprintf(fp, "# cmdline : ");
918
919 for (i = 0; i < nr; i++) {
920 fprintf(fp, "%s ", str);
921 str += strlen(str) + 1;
922 }
923 fputc('\n', fp);
924 }
925
926 static void print_cpu_topology(struct perf_header *ph, int fd __maybe_unused,
927 FILE *fp)
928 {
929 int nr, i;
930 char *str;
931
932 nr = ph->env.nr_sibling_cores;
933 str = ph->env.sibling_cores;
934
935 for (i = 0; i < nr; i++) {
936 fprintf(fp, "# sibling cores : %s\n", str);
937 str += strlen(str) + 1;
938 }
939
940 nr = ph->env.nr_sibling_threads;
941 str = ph->env.sibling_threads;
942
943 for (i = 0; i < nr; i++) {
944 fprintf(fp, "# sibling threads : %s\n", str);
945 str += strlen(str) + 1;
946 }
947 }
948
949 static void free_event_desc(struct perf_evsel *events)
950 {
951 struct perf_evsel *evsel;
952
953 if (!events)
954 return;
955
956 for (evsel = events; evsel->attr.size; evsel++) {
957 zfree(&evsel->name);
958 zfree(&evsel->id);
959 }
960
961 free(events);
962 }
963
964 static struct perf_evsel *
965 read_event_desc(struct perf_header *ph, int fd)
966 {
967 struct perf_evsel *evsel, *events = NULL;
968 u64 *id;
969 void *buf = NULL;
970 u32 nre, sz, nr, i, j;
971 ssize_t ret;
972 size_t msz;
973
974 /* number of events */
975 ret = readn(fd, &nre, sizeof(nre));
976 if (ret != (ssize_t)sizeof(nre))
977 goto error;
978
979 if (ph->needs_swap)
980 nre = bswap_32(nre);
981
982 ret = readn(fd, &sz, sizeof(sz));
983 if (ret != (ssize_t)sizeof(sz))
984 goto error;
985
986 if (ph->needs_swap)
987 sz = bswap_32(sz);
988
989 /* buffer to hold on file attr struct */
990 buf = malloc(sz);
991 if (!buf)
992 goto error;
993
994 /* the last event terminates with evsel->attr.size == 0: */
995 events = calloc(nre + 1, sizeof(*events));
996 if (!events)
997 goto error;
998
999 msz = sizeof(evsel->attr);
1000 if (sz < msz)
1001 msz = sz;
1002
1003 for (i = 0, evsel = events; i < nre; evsel++, i++) {
1004 evsel->idx = i;
1005
1006 /*
1007 * must read entire on-file attr struct to
1008 * sync up with layout.
1009 */
1010 ret = readn(fd, buf, sz);
1011 if (ret != (ssize_t)sz)
1012 goto error;
1013
1014 if (ph->needs_swap)
1015 perf_event__attr_swap(buf);
1016
1017 memcpy(&evsel->attr, buf, msz);
1018
1019 ret = readn(fd, &nr, sizeof(nr));
1020 if (ret != (ssize_t)sizeof(nr))
1021 goto error;
1022
1023 if (ph->needs_swap) {
1024 nr = bswap_32(nr);
1025 evsel->needs_swap = true;
1026 }
1027
1028 evsel->name = do_read_string(fd, ph);
1029
1030 if (!nr)
1031 continue;
1032
1033 id = calloc(nr, sizeof(*id));
1034 if (!id)
1035 goto error;
1036 evsel->ids = nr;
1037 evsel->id = id;
1038
1039 for (j = 0 ; j < nr; j++) {
1040 ret = readn(fd, id, sizeof(*id));
1041 if (ret != (ssize_t)sizeof(*id))
1042 goto error;
1043 if (ph->needs_swap)
1044 *id = bswap_64(*id);
1045 id++;
1046 }
1047 }
1048 out:
1049 free(buf);
1050 return events;
1051 error:
1052 if (events)
1053 free_event_desc(events);
1054 events = NULL;
1055 goto out;
1056 }
1057
1058 static void print_event_desc(struct perf_header *ph, int fd, FILE *fp)
1059 {
1060 struct perf_evsel *evsel, *events = read_event_desc(ph, fd);
1061 u32 j;
1062 u64 *id;
1063
1064 if (!events) {
1065 fprintf(fp, "# event desc: not available or unable to read\n");
1066 return;
1067 }
1068
1069 for (evsel = events; evsel->attr.size; evsel++) {
1070 fprintf(fp, "# event : name = %s, ", evsel->name);
1071
1072 fprintf(fp, "type = %d, config = 0x%"PRIx64
1073 ", config1 = 0x%"PRIx64", config2 = 0x%"PRIx64,
1074 evsel->attr.type,
1075 (u64)evsel->attr.config,
1076 (u64)evsel->attr.config1,
1077 (u64)evsel->attr.config2);
1078
1079 fprintf(fp, ", excl_usr = %d, excl_kern = %d",
1080 evsel->attr.exclude_user,
1081 evsel->attr.exclude_kernel);
1082
1083 fprintf(fp, ", excl_host = %d, excl_guest = %d",
1084 evsel->attr.exclude_host,
1085 evsel->attr.exclude_guest);
1086
1087 fprintf(fp, ", precise_ip = %d", evsel->attr.precise_ip);
1088
1089 fprintf(fp, ", attr_mmap2 = %d", evsel->attr.mmap2);
1090 fprintf(fp, ", attr_mmap = %d", evsel->attr.mmap);
1091 fprintf(fp, ", attr_mmap_data = %d", evsel->attr.mmap_data);
1092 if (evsel->ids) {
1093 fprintf(fp, ", id = {");
1094 for (j = 0, id = evsel->id; j < evsel->ids; j++, id++) {
1095 if (j)
1096 fputc(',', fp);
1097 fprintf(fp, " %"PRIu64, *id);
1098 }
1099 fprintf(fp, " }");
1100 }
1101
1102 fputc('\n', fp);
1103 }
1104
1105 free_event_desc(events);
1106 }
1107
1108 static void print_total_mem(struct perf_header *ph, int fd __maybe_unused,
1109 FILE *fp)
1110 {
1111 fprintf(fp, "# total memory : %Lu kB\n", ph->env.total_mem);
1112 }
1113
1114 static void print_numa_topology(struct perf_header *ph, int fd __maybe_unused,
1115 FILE *fp)
1116 {
1117 u32 nr, c, i;
1118 char *str, *tmp;
1119 uint64_t mem_total, mem_free;
1120
1121 /* nr nodes */
1122 nr = ph->env.nr_numa_nodes;
1123 str = ph->env.numa_nodes;
1124
1125 for (i = 0; i < nr; i++) {
1126 /* node number */
1127 c = strtoul(str, &tmp, 0);
1128 if (*tmp != ':')
1129 goto error;
1130
1131 str = tmp + 1;
1132 mem_total = strtoull(str, &tmp, 0);
1133 if (*tmp != ':')
1134 goto error;
1135
1136 str = tmp + 1;
1137 mem_free = strtoull(str, &tmp, 0);
1138 if (*tmp != ':')
1139 goto error;
1140
1141 fprintf(fp, "# node%u meminfo : total = %"PRIu64" kB,"
1142 " free = %"PRIu64" kB\n",
1143 c, mem_total, mem_free);
1144
1145 str = tmp + 1;
1146 fprintf(fp, "# node%u cpu list : %s\n", c, str);
1147
1148 str += strlen(str) + 1;
1149 }
1150 return;
1151 error:
1152 fprintf(fp, "# numa topology : not available\n");
1153 }
1154
1155 static void print_cpuid(struct perf_header *ph, int fd __maybe_unused, FILE *fp)
1156 {
1157 fprintf(fp, "# cpuid : %s\n", ph->env.cpuid);
1158 }
1159
1160 static void print_branch_stack(struct perf_header *ph __maybe_unused,
1161 int fd __maybe_unused, FILE *fp)
1162 {
1163 fprintf(fp, "# contains samples with branch stack\n");
1164 }
1165
1166 static void print_pmu_mappings(struct perf_header *ph, int fd __maybe_unused,
1167 FILE *fp)
1168 {
1169 const char *delimiter = "# pmu mappings: ";
1170 char *str, *tmp;
1171 u32 pmu_num;
1172 u32 type;
1173
1174 pmu_num = ph->env.nr_pmu_mappings;
1175 if (!pmu_num) {
1176 fprintf(fp, "# pmu mappings: not available\n");
1177 return;
1178 }
1179
1180 str = ph->env.pmu_mappings;
1181
1182 while (pmu_num) {
1183 type = strtoul(str, &tmp, 0);
1184 if (*tmp != ':')
1185 goto error;
1186
1187 str = tmp + 1;
1188 fprintf(fp, "%s%s = %" PRIu32, delimiter, str, type);
1189
1190 delimiter = ", ";
1191 str += strlen(str) + 1;
1192 pmu_num--;
1193 }
1194
1195 fprintf(fp, "\n");
1196
1197 if (!pmu_num)
1198 return;
1199 error:
1200 fprintf(fp, "# pmu mappings: unable to read\n");
1201 }
1202
1203 static void print_group_desc(struct perf_header *ph, int fd __maybe_unused,
1204 FILE *fp)
1205 {
1206 struct perf_session *session;
1207 struct perf_evsel *evsel;
1208 u32 nr = 0;
1209
1210 session = container_of(ph, struct perf_session, header);
1211
1212 evlist__for_each(session->evlist, evsel) {
1213 if (perf_evsel__is_group_leader(evsel) &&
1214 evsel->nr_members > 1) {
1215 fprintf(fp, "# group: %s{%s", evsel->group_name ?: "",
1216 perf_evsel__name(evsel));
1217
1218 nr = evsel->nr_members - 1;
1219 } else if (nr) {
1220 fprintf(fp, ",%s", perf_evsel__name(evsel));
1221
1222 if (--nr == 0)
1223 fprintf(fp, "}\n");
1224 }
1225 }
1226 }
1227
1228 static int __event_process_build_id(struct build_id_event *bev,
1229 char *filename,
1230 struct perf_session *session)
1231 {
1232 int err = -1;
1233 struct dsos *dsos;
1234 struct machine *machine;
1235 u16 misc;
1236 struct dso *dso;
1237 enum dso_kernel_type dso_type;
1238
1239 machine = perf_session__findnew_machine(session, bev->pid);
1240 if (!machine)
1241 goto out;
1242
1243 misc = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1244
1245 switch (misc) {
1246 case PERF_RECORD_MISC_KERNEL:
1247 dso_type = DSO_TYPE_KERNEL;
1248 dsos = &machine->kernel_dsos;
1249 break;
1250 case PERF_RECORD_MISC_GUEST_KERNEL:
1251 dso_type = DSO_TYPE_GUEST_KERNEL;
1252 dsos = &machine->kernel_dsos;
1253 break;
1254 case PERF_RECORD_MISC_USER:
1255 case PERF_RECORD_MISC_GUEST_USER:
1256 dso_type = DSO_TYPE_USER;
1257 dsos = &machine->user_dsos;
1258 break;
1259 default:
1260 goto out;
1261 }
1262
1263 dso = __dsos__findnew(dsos, filename);
1264 if (dso != NULL) {
1265 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1266
1267 dso__set_build_id(dso, &bev->build_id);
1268
1269 if (!is_kernel_module(filename, NULL))
1270 dso->kernel = dso_type;
1271
1272 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
1273 sbuild_id);
1274 pr_debug("build id event received for %s: %s\n",
1275 dso->long_name, sbuild_id);
1276 }
1277
1278 err = 0;
1279 out:
1280 return err;
1281 }
1282
1283 static int perf_header__read_build_ids_abi_quirk(struct perf_header *header,
1284 int input, u64 offset, u64 size)
1285 {
1286 struct perf_session *session = container_of(header, struct perf_session, header);
1287 struct {
1288 struct perf_event_header header;
1289 u8 build_id[PERF_ALIGN(BUILD_ID_SIZE, sizeof(u64))];
1290 char filename[0];
1291 } old_bev;
1292 struct build_id_event bev;
1293 char filename[PATH_MAX];
1294 u64 limit = offset + size;
1295
1296 while (offset < limit) {
1297 ssize_t len;
1298
1299 if (readn(input, &old_bev, sizeof(old_bev)) != sizeof(old_bev))
1300 return -1;
1301
1302 if (header->needs_swap)
1303 perf_event_header__bswap(&old_bev.header);
1304
1305 len = old_bev.header.size - sizeof(old_bev);
1306 if (readn(input, filename, len) != len)
1307 return -1;
1308
1309 bev.header = old_bev.header;
1310
1311 /*
1312 * As the pid is the missing value, we need to fill
1313 * it properly. The header.misc value give us nice hint.
1314 */
1315 bev.pid = HOST_KERNEL_ID;
1316 if (bev.header.misc == PERF_RECORD_MISC_GUEST_USER ||
1317 bev.header.misc == PERF_RECORD_MISC_GUEST_KERNEL)
1318 bev.pid = DEFAULT_GUEST_KERNEL_ID;
1319
1320 memcpy(bev.build_id, old_bev.build_id, sizeof(bev.build_id));
1321 __event_process_build_id(&bev, filename, session);
1322
1323 offset += bev.header.size;
1324 }
1325
1326 return 0;
1327 }
1328
1329 static int perf_header__read_build_ids(struct perf_header *header,
1330 int input, u64 offset, u64 size)
1331 {
1332 struct perf_session *session = container_of(header, struct perf_session, header);
1333 struct build_id_event bev;
1334 char filename[PATH_MAX];
1335 u64 limit = offset + size, orig_offset = offset;
1336 int err = -1;
1337
1338 while (offset < limit) {
1339 ssize_t len;
1340
1341 if (readn(input, &bev, sizeof(bev)) != sizeof(bev))
1342 goto out;
1343
1344 if (header->needs_swap)
1345 perf_event_header__bswap(&bev.header);
1346
1347 len = bev.header.size - sizeof(bev);
1348 if (readn(input, filename, len) != len)
1349 goto out;
1350 /*
1351 * The a1645ce1 changeset:
1352 *
1353 * "perf: 'perf kvm' tool for monitoring guest performance from host"
1354 *
1355 * Added a field to struct build_id_event that broke the file
1356 * format.
1357 *
1358 * Since the kernel build-id is the first entry, process the
1359 * table using the old format if the well known
1360 * '[kernel.kallsyms]' string for the kernel build-id has the
1361 * first 4 characters chopped off (where the pid_t sits).
1362 */
1363 if (memcmp(filename, "nel.kallsyms]", 13) == 0) {
1364 if (lseek(input, orig_offset, SEEK_SET) == (off_t)-1)
1365 return -1;
1366 return perf_header__read_build_ids_abi_quirk(header, input, offset, size);
1367 }
1368
1369 __event_process_build_id(&bev, filename, session);
1370
1371 offset += bev.header.size;
1372 }
1373 err = 0;
1374 out:
1375 return err;
1376 }
1377
1378 static int process_tracing_data(struct perf_file_section *section __maybe_unused,
1379 struct perf_header *ph __maybe_unused,
1380 int fd, void *data)
1381 {
1382 ssize_t ret = trace_report(fd, data, false);
1383 return ret < 0 ? -1 : 0;
1384 }
1385
1386 static int process_build_id(struct perf_file_section *section,
1387 struct perf_header *ph, int fd,
1388 void *data __maybe_unused)
1389 {
1390 if (perf_header__read_build_ids(ph, fd, section->offset, section->size))
1391 pr_debug("Failed to read buildids, continuing...\n");
1392 return 0;
1393 }
1394
1395 static int process_hostname(struct perf_file_section *section __maybe_unused,
1396 struct perf_header *ph, int fd,
1397 void *data __maybe_unused)
1398 {
1399 ph->env.hostname = do_read_string(fd, ph);
1400 return ph->env.hostname ? 0 : -ENOMEM;
1401 }
1402
1403 static int process_osrelease(struct perf_file_section *section __maybe_unused,
1404 struct perf_header *ph, int fd,
1405 void *data __maybe_unused)
1406 {
1407 ph->env.os_release = do_read_string(fd, ph);
1408 return ph->env.os_release ? 0 : -ENOMEM;
1409 }
1410
1411 static int process_version(struct perf_file_section *section __maybe_unused,
1412 struct perf_header *ph, int fd,
1413 void *data __maybe_unused)
1414 {
1415 ph->env.version = do_read_string(fd, ph);
1416 return ph->env.version ? 0 : -ENOMEM;
1417 }
1418
1419 static int process_arch(struct perf_file_section *section __maybe_unused,
1420 struct perf_header *ph, int fd,
1421 void *data __maybe_unused)
1422 {
1423 ph->env.arch = do_read_string(fd, ph);
1424 return ph->env.arch ? 0 : -ENOMEM;
1425 }
1426
1427 static int process_nrcpus(struct perf_file_section *section __maybe_unused,
1428 struct perf_header *ph, int fd,
1429 void *data __maybe_unused)
1430 {
1431 ssize_t ret;
1432 u32 nr;
1433
1434 ret = readn(fd, &nr, sizeof(nr));
1435 if (ret != sizeof(nr))
1436 return -1;
1437
1438 if (ph->needs_swap)
1439 nr = bswap_32(nr);
1440
1441 ph->env.nr_cpus_online = nr;
1442
1443 ret = readn(fd, &nr, sizeof(nr));
1444 if (ret != sizeof(nr))
1445 return -1;
1446
1447 if (ph->needs_swap)
1448 nr = bswap_32(nr);
1449
1450 ph->env.nr_cpus_avail = nr;
1451 return 0;
1452 }
1453
1454 static int process_cpudesc(struct perf_file_section *section __maybe_unused,
1455 struct perf_header *ph, int fd,
1456 void *data __maybe_unused)
1457 {
1458 ph->env.cpu_desc = do_read_string(fd, ph);
1459 return ph->env.cpu_desc ? 0 : -ENOMEM;
1460 }
1461
1462 static int process_cpuid(struct perf_file_section *section __maybe_unused,
1463 struct perf_header *ph, int fd,
1464 void *data __maybe_unused)
1465 {
1466 ph->env.cpuid = do_read_string(fd, ph);
1467 return ph->env.cpuid ? 0 : -ENOMEM;
1468 }
1469
1470 static int process_total_mem(struct perf_file_section *section __maybe_unused,
1471 struct perf_header *ph, int fd,
1472 void *data __maybe_unused)
1473 {
1474 uint64_t mem;
1475 ssize_t ret;
1476
1477 ret = readn(fd, &mem, sizeof(mem));
1478 if (ret != sizeof(mem))
1479 return -1;
1480
1481 if (ph->needs_swap)
1482 mem = bswap_64(mem);
1483
1484 ph->env.total_mem = mem;
1485 return 0;
1486 }
1487
1488 static struct perf_evsel *
1489 perf_evlist__find_by_index(struct perf_evlist *evlist, int idx)
1490 {
1491 struct perf_evsel *evsel;
1492
1493 evlist__for_each(evlist, evsel) {
1494 if (evsel->idx == idx)
1495 return evsel;
1496 }
1497
1498 return NULL;
1499 }
1500
1501 static void
1502 perf_evlist__set_event_name(struct perf_evlist *evlist,
1503 struct perf_evsel *event)
1504 {
1505 struct perf_evsel *evsel;
1506
1507 if (!event->name)
1508 return;
1509
1510 evsel = perf_evlist__find_by_index(evlist, event->idx);
1511 if (!evsel)
1512 return;
1513
1514 if (evsel->name)
1515 return;
1516
1517 evsel->name = strdup(event->name);
1518 }
1519
1520 static int
1521 process_event_desc(struct perf_file_section *section __maybe_unused,
1522 struct perf_header *header, int fd,
1523 void *data __maybe_unused)
1524 {
1525 struct perf_session *session;
1526 struct perf_evsel *evsel, *events = read_event_desc(header, fd);
1527
1528 if (!events)
1529 return 0;
1530
1531 session = container_of(header, struct perf_session, header);
1532 for (evsel = events; evsel->attr.size; evsel++)
1533 perf_evlist__set_event_name(session->evlist, evsel);
1534
1535 free_event_desc(events);
1536
1537 return 0;
1538 }
1539
1540 static int process_cmdline(struct perf_file_section *section __maybe_unused,
1541 struct perf_header *ph, int fd,
1542 void *data __maybe_unused)
1543 {
1544 ssize_t ret;
1545 char *str;
1546 u32 nr, i;
1547 struct strbuf sb;
1548
1549 ret = readn(fd, &nr, sizeof(nr));
1550 if (ret != sizeof(nr))
1551 return -1;
1552
1553 if (ph->needs_swap)
1554 nr = bswap_32(nr);
1555
1556 ph->env.nr_cmdline = nr;
1557 strbuf_init(&sb, 128);
1558
1559 for (i = 0; i < nr; i++) {
1560 str = do_read_string(fd, ph);
1561 if (!str)
1562 goto error;
1563
1564 /* include a NULL character at the end */
1565 strbuf_add(&sb, str, strlen(str) + 1);
1566 free(str);
1567 }
1568 ph->env.cmdline = strbuf_detach(&sb, NULL);
1569 return 0;
1570
1571 error:
1572 strbuf_release(&sb);
1573 return -1;
1574 }
1575
1576 static int process_cpu_topology(struct perf_file_section *section __maybe_unused,
1577 struct perf_header *ph, int fd,
1578 void *data __maybe_unused)
1579 {
1580 ssize_t ret;
1581 u32 nr, i;
1582 char *str;
1583 struct strbuf sb;
1584
1585 ret = readn(fd, &nr, sizeof(nr));
1586 if (ret != sizeof(nr))
1587 return -1;
1588
1589 if (ph->needs_swap)
1590 nr = bswap_32(nr);
1591
1592 ph->env.nr_sibling_cores = nr;
1593 strbuf_init(&sb, 128);
1594
1595 for (i = 0; i < nr; i++) {
1596 str = do_read_string(fd, ph);
1597 if (!str)
1598 goto error;
1599
1600 /* include a NULL character at the end */
1601 strbuf_add(&sb, str, strlen(str) + 1);
1602 free(str);
1603 }
1604 ph->env.sibling_cores = strbuf_detach(&sb, NULL);
1605
1606 ret = readn(fd, &nr, sizeof(nr));
1607 if (ret != sizeof(nr))
1608 return -1;
1609
1610 if (ph->needs_swap)
1611 nr = bswap_32(nr);
1612
1613 ph->env.nr_sibling_threads = nr;
1614
1615 for (i = 0; i < nr; i++) {
1616 str = do_read_string(fd, ph);
1617 if (!str)
1618 goto error;
1619
1620 /* include a NULL character at the end */
1621 strbuf_add(&sb, str, strlen(str) + 1);
1622 free(str);
1623 }
1624 ph->env.sibling_threads = strbuf_detach(&sb, NULL);
1625 return 0;
1626
1627 error:
1628 strbuf_release(&sb);
1629 return -1;
1630 }
1631
1632 static int process_numa_topology(struct perf_file_section *section __maybe_unused,
1633 struct perf_header *ph, int fd,
1634 void *data __maybe_unused)
1635 {
1636 ssize_t ret;
1637 u32 nr, node, i;
1638 char *str;
1639 uint64_t mem_total, mem_free;
1640 struct strbuf sb;
1641
1642 /* nr nodes */
1643 ret = readn(fd, &nr, sizeof(nr));
1644 if (ret != sizeof(nr))
1645 goto error;
1646
1647 if (ph->needs_swap)
1648 nr = bswap_32(nr);
1649
1650 ph->env.nr_numa_nodes = nr;
1651 strbuf_init(&sb, 256);
1652
1653 for (i = 0; i < nr; i++) {
1654 /* node number */
1655 ret = readn(fd, &node, sizeof(node));
1656 if (ret != sizeof(node))
1657 goto error;
1658
1659 ret = readn(fd, &mem_total, sizeof(u64));
1660 if (ret != sizeof(u64))
1661 goto error;
1662
1663 ret = readn(fd, &mem_free, sizeof(u64));
1664 if (ret != sizeof(u64))
1665 goto error;
1666
1667 if (ph->needs_swap) {
1668 node = bswap_32(node);
1669 mem_total = bswap_64(mem_total);
1670 mem_free = bswap_64(mem_free);
1671 }
1672
1673 strbuf_addf(&sb, "%u:%"PRIu64":%"PRIu64":",
1674 node, mem_total, mem_free);
1675
1676 str = do_read_string(fd, ph);
1677 if (!str)
1678 goto error;
1679
1680 /* include a NULL character at the end */
1681 strbuf_add(&sb, str, strlen(str) + 1);
1682 free(str);
1683 }
1684 ph->env.numa_nodes = strbuf_detach(&sb, NULL);
1685 return 0;
1686
1687 error:
1688 strbuf_release(&sb);
1689 return -1;
1690 }
1691
1692 static int process_pmu_mappings(struct perf_file_section *section __maybe_unused,
1693 struct perf_header *ph, int fd,
1694 void *data __maybe_unused)
1695 {
1696 ssize_t ret;
1697 char *name;
1698 u32 pmu_num;
1699 u32 type;
1700 struct strbuf sb;
1701
1702 ret = readn(fd, &pmu_num, sizeof(pmu_num));
1703 if (ret != sizeof(pmu_num))
1704 return -1;
1705
1706 if (ph->needs_swap)
1707 pmu_num = bswap_32(pmu_num);
1708
1709 if (!pmu_num) {
1710 pr_debug("pmu mappings not available\n");
1711 return 0;
1712 }
1713
1714 ph->env.nr_pmu_mappings = pmu_num;
1715 strbuf_init(&sb, 128);
1716
1717 while (pmu_num) {
1718 if (readn(fd, &type, sizeof(type)) != sizeof(type))
1719 goto error;
1720 if (ph->needs_swap)
1721 type = bswap_32(type);
1722
1723 name = do_read_string(fd, ph);
1724 if (!name)
1725 goto error;
1726
1727 strbuf_addf(&sb, "%u:%s", type, name);
1728 /* include a NULL character at the end */
1729 strbuf_add(&sb, "", 1);
1730
1731 free(name);
1732 pmu_num--;
1733 }
1734 ph->env.pmu_mappings = strbuf_detach(&sb, NULL);
1735 return 0;
1736
1737 error:
1738 strbuf_release(&sb);
1739 return -1;
1740 }
1741
1742 static int process_group_desc(struct perf_file_section *section __maybe_unused,
1743 struct perf_header *ph, int fd,
1744 void *data __maybe_unused)
1745 {
1746 size_t ret = -1;
1747 u32 i, nr, nr_groups;
1748 struct perf_session *session;
1749 struct perf_evsel *evsel, *leader = NULL;
1750 struct group_desc {
1751 char *name;
1752 u32 leader_idx;
1753 u32 nr_members;
1754 } *desc;
1755
1756 if (readn(fd, &nr_groups, sizeof(nr_groups)) != sizeof(nr_groups))
1757 return -1;
1758
1759 if (ph->needs_swap)
1760 nr_groups = bswap_32(nr_groups);
1761
1762 ph->env.nr_groups = nr_groups;
1763 if (!nr_groups) {
1764 pr_debug("group desc not available\n");
1765 return 0;
1766 }
1767
1768 desc = calloc(nr_groups, sizeof(*desc));
1769 if (!desc)
1770 return -1;
1771
1772 for (i = 0; i < nr_groups; i++) {
1773 desc[i].name = do_read_string(fd, ph);
1774 if (!desc[i].name)
1775 goto out_free;
1776
1777 if (readn(fd, &desc[i].leader_idx, sizeof(u32)) != sizeof(u32))
1778 goto out_free;
1779
1780 if (readn(fd, &desc[i].nr_members, sizeof(u32)) != sizeof(u32))
1781 goto out_free;
1782
1783 if (ph->needs_swap) {
1784 desc[i].leader_idx = bswap_32(desc[i].leader_idx);
1785 desc[i].nr_members = bswap_32(desc[i].nr_members);
1786 }
1787 }
1788
1789 /*
1790 * Rebuild group relationship based on the group_desc
1791 */
1792 session = container_of(ph, struct perf_session, header);
1793 session->evlist->nr_groups = nr_groups;
1794
1795 i = nr = 0;
1796 evlist__for_each(session->evlist, evsel) {
1797 if (evsel->idx == (int) desc[i].leader_idx) {
1798 evsel->leader = evsel;
1799 /* {anon_group} is a dummy name */
1800 if (strcmp(desc[i].name, "{anon_group}")) {
1801 evsel->group_name = desc[i].name;
1802 desc[i].name = NULL;
1803 }
1804 evsel->nr_members = desc[i].nr_members;
1805
1806 if (i >= nr_groups || nr > 0) {
1807 pr_debug("invalid group desc\n");
1808 goto out_free;
1809 }
1810
1811 leader = evsel;
1812 nr = evsel->nr_members - 1;
1813 i++;
1814 } else if (nr) {
1815 /* This is a group member */
1816 evsel->leader = leader;
1817
1818 nr--;
1819 }
1820 }
1821
1822 if (i != nr_groups || nr != 0) {
1823 pr_debug("invalid group desc\n");
1824 goto out_free;
1825 }
1826
1827 ret = 0;
1828 out_free:
1829 for (i = 0; i < nr_groups; i++)
1830 zfree(&desc[i].name);
1831 free(desc);
1832
1833 return ret;
1834 }
1835
1836 struct feature_ops {
1837 int (*write)(int fd, struct perf_header *h, struct perf_evlist *evlist);
1838 void (*print)(struct perf_header *h, int fd, FILE *fp);
1839 int (*process)(struct perf_file_section *section,
1840 struct perf_header *h, int fd, void *data);
1841 const char *name;
1842 bool full_only;
1843 };
1844
1845 #define FEAT_OPA(n, func) \
1846 [n] = { .name = #n, .write = write_##func, .print = print_##func }
1847 #define FEAT_OPP(n, func) \
1848 [n] = { .name = #n, .write = write_##func, .print = print_##func, \
1849 .process = process_##func }
1850 #define FEAT_OPF(n, func) \
1851 [n] = { .name = #n, .write = write_##func, .print = print_##func, \
1852 .process = process_##func, .full_only = true }
1853
1854 /* feature_ops not implemented: */
1855 #define print_tracing_data NULL
1856 #define print_build_id NULL
1857
1858 static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
1859 FEAT_OPP(HEADER_TRACING_DATA, tracing_data),
1860 FEAT_OPP(HEADER_BUILD_ID, build_id),
1861 FEAT_OPP(HEADER_HOSTNAME, hostname),
1862 FEAT_OPP(HEADER_OSRELEASE, osrelease),
1863 FEAT_OPP(HEADER_VERSION, version),
1864 FEAT_OPP(HEADER_ARCH, arch),
1865 FEAT_OPP(HEADER_NRCPUS, nrcpus),
1866 FEAT_OPP(HEADER_CPUDESC, cpudesc),
1867 FEAT_OPP(HEADER_CPUID, cpuid),
1868 FEAT_OPP(HEADER_TOTAL_MEM, total_mem),
1869 FEAT_OPP(HEADER_EVENT_DESC, event_desc),
1870 FEAT_OPP(HEADER_CMDLINE, cmdline),
1871 FEAT_OPF(HEADER_CPU_TOPOLOGY, cpu_topology),
1872 FEAT_OPF(HEADER_NUMA_TOPOLOGY, numa_topology),
1873 FEAT_OPA(HEADER_BRANCH_STACK, branch_stack),
1874 FEAT_OPP(HEADER_PMU_MAPPINGS, pmu_mappings),
1875 FEAT_OPP(HEADER_GROUP_DESC, group_desc),
1876 };
1877
1878 struct header_print_data {
1879 FILE *fp;
1880 bool full; /* extended list of headers */
1881 };
1882
1883 static int perf_file_section__fprintf_info(struct perf_file_section *section,
1884 struct perf_header *ph,
1885 int feat, int fd, void *data)
1886 {
1887 struct header_print_data *hd = data;
1888
1889 if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
1890 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
1891 "%d, continuing...\n", section->offset, feat);
1892 return 0;
1893 }
1894 if (feat >= HEADER_LAST_FEATURE) {
1895 pr_warning("unknown feature %d\n", feat);
1896 return 0;
1897 }
1898 if (!feat_ops[feat].print)
1899 return 0;
1900
1901 if (!feat_ops[feat].full_only || hd->full)
1902 feat_ops[feat].print(ph, fd, hd->fp);
1903 else
1904 fprintf(hd->fp, "# %s info available, use -I to display\n",
1905 feat_ops[feat].name);
1906
1907 return 0;
1908 }
1909
1910 int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
1911 {
1912 struct header_print_data hd;
1913 struct perf_header *header = &session->header;
1914 int fd = perf_data_file__fd(session->file);
1915 hd.fp = fp;
1916 hd.full = full;
1917
1918 perf_header__process_sections(header, fd, &hd,
1919 perf_file_section__fprintf_info);
1920 return 0;
1921 }
1922
1923 static int do_write_feat(int fd, struct perf_header *h, int type,
1924 struct perf_file_section **p,
1925 struct perf_evlist *evlist)
1926 {
1927 int err;
1928 int ret = 0;
1929
1930 if (perf_header__has_feat(h, type)) {
1931 if (!feat_ops[type].write)
1932 return -1;
1933
1934 (*p)->offset = lseek(fd, 0, SEEK_CUR);
1935
1936 err = feat_ops[type].write(fd, h, evlist);
1937 if (err < 0) {
1938 pr_debug("failed to write feature %d\n", type);
1939
1940 /* undo anything written */
1941 lseek(fd, (*p)->offset, SEEK_SET);
1942
1943 return -1;
1944 }
1945 (*p)->size = lseek(fd, 0, SEEK_CUR) - (*p)->offset;
1946 (*p)++;
1947 }
1948 return ret;
1949 }
1950
1951 static int perf_header__adds_write(struct perf_header *header,
1952 struct perf_evlist *evlist, int fd)
1953 {
1954 int nr_sections;
1955 struct perf_file_section *feat_sec, *p;
1956 int sec_size;
1957 u64 sec_start;
1958 int feat;
1959 int err;
1960
1961 nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
1962 if (!nr_sections)
1963 return 0;
1964
1965 feat_sec = p = calloc(nr_sections, sizeof(*feat_sec));
1966 if (feat_sec == NULL)
1967 return -ENOMEM;
1968
1969 sec_size = sizeof(*feat_sec) * nr_sections;
1970
1971 sec_start = header->feat_offset;
1972 lseek(fd, sec_start + sec_size, SEEK_SET);
1973
1974 for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
1975 if (do_write_feat(fd, header, feat, &p, evlist))
1976 perf_header__clear_feat(header, feat);
1977 }
1978
1979 lseek(fd, sec_start, SEEK_SET);
1980 /*
1981 * may write more than needed due to dropped feature, but
1982 * this is okay, reader will skip the mising entries
1983 */
1984 err = do_write(fd, feat_sec, sec_size);
1985 if (err < 0)
1986 pr_debug("failed to write feature section\n");
1987 free(feat_sec);
1988 return err;
1989 }
1990
1991 int perf_header__write_pipe(int fd)
1992 {
1993 struct perf_pipe_file_header f_header;
1994 int err;
1995
1996 f_header = (struct perf_pipe_file_header){
1997 .magic = PERF_MAGIC,
1998 .size = sizeof(f_header),
1999 };
2000
2001 err = do_write(fd, &f_header, sizeof(f_header));
2002 if (err < 0) {
2003 pr_debug("failed to write perf pipe header\n");
2004 return err;
2005 }
2006
2007 return 0;
2008 }
2009
2010 int perf_session__write_header(struct perf_session *session,
2011 struct perf_evlist *evlist,
2012 int fd, bool at_exit)
2013 {
2014 struct perf_file_header f_header;
2015 struct perf_file_attr f_attr;
2016 struct perf_header *header = &session->header;
2017 struct perf_evsel *evsel;
2018 u64 attr_offset;
2019 int err;
2020
2021 lseek(fd, sizeof(f_header), SEEK_SET);
2022
2023 evlist__for_each(session->evlist, evsel) {
2024 evsel->id_offset = lseek(fd, 0, SEEK_CUR);
2025 err = do_write(fd, evsel->id, evsel->ids * sizeof(u64));
2026 if (err < 0) {
2027 pr_debug("failed to write perf header\n");
2028 return err;
2029 }
2030 }
2031
2032 attr_offset = lseek(fd, 0, SEEK_CUR);
2033
2034 evlist__for_each(evlist, evsel) {
2035 f_attr = (struct perf_file_attr){
2036 .attr = evsel->attr,
2037 .ids = {
2038 .offset = evsel->id_offset,
2039 .size = evsel->ids * sizeof(u64),
2040 }
2041 };
2042 err = do_write(fd, &f_attr, sizeof(f_attr));
2043 if (err < 0) {
2044 pr_debug("failed to write perf header attribute\n");
2045 return err;
2046 }
2047 }
2048
2049 if (!header->data_offset)
2050 header->data_offset = lseek(fd, 0, SEEK_CUR);
2051 header->feat_offset = header->data_offset + header->data_size;
2052
2053 if (at_exit) {
2054 err = perf_header__adds_write(header, evlist, fd);
2055 if (err < 0)
2056 return err;
2057 }
2058
2059 f_header = (struct perf_file_header){
2060 .magic = PERF_MAGIC,
2061 .size = sizeof(f_header),
2062 .attr_size = sizeof(f_attr),
2063 .attrs = {
2064 .offset = attr_offset,
2065 .size = evlist->nr_entries * sizeof(f_attr),
2066 },
2067 .data = {
2068 .offset = header->data_offset,
2069 .size = header->data_size,
2070 },
2071 /* event_types is ignored, store zeros */
2072 };
2073
2074 memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));
2075
2076 lseek(fd, 0, SEEK_SET);
2077 err = do_write(fd, &f_header, sizeof(f_header));
2078 if (err < 0) {
2079 pr_debug("failed to write perf header\n");
2080 return err;
2081 }
2082 lseek(fd, header->data_offset + header->data_size, SEEK_SET);
2083
2084 return 0;
2085 }
2086
2087 static int perf_header__getbuffer64(struct perf_header *header,
2088 int fd, void *buf, size_t size)
2089 {
2090 if (readn(fd, buf, size) <= 0)
2091 return -1;
2092
2093 if (header->needs_swap)
2094 mem_bswap_64(buf, size);
2095
2096 return 0;
2097 }
2098
2099 int perf_header__process_sections(struct perf_header *header, int fd,
2100 void *data,
2101 int (*process)(struct perf_file_section *section,
2102 struct perf_header *ph,
2103 int feat, int fd, void *data))
2104 {
2105 struct perf_file_section *feat_sec, *sec;
2106 int nr_sections;
2107 int sec_size;
2108 int feat;
2109 int err;
2110
2111 nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
2112 if (!nr_sections)
2113 return 0;
2114
2115 feat_sec = sec = calloc(nr_sections, sizeof(*feat_sec));
2116 if (!feat_sec)
2117 return -1;
2118
2119 sec_size = sizeof(*feat_sec) * nr_sections;
2120
2121 lseek(fd, header->feat_offset, SEEK_SET);
2122
2123 err = perf_header__getbuffer64(header, fd, feat_sec, sec_size);
2124 if (err < 0)
2125 goto out_free;
2126
2127 for_each_set_bit(feat, header->adds_features, HEADER_LAST_FEATURE) {
2128 err = process(sec++, header, feat, fd, data);
2129 if (err < 0)
2130 goto out_free;
2131 }
2132 err = 0;
2133 out_free:
2134 free(feat_sec);
2135 return err;
2136 }
2137
2138 static const int attr_file_abi_sizes[] = {
2139 [0] = PERF_ATTR_SIZE_VER0,
2140 [1] = PERF_ATTR_SIZE_VER1,
2141 [2] = PERF_ATTR_SIZE_VER2,
2142 [3] = PERF_ATTR_SIZE_VER3,
2143 [4] = PERF_ATTR_SIZE_VER4,
2144 0,
2145 };
2146
2147 /*
2148 * In the legacy file format, the magic number is not used to encode endianness.
2149 * hdr_sz was used to encode endianness. But given that hdr_sz can vary based
2150 * on ABI revisions, we need to try all combinations for all endianness to
2151 * detect the endianness.
2152 */
2153 static int try_all_file_abis(uint64_t hdr_sz, struct perf_header *ph)
2154 {
2155 uint64_t ref_size, attr_size;
2156 int i;
2157
2158 for (i = 0 ; attr_file_abi_sizes[i]; i++) {
2159 ref_size = attr_file_abi_sizes[i]
2160 + sizeof(struct perf_file_section);
2161 if (hdr_sz != ref_size) {
2162 attr_size = bswap_64(hdr_sz);
2163 if (attr_size != ref_size)
2164 continue;
2165
2166 ph->needs_swap = true;
2167 }
2168 pr_debug("ABI%d perf.data file detected, need_swap=%d\n",
2169 i,
2170 ph->needs_swap);
2171 return 0;
2172 }
2173 /* could not determine endianness */
2174 return -1;
2175 }
2176
2177 #define PERF_PIPE_HDR_VER0 16
2178
2179 static const size_t attr_pipe_abi_sizes[] = {
2180 [0] = PERF_PIPE_HDR_VER0,
2181 0,
2182 };
2183
2184 /*
2185 * In the legacy pipe format, there is an implicit assumption that endiannesss
2186 * between host recording the samples, and host parsing the samples is the
2187 * same. This is not always the case given that the pipe output may always be
2188 * redirected into a file and analyzed on a different machine with possibly a
2189 * different endianness and perf_event ABI revsions in the perf tool itself.
2190 */
2191 static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph)
2192 {
2193 u64 attr_size;
2194 int i;
2195
2196 for (i = 0 ; attr_pipe_abi_sizes[i]; i++) {
2197 if (hdr_sz != attr_pipe_abi_sizes[i]) {
2198 attr_size = bswap_64(hdr_sz);
2199 if (attr_size != hdr_sz)
2200 continue;
2201
2202 ph->needs_swap = true;
2203 }
2204 pr_debug("Pipe ABI%d perf.data file detected\n", i);
2205 return 0;
2206 }
2207 return -1;
2208 }
2209
2210 bool is_perf_magic(u64 magic)
2211 {
2212 if (!memcmp(&magic, __perf_magic1, sizeof(magic))
2213 || magic == __perf_magic2
2214 || magic == __perf_magic2_sw)
2215 return true;
2216
2217 return false;
2218 }
2219
2220 static int check_magic_endian(u64 magic, uint64_t hdr_sz,
2221 bool is_pipe, struct perf_header *ph)
2222 {
2223 int ret;
2224
2225 /* check for legacy format */
2226 ret = memcmp(&magic, __perf_magic1, sizeof(magic));
2227 if (ret == 0) {
2228 ph->version = PERF_HEADER_VERSION_1;
2229 pr_debug("legacy perf.data format\n");
2230 if (is_pipe)
2231 return try_all_pipe_abis(hdr_sz, ph);
2232
2233 return try_all_file_abis(hdr_sz, ph);
2234 }
2235 /*
2236 * the new magic number serves two purposes:
2237 * - unique number to identify actual perf.data files
2238 * - encode endianness of file
2239 */
2240 ph->version = PERF_HEADER_VERSION_2;
2241
2242 /* check magic number with one endianness */
2243 if (magic == __perf_magic2)
2244 return 0;
2245
2246 /* check magic number with opposite endianness */
2247 if (magic != __perf_magic2_sw)
2248 return -1;
2249
2250 ph->needs_swap = true;
2251
2252 return 0;
2253 }
2254
2255 int perf_file_header__read(struct perf_file_header *header,
2256 struct perf_header *ph, int fd)
2257 {
2258 ssize_t ret;
2259
2260 lseek(fd, 0, SEEK_SET);
2261
2262 ret = readn(fd, header, sizeof(*header));
2263 if (ret <= 0)
2264 return -1;
2265
2266 if (check_magic_endian(header->magic,
2267 header->attr_size, false, ph) < 0) {
2268 pr_debug("magic/endian check failed\n");
2269 return -1;
2270 }
2271
2272 if (ph->needs_swap) {
2273 mem_bswap_64(header, offsetof(struct perf_file_header,
2274 adds_features));
2275 }
2276
2277 if (header->size != sizeof(*header)) {
2278 /* Support the previous format */
2279 if (header->size == offsetof(typeof(*header), adds_features))
2280 bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
2281 else
2282 return -1;
2283 } else if (ph->needs_swap) {
2284 /*
2285 * feature bitmap is declared as an array of unsigned longs --
2286 * not good since its size can differ between the host that
2287 * generated the data file and the host analyzing the file.
2288 *
2289 * We need to handle endianness, but we don't know the size of
2290 * the unsigned long where the file was generated. Take a best
2291 * guess at determining it: try 64-bit swap first (ie., file
2292 * created on a 64-bit host), and check if the hostname feature
2293 * bit is set (this feature bit is forced on as of fbe96f2).
2294 * If the bit is not, undo the 64-bit swap and try a 32-bit
2295 * swap. If the hostname bit is still not set (e.g., older data
2296 * file), punt and fallback to the original behavior --
2297 * clearing all feature bits and setting buildid.
2298 */
2299 mem_bswap_64(&header->adds_features,
2300 BITS_TO_U64(HEADER_FEAT_BITS));
2301
2302 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
2303 /* unswap as u64 */
2304 mem_bswap_64(&header->adds_features,
2305 BITS_TO_U64(HEADER_FEAT_BITS));
2306
2307 /* unswap as u32 */
2308 mem_bswap_32(&header->adds_features,
2309 BITS_TO_U32(HEADER_FEAT_BITS));
2310 }
2311
2312 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
2313 bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
2314 set_bit(HEADER_BUILD_ID, header->adds_features);
2315 }
2316 }
2317
2318 memcpy(&ph->adds_features, &header->adds_features,
2319 sizeof(ph->adds_features));
2320
2321 ph->data_offset = header->data.offset;
2322 ph->data_size = header->data.size;
2323 ph->feat_offset = header->data.offset + header->data.size;
2324 return 0;
2325 }
2326
2327 static int perf_file_section__process(struct perf_file_section *section,
2328 struct perf_header *ph,
2329 int feat, int fd, void *data)
2330 {
2331 if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
2332 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
2333 "%d, continuing...\n", section->offset, feat);
2334 return 0;
2335 }
2336
2337 if (feat >= HEADER_LAST_FEATURE) {
2338 pr_debug("unknown feature %d, continuing...\n", feat);
2339 return 0;
2340 }
2341
2342 if (!feat_ops[feat].process)
2343 return 0;
2344
2345 return feat_ops[feat].process(section, ph, fd, data);
2346 }
2347
2348 static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
2349 struct perf_header *ph, int fd,
2350 bool repipe)
2351 {
2352 ssize_t ret;
2353
2354 ret = readn(fd, header, sizeof(*header));
2355 if (ret <= 0)
2356 return -1;
2357
2358 if (check_magic_endian(header->magic, header->size, true, ph) < 0) {
2359 pr_debug("endian/magic failed\n");
2360 return -1;
2361 }
2362
2363 if (ph->needs_swap)
2364 header->size = bswap_64(header->size);
2365
2366 if (repipe && do_write(STDOUT_FILENO, header, sizeof(*header)) < 0)
2367 return -1;
2368
2369 return 0;
2370 }
2371
2372 static int perf_header__read_pipe(struct perf_session *session)
2373 {
2374 struct perf_header *header = &session->header;
2375 struct perf_pipe_file_header f_header;
2376
2377 if (perf_file_header__read_pipe(&f_header, header,
2378 perf_data_file__fd(session->file),
2379 session->repipe) < 0) {
2380 pr_debug("incompatible file format\n");
2381 return -EINVAL;
2382 }
2383
2384 return 0;
2385 }
2386
2387 static int read_attr(int fd, struct perf_header *ph,
2388 struct perf_file_attr *f_attr)
2389 {
2390 struct perf_event_attr *attr = &f_attr->attr;
2391 size_t sz, left;
2392 size_t our_sz = sizeof(f_attr->attr);
2393 ssize_t ret;
2394
2395 memset(f_attr, 0, sizeof(*f_attr));
2396
2397 /* read minimal guaranteed structure */
2398 ret = readn(fd, attr, PERF_ATTR_SIZE_VER0);
2399 if (ret <= 0) {
2400 pr_debug("cannot read %d bytes of header attr\n",
2401 PERF_ATTR_SIZE_VER0);
2402 return -1;
2403 }
2404
2405 /* on file perf_event_attr size */
2406 sz = attr->size;
2407
2408 if (ph->needs_swap)
2409 sz = bswap_32(sz);
2410
2411 if (sz == 0) {
2412 /* assume ABI0 */
2413 sz = PERF_ATTR_SIZE_VER0;
2414 } else if (sz > our_sz) {
2415 pr_debug("file uses a more recent and unsupported ABI"
2416 " (%zu bytes extra)\n", sz - our_sz);
2417 return -1;
2418 }
2419 /* what we have not yet read and that we know about */
2420 left = sz - PERF_ATTR_SIZE_VER0;
2421 if (left) {
2422 void *ptr = attr;
2423 ptr += PERF_ATTR_SIZE_VER0;
2424
2425 ret = readn(fd, ptr, left);
2426 }
2427 /* read perf_file_section, ids are read in caller */
2428 ret = readn(fd, &f_attr->ids, sizeof(f_attr->ids));
2429
2430 return ret <= 0 ? -1 : 0;
2431 }
2432
2433 static int perf_evsel__prepare_tracepoint_event(struct perf_evsel *evsel,
2434 struct pevent *pevent)
2435 {
2436 struct event_format *event;
2437 char bf[128];
2438
2439 /* already prepared */
2440 if (evsel->tp_format)
2441 return 0;
2442
2443 if (pevent == NULL) {
2444 pr_debug("broken or missing trace data\n");
2445 return -1;
2446 }
2447
2448 event = pevent_find_event(pevent, evsel->attr.config);
2449 if (event == NULL)
2450 return -1;
2451
2452 if (!evsel->name) {
2453 snprintf(bf, sizeof(bf), "%s:%s", event->system, event->name);
2454 evsel->name = strdup(bf);
2455 if (evsel->name == NULL)
2456 return -1;
2457 }
2458
2459 evsel->tp_format = event;
2460 return 0;
2461 }
2462
2463 static int perf_evlist__prepare_tracepoint_events(struct perf_evlist *evlist,
2464 struct pevent *pevent)
2465 {
2466 struct perf_evsel *pos;
2467
2468 evlist__for_each(evlist, pos) {
2469 if (pos->attr.type == PERF_TYPE_TRACEPOINT &&
2470 perf_evsel__prepare_tracepoint_event(pos, pevent))
2471 return -1;
2472 }
2473
2474 return 0;
2475 }
2476
2477 int perf_session__read_header(struct perf_session *session)
2478 {
2479 struct perf_data_file *file = session->file;
2480 struct perf_header *header = &session->header;
2481 struct perf_file_header f_header;
2482 struct perf_file_attr f_attr;
2483 u64 f_id;
2484 int nr_attrs, nr_ids, i, j;
2485 int fd = perf_data_file__fd(file);
2486
2487 session->evlist = perf_evlist__new();
2488 if (session->evlist == NULL)
2489 return -ENOMEM;
2490
2491 if (perf_data_file__is_pipe(file))
2492 return perf_header__read_pipe(session);
2493
2494 if (perf_file_header__read(&f_header, header, fd) < 0)
2495 return -EINVAL;
2496
2497 /*
2498 * Sanity check that perf.data was written cleanly; data size is
2499 * initialized to 0 and updated only if the on_exit function is run.
2500 * If data size is still 0 then the file contains only partial
2501 * information. Just warn user and process it as much as it can.
2502 */
2503 if (f_header.data.size == 0) {
2504 pr_warning("WARNING: The %s file's data size field is 0 which is unexpected.\n"
2505 "Was the 'perf record' command properly terminated?\n",
2506 file->path);
2507 }
2508
2509 nr_attrs = f_header.attrs.size / f_header.attr_size;
2510 lseek(fd, f_header.attrs.offset, SEEK_SET);
2511
2512 for (i = 0; i < nr_attrs; i++) {
2513 struct perf_evsel *evsel;
2514 off_t tmp;
2515
2516 if (read_attr(fd, header, &f_attr) < 0)
2517 goto out_errno;
2518
2519 if (header->needs_swap)
2520 perf_event__attr_swap(&f_attr.attr);
2521
2522 tmp = lseek(fd, 0, SEEK_CUR);
2523 evsel = perf_evsel__new(&f_attr.attr);
2524
2525 if (evsel == NULL)
2526 goto out_delete_evlist;
2527
2528 evsel->needs_swap = header->needs_swap;
2529 /*
2530 * Do it before so that if perf_evsel__alloc_id fails, this
2531 * entry gets purged too at perf_evlist__delete().
2532 */
2533 perf_evlist__add(session->evlist, evsel);
2534
2535 nr_ids = f_attr.ids.size / sizeof(u64);
2536 /*
2537 * We don't have the cpu and thread maps on the header, so
2538 * for allocating the perf_sample_id table we fake 1 cpu and
2539 * hattr->ids threads.
2540 */
2541 if (perf_evsel__alloc_id(evsel, 1, nr_ids))
2542 goto out_delete_evlist;
2543
2544 lseek(fd, f_attr.ids.offset, SEEK_SET);
2545
2546 for (j = 0; j < nr_ids; j++) {
2547 if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))
2548 goto out_errno;
2549
2550 perf_evlist__id_add(session->evlist, evsel, 0, j, f_id);
2551 }
2552
2553 lseek(fd, tmp, SEEK_SET);
2554 }
2555
2556 symbol_conf.nr_events = nr_attrs;
2557
2558 perf_header__process_sections(header, fd, &session->tevent,
2559 perf_file_section__process);
2560
2561 if (perf_evlist__prepare_tracepoint_events(session->evlist,
2562 session->tevent.pevent))
2563 goto out_delete_evlist;
2564
2565 return 0;
2566 out_errno:
2567 return -errno;
2568
2569 out_delete_evlist:
2570 perf_evlist__delete(session->evlist);
2571 session->evlist = NULL;
2572 return -ENOMEM;
2573 }
2574
2575 int perf_event__synthesize_attr(struct perf_tool *tool,
2576 struct perf_event_attr *attr, u32 ids, u64 *id,
2577 perf_event__handler_t process)
2578 {
2579 union perf_event *ev;
2580 size_t size;
2581 int err;
2582
2583 size = sizeof(struct perf_event_attr);
2584 size = PERF_ALIGN(size, sizeof(u64));
2585 size += sizeof(struct perf_event_header);
2586 size += ids * sizeof(u64);
2587
2588 ev = malloc(size);
2589
2590 if (ev == NULL)
2591 return -ENOMEM;
2592
2593 ev->attr.attr = *attr;
2594 memcpy(ev->attr.id, id, ids * sizeof(u64));
2595
2596 ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2597 ev->attr.header.size = (u16)size;
2598
2599 if (ev->attr.header.size == size)
2600 err = process(tool, ev, NULL, NULL);
2601 else
2602 err = -E2BIG;
2603
2604 free(ev);
2605
2606 return err;
2607 }
2608
2609 int perf_event__synthesize_attrs(struct perf_tool *tool,
2610 struct perf_session *session,
2611 perf_event__handler_t process)
2612 {
2613 struct perf_evsel *evsel;
2614 int err = 0;
2615
2616 evlist__for_each(session->evlist, evsel) {
2617 err = perf_event__synthesize_attr(tool, &evsel->attr, evsel->ids,
2618 evsel->id, process);
2619 if (err) {
2620 pr_debug("failed to create perf header attribute\n");
2621 return err;
2622 }
2623 }
2624
2625 return err;
2626 }
2627
2628 int perf_event__process_attr(struct perf_tool *tool __maybe_unused,
2629 union perf_event *event,
2630 struct perf_evlist **pevlist)
2631 {
2632 u32 i, ids, n_ids;
2633 struct perf_evsel *evsel;
2634 struct perf_evlist *evlist = *pevlist;
2635
2636 if (evlist == NULL) {
2637 *pevlist = evlist = perf_evlist__new();
2638 if (evlist == NULL)
2639 return -ENOMEM;
2640 }
2641
2642 evsel = perf_evsel__new(&event->attr.attr);
2643 if (evsel == NULL)
2644 return -ENOMEM;
2645
2646 perf_evlist__add(evlist, evsel);
2647
2648 ids = event->header.size;
2649 ids -= (void *)&event->attr.id - (void *)event;
2650 n_ids = ids / sizeof(u64);
2651 /*
2652 * We don't have the cpu and thread maps on the header, so
2653 * for allocating the perf_sample_id table we fake 1 cpu and
2654 * hattr->ids threads.
2655 */
2656 if (perf_evsel__alloc_id(evsel, 1, n_ids))
2657 return -ENOMEM;
2658
2659 for (i = 0; i < n_ids; i++) {
2660 perf_evlist__id_add(evlist, evsel, 0, i, event->attr.id[i]);
2661 }
2662
2663 symbol_conf.nr_events = evlist->nr_entries;
2664
2665 return 0;
2666 }
2667
2668 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd,
2669 struct perf_evlist *evlist,
2670 perf_event__handler_t process)
2671 {
2672 union perf_event ev;
2673 struct tracing_data *tdata;
2674 ssize_t size = 0, aligned_size = 0, padding;
2675 int err __maybe_unused = 0;
2676
2677 /*
2678 * We are going to store the size of the data followed
2679 * by the data contents. Since the fd descriptor is a pipe,
2680 * we cannot seek back to store the size of the data once
2681 * we know it. Instead we:
2682 *
2683 * - write the tracing data to the temp file
2684 * - get/write the data size to pipe
2685 * - write the tracing data from the temp file
2686 * to the pipe
2687 */
2688 tdata = tracing_data_get(&evlist->entries, fd, true);
2689 if (!tdata)
2690 return -1;
2691
2692 memset(&ev, 0, sizeof(ev));
2693
2694 ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
2695 size = tdata->size;
2696 aligned_size = PERF_ALIGN(size, sizeof(u64));
2697 padding = aligned_size - size;
2698 ev.tracing_data.header.size = sizeof(ev.tracing_data);
2699 ev.tracing_data.size = aligned_size;
2700
2701 process(tool, &ev, NULL, NULL);
2702
2703 /*
2704 * The put function will copy all the tracing data
2705 * stored in temp file to the pipe.
2706 */
2707 tracing_data_put(tdata);
2708
2709 write_padded(fd, NULL, 0, padding);
2710
2711 return aligned_size;
2712 }
2713
2714 int perf_event__process_tracing_data(struct perf_tool *tool __maybe_unused,
2715 union perf_event *event,
2716 struct perf_session *session)
2717 {
2718 ssize_t size_read, padding, size = event->tracing_data.size;
2719 int fd = perf_data_file__fd(session->file);
2720 off_t offset = lseek(fd, 0, SEEK_CUR);
2721 char buf[BUFSIZ];
2722
2723 /* setup for reading amidst mmap */
2724 lseek(fd, offset + sizeof(struct tracing_data_event),
2725 SEEK_SET);
2726
2727 size_read = trace_report(fd, &session->tevent,
2728 session->repipe);
2729 padding = PERF_ALIGN(size_read, sizeof(u64)) - size_read;
2730
2731 if (readn(fd, buf, padding) < 0) {
2732 pr_err("%s: reading input file", __func__);
2733 return -1;
2734 }
2735 if (session->repipe) {
2736 int retw = write(STDOUT_FILENO, buf, padding);
2737 if (retw <= 0 || retw != padding) {
2738 pr_err("%s: repiping tracing data padding", __func__);
2739 return -1;
2740 }
2741 }
2742
2743 if (size_read + padding != size) {
2744 pr_err("%s: tracing data size mismatch", __func__);
2745 return -1;
2746 }
2747
2748 perf_evlist__prepare_tracepoint_events(session->evlist,
2749 session->tevent.pevent);
2750
2751 return size_read + padding;
2752 }
2753
2754 int perf_event__synthesize_build_id(struct perf_tool *tool,
2755 struct dso *pos, u16 misc,
2756 perf_event__handler_t process,
2757 struct machine *machine)
2758 {
2759 union perf_event ev;
2760 size_t len;
2761 int err = 0;
2762
2763 if (!pos->hit)
2764 return err;
2765
2766 memset(&ev, 0, sizeof(ev));
2767
2768 len = pos->long_name_len + 1;
2769 len = PERF_ALIGN(len, NAME_ALIGN);
2770 memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
2771 ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
2772 ev.build_id.header.misc = misc;
2773 ev.build_id.pid = machine->pid;
2774 ev.build_id.header.size = sizeof(ev.build_id) + len;
2775 memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
2776
2777 err = process(tool, &ev, NULL, machine);
2778
2779 return err;
2780 }
2781
2782 int perf_event__process_build_id(struct perf_tool *tool __maybe_unused,
2783 union perf_event *event,
2784 struct perf_session *session)
2785 {
2786 __event_process_build_id(&event->build_id,
2787 event->build_id.filename,
2788 session);
2789 return 0;
2790 }
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