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perf record: Provide default branch stack sampling mode option
[deliverable/linux.git] / tools / perf / util / header.c
CommitLineData
b8f46c5a
XG		 1#define _FILE_OFFSET_BITS 64
2
a9072bc0 3#include "util.h"
7c6a1c65 4#include <sys/types.h>
ba21594c 5#include <byteswap.h>
7c6a1c65
PZ		 6#include <unistd.h>
7#include <stdio.h>
8#include <stdlib.h>
8671dab9 9#include <linux/list.h>
ba21594c 10#include <linux/kernel.h>
b1e5a9be 11#include <linux/bitops.h>
fbe96f29 12#include <sys/utsname.h>
7c6a1c65 13
361c99a6 14#include "evlist.h"
a91e5431 15#include "evsel.h"
7c6a1c65 16#include "header.h"
03456a15
FW		 17#include "../perf.h"
18#include "trace-event.h"
301a0b02 19#include "session.h"
8671dab9 20#include "symbol.h"
4778d2e4 21#include "debug.h"
fbe96f29 22#include "cpumap.h"
7c6a1c65 23
a1ac1d3c
SE		 24static bool no_buildid_cache = false;
25
8755a8f2
AV		 26static int event_count;
27static struct perf_trace_event_type *events;
28
fbe96f29
SE		 29static u32 header_argc;
30static const char **header_argv;
31
ae99fb2c 32int perf_header__push_event(u64 id, const char *name)
8755a8f2 33{
ec60a3fe 34 if (strlen(name) > MAX_EVENT_NAME)
6beba7ad 35 pr_warning("Event %s will be truncated\n", name);
8755a8f2
AV		 36
37 if (!events) {
38 events = malloc(sizeof(struct perf_trace_event_type));
ae99fb2c
ACM		 39 if (events == NULL)
40 return -ENOMEM;
8755a8f2 41 } else {
ae99fb2c
ACM		 42 struct perf_trace_event_type *nevents;
43
44 nevents = realloc(events, (event_count + 1) * sizeof(*events));
45 if (nevents == NULL)
46 return -ENOMEM;
47 events = nevents;
8755a8f2
AV		 48 }
49 memset(&events[event_count], 0, sizeof(struct perf_trace_event_type));
50 events[event_count].event_id = id;
ec60a3fe 51 strncpy(events[event_count].name, name, MAX_EVENT_NAME - 1);
8755a8f2 52 event_count++;
ae99fb2c 53 return 0;
8755a8f2
AV		 54}
55
56char *perf_header__find_event(u64 id)
57{
58 int i;
59 for (i = 0 ; i < event_count; i++) {
60 if (events[i].event_id == id)
61 return events[i].name;
62 }
63 return NULL;
64}
65
73323f54
SE		 66/*
67 * magic2 = "PERFILE2"
68 * must be a numerical value to let the endianness
69 * determine the memory layout. That way we are able
70 * to detect endianness when reading the perf.data file
71 * back.
72 *
73 * we check for legacy (PERFFILE) format.
74 */
75static const char *__perf_magic1 = "PERFFILE";
76static const u64 __perf_magic2 = 0x32454c4946524550ULL;
77static const u64 __perf_magic2_sw = 0x50455246494c4532ULL;
7c6a1c65 78
73323f54 79#define PERF_MAGIC __perf_magic2
7c6a1c65 80
7c6a1c65 81struct perf_file_attr {
cdd6c482 82 struct perf_event_attr attr;
7c6a1c65
PZ		 83 struct perf_file_section ids;
84};
85
1c0b04d1 86void perf_header__set_feat(struct perf_header *header, int feat)
8d06367f 87{
1c0b04d1 88 set_bit(feat, header->adds_features);
8d06367f
ACM		 89}
90
1c0b04d1 91void perf_header__clear_feat(struct perf_header *header, int feat)
baa2f6ce 92{
1c0b04d1 93 clear_bit(feat, header->adds_features);
baa2f6ce
ACM		 94}
95
1c0b04d1 96bool perf_header__has_feat(const struct perf_header *header, int feat)
8d06367f 97{
1c0b04d1 98 return test_bit(feat, header->adds_features);
8d06367f
ACM		 99}
100
3726cc75 101static int do_write(int fd, const void *buf, size_t size)
7c6a1c65
PZ		 102{
103 while (size) {
104 int ret = write(fd, buf, size);
105
106 if (ret < 0)
d5eed904 107 return -errno;
7c6a1c65
PZ		 108
109 size -= ret;
110 buf += ret;
111 }
3726cc75
ACM		 112
113 return 0;
7c6a1c65
PZ		 114}
115
f92cb24c
ACM		 116#define NAME_ALIGN 64
117
118static int write_padded(int fd, const void *bf, size_t count,
119 size_t count_aligned)
120{
121 static const char zero_buf[NAME_ALIGN];
122 int err = do_write(fd, bf, count);
123
124 if (!err)
125 err = do_write(fd, zero_buf, count_aligned - count);
126
127 return err;
128}
129
fbe96f29
SE		 130static int do_write_string(int fd, const char *str)
131{
132 u32 len, olen;
133 int ret;
134
135 olen = strlen(str) + 1;
136 len = ALIGN(olen, NAME_ALIGN);
137
138 /* write len, incl. \0 */
139 ret = do_write(fd, &len, sizeof(len));
140 if (ret < 0)
141 return ret;
142
143 return write_padded(fd, str, olen, len);
144}
145
146static char *do_read_string(int fd, struct perf_header *ph)
147{
148 ssize_t sz, ret;
149 u32 len;
150 char *buf;
151
152 sz = read(fd, &len, sizeof(len));
153 if (sz < (ssize_t)sizeof(len))
154 return NULL;
155
156 if (ph->needs_swap)
157 len = bswap_32(len);
158
159 buf = malloc(len);
160 if (!buf)
161 return NULL;
162
163 ret = read(fd, buf, len);
164 if (ret == (ssize_t)len) {
165 /*
166 * strings are padded by zeroes
167 * thus the actual strlen of buf
168 * may be less than len
169 */
170 return buf;
171 }
172
173 free(buf);
174 return NULL;
175}
176
177int
178perf_header__set_cmdline(int argc, const char **argv)
179{
180 int i;
181
182 header_argc = (u32)argc;
183
184 /* do not include NULL termination */
185 header_argv = calloc(argc, sizeof(char *));
186 if (!header_argv)
187 return -ENOMEM;
188
189 /*
190 * must copy argv contents because it gets moved
191 * around during option parsing
192 */
193 for (i = 0; i < argc ; i++)
194 header_argv[i] = argv[i];
195
196 return 0;
197}
198
1b549504
RR		 199#define dsos__for_each_with_build_id(pos, head) \
200 list_for_each_entry(pos, head, node) \
201 if (!pos->has_build_id) \
202 continue; \
203 else
204
205static int __dsos__write_buildid_table(struct list_head *head, pid_t pid,
206 u16 misc, int fd)
207{
208 struct dso *pos;
209
210 dsos__for_each_with_build_id(pos, head) {
211 int err;
212 struct build_id_event b;
213 size_t len;
214
215 if (!pos->hit)
216 continue;
217 len = pos->long_name_len + 1;
218 len = ALIGN(len, NAME_ALIGN);
219 memset(&b, 0, sizeof(b));
220 memcpy(&b.build_id, pos->build_id, sizeof(pos->build_id));
221 b.pid = pid;
222 b.header.misc = misc;
223 b.header.size = sizeof(b) + len;
224 err = do_write(fd, &b, sizeof(b));
225 if (err < 0)
226 return err;
227 err = write_padded(fd, pos->long_name,
228 pos->long_name_len + 1, len);
229 if (err < 0)
230 return err;
231 }
232
233 return 0;
234}
235
236static int machine__write_buildid_table(struct machine *machine, int fd)
237{
238 int err;
239 u16 kmisc = PERF_RECORD_MISC_KERNEL,
240 umisc = PERF_RECORD_MISC_USER;
241
242 if (!machine__is_host(machine)) {
243 kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
244 umisc = PERF_RECORD_MISC_GUEST_USER;
245 }
246
247 err = __dsos__write_buildid_table(&machine->kernel_dsos, machine->pid,
248 kmisc, fd);
249 if (err == 0)
250 err = __dsos__write_buildid_table(&machine->user_dsos,
251 machine->pid, umisc, fd);
252 return err;
253}
254
255static int dsos__write_buildid_table(struct perf_header *header, int fd)
256{
257 struct perf_session *session = container_of(header,
258 struct perf_session, header);
259 struct rb_node *nd;
260 int err = machine__write_buildid_table(&session->host_machine, fd);
261
262 if (err)
263 return err;
264
265 for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
266 struct machine *pos = rb_entry(nd, struct machine, rb_node);
267 err = machine__write_buildid_table(pos, fd);
268 if (err)
269 break;
270 }
271 return err;
272}
273
274int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
275 const char *name, bool is_kallsyms)
276{
277 const size_t size = PATH_MAX;
278 char *realname, *filename = zalloc(size),
279 *linkname = zalloc(size), *targetname;
280 int len, err = -1;
281
282 if (is_kallsyms) {
283 if (symbol_conf.kptr_restrict) {
284 pr_debug("Not caching a kptr_restrict'ed /proc/kallsyms\n");
285 return 0;
286 }
287 realname = (char *)name;
288 } else
289 realname = realpath(name, NULL);
290
291 if (realname == NULL || filename == NULL || linkname == NULL)
292 goto out_free;
293
294 len = snprintf(filename, size, "%s%s%s",
295 debugdir, is_kallsyms ? "/" : "", realname);
296 if (mkdir_p(filename, 0755))
297 goto out_free;
298
299 snprintf(filename + len, sizeof(filename) - len, "/%s", sbuild_id);
300
301 if (access(filename, F_OK)) {
302 if (is_kallsyms) {
303 if (copyfile("/proc/kallsyms", filename))
304 goto out_free;
305 } else if (link(realname, filename) && copyfile(name, filename))
306 goto out_free;
307 }
308
309 len = snprintf(linkname, size, "%s/.build-id/%.2s",
310 debugdir, sbuild_id);
311
312 if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
313 goto out_free;
314
315 snprintf(linkname + len, size - len, "/%s", sbuild_id + 2);
316 targetname = filename + strlen(debugdir) - 5;
317 memcpy(targetname, "../..", 5);
318
319 if (symlink(targetname, linkname) == 0)
320 err = 0;
321out_free:
322 if (!is_kallsyms)
323 free(realname);
324 free(filename);
325 free(linkname);
326 return err;
327}
328
329static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
330 const char *name, const char *debugdir,
331 bool is_kallsyms)
332{
333 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
334
335 build_id__sprintf(build_id, build_id_size, sbuild_id);
336
337 return build_id_cache__add_s(sbuild_id, debugdir, name, is_kallsyms);
338}
339
340int build_id_cache__remove_s(const char *sbuild_id, const char *debugdir)
341{
342 const size_t size = PATH_MAX;
343 char *filename = zalloc(size),
344 *linkname = zalloc(size);
345 int err = -1;
346
347 if (filename == NULL || linkname == NULL)
348 goto out_free;
349
350 snprintf(linkname, size, "%s/.build-id/%.2s/%s",
351 debugdir, sbuild_id, sbuild_id + 2);
352
353 if (access(linkname, F_OK))
354 goto out_free;
355
356 if (readlink(linkname, filename, size - 1) < 0)
357 goto out_free;
358
359 if (unlink(linkname))
360 goto out_free;
361
362 /*
363 * Since the link is relative, we must make it absolute:
364 */
365 snprintf(linkname, size, "%s/.build-id/%.2s/%s",
366 debugdir, sbuild_id, filename);
367
368 if (unlink(linkname))
369 goto out_free;
370
371 err = 0;
372out_free:
373 free(filename);
374 free(linkname);
375 return err;
376}
377
378static int dso__cache_build_id(struct dso *dso, const char *debugdir)
379{
380 bool is_kallsyms = dso->kernel && dso->long_name[0] != '/';
381
382 return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id),
383 dso->long_name, debugdir, is_kallsyms);
384}
385
386static int __dsos__cache_build_ids(struct list_head *head, const char *debugdir)
387{
388 struct dso *pos;
389 int err = 0;
390
391 dsos__for_each_with_build_id(pos, head)
392 if (dso__cache_build_id(pos, debugdir))
393 err = -1;
394
395 return err;
396}
397
398static int machine__cache_build_ids(struct machine *machine, const char *debugdir)
399{
400 int ret = __dsos__cache_build_ids(&machine->kernel_dsos, debugdir);
401 ret |= __dsos__cache_build_ids(&machine->user_dsos, debugdir);
402 return ret;
403}
404
405static int perf_session__cache_build_ids(struct perf_session *session)
406{
407 struct rb_node *nd;
408 int ret;
409 char debugdir[PATH_MAX];
410
411 snprintf(debugdir, sizeof(debugdir), "%s", buildid_dir);
412
413 if (mkdir(debugdir, 0755) != 0 && errno != EEXIST)
414 return -1;
415
416 ret = machine__cache_build_ids(&session->host_machine, debugdir);
417
418 for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
419 struct machine *pos = rb_entry(nd, struct machine, rb_node);
420 ret |= machine__cache_build_ids(pos, debugdir);
421 }
422 return ret ? -1 : 0;
423}
424
425static bool machine__read_build_ids(struct machine *machine, bool with_hits)
426{
427 bool ret = __dsos__read_build_ids(&machine->kernel_dsos, with_hits);
428 ret |= __dsos__read_build_ids(&machine->user_dsos, with_hits);
429 return ret;
430}
431
432static bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
433{
434 struct rb_node *nd;
435 bool ret = machine__read_build_ids(&session->host_machine, with_hits);
436
437 for (nd = rb_first(&session->machines); nd; nd = rb_next(nd)) {
438 struct machine *pos = rb_entry(nd, struct machine, rb_node);
439 ret |= machine__read_build_ids(pos, with_hits);
440 }
441
442 return ret;
443}
444
fbe96f29
SE		 445static int write_trace_info(int fd, struct perf_header *h __used,
446 struct perf_evlist *evlist)
447{
448 return read_tracing_data(fd, &evlist->entries);
449}
450
451
452static int write_build_id(int fd, struct perf_header *h,
453 struct perf_evlist *evlist __used)
454{
455 struct perf_session *session;
456 int err;
457
458 session = container_of(h, struct perf_session, header);
459
e20960c0
RR		 460 if (!perf_session__read_build_ids(session, true))
461 return -1;
462
fbe96f29
SE		 463 err = dsos__write_buildid_table(h, fd);
464 if (err < 0) {
465 pr_debug("failed to write buildid table\n");
466 return err;
467 }
468 if (!no_buildid_cache)
469 perf_session__cache_build_ids(session);
470
471 return 0;
472}
473
474static int write_hostname(int fd, struct perf_header *h __used,
475 struct perf_evlist *evlist __used)
476{
477 struct utsname uts;
478 int ret;
479
480 ret = uname(&uts);
481 if (ret < 0)
482 return -1;
483
484 return do_write_string(fd, uts.nodename);
485}
486
487static int write_osrelease(int fd, struct perf_header *h __used,
488 struct perf_evlist *evlist __used)
489{
490 struct utsname uts;
491 int ret;
492
493 ret = uname(&uts);
494 if (ret < 0)
495 return -1;
496
497 return do_write_string(fd, uts.release);
498}
499
500static int write_arch(int fd, struct perf_header *h __used,
501 struct perf_evlist *evlist __used)
502{
503 struct utsname uts;
504 int ret;
505
506 ret = uname(&uts);
507 if (ret < 0)
508 return -1;
509
510 return do_write_string(fd, uts.machine);
511}
512
513static int write_version(int fd, struct perf_header *h __used,
514 struct perf_evlist *evlist __used)
515{
516 return do_write_string(fd, perf_version_string);
517}
518
519static int write_cpudesc(int fd, struct perf_header *h __used,
520 struct perf_evlist *evlist __used)
521{
522#ifndef CPUINFO_PROC
523#define CPUINFO_PROC NULL
524#endif
525 FILE *file;
526 char *buf = NULL;
527 char *s, *p;
528 const char *search = CPUINFO_PROC;
529 size_t len = 0;
530 int ret = -1;
531
532 if (!search)
533 return -1;
534
535 file = fopen("/proc/cpuinfo", "r");
536 if (!file)
537 return -1;
538
539 while (getline(&buf, &len, file) > 0) {
540 ret = strncmp(buf, search, strlen(search));
541 if (!ret)
542 break;
543 }
544
545 if (ret)
546 goto done;
547
548 s = buf;
549
550 p = strchr(buf, ':');
551 if (p && *(p+1) == ' ' && *(p+2))
552 s = p + 2;
553 p = strchr(s, '\n');
554 if (p)
555 *p = '\0';
556
557 /* squash extra space characters (branding string) */
558 p = s;
559 while (*p) {
560 if (isspace(*p)) {
561 char *r = p + 1;
562 char *q = r;
563 *p = ' ';
564 while (*q && isspace(*q))
565 q++;
566 if (q != (p+1))
567 while ((*r++ = *q++));
568 }
569 p++;
570 }
571 ret = do_write_string(fd, s);
572done:
573 free(buf);
574 fclose(file);
575 return ret;
576}
577
578static int write_nrcpus(int fd, struct perf_header *h __used,
579 struct perf_evlist *evlist __used)
580{
581 long nr;
582 u32 nrc, nra;
583 int ret;
584
585 nr = sysconf(_SC_NPROCESSORS_CONF);
586 if (nr < 0)
587 return -1;
588
589 nrc = (u32)(nr & UINT_MAX);
590
591 nr = sysconf(_SC_NPROCESSORS_ONLN);
592 if (nr < 0)
593 return -1;
594
595 nra = (u32)(nr & UINT_MAX);
596
597 ret = do_write(fd, &nrc, sizeof(nrc));
598 if (ret < 0)
599 return ret;
600
601 return do_write(fd, &nra, sizeof(nra));
602}
603
604static int write_event_desc(int fd, struct perf_header *h __used,
605 struct perf_evlist *evlist)
606{
607 struct perf_evsel *attr;
608 u32 nre = 0, nri, sz;
609 int ret;
610
611 list_for_each_entry(attr, &evlist->entries, node)
612 nre++;
613
614 /*
615 * write number of events
616 */
617 ret = do_write(fd, &nre, sizeof(nre));
618 if (ret < 0)
619 return ret;
620
621 /*
622 * size of perf_event_attr struct
623 */
624 sz = (u32)sizeof(attr->attr);
625 ret = do_write(fd, &sz, sizeof(sz));
626 if (ret < 0)
627 return ret;
628
629 list_for_each_entry(attr, &evlist->entries, node) {
630
631 ret = do_write(fd, &attr->attr, sz);
632 if (ret < 0)
633 return ret;
634 /*
635 * write number of unique id per event
636 * there is one id per instance of an event
637 *
638 * copy into an nri to be independent of the
639 * type of ids,
640 */
641 nri = attr->ids;
642 ret = do_write(fd, &nri, sizeof(nri));
643 if (ret < 0)
644 return ret;
645
646 /*
647 * write event string as passed on cmdline
648 */
6340cfed 649 ret = do_write_string(fd, event_name(attr));
fbe96f29
SE		 650 if (ret < 0)
651 return ret;
652 /*
653 * write unique ids for this event
654 */
655 ret = do_write(fd, attr->id, attr->ids * sizeof(u64));
656 if (ret < 0)
657 return ret;
658 }
659 return 0;
660}
661
662static int write_cmdline(int fd, struct perf_header *h __used,
663 struct perf_evlist *evlist __used)
664{
665 char buf[MAXPATHLEN];
666 char proc[32];
667 u32 i, n;
668 int ret;
669
670 /*
671 * actual atual path to perf binary
672 */
673 sprintf(proc, "/proc/%d/exe", getpid());
674 ret = readlink(proc, buf, sizeof(buf));
675 if (ret <= 0)
676 return -1;
677
678 /* readlink() does not add null termination */
679 buf[ret] = '\0';
680
681 /* account for binary path */
682 n = header_argc + 1;
683
684 ret = do_write(fd, &n, sizeof(n));
685 if (ret < 0)
686 return ret;
687
688 ret = do_write_string(fd, buf);
689 if (ret < 0)
690 return ret;
691
692 for (i = 0 ; i < header_argc; i++) {
693 ret = do_write_string(fd, header_argv[i]);
694 if (ret < 0)
695 return ret;
696 }
697 return 0;
698}
699
700#define CORE_SIB_FMT \
701 "/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
702#define THRD_SIB_FMT \
703 "/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
704
705struct cpu_topo {
706 u32 core_sib;
707 u32 thread_sib;
708 char **core_siblings;
709 char **thread_siblings;
710};
711
712static int build_cpu_topo(struct cpu_topo *tp, int cpu)
713{
714 FILE *fp;
715 char filename[MAXPATHLEN];
716 char *buf = NULL, *p;
717 size_t len = 0;
718 u32 i = 0;
719 int ret = -1;
720
721 sprintf(filename, CORE_SIB_FMT, cpu);
722 fp = fopen(filename, "r");
723 if (!fp)
724 return -1;
725
726 if (getline(&buf, &len, fp) <= 0)
727 goto done;
728
729 fclose(fp);
730
731 p = strchr(buf, '\n');
732 if (p)
733 *p = '\0';
734
735 for (i = 0; i < tp->core_sib; i++) {
736 if (!strcmp(buf, tp->core_siblings[i]))
737 break;
738 }
739 if (i == tp->core_sib) {
740 tp->core_siblings[i] = buf;
741 tp->core_sib++;
742 buf = NULL;
743 len = 0;
744 }
745
746 sprintf(filename, THRD_SIB_FMT, cpu);
747 fp = fopen(filename, "r");
748 if (!fp)
749 goto done;
750
751 if (getline(&buf, &len, fp) <= 0)
752 goto done;
753
754 p = strchr(buf, '\n');
755 if (p)
756 *p = '\0';
757
758 for (i = 0; i < tp->thread_sib; i++) {
759 if (!strcmp(buf, tp->thread_siblings[i]))
760 break;
761 }
762 if (i == tp->thread_sib) {
763 tp->thread_siblings[i] = buf;
764 tp->thread_sib++;
765 buf = NULL;
766 }
767 ret = 0;
768done:
769 if(fp)
770 fclose(fp);
771 free(buf);
772 return ret;
773}
774
775static void free_cpu_topo(struct cpu_topo *tp)
776{
777 u32 i;
778
779 if (!tp)
780 return;
781
782 for (i = 0 ; i < tp->core_sib; i++)
783 free(tp->core_siblings[i]);
784
785 for (i = 0 ; i < tp->thread_sib; i++)
786 free(tp->thread_siblings[i]);
787
788 free(tp);
789}
790
791static struct cpu_topo *build_cpu_topology(void)
792{
793 struct cpu_topo *tp;
794 void *addr;
795 u32 nr, i;
796 size_t sz;
797 long ncpus;
798 int ret = -1;
799
800 ncpus = sysconf(_SC_NPROCESSORS_CONF);
801 if (ncpus < 0)
802 return NULL;
803
804 nr = (u32)(ncpus & UINT_MAX);
805
806 sz = nr * sizeof(char *);
807
808 addr = calloc(1, sizeof(*tp) + 2 * sz);
809 if (!addr)
810 return NULL;
811
812 tp = addr;
813
814 addr += sizeof(*tp);
815 tp->core_siblings = addr;
816 addr += sz;
817 tp->thread_siblings = addr;
818
819 for (i = 0; i < nr; i++) {
820 ret = build_cpu_topo(tp, i);
821 if (ret < 0)
822 break;
823 }
824 if (ret) {
825 free_cpu_topo(tp);
826 tp = NULL;
827 }
828 return tp;
829}
830
831static int write_cpu_topology(int fd, struct perf_header *h __used,
832 struct perf_evlist *evlist __used)
833{
834 struct cpu_topo *tp;
835 u32 i;
836 int ret;
837
838 tp = build_cpu_topology();
839 if (!tp)
840 return -1;
841
842 ret = do_write(fd, &tp->core_sib, sizeof(tp->core_sib));
843 if (ret < 0)
844 goto done;
845
846 for (i = 0; i < tp->core_sib; i++) {
847 ret = do_write_string(fd, tp->core_siblings[i]);
848 if (ret < 0)
849 goto done;
850 }
851 ret = do_write(fd, &tp->thread_sib, sizeof(tp->thread_sib));
852 if (ret < 0)
853 goto done;
854
855 for (i = 0; i < tp->thread_sib; i++) {
856 ret = do_write_string(fd, tp->thread_siblings[i]);
857 if (ret < 0)
858 break;
859 }
860done:
861 free_cpu_topo(tp);
862 return ret;
863}
864
865
866
867static int write_total_mem(int fd, struct perf_header *h __used,
868 struct perf_evlist *evlist __used)
869{
870 char *buf = NULL;
871 FILE *fp;
872 size_t len = 0;
873 int ret = -1, n;
874 uint64_t mem;
875
876 fp = fopen("/proc/meminfo", "r");
877 if (!fp)
878 return -1;
879
880 while (getline(&buf, &len, fp) > 0) {
881 ret = strncmp(buf, "MemTotal:", 9);
882 if (!ret)
883 break;
884 }
885 if (!ret) {
886 n = sscanf(buf, "%*s %"PRIu64, &mem);
887 if (n == 1)
888 ret = do_write(fd, &mem, sizeof(mem));
889 }
890 free(buf);
891 fclose(fp);
892 return ret;
893}
894
895static int write_topo_node(int fd, int node)
896{
897 char str[MAXPATHLEN];
898 char field[32];
899 char *buf = NULL, *p;
900 size_t len = 0;
901 FILE *fp;
902 u64 mem_total, mem_free, mem;
903 int ret = -1;
904
905 sprintf(str, "/sys/devices/system/node/node%d/meminfo", node);
906 fp = fopen(str, "r");
907 if (!fp)
908 return -1;
909
910 while (getline(&buf, &len, fp) > 0) {
911 /* skip over invalid lines */
912 if (!strchr(buf, ':'))
913 continue;
914 if (sscanf(buf, "%*s %*d %s %"PRIu64, field, &mem) != 2)
915 goto done;
916 if (!strcmp(field, "MemTotal:"))
917 mem_total = mem;
918 if (!strcmp(field, "MemFree:"))
919 mem_free = mem;
920 }
921
922 fclose(fp);
923
924 ret = do_write(fd, &mem_total, sizeof(u64));
925 if (ret)
926 goto done;
927
928 ret = do_write(fd, &mem_free, sizeof(u64));
929 if (ret)
930 goto done;
931
932 ret = -1;
933 sprintf(str, "/sys/devices/system/node/node%d/cpulist", node);
934
935 fp = fopen(str, "r");
936 if (!fp)
937 goto done;
938
939 if (getline(&buf, &len, fp) <= 0)
940 goto done;
941
942 p = strchr(buf, '\n');
943 if (p)
944 *p = '\0';
945
946 ret = do_write_string(fd, buf);
947done:
948 free(buf);
949 fclose(fp);
950 return ret;
951}
952
953static int write_numa_topology(int fd, struct perf_header *h __used,
954 struct perf_evlist *evlist __used)
955{
956 char *buf = NULL;
957 size_t len = 0;
958 FILE *fp;
959 struct cpu_map *node_map = NULL;
960 char *c;
961 u32 nr, i, j;
962 int ret = -1;
963
964 fp = fopen("/sys/devices/system/node/online", "r");
965 if (!fp)
966 return -1;
967
968 if (getline(&buf, &len, fp) <= 0)
969 goto done;
970
971 c = strchr(buf, '\n');
972 if (c)
973 *c = '\0';
974
975 node_map = cpu_map__new(buf);
976 if (!node_map)
977 goto done;
978
979 nr = (u32)node_map->nr;
980
981 ret = do_write(fd, &nr, sizeof(nr));
982 if (ret < 0)
983 goto done;
984
985 for (i = 0; i < nr; i++) {
986 j = (u32)node_map->map[i];
987 ret = do_write(fd, &j, sizeof(j));
988 if (ret < 0)
989 break;
990
991 ret = write_topo_node(fd, i);
992 if (ret < 0)
993 break;
994 }
995done:
996 free(buf);
997 fclose(fp);
998 free(node_map);
999 return ret;
1000}
1001
1002/*
1003 * default get_cpuid(): nothing gets recorded
1004 * actual implementation must be in arch/$(ARCH)/util/header.c
1005 */
1006int __attribute__((weak)) get_cpuid(char *buffer __used, size_t sz __used)
1007{
1008 return -1;
1009}
1010
1011static int write_cpuid(int fd, struct perf_header *h __used,
1012 struct perf_evlist *evlist __used)
1013{
1014 char buffer[64];
1015 int ret;
1016
1017 ret = get_cpuid(buffer, sizeof(buffer));
1018 if (!ret)
1019 goto write_it;
1020
1021 return -1;
1022write_it:
1023 return do_write_string(fd, buffer);
1024}
1025
1026static void print_hostname(struct perf_header *ph, int fd, FILE *fp)
1027{
1028 char *str = do_read_string(fd, ph);
1029 fprintf(fp, "# hostname : %s\n", str);
1030 free(str);
1031}
1032
1033static void print_osrelease(struct perf_header *ph, int fd, FILE *fp)
1034{
1035 char *str = do_read_string(fd, ph);
1036 fprintf(fp, "# os release : %s\n", str);
1037 free(str);
1038}
1039
1040static void print_arch(struct perf_header *ph, int fd, FILE *fp)
1041{
1042 char *str = do_read_string(fd, ph);
1043 fprintf(fp, "# arch : %s\n", str);
1044 free(str);
1045}
1046
1047static void print_cpudesc(struct perf_header *ph, int fd, FILE *fp)
1048{
1049 char *str = do_read_string(fd, ph);
1050 fprintf(fp, "# cpudesc : %s\n", str);
1051 free(str);
1052}
1053
1054static void print_nrcpus(struct perf_header *ph, int fd, FILE *fp)
1055{
1056 ssize_t ret;
1057 u32 nr;
1058
1059 ret = read(fd, &nr, sizeof(nr));
1060 if (ret != (ssize_t)sizeof(nr))
1061 nr = -1; /* interpreted as error */
1062
1063 if (ph->needs_swap)
1064 nr = bswap_32(nr);
1065
1066 fprintf(fp, "# nrcpus online : %u\n", nr);
1067
1068 ret = read(fd, &nr, sizeof(nr));
1069 if (ret != (ssize_t)sizeof(nr))
1070 nr = -1; /* interpreted as error */
1071
1072 if (ph->needs_swap)
1073 nr = bswap_32(nr);
1074
1075 fprintf(fp, "# nrcpus avail : %u\n", nr);
1076}
1077
1078static void print_version(struct perf_header *ph, int fd, FILE *fp)
1079{
1080 char *str = do_read_string(fd, ph);
1081 fprintf(fp, "# perf version : %s\n", str);
1082 free(str);
1083}
1084
1085static void print_cmdline(struct perf_header *ph, int fd, FILE *fp)
1086{
1087 ssize_t ret;
1088 char *str;
1089 u32 nr, i;
1090
1091 ret = read(fd, &nr, sizeof(nr));
1092 if (ret != (ssize_t)sizeof(nr))
1093 return;
1094
1095 if (ph->needs_swap)
1096 nr = bswap_32(nr);
1097
1098 fprintf(fp, "# cmdline : ");
1099
1100 for (i = 0; i < nr; i++) {
1101 str = do_read_string(fd, ph);
1102 fprintf(fp, "%s ", str);
1103 free(str);
1104 }
1105 fputc('\n', fp);
1106}
1107
1108static void print_cpu_topology(struct perf_header *ph, int fd, FILE *fp)
1109{
1110 ssize_t ret;
1111 u32 nr, i;
1112 char *str;
1113
1114 ret = read(fd, &nr, sizeof(nr));
1115 if (ret != (ssize_t)sizeof(nr))
1116 return;
1117
1118 if (ph->needs_swap)
1119 nr = bswap_32(nr);
1120
1121 for (i = 0; i < nr; i++) {
1122 str = do_read_string(fd, ph);
1123 fprintf(fp, "# sibling cores : %s\n", str);
1124 free(str);
1125 }
1126
1127 ret = read(fd, &nr, sizeof(nr));
1128 if (ret != (ssize_t)sizeof(nr))
1129 return;
1130
1131 if (ph->needs_swap)
1132 nr = bswap_32(nr);
1133
1134 for (i = 0; i < nr; i++) {
1135 str = do_read_string(fd, ph);
1136 fprintf(fp, "# sibling threads : %s\n", str);
1137 free(str);
1138 }
1139}
1140
1141static void print_event_desc(struct perf_header *ph, int fd, FILE *fp)
1142{
1143 struct perf_event_attr attr;
1144 uint64_t id;
1145 void *buf = NULL;
1146 char *str;
62db9068
SE		 1147 u32 nre, sz, nr, i, j;
1148 ssize_t ret;
1149 size_t msz;
fbe96f29
SE		 1150
1151 /* number of events */
1152 ret = read(fd, &nre, sizeof(nre));
1153 if (ret != (ssize_t)sizeof(nre))
1154 goto error;
1155
1156 if (ph->needs_swap)
1157 nre = bswap_32(nre);
1158
1159 ret = read(fd, &sz, sizeof(sz));
1160 if (ret != (ssize_t)sizeof(sz))
1161 goto error;
1162
1163 if (ph->needs_swap)
1164 sz = bswap_32(sz);
1165
fbe96f29
SE		 1166 memset(&attr, 0, sizeof(attr));
1167
62db9068 1168 /* buffer to hold on file attr struct */
fbe96f29
SE		 1169 buf = malloc(sz);
1170 if (!buf)
1171 goto error;
1172
1173 msz = sizeof(attr);
62db9068 1174 if (sz < (ssize_t)msz)
fbe96f29
SE		 1175 msz = sz;
1176
1177 for (i = 0 ; i < nre; i++) {
1178
62db9068
SE		 1179 /*
1180 * must read entire on-file attr struct to
1181 * sync up with layout.
1182 */
fbe96f29
SE		 1183 ret = read(fd, buf, sz);
1184 if (ret != (ssize_t)sz)
1185 goto error;
1186
1187 if (ph->needs_swap)
1188 perf_event__attr_swap(buf);
1189
1190 memcpy(&attr, buf, msz);
1191
1192 ret = read(fd, &nr, sizeof(nr));
1193 if (ret != (ssize_t)sizeof(nr))
1194 goto error;
1195
1196 if (ph->needs_swap)
1197 nr = bswap_32(nr);
1198
1199 str = do_read_string(fd, ph);
1200 fprintf(fp, "# event : name = %s, ", str);
1201 free(str);
1202
1203 fprintf(fp, "type = %d, config = 0x%"PRIx64
1204 ", config1 = 0x%"PRIx64", config2 = 0x%"PRIx64,
1205 attr.type,
1206 (u64)attr.config,
1207 (u64)attr.config1,
1208 (u64)attr.config2);
1209
1210 fprintf(fp, ", excl_usr = %d, excl_kern = %d",
1211 attr.exclude_user,
1212 attr.exclude_kernel);
1213
1214 if (nr)
1215 fprintf(fp, ", id = {");
1216
1217 for (j = 0 ; j < nr; j++) {
1218 ret = read(fd, &id, sizeof(id));
1219 if (ret != (ssize_t)sizeof(id))
1220 goto error;
1221
1222 if (ph->needs_swap)
1223 id = bswap_64(id);
1224
1225 if (j)
1226 fputc(',', fp);
1227
1228 fprintf(fp, " %"PRIu64, id);
1229 }
1230 if (nr && j == nr)
1231 fprintf(fp, " }");
1232 fputc('\n', fp);
1233 }
1234 free(buf);
1235 return;
1236error:
1237 fprintf(fp, "# event desc: not available or unable to read\n");
1238}
1239
1240static void print_total_mem(struct perf_header *h __used, int fd, FILE *fp)
1241{
1242 uint64_t mem;
1243 ssize_t ret;
1244
1245 ret = read(fd, &mem, sizeof(mem));
1246 if (ret != sizeof(mem))
1247 goto error;
1248
1249 if (h->needs_swap)
1250 mem = bswap_64(mem);
1251
1252 fprintf(fp, "# total memory : %"PRIu64" kB\n", mem);
1253 return;
1254error:
1255 fprintf(fp, "# total memory : unknown\n");
1256}
1257
1258static void print_numa_topology(struct perf_header *h __used, int fd, FILE *fp)
1259{
1260 ssize_t ret;
1261 u32 nr, c, i;
1262 char *str;
1263 uint64_t mem_total, mem_free;
1264
1265 /* nr nodes */
1266 ret = read(fd, &nr, sizeof(nr));
1267 if (ret != (ssize_t)sizeof(nr))
1268 goto error;
1269
1270 if (h->needs_swap)
1271 nr = bswap_32(nr);
1272
1273 for (i = 0; i < nr; i++) {
1274
1275 /* node number */
1276 ret = read(fd, &c, sizeof(c));
1277 if (ret != (ssize_t)sizeof(c))
1278 goto error;
1279
1280 if (h->needs_swap)
1281 c = bswap_32(c);
1282
1283 ret = read(fd, &mem_total, sizeof(u64));
1284 if (ret != sizeof(u64))
1285 goto error;
1286
1287 ret = read(fd, &mem_free, sizeof(u64));
1288 if (ret != sizeof(u64))
1289 goto error;
1290
1291 if (h->needs_swap) {
1292 mem_total = bswap_64(mem_total);
1293 mem_free = bswap_64(mem_free);
1294 }
1295
1296 fprintf(fp, "# node%u meminfo : total = %"PRIu64" kB,"
1297 " free = %"PRIu64" kB\n",
1298 c,
1299 mem_total,
1300 mem_free);
1301
1302 str = do_read_string(fd, h);
1303 fprintf(fp, "# node%u cpu list : %s\n", c, str);
1304 free(str);
1305 }
1306 return;
1307error:
1308 fprintf(fp, "# numa topology : not available\n");
1309}
1310
1311static void print_cpuid(struct perf_header *ph, int fd, FILE *fp)
1312{
1313 char *str = do_read_string(fd, ph);
1314 fprintf(fp, "# cpuid : %s\n", str);
1315 free(str);
1316}
1317
08d95bd2
RR		 1318static int __event_process_build_id(struct build_id_event *bev,
1319 char *filename,
1320 struct perf_session *session)
1321{
1322 int err = -1;
1323 struct list_head *head;
1324 struct machine *machine;
1325 u16 misc;
1326 struct dso *dso;
1327 enum dso_kernel_type dso_type;
1328
1329 machine = perf_session__findnew_machine(session, bev->pid);
1330 if (!machine)
1331 goto out;
1332
1333 misc = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1334
1335 switch (misc) {
1336 case PERF_RECORD_MISC_KERNEL:
1337 dso_type = DSO_TYPE_KERNEL;
1338 head = &machine->kernel_dsos;
1339 break;
1340 case PERF_RECORD_MISC_GUEST_KERNEL:
1341 dso_type = DSO_TYPE_GUEST_KERNEL;
1342 head = &machine->kernel_dsos;
1343 break;
1344 case PERF_RECORD_MISC_USER:
1345 case PERF_RECORD_MISC_GUEST_USER:
1346 dso_type = DSO_TYPE_USER;
1347 head = &machine->user_dsos;
1348 break;
1349 default:
1350 goto out;
1351 }
1352
1353 dso = __dsos__findnew(head, filename);
1354 if (dso != NULL) {
1355 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1356
1357 dso__set_build_id(dso, &bev->build_id);
1358
1359 if (filename[0] == '[')
1360 dso->kernel = dso_type;
1361
1362 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
1363 sbuild_id);
1364 pr_debug("build id event received for %s: %s\n",
1365 dso->long_name, sbuild_id);
1366 }
1367
1368 err = 0;
1369out:
1370 return err;
1371}
1372
1373static int perf_header__read_build_ids_abi_quirk(struct perf_header *header,
1374 int input, u64 offset, u64 size)
1375{
1376 struct perf_session *session = container_of(header, struct perf_session, header);
1377 struct {
1378 struct perf_event_header header;
1379 u8 build_id[ALIGN(BUILD_ID_SIZE, sizeof(u64))];
1380 char filename[0];
1381 } old_bev;
1382 struct build_id_event bev;
1383 char filename[PATH_MAX];
1384 u64 limit = offset + size;
1385
1386 while (offset < limit) {
1387 ssize_t len;
1388
1389 if (read(input, &old_bev, sizeof(old_bev)) != sizeof(old_bev))
1390 return -1;
1391
1392 if (header->needs_swap)
1393 perf_event_header__bswap(&old_bev.header);
1394
1395 len = old_bev.header.size - sizeof(old_bev);
1396 if (read(input, filename, len) != len)
1397 return -1;
1398
1399 bev.header = old_bev.header;
1400
1401 /*
1402 * As the pid is the missing value, we need to fill
1403 * it properly. The header.misc value give us nice hint.
1404 */
1405 bev.pid = HOST_KERNEL_ID;
1406 if (bev.header.misc == PERF_RECORD_MISC_GUEST_USER ||
1407 bev.header.misc == PERF_RECORD_MISC_GUEST_KERNEL)
1408 bev.pid = DEFAULT_GUEST_KERNEL_ID;
1409
1410 memcpy(bev.build_id, old_bev.build_id, sizeof(bev.build_id));
1411 __event_process_build_id(&bev, filename, session);
1412
1413 offset += bev.header.size;
1414 }
1415
1416 return 0;
1417}
1418
1419static int perf_header__read_build_ids(struct perf_header *header,
1420 int input, u64 offset, u64 size)
1421{
1422 struct perf_session *session = container_of(header, struct perf_session, header);
1423 struct build_id_event bev;
1424 char filename[PATH_MAX];
1425 u64 limit = offset + size, orig_offset = offset;
1426 int err = -1;
1427
1428 while (offset < limit) {
1429 ssize_t len;
1430
1431 if (read(input, &bev, sizeof(bev)) != sizeof(bev))
1432 goto out;
1433
1434 if (header->needs_swap)
1435 perf_event_header__bswap(&bev.header);
1436
1437 len = bev.header.size - sizeof(bev);
1438 if (read(input, filename, len) != len)
1439 goto out;
1440 /*
1441 * The a1645ce1 changeset:
1442 *
1443 * "perf: 'perf kvm' tool for monitoring guest performance from host"
1444 *
1445 * Added a field to struct build_id_event that broke the file
1446 * format.
1447 *
1448 * Since the kernel build-id is the first entry, process the
1449 * table using the old format if the well known
1450 * '[kernel.kallsyms]' string for the kernel build-id has the
1451 * first 4 characters chopped off (where the pid_t sits).
1452 */
1453 if (memcmp(filename, "nel.kallsyms]", 13) == 0) {
1454 if (lseek(input, orig_offset, SEEK_SET) == (off_t)-1)
1455 return -1;
1456 return perf_header__read_build_ids_abi_quirk(header, input, offset, size);
1457 }
1458
1459 __event_process_build_id(&bev, filename, session);
1460
1461 offset += bev.header.size;
1462 }
1463 err = 0;
1464out:
1465 return err;
1466}
1467
f1c67db7
RR		 1468static int process_trace_info(struct perf_file_section *section __unused,
1469 struct perf_header *ph __unused,
1470 int feat __unused, int fd)
1471{
1472 trace_report(fd, false);
1473 return 0;
1474}
1475
1476static int process_build_id(struct perf_file_section *section,
1477 struct perf_header *ph,
1478 int feat __unused, int fd)
1479{
1480 if (perf_header__read_build_ids(ph, fd, section->offset, section->size))
1481 pr_debug("Failed to read buildids, continuing...\n");
1482 return 0;
1483}
1484
fbe96f29
SE		 1485struct feature_ops {
1486 int (*write)(int fd, struct perf_header *h, struct perf_evlist *evlist);
1487 void (*print)(struct perf_header *h, int fd, FILE *fp);
f1c67db7
RR		 1488 int (*process)(struct perf_file_section *section,
1489 struct perf_header *h, int feat, int fd);
fbe96f29
SE		 1490 const char *name;
1491 bool full_only;
1492};
1493
8cdfa78a
RR		 1494#define FEAT_OPA(n, func) \
1495 [n] = { .name = #n, .write = write_##func, .print = print_##func }
f1c67db7
RR		 1496#define FEAT_OPP(n, func) \
1497 [n] = { .name = #n, .write = write_##func, .print = print_##func, \
1498 .process = process_##func }
8cdfa78a 1499#define FEAT_OPF(n, func) \
f1c67db7
RR		 1500 [n] = { .name = #n, .write = write_##func, .print = print_##func, \
1501 .full_only = true }
8cdfa78a
RR		 1502
1503/* feature_ops not implemented: */
1504#define print_trace_info NULL
1505#define print_build_id NULL
fbe96f29
SE		 1506
1507static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
f1c67db7
RR		 1508 FEAT_OPP(HEADER_TRACE_INFO, trace_info),
1509 FEAT_OPP(HEADER_BUILD_ID, build_id),
8cdfa78a
RR		 1510 FEAT_OPA(HEADER_HOSTNAME, hostname),
1511 FEAT_OPA(HEADER_OSRELEASE, osrelease),
1512 FEAT_OPA(HEADER_VERSION, version),
1513 FEAT_OPA(HEADER_ARCH, arch),
1514 FEAT_OPA(HEADER_NRCPUS, nrcpus),
1515 FEAT_OPA(HEADER_CPUDESC, cpudesc),
1516 FEAT_OPA(HEADER_CPUID, cpuid),
1517 FEAT_OPA(HEADER_TOTAL_MEM, total_mem),
1518 FEAT_OPA(HEADER_EVENT_DESC, event_desc),
1519 FEAT_OPA(HEADER_CMDLINE, cmdline),
1520 FEAT_OPF(HEADER_CPU_TOPOLOGY, cpu_topology),
1521 FEAT_OPF(HEADER_NUMA_TOPOLOGY, numa_topology),
fbe96f29
SE		 1522};
1523
1524struct header_print_data {
1525 FILE *fp;
1526 bool full; /* extended list of headers */
1527};
1528
1529static int perf_file_section__fprintf_info(struct perf_file_section *section,
1530 struct perf_header *ph,
1531 int feat, int fd, void *data)
1532{
1533 struct header_print_data *hd = data;
1534
1535 if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
1536 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
1537 "%d, continuing...\n", section->offset, feat);
1538 return 0;
1539 }
b1e5a9be 1540 if (feat >= HEADER_LAST_FEATURE) {
fbe96f29 1541 pr_warning("unknown feature %d\n", feat);
f7a8a133 1542 return 0;
fbe96f29
SE		 1543 }
1544 if (!feat_ops[feat].print)
1545 return 0;
1546
1547 if (!feat_ops[feat].full_only || hd->full)
1548 feat_ops[feat].print(ph, fd, hd->fp);
1549 else
1550 fprintf(hd->fp, "# %s info available, use -I to display\n",
1551 feat_ops[feat].name);
1552
1553 return 0;
1554}
1555
1556int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
1557{
1558 struct header_print_data hd;
1559 struct perf_header *header = &session->header;
1560 int fd = session->fd;
1561 hd.fp = fp;
1562 hd.full = full;
1563
1564 perf_header__process_sections(header, fd, &hd,
1565 perf_file_section__fprintf_info);
1566 return 0;
1567}
1568
fbe96f29
SE		 1569static int do_write_feat(int fd, struct perf_header *h, int type,
1570 struct perf_file_section **p,
1571 struct perf_evlist *evlist)
1572{
1573 int err;
1574 int ret = 0;
1575
1576 if (perf_header__has_feat(h, type)) {
b1e5a9be
RR		 1577 if (!feat_ops[type].write)
1578 return -1;
fbe96f29
SE		 1579
1580 (*p)->offset = lseek(fd, 0, SEEK_CUR);
1581
1582 err = feat_ops[type].write(fd, h, evlist);
1583 if (err < 0) {
1584 pr_debug("failed to write feature %d\n", type);
1585
1586 /* undo anything written */
1587 lseek(fd, (*p)->offset, SEEK_SET);
1588
1589 return -1;
1590 }
1591 (*p)->size = lseek(fd, 0, SEEK_CUR) - (*p)->offset;
1592 (*p)++;
1593 }
1594 return ret;
1595}
1596
1c0b04d1 1597static int perf_header__adds_write(struct perf_header *header,
361c99a6 1598 struct perf_evlist *evlist, int fd)
2ba08250 1599{
9e827dd0 1600 int nr_sections;
fbe96f29 1601 struct perf_file_section *feat_sec, *p;
9e827dd0
FW		 1602 int sec_size;
1603 u64 sec_start;
b1e5a9be 1604 int feat;
fbe96f29 1605 int err;
9e827dd0 1606
1c0b04d1 1607 nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
9e827dd0 1608 if (!nr_sections)
d5eed904 1609 return 0;
9e827dd0 1610
fbe96f29 1611 feat_sec = p = calloc(sizeof(*feat_sec), nr_sections);
d5eed904
ACM		 1612 if (feat_sec == NULL)
1613 return -ENOMEM;
9e827dd0
FW		 1614
1615 sec_size = sizeof(*feat_sec) * nr_sections;
1616
1c0b04d1 1617 sec_start = header->data_offset + header->data_size;
f887f301 1618 lseek(fd, sec_start + sec_size, SEEK_SET);
2ba08250 1619
b1e5a9be
RR		 1620 for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
1621 if (do_write_feat(fd, header, feat, &p, evlist))
1622 perf_header__clear_feat(header, feat);
1623 }
9e827dd0 1624
f887f301 1625 lseek(fd, sec_start, SEEK_SET);
fbe96f29
SE		 1626 /*
1627 * may write more than needed due to dropped feature, but
1628 * this is okay, reader will skip the mising entries
1629 */
d5eed904
ACM		 1630 err = do_write(fd, feat_sec, sec_size);
1631 if (err < 0)
1632 pr_debug("failed to write feature section\n");
9e827dd0 1633 free(feat_sec);
d5eed904 1634 return err;
9e827dd0 1635}
2ba08250 1636
8dc58101
TZ		 1637int perf_header__write_pipe(int fd)
1638{
1639 struct perf_pipe_file_header f_header;
1640 int err;
1641
1642 f_header = (struct perf_pipe_file_header){
1643 .magic = PERF_MAGIC,
1644 .size = sizeof(f_header),
1645 };
1646
1647 err = do_write(fd, &f_header, sizeof(f_header));
1648 if (err < 0) {
1649 pr_debug("failed to write perf pipe header\n");
1650 return err;
1651 }
1652
1653 return 0;
1654}
1655
a91e5431
ACM		 1656int perf_session__write_header(struct perf_session *session,
1657 struct perf_evlist *evlist,
1658 int fd, bool at_exit)
7c6a1c65
PZ		 1659{
1660 struct perf_file_header f_header;
1661 struct perf_file_attr f_attr;
1c0b04d1 1662 struct perf_header *header = &session->header;
a91e5431
ACM		 1663 struct perf_evsel *attr, *pair = NULL;
1664 int err;
7c6a1c65
PZ		 1665
1666 lseek(fd, sizeof(f_header), SEEK_SET);
1667
a91e5431
ACM		 1668 if (session->evlist != evlist)
1669 pair = list_entry(session->evlist->entries.next, struct perf_evsel, node);
7c6a1c65 1670
a91e5431 1671 list_for_each_entry(attr, &evlist->entries, node) {
7c6a1c65 1672 attr->id_offset = lseek(fd, 0, SEEK_CUR);
d5eed904
ACM		 1673 err = do_write(fd, attr->id, attr->ids * sizeof(u64));
1674 if (err < 0) {
a91e5431 1675out_err_write:
d5eed904
ACM		 1676 pr_debug("failed to write perf header\n");
1677 return err;
1678 }
a91e5431
ACM		 1679 if (session->evlist != evlist) {
1680 err = do_write(fd, pair->id, pair->ids * sizeof(u64));
1681 if (err < 0)
1682 goto out_err_write;
1683 attr->ids += pair->ids;
1684 pair = list_entry(pair->node.next, struct perf_evsel, node);
1685 }
7c6a1c65
PZ		 1686 }
1687
1c0b04d1 1688 header->attr_offset = lseek(fd, 0, SEEK_CUR);
7c6a1c65 1689
a91e5431 1690 list_for_each_entry(attr, &evlist->entries, node) {
7c6a1c65
PZ		 1691 f_attr = (struct perf_file_attr){
1692 .attr = attr->attr,
1693 .ids = {
1694 .offset = attr->id_offset,
1695 .size = attr->ids * sizeof(u64),
1696 }
1697 };
d5eed904
ACM		 1698 err = do_write(fd, &f_attr, sizeof(f_attr));
1699 if (err < 0) {
1700 pr_debug("failed to write perf header attribute\n");
1701 return err;
1702 }
7c6a1c65
PZ		 1703 }
1704
1c0b04d1
ACM		 1705 header->event_offset = lseek(fd, 0, SEEK_CUR);
1706 header->event_size = event_count * sizeof(struct perf_trace_event_type);
d5eed904 1707 if (events) {
1c0b04d1 1708 err = do_write(fd, events, header->event_size);
d5eed904
ACM		 1709 if (err < 0) {
1710 pr_debug("failed to write perf header events\n");
1711 return err;
1712 }
1713 }
8755a8f2 1714
1c0b04d1 1715 header->data_offset = lseek(fd, 0, SEEK_CUR);
7c6a1c65 1716
d5eed904 1717 if (at_exit) {
1c0b04d1 1718 err = perf_header__adds_write(header, evlist, fd);
d5eed904
ACM		 1719 if (err < 0)
1720 return err;
1721 }
9e827dd0 1722
7c6a1c65
PZ		 1723 f_header = (struct perf_file_header){
1724 .magic = PERF_MAGIC,
1725 .size = sizeof(f_header),
1726 .attr_size = sizeof(f_attr),
1727 .attrs = {
1c0b04d1 1728 .offset = header->attr_offset,
a91e5431 1729 .size = evlist->nr_entries * sizeof(f_attr),
7c6a1c65
PZ		 1730 },
1731 .data = {
1c0b04d1
ACM		 1732 .offset = header->data_offset,
1733 .size = header->data_size,
7c6a1c65 1734 },
8755a8f2 1735 .event_types = {
1c0b04d1
ACM		 1736 .offset = header->event_offset,
1737 .size = header->event_size,
8755a8f2 1738 },
7c6a1c65
PZ		 1739 };
1740
1c0b04d1 1741 memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));
2ba08250 1742
7c6a1c65 1743 lseek(fd, 0, SEEK_SET);
d5eed904
ACM		 1744 err = do_write(fd, &f_header, sizeof(f_header));
1745 if (err < 0) {
1746 pr_debug("failed to write perf header\n");
1747 return err;
1748 }
1c0b04d1 1749 lseek(fd, header->data_offset + header->data_size, SEEK_SET);
7c6a1c65 1750
1c0b04d1 1751 header->frozen = 1;
d5eed904 1752 return 0;
7c6a1c65
PZ		 1753}
1754
1c0b04d1 1755static int perf_header__getbuffer64(struct perf_header *header,
ba21594c
ACM		 1756 int fd, void *buf, size_t size)
1757{
1e7972cc 1758 if (readn(fd, buf, size) <= 0)
ba21594c
ACM		 1759 return -1;
1760
1c0b04d1 1761 if (header->needs_swap)
ba21594c
ACM		 1762 mem_bswap_64(buf, size);
1763
1764 return 0;
1765}
1766
1c0b04d1 1767int perf_header__process_sections(struct perf_header *header, int fd,
fbe96f29 1768 void *data,
1c0b04d1 1769 int (*process)(struct perf_file_section *section,
b1e5a9be
RR		 1770 struct perf_header *ph,
1771 int feat, int fd, void *data))
2ba08250 1772{
b1e5a9be 1773 struct perf_file_section *feat_sec, *sec;
9e827dd0
FW		 1774 int nr_sections;
1775 int sec_size;
b1e5a9be
RR		 1776 int feat;
1777 int err;
9e827dd0 1778
1c0b04d1 1779 nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
9e827dd0 1780 if (!nr_sections)
37562eac 1781 return 0;
9e827dd0 1782
b1e5a9be 1783 feat_sec = sec = calloc(sizeof(*feat_sec), nr_sections);
9e827dd0 1784 if (!feat_sec)
37562eac 1785 return -1;
9e827dd0
FW		 1786
1787 sec_size = sizeof(*feat_sec) * nr_sections;
1788
1c0b04d1 1789 lseek(fd, header->data_offset + header->data_size, SEEK_SET);
9e827dd0 1790
b1e5a9be
RR		 1791 err = perf_header__getbuffer64(header, fd, feat_sec, sec_size);
1792 if (err < 0)
769885f3 1793 goto out_free;
9e827dd0 1794
b1e5a9be
RR		 1795 for_each_set_bit(feat, header->adds_features, HEADER_LAST_FEATURE) {
1796 err = process(sec++, header, feat, fd, data);
1797 if (err < 0)
1798 goto out_free;
2ba08250 1799 }
b1e5a9be 1800 err = 0;
769885f3 1801out_free:
37562eac
ACM		 1802 free(feat_sec);
1803 return err;
769885f3 1804}
4778d2e4 1805
114382a0
SE		 1806static const int attr_file_abi_sizes[] = {
1807 [0] = PERF_ATTR_SIZE_VER0,
1808 [1] = PERF_ATTR_SIZE_VER1,
1809 0,
1810};
1811
1812/*
1813 * In the legacy file format, the magic number is not used to encode endianness.
1814 * hdr_sz was used to encode endianness. But given that hdr_sz can vary based
1815 * on ABI revisions, we need to try all combinations for all endianness to
1816 * detect the endianness.
1817 */
1818static int try_all_file_abis(uint64_t hdr_sz, struct perf_header *ph)
73323f54 1819{
114382a0
SE		 1820 uint64_t ref_size, attr_size;
1821 int i;
73323f54 1822
114382a0
SE		 1823 for (i = 0 ; attr_file_abi_sizes[i]; i++) {
1824 ref_size = attr_file_abi_sizes[i]
1825 + sizeof(struct perf_file_section);
1826 if (hdr_sz != ref_size) {
1827 attr_size = bswap_64(hdr_sz);
1828 if (attr_size != ref_size)
1829 continue;
73323f54 1830
114382a0
SE		 1831 ph->needs_swap = true;
1832 }
1833 pr_debug("ABI%d perf.data file detected, need_swap=%d\n",
1834 i,
1835 ph->needs_swap);
1836 return 0;
1837 }
1838 /* could not determine endianness */
1839 return -1;
1840}
73323f54 1841
114382a0
SE		 1842#define PERF_PIPE_HDR_VER0 16
1843
1844static const size_t attr_pipe_abi_sizes[] = {
1845 [0] = PERF_PIPE_HDR_VER0,
1846 0,
1847};
1848
1849/*
1850 * In the legacy pipe format, there is an implicit assumption that endiannesss
1851 * between host recording the samples, and host parsing the samples is the
1852 * same. This is not always the case given that the pipe output may always be
1853 * redirected into a file and analyzed on a different machine with possibly a
1854 * different endianness and perf_event ABI revsions in the perf tool itself.
1855 */
1856static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph)
1857{
1858 u64 attr_size;
1859 int i;
1860
1861 for (i = 0 ; attr_pipe_abi_sizes[i]; i++) {
1862 if (hdr_sz != attr_pipe_abi_sizes[i]) {
1863 attr_size = bswap_64(hdr_sz);
1864 if (attr_size != hdr_sz)
1865 continue;
73323f54
SE		 1866
1867 ph->needs_swap = true;
1868 }
114382a0 1869 pr_debug("Pipe ABI%d perf.data file detected\n", i);
73323f54
SE		 1870 return 0;
1871 }
114382a0
SE		 1872 return -1;
1873}
1874
1875static int check_magic_endian(u64 magic, uint64_t hdr_sz,
1876 bool is_pipe, struct perf_header *ph)
1877{
1878 int ret;
1879
1880 /* check for legacy format */
1881 ret = memcmp(&magic, __perf_magic1, sizeof(magic));
1882 if (ret == 0) {
1883 pr_debug("legacy perf.data format\n");
1884 if (is_pipe)
1885 return try_all_pipe_abis(hdr_sz, ph);
1886
1887 return try_all_file_abis(hdr_sz, ph);
1888 }
1889 /*
1890 * the new magic number serves two purposes:
1891 * - unique number to identify actual perf.data files
1892 * - encode endianness of file
1893 */
73323f54 1894
114382a0
SE		 1895 /* check magic number with one endianness */
1896 if (magic == __perf_magic2)
73323f54
SE		 1897 return 0;
1898
114382a0
SE		 1899 /* check magic number with opposite endianness */
1900 if (magic != __perf_magic2_sw)
73323f54
SE		 1901 return -1;
1902
1903 ph->needs_swap = true;
1904
1905 return 0;
1906}
1907
1c0b04d1 1908int perf_file_header__read(struct perf_file_header *header,
37562eac
ACM		 1909 struct perf_header *ph, int fd)
1910{
73323f54
SE		 1911 int ret;
1912
37562eac 1913 lseek(fd, 0, SEEK_SET);
37562eac 1914
73323f54
SE		 1915 ret = readn(fd, header, sizeof(*header));
1916 if (ret <= 0)
37562eac
ACM		 1917 return -1;
1918
114382a0
SE		 1919 if (check_magic_endian(header->magic,
1920 header->attr_size, false, ph) < 0) {
1921 pr_debug("magic/endian check failed\n");
73323f54 1922 return -1;
114382a0 1923 }
ba21594c 1924
73323f54 1925 if (ph->needs_swap) {
1c0b04d1 1926 mem_bswap_64(header, offsetof(struct perf_file_header,
73323f54 1927 adds_features));
ba21594c
ACM		 1928 }
1929
1c0b04d1 1930 if (header->size != sizeof(*header)) {
37562eac 1931 /* Support the previous format */
1c0b04d1
ACM		 1932 if (header->size == offsetof(typeof(*header), adds_features))
1933 bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
37562eac
ACM		 1934 else
1935 return -1;
d327fa43
DA		 1936 } else if (ph->needs_swap) {
1937 unsigned int i;
1938 /*
1939 * feature bitmap is declared as an array of unsigned longs --
1940 * not good since its size can differ between the host that
1941 * generated the data file and the host analyzing the file.
1942 *
1943 * We need to handle endianness, but we don't know the size of
1944 * the unsigned long where the file was generated. Take a best
1945 * guess at determining it: try 64-bit swap first (ie., file
1946 * created on a 64-bit host), and check if the hostname feature
1947 * bit is set (this feature bit is forced on as of fbe96f2).
1948 * If the bit is not, undo the 64-bit swap and try a 32-bit
1949 * swap. If the hostname bit is still not set (e.g., older data
1950 * file), punt and fallback to the original behavior --
1951 * clearing all feature bits and setting buildid.
1952 */
1953 for (i = 0; i < BITS_TO_LONGS(HEADER_FEAT_BITS); ++i)
1954 header->adds_features[i] = bswap_64(header->adds_features[i]);
1955
1956 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
1957 for (i = 0; i < BITS_TO_LONGS(HEADER_FEAT_BITS); ++i) {
1958 header->adds_features[i] = bswap_64(header->adds_features[i]);
1959 header->adds_features[i] = bswap_32(header->adds_features[i]);
1960 }
1961 }
1962
1963 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
1964 bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
1965 set_bit(HEADER_BUILD_ID, header->adds_features);
1966 }
4778d2e4 1967 }
9e827dd0 1968
1c0b04d1 1969 memcpy(&ph->adds_features, &header->adds_features,
ba21594c 1970 sizeof(ph->adds_features));
37562eac 1971
1c0b04d1
ACM		 1972 ph->event_offset = header->event_types.offset;
1973 ph->event_size = header->event_types.size;
1974 ph->data_offset = header->data.offset;
1975 ph->data_size = header->data.size;
37562eac
ACM		 1976 return 0;
1977}
1978
1c0b04d1 1979static int perf_file_section__process(struct perf_file_section *section,
ba21594c 1980 struct perf_header *ph,
fbe96f29 1981 int feat, int fd, void *data __used)
37562eac 1982{
1c0b04d1 1983 if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
9486aa38 1984 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
1c0b04d1 1985 "%d, continuing...\n", section->offset, feat);
37562eac
ACM		 1986 return 0;
1987 }
1988
b1e5a9be
RR		 1989 if (feat >= HEADER_LAST_FEATURE) {
1990 pr_debug("unknown feature %d, continuing...\n", feat);
1991 return 0;
1992 }
1993
f1c67db7
RR		 1994 if (!feat_ops[feat].process)
1995 return 0;
37562eac 1996
f1c67db7 1997 return feat_ops[feat].process(section, ph, feat, fd);
37562eac 1998}
2ba08250 1999
1c0b04d1 2000static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
454c407e
TZ		 2001 struct perf_header *ph, int fd,
2002 bool repipe)
7c6a1c65 2003{
73323f54
SE		 2004 int ret;
2005
2006 ret = readn(fd, header, sizeof(*header));
2007 if (ret <= 0)
2008 return -1;
2009
114382a0
SE		 2010 if (check_magic_endian(header->magic, header->size, true, ph) < 0) {
2011 pr_debug("endian/magic failed\n");
8dc58101 2012 return -1;
114382a0
SE		 2013 }
2014
2015 if (ph->needs_swap)
2016 header->size = bswap_64(header->size);
8dc58101 2017
1c0b04d1 2018 if (repipe && do_write(STDOUT_FILENO, header, sizeof(*header)) < 0)
454c407e
TZ		 2019 return -1;
2020
8dc58101
TZ		 2021 return 0;
2022}
2023
2024static int perf_header__read_pipe(struct perf_session *session, int fd)
2025{
1c0b04d1 2026 struct perf_header *header = &session->header;
8dc58101
TZ		 2027 struct perf_pipe_file_header f_header;
2028
1c0b04d1 2029 if (perf_file_header__read_pipe(&f_header, header, fd,
454c407e 2030 session->repipe) < 0) {
8dc58101
TZ		 2031 pr_debug("incompatible file format\n");
2032 return -EINVAL;
2033 }
2034
2035 session->fd = fd;
2036
2037 return 0;
2038}
2039
69996df4
SE		 2040static int read_attr(int fd, struct perf_header *ph,
2041 struct perf_file_attr *f_attr)
2042{
2043 struct perf_event_attr *attr = &f_attr->attr;
2044 size_t sz, left;
2045 size_t our_sz = sizeof(f_attr->attr);
2046 int ret;
2047
2048 memset(f_attr, 0, sizeof(*f_attr));
2049
2050 /* read minimal guaranteed structure */
2051 ret = readn(fd, attr, PERF_ATTR_SIZE_VER0);
2052 if (ret <= 0) {
2053 pr_debug("cannot read %d bytes of header attr\n",
2054 PERF_ATTR_SIZE_VER0);
2055 return -1;
2056 }
2057
2058 /* on file perf_event_attr size */
2059 sz = attr->size;
114382a0 2060
69996df4
SE		 2061 if (ph->needs_swap)
2062 sz = bswap_32(sz);
2063
2064 if (sz == 0) {
2065 /* assume ABI0 */
2066 sz = PERF_ATTR_SIZE_VER0;
2067 } else if (sz > our_sz) {
2068 pr_debug("file uses a more recent and unsupported ABI"
2069 " (%zu bytes extra)\n", sz - our_sz);
2070 return -1;
2071 }
2072 /* what we have not yet read and that we know about */
2073 left = sz - PERF_ATTR_SIZE_VER0;
2074 if (left) {
2075 void *ptr = attr;
2076 ptr += PERF_ATTR_SIZE_VER0;
2077
2078 ret = readn(fd, ptr, left);
2079 }
2080 /* read perf_file_section, ids are read in caller */
2081 ret = readn(fd, &f_attr->ids, sizeof(f_attr->ids));
2082
2083 return ret <= 0 ? -1 : 0;
2084}
2085
a91e5431 2086int perf_session__read_header(struct perf_session *session, int fd)
8dc58101 2087{
1c0b04d1 2088 struct perf_header *header = &session->header;
ba21594c 2089 struct perf_file_header f_header;
7c6a1c65
PZ		 2090 struct perf_file_attr f_attr;
2091 u64 f_id;
7c6a1c65
PZ		 2092 int nr_attrs, nr_ids, i, j;
2093
a91e5431
ACM		 2094 session->evlist = perf_evlist__new(NULL, NULL);
2095 if (session->evlist == NULL)
2096 return -ENOMEM;
2097
8dc58101
TZ		 2098 if (session->fd_pipe)
2099 return perf_header__read_pipe(session, fd);
2100
69996df4 2101 if (perf_file_header__read(&f_header, header, fd) < 0)
4dc0a04b 2102 return -EINVAL;
7c6a1c65 2103
69996df4 2104 nr_attrs = f_header.attrs.size / f_header.attr_size;
7c6a1c65
PZ		 2105 lseek(fd, f_header.attrs.offset, SEEK_SET);
2106
2107 for (i = 0; i < nr_attrs; i++) {
a91e5431 2108 struct perf_evsel *evsel;
1c222bce 2109 off_t tmp;
7c6a1c65 2110
69996df4 2111 if (read_attr(fd, header, &f_attr) < 0)
769885f3 2112 goto out_errno;
ba21594c 2113
eda3913b
DA		 2114 if (header->needs_swap)
2115 perf_event__attr_swap(&f_attr.attr);
2116
1c222bce 2117 tmp = lseek(fd, 0, SEEK_CUR);
a91e5431 2118 evsel = perf_evsel__new(&f_attr.attr, i);
7c6a1c65 2119
a91e5431
ACM		 2120 if (evsel == NULL)
2121 goto out_delete_evlist;
2122 /*
2123 * Do it before so that if perf_evsel__alloc_id fails, this
2124 * entry gets purged too at perf_evlist__delete().
2125 */
2126 perf_evlist__add(session->evlist, evsel);
7c6a1c65
PZ		 2127
2128 nr_ids = f_attr.ids.size / sizeof(u64);
a91e5431
ACM		 2129 /*
2130 * We don't have the cpu and thread maps on the header, so
2131 * for allocating the perf_sample_id table we fake 1 cpu and
2132 * hattr->ids threads.
2133 */
2134 if (perf_evsel__alloc_id(evsel, 1, nr_ids))
2135 goto out_delete_evlist;
2136
7c6a1c65
PZ		 2137 lseek(fd, f_attr.ids.offset, SEEK_SET);
2138
2139 for (j = 0; j < nr_ids; j++) {
1c0b04d1 2140 if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))
769885f3 2141 goto out_errno;
7c6a1c65 2142
a91e5431 2143 perf_evlist__id_add(session->evlist, evsel, 0, j, f_id);
7c6a1c65 2144 }
11deb1f9 2145
7c6a1c65
PZ		 2146 lseek(fd, tmp, SEEK_SET);
2147 }
2148
d04b35f8
ACM		 2149 symbol_conf.nr_events = nr_attrs;
2150
8755a8f2
AV		 2151 if (f_header.event_types.size) {
2152 lseek(fd, f_header.event_types.offset, SEEK_SET);
2153 events = malloc(f_header.event_types.size);
4dc0a04b
ACM		 2154 if (events == NULL)
2155 return -ENOMEM;
1c0b04d1 2156 if (perf_header__getbuffer64(header, fd, events,
ba21594c 2157 f_header.event_types.size))
769885f3 2158 goto out_errno;
8755a8f2
AV		 2159 event_count = f_header.event_types.size / sizeof(struct perf_trace_event_type);
2160 }
03456a15 2161
fbe96f29
SE		 2162 perf_header__process_sections(header, fd, NULL,
2163 perf_file_section__process);
4778d2e4 2164
1c0b04d1 2165 lseek(fd, header->data_offset, SEEK_SET);
7c6a1c65 2166
1c0b04d1 2167 header->frozen = 1;
4dc0a04b 2168 return 0;
769885f3
ACM		 2169out_errno:
2170 return -errno;
a91e5431
ACM		 2171
2172out_delete_evlist:
2173 perf_evlist__delete(session->evlist);
2174 session->evlist = NULL;
2175 return -ENOMEM;
7c6a1c65 2176}
0d3a5c88 2177
45694aa7 2178int perf_event__synthesize_attr(struct perf_tool *tool,
d20deb64 2179 struct perf_event_attr *attr, u16 ids, u64 *id,
743eb868 2180 perf_event__handler_t process)
2c46dbb5 2181{
8115d60c 2182 union perf_event *ev;
2c46dbb5
TZ		 2183 size_t size;
2184 int err;
2185
2186 size = sizeof(struct perf_event_attr);
2187 size = ALIGN(size, sizeof(u64));
2188 size += sizeof(struct perf_event_header);
2189 size += ids * sizeof(u64);
2190
2191 ev = malloc(size);
2192
ce47dc56
CS		 2193 if (ev == NULL)
2194 return -ENOMEM;
2195
2c46dbb5
TZ		 2196 ev->attr.attr = *attr;
2197 memcpy(ev->attr.id, id, ids * sizeof(u64));
2198
2199 ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2200 ev->attr.header.size = size;
2201
45694aa7 2202 err = process(tool, ev, NULL, NULL);
2c46dbb5
TZ		 2203
2204 free(ev);
2205
2206 return err;
2207}
2208
45694aa7 2209int perf_event__synthesize_attrs(struct perf_tool *tool,
d20deb64 2210 struct perf_session *session,
a91e5431 2211 perf_event__handler_t process)
2c46dbb5 2212{
a91e5431
ACM		 2213 struct perf_evsel *attr;
2214 int err = 0;
2c46dbb5 2215
a91e5431 2216 list_for_each_entry(attr, &session->evlist->entries, node) {
45694aa7 2217 err = perf_event__synthesize_attr(tool, &attr->attr, attr->ids,
743eb868 2218 attr->id, process);
2c46dbb5
TZ		 2219 if (err) {
2220 pr_debug("failed to create perf header attribute\n");
2221 return err;
2222 }
2223 }
2224
2225 return err;
2226}
2227
8115d60c 2228int perf_event__process_attr(union perf_event *event,
10d0f086 2229 struct perf_evlist **pevlist)
2c46dbb5 2230{
2c46dbb5 2231 unsigned int i, ids, n_ids;
a91e5431 2232 struct perf_evsel *evsel;
10d0f086 2233 struct perf_evlist *evlist = *pevlist;
2c46dbb5 2234
10d0f086
ACM		 2235 if (evlist == NULL) {
2236 *pevlist = evlist = perf_evlist__new(NULL, NULL);
2237 if (evlist == NULL)
a91e5431
ACM		 2238 return -ENOMEM;
2239 }
2240
10d0f086 2241 evsel = perf_evsel__new(&event->attr.attr, evlist->nr_entries);
a91e5431 2242 if (evsel == NULL)
2c46dbb5
TZ		 2243 return -ENOMEM;
2244
10d0f086 2245 perf_evlist__add(evlist, evsel);
a91e5431 2246
8115d60c
ACM		 2247 ids = event->header.size;
2248 ids -= (void *)&event->attr.id - (void *)event;
2c46dbb5 2249 n_ids = ids / sizeof(u64);
a91e5431
ACM		 2250 /*
2251 * We don't have the cpu and thread maps on the header, so
2252 * for allocating the perf_sample_id table we fake 1 cpu and
2253 * hattr->ids threads.
2254 */
2255 if (perf_evsel__alloc_id(evsel, 1, n_ids))
2256 return -ENOMEM;
2c46dbb5
TZ		 2257
2258 for (i = 0; i < n_ids; i++) {
10d0f086 2259 perf_evlist__id_add(evlist, evsel, 0, i, event->attr.id[i]);
2c46dbb5
TZ		 2260 }
2261
2c46dbb5
TZ		 2262 return 0;
2263}
cd19a035 2264
45694aa7 2265int perf_event__synthesize_event_type(struct perf_tool *tool,
d20deb64 2266 u64 event_id, char *name,
8115d60c 2267 perf_event__handler_t process,
743eb868 2268 struct machine *machine)
cd19a035 2269{
8115d60c 2270 union perf_event ev;
cd19a035
TZ		 2271 size_t size = 0;
2272 int err = 0;
2273
2274 memset(&ev, 0, sizeof(ev));
2275
2276 ev.event_type.event_type.event_id = event_id;
2277 memset(ev.event_type.event_type.name, 0, MAX_EVENT_NAME);
2278 strncpy(ev.event_type.event_type.name, name, MAX_EVENT_NAME - 1);
2279
2280 ev.event_type.header.type = PERF_RECORD_HEADER_EVENT_TYPE;
f8f4b287 2281 size = strlen(ev.event_type.event_type.name);
cd19a035
TZ		 2282 size = ALIGN(size, sizeof(u64));
2283 ev.event_type.header.size = sizeof(ev.event_type) -
2284 (sizeof(ev.event_type.event_type.name) - size);
2285
45694aa7 2286 err = process(tool, &ev, NULL, machine);
cd19a035
TZ		 2287
2288 return err;
2289}
2290
45694aa7 2291int perf_event__synthesize_event_types(struct perf_tool *tool,
d20deb64 2292 perf_event__handler_t process,
743eb868 2293 struct machine *machine)
cd19a035
TZ		 2294{
2295 struct perf_trace_event_type *type;
2296 int i, err = 0;
2297
2298 for (i = 0; i < event_count; i++) {
2299 type = &events[i];
2300
45694aa7 2301 err = perf_event__synthesize_event_type(tool, type->event_id,
8115d60c 2302 type->name, process,
743eb868 2303 machine);
cd19a035
TZ		 2304 if (err) {
2305 pr_debug("failed to create perf header event type\n");
2306 return err;
2307 }
2308 }
2309
2310 return err;
2311}
2312
45694aa7 2313int perf_event__process_event_type(struct perf_tool *tool __unused,
743eb868 2314 union perf_event *event)
cd19a035 2315{
8115d60c
ACM		 2316 if (perf_header__push_event(event->event_type.event_type.event_id,
2317 event->event_type.event_type.name) < 0)
cd19a035
TZ		 2318 return -ENOMEM;
2319
2320 return 0;
2321}
9215545e 2322
45694aa7 2323int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd,
d20deb64 2324 struct perf_evlist *evlist,
743eb868 2325 perf_event__handler_t process)
9215545e 2326{
8115d60c 2327 union perf_event ev;
29208e57 2328 struct tracing_data *tdata;
9215545e 2329 ssize_t size = 0, aligned_size = 0, padding;
fb7d0b3c 2330 int err __used = 0;
9215545e 2331
29208e57
JO		 2332 /*
2333 * We are going to store the size of the data followed
2334 * by the data contents. Since the fd descriptor is a pipe,
2335 * we cannot seek back to store the size of the data once
2336 * we know it. Instead we:
2337 *
2338 * - write the tracing data to the temp file
2339 * - get/write the data size to pipe
2340 * - write the tracing data from the temp file
2341 * to the pipe
2342 */
2343 tdata = tracing_data_get(&evlist->entries, fd, true);
2344 if (!tdata)
2345 return -1;
2346
9215545e
TZ		 2347 memset(&ev, 0, sizeof(ev));
2348
2349 ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
29208e57 2350 size = tdata->size;
9215545e
TZ		 2351 aligned_size = ALIGN(size, sizeof(u64));
2352 padding = aligned_size - size;
2353 ev.tracing_data.header.size = sizeof(ev.tracing_data);
2354 ev.tracing_data.size = aligned_size;
2355
45694aa7 2356 process(tool, &ev, NULL, NULL);
9215545e 2357
29208e57
JO		 2358 /*
2359 * The put function will copy all the tracing data
2360 * stored in temp file to the pipe.
2361 */
2362 tracing_data_put(tdata);
2363
9215545e
TZ		 2364 write_padded(fd, NULL, 0, padding);
2365
2366 return aligned_size;
2367}
2368
8115d60c
ACM		 2369int perf_event__process_tracing_data(union perf_event *event,
2370 struct perf_session *session)
9215545e 2371{
8115d60c 2372 ssize_t size_read, padding, size = event->tracing_data.size;
9215545e
TZ		 2373 off_t offset = lseek(session->fd, 0, SEEK_CUR);
2374 char buf[BUFSIZ];
2375
2376 /* setup for reading amidst mmap */
2377 lseek(session->fd, offset + sizeof(struct tracing_data_event),
2378 SEEK_SET);
2379
454c407e 2380 size_read = trace_report(session->fd, session->repipe);
9215545e
TZ		 2381
2382 padding = ALIGN(size_read, sizeof(u64)) - size_read;
2383
2384 if (read(session->fd, buf, padding) < 0)
2385 die("reading input file");
454c407e
TZ		 2386 if (session->repipe) {
2387 int retw = write(STDOUT_FILENO, buf, padding);
2388 if (retw <= 0 || retw != padding)
2389 die("repiping tracing data padding");
2390 }
9215545e
TZ		 2391
2392 if (size_read + padding != size)
2393 die("tracing data size mismatch");
2394
2395 return size_read + padding;
2396}
c7929e47 2397
45694aa7 2398int perf_event__synthesize_build_id(struct perf_tool *tool,
d20deb64 2399 struct dso *pos, u16 misc,
8115d60c 2400 perf_event__handler_t process,
743eb868 2401 struct machine *machine)
c7929e47 2402{
8115d60c 2403 union perf_event ev;
c7929e47
TZ		 2404 size_t len;
2405 int err = 0;
2406
2407 if (!pos->hit)
2408 return err;
2409
2410 memset(&ev, 0, sizeof(ev));
2411
2412 len = pos->long_name_len + 1;
2413 len = ALIGN(len, NAME_ALIGN);
2414 memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
2415 ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
2416 ev.build_id.header.misc = misc;
23346f21 2417 ev.build_id.pid = machine->pid;
c7929e47
TZ		 2418 ev.build_id.header.size = sizeof(ev.build_id) + len;
2419 memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
2420
45694aa7 2421 err = process(tool, &ev, NULL, machine);
c7929e47
TZ		 2422
2423 return err;
2424}
2425
45694aa7 2426int perf_event__process_build_id(struct perf_tool *tool __used,
d20deb64 2427 union perf_event *event,
8115d60c 2428 struct perf_session *session)
c7929e47 2429{
8115d60c
ACM		 2430 __event_process_build_id(&event->build_id,
2431 event->build_id.filename,
a1645ce1 2432 session);
c7929e47
TZ		 2433 return 0;
2434}
a1ac1d3c
SE		 2435
2436void disable_buildid_cache(void)
2437{
2438 no_buildid_cache = true;
2439}
Linux kernel - Deliverables
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