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TOMOYO Linux Cross Reference
Linux/tools/perf/util/header.c

Version: ~ [ linux-4.15-rc3 ] ~ [ linux-4.14.5 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.68 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.105 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.47 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.87 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.51 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.96 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.27.62 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <errno.h>
  3 #include <inttypes.h>
  4 #include "util.h"
  5 #include "string2.h"
  6 #include <sys/param.h>
  7 #include <sys/types.h>
  8 #include <byteswap.h>
  9 #include <unistd.h>
 10 #include <stdio.h>
 11 #include <stdlib.h>
 12 #include <linux/compiler.h>
 13 #include <linux/list.h>
 14 #include <linux/kernel.h>
 15 #include <linux/bitops.h>
 16 #include <linux/stringify.h>
 17 #include <sys/stat.h>
 18 #include <sys/types.h>
 19 #include <sys/utsname.h>
 20 #include <unistd.h>
 21 
 22 #include "evlist.h"
 23 #include "evsel.h"
 24 #include "header.h"
 25 #include "memswap.h"
 26 #include "../perf.h"
 27 #include "trace-event.h"
 28 #include "session.h"
 29 #include "symbol.h"
 30 #include "debug.h"
 31 #include "cpumap.h"
 32 #include "pmu.h"
 33 #include "vdso.h"
 34 #include "strbuf.h"
 35 #include "build-id.h"
 36 #include "data.h"
 37 #include <api/fs/fs.h>
 38 #include "asm/bug.h"
 39 #include "tool.h"
 40 
 41 #include "sane_ctype.h"
 42 
 43 /*
 44  * magic2 = "PERFILE2"
 45  * must be a numerical value to let the endianness
 46  * determine the memory layout. That way we are able
 47  * to detect endianness when reading the perf.data file
 48  * back.
 49  *
 50  * we check for legacy (PERFFILE) format.
 51  */
 52 static const char *__perf_magic1 = "PERFFILE";
 53 static const u64 __perf_magic2    = 0x32454c4946524550ULL;
 54 static const u64 __perf_magic2_sw = 0x50455246494c4532ULL;
 55 
 56 #define PERF_MAGIC      __perf_magic2
 57 
 58 const char perf_version_string[] = PERF_VERSION;
 59 
 60 struct perf_file_attr {
 61         struct perf_event_attr  attr;
 62         struct perf_file_section        ids;
 63 };
 64 
 65 struct feat_fd {
 66         struct perf_header      *ph;
 67         int                     fd;
 68         void                    *buf;   /* Either buf != NULL or fd >= 0 */
 69         ssize_t                 offset;
 70         size_t                  size;
 71         struct perf_evsel       *events;
 72 };
 73 
 74 void perf_header__set_feat(struct perf_header *header, int feat)
 75 {
 76         set_bit(feat, header->adds_features);
 77 }
 78 
 79 void perf_header__clear_feat(struct perf_header *header, int feat)
 80 {
 81         clear_bit(feat, header->adds_features);
 82 }
 83 
 84 bool perf_header__has_feat(const struct perf_header *header, int feat)
 85 {
 86         return test_bit(feat, header->adds_features);
 87 }
 88 
 89 static int __do_write_fd(struct feat_fd *ff, const void *buf, size_t size)
 90 {
 91         ssize_t ret = writen(ff->fd, buf, size);
 92 
 93         if (ret != (ssize_t)size)
 94                 return ret < 0 ? (int)ret : -1;
 95         return 0;
 96 }
 97 
 98 static int __do_write_buf(struct feat_fd *ff,  const void *buf, size_t size)
 99 {
100         /* struct perf_event_header::size is u16 */
101         const size_t max_size = 0xffff - sizeof(struct perf_event_header);
102         size_t new_size = ff->size;
103         void *addr;
104 
105         if (size + ff->offset > max_size)
106                 return -E2BIG;
107 
108         while (size > (new_size - ff->offset))
109                 new_size <<= 1;
110         new_size = min(max_size, new_size);
111 
112         if (ff->size < new_size) {
113                 addr = realloc(ff->buf, new_size);
114                 if (!addr)
115                         return -ENOMEM;
116                 ff->buf = addr;
117                 ff->size = new_size;
118         }
119 
120         memcpy(ff->buf + ff->offset, buf, size);
121         ff->offset += size;
122 
123         return 0;
124 }
125 
126 /* Return: 0 if succeded, -ERR if failed. */
127 int do_write(struct feat_fd *ff, const void *buf, size_t size)
128 {
129         if (!ff->buf)
130                 return __do_write_fd(ff, buf, size);
131         return __do_write_buf(ff, buf, size);
132 }
133 
134 /* Return: 0 if succeded, -ERR if failed. */
135 int write_padded(struct feat_fd *ff, const void *bf,
136                  size_t count, size_t count_aligned)
137 {
138         static const char zero_buf[NAME_ALIGN];
139         int err = do_write(ff, bf, count);
140 
141         if (!err)
142                 err = do_write(ff, zero_buf, count_aligned - count);
143 
144         return err;
145 }
146 
147 #define string_size(str)                                                \
148         (PERF_ALIGN((strlen(str) + 1), NAME_ALIGN) + sizeof(u32))
149 
150 /* Return: 0 if succeded, -ERR if failed. */
151 static int do_write_string(struct feat_fd *ff, const char *str)
152 {
153         u32 len, olen;
154         int ret;
155 
156         olen = strlen(str) + 1;
157         len = PERF_ALIGN(olen, NAME_ALIGN);
158 
159         /* write len, incl. \0 */
160         ret = do_write(ff, &len, sizeof(len));
161         if (ret < 0)
162                 return ret;
163 
164         return write_padded(ff, str, olen, len);
165 }
166 
167 static int __do_read_fd(struct feat_fd *ff, void *addr, ssize_t size)
168 {
169         ssize_t ret = readn(ff->fd, addr, size);
170 
171         if (ret != size)
172                 return ret < 0 ? (int)ret : -1;
173         return 0;
174 }
175 
176 static int __do_read_buf(struct feat_fd *ff, void *addr, ssize_t size)
177 {
178         if (size > (ssize_t)ff->size - ff->offset)
179                 return -1;
180 
181         memcpy(addr, ff->buf + ff->offset, size);
182         ff->offset += size;
183 
184         return 0;
185 
186 }
187 
188 static int __do_read(struct feat_fd *ff, void *addr, ssize_t size)
189 {
190         if (!ff->buf)
191                 return __do_read_fd(ff, addr, size);
192         return __do_read_buf(ff, addr, size);
193 }
194 
195 static int do_read_u32(struct feat_fd *ff, u32 *addr)
196 {
197         int ret;
198 
199         ret = __do_read(ff, addr, sizeof(*addr));
200         if (ret)
201                 return ret;
202 
203         if (ff->ph->needs_swap)
204                 *addr = bswap_32(*addr);
205         return 0;
206 }
207 
208 static int do_read_u64(struct feat_fd *ff, u64 *addr)
209 {
210         int ret;
211 
212         ret = __do_read(ff, addr, sizeof(*addr));
213         if (ret)
214                 return ret;
215 
216         if (ff->ph->needs_swap)
217                 *addr = bswap_64(*addr);
218         return 0;
219 }
220 
221 static char *do_read_string(struct feat_fd *ff)
222 {
223         u32 len;
224         char *buf;
225 
226         if (do_read_u32(ff, &len))
227                 return NULL;
228 
229         buf = malloc(len);
230         if (!buf)
231                 return NULL;
232 
233         if (!__do_read(ff, buf, len)) {
234                 /*
235                  * strings are padded by zeroes
236                  * thus the actual strlen of buf
237                  * may be less than len
238                  */
239                 return buf;
240         }
241 
242         free(buf);
243         return NULL;
244 }
245 
246 static int write_tracing_data(struct feat_fd *ff,
247                               struct perf_evlist *evlist)
248 {
249         if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
250                 return -1;
251 
252         return read_tracing_data(ff->fd, &evlist->entries);
253 }
254 
255 static int write_build_id(struct feat_fd *ff,
256                           struct perf_evlist *evlist __maybe_unused)
257 {
258         struct perf_session *session;
259         int err;
260 
261         session = container_of(ff->ph, struct perf_session, header);
262 
263         if (!perf_session__read_build_ids(session, true))
264                 return -1;
265 
266         if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
267                 return -1;
268 
269         err = perf_session__write_buildid_table(session, ff);
270         if (err < 0) {
271                 pr_debug("failed to write buildid table\n");
272                 return err;
273         }
274         perf_session__cache_build_ids(session);
275 
276         return 0;
277 }
278 
279 static int write_hostname(struct feat_fd *ff,
280                           struct perf_evlist *evlist __maybe_unused)
281 {
282         struct utsname uts;
283         int ret;
284 
285         ret = uname(&uts);
286         if (ret < 0)
287                 return -1;
288 
289         return do_write_string(ff, uts.nodename);
290 }
291 
292 static int write_osrelease(struct feat_fd *ff,
293                            struct perf_evlist *evlist __maybe_unused)
294 {
295         struct utsname uts;
296         int ret;
297 
298         ret = uname(&uts);
299         if (ret < 0)
300                 return -1;
301 
302         return do_write_string(ff, uts.release);
303 }
304 
305 static int write_arch(struct feat_fd *ff,
306                       struct perf_evlist *evlist __maybe_unused)
307 {
308         struct utsname uts;
309         int ret;
310 
311         ret = uname(&uts);
312         if (ret < 0)
313                 return -1;
314 
315         return do_write_string(ff, uts.machine);
316 }
317 
318 static int write_version(struct feat_fd *ff,
319                          struct perf_evlist *evlist __maybe_unused)
320 {
321         return do_write_string(ff, perf_version_string);
322 }
323 
324 static int __write_cpudesc(struct feat_fd *ff, const char *cpuinfo_proc)
325 {
326         FILE *file;
327         char *buf = NULL;
328         char *s, *p;
329         const char *search = cpuinfo_proc;
330         size_t len = 0;
331         int ret = -1;
332 
333         if (!search)
334                 return -1;
335 
336         file = fopen("/proc/cpuinfo", "r");
337         if (!file)
338                 return -1;
339 
340         while (getline(&buf, &len, file) > 0) {
341                 ret = strncmp(buf, search, strlen(search));
342                 if (!ret)
343                         break;
344         }
345 
346         if (ret) {
347                 ret = -1;
348                 goto done;
349         }
350 
351         s = buf;
352 
353         p = strchr(buf, ':');
354         if (p && *(p+1) == ' ' && *(p+2))
355                 s = p + 2;
356         p = strchr(s, '\n');
357         if (p)
358                 *p = '\0';
359 
360         /* squash extra space characters (branding string) */
361         p = s;
362         while (*p) {
363                 if (isspace(*p)) {
364                         char *r = p + 1;
365                         char *q = r;
366                         *p = ' ';
367                         while (*q && isspace(*q))
368                                 q++;
369                         if (q != (p+1))
370                                 while ((*r++ = *q++));
371                 }
372                 p++;
373         }
374         ret = do_write_string(ff, s);
375 done:
376         free(buf);
377         fclose(file);
378         return ret;
379 }
380 
381 static int write_cpudesc(struct feat_fd *ff,
382                        struct perf_evlist *evlist __maybe_unused)
383 {
384         const char *cpuinfo_procs[] = CPUINFO_PROC;
385         unsigned int i;
386 
387         for (i = 0; i < ARRAY_SIZE(cpuinfo_procs); i++) {
388                 int ret;
389                 ret = __write_cpudesc(ff, cpuinfo_procs[i]);
390                 if (ret >= 0)
391                         return ret;
392         }
393         return -1;
394 }
395 
396 
397 static int write_nrcpus(struct feat_fd *ff,
398                         struct perf_evlist *evlist __maybe_unused)
399 {
400         long nr;
401         u32 nrc, nra;
402         int ret;
403 
404         nrc = cpu__max_present_cpu();
405 
406         nr = sysconf(_SC_NPROCESSORS_ONLN);
407         if (nr < 0)
408                 return -1;
409 
410         nra = (u32)(nr & UINT_MAX);
411 
412         ret = do_write(ff, &nrc, sizeof(nrc));
413         if (ret < 0)
414                 return ret;
415 
416         return do_write(ff, &nra, sizeof(nra));
417 }
418 
419 static int write_event_desc(struct feat_fd *ff,
420                             struct perf_evlist *evlist)
421 {
422         struct perf_evsel *evsel;
423         u32 nre, nri, sz;
424         int ret;
425 
426         nre = evlist->nr_entries;
427 
428         /*
429          * write number of events
430          */
431         ret = do_write(ff, &nre, sizeof(nre));
432         if (ret < 0)
433                 return ret;
434 
435         /*
436          * size of perf_event_attr struct
437          */
438         sz = (u32)sizeof(evsel->attr);
439         ret = do_write(ff, &sz, sizeof(sz));
440         if (ret < 0)
441                 return ret;
442 
443         evlist__for_each_entry(evlist, evsel) {
444                 ret = do_write(ff, &evsel->attr, sz);
445                 if (ret < 0)
446                         return ret;
447                 /*
448                  * write number of unique id per event
449                  * there is one id per instance of an event
450                  *
451                  * copy into an nri to be independent of the
452                  * type of ids,
453                  */
454                 nri = evsel->ids;
455                 ret = do_write(ff, &nri, sizeof(nri));
456                 if (ret < 0)
457                         return ret;
458 
459                 /*
460                  * write event string as passed on cmdline
461                  */
462                 ret = do_write_string(ff, perf_evsel__name(evsel));
463                 if (ret < 0)
464                         return ret;
465                 /*
466                  * write unique ids for this event
467                  */
468                 ret = do_write(ff, evsel->id, evsel->ids * sizeof(u64));
469                 if (ret < 0)
470                         return ret;
471         }
472         return 0;
473 }
474 
475 static int write_cmdline(struct feat_fd *ff,
476                          struct perf_evlist *evlist __maybe_unused)
477 {
478         char buf[MAXPATHLEN];
479         u32 n;
480         int i, ret;
481 
482         /* actual path to perf binary */
483         ret = readlink("/proc/self/exe", buf, sizeof(buf) - 1);
484         if (ret <= 0)
485                 return -1;
486 
487         /* readlink() does not add null termination */
488         buf[ret] = '\0';
489 
490         /* account for binary path */
491         n = perf_env.nr_cmdline + 1;
492 
493         ret = do_write(ff, &n, sizeof(n));
494         if (ret < 0)
495                 return ret;
496 
497         ret = do_write_string(ff, buf);
498         if (ret < 0)
499                 return ret;
500 
501         for (i = 0 ; i < perf_env.nr_cmdline; i++) {
502                 ret = do_write_string(ff, perf_env.cmdline_argv[i]);
503                 if (ret < 0)
504                         return ret;
505         }
506         return 0;
507 }
508 
509 #define CORE_SIB_FMT \
510         "/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
511 #define THRD_SIB_FMT \
512         "/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
513 
514 struct cpu_topo {
515         u32 cpu_nr;
516         u32 core_sib;
517         u32 thread_sib;
518         char **core_siblings;
519         char **thread_siblings;
520 };
521 
522 static int build_cpu_topo(struct cpu_topo *tp, int cpu)
523 {
524         FILE *fp;
525         char filename[MAXPATHLEN];
526         char *buf = NULL, *p;
527         size_t len = 0;
528         ssize_t sret;
529         u32 i = 0;
530         int ret = -1;
531 
532         sprintf(filename, CORE_SIB_FMT, cpu);
533         fp = fopen(filename, "r");
534         if (!fp)
535                 goto try_threads;
536 
537         sret = getline(&buf, &len, fp);
538         fclose(fp);
539         if (sret <= 0)
540                 goto try_threads;
541 
542         p = strchr(buf, '\n');
543         if (p)
544                 *p = '\0';
545 
546         for (i = 0; i < tp->core_sib; i++) {
547                 if (!strcmp(buf, tp->core_siblings[i]))
548                         break;
549         }
550         if (i == tp->core_sib) {
551                 tp->core_siblings[i] = buf;
552                 tp->core_sib++;
553                 buf = NULL;
554                 len = 0;
555         }
556         ret = 0;
557 
558 try_threads:
559         sprintf(filename, THRD_SIB_FMT, cpu);
560         fp = fopen(filename, "r");
561         if (!fp)
562                 goto done;
563 
564         if (getline(&buf, &len, fp) <= 0)
565                 goto done;
566 
567         p = strchr(buf, '\n');
568         if (p)
569                 *p = '\0';
570 
571         for (i = 0; i < tp->thread_sib; i++) {
572                 if (!strcmp(buf, tp->thread_siblings[i]))
573                         break;
574         }
575         if (i == tp->thread_sib) {
576                 tp->thread_siblings[i] = buf;
577                 tp->thread_sib++;
578                 buf = NULL;
579         }
580         ret = 0;
581 done:
582         if(fp)
583                 fclose(fp);
584         free(buf);
585         return ret;
586 }
587 
588 static void free_cpu_topo(struct cpu_topo *tp)
589 {
590         u32 i;
591 
592         if (!tp)
593                 return;
594 
595         for (i = 0 ; i < tp->core_sib; i++)
596                 zfree(&tp->core_siblings[i]);
597 
598         for (i = 0 ; i < tp->thread_sib; i++)
599                 zfree(&tp->thread_siblings[i]);
600 
601         free(tp);
602 }
603 
604 static struct cpu_topo *build_cpu_topology(void)
605 {
606         struct cpu_topo *tp = NULL;
607         void *addr;
608         u32 nr, i;
609         size_t sz;
610         long ncpus;
611         int ret = -1;
612         struct cpu_map *map;
613 
614         ncpus = cpu__max_present_cpu();
615 
616         /* build online CPU map */
617         map = cpu_map__new(NULL);
618         if (map == NULL) {
619                 pr_debug("failed to get system cpumap\n");
620                 return NULL;
621         }
622 
623         nr = (u32)(ncpus & UINT_MAX);
624 
625         sz = nr * sizeof(char *);
626         addr = calloc(1, sizeof(*tp) + 2 * sz);
627         if (!addr)
628                 goto out_free;
629 
630         tp = addr;
631         tp->cpu_nr = nr;
632         addr += sizeof(*tp);
633         tp->core_siblings = addr;
634         addr += sz;
635         tp->thread_siblings = addr;
636 
637         for (i = 0; i < nr; i++) {
638                 if (!cpu_map__has(map, i))
639                         continue;
640 
641                 ret = build_cpu_topo(tp, i);
642                 if (ret < 0)
643                         break;
644         }
645 
646 out_free:
647         cpu_map__put(map);
648         if (ret) {
649                 free_cpu_topo(tp);
650                 tp = NULL;
651         }
652         return tp;
653 }
654 
655 static int write_cpu_topology(struct feat_fd *ff,
656                               struct perf_evlist *evlist __maybe_unused)
657 {
658         struct cpu_topo *tp;
659         u32 i;
660         int ret, j;
661 
662         tp = build_cpu_topology();
663         if (!tp)
664                 return -1;
665 
666         ret = do_write(ff, &tp->core_sib, sizeof(tp->core_sib));
667         if (ret < 0)
668                 goto done;
669 
670         for (i = 0; i < tp->core_sib; i++) {
671                 ret = do_write_string(ff, tp->core_siblings[i]);
672                 if (ret < 0)
673                         goto done;
674         }
675         ret = do_write(ff, &tp->thread_sib, sizeof(tp->thread_sib));
676         if (ret < 0)
677                 goto done;
678 
679         for (i = 0; i < tp->thread_sib; i++) {
680                 ret = do_write_string(ff, tp->thread_siblings[i]);
681                 if (ret < 0)
682                         break;
683         }
684 
685         ret = perf_env__read_cpu_topology_map(&perf_env);
686         if (ret < 0)
687                 goto done;
688 
689         for (j = 0; j < perf_env.nr_cpus_avail; j++) {
690                 ret = do_write(ff, &perf_env.cpu[j].core_id,
691                                sizeof(perf_env.cpu[j].core_id));
692                 if (ret < 0)
693                         return ret;
694                 ret = do_write(ff, &perf_env.cpu[j].socket_id,
695                                sizeof(perf_env.cpu[j].socket_id));
696                 if (ret < 0)
697                         return ret;
698         }
699 done:
700         free_cpu_topo(tp);
701         return ret;
702 }
703 
704 
705 
706 static int write_total_mem(struct feat_fd *ff,
707                            struct perf_evlist *evlist __maybe_unused)
708 {
709         char *buf = NULL;
710         FILE *fp;
711         size_t len = 0;
712         int ret = -1, n;
713         uint64_t mem;
714 
715         fp = fopen("/proc/meminfo", "r");
716         if (!fp)
717                 return -1;
718 
719         while (getline(&buf, &len, fp) > 0) {
720                 ret = strncmp(buf, "MemTotal:", 9);
721                 if (!ret)
722                         break;
723         }
724         if (!ret) {
725                 n = sscanf(buf, "%*s %"PRIu64, &mem);
726                 if (n == 1)
727                         ret = do_write(ff, &mem, sizeof(mem));
728         } else
729                 ret = -1;
730         free(buf);
731         fclose(fp);
732         return ret;
733 }
734 
735 static int write_topo_node(struct feat_fd *ff, int node)
736 {
737         char str[MAXPATHLEN];
738         char field[32];
739         char *buf = NULL, *p;
740         size_t len = 0;
741         FILE *fp;
742         u64 mem_total, mem_free, mem;
743         int ret = -1;
744 
745         sprintf(str, "/sys/devices/system/node/node%d/meminfo", node);
746         fp = fopen(str, "r");
747         if (!fp)
748                 return -1;
749 
750         while (getline(&buf, &len, fp) > 0) {
751                 /* skip over invalid lines */
752                 if (!strchr(buf, ':'))
753                         continue;
754                 if (sscanf(buf, "%*s %*d %31s %"PRIu64, field, &mem) != 2)
755                         goto done;
756                 if (!strcmp(field, "MemTotal:"))
757                         mem_total = mem;
758                 if (!strcmp(field, "MemFree:"))
759                         mem_free = mem;
760         }
761 
762         fclose(fp);
763         fp = NULL;
764 
765         ret = do_write(ff, &mem_total, sizeof(u64));
766         if (ret)
767                 goto done;
768 
769         ret = do_write(ff, &mem_free, sizeof(u64));
770         if (ret)
771                 goto done;
772 
773         ret = -1;
774         sprintf(str, "/sys/devices/system/node/node%d/cpulist", node);
775 
776         fp = fopen(str, "r");
777         if (!fp)
778                 goto done;
779 
780         if (getline(&buf, &len, fp) <= 0)
781                 goto done;
782 
783         p = strchr(buf, '\n');
784         if (p)
785                 *p = '\0';
786 
787         ret = do_write_string(ff, buf);
788 done:
789         free(buf);
790         if (fp)
791                 fclose(fp);
792         return ret;
793 }
794 
795 static int write_numa_topology(struct feat_fd *ff,
796                                struct perf_evlist *evlist __maybe_unused)
797 {
798         char *buf = NULL;
799         size_t len = 0;
800         FILE *fp;
801         struct cpu_map *node_map = NULL;
802         char *c;
803         u32 nr, i, j;
804         int ret = -1;
805 
806         fp = fopen("/sys/devices/system/node/online", "r");
807         if (!fp)
808                 return -1;
809 
810         if (getline(&buf, &len, fp) <= 0)
811                 goto done;
812 
813         c = strchr(buf, '\n');
814         if (c)
815                 *c = '\0';
816 
817         node_map = cpu_map__new(buf);
818         if (!node_map)
819                 goto done;
820 
821         nr = (u32)node_map->nr;
822 
823         ret = do_write(ff, &nr, sizeof(nr));
824         if (ret < 0)
825                 goto done;
826 
827         for (i = 0; i < nr; i++) {
828                 j = (u32)node_map->map[i];
829                 ret = do_write(ff, &j, sizeof(j));
830                 if (ret < 0)
831                         break;
832 
833                 ret = write_topo_node(ff, i);
834                 if (ret < 0)
835                         break;
836         }
837 done:
838         free(buf);
839         fclose(fp);
840         cpu_map__put(node_map);
841         return ret;
842 }
843 
844 /*
845  * File format:
846  *
847  * struct pmu_mappings {
848  *      u32     pmu_num;
849  *      struct pmu_map {
850  *              u32     type;
851  *              char    name[];
852  *      }[pmu_num];
853  * };
854  */
855 
856 static int write_pmu_mappings(struct feat_fd *ff,
857                               struct perf_evlist *evlist __maybe_unused)
858 {
859         struct perf_pmu *pmu = NULL;
860         u32 pmu_num = 0;
861         int ret;
862 
863         /*
864          * Do a first pass to count number of pmu to avoid lseek so this
865          * works in pipe mode as well.
866          */
867         while ((pmu = perf_pmu__scan(pmu))) {
868                 if (!pmu->name)
869                         continue;
870                 pmu_num++;
871         }
872 
873         ret = do_write(ff, &pmu_num, sizeof(pmu_num));
874         if (ret < 0)
875                 return ret;
876 
877         while ((pmu = perf_pmu__scan(pmu))) {
878                 if (!pmu->name)
879                         continue;
880 
881                 ret = do_write(ff, &pmu->type, sizeof(pmu->type));
882                 if (ret < 0)
883                         return ret;
884 
885                 ret = do_write_string(ff, pmu->name);
886                 if (ret < 0)
887                         return ret;
888         }
889 
890         return 0;
891 }
892 
893 /*
894  * File format:
895  *
896  * struct group_descs {
897  *      u32     nr_groups;
898  *      struct group_desc {
899  *              char    name[];
900  *              u32     leader_idx;
901  *              u32     nr_members;
902  *      }[nr_groups];
903  * };
904  */
905 static int write_group_desc(struct feat_fd *ff,
906                             struct perf_evlist *evlist)
907 {
908         u32 nr_groups = evlist->nr_groups;
909         struct perf_evsel *evsel;
910         int ret;
911 
912         ret = do_write(ff, &nr_groups, sizeof(nr_groups));
913         if (ret < 0)
914                 return ret;
915 
916         evlist__for_each_entry(evlist, evsel) {
917                 if (perf_evsel__is_group_leader(evsel) &&
918                     evsel->nr_members > 1) {
919                         const char *name = evsel->group_name ?: "{anon_group}";
920                         u32 leader_idx = evsel->idx;
921                         u32 nr_members = evsel->nr_members;
922 
923                         ret = do_write_string(ff, name);
924                         if (ret < 0)
925                                 return ret;
926 
927                         ret = do_write(ff, &leader_idx, sizeof(leader_idx));
928                         if (ret < 0)
929                                 return ret;
930 
931                         ret = do_write(ff, &nr_members, sizeof(nr_members));
932                         if (ret < 0)
933                                 return ret;
934                 }
935         }
936         return 0;
937 }
938 
939 /*
940  * default get_cpuid(): nothing gets recorded
941  * actual implementation must be in arch/$(SRCARCH)/util/header.c
942  */
943 int __weak get_cpuid(char *buffer __maybe_unused, size_t sz __maybe_unused)
944 {
945         return -1;
946 }
947 
948 static int write_cpuid(struct feat_fd *ff,
949                        struct perf_evlist *evlist __maybe_unused)
950 {
951         char buffer[64];
952         int ret;
953 
954         ret = get_cpuid(buffer, sizeof(buffer));
955         if (!ret)
956                 goto write_it;
957 
958         return -1;
959 write_it:
960         return do_write_string(ff, buffer);
961 }
962 
963 static int write_branch_stack(struct feat_fd *ff __maybe_unused,
964                               struct perf_evlist *evlist __maybe_unused)
965 {
966         return 0;
967 }
968 
969 static int write_auxtrace(struct feat_fd *ff,
970                           struct perf_evlist *evlist __maybe_unused)
971 {
972         struct perf_session *session;
973         int err;
974 
975         if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
976                 return -1;
977 
978         session = container_of(ff->ph, struct perf_session, header);
979 
980         err = auxtrace_index__write(ff->fd, &session->auxtrace_index);
981         if (err < 0)
982                 pr_err("Failed to write auxtrace index\n");
983         return err;
984 }
985 
986 static int cpu_cache_level__sort(const void *a, const void *b)
987 {
988         struct cpu_cache_level *cache_a = (struct cpu_cache_level *)a;
989         struct cpu_cache_level *cache_b = (struct cpu_cache_level *)b;
990 
991         return cache_a->level - cache_b->level;
992 }
993 
994 static bool cpu_cache_level__cmp(struct cpu_cache_level *a, struct cpu_cache_level *b)
995 {
996         if (a->level != b->level)
997                 return false;
998 
999         if (a->line_size != b->line_size)
1000                 return false;
1001 
1002         if (a->sets != b->sets)
1003                 return false;
1004 
1005         if (a->ways != b->ways)
1006                 return false;
1007 
1008         if (strcmp(a->type, b->type))
1009                 return false;
1010 
1011         if (strcmp(a->size, b->size))
1012                 return false;
1013 
1014         if (strcmp(a->map, b->map))
1015                 return false;
1016 
1017         return true;
1018 }
1019 
1020 static int cpu_cache_level__read(struct cpu_cache_level *cache, u32 cpu, u16 level)
1021 {
1022         char path[PATH_MAX], file[PATH_MAX];
1023         struct stat st;
1024         size_t len;
1025 
1026         scnprintf(path, PATH_MAX, "devices/system/cpu/cpu%d/cache/index%d/", cpu, level);
1027         scnprintf(file, PATH_MAX, "%s/%s", sysfs__mountpoint(), path);
1028 
1029         if (stat(file, &st))
1030                 return 1;
1031 
1032         scnprintf(file, PATH_MAX, "%s/level", path);
1033         if (sysfs__read_int(file, (int *) &cache->level))
1034                 return -1;
1035 
1036         scnprintf(file, PATH_MAX, "%s/coherency_line_size", path);
1037         if (sysfs__read_int(file, (int *) &cache->line_size))
1038                 return -1;
1039 
1040         scnprintf(file, PATH_MAX, "%s/number_of_sets", path);
1041         if (sysfs__read_int(file, (int *) &cache->sets))
1042                 return -1;
1043 
1044         scnprintf(file, PATH_MAX, "%s/ways_of_associativity", path);
1045         if (sysfs__read_int(file, (int *) &cache->ways))
1046                 return -1;
1047 
1048         scnprintf(file, PATH_MAX, "%s/type", path);
1049         if (sysfs__read_str(file, &cache->type, &len))
1050                 return -1;
1051 
1052         cache->type[len] = 0;
1053         cache->type = rtrim(cache->type);
1054 
1055         scnprintf(file, PATH_MAX, "%s/size", path);
1056         if (sysfs__read_str(file, &cache->size, &len)) {
1057                 free(cache->type);
1058                 return -1;
1059         }
1060 
1061         cache->size[len] = 0;
1062         cache->size = rtrim(cache->size);
1063 
1064         scnprintf(file, PATH_MAX, "%s/shared_cpu_list", path);
1065         if (sysfs__read_str(file, &cache->map, &len)) {
1066                 free(cache->map);
1067                 free(cache->type);
1068                 return -1;
1069         }
1070 
1071         cache->map[len] = 0;
1072         cache->map = rtrim(cache->map);
1073         return 0;
1074 }
1075 
1076 static void cpu_cache_level__fprintf(FILE *out, struct cpu_cache_level *c)
1077 {
1078         fprintf(out, "L%d %-15s %8s [%s]\n", c->level, c->type, c->size, c->map);
1079 }
1080 
1081 static int build_caches(struct cpu_cache_level caches[], u32 size, u32 *cntp)
1082 {
1083         u32 i, cnt = 0;
1084         long ncpus;
1085         u32 nr, cpu;
1086         u16 level;
1087 
1088         ncpus = sysconf(_SC_NPROCESSORS_CONF);
1089         if (ncpus < 0)
1090                 return -1;
1091 
1092         nr = (u32)(ncpus & UINT_MAX);
1093 
1094         for (cpu = 0; cpu < nr; cpu++) {
1095                 for (level = 0; level < 10; level++) {
1096                         struct cpu_cache_level c;
1097                         int err;
1098 
1099                         err = cpu_cache_level__read(&c, cpu, level);
1100                         if (err < 0)
1101                                 return err;
1102 
1103                         if (err == 1)
1104                                 break;
1105 
1106                         for (i = 0; i < cnt; i++) {
1107                                 if (cpu_cache_level__cmp(&c, &caches[i]))
1108                                         break;
1109                         }
1110 
1111                         if (i == cnt)
1112                                 caches[cnt++] = c;
1113                         else
1114                                 cpu_cache_level__free(&c);
1115 
1116                         if (WARN_ONCE(cnt == size, "way too many cpu caches.."))
1117                                 goto out;
1118                 }
1119         }
1120  out:
1121         *cntp = cnt;
1122         return 0;
1123 }
1124 
1125 #define MAX_CACHES 2000
1126 
1127 static int write_cache(struct feat_fd *ff,
1128                        struct perf_evlist *evlist __maybe_unused)
1129 {
1130         struct cpu_cache_level caches[MAX_CACHES];
1131         u32 cnt = 0, i, version = 1;
1132         int ret;
1133 
1134         ret = build_caches(caches, MAX_CACHES, &cnt);
1135         if (ret)
1136                 goto out;
1137 
1138         qsort(&caches, cnt, sizeof(struct cpu_cache_level), cpu_cache_level__sort);
1139 
1140         ret = do_write(ff, &version, sizeof(u32));
1141         if (ret < 0)
1142                 goto out;
1143 
1144         ret = do_write(ff, &cnt, sizeof(u32));
1145         if (ret < 0)
1146                 goto out;
1147 
1148         for (i = 0; i < cnt; i++) {
1149                 struct cpu_cache_level *c = &caches[i];
1150 
1151                 #define _W(v)                                   \
1152                         ret = do_write(ff, &c->v, sizeof(u32)); \
1153                         if (ret < 0)                            \
1154                                 goto out;
1155 
1156                 _W(level)
1157                 _W(line_size)
1158                 _W(sets)
1159                 _W(ways)
1160                 #undef _W
1161 
1162                 #define _W(v)                                           \
1163                         ret = do_write_string(ff, (const char *) c->v); \
1164                         if (ret < 0)                                    \
1165                                 goto out;
1166 
1167                 _W(type)
1168                 _W(size)
1169                 _W(map)
1170                 #undef _W
1171         }
1172 
1173 out:
1174         for (i = 0; i < cnt; i++)
1175                 cpu_cache_level__free(&caches[i]);
1176         return ret;
1177 }
1178 
1179 static int write_stat(struct feat_fd *ff __maybe_unused,
1180                       struct perf_evlist *evlist __maybe_unused)
1181 {
1182         return 0;
1183 }
1184 
1185 static void print_hostname(struct feat_fd *ff, FILE *fp)
1186 {
1187         fprintf(fp, "# hostname : %s\n", ff->ph->env.hostname);
1188 }
1189 
1190 static void print_osrelease(struct feat_fd *ff, FILE *fp)
1191 {
1192         fprintf(fp, "# os release : %s\n", ff->ph->env.os_release);
1193 }
1194 
1195 static void print_arch(struct feat_fd *ff, FILE *fp)
1196 {
1197         fprintf(fp, "# arch : %s\n", ff->ph->env.arch);
1198 }
1199 
1200 static void print_cpudesc(struct feat_fd *ff, FILE *fp)
1201 {
1202         fprintf(fp, "# cpudesc : %s\n", ff->ph->env.cpu_desc);
1203 }
1204 
1205 static void print_nrcpus(struct feat_fd *ff, FILE *fp)
1206 {
1207         fprintf(fp, "# nrcpus online : %u\n", ff->ph->env.nr_cpus_online);
1208         fprintf(fp, "# nrcpus avail : %u\n", ff->ph->env.nr_cpus_avail);
1209 }
1210 
1211 static void print_version(struct feat_fd *ff, FILE *fp)
1212 {
1213         fprintf(fp, "# perf version : %s\n", ff->ph->env.version);
1214 }
1215 
1216 static void print_cmdline(struct feat_fd *ff, FILE *fp)
1217 {
1218         int nr, i;
1219 
1220         nr = ff->ph->env.nr_cmdline;
1221 
1222         fprintf(fp, "# cmdline : ");
1223 
1224         for (i = 0; i < nr; i++)
1225                 fprintf(fp, "%s ", ff->ph->env.cmdline_argv[i]);
1226         fputc('\n', fp);
1227 }
1228 
1229 static void print_cpu_topology(struct feat_fd *ff, FILE *fp)
1230 {
1231         struct perf_header *ph = ff->ph;
1232         int cpu_nr = ph->env.nr_cpus_avail;
1233         int nr, i;
1234         char *str;
1235 
1236         nr = ph->env.nr_sibling_cores;
1237         str = ph->env.sibling_cores;
1238 
1239         for (i = 0; i < nr; i++) {
1240                 fprintf(fp, "# sibling cores   : %s\n", str);
1241                 str += strlen(str) + 1;
1242         }
1243 
1244         nr = ph->env.nr_sibling_threads;
1245         str = ph->env.sibling_threads;
1246 
1247         for (i = 0; i < nr; i++) {
1248                 fprintf(fp, "# sibling threads : %s\n", str);
1249                 str += strlen(str) + 1;
1250         }
1251 
1252         if (ph->env.cpu != NULL) {
1253                 for (i = 0; i < cpu_nr; i++)
1254                         fprintf(fp, "# CPU %d: Core ID %d, Socket ID %d\n", i,
1255                                 ph->env.cpu[i].core_id, ph->env.cpu[i].socket_id);
1256         } else
1257                 fprintf(fp, "# Core ID and Socket ID information is not available\n");
1258 }
1259 
1260 static void free_event_desc(struct perf_evsel *events)
1261 {
1262         struct perf_evsel *evsel;
1263 
1264         if (!events)
1265                 return;
1266 
1267         for (evsel = events; evsel->attr.size; evsel++) {
1268                 zfree(&evsel->name);
1269                 zfree(&evsel->id);
1270         }
1271 
1272         free(events);
1273 }
1274 
1275 static struct perf_evsel *read_event_desc(struct feat_fd *ff)
1276 {
1277         struct perf_evsel *evsel, *events = NULL;
1278         u64 *id;
1279         void *buf = NULL;
1280         u32 nre, sz, nr, i, j;
1281         size_t msz;
1282 
1283         /* number of events */
1284         if (do_read_u32(ff, &nre))
1285                 goto error;
1286 
1287         if (do_read_u32(ff, &sz))
1288                 goto error;
1289 
1290         /* buffer to hold on file attr struct */
1291         buf = malloc(sz);
1292         if (!buf)
1293                 goto error;
1294 
1295         /* the last event terminates with evsel->attr.size == 0: */
1296         events = calloc(nre + 1, sizeof(*events));
1297         if (!events)
1298                 goto error;
1299 
1300         msz = sizeof(evsel->attr);
1301         if (sz < msz)
1302                 msz = sz;
1303 
1304         for (i = 0, evsel = events; i < nre; evsel++, i++) {
1305                 evsel->idx = i;
1306 
1307                 /*
1308                  * must read entire on-file attr struct to
1309                  * sync up with layout.
1310                  */
1311                 if (__do_read(ff, buf, sz))
1312                         goto error;
1313 
1314                 if (ff->ph->needs_swap)
1315                         perf_event__attr_swap(buf);
1316 
1317                 memcpy(&evsel->attr, buf, msz);
1318 
1319                 if (do_read_u32(ff, &nr))
1320                         goto error;
1321 
1322                 if (ff->ph->needs_swap)
1323                         evsel->needs_swap = true;
1324 
1325                 evsel->name = do_read_string(ff);
1326                 if (!evsel->name)
1327                         goto error;
1328 
1329                 if (!nr)
1330                         continue;
1331 
1332                 id = calloc(nr, sizeof(*id));
1333                 if (!id)
1334                         goto error;
1335                 evsel->ids = nr;
1336                 evsel->id = id;
1337 
1338                 for (j = 0 ; j < nr; j++) {
1339                         if (do_read_u64(ff, id))
1340                                 goto error;
1341                         id++;
1342                 }
1343         }
1344 out:
1345         free(buf);
1346         return events;
1347 error:
1348         free_event_desc(events);
1349         events = NULL;
1350         goto out;
1351 }
1352 
1353 static int __desc_attr__fprintf(FILE *fp, const char *name, const char *val,
1354                                 void *priv __maybe_unused)
1355 {
1356         return fprintf(fp, ", %s = %s", name, val);
1357 }
1358 
1359 static void print_event_desc(struct feat_fd *ff, FILE *fp)
1360 {
1361         struct perf_evsel *evsel, *events;
1362         u32 j;
1363         u64 *id;
1364 
1365         if (ff->events)
1366                 events = ff->events;
1367         else
1368                 events = read_event_desc(ff);
1369 
1370         if (!events) {
1371                 fprintf(fp, "# event desc: not available or unable to read\n");
1372                 return;
1373         }
1374 
1375         for (evsel = events; evsel->attr.size; evsel++) {
1376                 fprintf(fp, "# event : name = %s, ", evsel->name);
1377 
1378                 if (evsel->ids) {
1379                         fprintf(fp, ", id = {");
1380                         for (j = 0, id = evsel->id; j < evsel->ids; j++, id++) {
1381                                 if (j)
1382                                         fputc(',', fp);
1383                                 fprintf(fp, " %"PRIu64, *id);
1384                         }
1385                         fprintf(fp, " }");
1386                 }
1387 
1388                 perf_event_attr__fprintf(fp, &evsel->attr, __desc_attr__fprintf, NULL);
1389 
1390                 fputc('\n', fp);
1391         }
1392 
1393         free_event_desc(events);
1394         ff->events = NULL;
1395 }
1396 
1397 static void print_total_mem(struct feat_fd *ff, FILE *fp)
1398 {
1399         fprintf(fp, "# total memory : %llu kB\n", ff->ph->env.total_mem);
1400 }
1401 
1402 static void print_numa_topology(struct feat_fd *ff, FILE *fp)
1403 {
1404         int i;
1405         struct numa_node *n;
1406 
1407         for (i = 0; i < ff->ph->env.nr_numa_nodes; i++) {
1408                 n = &ff->ph->env.numa_nodes[i];
1409 
1410                 fprintf(fp, "# node%u meminfo  : total = %"PRIu64" kB,"
1411                             " free = %"PRIu64" kB\n",
1412                         n->node, n->mem_total, n->mem_free);
1413 
1414                 fprintf(fp, "# node%u cpu list : ", n->node);
1415                 cpu_map__fprintf(n->map, fp);
1416         }
1417 }
1418 
1419 static void print_cpuid(struct feat_fd *ff, FILE *fp)
1420 {
1421         fprintf(fp, "# cpuid : %s\n", ff->ph->env.cpuid);
1422 }
1423 
1424 static void print_branch_stack(struct feat_fd *ff __maybe_unused, FILE *fp)
1425 {
1426         fprintf(fp, "# contains samples with branch stack\n");
1427 }
1428 
1429 static void print_auxtrace(struct feat_fd *ff __maybe_unused, FILE *fp)
1430 {
1431         fprintf(fp, "# contains AUX area data (e.g. instruction trace)\n");
1432 }
1433 
1434 static void print_stat(struct feat_fd *ff __maybe_unused, FILE *fp)
1435 {
1436         fprintf(fp, "# contains stat data\n");
1437 }
1438 
1439 static void print_cache(struct feat_fd *ff, FILE *fp __maybe_unused)
1440 {
1441         int i;
1442 
1443         fprintf(fp, "# CPU cache info:\n");
1444         for (i = 0; i < ff->ph->env.caches_cnt; i++) {
1445                 fprintf(fp, "#  ");
1446                 cpu_cache_level__fprintf(fp, &ff->ph->env.caches[i]);
1447         }
1448 }
1449 
1450 static void print_pmu_mappings(struct feat_fd *ff, FILE *fp)
1451 {
1452         const char *delimiter = "# pmu mappings: ";
1453         char *str, *tmp;
1454         u32 pmu_num;
1455         u32 type;
1456 
1457         pmu_num = ff->ph->env.nr_pmu_mappings;
1458         if (!pmu_num) {
1459                 fprintf(fp, "# pmu mappings: not available\n");
1460                 return;
1461         }
1462 
1463         str = ff->ph->env.pmu_mappings;
1464 
1465         while (pmu_num) {
1466                 type = strtoul(str, &tmp, 0);
1467                 if (*tmp != ':')
1468                         goto error;
1469 
1470                 str = tmp + 1;
1471                 fprintf(fp, "%s%s = %" PRIu32, delimiter, str, type);
1472 
1473                 delimiter = ", ";
1474                 str += strlen(str) + 1;
1475                 pmu_num--;
1476         }
1477 
1478         fprintf(fp, "\n");
1479 
1480         if (!pmu_num)
1481                 return;
1482 error:
1483         fprintf(fp, "# pmu mappings: unable to read\n");
1484 }
1485 
1486 static void print_group_desc(struct feat_fd *ff, FILE *fp)
1487 {
1488         struct perf_session *session;
1489         struct perf_evsel *evsel;
1490         u32 nr = 0;
1491 
1492         session = container_of(ff->ph, struct perf_session, header);
1493 
1494         evlist__for_each_entry(session->evlist, evsel) {
1495                 if (perf_evsel__is_group_leader(evsel) &&
1496                     evsel->nr_members > 1) {
1497                         fprintf(fp, "# group: %s{%s", evsel->group_name ?: "",
1498                                 perf_evsel__name(evsel));
1499 
1500                         nr = evsel->nr_members - 1;
1501                 } else if (nr) {
1502                         fprintf(fp, ",%s", perf_evsel__name(evsel));
1503 
1504                         if (--nr == 0)
1505                                 fprintf(fp, "}\n");
1506                 }
1507         }
1508 }
1509 
1510 static int __event_process_build_id(struct build_id_event *bev,
1511                                     char *filename,
1512                                     struct perf_session *session)
1513 {
1514         int err = -1;
1515         struct machine *machine;
1516         u16 cpumode;
1517         struct dso *dso;
1518         enum dso_kernel_type dso_type;
1519 
1520         machine = perf_session__findnew_machine(session, bev->pid);
1521         if (!machine)
1522                 goto out;
1523 
1524         cpumode = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1525 
1526         switch (cpumode) {
1527         case PERF_RECORD_MISC_KERNEL:
1528                 dso_type = DSO_TYPE_KERNEL;
1529                 break;
1530         case PERF_RECORD_MISC_GUEST_KERNEL:
1531                 dso_type = DSO_TYPE_GUEST_KERNEL;
1532                 break;
1533         case PERF_RECORD_MISC_USER:
1534         case PERF_RECORD_MISC_GUEST_USER:
1535                 dso_type = DSO_TYPE_USER;
1536                 break;
1537         default:
1538                 goto out;
1539         }
1540 
1541         dso = machine__findnew_dso(machine, filename);
1542         if (dso != NULL) {
1543                 char sbuild_id[SBUILD_ID_SIZE];
1544 
1545                 dso__set_build_id(dso, &bev->build_id);
1546 
1547                 if (dso_type != DSO_TYPE_USER) {
1548                         struct kmod_path m = { .name = NULL, };
1549 
1550                         if (!kmod_path__parse_name(&m, filename) && m.kmod)
1551                                 dso__set_module_info(dso, &m, machine);
1552                         else
1553                                 dso->kernel = dso_type;
1554 
1555                         free(m.name);
1556                 }
1557 
1558                 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
1559                                   sbuild_id);
1560                 pr_debug("build id event received for %s: %s\n",
1561                          dso->long_name, sbuild_id);
1562                 dso__put(dso);
1563         }
1564 
1565         err = 0;
1566 out:
1567         return err;
1568 }
1569 
1570 static int perf_header__read_build_ids_abi_quirk(struct perf_header *header,
1571                                                  int input, u64 offset, u64 size)
1572 {
1573         struct perf_session *session = container_of(header, struct perf_session, header);
1574         struct {
1575                 struct perf_event_header   header;
1576                 u8                         build_id[PERF_ALIGN(BUILD_ID_SIZE, sizeof(u64))];
1577                 char                       filename[0];
1578         } old_bev;
1579         struct build_id_event bev;
1580         char filename[PATH_MAX];
1581         u64 limit = offset + size;
1582 
1583         while (offset < limit) {
1584                 ssize_t len;
1585 
1586                 if (readn(input, &old_bev, sizeof(old_bev)) != sizeof(old_bev))
1587                         return -1;
1588 
1589                 if (header->needs_swap)
1590                         perf_event_header__bswap(&old_bev.header);
1591 
1592                 len = old_bev.header.size - sizeof(old_bev);
1593                 if (readn(input, filename, len) != len)
1594                         return -1;
1595 
1596                 bev.header = old_bev.header;
1597 
1598                 /*
1599                  * As the pid is the missing value, we need to fill
1600                  * it properly. The header.misc value give us nice hint.
1601                  */
1602                 bev.pid = HOST_KERNEL_ID;
1603                 if (bev.header.misc == PERF_RECORD_MISC_GUEST_USER ||
1604                     bev.header.misc == PERF_RECORD_MISC_GUEST_KERNEL)
1605                         bev.pid = DEFAULT_GUEST_KERNEL_ID;
1606 
1607                 memcpy(bev.build_id, old_bev.build_id, sizeof(bev.build_id));
1608                 __event_process_build_id(&bev, filename, session);
1609 
1610                 offset += bev.header.size;
1611         }
1612 
1613         return 0;
1614 }
1615 
1616 static int perf_header__read_build_ids(struct perf_header *header,
1617                                        int input, u64 offset, u64 size)
1618 {
1619         struct perf_session *session = container_of(header, struct perf_session, header);
1620         struct build_id_event bev;
1621         char filename[PATH_MAX];
1622         u64 limit = offset + size, orig_offset = offset;
1623         int err = -1;
1624 
1625         while (offset < limit) {
1626                 ssize_t len;
1627 
1628                 if (readn(input, &bev, sizeof(bev)) != sizeof(bev))
1629                         goto out;
1630 
1631                 if (header->needs_swap)
1632                         perf_event_header__bswap(&bev.header);
1633 
1634                 len = bev.header.size - sizeof(bev);
1635                 if (readn(input, filename, len) != len)
1636                         goto out;
1637                 /*
1638                  * The a1645ce1 changeset:
1639                  *
1640                  * "perf: 'perf kvm' tool for monitoring guest performance from host"
1641                  *
1642                  * Added a field to struct build_id_event that broke the file
1643                  * format.
1644                  *
1645                  * Since the kernel build-id is the first entry, process the
1646                  * table using the old format if the well known
1647                  * '[kernel.kallsyms]' string for the kernel build-id has the
1648                  * first 4 characters chopped off (where the pid_t sits).
1649                  */
1650                 if (memcmp(filename, "nel.kallsyms]", 13) == 0) {
1651                         if (lseek(input, orig_offset, SEEK_SET) == (off_t)-1)
1652                                 return -1;
1653                         return perf_header__read_build_ids_abi_quirk(header, input, offset, size);
1654                 }
1655 
1656                 __event_process_build_id(&bev, filename, session);
1657 
1658                 offset += bev.header.size;
1659         }
1660         err = 0;
1661 out:
1662         return err;
1663 }
1664 
1665 /* Macro for features that simply need to read and store a string. */
1666 #define FEAT_PROCESS_STR_FUN(__feat, __feat_env) \
1667 static int process_##__feat(struct feat_fd *ff, void *data __maybe_unused) \
1668 {\
1669         ff->ph->env.__feat_env = do_read_string(ff); \
1670         return ff->ph->env.__feat_env ? 0 : -ENOMEM; \
1671 }
1672 
1673 FEAT_PROCESS_STR_FUN(hostname, hostname);
1674 FEAT_PROCESS_STR_FUN(osrelease, os_release);
1675 FEAT_PROCESS_STR_FUN(version, version);
1676 FEAT_PROCESS_STR_FUN(arch, arch);
1677 FEAT_PROCESS_STR_FUN(cpudesc, cpu_desc);
1678 FEAT_PROCESS_STR_FUN(cpuid, cpuid);
1679 
1680 static int process_tracing_data(struct feat_fd *ff, void *data)
1681 {
1682         ssize_t ret = trace_report(ff->fd, data, false);
1683 
1684         return ret < 0 ? -1 : 0;
1685 }
1686 
1687 static int process_build_id(struct feat_fd *ff, void *data __maybe_unused)
1688 {
1689         if (perf_header__read_build_ids(ff->ph, ff->fd, ff->offset, ff->size))
1690                 pr_debug("Failed to read buildids, continuing...\n");
1691         return 0;
1692 }
1693 
1694 static int process_nrcpus(struct feat_fd *ff, void *data __maybe_unused)
1695 {
1696         int ret;
1697         u32 nr_cpus_avail, nr_cpus_online;
1698 
1699         ret = do_read_u32(ff, &nr_cpus_avail);
1700         if (ret)
1701                 return ret;
1702 
1703         ret = do_read_u32(ff, &nr_cpus_online);
1704         if (ret)
1705                 return ret;
1706         ff->ph->env.nr_cpus_avail = (int)nr_cpus_avail;
1707         ff->ph->env.nr_cpus_online = (int)nr_cpus_online;
1708         return 0;
1709 }
1710 
1711 static int process_total_mem(struct feat_fd *ff, void *data __maybe_unused)
1712 {
1713         u64 total_mem;
1714         int ret;
1715 
1716         ret = do_read_u64(ff, &total_mem);
1717         if (ret)
1718                 return -1;
1719         ff->ph->env.total_mem = (unsigned long long)total_mem;
1720         return 0;
1721 }
1722 
1723 static struct perf_evsel *
1724 perf_evlist__find_by_index(struct perf_evlist *evlist, int idx)
1725 {
1726         struct perf_evsel *evsel;
1727 
1728         evlist__for_each_entry(evlist, evsel) {
1729                 if (evsel->idx == idx)
1730                         return evsel;
1731         }
1732 
1733         return NULL;
1734 }
1735 
1736 static void
1737 perf_evlist__set_event_name(struct perf_evlist *evlist,
1738                             struct perf_evsel *event)
1739 {
1740         struct perf_evsel *evsel;
1741 
1742         if (!event->name)
1743                 return;
1744 
1745         evsel = perf_evlist__find_by_index(evlist, event->idx);
1746         if (!evsel)
1747                 return;
1748 
1749         if (evsel->name)
1750                 return;
1751 
1752         evsel->name = strdup(event->name);
1753 }
1754 
1755 static int
1756 process_event_desc(struct feat_fd *ff, void *data __maybe_unused)
1757 {
1758         struct perf_session *session;
1759         struct perf_evsel *evsel, *events = read_event_desc(ff);
1760 
1761         if (!events)
1762                 return 0;
1763 
1764         session = container_of(ff->ph, struct perf_session, header);
1765 
1766         if (session->data->is_pipe) {
1767                 /* Save events for reading later by print_event_desc,
1768                  * since they can't be read again in pipe mode. */
1769                 ff->events = events;
1770         }
1771 
1772         for (evsel = events; evsel->attr.size; evsel++)
1773                 perf_evlist__set_event_name(session->evlist, evsel);
1774 
1775         if (!session->data->is_pipe)
1776                 free_event_desc(events);
1777 
1778         return 0;
1779 }
1780 
1781 static int process_cmdline(struct feat_fd *ff, void *data __maybe_unused)
1782 {
1783         char *str, *cmdline = NULL, **argv = NULL;
1784         u32 nr, i, len = 0;
1785 
1786         if (do_read_u32(ff, &nr))
1787                 return -1;
1788 
1789         ff->ph->env.nr_cmdline = nr;
1790 
1791         cmdline = zalloc(ff->size + nr + 1);
1792         if (!cmdline)
1793                 return -1;
1794 
1795         argv = zalloc(sizeof(char *) * (nr + 1));
1796         if (!argv)
1797                 goto error;
1798 
1799         for (i = 0; i < nr; i++) {
1800                 str = do_read_string(ff);
1801                 if (!str)
1802                         goto error;
1803 
1804                 argv[i] = cmdline + len;
1805                 memcpy(argv[i], str, strlen(str) + 1);
1806                 len += strlen(str) + 1;
1807                 free(str);
1808         }
1809         ff->ph->env.cmdline = cmdline;
1810         ff->ph->env.cmdline_argv = (const char **) argv;
1811         return 0;
1812 
1813 error:
1814         free(argv);
1815         free(cmdline);
1816         return -1;
1817 }
1818 
1819 static int process_cpu_topology(struct feat_fd *ff, void *data __maybe_unused)
1820 {
1821         u32 nr, i;
1822         char *str;
1823         struct strbuf sb;
1824         int cpu_nr = ff->ph->env.nr_cpus_avail;
1825         u64 size = 0;
1826         struct perf_header *ph = ff->ph;
1827 
1828         ph->env.cpu = calloc(cpu_nr, sizeof(*ph->env.cpu));
1829         if (!ph->env.cpu)
1830                 return -1;
1831 
1832         if (do_read_u32(ff, &nr))
1833                 goto free_cpu;
1834 
1835         ph->env.nr_sibling_cores = nr;
1836         size += sizeof(u32);
1837         if (strbuf_init(&sb, 128) < 0)
1838                 goto free_cpu;
1839 
1840         for (i = 0; i < nr; i++) {
1841                 str = do_read_string(ff);
1842                 if (!str)
1843                         goto error;
1844 
1845                 /* include a NULL character at the end */
1846                 if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
1847                         goto error;
1848                 size += string_size(str);
1849                 free(str);
1850         }
1851         ph->env.sibling_cores = strbuf_detach(&sb, NULL);
1852 
1853         if (do_read_u32(ff, &nr))
1854                 return -1;
1855 
1856         ph->env.nr_sibling_threads = nr;
1857         size += sizeof(u32);
1858 
1859         for (i = 0; i < nr; i++) {
1860                 str = do_read_string(ff);
1861                 if (!str)
1862                         goto error;
1863 
1864                 /* include a NULL character at the end */
1865                 if (strbuf_add(&sb, str, strlen(str) + 1) < 0)
1866                         goto error;
1867                 size += string_size(str);
1868                 free(str);
1869         }
1870         ph->env.sibling_threads = strbuf_detach(&sb, NULL);
1871 
1872         /*
1873          * The header may be from old perf,
1874          * which doesn't include core id and socket id information.
1875          */
1876         if (ff->size <= size) {
1877                 zfree(&ph->env.cpu);
1878                 return 0;
1879         }
1880 
1881         for (i = 0; i < (u32)cpu_nr; i++) {
1882                 if (do_read_u32(ff, &nr))
1883                         goto free_cpu;
1884 
1885                 ph->env.cpu[i].core_id = nr;
1886 
1887                 if (do_read_u32(ff, &nr))
1888                         goto free_cpu;
1889 
1890                 if (nr != (u32)-1 && nr > (u32)cpu_nr) {
1891                         pr_debug("socket_id number is too big."
1892                                  "You may need to upgrade the perf tool.\n");
1893                         goto free_cpu;
1894                 }
1895 
1896                 ph->env.cpu[i].socket_id = nr;
1897         }
1898 
1899         return 0;
1900 
1901 error:
1902         strbuf_release(&sb);
1903 free_cpu:
1904         zfree(&ph->env.cpu);
1905         return -1;
1906 }
1907 
1908 static int process_numa_topology(struct feat_fd *ff, void *data __maybe_unused)
1909 {
1910         struct numa_node *nodes, *n;
1911         u32 nr, i;
1912         char *str;
1913 
1914         /* nr nodes */
1915         if (do_read_u32(ff, &nr))
1916                 return -1;
1917 
1918         nodes = zalloc(sizeof(*nodes) * nr);
1919         if (!nodes)
1920                 return -ENOMEM;
1921 
1922         for (i = 0; i < nr; i++) {
1923                 n = &nodes[i];
1924 
1925                 /* node number */
1926                 if (do_read_u32(ff, &n->node))
1927                         goto error;
1928 
1929                 if (do_read_u64(ff, &n->mem_total))
1930                         goto error;
1931 
1932                 if (do_read_u64(ff, &n->mem_free))
1933                         goto error;
1934 
1935                 str = do_read_string(ff);
1936                 if (!str)
1937                         goto error;
1938 
1939                 n->map = cpu_map__new(str);
1940                 if (!n->map)
1941                         goto error;
1942 
1943                 free(str);
1944         }
1945         ff->ph->env.nr_numa_nodes = nr;
1946         ff->ph->env.numa_nodes = nodes;
1947         return 0;
1948 
1949 error:
1950         free(nodes);
1951         return -1;
1952 }
1953 
1954 static int process_pmu_mappings(struct feat_fd *ff, void *data __maybe_unused)
1955 {
1956         char *name;
1957         u32 pmu_num;
1958         u32 type;
1959         struct strbuf sb;
1960 
1961         if (do_read_u32(ff, &pmu_num))
1962                 return -1;
1963 
1964         if (!pmu_num) {
1965                 pr_debug("pmu mappings not available\n");
1966                 return 0;
1967         }
1968 
1969         ff->ph->env.nr_pmu_mappings = pmu_num;
1970         if (strbuf_init(&sb, 128) < 0)
1971                 return -1;
1972 
1973         while (pmu_num) {
1974                 if (do_read_u32(ff, &type))
1975                         goto error;
1976 
1977                 name = do_read_string(ff);
1978                 if (!name)
1979                         goto error;
1980 
1981                 if (strbuf_addf(&sb, "%u:%s", type, name) < 0)
1982                         goto error;
1983                 /* include a NULL character at the end */
1984                 if (strbuf_add(&sb, "", 1) < 0)
1985                         goto error;
1986 
1987                 if (!strcmp(name, "msr"))
1988                         ff->ph->env.msr_pmu_type = type;
1989 
1990                 free(name);
1991                 pmu_num--;
1992         }
1993         ff->ph->env.pmu_mappings = strbuf_detach(&sb, NULL);
1994         return 0;
1995 
1996 error:
1997         strbuf_release(&sb);
1998         return -1;
1999 }
2000 
2001 static int process_group_desc(struct feat_fd *ff, void *data __maybe_unused)
2002 {
2003         size_t ret = -1;
2004         u32 i, nr, nr_groups;
2005         struct perf_session *session;
2006         struct perf_evsel *evsel, *leader = NULL;
2007         struct group_desc {
2008                 char *name;
2009                 u32 leader_idx;
2010                 u32 nr_members;
2011         } *desc;
2012 
2013         if (do_read_u32(ff, &nr_groups))
2014                 return -1;
2015 
2016         ff->ph->env.nr_groups = nr_groups;
2017         if (!nr_groups) {
2018                 pr_debug("group desc not available\n");
2019                 return 0;
2020         }
2021 
2022         desc = calloc(nr_groups, sizeof(*desc));
2023         if (!desc)
2024                 return -1;
2025 
2026         for (i = 0; i < nr_groups; i++) {
2027                 desc[i].name = do_read_string(ff);
2028                 if (!desc[i].name)
2029                         goto out_free;
2030 
2031                 if (do_read_u32(ff, &desc[i].leader_idx))
2032                         goto out_free;
2033 
2034                 if (do_read_u32(ff, &desc[i].nr_members))
2035                         goto out_free;
2036         }
2037 
2038         /*
2039          * Rebuild group relationship based on the group_desc
2040          */
2041         session = container_of(ff->ph, struct perf_session, header);
2042         session->evlist->nr_groups = nr_groups;
2043 
2044         i = nr = 0;
2045         evlist__for_each_entry(session->evlist, evsel) {
2046                 if (evsel->idx == (int) desc[i].leader_idx) {
2047                         evsel->leader = evsel;
2048                         /* {anon_group} is a dummy name */
2049                         if (strcmp(desc[i].name, "{anon_group}")) {
2050                                 evsel->group_name = desc[i].name;
2051                                 desc[i].name = NULL;
2052                         }
2053                         evsel->nr_members = desc[i].nr_members;
2054 
2055                         if (i >= nr_groups || nr > 0) {
2056                                 pr_debug("invalid group desc\n");
2057                                 goto out_free;
2058                         }
2059 
2060                         leader = evsel;
2061                         nr = evsel->nr_members - 1;
2062                         i++;
2063                 } else if (nr) {
2064                         /* This is a group member */
2065                         evsel->leader = leader;
2066 
2067                         nr--;
2068                 }
2069         }
2070 
2071         if (i != nr_groups || nr != 0) {
2072                 pr_debug("invalid group desc\n");
2073                 goto out_free;
2074         }
2075 
2076         ret = 0;
2077 out_free:
2078         for (i = 0; i < nr_groups; i++)
2079                 zfree(&desc[i].name);
2080         free(desc);
2081 
2082         return ret;
2083 }
2084 
2085 static int process_auxtrace(struct feat_fd *ff, void *data __maybe_unused)
2086 {
2087         struct perf_session *session;
2088         int err;
2089 
2090         session = container_of(ff->ph, struct perf_session, header);
2091 
2092         err = auxtrace_index__process(ff->fd, ff->size, session,
2093                                       ff->ph->needs_swap);
2094         if (err < 0)
2095                 pr_err("Failed to process auxtrace index\n");
2096         return err;
2097 }
2098 
2099 static int process_cache(struct feat_fd *ff, void *data __maybe_unused)
2100 {
2101         struct cpu_cache_level *caches;
2102         u32 cnt, i, version;
2103 
2104         if (do_read_u32(ff, &version))
2105                 return -1;
2106 
2107         if (version != 1)
2108                 return -1;
2109 
2110         if (do_read_u32(ff, &cnt))
2111                 return -1;
2112 
2113         caches = zalloc(sizeof(*caches) * cnt);
2114         if (!caches)
2115                 return -1;
2116 
2117         for (i = 0; i < cnt; i++) {
2118                 struct cpu_cache_level c;
2119 
2120                 #define _R(v)                                           \
2121                         if (do_read_u32(ff, &c.v))\
2122                                 goto out_free_caches;                   \
2123 
2124                 _R(level)
2125                 _R(line_size)
2126                 _R(sets)
2127                 _R(ways)
2128                 #undef _R
2129 
2130                 #define _R(v)                                   \
2131                         c.v = do_read_string(ff);               \
2132                         if (!c.v)                               \
2133                                 goto out_free_caches;
2134 
2135                 _R(type)
2136                 _R(size)
2137                 _R(map)
2138                 #undef _R
2139 
2140                 caches[i] = c;
2141         }
2142 
2143         ff->ph->env.caches = caches;
2144         ff->ph->env.caches_cnt = cnt;
2145         return 0;
2146 out_free_caches:
2147         free(caches);
2148         return -1;
2149 }
2150 
2151 struct feature_ops {
2152         int (*write)(struct feat_fd *ff, struct perf_evlist *evlist);
2153         void (*print)(struct feat_fd *ff, FILE *fp);
2154         int (*process)(struct feat_fd *ff, void *data);
2155         const char *name;
2156         bool full_only;
2157         bool synthesize;
2158 };
2159 
2160 #define FEAT_OPR(n, func, __full_only) \
2161         [HEADER_##n] = {                                        \
2162                 .name       = __stringify(n),                   \
2163                 .write      = write_##func,                     \
2164                 .print      = print_##func,                     \
2165                 .full_only  = __full_only,                      \
2166                 .process    = process_##func,                   \
2167                 .synthesize = true                              \
2168         }
2169 
2170 #define FEAT_OPN(n, func, __full_only) \
2171         [HEADER_##n] = {                                        \
2172                 .name       = __stringify(n),                   \
2173                 .write      = write_##func,                     \
2174                 .print      = print_##func,                     \
2175                 .full_only  = __full_only,                      \
2176                 .process    = process_##func                    \
2177         }
2178 
2179 /* feature_ops not implemented: */
2180 #define print_tracing_data      NULL
2181 #define print_build_id          NULL
2182 
2183 #define process_branch_stack    NULL
2184 #define process_stat            NULL
2185 
2186 
2187 static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
2188         FEAT_OPN(TRACING_DATA,  tracing_data,   false),
2189         FEAT_OPN(BUILD_ID,      build_id,       false),
2190         FEAT_OPR(HOSTNAME,      hostname,       false),
2191         FEAT_OPR(OSRELEASE,     osrelease,      false),
2192         FEAT_OPR(VERSION,       version,        false),
2193         FEAT_OPR(ARCH,          arch,           false),
2194         FEAT_OPR(NRCPUS,        nrcpus,         false),
2195         FEAT_OPR(CPUDESC,       cpudesc,        false),
2196         FEAT_OPR(CPUID,         cpuid,          false),
2197         FEAT_OPR(TOTAL_MEM,     total_mem,      false),
2198         FEAT_OPR(EVENT_DESC,    event_desc,     false),
2199         FEAT_OPR(CMDLINE,       cmdline,        false),
2200         FEAT_OPR(CPU_TOPOLOGY,  cpu_topology,   true),
2201         FEAT_OPR(NUMA_TOPOLOGY, numa_topology,  true),
2202         FEAT_OPN(BRANCH_STACK,  branch_stack,   false),
2203         FEAT_OPR(PMU_MAPPINGS,  pmu_mappings,   false),
2204         FEAT_OPN(GROUP_DESC,    group_desc,     false),
2205         FEAT_OPN(AUXTRACE,      auxtrace,       false),
2206         FEAT_OPN(STAT,          stat,           false),
2207         FEAT_OPN(CACHE,         cache,          true),
2208 };
2209 
2210 struct header_print_data {
2211         FILE *fp;
2212         bool full; /* extended list of headers */
2213 };
2214 
2215 static int perf_file_section__fprintf_info(struct perf_file_section *section,
2216                                            struct perf_header *ph,
2217                                            int feat, int fd, void *data)
2218 {
2219         struct header_print_data *hd = data;
2220         struct feat_fd ff;
2221 
2222         if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
2223                 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
2224                                 "%d, continuing...\n", section->offset, feat);
2225                 return 0;
2226         }
2227         if (feat >= HEADER_LAST_FEATURE) {
2228                 pr_warning("unknown feature %d\n", feat);
2229                 return 0;
2230         }
2231         if (!feat_ops[feat].print)
2232                 return 0;
2233 
2234         ff = (struct  feat_fd) {
2235                 .fd = fd,
2236                 .ph = ph,
2237         };
2238 
2239         if (!feat_ops[feat].full_only || hd->full)
2240                 feat_ops[feat].print(&ff, hd->fp);
2241         else
2242                 fprintf(hd->fp, "# %s info available, use -I to display\n",
2243                         feat_ops[feat].name);
2244 
2245         return 0;
2246 }
2247 
2248 int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
2249 {
2250         struct header_print_data hd;
2251         struct perf_header *header = &session->header;
2252         int fd = perf_data__fd(session->data);
2253         struct stat st;
2254         int ret, bit;
2255 
2256         hd.fp = fp;
2257         hd.full = full;
2258 
2259         ret = fstat(fd, &st);
2260         if (ret == -1)
2261                 return -1;
2262 
2263         fprintf(fp, "# captured on: %s", ctime(&st.st_ctime));
2264 
2265         perf_header__process_sections(header, fd, &hd,
2266                                       perf_file_section__fprintf_info);
2267 
2268         if (session->data->is_pipe)
2269                 return 0;
2270 
2271         fprintf(fp, "# missing features: ");
2272         for_each_clear_bit(bit, header->adds_features, HEADER_LAST_FEATURE) {
2273                 if (bit)
2274                         fprintf(fp, "%s ", feat_ops[bit].name);
2275         }
2276 
2277         fprintf(fp, "\n");
2278         return 0;
2279 }
2280 
2281 static int do_write_feat(struct feat_fd *ff, int type,
2282                          struct perf_file_section **p,
2283                          struct perf_evlist *evlist)
2284 {
2285         int err;
2286         int ret = 0;
2287 
2288         if (perf_header__has_feat(ff->ph, type)) {
2289                 if (!feat_ops[type].write)
2290                         return -1;
2291 
2292                 if (WARN(ff->buf, "Error: calling %s in pipe-mode.\n", __func__))
2293                         return -1;
2294 
2295                 (*p)->offset = lseek(ff->fd, 0, SEEK_CUR);
2296 
2297                 err = feat_ops[type].write(ff, evlist);
2298                 if (err < 0) {
2299                         pr_debug("failed to write feature %s\n", feat_ops[type].name);
2300 
2301                         /* undo anything written */
2302                         lseek(ff->fd, (*p)->offset, SEEK_SET);
2303 
2304                         return -1;
2305                 }
2306                 (*p)->size = lseek(ff->fd, 0, SEEK_CUR) - (*p)->offset;
2307                 (*p)++;
2308         }
2309         return ret;
2310 }
2311 
2312 static int perf_header__adds_write(struct perf_header *header,
2313                                    struct perf_evlist *evlist, int fd)
2314 {
2315         int nr_sections;
2316         struct feat_fd ff;
2317         struct perf_file_section *feat_sec, *p;
2318         int sec_size;
2319         u64 sec_start;
2320         int feat;
2321         int err;
2322 
2323         ff = (struct feat_fd){
2324                 .fd  = fd,
2325                 .ph = header,
2326         };
2327 
2328         nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
2329         if (!nr_sections)
2330                 return 0;
2331 
2332         feat_sec = p = calloc(nr_sections, sizeof(*feat_sec));
2333         if (feat_sec == NULL)
2334                 return -ENOMEM;
2335 
2336         sec_size = sizeof(*feat_sec) * nr_sections;
2337 
2338         sec_start = header->feat_offset;
2339         lseek(fd, sec_start + sec_size, SEEK_SET);
2340 
2341         for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
2342                 if (do_write_feat(&ff, feat, &p, evlist))
2343                         perf_header__clear_feat(header, feat);
2344         }
2345 
2346         lseek(fd, sec_start, SEEK_SET);
2347         /*
2348          * may write more than needed due to dropped feature, but
2349          * this is okay, reader will skip the mising entries
2350          */
2351         err = do_write(&ff, feat_sec, sec_size);
2352         if (err < 0)
2353                 pr_debug("failed to write feature section\n");
2354         free(feat_sec);
2355         return err;
2356 }
2357 
2358 int perf_header__write_pipe(int fd)
2359 {
2360         struct perf_pipe_file_header f_header;
2361         struct feat_fd ff;
2362         int err;
2363 
2364         ff = (struct feat_fd){ .fd = fd };
2365 
2366         f_header = (struct perf_pipe_file_header){
2367                 .magic     = PERF_MAGIC,
2368                 .size      = sizeof(f_header),
2369         };
2370 
2371         err = do_write(&ff, &f_header, sizeof(f_header));
2372         if (err < 0) {
2373                 pr_debug("failed to write perf pipe header\n");
2374                 return err;
2375         }
2376 
2377         return 0;
2378 }
2379 
2380 int perf_session__write_header(struct perf_session *session,
2381                                struct perf_evlist *evlist,
2382                                int fd, bool at_exit)
2383 {
2384         struct perf_file_header f_header;
2385         struct perf_file_attr   f_attr;
2386         struct perf_header *header = &session->header;
2387         struct perf_evsel *evsel;
2388         struct feat_fd ff;
2389         u64 attr_offset;
2390         int err;
2391 
2392         ff = (struct feat_fd){ .fd = fd};
2393         lseek(fd, sizeof(f_header), SEEK_SET);
2394 
2395         evlist__for_each_entry(session->evlist, evsel) {
2396                 evsel->id_offset = lseek(fd, 0, SEEK_CUR);
2397                 err = do_write(&ff, evsel->id, evsel->ids * sizeof(u64));
2398                 if (err < 0) {
2399                         pr_debug("failed to write perf header\n");
2400                         return err;
2401                 }
2402         }
2403 
2404         attr_offset = lseek(ff.fd, 0, SEEK_CUR);
2405 
2406         evlist__for_each_entry(evlist, evsel) {
2407                 f_attr = (struct perf_file_attr){
2408                         .attr = evsel->attr,
2409                         .ids  = {
2410                                 .offset = evsel->id_offset,
2411                                 .size   = evsel->ids * sizeof(u64),
2412                         }
2413                 };
2414                 err = do_write(&ff, &f_attr, sizeof(f_attr));
2415                 if (err < 0) {
2416                         pr_debug("failed to write perf header attribute\n");
2417                         return err;
2418                 }
2419         }
2420 
2421         if (!header->data_offset)
2422                 header->data_offset = lseek(fd, 0, SEEK_CUR);
2423         header->feat_offset = header->data_offset + header->data_size;
2424 
2425         if (at_exit) {
2426                 err = perf_header__adds_write(header, evlist, fd);
2427                 if (err < 0)
2428                         return err;
2429         }
2430 
2431         f_header = (struct perf_file_header){
2432                 .magic     = PERF_MAGIC,
2433                 .size      = sizeof(f_header),
2434                 .attr_size = sizeof(f_attr),
2435                 .attrs = {
2436                         .offset = attr_offset,
2437                         .size   = evlist->nr_entries * sizeof(f_attr),
2438                 },
2439                 .data = {
2440                         .offset = header->data_offset,
2441                         .size   = header->data_size,
2442                 },
2443                 /* event_types is ignored, store zeros */
2444         };
2445 
2446         memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));
2447 
2448         lseek(fd, 0, SEEK_SET);
2449         err = do_write(&ff, &f_header, sizeof(f_header));
2450         if (err < 0) {
2451                 pr_debug("failed to write perf header\n");
2452                 return err;
2453         }
2454         lseek(fd, header->data_offset + header->data_size, SEEK_SET);
2455 
2456         return 0;
2457 }
2458 
2459 static int perf_header__getbuffer64(struct perf_header *header,
2460                                     int fd, void *buf, size_t size)
2461 {
2462         if (readn(fd, buf, size) <= 0)
2463                 return -1;
2464 
2465         if (header->needs_swap)
2466                 mem_bswap_64(buf, size);
2467 
2468         return 0;
2469 }
2470 
2471 int perf_header__process_sections(struct perf_header *header, int fd,
2472                                   void *data,
2473                                   int (*process)(struct perf_file_section *section,
2474                                                  struct perf_header *ph,
2475                                                  int feat, int fd, void *data))
2476 {
2477         struct perf_file_section *feat_sec, *sec;
2478         int nr_sections;
2479         int sec_size;
2480         int feat;
2481         int err;
2482 
2483         nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
2484         if (!nr_sections)
2485                 return 0;
2486 
2487         feat_sec = sec = calloc(nr_sections, sizeof(*feat_sec));
2488         if (!feat_sec)
2489                 return -1;
2490 
2491         sec_size = sizeof(*feat_sec) * nr_sections;
2492 
2493         lseek(fd, header->feat_offset, SEEK_SET);
2494 
2495         err = perf_header__getbuffer64(header, fd, feat_sec, sec_size);
2496         if (err < 0)
2497                 goto out_free;
2498 
2499         for_each_set_bit(feat, header->adds_features, HEADER_LAST_FEATURE) {
2500                 err = process(sec++, header, feat, fd, data);
2501                 if (err < 0)
2502                         goto out_free;
2503         }
2504         err = 0;
2505 out_free:
2506         free(feat_sec);
2507         return err;
2508 }
2509 
2510 static const int attr_file_abi_sizes[] = {
2511         [0] = PERF_ATTR_SIZE_VER0,
2512         [1] = PERF_ATTR_SIZE_VER1,
2513         [2] = PERF_ATTR_SIZE_VER2,
2514         [3] = PERF_ATTR_SIZE_VER3,
2515         [4] = PERF_ATTR_SIZE_VER4,
2516         0,
2517 };
2518 
2519 /*
2520  * In the legacy file format, the magic number is not used to encode endianness.
2521  * hdr_sz was used to encode endianness. But given that hdr_sz can vary based
2522  * on ABI revisions, we need to try all combinations for all endianness to
2523  * detect the endianness.
2524  */
2525 static int try_all_file_abis(uint64_t hdr_sz, struct perf_header *ph)
2526 {
2527         uint64_t ref_size, attr_size;
2528         int i;
2529 
2530         for (i = 0 ; attr_file_abi_sizes[i]; i++) {
2531                 ref_size = attr_file_abi_sizes[i]
2532                          + sizeof(struct perf_file_section);
2533                 if (hdr_sz != ref_size) {
2534                         attr_size = bswap_64(hdr_sz);
2535                         if (attr_size != ref_size)
2536                                 continue;
2537 
2538                         ph->needs_swap = true;
2539                 }
2540                 pr_debug("ABI%d perf.data file detected, need_swap=%d\n",
2541                          i,
2542                          ph->needs_swap);
2543                 return 0;
2544         }
2545         /* could not determine endianness */
2546         return -1;
2547 }
2548 
2549 #define PERF_PIPE_HDR_VER0      16
2550 
2551 static const size_t attr_pipe_abi_sizes[] = {
2552         [0] = PERF_PIPE_HDR_VER0,
2553         0,
2554 };
2555 
2556 /*
2557  * In the legacy pipe format, there is an implicit assumption that endiannesss
2558  * between host recording the samples, and host parsing the samples is the
2559  * same. This is not always the case given that the pipe output may always be
2560  * redirected into a file and analyzed on a different machine with possibly a
2561  * different endianness and perf_event ABI revsions in the perf tool itself.
2562  */
2563 static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph)
2564 {
2565         u64 attr_size;
2566         int i;
2567 
2568         for (i = 0 ; attr_pipe_abi_sizes[i]; i++) {
2569                 if (hdr_sz != attr_pipe_abi_sizes[i]) {
2570                         attr_size = bswap_64(hdr_sz);
2571                         if (attr_size != hdr_sz)
2572                                 continue;
2573 
2574                         ph->needs_swap = true;
2575                 }
2576                 pr_debug("Pipe ABI%d perf.data file detected\n", i);
2577                 return 0;
2578         }
2579         return -1;
2580 }
2581 
2582 bool is_perf_magic(u64 magic)
2583 {
2584         if (!memcmp(&magic, __perf_magic1, sizeof(magic))
2585                 || magic == __perf_magic2
2586                 || magic == __perf_magic2_sw)
2587                 return true;
2588 
2589         return false;
2590 }
2591 
2592 static int check_magic_endian(u64 magic, uint64_t hdr_sz,
2593                               bool is_pipe, struct perf_header *ph)
2594 {
2595         int ret;
2596 
2597         /* check for legacy format */
2598         ret = memcmp(&magic, __perf_magic1, sizeof(magic));
2599         if (ret == 0) {
2600                 ph->version = PERF_HEADER_VERSION_1;
2601                 pr_debug("legacy perf.data format\n");
2602                 if (is_pipe)
2603                         return try_all_pipe_abis(hdr_sz, ph);
2604 
2605                 return try_all_file_abis(hdr_sz, ph);
2606         }
2607         /*
2608          * the new magic number serves two purposes:
2609          * - unique number to identify actual perf.data files
2610          * - encode endianness of file
2611          */
2612         ph->version = PERF_HEADER_VERSION_2;
2613 
2614         /* check magic number with one endianness */
2615         if (magic == __perf_magic2)
2616                 return 0;
2617 
2618         /* check magic number with opposite endianness */
2619         if (magic != __perf_magic2_sw)
2620                 return -1;
2621 
2622         ph->needs_swap = true;
2623 
2624         return 0;
2625 }
2626 
2627 int perf_file_header__read(struct perf_file_header *header,
2628                            struct perf_header *ph, int fd)
2629 {
2630         ssize_t ret;
2631 
2632         lseek(fd, 0, SEEK_SET);
2633 
2634         ret = readn(fd, header, sizeof(*header));
2635         if (ret <= 0)
2636                 return -1;
2637 
2638         if (check_magic_endian(header->magic,
2639                                header->attr_size, false, ph) < 0) {
2640                 pr_debug("magic/endian check failed\n");
2641                 return -1;
2642         }
2643 
2644         if (ph->needs_swap) {
2645                 mem_bswap_64(header, offsetof(struct perf_file_header,
2646                              adds_features));
2647         }
2648 
2649         if (header->size != sizeof(*header)) {
2650                 /* Support the previous format */
2651                 if (header->size == offsetof(typeof(*header), adds_features))
2652                         bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
2653                 else
2654                         return -1;
2655         } else if (ph->needs_swap) {
2656                 /*
2657                  * feature bitmap is declared as an array of unsigned longs --
2658                  * not good since its size can differ between the host that
2659                  * generated the data file and the host analyzing the file.
2660                  *
2661                  * We need to handle endianness, but we don't know the size of
2662                  * the unsigned long where the file was generated. Take a best
2663                  * guess at determining it: try 64-bit swap first (ie., file
2664                  * created on a 64-bit host), and check if the hostname feature
2665                  * bit is set (this feature bit is forced on as of fbe96f2).
2666                  * If the bit is not, undo the 64-bit swap and try a 32-bit
2667                  * swap. If the hostname bit is still not set (e.g., older data
2668                  * file), punt and fallback to the original behavior --
2669                  * clearing all feature bits and setting buildid.
2670                  */
2671                 mem_bswap_64(&header->adds_features,
2672                             BITS_TO_U64(HEADER_FEAT_BITS));
2673 
2674                 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
2675                         /* unswap as u64 */
2676                         mem_bswap_64(&header->adds_features,
2677                                     BITS_TO_U64(HEADER_FEAT_BITS));
2678 
2679                         /* unswap as u32 */
2680                         mem_bswap_32(&header->adds_features,
2681                                     BITS_TO_U32(HEADER_FEAT_BITS));
2682                 }
2683 
2684                 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
2685                         bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
2686                         set_bit(HEADER_BUILD_ID, header->adds_features);
2687                 }
2688         }
2689 
2690         memcpy(&ph->adds_features, &header->adds_features,
2691                sizeof(ph->adds_features));
2692 
2693         ph->data_offset  = header->data.offset;
2694         ph->data_size    = header->data.size;
2695         ph->feat_offset  = header->data.offset + header->data.size;
2696         return 0;
2697 }
2698 
2699 static int perf_file_section__process(struct perf_file_section *section,
2700                                       struct perf_header *ph,
2701                                       int feat, int fd, void *data)
2702 {
2703         struct feat_fd fdd = {
2704                 .fd     = fd,
2705                 .ph     = ph,
2706                 .size   = section->size,
2707                 .offset = section->offset,
2708         };
2709 
2710         if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
2711                 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
2712                           "%d, continuing...\n", section->offset, feat);
2713                 return 0;
2714         }
2715 
2716         if (feat >= HEADER_LAST_FEATURE) {
2717                 pr_debug("unknown feature %d, continuing...\n", feat);
2718                 return 0;
2719         }
2720 
2721         if (!feat_ops[feat].process)
2722                 return 0;
2723 
2724         return feat_ops[feat].process(&fdd, data);
2725 }
2726 
2727 static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
2728                                        struct perf_header *ph, int fd,
2729                                        bool repipe)
2730 {
2731         struct feat_fd ff = {
2732                 .fd = STDOUT_FILENO,
2733                 .ph = ph,
2734         };
2735         ssize_t ret;
2736 
2737         ret = readn(fd, header, sizeof(*header));
2738         if (ret <= 0)
2739                 return -1;
2740 
2741         if (check_magic_endian(header->magic, header->size, true, ph) < 0) {
2742                 pr_debug("endian/magic failed\n");
2743                 return -1;
2744         }
2745 
2746         if (ph->needs_swap)
2747                 header->size = bswap_64(header->size);
2748 
2749         if (repipe && do_write(&ff, header, sizeof(*header)) < 0)
2750                 return -1;
2751 
2752         return 0;
2753 }
2754 
2755 static int perf_header__read_pipe(struct perf_session *session)
2756 {
2757         struct perf_header *header = &session->header;
2758         struct perf_pipe_file_header f_header;
2759 
2760         if (perf_file_header__read_pipe(&f_header, header,
2761                                         perf_data__fd(session->data),
2762                                         session->repipe) < 0) {
2763                 pr_debug("incompatible file format\n");
2764                 return -EINVAL;
2765         }
2766 
2767         return 0;
2768 }
2769 
2770 static int read_attr(int fd, struct perf_header *ph,
2771                      struct perf_file_attr *f_attr)
2772 {
2773         struct perf_event_attr *attr = &f_attr->attr;
2774         size_t sz, left;
2775         size_t our_sz = sizeof(f_attr->attr);
2776         ssize_t ret;
2777 
2778         memset(f_attr, 0, sizeof(*f_attr));
2779 
2780         /* read minimal guaranteed structure */
2781         ret = readn(fd, attr, PERF_ATTR_SIZE_VER0);
2782         if (ret <= 0) {
2783                 pr_debug("cannot read %d bytes of header attr\n",
2784                          PERF_ATTR_SIZE_VER0);
2785                 return -1;
2786         }
2787 
2788         /* on file perf_event_attr size */
2789         sz = attr->size;
2790 
2791         if (ph->needs_swap)
2792                 sz = bswap_32(sz);
2793 
2794         if (sz == 0) {
2795                 /* assume ABI0 */
2796                 sz =  PERF_ATTR_SIZE_VER0;
2797         } else if (sz > our_sz) {
2798                 pr_debug("file uses a more recent and unsupported ABI"
2799                          " (%zu bytes extra)\n", sz - our_sz);
2800                 return -1;
2801         }
2802         /* what we have not yet read and that we know about */
2803         left = sz - PERF_ATTR_SIZE_VER0;
2804         if (left) {
2805                 void *ptr = attr;
2806                 ptr += PERF_ATTR_SIZE_VER0;
2807 
2808                 ret = readn(fd, ptr, left);
2809         }
2810         /* read perf_file_section, ids are read in caller */
2811         ret = readn(fd, &f_attr->ids, sizeof(f_attr->ids));
2812 
2813         return ret <= 0 ? -1 : 0;
2814 }
2815 
2816 static int perf_evsel__prepare_tracepoint_event(struct perf_evsel *evsel,
2817                                                 struct pevent *pevent)
2818 {
2819         struct event_format *event;
2820         char bf[128];
2821 
2822         /* already prepared */
2823         if (evsel->tp_format)
2824                 return 0;
2825 
2826         if (pevent == NULL) {
2827                 pr_debug("broken or missing trace data\n");
2828                 return -1;
2829         }
2830 
2831         event = pevent_find_event(pevent, evsel->attr.config);
2832         if (event == NULL) {
2833                 pr_debug("cannot find event format for %d\n", (int)evsel->attr.config);
2834                 return -1;
2835         }
2836 
2837         if (!evsel->name) {
2838                 snprintf(bf, sizeof(bf), "%s:%s", event->system, event->name);
2839                 evsel->name = strdup(bf);
2840                 if (evsel->name == NULL)
2841                         return -1;
2842         }
2843 
2844         evsel->tp_format = event;
2845         return 0;
2846 }
2847 
2848 static int perf_evlist__prepare_tracepoint_events(struct perf_evlist *evlist,
2849                                                   struct pevent *pevent)
2850 {
2851         struct perf_evsel *pos;
2852 
2853         evlist__for_each_entry(evlist, pos) {
2854                 if (pos->attr.type == PERF_TYPE_TRACEPOINT &&
2855                     perf_evsel__prepare_tracepoint_event(pos, pevent))
2856                         return -1;
2857         }
2858 
2859         return 0;
2860 }
2861 
2862 int perf_session__read_header(struct perf_session *session)
2863 {
2864         struct perf_data *data = session->data;
2865         struct perf_header *header = &session->header;
2866         struct perf_file_header f_header;
2867         struct perf_file_attr   f_attr;
2868         u64                     f_id;
2869         int nr_attrs, nr_ids, i, j;
2870         int fd = perf_data__fd(data);
2871 
2872         session->evlist = perf_evlist__new();
2873         if (session->evlist == NULL)
2874                 return -ENOMEM;
2875 
2876         session->evlist->env = &header->env;
2877         session->machines.host.env = &header->env;
2878         if (perf_data__is_pipe(data))
2879                 return perf_header__read_pipe(session);
2880 
2881         if (perf_file_header__read(&f_header, header, fd) < 0)
2882                 return -EINVAL;
2883 
2884         /*
2885          * Sanity check that perf.data was written cleanly; data size is
2886          * initialized to 0 and updated only if the on_exit function is run.
2887          * If data size is still 0 then the file contains only partial
2888          * information.  Just warn user and process it as much as it can.
2889          */
2890         if (f_header.data.size == 0) {
2891                 pr_warning("WARNING: The %s file's data size field is 0 which is unexpected.\n"
2892                            "Was the 'perf record' command properly terminated?\n",
2893                            data->file.path);
2894         }
2895 
2896         nr_attrs = f_header.attrs.size / f_header.attr_size;
2897         lseek(fd, f_header.attrs.offset, SEEK_SET);
2898 
2899         for (i = 0; i < nr_attrs; i++) {
2900                 struct perf_evsel *evsel;
2901                 off_t tmp;
2902 
2903                 if (read_attr(fd, header, &f_attr) < 0)
2904                         goto out_errno;
2905 
2906                 if (header->needs_swap) {
2907                         f_attr.ids.size   = bswap_64(f_attr.ids.size);
2908                         f_attr.ids.offset = bswap_64(f_attr.ids.offset);
2909                         perf_event__attr_swap(&f_attr.attr);
2910                 }
2911 
2912                 tmp = lseek(fd, 0, SEEK_CUR);
2913                 evsel = perf_evsel__new(&f_attr.attr);
2914 
2915                 if (evsel == NULL)
2916                         goto out_delete_evlist;
2917 
2918                 evsel->needs_swap = header->needs_swap;
2919                 /*
2920                  * Do it before so that if perf_evsel__alloc_id fails, this
2921                  * entry gets purged too at perf_evlist__delete().
2922                  */
2923                 perf_evlist__add(session->evlist, evsel);
2924 
2925                 nr_ids = f_attr.ids.size / sizeof(u64);
2926                 /*
2927                  * We don't have the cpu and thread maps on the header, so
2928                  * for allocating the perf_sample_id table we fake 1 cpu and
2929                  * hattr->ids threads.
2930                  */
2931                 if (perf_evsel__alloc_id(evsel, 1, nr_ids))
2932                         goto out_delete_evlist;
2933 
2934                 lseek(fd, f_attr.ids.offset, SEEK_SET);
2935 
2936                 for (j = 0; j < nr_ids; j++) {
2937                         if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))
2938                                 goto out_errno;
2939 
2940                         perf_evlist__id_add(session->evlist, evsel, 0, j, f_id);
2941                 }
2942 
2943                 lseek(fd, tmp, SEEK_SET);
2944         }
2945 
2946         symbol_conf.nr_events = nr_attrs;
2947 
2948         perf_header__process_sections(header, fd, &session->tevent,
2949                                       perf_file_section__process);
2950 
2951         if (perf_evlist__prepare_tracepoint_events(session->evlist,
2952                                                    session->tevent.pevent))
2953                 goto out_delete_evlist;
2954 
2955         return 0;
2956 out_errno:
2957         return -errno;
2958 
2959 out_delete_evlist:
2960         perf_evlist__delete(session->evlist);
2961         session->evlist = NULL;
2962         return -ENOMEM;
2963 }
2964 
2965 int perf_event__synthesize_attr(struct perf_tool *tool,
2966                                 struct perf_event_attr *attr, u32 ids, u64 *id,
2967                                 perf_event__handler_t process)
2968 {
2969         union perf_event *ev;
2970         size_t size;
2971         int err;
2972 
2973         size = sizeof(struct perf_event_attr);
2974         size = PERF_ALIGN(size, sizeof(u64));
2975         size += sizeof(struct perf_event_header);
2976         size += ids * sizeof(u64);
2977 
2978         ev = malloc(size);
2979 
2980         if (ev == NULL)
2981                 return -ENOMEM;
2982 
2983         ev->attr.attr = *attr;
2984         memcpy(ev->attr.id, id, ids * sizeof(u64));
2985 
2986         ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2987         ev->attr.header.size = (u16)size;
2988 
2989         if (ev->attr.header.size == size)
2990                 err = process(tool, ev, NULL, NULL);
2991         else
2992                 err = -E2BIG;
2993 
2994         free(ev);
2995 
2996         return err;
2997 }
2998 
2999 int perf_event__synthesize_features(struct perf_tool *tool,
3000                                     struct perf_session *session,
3001                                     struct perf_evlist *evlist,
3002                                     perf_event__handler_t process)
3003 {
3004         struct perf_header *header = &session->header;
3005         struct feat_fd ff;
3006         struct feature_event *fe;
3007         size_t sz, sz_hdr;
3008         int feat, ret;
3009 
3010         sz_hdr = sizeof(fe->header);
3011         sz = sizeof(union perf_event);
3012         /* get a nice alignment */
3013         sz = PERF_ALIGN(sz, page_size);
3014 
3015         memset(&ff, 0, sizeof(ff));
3016 
3017         ff.buf = malloc(sz);
3018         if (!ff.buf)
3019                 return -ENOMEM;
3020 
3021         ff.size = sz - sz_hdr;
3022 
3023         for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
3024                 if (!feat_ops[feat].synthesize) {
3025                         pr_debug("No record header feature for header :%d\n", feat);
3026                         continue;
3027                 }
3028 
3029                 ff.offset = sizeof(*fe);
3030 
3031                 ret = feat_ops[feat].write(&ff, evlist);
3032                 if (ret || ff.offset <= (ssize_t)sizeof(*fe)) {
3033                         pr_debug("Error writing feature\n");
3034                         continue;
3035                 }
3036                 /* ff.buf may have changed due to realloc in do_write() */
3037                 fe = ff.buf;
3038                 memset(fe, 0, sizeof(*fe));
3039 
3040                 fe->feat_id = feat;
3041                 fe->header.type = PERF_RECORD_HEADER_FEATURE;
3042                 fe->header.size = ff.offset;
3043 
3044                 ret = process(tool, ff.buf, NULL, NULL);
3045                 if (ret) {
3046                         free(ff.buf);
3047                         return ret;
3048                 }
3049         }
3050         free(ff.buf);
3051         return 0;
3052 }
3053 
3054 int perf_event__process_feature(struct perf_tool *tool,
3055                                 union perf_event *event,
3056                                 struct perf_session *session __maybe_unused)
3057 {
3058         struct feat_fd ff = { .fd = 0 };
3059         struct feature_event *fe = (struct feature_event *)event;
3060         int type = fe->header.type;
3061         u64 feat = fe->feat_id;
3062 
3063         if (type < 0 || type >= PERF_RECORD_HEADER_MAX) {
3064                 pr_warning("invalid record type %d in pipe-mode\n", type);
3065                 return 0;
3066         }
3067         if (feat == HEADER_RESERVED || feat > HEADER_LAST_FEATURE) {
3068                 pr_warning("invalid record type %d in pipe-mode\n", type);
3069                 return -1;
3070         }
3071 
3072         if (!feat_ops[feat].process)
3073                 return 0;
3074 
3075         ff.buf  = (void *)fe->data;
3076         ff.size = event->header.size - sizeof(event->header);
3077         ff.ph = &session->header;
3078 
3079         if (feat_ops[feat].process(&ff, NULL))
3080                 return -1;
3081 
3082         if (!feat_ops[feat].print || !tool->show_feat_hdr)
3083                 return 0;
3084 
3085         if (!feat_ops[feat].full_only ||
3086             tool->show_feat_hdr >= SHOW_FEAT_HEADER_FULL_INFO) {
3087                 feat_ops[feat].print(&ff, stdout);
3088         } else {
3089                 fprintf(stdout, "# %s info available, use -I to display\n",
3090                         feat_ops[feat].name);
3091         }
3092 
3093         return 0;
3094 }
3095 
3096 static struct event_update_event *
3097 event_update_event__new(size_t size, u64 type, u64 id)
3098 {
3099         struct event_update_event *ev;
3100 
3101         size += sizeof(*ev);
3102         size  = PERF_ALIGN(size, sizeof(u64));
3103 
3104         ev = zalloc(size);
3105         if (ev) {
3106                 ev->header.type = PERF_RECORD_EVENT_UPDATE;
3107                 ev->header.size = (u16)size;
3108                 ev->type = type;
3109                 ev->id = id;
3110         }
3111         return ev;
3112 }
3113 
3114 int
3115 perf_event__synthesize_event_update_unit(struct perf_tool *tool,
3116                                          struct perf_evsel *evsel,
3117                                          perf_event__handler_t process)
3118 {
3119         struct event_update_event *ev;
3120         size_t size = strlen(evsel->unit);
3121         int err;
3122 
3123         ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->id[0]);
3124         if (ev == NULL)
3125                 return -ENOMEM;
3126 
3127         strncpy(ev->data, evsel->unit, size);
3128         err = process(tool, (union perf_event *)ev, NULL, NULL);
3129         free(ev);
3130         return err;
3131 }
3132 
3133 int
3134 perf_event__synthesize_event_update_scale(struct perf_tool *tool,
3135                                           struct perf_evsel *evsel,
3136                                           perf_event__handler_t process)
3137 {
3138         struct event_update_event *ev;
3139         struct event_update_event_scale *ev_data;
3140         int err;
3141 
3142         ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->id[0]);
3143         if (ev == NULL)
3144                 return -ENOMEM;
3145 
3146         ev_data = (struct event_update_event_scale *) ev->data;
3147         ev_data->scale = evsel->scale;
3148         err = process(tool, (union perf_event*) ev, NULL, NULL);
3149         free(ev);
3150         return err;
3151 }
3152 
3153 int
3154 perf_event__synthesize_event_update_name(struct perf_tool *tool,
3155                                          struct perf_evsel *evsel,
3156                                          perf_event__handler_t process)
3157 {
3158         struct event_update_event *ev;
3159         size_t len = strlen(evsel->name);
3160         int err;
3161 
3162         ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->id[0]);
3163         if (ev == NULL)
3164                 return -ENOMEM;
3165 
3166         strncpy(ev->data, evsel->name, len);
3167         err = process(tool, (union perf_event*) ev, NULL, NULL);
3168         free(ev);
3169         return err;
3170 }
3171 
3172 int
3173 perf_event__synthesize_event_update_cpus(struct perf_tool *tool,
3174                                         struct perf_evsel *evsel,
3175                                         perf_event__handler_t process)
3176 {
3177         size_t size = sizeof(struct event_update_event);
3178         struct event_update_event *ev;
3179         int max, err;
3180         u16 type;
3181 
3182         if (!evsel->own_cpus)
3183                 return 0;
3184 
3185         ev = cpu_map_data__alloc(evsel->own_cpus, &size, &type, &max);
3186         if (!ev)
3187                 return -ENOMEM;
3188 
3189         ev->header.type = PERF_RECORD_EVENT_UPDATE;
3190         ev->header.size = (u16)size;
3191         ev->type = PERF_EVENT_UPDATE__CPUS;
3192         ev->id   = evsel->id[0];
3193 
3194         cpu_map_data__synthesize((struct cpu_map_data *) ev->data,
3195                                  evsel->own_cpus,
3196                                  type, max);
3197 
3198         err = process(tool, (union perf_event*) ev, NULL, NULL);
3199         free(ev);
3200         return err;
3201 }
3202 
3203 size_t perf_event__fprintf_event_update(union perf_event *event, FILE *fp)
3204 {
3205         struct event_update_event *ev = &event->event_update;
3206         struct event_update_event_scale *ev_scale;
3207         struct event_update_event_cpus *ev_cpus;
3208         struct cpu_map *map;
3209         size_t ret;
3210 
3211         ret = fprintf(fp, "\n... id:    %" PRIu64 "\n", ev->id);
3212 
3213         switch (ev->type) {
3214         case PERF_EVENT_UPDATE__SCALE:
3215                 ev_scale = (struct event_update_event_scale *) ev->data;
3216                 ret += fprintf(fp, "... scale: %f\n", ev_scale->scale);
3217                 break;
3218         case PERF_EVENT_UPDATE__UNIT:
3219                 ret += fprintf(fp, "... unit:  %s\n", ev->data);
3220                 break;
3221         case PERF_EVENT_UPDATE__NAME:
3222                 ret += fprintf(fp, "... name:  %s\n", ev->data);
3223                 break;
3224         case PERF_EVENT_UPDATE__CPUS:
3225                 ev_cpus = (struct event_update_event_cpus *) ev->data;
3226                 ret += fprintf(fp, "... ");
3227 
3228                 map = cpu_map__new_data(&ev_cpus->cpus);
3229                 if (map)
3230                         ret += cpu_map__fprintf(map, fp);
3231                 else
3232                         ret += fprintf(fp, "failed to get cpus\n");
3233                 break;
3234         default:
3235                 ret += fprintf(fp, "... unknown type\n");
3236                 break;
3237         }
3238 
3239         return ret;
3240 }
3241 
3242 int perf_event__synthesize_attrs(struct perf_tool *tool,
3243                                    struct perf_session *session,
3244                                    perf_event__handler_t process)
3245 {
3246         struct perf_evsel *evsel;
3247         int err = 0;
3248 
3249         evlist__for_each_entry(session->evlist, evsel) {
3250                 err = perf_event__synthesize_attr(tool, &evsel->attr, evsel->ids,
3251                                                   evsel->id, process);
3252                 if (err) {
3253                         pr_debug("failed to create perf header attribute\n");
3254                         return err;
3255                 }
3256         }
3257 
3258         return err;
3259 }
3260 
3261 int perf_event__process_attr(struct perf_tool *tool __maybe_unused,
3262                              union perf_event *event,
3263                              struct perf_evlist **pevlist)
3264 {
3265         u32 i, ids, n_ids;
3266         struct perf_evsel *evsel;
3267         struct perf_evlist *evlist = *pevlist;
3268 
3269         if (evlist == NULL) {
3270                 *pevlist = evlist = perf_evlist__new();
3271                 if (evlist == NULL)
3272                         return -ENOMEM;
3273         }
3274 
3275         evsel = perf_evsel__new(&event->attr.attr);
3276         if (evsel == NULL)
3277                 return -ENOMEM;
3278 
3279         perf_evlist__add(evlist, evsel);
3280 
3281         ids = event->header.size;
3282         ids -= (void *)&event->attr.id - (void *)event;
3283         n_ids = ids / sizeof(u64);
3284         /*
3285          * We don't have the cpu and thread maps on the header, so
3286          * for allocating the perf_sample_id table we fake 1 cpu and
3287          * hattr->ids threads.
3288          */
3289         if (perf_evsel__alloc_id(evsel, 1, n_ids))
3290                 return -ENOMEM;
3291 
3292         for (i = 0; i < n_ids; i++) {
3293                 perf_evlist__id_add(evlist, evsel, 0, i, event->attr.id[i]);
3294         }
3295 
3296         symbol_conf.nr_events = evlist->nr_entries;
3297 
3298         return 0;
3299 }
3300 
3301 int perf_event__process_event_update(struct perf_tool *tool __maybe_unused,
3302                                      union perf_event *event,
3303                                      struct perf_evlist **pevlist)
3304 {
3305         struct event_update_event *ev = &event->event_update;
3306         struct event_update_event_scale *ev_scale;
3307         struct event_update_event_cpus *ev_cpus;
3308         struct perf_evlist *evlist;
3309         struct perf_evsel *evsel;
3310         struct cpu_map *map;
3311 
3312         if (!pevlist || *pevlist == NULL)
3313                 return -EINVAL;
3314 
3315         evlist = *pevlist;
3316 
3317         evsel = perf_evlist__id2evsel(evlist, ev->id);
3318         if (evsel == NULL)
3319                 return -EINVAL;
3320 
3321         switch (ev->type) {
3322         case PERF_EVENT_UPDATE__UNIT:
3323                 evsel->unit = strdup(ev->data);
3324                 break;
3325         case PERF_EVENT_UPDATE__NAME:
3326                 evsel->name = strdup(ev->data);
3327                 break;
3328         case PERF_EVENT_UPDATE__SCALE:
3329                 ev_scale = (struct event_update_event_scale *) ev->data;
3330                 evsel->scale = ev_scale->scale;
3331                 break;
3332         case PERF_EVENT_UPDATE__CPUS:
3333                 ev_cpus = (struct event_update_event_cpus *) ev->data;
3334 
3335                 map = cpu_map__new_data(&ev_cpus->cpus);
3336                 if (map)
3337                         evsel->own_cpus = map;
3338                 else
3339                         pr_err("failed to get event_update cpus\n");
3340         default:
3341                 break;
3342         }
3343 
3344         return 0;
3345 }
3346 
3347 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd,
3348                                         struct perf_evlist *evlist,
3349                                         perf_event__handler_t process)
3350 {
3351         union perf_event ev;
3352         struct tracing_data *tdata;
3353         ssize_t size = 0, aligned_size = 0, padding;
3354         struct feat_fd ff;
3355         int err __maybe_unused = 0;
3356 
3357         /*
3358          * We are going to store the size of the data followed
3359          * by the data contents. Since the fd descriptor is a pipe,
3360          * we cannot seek back to store the size of the data once
3361          * we know it. Instead we:
3362          *
3363          * - write the tracing data to the temp file
3364          * - get/write the data size to pipe
3365          * - write the tracing data from the temp file
3366          *   to the pipe
3367          */
3368         tdata = tracing_data_get(&evlist->entries, fd, true);
3369         if (!tdata)
3370                 return -1;
3371 
3372         memset(&ev, 0, sizeof(ev));
3373 
3374         ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
3375         size = tdata->size;
3376         aligned_size = PERF_ALIGN(size, sizeof(u64));
3377         padding = aligned_size - size;
3378         ev.tracing_data.header.size = sizeof(ev.tracing_data);
3379         ev.tracing_data.size = aligned_size;
3380 
3381         process(tool, &ev, NULL, NULL);
3382 
3383         /*
3384          * The put function will copy all the tracing data
3385          * stored in temp file to the pipe.
3386          */
3387         tracing_data_put(tdata);
3388 
3389         ff = (struct feat_fd){ .fd = fd };
3390         if (write_padded(&ff, NULL, 0, padding))
3391                 return -1;
3392 
3393         return aligned_size;
3394 }
3395 
3396 int perf_event__process_tracing_data(struct perf_tool *tool __maybe_unused,
3397                                      union perf_event *event,
3398                                      struct perf_session *session)
3399 {
3400         ssize_t size_read, padding, size = event->tracing_data.size;
3401         int fd = perf_data__fd(session->data);
3402         off_t offset = lseek(fd, 0, SEEK_CUR);
3403         char buf[BUFSIZ];
3404 
3405         /* setup for reading amidst mmap */
3406         lseek(fd, offset + sizeof(struct tracing_data_event),
3407               SEEK_SET);
3408 
3409         size_read = trace_report(fd, &session->tevent,
3410                                  session->repipe);
3411         padding = PERF_ALIGN(size_read, sizeof(u64)) - size_read;
3412 
3413         if (readn(fd, buf, padding) < 0) {
3414                 pr_err("%s: reading input file", __func__);
3415                 return -1;
3416         }
3417         if (session->repipe) {
3418                 int retw = write(STDOUT_FILENO, buf, padding);
3419                 if (retw <= 0 || retw != padding) {
3420                         pr_err("%s: repiping tracing data padding", __func__);
3421                         return -1;
3422                 }
3423         }
3424 
3425         if (size_read + padding != size) {
3426                 pr_err("%s: tracing data size mismatch", __func__);
3427                 return -1;
3428         }
3429 
3430         perf_evlist__prepare_tracepoint_events(session->evlist,
3431                                                session->tevent.pevent);
3432 
3433         return size_read + padding;
3434 }
3435 
3436 int perf_event__synthesize_build_id(struct perf_tool *tool,
3437                                     struct dso *pos, u16 misc,
3438                                     perf_event__handler_t process,
3439                                     struct machine *machine)
3440 {
3441         union perf_event ev;
3442         size_t len;
3443         int err = 0;
3444 
3445         if (!pos->hit)
3446                 return err;
3447 
3448         memset(&ev, 0, sizeof(ev));
3449 
3450         len = pos->long_name_len + 1;
3451         len = PERF_ALIGN(len, NAME_ALIGN);
3452         memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
3453         ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
3454         ev.build_id.header.misc = misc;
3455         ev.build_id.pid = machine->pid;
3456         ev.build_id.header.size = sizeof(ev.build_id) + len;
3457         memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
3458 
3459         err = process(tool, &ev, NULL, machine);
3460 
3461         return err;
3462 }
3463 
3464 int perf_event__process_build_id(struct perf_tool *tool __maybe_unused,
3465                                  union perf_event *event,
3466                                  struct perf_session *session)
3467 {
3468         __event_process_build_id(&event->build_id,
3469                                  event->build_id.filename,
3470                                  session);
3471         return 0;
3472 }
3473 

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