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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#include <api/fs/fs.h>
27#include "asm/bug.h"
28
29/*
30 * magic2 = "PERFILE2"
31 * must be a numerical value to let the endianness
32 * determine the memory layout. That way we are able
33 * to detect endianness when reading the perf.data file
34 * back.
35 *
36 * we check for legacy (PERFFILE) format.
37 */
38static const char *__perf_magic1 = "PERFFILE";
39static const u64 __perf_magic2 = 0x32454c4946524550ULL;
40static const u64 __perf_magic2_sw = 0x50455246494c4532ULL;
41
42#define PERF_MAGIC __perf_magic2
43
44struct perf_file_attr {
45 struct perf_event_attr attr;
46 struct perf_file_section ids;
47};
48
49void perf_header__set_feat(struct perf_header *header, int feat)
50{
51 set_bit(feat, header->adds_features);
52}
53
54void perf_header__clear_feat(struct perf_header *header, int feat)
55{
56 clear_bit(feat, header->adds_features);
57}
58
59bool perf_header__has_feat(const struct perf_header *header, int feat)
60{
61 return test_bit(feat, header->adds_features);
62}
63
64static int do_write(int fd, const void *buf, size_t size)
65{
66 while (size) {
67 int ret = write(fd, buf, size);
68
69 if (ret < 0)
70 return -errno;
71
72 size -= ret;
73 buf += ret;
74 }
75
76 return 0;
77}
78
79int write_padded(int fd, const void *bf, size_t count, size_t count_aligned)
80{
81 static const char zero_buf[NAME_ALIGN];
82 int err = do_write(fd, bf, count);
83
84 if (!err)
85 err = do_write(fd, zero_buf, count_aligned - count);
86
87 return err;
88}
89
90#define string_size(str) \
91 (PERF_ALIGN((strlen(str) + 1), NAME_ALIGN) + sizeof(u32))
92
93static int do_write_string(int fd, const char *str)
94{
95 u32 len, olen;
96 int ret;
97
98 olen = strlen(str) + 1;
99 len = PERF_ALIGN(olen, NAME_ALIGN);
100
101 /* write len, incl. \0 */
102 ret = do_write(fd, &len, sizeof(len));
103 if (ret < 0)
104 return ret;
105
106 return write_padded(fd, str, olen, len);
107}
108
109static char *do_read_string(int fd, struct perf_header *ph)
110{
111 ssize_t sz, ret;
112 u32 len;
113 char *buf;
114
115 sz = readn(fd, &len, sizeof(len));
116 if (sz < (ssize_t)sizeof(len))
117 return NULL;
118
119 if (ph->needs_swap)
120 len = bswap_32(len);
121
122 buf = malloc(len);
123 if (!buf)
124 return NULL;
125
126 ret = readn(fd, buf, len);
127 if (ret == (ssize_t)len) {
128 /*
129 * strings are padded by zeroes
130 * thus the actual strlen of buf
131 * may be less than len
132 */
133 return buf;
134 }
135
136 free(buf);
137 return NULL;
138}
139
140static int write_tracing_data(int fd, struct perf_header *h __maybe_unused,
141 struct perf_evlist *evlist)
142{
143 return read_tracing_data(fd, &evlist->entries);
144}
145
146
147static int write_build_id(int fd, struct perf_header *h,
148 struct perf_evlist *evlist __maybe_unused)
149{
150 struct perf_session *session;
151 int err;
152
153 session = container_of(h, struct perf_session, header);
154
155 if (!perf_session__read_build_ids(session, true))
156 return -1;
157
158 err = perf_session__write_buildid_table(session, fd);
159 if (err < 0) {
160 pr_debug("failed to write buildid table\n");
161 return err;
162 }
163 perf_session__cache_build_ids(session);
164
165 return 0;
166}
167
168static int write_hostname(int fd, struct perf_header *h __maybe_unused,
169 struct perf_evlist *evlist __maybe_unused)
170{
171 struct utsname uts;
172 int ret;
173
174 ret = uname(&uts);
175 if (ret < 0)
176 return -1;
177
178 return do_write_string(fd, uts.nodename);
179}
180
181static int write_osrelease(int fd, struct perf_header *h __maybe_unused,
182 struct perf_evlist *evlist __maybe_unused)
183{
184 struct utsname uts;
185 int ret;
186
187 ret = uname(&uts);
188 if (ret < 0)
189 return -1;
190
191 return do_write_string(fd, uts.release);
192}
193
194static int write_arch(int fd, struct perf_header *h __maybe_unused,
195 struct perf_evlist *evlist __maybe_unused)
196{
197 struct utsname uts;
198 int ret;
199
200 ret = uname(&uts);
201 if (ret < 0)
202 return -1;
203
204 return do_write_string(fd, uts.machine);
205}
206
207static int write_version(int fd, struct perf_header *h __maybe_unused,
208 struct perf_evlist *evlist __maybe_unused)
209{
210 return do_write_string(fd, perf_version_string);
211}
212
213static int __write_cpudesc(int fd, const char *cpuinfo_proc)
214{
215 FILE *file;
216 char *buf = NULL;
217 char *s, *p;
218 const char *search = cpuinfo_proc;
219 size_t len = 0;
220 int ret = -1;
221
222 if (!search)
223 return -1;
224
225 file = fopen("/proc/cpuinfo", "r");
226 if (!file)
227 return -1;
228
229 while (getline(&buf, &len, file) > 0) {
230 ret = strncmp(buf, search, strlen(search));
231 if (!ret)
232 break;
233 }
234
235 if (ret) {
236 ret = -1;
237 goto done;
238 }
239
240 s = buf;
241
242 p = strchr(buf, ':');
243 if (p && *(p+1) == ' ' && *(p+2))
244 s = p + 2;
245 p = strchr(s, '\n');
246 if (p)
247 *p = '\0';
248
249 /* squash extra space characters (branding string) */
250 p = s;
251 while (*p) {
252 if (isspace(*p)) {
253 char *r = p + 1;
254 char *q = r;
255 *p = ' ';
256 while (*q && isspace(*q))
257 q++;
258 if (q != (p+1))
259 while ((*r++ = *q++));
260 }
261 p++;
262 }
263 ret = do_write_string(fd, s);
264done:
265 free(buf);
266 fclose(file);
267 return ret;
268}
269
270static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,
271 struct perf_evlist *evlist __maybe_unused)
272{
273#ifndef CPUINFO_PROC
274#define CPUINFO_PROC {"model name", }
275#endif
276 const char *cpuinfo_procs[] = CPUINFO_PROC;
277 unsigned int i;
278
279 for (i = 0; i < ARRAY_SIZE(cpuinfo_procs); i++) {
280 int ret;
281 ret = __write_cpudesc(fd, cpuinfo_procs[i]);
282 if (ret >= 0)
283 return ret;
284 }
285 return -1;
286}
287
288
289static int write_nrcpus(int fd, struct perf_header *h __maybe_unused,
290 struct perf_evlist *evlist __maybe_unused)
291{
292 long nr;
293 u32 nrc, nra;
294 int ret;
295
296 nr = sysconf(_SC_NPROCESSORS_CONF);
297 if (nr < 0)
298 return -1;
299
300 nrc = (u32)(nr & UINT_MAX);
301
302 nr = sysconf(_SC_NPROCESSORS_ONLN);
303 if (nr < 0)
304 return -1;
305
306 nra = (u32)(nr & UINT_MAX);
307
308 ret = do_write(fd, &nrc, sizeof(nrc));
309 if (ret < 0)
310 return ret;
311
312 return do_write(fd, &nra, sizeof(nra));
313}
314
315static int write_event_desc(int fd, struct perf_header *h __maybe_unused,
316 struct perf_evlist *evlist)
317{
318 struct perf_evsel *evsel;
319 u32 nre, nri, sz;
320 int ret;
321
322 nre = evlist->nr_entries;
323
324 /*
325 * write number of events
326 */
327 ret = do_write(fd, &nre, sizeof(nre));
328 if (ret < 0)
329 return ret;
330
331 /*
332 * size of perf_event_attr struct
333 */
334 sz = (u32)sizeof(evsel->attr);
335 ret = do_write(fd, &sz, sizeof(sz));
336 if (ret < 0)
337 return ret;
338
339 evlist__for_each(evlist, evsel) {
340 ret = do_write(fd, &evsel->attr, sz);
341 if (ret < 0)
342 return ret;
343 /*
344 * write number of unique id per event
345 * there is one id per instance of an event
346 *
347 * copy into an nri to be independent of the
348 * type of ids,
349 */
350 nri = evsel->ids;
351 ret = do_write(fd, &nri, sizeof(nri));
352 if (ret < 0)
353 return ret;
354
355 /*
356 * write event string as passed on cmdline
357 */
358 ret = do_write_string(fd, perf_evsel__name(evsel));
359 if (ret < 0)
360 return ret;
361 /*
362 * write unique ids for this event
363 */
364 ret = do_write(fd, evsel->id, evsel->ids * sizeof(u64));
365 if (ret < 0)
366 return ret;
367 }
368 return 0;
369}
370
371static int write_cmdline(int fd, struct perf_header *h __maybe_unused,
372 struct perf_evlist *evlist __maybe_unused)
373{
374 char buf[MAXPATHLEN];
375 char proc[32];
376 u32 n;
377 int i, ret;
378
379 /*
380 * actual atual path to perf binary
381 */
382 sprintf(proc, "/proc/%d/exe", getpid());
383 ret = readlink(proc, buf, sizeof(buf));
384 if (ret <= 0)
385 return -1;
386
387 /* readlink() does not add null termination */
388 buf[ret] = '\0';
389
390 /* account for binary path */
391 n = perf_env.nr_cmdline + 1;
392
393 ret = do_write(fd, &n, sizeof(n));
394 if (ret < 0)
395 return ret;
396
397 ret = do_write_string(fd, buf);
398 if (ret < 0)
399 return ret;
400
401 for (i = 0 ; i < perf_env.nr_cmdline; i++) {
402 ret = do_write_string(fd, perf_env.cmdline_argv[i]);
403 if (ret < 0)
404 return ret;
405 }
406 return 0;
407}
408
409#define CORE_SIB_FMT \
410 "/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
411#define THRD_SIB_FMT \
412 "/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
413
414struct cpu_topo {
415 u32 cpu_nr;
416 u32 core_sib;
417 u32 thread_sib;
418 char **core_siblings;
419 char **thread_siblings;
420};
421
422static int build_cpu_topo(struct cpu_topo *tp, int cpu)
423{
424 FILE *fp;
425 char filename[MAXPATHLEN];
426 char *buf = NULL, *p;
427 size_t len = 0;
428 ssize_t sret;
429 u32 i = 0;
430 int ret = -1;
431
432 sprintf(filename, CORE_SIB_FMT, cpu);
433 fp = fopen(filename, "r");
434 if (!fp)
435 goto try_threads;
436
437 sret = getline(&buf, &len, fp);
438 fclose(fp);
439 if (sret <= 0)
440 goto try_threads;
441
442 p = strchr(buf, '\n');
443 if (p)
444 *p = '\0';
445
446 for (i = 0; i < tp->core_sib; i++) {
447 if (!strcmp(buf, tp->core_siblings[i]))
448 break;
449 }
450 if (i == tp->core_sib) {
451 tp->core_siblings[i] = buf;
452 tp->core_sib++;
453 buf = NULL;
454 len = 0;
455 }
456 ret = 0;
457
458try_threads:
459 sprintf(filename, THRD_SIB_FMT, cpu);
460 fp = fopen(filename, "r");
461 if (!fp)
462 goto done;
463
464 if (getline(&buf, &len, fp) <= 0)
465 goto done;
466
467 p = strchr(buf, '\n');
468 if (p)
469 *p = '\0';
470
471 for (i = 0; i < tp->thread_sib; i++) {
472 if (!strcmp(buf, tp->thread_siblings[i]))
473 break;
474 }
475 if (i == tp->thread_sib) {
476 tp->thread_siblings[i] = buf;
477 tp->thread_sib++;
478 buf = NULL;
479 }
480 ret = 0;
481done:
482 if(fp)
483 fclose(fp);
484 free(buf);
485 return ret;
486}
487
488static void free_cpu_topo(struct cpu_topo *tp)
489{
490 u32 i;
491
492 if (!tp)
493 return;
494
495 for (i = 0 ; i < tp->core_sib; i++)
496 zfree(&tp->core_siblings[i]);
497
498 for (i = 0 ; i < tp->thread_sib; i++)
499 zfree(&tp->thread_siblings[i]);
500
501 free(tp);
502}
503
504static struct cpu_topo *build_cpu_topology(void)
505{
506 struct cpu_topo *tp;
507 void *addr;
508 u32 nr, i;
509 size_t sz;
510 long ncpus;
511 int ret = -1;
512
513 ncpus = sysconf(_SC_NPROCESSORS_CONF);
514 if (ncpus < 0)
515 return NULL;
516
517 nr = (u32)(ncpus & UINT_MAX);
518
519 sz = nr * sizeof(char *);
520
521 addr = calloc(1, sizeof(*tp) + 2 * sz);
522 if (!addr)
523 return NULL;
524
525 tp = addr;
526 tp->cpu_nr = nr;
527 addr += sizeof(*tp);
528 tp->core_siblings = addr;
529 addr += sz;
530 tp->thread_siblings = addr;
531
532 for (i = 0; i < nr; i++) {
533 ret = build_cpu_topo(tp, i);
534 if (ret < 0)
535 break;
536 }
537 if (ret) {
538 free_cpu_topo(tp);
539 tp = NULL;
540 }
541 return tp;
542}
543
544static int write_cpu_topology(int fd, struct perf_header *h __maybe_unused,
545 struct perf_evlist *evlist __maybe_unused)
546{
547 struct cpu_topo *tp;
548 u32 i;
549 int ret, j;
550
551 tp = build_cpu_topology();
552 if (!tp)
553 return -1;
554
555 ret = do_write(fd, &tp->core_sib, sizeof(tp->core_sib));
556 if (ret < 0)
557 goto done;
558
559 for (i = 0; i < tp->core_sib; i++) {
560 ret = do_write_string(fd, tp->core_siblings[i]);
561 if (ret < 0)
562 goto done;
563 }
564 ret = do_write(fd, &tp->thread_sib, sizeof(tp->thread_sib));
565 if (ret < 0)
566 goto done;
567
568 for (i = 0; i < tp->thread_sib; i++) {
569 ret = do_write_string(fd, tp->thread_siblings[i]);
570 if (ret < 0)
571 break;
572 }
573
574 ret = perf_env__read_cpu_topology_map(&perf_env);
575 if (ret < 0)
576 goto done;
577
578 for (j = 0; j < perf_env.nr_cpus_avail; j++) {
579 ret = do_write(fd, &perf_env.cpu[j].core_id,
580 sizeof(perf_env.cpu[j].core_id));
581 if (ret < 0)
582 return ret;
583 ret = do_write(fd, &perf_env.cpu[j].socket_id,
584 sizeof(perf_env.cpu[j].socket_id));
585 if (ret < 0)
586 return ret;
587 }
588done:
589 free_cpu_topo(tp);
590 return ret;
591}
592
593
594
595static int write_total_mem(int fd, struct perf_header *h __maybe_unused,
596 struct perf_evlist *evlist __maybe_unused)
597{
598 char *buf = NULL;
599 FILE *fp;
600 size_t len = 0;
601 int ret = -1, n;
602 uint64_t mem;
603
604 fp = fopen("/proc/meminfo", "r");
605 if (!fp)
606 return -1;
607
608 while (getline(&buf, &len, fp) > 0) {
609 ret = strncmp(buf, "MemTotal:", 9);
610 if (!ret)
611 break;
612 }
613 if (!ret) {
614 n = sscanf(buf, "%*s %"PRIu64, &mem);
615 if (n == 1)
616 ret = do_write(fd, &mem, sizeof(mem));
617 } else
618 ret = -1;
619 free(buf);
620 fclose(fp);
621 return ret;
622}
623
624static int write_topo_node(int fd, int node)
625{
626 char str[MAXPATHLEN];
627 char field[32];
628 char *buf = NULL, *p;
629 size_t len = 0;
630 FILE *fp;
631 u64 mem_total, mem_free, mem;
632 int ret = -1;
633
634 sprintf(str, "/sys/devices/system/node/node%d/meminfo", node);
635 fp = fopen(str, "r");
636 if (!fp)
637 return -1;
638
639 while (getline(&buf, &len, fp) > 0) {
640 /* skip over invalid lines */
641 if (!strchr(buf, ':'))
642 continue;
643 if (sscanf(buf, "%*s %*d %31s %"PRIu64, field, &mem) != 2)
644 goto done;
645 if (!strcmp(field, "MemTotal:"))
646 mem_total = mem;
647 if (!strcmp(field, "MemFree:"))
648 mem_free = mem;
649 }
650
651 fclose(fp);
652 fp = NULL;
653
654 ret = do_write(fd, &mem_total, sizeof(u64));
655 if (ret)
656 goto done;
657
658 ret = do_write(fd, &mem_free, sizeof(u64));
659 if (ret)
660 goto done;
661
662 ret = -1;
663 sprintf(str, "/sys/devices/system/node/node%d/cpulist", node);
664
665 fp = fopen(str, "r");
666 if (!fp)
667 goto done;
668
669 if (getline(&buf, &len, fp) <= 0)
670 goto done;
671
672 p = strchr(buf, '\n');
673 if (p)
674 *p = '\0';
675
676 ret = do_write_string(fd, buf);
677done:
678 free(buf);
679 if (fp)
680 fclose(fp);
681 return ret;
682}
683
684static int write_numa_topology(int fd, struct perf_header *h __maybe_unused,
685 struct perf_evlist *evlist __maybe_unused)
686{
687 char *buf = NULL;
688 size_t len = 0;
689 FILE *fp;
690 struct cpu_map *node_map = NULL;
691 char *c;
692 u32 nr, i, j;
693 int ret = -1;
694
695 fp = fopen("/sys/devices/system/node/online", "r");
696 if (!fp)
697 return -1;
698
699 if (getline(&buf, &len, fp) <= 0)
700 goto done;
701
702 c = strchr(buf, '\n');
703 if (c)
704 *c = '\0';
705
706 node_map = cpu_map__new(buf);
707 if (!node_map)
708 goto done;
709
710 nr = (u32)node_map->nr;
711
712 ret = do_write(fd, &nr, sizeof(nr));
713 if (ret < 0)
714 goto done;
715
716 for (i = 0; i < nr; i++) {
717 j = (u32)node_map->map[i];
718 ret = do_write(fd, &j, sizeof(j));
719 if (ret < 0)
720 break;
721
722 ret = write_topo_node(fd, i);
723 if (ret < 0)
724 break;
725 }
726done:
727 free(buf);
728 fclose(fp);
729 cpu_map__put(node_map);
730 return ret;
731}
732
733/*
734 * File format:
735 *
736 * struct pmu_mappings {
737 * u32 pmu_num;
738 * struct pmu_map {
739 * u32 type;
740 * char name[];
741 * }[pmu_num];
742 * };
743 */
744
745static int write_pmu_mappings(int fd, struct perf_header *h __maybe_unused,
746 struct perf_evlist *evlist __maybe_unused)
747{
748 struct perf_pmu *pmu = NULL;
749 off_t offset = lseek(fd, 0, SEEK_CUR);
750 __u32 pmu_num = 0;
751 int ret;
752
753 /* write real pmu_num later */
754 ret = do_write(fd, &pmu_num, sizeof(pmu_num));
755 if (ret < 0)
756 return ret;
757
758 while ((pmu = perf_pmu__scan(pmu))) {
759 if (!pmu->name)
760 continue;
761 pmu_num++;
762
763 ret = do_write(fd, &pmu->type, sizeof(pmu->type));
764 if (ret < 0)
765 return ret;
766
767 ret = do_write_string(fd, pmu->name);
768 if (ret < 0)
769 return ret;
770 }
771
772 if (pwrite(fd, &pmu_num, sizeof(pmu_num), offset) != sizeof(pmu_num)) {
773 /* discard all */
774 lseek(fd, offset, SEEK_SET);
775 return -1;
776 }
777
778 return 0;
779}
780
781/*
782 * File format:
783 *
784 * struct group_descs {
785 * u32 nr_groups;
786 * struct group_desc {
787 * char name[];
788 * u32 leader_idx;
789 * u32 nr_members;
790 * }[nr_groups];
791 * };
792 */
793static int write_group_desc(int fd, struct perf_header *h __maybe_unused,
794 struct perf_evlist *evlist)
795{
796 u32 nr_groups = evlist->nr_groups;
797 struct perf_evsel *evsel;
798 int ret;
799
800 ret = do_write(fd, &nr_groups, sizeof(nr_groups));
801 if (ret < 0)
802 return ret;
803
804 evlist__for_each(evlist, evsel) {
805 if (perf_evsel__is_group_leader(evsel) &&
806 evsel->nr_members > 1) {
807 const char *name = evsel->group_name ?: "{anon_group}";
808 u32 leader_idx = evsel->idx;
809 u32 nr_members = evsel->nr_members;
810
811 ret = do_write_string(fd, name);
812 if (ret < 0)
813 return ret;
814
815 ret = do_write(fd, &leader_idx, sizeof(leader_idx));
816 if (ret < 0)
817 return ret;
818
819 ret = do_write(fd, &nr_members, sizeof(nr_members));
820 if (ret < 0)
821 return ret;
822 }
823 }
824 return 0;
825}
826
827/*
828 * default get_cpuid(): nothing gets recorded
829 * actual implementation must be in arch/$(ARCH)/util/header.c
830 */
831int __attribute__ ((weak)) get_cpuid(char *buffer __maybe_unused,
832 size_t sz __maybe_unused)
833{
834 return -1;
835}
836
837static int write_cpuid(int fd, struct perf_header *h __maybe_unused,
838 struct perf_evlist *evlist __maybe_unused)
839{
840 char buffer[64];
841 int ret;
842
843 ret = get_cpuid(buffer, sizeof(buffer));
844 if (!ret)
845 goto write_it;
846
847 return -1;
848write_it:
849 return do_write_string(fd, buffer);
850}
851
852static int write_branch_stack(int fd __maybe_unused,
853 struct perf_header *h __maybe_unused,
854 struct perf_evlist *evlist __maybe_unused)
855{
856 return 0;
857}
858
859static int write_auxtrace(int fd, struct perf_header *h,
860 struct perf_evlist *evlist __maybe_unused)
861{
862 struct perf_session *session;
863 int err;
864
865 session = container_of(h, struct perf_session, header);
866
867 err = auxtrace_index__write(fd, &session->auxtrace_index);
868 if (err < 0)
869 pr_err("Failed to write auxtrace index\n");
870 return err;
871}
872
873static int cpu_cache_level__sort(const void *a, const void *b)
874{
875 struct cpu_cache_level *cache_a = (struct cpu_cache_level *)a;
876 struct cpu_cache_level *cache_b = (struct cpu_cache_level *)b;
877
878 return cache_a->level - cache_b->level;
879}
880
881static bool cpu_cache_level__cmp(struct cpu_cache_level *a, struct cpu_cache_level *b)
882{
883 if (a->level != b->level)
884 return false;
885
886 if (a->line_size != b->line_size)
887 return false;
888
889 if (a->sets != b->sets)
890 return false;
891
892 if (a->ways != b->ways)
893 return false;
894
895 if (strcmp(a->type, b->type))
896 return false;
897
898 if (strcmp(a->size, b->size))
899 return false;
900
901 if (strcmp(a->map, b->map))
902 return false;
903
904 return true;
905}
906
907static int cpu_cache_level__read(struct cpu_cache_level *cache, u32 cpu, u16 level)
908{
909 char path[PATH_MAX], file[PATH_MAX];
910 struct stat st;
911 size_t len;
912
913 scnprintf(path, PATH_MAX, "devices/system/cpu/cpu%d/cache/index%d/", cpu, level);
914 scnprintf(file, PATH_MAX, "%s/%s", sysfs__mountpoint(), path);
915
916 if (stat(file, &st))
917 return 1;
918
919 scnprintf(file, PATH_MAX, "%s/level", path);
920 if (sysfs__read_int(file, (int *) &cache->level))
921 return -1;
922
923 scnprintf(file, PATH_MAX, "%s/coherency_line_size", path);
924 if (sysfs__read_int(file, (int *) &cache->line_size))
925 return -1;
926
927 scnprintf(file, PATH_MAX, "%s/number_of_sets", path);
928 if (sysfs__read_int(file, (int *) &cache->sets))
929 return -1;
930
931 scnprintf(file, PATH_MAX, "%s/ways_of_associativity", path);
932 if (sysfs__read_int(file, (int *) &cache->ways))
933 return -1;
934
935 scnprintf(file, PATH_MAX, "%s/type", path);
936 if (sysfs__read_str(file, &cache->type, &len))
937 return -1;
938
939 cache->type[len] = 0;
940 cache->type = rtrim(cache->type);
941
942 scnprintf(file, PATH_MAX, "%s/size", path);
943 if (sysfs__read_str(file, &cache->size, &len)) {
944 free(cache->type);
945 return -1;
946 }
947
948 cache->size[len] = 0;
949 cache->size = rtrim(cache->size);
950
951 scnprintf(file, PATH_MAX, "%s/shared_cpu_list", path);
952 if (sysfs__read_str(file, &cache->map, &len)) {
953 free(cache->map);
954 free(cache->type);
955 return -1;
956 }
957
958 cache->map[len] = 0;
959 cache->map = rtrim(cache->map);
960 return 0;
961}
962
963static void cpu_cache_level__fprintf(FILE *out, struct cpu_cache_level *c)
964{
965 fprintf(out, "L%d %-15s %8s [%s]\n", c->level, c->type, c->size, c->map);
966}
967
968static int build_caches(struct cpu_cache_level caches[], u32 size, u32 *cntp)
969{
970 u32 i, cnt = 0;
971 long ncpus;
972 u32 nr, cpu;
973 u16 level;
974
975 ncpus = sysconf(_SC_NPROCESSORS_CONF);
976 if (ncpus < 0)
977 return -1;
978
979 nr = (u32)(ncpus & UINT_MAX);
980
981 for (cpu = 0; cpu < nr; cpu++) {
982 for (level = 0; level < 10; level++) {
983 struct cpu_cache_level c;
984 int err;
985
986 err = cpu_cache_level__read(&c, cpu, level);
987 if (err < 0)
988 return err;
989
990 if (err == 1)
991 break;
992
993 for (i = 0; i < cnt; i++) {
994 if (cpu_cache_level__cmp(&c, &caches[i]))
995 break;
996 }
997
998 if (i == cnt)
999 caches[cnt++] = c;
1000 else
1001 cpu_cache_level__free(&c);
1002
1003 if (WARN_ONCE(cnt == size, "way too many cpu caches.."))
1004 goto out;
1005 }
1006 }
1007 out:
1008 *cntp = cnt;
1009 return 0;
1010}
1011
1012#define MAX_CACHES 2000
1013
1014static int write_cache(int fd, struct perf_header *h __maybe_unused,
1015 struct perf_evlist *evlist __maybe_unused)
1016{
1017 struct cpu_cache_level caches[MAX_CACHES];
1018 u32 cnt = 0, i, version = 1;
1019 int ret;
1020
1021 ret = build_caches(caches, MAX_CACHES, &cnt);
1022 if (ret)
1023 goto out;
1024
1025 qsort(&caches, cnt, sizeof(struct cpu_cache_level), cpu_cache_level__sort);
1026
1027 ret = do_write(fd, &version, sizeof(u32));
1028 if (ret < 0)
1029 goto out;
1030
1031 ret = do_write(fd, &cnt, sizeof(u32));
1032 if (ret < 0)
1033 goto out;
1034
1035 for (i = 0; i < cnt; i++) {
1036 struct cpu_cache_level *c = &caches[i];
1037
1038 #define _W(v) \
1039 ret = do_write(fd, &c->v, sizeof(u32)); \
1040 if (ret < 0) \
1041 goto out;
1042
1043 _W(level)
1044 _W(line_size)
1045 _W(sets)
1046 _W(ways)
1047 #undef _W
1048
1049 #define _W(v) \
1050 ret = do_write_string(fd, (const char *) c->v); \
1051 if (ret < 0) \
1052 goto out;
1053
1054 _W(type)
1055 _W(size)
1056 _W(map)
1057 #undef _W
1058 }
1059
1060out:
1061 for (i = 0; i < cnt; i++)
1062 cpu_cache_level__free(&caches[i]);
1063 return ret;
1064}
1065
1066static int write_stat(int fd __maybe_unused,
1067 struct perf_header *h __maybe_unused,
1068 struct perf_evlist *evlist __maybe_unused)
1069{
1070 return 0;
1071}
1072
1073static void print_hostname(struct perf_header *ph, int fd __maybe_unused,
1074 FILE *fp)
1075{
1076 fprintf(fp, "# hostname : %s\n", ph->env.hostname);
1077}
1078
1079static void print_osrelease(struct perf_header *ph, int fd __maybe_unused,
1080 FILE *fp)
1081{
1082 fprintf(fp, "# os release : %s\n", ph->env.os_release);
1083}
1084
1085static void print_arch(struct perf_header *ph, int fd __maybe_unused, FILE *fp)
1086{
1087 fprintf(fp, "# arch : %s\n", ph->env.arch);
1088}
1089
1090static void print_cpudesc(struct perf_header *ph, int fd __maybe_unused,
1091 FILE *fp)
1092{
1093 fprintf(fp, "# cpudesc : %s\n", ph->env.cpu_desc);
1094}
1095
1096static void print_nrcpus(struct perf_header *ph, int fd __maybe_unused,
1097 FILE *fp)
1098{
1099 fprintf(fp, "# nrcpus online : %u\n", ph->env.nr_cpus_online);
1100 fprintf(fp, "# nrcpus avail : %u\n", ph->env.nr_cpus_avail);
1101}
1102
1103static void print_version(struct perf_header *ph, int fd __maybe_unused,
1104 FILE *fp)
1105{
1106 fprintf(fp, "# perf version : %s\n", ph->env.version);
1107}
1108
1109static void print_cmdline(struct perf_header *ph, int fd __maybe_unused,
1110 FILE *fp)
1111{
1112 int nr, i;
1113
1114 nr = ph->env.nr_cmdline;
1115
1116 fprintf(fp, "# cmdline : ");
1117
1118 for (i = 0; i < nr; i++)
1119 fprintf(fp, "%s ", ph->env.cmdline_argv[i]);
1120 fputc('\n', fp);
1121}
1122
1123static void print_cpu_topology(struct perf_header *ph, int fd __maybe_unused,
1124 FILE *fp)
1125{
1126 int nr, i;
1127 char *str;
1128 int cpu_nr = ph->env.nr_cpus_online;
1129
1130 nr = ph->env.nr_sibling_cores;
1131 str = ph->env.sibling_cores;
1132
1133 for (i = 0; i < nr; i++) {
1134 fprintf(fp, "# sibling cores : %s\n", str);
1135 str += strlen(str) + 1;
1136 }
1137
1138 nr = ph->env.nr_sibling_threads;
1139 str = ph->env.sibling_threads;
1140
1141 for (i = 0; i < nr; i++) {
1142 fprintf(fp, "# sibling threads : %s\n", str);
1143 str += strlen(str) + 1;
1144 }
1145
1146 if (ph->env.cpu != NULL) {
1147 for (i = 0; i < cpu_nr; i++)
1148 fprintf(fp, "# CPU %d: Core ID %d, Socket ID %d\n", i,
1149 ph->env.cpu[i].core_id, ph->env.cpu[i].socket_id);
1150 } else
1151 fprintf(fp, "# Core ID and Socket ID information is not available\n");
1152}
1153
1154static void free_event_desc(struct perf_evsel *events)
1155{
1156 struct perf_evsel *evsel;
1157
1158 if (!events)
1159 return;
1160
1161 for (evsel = events; evsel->attr.size; evsel++) {
1162 zfree(&evsel->name);
1163 zfree(&evsel->id);
1164 }
1165
1166 free(events);
1167}
1168
1169static struct perf_evsel *
1170read_event_desc(struct perf_header *ph, int fd)
1171{
1172 struct perf_evsel *evsel, *events = NULL;
1173 u64 *id;
1174 void *buf = NULL;
1175 u32 nre, sz, nr, i, j;
1176 ssize_t ret;
1177 size_t msz;
1178
1179 /* number of events */
1180 ret = readn(fd, &nre, sizeof(nre));
1181 if (ret != (ssize_t)sizeof(nre))
1182 goto error;
1183
1184 if (ph->needs_swap)
1185 nre = bswap_32(nre);
1186
1187 ret = readn(fd, &sz, sizeof(sz));
1188 if (ret != (ssize_t)sizeof(sz))
1189 goto error;
1190
1191 if (ph->needs_swap)
1192 sz = bswap_32(sz);
1193
1194 /* buffer to hold on file attr struct */
1195 buf = malloc(sz);
1196 if (!buf)
1197 goto error;
1198
1199 /* the last event terminates with evsel->attr.size == 0: */
1200 events = calloc(nre + 1, sizeof(*events));
1201 if (!events)
1202 goto error;
1203
1204 msz = sizeof(evsel->attr);
1205 if (sz < msz)
1206 msz = sz;
1207
1208 for (i = 0, evsel = events; i < nre; evsel++, i++) {
1209 evsel->idx = i;
1210
1211 /*
1212 * must read entire on-file attr struct to
1213 * sync up with layout.
1214 */
1215 ret = readn(fd, buf, sz);
1216 if (ret != (ssize_t)sz)
1217 goto error;
1218
1219 if (ph->needs_swap)
1220 perf_event__attr_swap(buf);
1221
1222 memcpy(&evsel->attr, buf, msz);
1223
1224 ret = readn(fd, &nr, sizeof(nr));
1225 if (ret != (ssize_t)sizeof(nr))
1226 goto error;
1227
1228 if (ph->needs_swap) {
1229 nr = bswap_32(nr);
1230 evsel->needs_swap = true;
1231 }
1232
1233 evsel->name = do_read_string(fd, ph);
1234
1235 if (!nr)
1236 continue;
1237
1238 id = calloc(nr, sizeof(*id));
1239 if (!id)
1240 goto error;
1241 evsel->ids = nr;
1242 evsel->id = id;
1243
1244 for (j = 0 ; j < nr; j++) {
1245 ret = readn(fd, id, sizeof(*id));
1246 if (ret != (ssize_t)sizeof(*id))
1247 goto error;
1248 if (ph->needs_swap)
1249 *id = bswap_64(*id);
1250 id++;
1251 }
1252 }
1253out:
1254 free(buf);
1255 return events;
1256error:
1257 free_event_desc(events);
1258 events = NULL;
1259 goto out;
1260}
1261
1262static int __desc_attr__fprintf(FILE *fp, const char *name, const char *val,
1263 void *priv __attribute__((unused)))
1264{
1265 return fprintf(fp, ", %s = %s", name, val);
1266}
1267
1268static void print_event_desc(struct perf_header *ph, int fd, FILE *fp)
1269{
1270 struct perf_evsel *evsel, *events = read_event_desc(ph, fd);
1271 u32 j;
1272 u64 *id;
1273
1274 if (!events) {
1275 fprintf(fp, "# event desc: not available or unable to read\n");
1276 return;
1277 }
1278
1279 for (evsel = events; evsel->attr.size; evsel++) {
1280 fprintf(fp, "# event : name = %s, ", evsel->name);
1281
1282 if (evsel->ids) {
1283 fprintf(fp, ", id = {");
1284 for (j = 0, id = evsel->id; j < evsel->ids; j++, id++) {
1285 if (j)
1286 fputc(',', fp);
1287 fprintf(fp, " %"PRIu64, *id);
1288 }
1289 fprintf(fp, " }");
1290 }
1291
1292 perf_event_attr__fprintf(fp, &evsel->attr, __desc_attr__fprintf, NULL);
1293
1294 fputc('\n', fp);
1295 }
1296
1297 free_event_desc(events);
1298}
1299
1300static void print_total_mem(struct perf_header *ph, int fd __maybe_unused,
1301 FILE *fp)
1302{
1303 fprintf(fp, "# total memory : %Lu kB\n", ph->env.total_mem);
1304}
1305
1306static void print_numa_topology(struct perf_header *ph, int fd __maybe_unused,
1307 FILE *fp)
1308{
1309 u32 nr, c, i;
1310 char *str, *tmp;
1311 uint64_t mem_total, mem_free;
1312
1313 /* nr nodes */
1314 nr = ph->env.nr_numa_nodes;
1315 str = ph->env.numa_nodes;
1316
1317 for (i = 0; i < nr; i++) {
1318 /* node number */
1319 c = strtoul(str, &tmp, 0);
1320 if (*tmp != ':')
1321 goto error;
1322
1323 str = tmp + 1;
1324 mem_total = strtoull(str, &tmp, 0);
1325 if (*tmp != ':')
1326 goto error;
1327
1328 str = tmp + 1;
1329 mem_free = strtoull(str, &tmp, 0);
1330 if (*tmp != ':')
1331 goto error;
1332
1333 fprintf(fp, "# node%u meminfo : total = %"PRIu64" kB,"
1334 " free = %"PRIu64" kB\n",
1335 c, mem_total, mem_free);
1336
1337 str = tmp + 1;
1338 fprintf(fp, "# node%u cpu list : %s\n", c, str);
1339
1340 str += strlen(str) + 1;
1341 }
1342 return;
1343error:
1344 fprintf(fp, "# numa topology : not available\n");
1345}
1346
1347static void print_cpuid(struct perf_header *ph, int fd __maybe_unused, FILE *fp)
1348{
1349 fprintf(fp, "# cpuid : %s\n", ph->env.cpuid);
1350}
1351
1352static void print_branch_stack(struct perf_header *ph __maybe_unused,
1353 int fd __maybe_unused, FILE *fp)
1354{
1355 fprintf(fp, "# contains samples with branch stack\n");
1356}
1357
1358static void print_auxtrace(struct perf_header *ph __maybe_unused,
1359 int fd __maybe_unused, FILE *fp)
1360{
1361 fprintf(fp, "# contains AUX area data (e.g. instruction trace)\n");
1362}
1363
1364static void print_stat(struct perf_header *ph __maybe_unused,
1365 int fd __maybe_unused, FILE *fp)
1366{
1367 fprintf(fp, "# contains stat data\n");
1368}
1369
1370static void print_cache(struct perf_header *ph __maybe_unused,
1371 int fd __maybe_unused, FILE *fp __maybe_unused)
1372{
1373 int i;
1374
1375 fprintf(fp, "# CPU cache info:\n");
1376 for (i = 0; i < ph->env.caches_cnt; i++) {
1377 fprintf(fp, "# ");
1378 cpu_cache_level__fprintf(fp, &ph->env.caches[i]);
1379 }
1380}
1381
1382static void print_pmu_mappings(struct perf_header *ph, int fd __maybe_unused,
1383 FILE *fp)
1384{
1385 const char *delimiter = "# pmu mappings: ";
1386 char *str, *tmp;
1387 u32 pmu_num;
1388 u32 type;
1389
1390 pmu_num = ph->env.nr_pmu_mappings;
1391 if (!pmu_num) {
1392 fprintf(fp, "# pmu mappings: not available\n");
1393 return;
1394 }
1395
1396 str = ph->env.pmu_mappings;
1397
1398 while (pmu_num) {
1399 type = strtoul(str, &tmp, 0);
1400 if (*tmp != ':')
1401 goto error;
1402
1403 str = tmp + 1;
1404 fprintf(fp, "%s%s = %" PRIu32, delimiter, str, type);
1405
1406 delimiter = ", ";
1407 str += strlen(str) + 1;
1408 pmu_num--;
1409 }
1410
1411 fprintf(fp, "\n");
1412
1413 if (!pmu_num)
1414 return;
1415error:
1416 fprintf(fp, "# pmu mappings: unable to read\n");
1417}
1418
1419static void print_group_desc(struct perf_header *ph, int fd __maybe_unused,
1420 FILE *fp)
1421{
1422 struct perf_session *session;
1423 struct perf_evsel *evsel;
1424 u32 nr = 0;
1425
1426 session = container_of(ph, struct perf_session, header);
1427
1428 evlist__for_each(session->evlist, evsel) {
1429 if (perf_evsel__is_group_leader(evsel) &&
1430 evsel->nr_members > 1) {
1431 fprintf(fp, "# group: %s{%s", evsel->group_name ?: "",
1432 perf_evsel__name(evsel));
1433
1434 nr = evsel->nr_members - 1;
1435 } else if (nr) {
1436 fprintf(fp, ",%s", perf_evsel__name(evsel));
1437
1438 if (--nr == 0)
1439 fprintf(fp, "}\n");
1440 }
1441 }
1442}
1443
1444static int __event_process_build_id(struct build_id_event *bev,
1445 char *filename,
1446 struct perf_session *session)
1447{
1448 int err = -1;
1449 struct machine *machine;
1450 u16 cpumode;
1451 struct dso *dso;
1452 enum dso_kernel_type dso_type;
1453
1454 machine = perf_session__findnew_machine(session, bev->pid);
1455 if (!machine)
1456 goto out;
1457
1458 cpumode = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1459
1460 switch (cpumode) {
1461 case PERF_RECORD_MISC_KERNEL:
1462 dso_type = DSO_TYPE_KERNEL;
1463 break;
1464 case PERF_RECORD_MISC_GUEST_KERNEL:
1465 dso_type = DSO_TYPE_GUEST_KERNEL;
1466 break;
1467 case PERF_RECORD_MISC_USER:
1468 case PERF_RECORD_MISC_GUEST_USER:
1469 dso_type = DSO_TYPE_USER;
1470 break;
1471 default:
1472 goto out;
1473 }
1474
1475 dso = machine__findnew_dso(machine, filename);
1476 if (dso != NULL) {
1477 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1478
1479 dso__set_build_id(dso, &bev->build_id);
1480
1481 if (!is_kernel_module(filename, cpumode))
1482 dso->kernel = dso_type;
1483
1484 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
1485 sbuild_id);
1486 pr_debug("build id event received for %s: %s\n",
1487 dso->long_name, sbuild_id);
1488 dso__put(dso);
1489 }
1490
1491 err = 0;
1492out:
1493 return err;
1494}
1495
1496static int perf_header__read_build_ids_abi_quirk(struct perf_header *header,
1497 int input, u64 offset, u64 size)
1498{
1499 struct perf_session *session = container_of(header, struct perf_session, header);
1500 struct {
1501 struct perf_event_header header;
1502 u8 build_id[PERF_ALIGN(BUILD_ID_SIZE, sizeof(u64))];
1503 char filename[0];
1504 } old_bev;
1505 struct build_id_event bev;
1506 char filename[PATH_MAX];
1507 u64 limit = offset + size;
1508
1509 while (offset < limit) {
1510 ssize_t len;
1511
1512 if (readn(input, &old_bev, sizeof(old_bev)) != sizeof(old_bev))
1513 return -1;
1514
1515 if (header->needs_swap)
1516 perf_event_header__bswap(&old_bev.header);
1517
1518 len = old_bev.header.size - sizeof(old_bev);
1519 if (readn(input, filename, len) != len)
1520 return -1;
1521
1522 bev.header = old_bev.header;
1523
1524 /*
1525 * As the pid is the missing value, we need to fill
1526 * it properly. The header.misc value give us nice hint.
1527 */
1528 bev.pid = HOST_KERNEL_ID;
1529 if (bev.header.misc == PERF_RECORD_MISC_GUEST_USER ||
1530 bev.header.misc == PERF_RECORD_MISC_GUEST_KERNEL)
1531 bev.pid = DEFAULT_GUEST_KERNEL_ID;
1532
1533 memcpy(bev.build_id, old_bev.build_id, sizeof(bev.build_id));
1534 __event_process_build_id(&bev, filename, session);
1535
1536 offset += bev.header.size;
1537 }
1538
1539 return 0;
1540}
1541
1542static int perf_header__read_build_ids(struct perf_header *header,
1543 int input, u64 offset, u64 size)
1544{
1545 struct perf_session *session = container_of(header, struct perf_session, header);
1546 struct build_id_event bev;
1547 char filename[PATH_MAX];
1548 u64 limit = offset + size, orig_offset = offset;
1549 int err = -1;
1550
1551 while (offset < limit) {
1552 ssize_t len;
1553
1554 if (readn(input, &bev, sizeof(bev)) != sizeof(bev))
1555 goto out;
1556
1557 if (header->needs_swap)
1558 perf_event_header__bswap(&bev.header);
1559
1560 len = bev.header.size - sizeof(bev);
1561 if (readn(input, filename, len) != len)
1562 goto out;
1563 /*
1564 * The a1645ce1 changeset:
1565 *
1566 * "perf: 'perf kvm' tool for monitoring guest performance from host"
1567 *
1568 * Added a field to struct build_id_event that broke the file
1569 * format.
1570 *
1571 * Since the kernel build-id is the first entry, process the
1572 * table using the old format if the well known
1573 * '[kernel.kallsyms]' string for the kernel build-id has the
1574 * first 4 characters chopped off (where the pid_t sits).
1575 */
1576 if (memcmp(filename, "nel.kallsyms]", 13) == 0) {
1577 if (lseek(input, orig_offset, SEEK_SET) == (off_t)-1)
1578 return -1;
1579 return perf_header__read_build_ids_abi_quirk(header, input, offset, size);
1580 }
1581
1582 __event_process_build_id(&bev, filename, session);
1583
1584 offset += bev.header.size;
1585 }
1586 err = 0;
1587out:
1588 return err;
1589}
1590
1591static int process_tracing_data(struct perf_file_section *section __maybe_unused,
1592 struct perf_header *ph __maybe_unused,
1593 int fd, void *data)
1594{
1595 ssize_t ret = trace_report(fd, data, false);
1596 return ret < 0 ? -1 : 0;
1597}
1598
1599static int process_build_id(struct perf_file_section *section,
1600 struct perf_header *ph, int fd,
1601 void *data __maybe_unused)
1602{
1603 if (perf_header__read_build_ids(ph, fd, section->offset, section->size))
1604 pr_debug("Failed to read buildids, continuing...\n");
1605 return 0;
1606}
1607
1608static int process_hostname(struct perf_file_section *section __maybe_unused,
1609 struct perf_header *ph, int fd,
1610 void *data __maybe_unused)
1611{
1612 ph->env.hostname = do_read_string(fd, ph);
1613 return ph->env.hostname ? 0 : -ENOMEM;
1614}
1615
1616static int process_osrelease(struct perf_file_section *section __maybe_unused,
1617 struct perf_header *ph, int fd,
1618 void *data __maybe_unused)
1619{
1620 ph->env.os_release = do_read_string(fd, ph);
1621 return ph->env.os_release ? 0 : -ENOMEM;
1622}
1623
1624static int process_version(struct perf_file_section *section __maybe_unused,
1625 struct perf_header *ph, int fd,
1626 void *data __maybe_unused)
1627{
1628 ph->env.version = do_read_string(fd, ph);
1629 return ph->env.version ? 0 : -ENOMEM;
1630}
1631
1632static int process_arch(struct perf_file_section *section __maybe_unused,
1633 struct perf_header *ph, int fd,
1634 void *data __maybe_unused)
1635{
1636 ph->env.arch = do_read_string(fd, ph);
1637 return ph->env.arch ? 0 : -ENOMEM;
1638}
1639
1640static int process_nrcpus(struct perf_file_section *section __maybe_unused,
1641 struct perf_header *ph, int fd,
1642 void *data __maybe_unused)
1643{
1644 ssize_t ret;
1645 u32 nr;
1646
1647 ret = readn(fd, &nr, sizeof(nr));
1648 if (ret != sizeof(nr))
1649 return -1;
1650
1651 if (ph->needs_swap)
1652 nr = bswap_32(nr);
1653
1654 ph->env.nr_cpus_avail = nr;
1655
1656 ret = readn(fd, &nr, sizeof(nr));
1657 if (ret != sizeof(nr))
1658 return -1;
1659
1660 if (ph->needs_swap)
1661 nr = bswap_32(nr);
1662
1663 ph->env.nr_cpus_online = nr;
1664 return 0;
1665}
1666
1667static int process_cpudesc(struct perf_file_section *section __maybe_unused,
1668 struct perf_header *ph, int fd,
1669 void *data __maybe_unused)
1670{
1671 ph->env.cpu_desc = do_read_string(fd, ph);
1672 return ph->env.cpu_desc ? 0 : -ENOMEM;
1673}
1674
1675static int process_cpuid(struct perf_file_section *section __maybe_unused,
1676 struct perf_header *ph, int fd,
1677 void *data __maybe_unused)
1678{
1679 ph->env.cpuid = do_read_string(fd, ph);
1680 return ph->env.cpuid ? 0 : -ENOMEM;
1681}
1682
1683static int process_total_mem(struct perf_file_section *section __maybe_unused,
1684 struct perf_header *ph, int fd,
1685 void *data __maybe_unused)
1686{
1687 uint64_t mem;
1688 ssize_t ret;
1689
1690 ret = readn(fd, &mem, sizeof(mem));
1691 if (ret != sizeof(mem))
1692 return -1;
1693
1694 if (ph->needs_swap)
1695 mem = bswap_64(mem);
1696
1697 ph->env.total_mem = mem;
1698 return 0;
1699}
1700
1701static struct perf_evsel *
1702perf_evlist__find_by_index(struct perf_evlist *evlist, int idx)
1703{
1704 struct perf_evsel *evsel;
1705
1706 evlist__for_each(evlist, evsel) {
1707 if (evsel->idx == idx)
1708 return evsel;
1709 }
1710
1711 return NULL;
1712}
1713
1714static void
1715perf_evlist__set_event_name(struct perf_evlist *evlist,
1716 struct perf_evsel *event)
1717{
1718 struct perf_evsel *evsel;
1719
1720 if (!event->name)
1721 return;
1722
1723 evsel = perf_evlist__find_by_index(evlist, event->idx);
1724 if (!evsel)
1725 return;
1726
1727 if (evsel->name)
1728 return;
1729
1730 evsel->name = strdup(event->name);
1731}
1732
1733static int
1734process_event_desc(struct perf_file_section *section __maybe_unused,
1735 struct perf_header *header, int fd,
1736 void *data __maybe_unused)
1737{
1738 struct perf_session *session;
1739 struct perf_evsel *evsel, *events = read_event_desc(header, fd);
1740
1741 if (!events)
1742 return 0;
1743
1744 session = container_of(header, struct perf_session, header);
1745 for (evsel = events; evsel->attr.size; evsel++)
1746 perf_evlist__set_event_name(session->evlist, evsel);
1747
1748 free_event_desc(events);
1749
1750 return 0;
1751}
1752
1753static int process_cmdline(struct perf_file_section *section,
1754 struct perf_header *ph, int fd,
1755 void *data __maybe_unused)
1756{
1757 ssize_t ret;
1758 char *str, *cmdline = NULL, **argv = NULL;
1759 u32 nr, i, len = 0;
1760
1761 ret = readn(fd, &nr, sizeof(nr));
1762 if (ret != sizeof(nr))
1763 return -1;
1764
1765 if (ph->needs_swap)
1766 nr = bswap_32(nr);
1767
1768 ph->env.nr_cmdline = nr;
1769
1770 cmdline = zalloc(section->size + nr + 1);
1771 if (!cmdline)
1772 return -1;
1773
1774 argv = zalloc(sizeof(char *) * (nr + 1));
1775 if (!argv)
1776 goto error;
1777
1778 for (i = 0; i < nr; i++) {
1779 str = do_read_string(fd, ph);
1780 if (!str)
1781 goto error;
1782
1783 argv[i] = cmdline + len;
1784 memcpy(argv[i], str, strlen(str) + 1);
1785 len += strlen(str) + 1;
1786 free(str);
1787 }
1788 ph->env.cmdline = cmdline;
1789 ph->env.cmdline_argv = (const char **) argv;
1790 return 0;
1791
1792error:
1793 free(argv);
1794 free(cmdline);
1795 return -1;
1796}
1797
1798static int process_cpu_topology(struct perf_file_section *section,
1799 struct perf_header *ph, int fd,
1800 void *data __maybe_unused)
1801{
1802 ssize_t ret;
1803 u32 nr, i;
1804 char *str;
1805 struct strbuf sb;
1806 int cpu_nr = ph->env.nr_cpus_online;
1807 u64 size = 0;
1808
1809 ph->env.cpu = calloc(cpu_nr, sizeof(*ph->env.cpu));
1810 if (!ph->env.cpu)
1811 return -1;
1812
1813 ret = readn(fd, &nr, sizeof(nr));
1814 if (ret != sizeof(nr))
1815 goto free_cpu;
1816
1817 if (ph->needs_swap)
1818 nr = bswap_32(nr);
1819
1820 ph->env.nr_sibling_cores = nr;
1821 size += sizeof(u32);
1822 strbuf_init(&sb, 128);
1823
1824 for (i = 0; i < nr; i++) {
1825 str = do_read_string(fd, ph);
1826 if (!str)
1827 goto error;
1828
1829 /* include a NULL character at the end */
1830 strbuf_add(&sb, str, strlen(str) + 1);
1831 size += string_size(str);
1832 free(str);
1833 }
1834 ph->env.sibling_cores = strbuf_detach(&sb, NULL);
1835
1836 ret = readn(fd, &nr, sizeof(nr));
1837 if (ret != sizeof(nr))
1838 return -1;
1839
1840 if (ph->needs_swap)
1841 nr = bswap_32(nr);
1842
1843 ph->env.nr_sibling_threads = nr;
1844 size += sizeof(u32);
1845
1846 for (i = 0; i < nr; i++) {
1847 str = do_read_string(fd, ph);
1848 if (!str)
1849 goto error;
1850
1851 /* include a NULL character at the end */
1852 strbuf_add(&sb, str, strlen(str) + 1);
1853 size += string_size(str);
1854 free(str);
1855 }
1856 ph->env.sibling_threads = strbuf_detach(&sb, NULL);
1857
1858 /*
1859 * The header may be from old perf,
1860 * which doesn't include core id and socket id information.
1861 */
1862 if (section->size <= size) {
1863 zfree(&ph->env.cpu);
1864 return 0;
1865 }
1866
1867 for (i = 0; i < (u32)cpu_nr; i++) {
1868 ret = readn(fd, &nr, sizeof(nr));
1869 if (ret != sizeof(nr))
1870 goto free_cpu;
1871
1872 if (ph->needs_swap)
1873 nr = bswap_32(nr);
1874
1875 ph->env.cpu[i].core_id = nr;
1876
1877 ret = readn(fd, &nr, sizeof(nr));
1878 if (ret != sizeof(nr))
1879 goto free_cpu;
1880
1881 if (ph->needs_swap)
1882 nr = bswap_32(nr);
1883
1884 if (nr > (u32)cpu_nr) {
1885 pr_debug("socket_id number is too big."
1886 "You may need to upgrade the perf tool.\n");
1887 goto free_cpu;
1888 }
1889
1890 ph->env.cpu[i].socket_id = nr;
1891 }
1892
1893 return 0;
1894
1895error:
1896 strbuf_release(&sb);
1897free_cpu:
1898 zfree(&ph->env.cpu);
1899 return -1;
1900}
1901
1902static int process_numa_topology(struct perf_file_section *section __maybe_unused,
1903 struct perf_header *ph, int fd,
1904 void *data __maybe_unused)
1905{
1906 ssize_t ret;
1907 u32 nr, node, i;
1908 char *str;
1909 uint64_t mem_total, mem_free;
1910 struct strbuf sb;
1911
1912 /* nr nodes */
1913 ret = readn(fd, &nr, sizeof(nr));
1914 if (ret != sizeof(nr))
1915 goto error;
1916
1917 if (ph->needs_swap)
1918 nr = bswap_32(nr);
1919
1920 ph->env.nr_numa_nodes = nr;
1921 strbuf_init(&sb, 256);
1922
1923 for (i = 0; i < nr; i++) {
1924 /* node number */
1925 ret = readn(fd, &node, sizeof(node));
1926 if (ret != sizeof(node))
1927 goto error;
1928
1929 ret = readn(fd, &mem_total, sizeof(u64));
1930 if (ret != sizeof(u64))
1931 goto error;
1932
1933 ret = readn(fd, &mem_free, sizeof(u64));
1934 if (ret != sizeof(u64))
1935 goto error;
1936
1937 if (ph->needs_swap) {
1938 node = bswap_32(node);
1939 mem_total = bswap_64(mem_total);
1940 mem_free = bswap_64(mem_free);
1941 }
1942
1943 strbuf_addf(&sb, "%u:%"PRIu64":%"PRIu64":",
1944 node, mem_total, mem_free);
1945
1946 str = do_read_string(fd, ph);
1947 if (!str)
1948 goto error;
1949
1950 /* include a NULL character at the end */
1951 strbuf_add(&sb, str, strlen(str) + 1);
1952 free(str);
1953 }
1954 ph->env.numa_nodes = strbuf_detach(&sb, NULL);
1955 return 0;
1956
1957error:
1958 strbuf_release(&sb);
1959 return -1;
1960}
1961
1962static int process_pmu_mappings(struct perf_file_section *section __maybe_unused,
1963 struct perf_header *ph, int fd,
1964 void *data __maybe_unused)
1965{
1966 ssize_t ret;
1967 char *name;
1968 u32 pmu_num;
1969 u32 type;
1970 struct strbuf sb;
1971
1972 ret = readn(fd, &pmu_num, sizeof(pmu_num));
1973 if (ret != sizeof(pmu_num))
1974 return -1;
1975
1976 if (ph->needs_swap)
1977 pmu_num = bswap_32(pmu_num);
1978
1979 if (!pmu_num) {
1980 pr_debug("pmu mappings not available\n");
1981 return 0;
1982 }
1983
1984 ph->env.nr_pmu_mappings = pmu_num;
1985 strbuf_init(&sb, 128);
1986
1987 while (pmu_num) {
1988 if (readn(fd, &type, sizeof(type)) != sizeof(type))
1989 goto error;
1990 if (ph->needs_swap)
1991 type = bswap_32(type);
1992
1993 name = do_read_string(fd, ph);
1994 if (!name)
1995 goto error;
1996
1997 strbuf_addf(&sb, "%u:%s", type, name);
1998 /* include a NULL character at the end */
1999 strbuf_add(&sb, "", 1);
2000
2001 if (!strcmp(name, "msr"))
2002 ph->env.msr_pmu_type = type;
2003
2004 free(name);
2005 pmu_num--;
2006 }
2007 ph->env.pmu_mappings = strbuf_detach(&sb, NULL);
2008 return 0;
2009
2010error:
2011 strbuf_release(&sb);
2012 return -1;
2013}
2014
2015static int process_group_desc(struct perf_file_section *section __maybe_unused,
2016 struct perf_header *ph, int fd,
2017 void *data __maybe_unused)
2018{
2019 size_t ret = -1;
2020 u32 i, nr, nr_groups;
2021 struct perf_session *session;
2022 struct perf_evsel *evsel, *leader = NULL;
2023 struct group_desc {
2024 char *name;
2025 u32 leader_idx;
2026 u32 nr_members;
2027 } *desc;
2028
2029 if (readn(fd, &nr_groups, sizeof(nr_groups)) != sizeof(nr_groups))
2030 return -1;
2031
2032 if (ph->needs_swap)
2033 nr_groups = bswap_32(nr_groups);
2034
2035 ph->env.nr_groups = nr_groups;
2036 if (!nr_groups) {
2037 pr_debug("group desc not available\n");
2038 return 0;
2039 }
2040
2041 desc = calloc(nr_groups, sizeof(*desc));
2042 if (!desc)
2043 return -1;
2044
2045 for (i = 0; i < nr_groups; i++) {
2046 desc[i].name = do_read_string(fd, ph);
2047 if (!desc[i].name)
2048 goto out_free;
2049
2050 if (readn(fd, &desc[i].leader_idx, sizeof(u32)) != sizeof(u32))
2051 goto out_free;
2052
2053 if (readn(fd, &desc[i].nr_members, sizeof(u32)) != sizeof(u32))
2054 goto out_free;
2055
2056 if (ph->needs_swap) {
2057 desc[i].leader_idx = bswap_32(desc[i].leader_idx);
2058 desc[i].nr_members = bswap_32(desc[i].nr_members);
2059 }
2060 }
2061
2062 /*
2063 * Rebuild group relationship based on the group_desc
2064 */
2065 session = container_of(ph, struct perf_session, header);
2066 session->evlist->nr_groups = nr_groups;
2067
2068 i = nr = 0;
2069 evlist__for_each(session->evlist, evsel) {
2070 if (evsel->idx == (int) desc[i].leader_idx) {
2071 evsel->leader = evsel;
2072 /* {anon_group} is a dummy name */
2073 if (strcmp(desc[i].name, "{anon_group}")) {
2074 evsel->group_name = desc[i].name;
2075 desc[i].name = NULL;
2076 }
2077 evsel->nr_members = desc[i].nr_members;
2078
2079 if (i >= nr_groups || nr > 0) {
2080 pr_debug("invalid group desc\n");
2081 goto out_free;
2082 }
2083
2084 leader = evsel;
2085 nr = evsel->nr_members - 1;
2086 i++;
2087 } else if (nr) {
2088 /* This is a group member */
2089 evsel->leader = leader;
2090
2091 nr--;
2092 }
2093 }
2094
2095 if (i != nr_groups || nr != 0) {
2096 pr_debug("invalid group desc\n");
2097 goto out_free;
2098 }
2099
2100 ret = 0;
2101out_free:
2102 for (i = 0; i < nr_groups; i++)
2103 zfree(&desc[i].name);
2104 free(desc);
2105
2106 return ret;
2107}
2108
2109static int process_auxtrace(struct perf_file_section *section,
2110 struct perf_header *ph, int fd,
2111 void *data __maybe_unused)
2112{
2113 struct perf_session *session;
2114 int err;
2115
2116 session = container_of(ph, struct perf_session, header);
2117
2118 err = auxtrace_index__process(fd, section->size, session,
2119 ph->needs_swap);
2120 if (err < 0)
2121 pr_err("Failed to process auxtrace index\n");
2122 return err;
2123}
2124
2125static int process_cache(struct perf_file_section *section __maybe_unused,
2126 struct perf_header *ph __maybe_unused, int fd __maybe_unused,
2127 void *data __maybe_unused)
2128{
2129 struct cpu_cache_level *caches;
2130 u32 cnt, i, version;
2131
2132 if (readn(fd, &version, sizeof(version)) != sizeof(version))
2133 return -1;
2134
2135 if (ph->needs_swap)
2136 version = bswap_32(version);
2137
2138 if (version != 1)
2139 return -1;
2140
2141 if (readn(fd, &cnt, sizeof(cnt)) != sizeof(cnt))
2142 return -1;
2143
2144 if (ph->needs_swap)
2145 cnt = bswap_32(cnt);
2146
2147 caches = zalloc(sizeof(*caches) * cnt);
2148 if (!caches)
2149 return -1;
2150
2151 for (i = 0; i < cnt; i++) {
2152 struct cpu_cache_level c;
2153
2154 #define _R(v) \
2155 if (readn(fd, &c.v, sizeof(u32)) != sizeof(u32))\
2156 goto out_free_caches; \
2157 if (ph->needs_swap) \
2158 c.v = bswap_32(c.v); \
2159
2160 _R(level)
2161 _R(line_size)
2162 _R(sets)
2163 _R(ways)
2164 #undef _R
2165
2166 #define _R(v) \
2167 c.v = do_read_string(fd, ph); \
2168 if (!c.v) \
2169 goto out_free_caches;
2170
2171 _R(type)
2172 _R(size)
2173 _R(map)
2174 #undef _R
2175
2176 caches[i] = c;
2177 }
2178
2179 ph->env.caches = caches;
2180 ph->env.caches_cnt = cnt;
2181 return 0;
2182out_free_caches:
2183 free(caches);
2184 return -1;
2185}
2186
2187struct feature_ops {
2188 int (*write)(int fd, struct perf_header *h, struct perf_evlist *evlist);
2189 void (*print)(struct perf_header *h, int fd, FILE *fp);
2190 int (*process)(struct perf_file_section *section,
2191 struct perf_header *h, int fd, void *data);
2192 const char *name;
2193 bool full_only;
2194};
2195
2196#define FEAT_OPA(n, func) \
2197 [n] = { .name = #n, .write = write_##func, .print = print_##func }
2198#define FEAT_OPP(n, func) \
2199 [n] = { .name = #n, .write = write_##func, .print = print_##func, \
2200 .process = process_##func }
2201#define FEAT_OPF(n, func) \
2202 [n] = { .name = #n, .write = write_##func, .print = print_##func, \
2203 .process = process_##func, .full_only = true }
2204
2205/* feature_ops not implemented: */
2206#define print_tracing_data NULL
2207#define print_build_id NULL
2208
2209static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
2210 FEAT_OPP(HEADER_TRACING_DATA, tracing_data),
2211 FEAT_OPP(HEADER_BUILD_ID, build_id),
2212 FEAT_OPP(HEADER_HOSTNAME, hostname),
2213 FEAT_OPP(HEADER_OSRELEASE, osrelease),
2214 FEAT_OPP(HEADER_VERSION, version),
2215 FEAT_OPP(HEADER_ARCH, arch),
2216 FEAT_OPP(HEADER_NRCPUS, nrcpus),
2217 FEAT_OPP(HEADER_CPUDESC, cpudesc),
2218 FEAT_OPP(HEADER_CPUID, cpuid),
2219 FEAT_OPP(HEADER_TOTAL_MEM, total_mem),
2220 FEAT_OPP(HEADER_EVENT_DESC, event_desc),
2221 FEAT_OPP(HEADER_CMDLINE, cmdline),
2222 FEAT_OPF(HEADER_CPU_TOPOLOGY, cpu_topology),
2223 FEAT_OPF(HEADER_NUMA_TOPOLOGY, numa_topology),
2224 FEAT_OPA(HEADER_BRANCH_STACK, branch_stack),
2225 FEAT_OPP(HEADER_PMU_MAPPINGS, pmu_mappings),
2226 FEAT_OPP(HEADER_GROUP_DESC, group_desc),
2227 FEAT_OPP(HEADER_AUXTRACE, auxtrace),
2228 FEAT_OPA(HEADER_STAT, stat),
2229 FEAT_OPF(HEADER_CACHE, cache),
2230};
2231
2232struct header_print_data {
2233 FILE *fp;
2234 bool full; /* extended list of headers */
2235};
2236
2237static int perf_file_section__fprintf_info(struct perf_file_section *section,
2238 struct perf_header *ph,
2239 int feat, int fd, void *data)
2240{
2241 struct header_print_data *hd = data;
2242
2243 if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
2244 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
2245 "%d, continuing...\n", section->offset, feat);
2246 return 0;
2247 }
2248 if (feat >= HEADER_LAST_FEATURE) {
2249 pr_warning("unknown feature %d\n", feat);
2250 return 0;
2251 }
2252 if (!feat_ops[feat].print)
2253 return 0;
2254
2255 if (!feat_ops[feat].full_only || hd->full)
2256 feat_ops[feat].print(ph, fd, hd->fp);
2257 else
2258 fprintf(hd->fp, "# %s info available, use -I to display\n",
2259 feat_ops[feat].name);
2260
2261 return 0;
2262}
2263
2264int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
2265{
2266 struct header_print_data hd;
2267 struct perf_header *header = &session->header;
2268 int fd = perf_data_file__fd(session->file);
2269 hd.fp = fp;
2270 hd.full = full;
2271
2272 perf_header__process_sections(header, fd, &hd,
2273 perf_file_section__fprintf_info);
2274 return 0;
2275}
2276
2277static int do_write_feat(int fd, struct perf_header *h, int type,
2278 struct perf_file_section **p,
2279 struct perf_evlist *evlist)
2280{
2281 int err;
2282 int ret = 0;
2283
2284 if (perf_header__has_feat(h, type)) {
2285 if (!feat_ops[type].write)
2286 return -1;
2287
2288 (*p)->offset = lseek(fd, 0, SEEK_CUR);
2289
2290 err = feat_ops[type].write(fd, h, evlist);
2291 if (err < 0) {
2292 pr_debug("failed to write feature %d\n", type);
2293
2294 /* undo anything written */
2295 lseek(fd, (*p)->offset, SEEK_SET);
2296
2297 return -1;
2298 }
2299 (*p)->size = lseek(fd, 0, SEEK_CUR) - (*p)->offset;
2300 (*p)++;
2301 }
2302 return ret;
2303}
2304
2305static int perf_header__adds_write(struct perf_header *header,
2306 struct perf_evlist *evlist, int fd)
2307{
2308 int nr_sections;
2309 struct perf_file_section *feat_sec, *p;
2310 int sec_size;
2311 u64 sec_start;
2312 int feat;
2313 int err;
2314
2315 nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
2316 if (!nr_sections)
2317 return 0;
2318
2319 feat_sec = p = calloc(nr_sections, sizeof(*feat_sec));
2320 if (feat_sec == NULL)
2321 return -ENOMEM;
2322
2323 sec_size = sizeof(*feat_sec) * nr_sections;
2324
2325 sec_start = header->feat_offset;
2326 lseek(fd, sec_start + sec_size, SEEK_SET);
2327
2328 for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
2329 if (do_write_feat(fd, header, feat, &p, evlist))
2330 perf_header__clear_feat(header, feat);
2331 }
2332
2333 lseek(fd, sec_start, SEEK_SET);
2334 /*
2335 * may write more than needed due to dropped feature, but
2336 * this is okay, reader will skip the mising entries
2337 */
2338 err = do_write(fd, feat_sec, sec_size);
2339 if (err < 0)
2340 pr_debug("failed to write feature section\n");
2341 free(feat_sec);
2342 return err;
2343}
2344
2345int perf_header__write_pipe(int fd)
2346{
2347 struct perf_pipe_file_header f_header;
2348 int err;
2349
2350 f_header = (struct perf_pipe_file_header){
2351 .magic = PERF_MAGIC,
2352 .size = sizeof(f_header),
2353 };
2354
2355 err = do_write(fd, &f_header, sizeof(f_header));
2356 if (err < 0) {
2357 pr_debug("failed to write perf pipe header\n");
2358 return err;
2359 }
2360
2361 return 0;
2362}
2363
2364int perf_session__write_header(struct perf_session *session,
2365 struct perf_evlist *evlist,
2366 int fd, bool at_exit)
2367{
2368 struct perf_file_header f_header;
2369 struct perf_file_attr f_attr;
2370 struct perf_header *header = &session->header;
2371 struct perf_evsel *evsel;
2372 u64 attr_offset;
2373 int err;
2374
2375 lseek(fd, sizeof(f_header), SEEK_SET);
2376
2377 evlist__for_each(session->evlist, evsel) {
2378 evsel->id_offset = lseek(fd, 0, SEEK_CUR);
2379 err = do_write(fd, evsel->id, evsel->ids * sizeof(u64));
2380 if (err < 0) {
2381 pr_debug("failed to write perf header\n");
2382 return err;
2383 }
2384 }
2385
2386 attr_offset = lseek(fd, 0, SEEK_CUR);
2387
2388 evlist__for_each(evlist, evsel) {
2389 f_attr = (struct perf_file_attr){
2390 .attr = evsel->attr,
2391 .ids = {
2392 .offset = evsel->id_offset,
2393 .size = evsel->ids * sizeof(u64),
2394 }
2395 };
2396 err = do_write(fd, &f_attr, sizeof(f_attr));
2397 if (err < 0) {
2398 pr_debug("failed to write perf header attribute\n");
2399 return err;
2400 }
2401 }
2402
2403 if (!header->data_offset)
2404 header->data_offset = lseek(fd, 0, SEEK_CUR);
2405 header->feat_offset = header->data_offset + header->data_size;
2406
2407 if (at_exit) {
2408 err = perf_header__adds_write(header, evlist, fd);
2409 if (err < 0)
2410 return err;
2411 }
2412
2413 f_header = (struct perf_file_header){
2414 .magic = PERF_MAGIC,
2415 .size = sizeof(f_header),
2416 .attr_size = sizeof(f_attr),
2417 .attrs = {
2418 .offset = attr_offset,
2419 .size = evlist->nr_entries * sizeof(f_attr),
2420 },
2421 .data = {
2422 .offset = header->data_offset,
2423 .size = header->data_size,
2424 },
2425 /* event_types is ignored, store zeros */
2426 };
2427
2428 memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));
2429
2430 lseek(fd, 0, SEEK_SET);
2431 err = do_write(fd, &f_header, sizeof(f_header));
2432 if (err < 0) {
2433 pr_debug("failed to write perf header\n");
2434 return err;
2435 }
2436 lseek(fd, header->data_offset + header->data_size, SEEK_SET);
2437
2438 return 0;
2439}
2440
2441static int perf_header__getbuffer64(struct perf_header *header,
2442 int fd, void *buf, size_t size)
2443{
2444 if (readn(fd, buf, size) <= 0)
2445 return -1;
2446
2447 if (header->needs_swap)
2448 mem_bswap_64(buf, size);
2449
2450 return 0;
2451}
2452
2453int perf_header__process_sections(struct perf_header *header, int fd,
2454 void *data,
2455 int (*process)(struct perf_file_section *section,
2456 struct perf_header *ph,
2457 int feat, int fd, void *data))
2458{
2459 struct perf_file_section *feat_sec, *sec;
2460 int nr_sections;
2461 int sec_size;
2462 int feat;
2463 int err;
2464
2465 nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
2466 if (!nr_sections)
2467 return 0;
2468
2469 feat_sec = sec = calloc(nr_sections, sizeof(*feat_sec));
2470 if (!feat_sec)
2471 return -1;
2472
2473 sec_size = sizeof(*feat_sec) * nr_sections;
2474
2475 lseek(fd, header->feat_offset, SEEK_SET);
2476
2477 err = perf_header__getbuffer64(header, fd, feat_sec, sec_size);
2478 if (err < 0)
2479 goto out_free;
2480
2481 for_each_set_bit(feat, header->adds_features, HEADER_LAST_FEATURE) {
2482 err = process(sec++, header, feat, fd, data);
2483 if (err < 0)
2484 goto out_free;
2485 }
2486 err = 0;
2487out_free:
2488 free(feat_sec);
2489 return err;
2490}
2491
2492static const int attr_file_abi_sizes[] = {
2493 [0] = PERF_ATTR_SIZE_VER0,
2494 [1] = PERF_ATTR_SIZE_VER1,
2495 [2] = PERF_ATTR_SIZE_VER2,
2496 [3] = PERF_ATTR_SIZE_VER3,
2497 [4] = PERF_ATTR_SIZE_VER4,
2498 0,
2499};
2500
2501/*
2502 * In the legacy file format, the magic number is not used to encode endianness.
2503 * hdr_sz was used to encode endianness. But given that hdr_sz can vary based
2504 * on ABI revisions, we need to try all combinations for all endianness to
2505 * detect the endianness.
2506 */
2507static int try_all_file_abis(uint64_t hdr_sz, struct perf_header *ph)
2508{
2509 uint64_t ref_size, attr_size;
2510 int i;
2511
2512 for (i = 0 ; attr_file_abi_sizes[i]; i++) {
2513 ref_size = attr_file_abi_sizes[i]
2514 + sizeof(struct perf_file_section);
2515 if (hdr_sz != ref_size) {
2516 attr_size = bswap_64(hdr_sz);
2517 if (attr_size != ref_size)
2518 continue;
2519
2520 ph->needs_swap = true;
2521 }
2522 pr_debug("ABI%d perf.data file detected, need_swap=%d\n",
2523 i,
2524 ph->needs_swap);
2525 return 0;
2526 }
2527 /* could not determine endianness */
2528 return -1;
2529}
2530
2531#define PERF_PIPE_HDR_VER0 16
2532
2533static const size_t attr_pipe_abi_sizes[] = {
2534 [0] = PERF_PIPE_HDR_VER0,
2535 0,
2536};
2537
2538/*
2539 * In the legacy pipe format, there is an implicit assumption that endiannesss
2540 * between host recording the samples, and host parsing the samples is the
2541 * same. This is not always the case given that the pipe output may always be
2542 * redirected into a file and analyzed on a different machine with possibly a
2543 * different endianness and perf_event ABI revsions in the perf tool itself.
2544 */
2545static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph)
2546{
2547 u64 attr_size;
2548 int i;
2549
2550 for (i = 0 ; attr_pipe_abi_sizes[i]; i++) {
2551 if (hdr_sz != attr_pipe_abi_sizes[i]) {
2552 attr_size = bswap_64(hdr_sz);
2553 if (attr_size != hdr_sz)
2554 continue;
2555
2556 ph->needs_swap = true;
2557 }
2558 pr_debug("Pipe ABI%d perf.data file detected\n", i);
2559 return 0;
2560 }
2561 return -1;
2562}
2563
2564bool is_perf_magic(u64 magic)
2565{
2566 if (!memcmp(&magic, __perf_magic1, sizeof(magic))
2567 || magic == __perf_magic2
2568 || magic == __perf_magic2_sw)
2569 return true;
2570
2571 return false;
2572}
2573
2574static int check_magic_endian(u64 magic, uint64_t hdr_sz,
2575 bool is_pipe, struct perf_header *ph)
2576{
2577 int ret;
2578
2579 /* check for legacy format */
2580 ret = memcmp(&magic, __perf_magic1, sizeof(magic));
2581 if (ret == 0) {
2582 ph->version = PERF_HEADER_VERSION_1;
2583 pr_debug("legacy perf.data format\n");
2584 if (is_pipe)
2585 return try_all_pipe_abis(hdr_sz, ph);
2586
2587 return try_all_file_abis(hdr_sz, ph);
2588 }
2589 /*
2590 * the new magic number serves two purposes:
2591 * - unique number to identify actual perf.data files
2592 * - encode endianness of file
2593 */
2594 ph->version = PERF_HEADER_VERSION_2;
2595
2596 /* check magic number with one endianness */
2597 if (magic == __perf_magic2)
2598 return 0;
2599
2600 /* check magic number with opposite endianness */
2601 if (magic != __perf_magic2_sw)
2602 return -1;
2603
2604 ph->needs_swap = true;
2605
2606 return 0;
2607}
2608
2609int perf_file_header__read(struct perf_file_header *header,
2610 struct perf_header *ph, int fd)
2611{
2612 ssize_t ret;
2613
2614 lseek(fd, 0, SEEK_SET);
2615
2616 ret = readn(fd, header, sizeof(*header));
2617 if (ret <= 0)
2618 return -1;
2619
2620 if (check_magic_endian(header->magic,
2621 header->attr_size, false, ph) < 0) {
2622 pr_debug("magic/endian check failed\n");
2623 return -1;
2624 }
2625
2626 if (ph->needs_swap) {
2627 mem_bswap_64(header, offsetof(struct perf_file_header,
2628 adds_features));
2629 }
2630
2631 if (header->size != sizeof(*header)) {
2632 /* Support the previous format */
2633 if (header->size == offsetof(typeof(*header), adds_features))
2634 bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
2635 else
2636 return -1;
2637 } else if (ph->needs_swap) {
2638 /*
2639 * feature bitmap is declared as an array of unsigned longs --
2640 * not good since its size can differ between the host that
2641 * generated the data file and the host analyzing the file.
2642 *
2643 * We need to handle endianness, but we don't know the size of
2644 * the unsigned long where the file was generated. Take a best
2645 * guess at determining it: try 64-bit swap first (ie., file
2646 * created on a 64-bit host), and check if the hostname feature
2647 * bit is set (this feature bit is forced on as of fbe96f2).
2648 * If the bit is not, undo the 64-bit swap and try a 32-bit
2649 * swap. If the hostname bit is still not set (e.g., older data
2650 * file), punt and fallback to the original behavior --
2651 * clearing all feature bits and setting buildid.
2652 */
2653 mem_bswap_64(&header->adds_features,
2654 BITS_TO_U64(HEADER_FEAT_BITS));
2655
2656 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
2657 /* unswap as u64 */
2658 mem_bswap_64(&header->adds_features,
2659 BITS_TO_U64(HEADER_FEAT_BITS));
2660
2661 /* unswap as u32 */
2662 mem_bswap_32(&header->adds_features,
2663 BITS_TO_U32(HEADER_FEAT_BITS));
2664 }
2665
2666 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
2667 bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
2668 set_bit(HEADER_BUILD_ID, header->adds_features);
2669 }
2670 }
2671
2672 memcpy(&ph->adds_features, &header->adds_features,
2673 sizeof(ph->adds_features));
2674
2675 ph->data_offset = header->data.offset;
2676 ph->data_size = header->data.size;
2677 ph->feat_offset = header->data.offset + header->data.size;
2678 return 0;
2679}
2680
2681static int perf_file_section__process(struct perf_file_section *section,
2682 struct perf_header *ph,
2683 int feat, int fd, void *data)
2684{
2685 if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
2686 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
2687 "%d, continuing...\n", section->offset, feat);
2688 return 0;
2689 }
2690
2691 if (feat >= HEADER_LAST_FEATURE) {
2692 pr_debug("unknown feature %d, continuing...\n", feat);
2693 return 0;
2694 }
2695
2696 if (!feat_ops[feat].process)
2697 return 0;
2698
2699 return feat_ops[feat].process(section, ph, fd, data);
2700}
2701
2702static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
2703 struct perf_header *ph, int fd,
2704 bool repipe)
2705{
2706 ssize_t ret;
2707
2708 ret = readn(fd, header, sizeof(*header));
2709 if (ret <= 0)
2710 return -1;
2711
2712 if (check_magic_endian(header->magic, header->size, true, ph) < 0) {
2713 pr_debug("endian/magic failed\n");
2714 return -1;
2715 }
2716
2717 if (ph->needs_swap)
2718 header->size = bswap_64(header->size);
2719
2720 if (repipe && do_write(STDOUT_FILENO, header, sizeof(*header)) < 0)
2721 return -1;
2722
2723 return 0;
2724}
2725
2726static int perf_header__read_pipe(struct perf_session *session)
2727{
2728 struct perf_header *header = &session->header;
2729 struct perf_pipe_file_header f_header;
2730
2731 if (perf_file_header__read_pipe(&f_header, header,
2732 perf_data_file__fd(session->file),
2733 session->repipe) < 0) {
2734 pr_debug("incompatible file format\n");
2735 return -EINVAL;
2736 }
2737
2738 return 0;
2739}
2740
2741static int read_attr(int fd, struct perf_header *ph,
2742 struct perf_file_attr *f_attr)
2743{
2744 struct perf_event_attr *attr = &f_attr->attr;
2745 size_t sz, left;
2746 size_t our_sz = sizeof(f_attr->attr);
2747 ssize_t ret;
2748
2749 memset(f_attr, 0, sizeof(*f_attr));
2750
2751 /* read minimal guaranteed structure */
2752 ret = readn(fd, attr, PERF_ATTR_SIZE_VER0);
2753 if (ret <= 0) {
2754 pr_debug("cannot read %d bytes of header attr\n",
2755 PERF_ATTR_SIZE_VER0);
2756 return -1;
2757 }
2758
2759 /* on file perf_event_attr size */
2760 sz = attr->size;
2761
2762 if (ph->needs_swap)
2763 sz = bswap_32(sz);
2764
2765 if (sz == 0) {
2766 /* assume ABI0 */
2767 sz = PERF_ATTR_SIZE_VER0;
2768 } else if (sz > our_sz) {
2769 pr_debug("file uses a more recent and unsupported ABI"
2770 " (%zu bytes extra)\n", sz - our_sz);
2771 return -1;
2772 }
2773 /* what we have not yet read and that we know about */
2774 left = sz - PERF_ATTR_SIZE_VER0;
2775 if (left) {
2776 void *ptr = attr;
2777 ptr += PERF_ATTR_SIZE_VER0;
2778
2779 ret = readn(fd, ptr, left);
2780 }
2781 /* read perf_file_section, ids are read in caller */
2782 ret = readn(fd, &f_attr->ids, sizeof(f_attr->ids));
2783
2784 return ret <= 0 ? -1 : 0;
2785}
2786
2787static int perf_evsel__prepare_tracepoint_event(struct perf_evsel *evsel,
2788 struct pevent *pevent)
2789{
2790 struct event_format *event;
2791 char bf[128];
2792
2793 /* already prepared */
2794 if (evsel->tp_format)
2795 return 0;
2796
2797 if (pevent == NULL) {
2798 pr_debug("broken or missing trace data\n");
2799 return -1;
2800 }
2801
2802 event = pevent_find_event(pevent, evsel->attr.config);
2803 if (event == NULL)
2804 return -1;
2805
2806 if (!evsel->name) {
2807 snprintf(bf, sizeof(bf), "%s:%s", event->system, event->name);
2808 evsel->name = strdup(bf);
2809 if (evsel->name == NULL)
2810 return -1;
2811 }
2812
2813 evsel->tp_format = event;
2814 return 0;
2815}
2816
2817static int perf_evlist__prepare_tracepoint_events(struct perf_evlist *evlist,
2818 struct pevent *pevent)
2819{
2820 struct perf_evsel *pos;
2821
2822 evlist__for_each(evlist, pos) {
2823 if (pos->attr.type == PERF_TYPE_TRACEPOINT &&
2824 perf_evsel__prepare_tracepoint_event(pos, pevent))
2825 return -1;
2826 }
2827
2828 return 0;
2829}
2830
2831int perf_session__read_header(struct perf_session *session)
2832{
2833 struct perf_data_file *file = session->file;
2834 struct perf_header *header = &session->header;
2835 struct perf_file_header f_header;
2836 struct perf_file_attr f_attr;
2837 u64 f_id;
2838 int nr_attrs, nr_ids, i, j;
2839 int fd = perf_data_file__fd(file);
2840
2841 session->evlist = perf_evlist__new();
2842 if (session->evlist == NULL)
2843 return -ENOMEM;
2844
2845 session->evlist->env = &header->env;
2846 session->machines.host.env = &header->env;
2847 if (perf_data_file__is_pipe(file))
2848 return perf_header__read_pipe(session);
2849
2850 if (perf_file_header__read(&f_header, header, fd) < 0)
2851 return -EINVAL;
2852
2853 /*
2854 * Sanity check that perf.data was written cleanly; data size is
2855 * initialized to 0 and updated only if the on_exit function is run.
2856 * If data size is still 0 then the file contains only partial
2857 * information. Just warn user and process it as much as it can.
2858 */
2859 if (f_header.data.size == 0) {
2860 pr_warning("WARNING: The %s file's data size field is 0 which is unexpected.\n"
2861 "Was the 'perf record' command properly terminated?\n",
2862 file->path);
2863 }
2864
2865 nr_attrs = f_header.attrs.size / f_header.attr_size;
2866 lseek(fd, f_header.attrs.offset, SEEK_SET);
2867
2868 for (i = 0; i < nr_attrs; i++) {
2869 struct perf_evsel *evsel;
2870 off_t tmp;
2871
2872 if (read_attr(fd, header, &f_attr) < 0)
2873 goto out_errno;
2874
2875 if (header->needs_swap) {
2876 f_attr.ids.size = bswap_64(f_attr.ids.size);
2877 f_attr.ids.offset = bswap_64(f_attr.ids.offset);
2878 perf_event__attr_swap(&f_attr.attr);
2879 }
2880
2881 tmp = lseek(fd, 0, SEEK_CUR);
2882 evsel = perf_evsel__new(&f_attr.attr);
2883
2884 if (evsel == NULL)
2885 goto out_delete_evlist;
2886
2887 evsel->needs_swap = header->needs_swap;
2888 /*
2889 * Do it before so that if perf_evsel__alloc_id fails, this
2890 * entry gets purged too at perf_evlist__delete().
2891 */
2892 perf_evlist__add(session->evlist, evsel);
2893
2894 nr_ids = f_attr.ids.size / sizeof(u64);
2895 /*
2896 * We don't have the cpu and thread maps on the header, so
2897 * for allocating the perf_sample_id table we fake 1 cpu and
2898 * hattr->ids threads.
2899 */
2900 if (perf_evsel__alloc_id(evsel, 1, nr_ids))
2901 goto out_delete_evlist;
2902
2903 lseek(fd, f_attr.ids.offset, SEEK_SET);
2904
2905 for (j = 0; j < nr_ids; j++) {
2906 if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))
2907 goto out_errno;
2908
2909 perf_evlist__id_add(session->evlist, evsel, 0, j, f_id);
2910 }
2911
2912 lseek(fd, tmp, SEEK_SET);
2913 }
2914
2915 symbol_conf.nr_events = nr_attrs;
2916
2917 perf_header__process_sections(header, fd, &session->tevent,
2918 perf_file_section__process);
2919
2920 if (perf_evlist__prepare_tracepoint_events(session->evlist,
2921 session->tevent.pevent))
2922 goto out_delete_evlist;
2923
2924 return 0;
2925out_errno:
2926 return -errno;
2927
2928out_delete_evlist:
2929 perf_evlist__delete(session->evlist);
2930 session->evlist = NULL;
2931 return -ENOMEM;
2932}
2933
2934int perf_event__synthesize_attr(struct perf_tool *tool,
2935 struct perf_event_attr *attr, u32 ids, u64 *id,
2936 perf_event__handler_t process)
2937{
2938 union perf_event *ev;
2939 size_t size;
2940 int err;
2941
2942 size = sizeof(struct perf_event_attr);
2943 size = PERF_ALIGN(size, sizeof(u64));
2944 size += sizeof(struct perf_event_header);
2945 size += ids * sizeof(u64);
2946
2947 ev = malloc(size);
2948
2949 if (ev == NULL)
2950 return -ENOMEM;
2951
2952 ev->attr.attr = *attr;
2953 memcpy(ev->attr.id, id, ids * sizeof(u64));
2954
2955 ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2956 ev->attr.header.size = (u16)size;
2957
2958 if (ev->attr.header.size == size)
2959 err = process(tool, ev, NULL, NULL);
2960 else
2961 err = -E2BIG;
2962
2963 free(ev);
2964
2965 return err;
2966}
2967
2968static struct event_update_event *
2969event_update_event__new(size_t size, u64 type, u64 id)
2970{
2971 struct event_update_event *ev;
2972
2973 size += sizeof(*ev);
2974 size = PERF_ALIGN(size, sizeof(u64));
2975
2976 ev = zalloc(size);
2977 if (ev) {
2978 ev->header.type = PERF_RECORD_EVENT_UPDATE;
2979 ev->header.size = (u16)size;
2980 ev->type = type;
2981 ev->id = id;
2982 }
2983 return ev;
2984}
2985
2986int
2987perf_event__synthesize_event_update_unit(struct perf_tool *tool,
2988 struct perf_evsel *evsel,
2989 perf_event__handler_t process)
2990{
2991 struct event_update_event *ev;
2992 size_t size = strlen(evsel->unit);
2993 int err;
2994
2995 ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->id[0]);
2996 if (ev == NULL)
2997 return -ENOMEM;
2998
2999 strncpy(ev->data, evsel->unit, size);
3000 err = process(tool, (union perf_event *)ev, NULL, NULL);
3001 free(ev);
3002 return err;
3003}
3004
3005int
3006perf_event__synthesize_event_update_scale(struct perf_tool *tool,
3007 struct perf_evsel *evsel,
3008 perf_event__handler_t process)
3009{
3010 struct event_update_event *ev;
3011 struct event_update_event_scale *ev_data;
3012 int err;
3013
3014 ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->id[0]);
3015 if (ev == NULL)
3016 return -ENOMEM;
3017
3018 ev_data = (struct event_update_event_scale *) ev->data;
3019 ev_data->scale = evsel->scale;
3020 err = process(tool, (union perf_event*) ev, NULL, NULL);
3021 free(ev);
3022 return err;
3023}
3024
3025int
3026perf_event__synthesize_event_update_name(struct perf_tool *tool,
3027 struct perf_evsel *evsel,
3028 perf_event__handler_t process)
3029{
3030 struct event_update_event *ev;
3031 size_t len = strlen(evsel->name);
3032 int err;
3033
3034 ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->id[0]);
3035 if (ev == NULL)
3036 return -ENOMEM;
3037
3038 strncpy(ev->data, evsel->name, len);
3039 err = process(tool, (union perf_event*) ev, NULL, NULL);
3040 free(ev);
3041 return err;
3042}
3043
3044int
3045perf_event__synthesize_event_update_cpus(struct perf_tool *tool,
3046 struct perf_evsel *evsel,
3047 perf_event__handler_t process)
3048{
3049 size_t size = sizeof(struct event_update_event);
3050 struct event_update_event *ev;
3051 int max, err;
3052 u16 type;
3053
3054 if (!evsel->own_cpus)
3055 return 0;
3056
3057 ev = cpu_map_data__alloc(evsel->own_cpus, &size, &type, &max);
3058 if (!ev)
3059 return -ENOMEM;
3060
3061 ev->header.type = PERF_RECORD_EVENT_UPDATE;
3062 ev->header.size = (u16)size;
3063 ev->type = PERF_EVENT_UPDATE__CPUS;
3064 ev->id = evsel->id[0];
3065
3066 cpu_map_data__synthesize((struct cpu_map_data *) ev->data,
3067 evsel->own_cpus,
3068 type, max);
3069
3070 err = process(tool, (union perf_event*) ev, NULL, NULL);
3071 free(ev);
3072 return err;
3073}
3074
3075size_t perf_event__fprintf_event_update(union perf_event *event, FILE *fp)
3076{
3077 struct event_update_event *ev = &event->event_update;
3078 struct event_update_event_scale *ev_scale;
3079 struct event_update_event_cpus *ev_cpus;
3080 struct cpu_map *map;
3081 size_t ret;
3082
3083 ret = fprintf(fp, "\n... id: %" PRIu64 "\n", ev->id);
3084
3085 switch (ev->type) {
3086 case PERF_EVENT_UPDATE__SCALE:
3087 ev_scale = (struct event_update_event_scale *) ev->data;
3088 ret += fprintf(fp, "... scale: %f\n", ev_scale->scale);
3089 break;
3090 case PERF_EVENT_UPDATE__UNIT:
3091 ret += fprintf(fp, "... unit: %s\n", ev->data);
3092 break;
3093 case PERF_EVENT_UPDATE__NAME:
3094 ret += fprintf(fp, "... name: %s\n", ev->data);
3095 break;
3096 case PERF_EVENT_UPDATE__CPUS:
3097 ev_cpus = (struct event_update_event_cpus *) ev->data;
3098 ret += fprintf(fp, "... ");
3099
3100 map = cpu_map__new_data(&ev_cpus->cpus);
3101 if (map)
3102 ret += cpu_map__fprintf(map, fp);
3103 else
3104 ret += fprintf(fp, "failed to get cpus\n");
3105 break;
3106 default:
3107 ret += fprintf(fp, "... unknown type\n");
3108 break;
3109 }
3110
3111 return ret;
3112}
3113
3114int perf_event__synthesize_attrs(struct perf_tool *tool,
3115 struct perf_session *session,
3116 perf_event__handler_t process)
3117{
3118 struct perf_evsel *evsel;
3119 int err = 0;
3120
3121 evlist__for_each(session->evlist, evsel) {
3122 err = perf_event__synthesize_attr(tool, &evsel->attr, evsel->ids,
3123 evsel->id, process);
3124 if (err) {
3125 pr_debug("failed to create perf header attribute\n");
3126 return err;
3127 }
3128 }
3129
3130 return err;
3131}
3132
3133int perf_event__process_attr(struct perf_tool *tool __maybe_unused,
3134 union perf_event *event,
3135 struct perf_evlist **pevlist)
3136{
3137 u32 i, ids, n_ids;
3138 struct perf_evsel *evsel;
3139 struct perf_evlist *evlist = *pevlist;
3140
3141 if (evlist == NULL) {
3142 *pevlist = evlist = perf_evlist__new();
3143 if (evlist == NULL)
3144 return -ENOMEM;
3145 }
3146
3147 evsel = perf_evsel__new(&event->attr.attr);
3148 if (evsel == NULL)
3149 return -ENOMEM;
3150
3151 perf_evlist__add(evlist, evsel);
3152
3153 ids = event->header.size;
3154 ids -= (void *)&event->attr.id - (void *)event;
3155 n_ids = ids / sizeof(u64);
3156 /*
3157 * We don't have the cpu and thread maps on the header, so
3158 * for allocating the perf_sample_id table we fake 1 cpu and
3159 * hattr->ids threads.
3160 */
3161 if (perf_evsel__alloc_id(evsel, 1, n_ids))
3162 return -ENOMEM;
3163
3164 for (i = 0; i < n_ids; i++) {
3165 perf_evlist__id_add(evlist, evsel, 0, i, event->attr.id[i]);
3166 }
3167
3168 symbol_conf.nr_events = evlist->nr_entries;
3169
3170 return 0;
3171}
3172
3173int perf_event__process_event_update(struct perf_tool *tool __maybe_unused,
3174 union perf_event *event,
3175 struct perf_evlist **pevlist)
3176{
3177 struct event_update_event *ev = &event->event_update;
3178 struct event_update_event_scale *ev_scale;
3179 struct event_update_event_cpus *ev_cpus;
3180 struct perf_evlist *evlist;
3181 struct perf_evsel *evsel;
3182 struct cpu_map *map;
3183
3184 if (!pevlist || *pevlist == NULL)
3185 return -EINVAL;
3186
3187 evlist = *pevlist;
3188
3189 evsel = perf_evlist__id2evsel(evlist, ev->id);
3190 if (evsel == NULL)
3191 return -EINVAL;
3192
3193 switch (ev->type) {
3194 case PERF_EVENT_UPDATE__UNIT:
3195 evsel->unit = strdup(ev->data);
3196 break;
3197 case PERF_EVENT_UPDATE__NAME:
3198 evsel->name = strdup(ev->data);
3199 break;
3200 case PERF_EVENT_UPDATE__SCALE:
3201 ev_scale = (struct event_update_event_scale *) ev->data;
3202 evsel->scale = ev_scale->scale;
3203 case PERF_EVENT_UPDATE__CPUS:
3204 ev_cpus = (struct event_update_event_cpus *) ev->data;
3205
3206 map = cpu_map__new_data(&ev_cpus->cpus);
3207 if (map)
3208 evsel->own_cpus = map;
3209 else
3210 pr_err("failed to get event_update cpus\n");
3211 default:
3212 break;
3213 }
3214
3215 return 0;
3216}
3217
3218int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd,
3219 struct perf_evlist *evlist,
3220 perf_event__handler_t process)
3221{
3222 union perf_event ev;
3223 struct tracing_data *tdata;
3224 ssize_t size = 0, aligned_size = 0, padding;
3225 int err __maybe_unused = 0;
3226
3227 /*
3228 * We are going to store the size of the data followed
3229 * by the data contents. Since the fd descriptor is a pipe,
3230 * we cannot seek back to store the size of the data once
3231 * we know it. Instead we:
3232 *
3233 * - write the tracing data to the temp file
3234 * - get/write the data size to pipe
3235 * - write the tracing data from the temp file
3236 * to the pipe
3237 */
3238 tdata = tracing_data_get(&evlist->entries, fd, true);
3239 if (!tdata)
3240 return -1;
3241
3242 memset(&ev, 0, sizeof(ev));
3243
3244 ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
3245 size = tdata->size;
3246 aligned_size = PERF_ALIGN(size, sizeof(u64));
3247 padding = aligned_size - size;
3248 ev.tracing_data.header.size = sizeof(ev.tracing_data);
3249 ev.tracing_data.size = aligned_size;
3250
3251 process(tool, &ev, NULL, NULL);
3252
3253 /*
3254 * The put function will copy all the tracing data
3255 * stored in temp file to the pipe.
3256 */
3257 tracing_data_put(tdata);
3258
3259 write_padded(fd, NULL, 0, padding);
3260
3261 return aligned_size;
3262}
3263
3264int perf_event__process_tracing_data(struct perf_tool *tool __maybe_unused,
3265 union perf_event *event,
3266 struct perf_session *session)
3267{
3268 ssize_t size_read, padding, size = event->tracing_data.size;
3269 int fd = perf_data_file__fd(session->file);
3270 off_t offset = lseek(fd, 0, SEEK_CUR);
3271 char buf[BUFSIZ];
3272
3273 /* setup for reading amidst mmap */
3274 lseek(fd, offset + sizeof(struct tracing_data_event),
3275 SEEK_SET);
3276
3277 size_read = trace_report(fd, &session->tevent,
3278 session->repipe);
3279 padding = PERF_ALIGN(size_read, sizeof(u64)) - size_read;
3280
3281 if (readn(fd, buf, padding) < 0) {
3282 pr_err("%s: reading input file", __func__);
3283 return -1;
3284 }
3285 if (session->repipe) {
3286 int retw = write(STDOUT_FILENO, buf, padding);
3287 if (retw <= 0 || retw != padding) {
3288 pr_err("%s: repiping tracing data padding", __func__);
3289 return -1;
3290 }
3291 }
3292
3293 if (size_read + padding != size) {
3294 pr_err("%s: tracing data size mismatch", __func__);
3295 return -1;
3296 }
3297
3298 perf_evlist__prepare_tracepoint_events(session->evlist,
3299 session->tevent.pevent);
3300
3301 return size_read + padding;
3302}
3303
3304int perf_event__synthesize_build_id(struct perf_tool *tool,
3305 struct dso *pos, u16 misc,
3306 perf_event__handler_t process,
3307 struct machine *machine)
3308{
3309 union perf_event ev;
3310 size_t len;
3311 int err = 0;
3312
3313 if (!pos->hit)
3314 return err;
3315
3316 memset(&ev, 0, sizeof(ev));
3317
3318 len = pos->long_name_len + 1;
3319 len = PERF_ALIGN(len, NAME_ALIGN);
3320 memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
3321 ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
3322 ev.build_id.header.misc = misc;
3323 ev.build_id.pid = machine->pid;
3324 ev.build_id.header.size = sizeof(ev.build_id) + len;
3325 memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
3326
3327 err = process(tool, &ev, NULL, machine);
3328
3329 return err;
3330}
3331
3332int perf_event__process_build_id(struct perf_tool *tool __maybe_unused,
3333 union perf_event *event,
3334 struct perf_session *session)
3335{
3336 __event_process_build_id(&event->build_id,
3337 event->build_id.filename,
3338 session);
3339 return 0;
3340}
1#define _FILE_OFFSET_BITS 64
2
3#include <sys/types.h>
4#include <byteswap.h>
5#include <unistd.h>
6#include <stdio.h>
7#include <stdlib.h>
8#include <linux/list.h>
9#include <linux/kernel.h>
10
11#include "evlist.h"
12#include "evsel.h"
13#include "util.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
21static bool no_buildid_cache = false;
22
23static int event_count;
24static struct perf_trace_event_type *events;
25
26int perf_header__push_event(u64 id, const char *name)
27{
28 if (strlen(name) > MAX_EVENT_NAME)
29 pr_warning("Event %s will be truncated\n", name);
30
31 if (!events) {
32 events = malloc(sizeof(struct perf_trace_event_type));
33 if (events == NULL)
34 return -ENOMEM;
35 } else {
36 struct perf_trace_event_type *nevents;
37
38 nevents = realloc(events, (event_count + 1) * sizeof(*events));
39 if (nevents == NULL)
40 return -ENOMEM;
41 events = nevents;
42 }
43 memset(&events[event_count], 0, sizeof(struct perf_trace_event_type));
44 events[event_count].event_id = id;
45 strncpy(events[event_count].name, name, MAX_EVENT_NAME - 1);
46 event_count++;
47 return 0;
48}
49
50char *perf_header__find_event(u64 id)
51{
52 int i;
53 for (i = 0 ; i < event_count; i++) {
54 if (events[i].event_id == id)
55 return events[i].name;
56 }
57 return NULL;
58}
59
60static const char *__perf_magic = "PERFFILE";
61
62#define PERF_MAGIC (*(u64 *)__perf_magic)
63
64struct perf_file_attr {
65 struct perf_event_attr attr;
66 struct perf_file_section ids;
67};
68
69void perf_header__set_feat(struct perf_header *header, int feat)
70{
71 set_bit(feat, header->adds_features);
72}
73
74void perf_header__clear_feat(struct perf_header *header, int feat)
75{
76 clear_bit(feat, header->adds_features);
77}
78
79bool perf_header__has_feat(const struct perf_header *header, int feat)
80{
81 return test_bit(feat, header->adds_features);
82}
83
84static int do_write(int fd, const void *buf, size_t size)
85{
86 while (size) {
87 int ret = write(fd, buf, size);
88
89 if (ret < 0)
90 return -errno;
91
92 size -= ret;
93 buf += ret;
94 }
95
96 return 0;
97}
98
99#define NAME_ALIGN 64
100
101static int write_padded(int fd, const void *bf, size_t count,
102 size_t count_aligned)
103{
104 static const char zero_buf[NAME_ALIGN];
105 int err = do_write(fd, bf, count);
106
107 if (!err)
108 err = do_write(fd, zero_buf, count_aligned - count);
109
110 return err;
111}
112
113#define dsos__for_each_with_build_id(pos, head) \
114 list_for_each_entry(pos, head, node) \
115 if (!pos->has_build_id) \
116 continue; \
117 else
118
119static int __dsos__write_buildid_table(struct list_head *head, pid_t pid,
120 u16 misc, int fd)
121{
122 struct dso *pos;
123
124 dsos__for_each_with_build_id(pos, head) {
125 int err;
126 struct build_id_event b;
127 size_t len;
128
129 if (!pos->hit)
130 continue;
131 len = pos->long_name_len + 1;
132 len = ALIGN(len, NAME_ALIGN);
133 memset(&b, 0, sizeof(b));
134 memcpy(&b.build_id, pos->build_id, sizeof(pos->build_id));
135 b.pid = pid;
136 b.header.misc = misc;
137 b.header.size = sizeof(b) + len;
138 err = do_write(fd, &b, sizeof(b));
139 if (err < 0)
140 return err;
141 err = write_padded(fd, pos->long_name,
142 pos->long_name_len + 1, len);
143 if (err < 0)
144 return err;
145 }
146
147 return 0;
148}
149
150static int machine__write_buildid_table(struct machine *machine, int fd)
151{
152 int err;
153 u16 kmisc = PERF_RECORD_MISC_KERNEL,
154 umisc = PERF_RECORD_MISC_USER;
155
156 if (!machine__is_host(machine)) {
157 kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
158 umisc = PERF_RECORD_MISC_GUEST_USER;
159 }
160
161 err = __dsos__write_buildid_table(&machine->kernel_dsos, machine->pid,
162 kmisc, fd);
163 if (err == 0)
164 err = __dsos__write_buildid_table(&machine->user_dsos,
165 machine->pid, umisc, fd);
166 return err;
167}
168
169static int dsos__write_buildid_table(struct perf_header *header, int fd)
170{
171 struct perf_session *session = container_of(header,
172 struct perf_session, header);
173 struct rb_node *nd;
174 int err = machine__write_buildid_table(&session->host_machine, fd);
175
176 if (err)
177 return err;
178
179 for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
180 struct machine *pos = rb_entry(nd, struct machine, rb_node);
181 err = machine__write_buildid_table(pos, fd);
182 if (err)
183 break;
184 }
185 return err;
186}
187
188int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
189 const char *name, bool is_kallsyms)
190{
191 const size_t size = PATH_MAX;
192 char *realname, *filename = zalloc(size),
193 *linkname = zalloc(size), *targetname;
194 int len, err = -1;
195
196 if (is_kallsyms) {
197 if (symbol_conf.kptr_restrict) {
198 pr_debug("Not caching a kptr_restrict'ed /proc/kallsyms\n");
199 return 0;
200 }
201 realname = (char *)name;
202 } else
203 realname = realpath(name, NULL);
204
205 if (realname == NULL || filename == NULL || linkname == NULL)
206 goto out_free;
207
208 len = snprintf(filename, size, "%s%s%s",
209 debugdir, is_kallsyms ? "/" : "", realname);
210 if (mkdir_p(filename, 0755))
211 goto out_free;
212
213 snprintf(filename + len, sizeof(filename) - len, "/%s", sbuild_id);
214
215 if (access(filename, F_OK)) {
216 if (is_kallsyms) {
217 if (copyfile("/proc/kallsyms", filename))
218 goto out_free;
219 } else if (link(realname, filename) && copyfile(name, filename))
220 goto out_free;
221 }
222
223 len = snprintf(linkname, size, "%s/.build-id/%.2s",
224 debugdir, sbuild_id);
225
226 if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
227 goto out_free;
228
229 snprintf(linkname + len, size - len, "/%s", sbuild_id + 2);
230 targetname = filename + strlen(debugdir) - 5;
231 memcpy(targetname, "../..", 5);
232
233 if (symlink(targetname, linkname) == 0)
234 err = 0;
235out_free:
236 if (!is_kallsyms)
237 free(realname);
238 free(filename);
239 free(linkname);
240 return err;
241}
242
243static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
244 const char *name, const char *debugdir,
245 bool is_kallsyms)
246{
247 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
248
249 build_id__sprintf(build_id, build_id_size, sbuild_id);
250
251 return build_id_cache__add_s(sbuild_id, debugdir, name, is_kallsyms);
252}
253
254int build_id_cache__remove_s(const char *sbuild_id, const char *debugdir)
255{
256 const size_t size = PATH_MAX;
257 char *filename = zalloc(size),
258 *linkname = zalloc(size);
259 int err = -1;
260
261 if (filename == NULL || linkname == NULL)
262 goto out_free;
263
264 snprintf(linkname, size, "%s/.build-id/%.2s/%s",
265 debugdir, sbuild_id, sbuild_id + 2);
266
267 if (access(linkname, F_OK))
268 goto out_free;
269
270 if (readlink(linkname, filename, size) < 0)
271 goto out_free;
272
273 if (unlink(linkname))
274 goto out_free;
275
276 /*
277 * Since the link is relative, we must make it absolute:
278 */
279 snprintf(linkname, size, "%s/.build-id/%.2s/%s",
280 debugdir, sbuild_id, filename);
281
282 if (unlink(linkname))
283 goto out_free;
284
285 err = 0;
286out_free:
287 free(filename);
288 free(linkname);
289 return err;
290}
291
292static int dso__cache_build_id(struct dso *dso, const char *debugdir)
293{
294 bool is_kallsyms = dso->kernel && dso->long_name[0] != '/';
295
296 return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id),
297 dso->long_name, debugdir, is_kallsyms);
298}
299
300static int __dsos__cache_build_ids(struct list_head *head, const char *debugdir)
301{
302 struct dso *pos;
303 int err = 0;
304
305 dsos__for_each_with_build_id(pos, head)
306 if (dso__cache_build_id(pos, debugdir))
307 err = -1;
308
309 return err;
310}
311
312static int machine__cache_build_ids(struct machine *machine, const char *debugdir)
313{
314 int ret = __dsos__cache_build_ids(&machine->kernel_dsos, debugdir);
315 ret |= __dsos__cache_build_ids(&machine->user_dsos, debugdir);
316 return ret;
317}
318
319static int perf_session__cache_build_ids(struct perf_session *session)
320{
321 struct rb_node *nd;
322 int ret;
323 char debugdir[PATH_MAX];
324
325 snprintf(debugdir, sizeof(debugdir), "%s", buildid_dir);
326
327 if (mkdir(debugdir, 0755) != 0 && errno != EEXIST)
328 return -1;
329
330 ret = machine__cache_build_ids(&session->host_machine, debugdir);
331
332 for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
333 struct machine *pos = rb_entry(nd, struct machine, rb_node);
334 ret |= machine__cache_build_ids(pos, debugdir);
335 }
336 return ret ? -1 : 0;
337}
338
339static bool machine__read_build_ids(struct machine *machine, bool with_hits)
340{
341 bool ret = __dsos__read_build_ids(&machine->kernel_dsos, with_hits);
342 ret |= __dsos__read_build_ids(&machine->user_dsos, with_hits);
343 return ret;
344}
345
346static bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
347{
348 struct rb_node *nd;
349 bool ret = machine__read_build_ids(&session->host_machine, with_hits);
350
351 for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
352 struct machine *pos = rb_entry(nd, struct machine, rb_node);
353 ret |= machine__read_build_ids(pos, with_hits);
354 }
355
356 return ret;
357}
358
359static int perf_header__adds_write(struct perf_header *header,
360 struct perf_evlist *evlist, int fd)
361{
362 int nr_sections;
363 struct perf_session *session;
364 struct perf_file_section *feat_sec;
365 int sec_size;
366 u64 sec_start;
367 int idx = 0, err;
368
369 session = container_of(header, struct perf_session, header);
370
371 if (perf_header__has_feat(header, HEADER_BUILD_ID &&
372 !perf_session__read_build_ids(session, true)))
373 perf_header__clear_feat(header, HEADER_BUILD_ID);
374
375 nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
376 if (!nr_sections)
377 return 0;
378
379 feat_sec = calloc(sizeof(*feat_sec), nr_sections);
380 if (feat_sec == NULL)
381 return -ENOMEM;
382
383 sec_size = sizeof(*feat_sec) * nr_sections;
384
385 sec_start = header->data_offset + header->data_size;
386 lseek(fd, sec_start + sec_size, SEEK_SET);
387
388 if (perf_header__has_feat(header, HEADER_TRACE_INFO)) {
389 struct perf_file_section *trace_sec;
390
391 trace_sec = &feat_sec[idx++];
392
393 /* Write trace info */
394 trace_sec->offset = lseek(fd, 0, SEEK_CUR);
395 read_tracing_data(fd, &evlist->entries);
396 trace_sec->size = lseek(fd, 0, SEEK_CUR) - trace_sec->offset;
397 }
398
399 if (perf_header__has_feat(header, HEADER_BUILD_ID)) {
400 struct perf_file_section *buildid_sec;
401
402 buildid_sec = &feat_sec[idx++];
403
404 /* Write build-ids */
405 buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
406 err = dsos__write_buildid_table(header, fd);
407 if (err < 0) {
408 pr_debug("failed to write buildid table\n");
409 goto out_free;
410 }
411 buildid_sec->size = lseek(fd, 0, SEEK_CUR) -
412 buildid_sec->offset;
413 if (!no_buildid_cache)
414 perf_session__cache_build_ids(session);
415 }
416
417 lseek(fd, sec_start, SEEK_SET);
418 err = do_write(fd, feat_sec, sec_size);
419 if (err < 0)
420 pr_debug("failed to write feature section\n");
421out_free:
422 free(feat_sec);
423 return err;
424}
425
426int perf_header__write_pipe(int fd)
427{
428 struct perf_pipe_file_header f_header;
429 int err;
430
431 f_header = (struct perf_pipe_file_header){
432 .magic = PERF_MAGIC,
433 .size = sizeof(f_header),
434 };
435
436 err = do_write(fd, &f_header, sizeof(f_header));
437 if (err < 0) {
438 pr_debug("failed to write perf pipe header\n");
439 return err;
440 }
441
442 return 0;
443}
444
445int perf_session__write_header(struct perf_session *session,
446 struct perf_evlist *evlist,
447 int fd, bool at_exit)
448{
449 struct perf_file_header f_header;
450 struct perf_file_attr f_attr;
451 struct perf_header *header = &session->header;
452 struct perf_evsel *attr, *pair = NULL;
453 int err;
454
455 lseek(fd, sizeof(f_header), SEEK_SET);
456
457 if (session->evlist != evlist)
458 pair = list_entry(session->evlist->entries.next, struct perf_evsel, node);
459
460 list_for_each_entry(attr, &evlist->entries, node) {
461 attr->id_offset = lseek(fd, 0, SEEK_CUR);
462 err = do_write(fd, attr->id, attr->ids * sizeof(u64));
463 if (err < 0) {
464out_err_write:
465 pr_debug("failed to write perf header\n");
466 return err;
467 }
468 if (session->evlist != evlist) {
469 err = do_write(fd, pair->id, pair->ids * sizeof(u64));
470 if (err < 0)
471 goto out_err_write;
472 attr->ids += pair->ids;
473 pair = list_entry(pair->node.next, struct perf_evsel, node);
474 }
475 }
476
477 header->attr_offset = lseek(fd, 0, SEEK_CUR);
478
479 list_for_each_entry(attr, &evlist->entries, node) {
480 f_attr = (struct perf_file_attr){
481 .attr = attr->attr,
482 .ids = {
483 .offset = attr->id_offset,
484 .size = attr->ids * sizeof(u64),
485 }
486 };
487 err = do_write(fd, &f_attr, sizeof(f_attr));
488 if (err < 0) {
489 pr_debug("failed to write perf header attribute\n");
490 return err;
491 }
492 }
493
494 header->event_offset = lseek(fd, 0, SEEK_CUR);
495 header->event_size = event_count * sizeof(struct perf_trace_event_type);
496 if (events) {
497 err = do_write(fd, events, header->event_size);
498 if (err < 0) {
499 pr_debug("failed to write perf header events\n");
500 return err;
501 }
502 }
503
504 header->data_offset = lseek(fd, 0, SEEK_CUR);
505
506 if (at_exit) {
507 err = perf_header__adds_write(header, evlist, fd);
508 if (err < 0)
509 return err;
510 }
511
512 f_header = (struct perf_file_header){
513 .magic = PERF_MAGIC,
514 .size = sizeof(f_header),
515 .attr_size = sizeof(f_attr),
516 .attrs = {
517 .offset = header->attr_offset,
518 .size = evlist->nr_entries * sizeof(f_attr),
519 },
520 .data = {
521 .offset = header->data_offset,
522 .size = header->data_size,
523 },
524 .event_types = {
525 .offset = header->event_offset,
526 .size = header->event_size,
527 },
528 };
529
530 memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));
531
532 lseek(fd, 0, SEEK_SET);
533 err = do_write(fd, &f_header, sizeof(f_header));
534 if (err < 0) {
535 pr_debug("failed to write perf header\n");
536 return err;
537 }
538 lseek(fd, header->data_offset + header->data_size, SEEK_SET);
539
540 header->frozen = 1;
541 return 0;
542}
543
544static int perf_header__getbuffer64(struct perf_header *header,
545 int fd, void *buf, size_t size)
546{
547 if (readn(fd, buf, size) <= 0)
548 return -1;
549
550 if (header->needs_swap)
551 mem_bswap_64(buf, size);
552
553 return 0;
554}
555
556int perf_header__process_sections(struct perf_header *header, int fd,
557 int (*process)(struct perf_file_section *section,
558 struct perf_header *ph,
559 int feat, int fd))
560{
561 struct perf_file_section *feat_sec;
562 int nr_sections;
563 int sec_size;
564 int idx = 0;
565 int err = -1, feat = 1;
566
567 nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
568 if (!nr_sections)
569 return 0;
570
571 feat_sec = calloc(sizeof(*feat_sec), nr_sections);
572 if (!feat_sec)
573 return -1;
574
575 sec_size = sizeof(*feat_sec) * nr_sections;
576
577 lseek(fd, header->data_offset + header->data_size, SEEK_SET);
578
579 if (perf_header__getbuffer64(header, fd, feat_sec, sec_size))
580 goto out_free;
581
582 err = 0;
583 while (idx < nr_sections && feat < HEADER_LAST_FEATURE) {
584 if (perf_header__has_feat(header, feat)) {
585 struct perf_file_section *sec = &feat_sec[idx++];
586
587 err = process(sec, header, feat, fd);
588 if (err < 0)
589 break;
590 }
591 ++feat;
592 }
593out_free:
594 free(feat_sec);
595 return err;
596}
597
598int perf_file_header__read(struct perf_file_header *header,
599 struct perf_header *ph, int fd)
600{
601 lseek(fd, 0, SEEK_SET);
602
603 if (readn(fd, header, sizeof(*header)) <= 0 ||
604 memcmp(&header->magic, __perf_magic, sizeof(header->magic)))
605 return -1;
606
607 if (header->attr_size != sizeof(struct perf_file_attr)) {
608 u64 attr_size = bswap_64(header->attr_size);
609
610 if (attr_size != sizeof(struct perf_file_attr))
611 return -1;
612
613 mem_bswap_64(header, offsetof(struct perf_file_header,
614 adds_features));
615 ph->needs_swap = true;
616 }
617
618 if (header->size != sizeof(*header)) {
619 /* Support the previous format */
620 if (header->size == offsetof(typeof(*header), adds_features))
621 bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
622 else
623 return -1;
624 }
625
626 memcpy(&ph->adds_features, &header->adds_features,
627 sizeof(ph->adds_features));
628 /*
629 * FIXME: hack that assumes that if we need swap the perf.data file
630 * may be coming from an arch with a different word-size, ergo different
631 * DEFINE_BITMAP format, investigate more later, but for now its mostly
632 * safe to assume that we have a build-id section. Trace files probably
633 * have several other issues in this realm anyway...
634 */
635 if (ph->needs_swap) {
636 memset(&ph->adds_features, 0, sizeof(ph->adds_features));
637 perf_header__set_feat(ph, HEADER_BUILD_ID);
638 }
639
640 ph->event_offset = header->event_types.offset;
641 ph->event_size = header->event_types.size;
642 ph->data_offset = header->data.offset;
643 ph->data_size = header->data.size;
644 return 0;
645}
646
647static int __event_process_build_id(struct build_id_event *bev,
648 char *filename,
649 struct perf_session *session)
650{
651 int err = -1;
652 struct list_head *head;
653 struct machine *machine;
654 u16 misc;
655 struct dso *dso;
656 enum dso_kernel_type dso_type;
657
658 machine = perf_session__findnew_machine(session, bev->pid);
659 if (!machine)
660 goto out;
661
662 misc = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
663
664 switch (misc) {
665 case PERF_RECORD_MISC_KERNEL:
666 dso_type = DSO_TYPE_KERNEL;
667 head = &machine->kernel_dsos;
668 break;
669 case PERF_RECORD_MISC_GUEST_KERNEL:
670 dso_type = DSO_TYPE_GUEST_KERNEL;
671 head = &machine->kernel_dsos;
672 break;
673 case PERF_RECORD_MISC_USER:
674 case PERF_RECORD_MISC_GUEST_USER:
675 dso_type = DSO_TYPE_USER;
676 head = &machine->user_dsos;
677 break;
678 default:
679 goto out;
680 }
681
682 dso = __dsos__findnew(head, filename);
683 if (dso != NULL) {
684 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
685
686 dso__set_build_id(dso, &bev->build_id);
687
688 if (filename[0] == '[')
689 dso->kernel = dso_type;
690
691 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
692 sbuild_id);
693 pr_debug("build id event received for %s: %s\n",
694 dso->long_name, sbuild_id);
695 }
696
697 err = 0;
698out:
699 return err;
700}
701
702static int perf_header__read_build_ids_abi_quirk(struct perf_header *header,
703 int input, u64 offset, u64 size)
704{
705 struct perf_session *session = container_of(header, struct perf_session, header);
706 struct {
707 struct perf_event_header header;
708 u8 build_id[ALIGN(BUILD_ID_SIZE, sizeof(u64))];
709 char filename[0];
710 } old_bev;
711 struct build_id_event bev;
712 char filename[PATH_MAX];
713 u64 limit = offset + size;
714
715 while (offset < limit) {
716 ssize_t len;
717
718 if (read(input, &old_bev, sizeof(old_bev)) != sizeof(old_bev))
719 return -1;
720
721 if (header->needs_swap)
722 perf_event_header__bswap(&old_bev.header);
723
724 len = old_bev.header.size - sizeof(old_bev);
725 if (read(input, filename, len) != len)
726 return -1;
727
728 bev.header = old_bev.header;
729
730 /*
731 * As the pid is the missing value, we need to fill
732 * it properly. The header.misc value give us nice hint.
733 */
734 bev.pid = HOST_KERNEL_ID;
735 if (bev.header.misc == PERF_RECORD_MISC_GUEST_USER ||
736 bev.header.misc == PERF_RECORD_MISC_GUEST_KERNEL)
737 bev.pid = DEFAULT_GUEST_KERNEL_ID;
738
739 memcpy(bev.build_id, old_bev.build_id, sizeof(bev.build_id));
740 __event_process_build_id(&bev, filename, session);
741
742 offset += bev.header.size;
743 }
744
745 return 0;
746}
747
748static int perf_header__read_build_ids(struct perf_header *header,
749 int input, u64 offset, u64 size)
750{
751 struct perf_session *session = container_of(header, struct perf_session, header);
752 struct build_id_event bev;
753 char filename[PATH_MAX];
754 u64 limit = offset + size, orig_offset = offset;
755 int err = -1;
756
757 while (offset < limit) {
758 ssize_t len;
759
760 if (read(input, &bev, sizeof(bev)) != sizeof(bev))
761 goto out;
762
763 if (header->needs_swap)
764 perf_event_header__bswap(&bev.header);
765
766 len = bev.header.size - sizeof(bev);
767 if (read(input, filename, len) != len)
768 goto out;
769 /*
770 * The a1645ce1 changeset:
771 *
772 * "perf: 'perf kvm' tool for monitoring guest performance from host"
773 *
774 * Added a field to struct build_id_event that broke the file
775 * format.
776 *
777 * Since the kernel build-id is the first entry, process the
778 * table using the old format if the well known
779 * '[kernel.kallsyms]' string for the kernel build-id has the
780 * first 4 characters chopped off (where the pid_t sits).
781 */
782 if (memcmp(filename, "nel.kallsyms]", 13) == 0) {
783 if (lseek(input, orig_offset, SEEK_SET) == (off_t)-1)
784 return -1;
785 return perf_header__read_build_ids_abi_quirk(header, input, offset, size);
786 }
787
788 __event_process_build_id(&bev, filename, session);
789
790 offset += bev.header.size;
791 }
792 err = 0;
793out:
794 return err;
795}
796
797static int perf_file_section__process(struct perf_file_section *section,
798 struct perf_header *ph,
799 int feat, int fd)
800{
801 if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
802 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
803 "%d, continuing...\n", section->offset, feat);
804 return 0;
805 }
806
807 switch (feat) {
808 case HEADER_TRACE_INFO:
809 trace_report(fd, false);
810 break;
811
812 case HEADER_BUILD_ID:
813 if (perf_header__read_build_ids(ph, fd, section->offset, section->size))
814 pr_debug("Failed to read buildids, continuing...\n");
815 break;
816 default:
817 pr_debug("unknown feature %d, continuing...\n", feat);
818 }
819
820 return 0;
821}
822
823static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
824 struct perf_header *ph, int fd,
825 bool repipe)
826{
827 if (readn(fd, header, sizeof(*header)) <= 0 ||
828 memcmp(&header->magic, __perf_magic, sizeof(header->magic)))
829 return -1;
830
831 if (repipe && do_write(STDOUT_FILENO, header, sizeof(*header)) < 0)
832 return -1;
833
834 if (header->size != sizeof(*header)) {
835 u64 size = bswap_64(header->size);
836
837 if (size != sizeof(*header))
838 return -1;
839
840 ph->needs_swap = true;
841 }
842
843 return 0;
844}
845
846static int perf_header__read_pipe(struct perf_session *session, int fd)
847{
848 struct perf_header *header = &session->header;
849 struct perf_pipe_file_header f_header;
850
851 if (perf_file_header__read_pipe(&f_header, header, fd,
852 session->repipe) < 0) {
853 pr_debug("incompatible file format\n");
854 return -EINVAL;
855 }
856
857 session->fd = fd;
858
859 return 0;
860}
861
862int perf_session__read_header(struct perf_session *session, int fd)
863{
864 struct perf_header *header = &session->header;
865 struct perf_file_header f_header;
866 struct perf_file_attr f_attr;
867 u64 f_id;
868 int nr_attrs, nr_ids, i, j;
869
870 session->evlist = perf_evlist__new(NULL, NULL);
871 if (session->evlist == NULL)
872 return -ENOMEM;
873
874 if (session->fd_pipe)
875 return perf_header__read_pipe(session, fd);
876
877 if (perf_file_header__read(&f_header, header, fd) < 0) {
878 pr_debug("incompatible file format\n");
879 return -EINVAL;
880 }
881
882 nr_attrs = f_header.attrs.size / sizeof(f_attr);
883 lseek(fd, f_header.attrs.offset, SEEK_SET);
884
885 for (i = 0; i < nr_attrs; i++) {
886 struct perf_evsel *evsel;
887 off_t tmp;
888
889 if (readn(fd, &f_attr, sizeof(f_attr)) <= 0)
890 goto out_errno;
891
892 if (header->needs_swap)
893 perf_event__attr_swap(&f_attr.attr);
894
895 tmp = lseek(fd, 0, SEEK_CUR);
896 evsel = perf_evsel__new(&f_attr.attr, i);
897
898 if (evsel == NULL)
899 goto out_delete_evlist;
900 /*
901 * Do it before so that if perf_evsel__alloc_id fails, this
902 * entry gets purged too at perf_evlist__delete().
903 */
904 perf_evlist__add(session->evlist, evsel);
905
906 nr_ids = f_attr.ids.size / sizeof(u64);
907 /*
908 * We don't have the cpu and thread maps on the header, so
909 * for allocating the perf_sample_id table we fake 1 cpu and
910 * hattr->ids threads.
911 */
912 if (perf_evsel__alloc_id(evsel, 1, nr_ids))
913 goto out_delete_evlist;
914
915 lseek(fd, f_attr.ids.offset, SEEK_SET);
916
917 for (j = 0; j < nr_ids; j++) {
918 if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))
919 goto out_errno;
920
921 perf_evlist__id_add(session->evlist, evsel, 0, j, f_id);
922 }
923
924 lseek(fd, tmp, SEEK_SET);
925 }
926
927 if (f_header.event_types.size) {
928 lseek(fd, f_header.event_types.offset, SEEK_SET);
929 events = malloc(f_header.event_types.size);
930 if (events == NULL)
931 return -ENOMEM;
932 if (perf_header__getbuffer64(header, fd, events,
933 f_header.event_types.size))
934 goto out_errno;
935 event_count = f_header.event_types.size / sizeof(struct perf_trace_event_type);
936 }
937
938 perf_header__process_sections(header, fd, perf_file_section__process);
939
940 lseek(fd, header->data_offset, SEEK_SET);
941
942 header->frozen = 1;
943 return 0;
944out_errno:
945 return -errno;
946
947out_delete_evlist:
948 perf_evlist__delete(session->evlist);
949 session->evlist = NULL;
950 return -ENOMEM;
951}
952
953int perf_event__synthesize_attr(struct perf_event_attr *attr, u16 ids, u64 *id,
954 perf_event__handler_t process,
955 struct perf_session *session)
956{
957 union perf_event *ev;
958 size_t size;
959 int err;
960
961 size = sizeof(struct perf_event_attr);
962 size = ALIGN(size, sizeof(u64));
963 size += sizeof(struct perf_event_header);
964 size += ids * sizeof(u64);
965
966 ev = malloc(size);
967
968 if (ev == NULL)
969 return -ENOMEM;
970
971 ev->attr.attr = *attr;
972 memcpy(ev->attr.id, id, ids * sizeof(u64));
973
974 ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
975 ev->attr.header.size = size;
976
977 err = process(ev, NULL, session);
978
979 free(ev);
980
981 return err;
982}
983
984int perf_session__synthesize_attrs(struct perf_session *session,
985 perf_event__handler_t process)
986{
987 struct perf_evsel *attr;
988 int err = 0;
989
990 list_for_each_entry(attr, &session->evlist->entries, node) {
991 err = perf_event__synthesize_attr(&attr->attr, attr->ids,
992 attr->id, process, session);
993 if (err) {
994 pr_debug("failed to create perf header attribute\n");
995 return err;
996 }
997 }
998
999 return err;
1000}
1001
1002int perf_event__process_attr(union perf_event *event,
1003 struct perf_session *session)
1004{
1005 unsigned int i, ids, n_ids;
1006 struct perf_evsel *evsel;
1007
1008 if (session->evlist == NULL) {
1009 session->evlist = perf_evlist__new(NULL, NULL);
1010 if (session->evlist == NULL)
1011 return -ENOMEM;
1012 }
1013
1014 evsel = perf_evsel__new(&event->attr.attr,
1015 session->evlist->nr_entries);
1016 if (evsel == NULL)
1017 return -ENOMEM;
1018
1019 perf_evlist__add(session->evlist, evsel);
1020
1021 ids = event->header.size;
1022 ids -= (void *)&event->attr.id - (void *)event;
1023 n_ids = ids / sizeof(u64);
1024 /*
1025 * We don't have the cpu and thread maps on the header, so
1026 * for allocating the perf_sample_id table we fake 1 cpu and
1027 * hattr->ids threads.
1028 */
1029 if (perf_evsel__alloc_id(evsel, 1, n_ids))
1030 return -ENOMEM;
1031
1032 for (i = 0; i < n_ids; i++) {
1033 perf_evlist__id_add(session->evlist, evsel, 0, i,
1034 event->attr.id[i]);
1035 }
1036
1037 perf_session__update_sample_type(session);
1038
1039 return 0;
1040}
1041
1042int perf_event__synthesize_event_type(u64 event_id, char *name,
1043 perf_event__handler_t process,
1044 struct perf_session *session)
1045{
1046 union perf_event ev;
1047 size_t size = 0;
1048 int err = 0;
1049
1050 memset(&ev, 0, sizeof(ev));
1051
1052 ev.event_type.event_type.event_id = event_id;
1053 memset(ev.event_type.event_type.name, 0, MAX_EVENT_NAME);
1054 strncpy(ev.event_type.event_type.name, name, MAX_EVENT_NAME - 1);
1055
1056 ev.event_type.header.type = PERF_RECORD_HEADER_EVENT_TYPE;
1057 size = strlen(name);
1058 size = ALIGN(size, sizeof(u64));
1059 ev.event_type.header.size = sizeof(ev.event_type) -
1060 (sizeof(ev.event_type.event_type.name) - size);
1061
1062 err = process(&ev, NULL, session);
1063
1064 return err;
1065}
1066
1067int perf_event__synthesize_event_types(perf_event__handler_t process,
1068 struct perf_session *session)
1069{
1070 struct perf_trace_event_type *type;
1071 int i, err = 0;
1072
1073 for (i = 0; i < event_count; i++) {
1074 type = &events[i];
1075
1076 err = perf_event__synthesize_event_type(type->event_id,
1077 type->name, process,
1078 session);
1079 if (err) {
1080 pr_debug("failed to create perf header event type\n");
1081 return err;
1082 }
1083 }
1084
1085 return err;
1086}
1087
1088int perf_event__process_event_type(union perf_event *event,
1089 struct perf_session *session __unused)
1090{
1091 if (perf_header__push_event(event->event_type.event_type.event_id,
1092 event->event_type.event_type.name) < 0)
1093 return -ENOMEM;
1094
1095 return 0;
1096}
1097
1098int perf_event__synthesize_tracing_data(int fd, struct perf_evlist *evlist,
1099 perf_event__handler_t process,
1100 struct perf_session *session __unused)
1101{
1102 union perf_event ev;
1103 ssize_t size = 0, aligned_size = 0, padding;
1104 int err __used = 0;
1105
1106 memset(&ev, 0, sizeof(ev));
1107
1108 ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
1109 size = read_tracing_data_size(fd, &evlist->entries);
1110 if (size <= 0)
1111 return size;
1112 aligned_size = ALIGN(size, sizeof(u64));
1113 padding = aligned_size - size;
1114 ev.tracing_data.header.size = sizeof(ev.tracing_data);
1115 ev.tracing_data.size = aligned_size;
1116
1117 process(&ev, NULL, session);
1118
1119 err = read_tracing_data(fd, &evlist->entries);
1120 write_padded(fd, NULL, 0, padding);
1121
1122 return aligned_size;
1123}
1124
1125int perf_event__process_tracing_data(union perf_event *event,
1126 struct perf_session *session)
1127{
1128 ssize_t size_read, padding, size = event->tracing_data.size;
1129 off_t offset = lseek(session->fd, 0, SEEK_CUR);
1130 char buf[BUFSIZ];
1131
1132 /* setup for reading amidst mmap */
1133 lseek(session->fd, offset + sizeof(struct tracing_data_event),
1134 SEEK_SET);
1135
1136 size_read = trace_report(session->fd, session->repipe);
1137
1138 padding = ALIGN(size_read, sizeof(u64)) - size_read;
1139
1140 if (read(session->fd, buf, padding) < 0)
1141 die("reading input file");
1142 if (session->repipe) {
1143 int retw = write(STDOUT_FILENO, buf, padding);
1144 if (retw <= 0 || retw != padding)
1145 die("repiping tracing data padding");
1146 }
1147
1148 if (size_read + padding != size)
1149 die("tracing data size mismatch");
1150
1151 return size_read + padding;
1152}
1153
1154int perf_event__synthesize_build_id(struct dso *pos, u16 misc,
1155 perf_event__handler_t process,
1156 struct machine *machine,
1157 struct perf_session *session)
1158{
1159 union perf_event ev;
1160 size_t len;
1161 int err = 0;
1162
1163 if (!pos->hit)
1164 return err;
1165
1166 memset(&ev, 0, sizeof(ev));
1167
1168 len = pos->long_name_len + 1;
1169 len = ALIGN(len, NAME_ALIGN);
1170 memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
1171 ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
1172 ev.build_id.header.misc = misc;
1173 ev.build_id.pid = machine->pid;
1174 ev.build_id.header.size = sizeof(ev.build_id) + len;
1175 memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
1176
1177 err = process(&ev, NULL, session);
1178
1179 return err;
1180}
1181
1182int perf_event__process_build_id(union perf_event *event,
1183 struct perf_session *session)
1184{
1185 __event_process_build_id(&event->build_id,
1186 event->build_id.filename,
1187 session);
1188 return 0;
1189}
1190
1191void disable_buildid_cache(void)
1192{
1193 no_buildid_cache = true;
1194}