7 #include <linux/list.h>
8 #include <linux/kernel.h>
9 #include <linux/bitops.h>
10 #include <sys/utsname.h>
16 #include "trace-event.h"
29 * must be a numerical value to let the endianness
30 * determine the memory layout. That way we are able
31 * to detect endianness when reading the perf.data file
34 * we check for legacy (PERFFILE) format.
36 static const char *__perf_magic1 = "PERFFILE";
37 static const u64 __perf_magic2 = 0x32454c4946524550ULL;
38 static const u64 __perf_magic2_sw = 0x50455246494c4532ULL;
40 #define PERF_MAGIC __perf_magic2
42 struct perf_file_attr {
43 struct perf_event_attr attr;
44 struct perf_file_section ids;
47 void perf_header__set_feat(struct perf_header *header, int feat)
49 set_bit(feat, header->adds_features);
52 void perf_header__clear_feat(struct perf_header *header, int feat)
54 clear_bit(feat, header->adds_features);
57 bool perf_header__has_feat(const struct perf_header *header, int feat)
59 return test_bit(feat, header->adds_features);
62 static int do_write(int fd, const void *buf, size_t size)
65 int ret = write(fd, buf, size);
77 int write_padded(int fd, const void *bf, size_t count, size_t count_aligned)
79 static const char zero_buf[NAME_ALIGN];
80 int err = do_write(fd, bf, count);
83 err = do_write(fd, zero_buf, count_aligned - count);
88 #define string_size(str) \
89 (PERF_ALIGN((strlen(str) + 1), NAME_ALIGN) + sizeof(u32))
91 static int do_write_string(int fd, const char *str)
96 olen = strlen(str) + 1;
97 len = PERF_ALIGN(olen, NAME_ALIGN);
99 /* write len, incl. \0 */
100 ret = do_write(fd, &len, sizeof(len));
104 return write_padded(fd, str, olen, len);
107 static char *do_read_string(int fd, struct perf_header *ph)
113 sz = readn(fd, &len, sizeof(len));
114 if (sz < (ssize_t)sizeof(len))
124 ret = readn(fd, buf, len);
125 if (ret == (ssize_t)len) {
127 * strings are padded by zeroes
128 * thus the actual strlen of buf
129 * may be less than len
138 static int write_tracing_data(int fd, struct perf_header *h __maybe_unused,
139 struct perf_evlist *evlist)
141 return read_tracing_data(fd, &evlist->entries);
145 static int write_build_id(int fd, struct perf_header *h,
146 struct perf_evlist *evlist __maybe_unused)
148 struct perf_session *session;
151 session = container_of(h, struct perf_session, header);
153 if (!perf_session__read_build_ids(session, true))
156 err = perf_session__write_buildid_table(session, fd);
158 pr_debug("failed to write buildid table\n");
161 perf_session__cache_build_ids(session);
166 static int write_hostname(int fd, struct perf_header *h __maybe_unused,
167 struct perf_evlist *evlist __maybe_unused)
176 return do_write_string(fd, uts.nodename);
179 static int write_osrelease(int fd, struct perf_header *h __maybe_unused,
180 struct perf_evlist *evlist __maybe_unused)
189 return do_write_string(fd, uts.release);
192 static int write_arch(int fd, struct perf_header *h __maybe_unused,
193 struct perf_evlist *evlist __maybe_unused)
202 return do_write_string(fd, uts.machine);
205 static int write_version(int fd, struct perf_header *h __maybe_unused,
206 struct perf_evlist *evlist __maybe_unused)
208 return do_write_string(fd, perf_version_string);
211 static int __write_cpudesc(int fd, const char *cpuinfo_proc)
216 const char *search = cpuinfo_proc;
223 file = fopen("/proc/cpuinfo", "r");
227 while (getline(&buf, &len, file) > 0) {
228 ret = strncmp(buf, search, strlen(search));
240 p = strchr(buf, ':');
241 if (p && *(p+1) == ' ' && *(p+2))
247 /* squash extra space characters (branding string) */
254 while (*q && isspace(*q))
257 while ((*r++ = *q++));
261 ret = do_write_string(fd, s);
268 static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,
269 struct perf_evlist *evlist __maybe_unused)
272 #define CPUINFO_PROC {"model name", }
274 const char *cpuinfo_procs[] = CPUINFO_PROC;
277 for (i = 0; i < ARRAY_SIZE(cpuinfo_procs); i++) {
279 ret = __write_cpudesc(fd, cpuinfo_procs[i]);
287 static int write_nrcpus(int fd, struct perf_header *h __maybe_unused,
288 struct perf_evlist *evlist __maybe_unused)
294 nr = sysconf(_SC_NPROCESSORS_CONF);
298 nrc = (u32)(nr & UINT_MAX);
300 nr = sysconf(_SC_NPROCESSORS_ONLN);
304 nra = (u32)(nr & UINT_MAX);
306 ret = do_write(fd, &nrc, sizeof(nrc));
310 return do_write(fd, &nra, sizeof(nra));
313 static int write_event_desc(int fd, struct perf_header *h __maybe_unused,
314 struct perf_evlist *evlist)
316 struct perf_evsel *evsel;
320 nre = evlist->nr_entries;
323 * write number of events
325 ret = do_write(fd, &nre, sizeof(nre));
330 * size of perf_event_attr struct
332 sz = (u32)sizeof(evsel->attr);
333 ret = do_write(fd, &sz, sizeof(sz));
337 evlist__for_each(evlist, evsel) {
338 ret = do_write(fd, &evsel->attr, sz);
342 * write number of unique id per event
343 * there is one id per instance of an event
345 * copy into an nri to be independent of the
349 ret = do_write(fd, &nri, sizeof(nri));
354 * write event string as passed on cmdline
356 ret = do_write_string(fd, perf_evsel__name(evsel));
360 * write unique ids for this event
362 ret = do_write(fd, evsel->id, evsel->ids * sizeof(u64));
369 static int write_cmdline(int fd, struct perf_header *h __maybe_unused,
370 struct perf_evlist *evlist __maybe_unused)
372 char buf[MAXPATHLEN];
378 * actual atual path to perf binary
380 sprintf(proc, "/proc/%d/exe", getpid());
381 ret = readlink(proc, buf, sizeof(buf));
385 /* readlink() does not add null termination */
388 /* account for binary path */
389 n = perf_env.nr_cmdline + 1;
391 ret = do_write(fd, &n, sizeof(n));
395 ret = do_write_string(fd, buf);
399 for (i = 0 ; i < perf_env.nr_cmdline; i++) {
400 ret = do_write_string(fd, perf_env.cmdline_argv[i]);
407 #define CORE_SIB_FMT \
408 "/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
409 #define THRD_SIB_FMT \
410 "/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
416 char **core_siblings;
417 char **thread_siblings;
420 static int build_cpu_topo(struct cpu_topo *tp, int cpu)
423 char filename[MAXPATHLEN];
424 char *buf = NULL, *p;
430 sprintf(filename, CORE_SIB_FMT, cpu);
431 fp = fopen(filename, "r");
435 sret = getline(&buf, &len, fp);
440 p = strchr(buf, '\n');
444 for (i = 0; i < tp->core_sib; i++) {
445 if (!strcmp(buf, tp->core_siblings[i]))
448 if (i == tp->core_sib) {
449 tp->core_siblings[i] = buf;
457 sprintf(filename, THRD_SIB_FMT, cpu);
458 fp = fopen(filename, "r");
462 if (getline(&buf, &len, fp) <= 0)
465 p = strchr(buf, '\n');
469 for (i = 0; i < tp->thread_sib; i++) {
470 if (!strcmp(buf, tp->thread_siblings[i]))
473 if (i == tp->thread_sib) {
474 tp->thread_siblings[i] = buf;
486 static void free_cpu_topo(struct cpu_topo *tp)
493 for (i = 0 ; i < tp->core_sib; i++)
494 zfree(&tp->core_siblings[i]);
496 for (i = 0 ; i < tp->thread_sib; i++)
497 zfree(&tp->thread_siblings[i]);
502 static struct cpu_topo *build_cpu_topology(void)
511 ncpus = sysconf(_SC_NPROCESSORS_CONF);
515 nr = (u32)(ncpus & UINT_MAX);
517 sz = nr * sizeof(char *);
519 addr = calloc(1, sizeof(*tp) + 2 * sz);
526 tp->core_siblings = addr;
528 tp->thread_siblings = addr;
530 for (i = 0; i < nr; i++) {
531 ret = build_cpu_topo(tp, i);
542 static int write_cpu_topology(int fd, struct perf_header *h __maybe_unused,
543 struct perf_evlist *evlist __maybe_unused)
549 tp = build_cpu_topology();
553 ret = do_write(fd, &tp->core_sib, sizeof(tp->core_sib));
557 for (i = 0; i < tp->core_sib; i++) {
558 ret = do_write_string(fd, tp->core_siblings[i]);
562 ret = do_write(fd, &tp->thread_sib, sizeof(tp->thread_sib));
566 for (i = 0; i < tp->thread_sib; i++) {
567 ret = do_write_string(fd, tp->thread_siblings[i]);
572 ret = perf_env__read_cpu_topology_map(&perf_env);
576 for (j = 0; j < perf_env.nr_cpus_avail; j++) {
577 ret = do_write(fd, &perf_env.cpu[j].core_id,
578 sizeof(perf_env.cpu[j].core_id));
581 ret = do_write(fd, &perf_env.cpu[j].socket_id,
582 sizeof(perf_env.cpu[j].socket_id));
593 static int write_total_mem(int fd, struct perf_header *h __maybe_unused,
594 struct perf_evlist *evlist __maybe_unused)
602 fp = fopen("/proc/meminfo", "r");
606 while (getline(&buf, &len, fp) > 0) {
607 ret = strncmp(buf, "MemTotal:", 9);
612 n = sscanf(buf, "%*s %"PRIu64, &mem);
614 ret = do_write(fd, &mem, sizeof(mem));
622 static int write_topo_node(int fd, int node)
624 char str[MAXPATHLEN];
626 char *buf = NULL, *p;
629 u64 mem_total, mem_free, mem;
632 sprintf(str, "/sys/devices/system/node/node%d/meminfo", node);
633 fp = fopen(str, "r");
637 while (getline(&buf, &len, fp) > 0) {
638 /* skip over invalid lines */
639 if (!strchr(buf, ':'))
641 if (sscanf(buf, "%*s %*d %31s %"PRIu64, field, &mem) != 2)
643 if (!strcmp(field, "MemTotal:"))
645 if (!strcmp(field, "MemFree:"))
652 ret = do_write(fd, &mem_total, sizeof(u64));
656 ret = do_write(fd, &mem_free, sizeof(u64));
661 sprintf(str, "/sys/devices/system/node/node%d/cpulist", node);
663 fp = fopen(str, "r");
667 if (getline(&buf, &len, fp) <= 0)
670 p = strchr(buf, '\n');
674 ret = do_write_string(fd, buf);
682 static int write_numa_topology(int fd, struct perf_header *h __maybe_unused,
683 struct perf_evlist *evlist __maybe_unused)
688 struct cpu_map *node_map = NULL;
693 fp = fopen("/sys/devices/system/node/online", "r");
697 if (getline(&buf, &len, fp) <= 0)
700 c = strchr(buf, '\n');
704 node_map = cpu_map__new(buf);
708 nr = (u32)node_map->nr;
710 ret = do_write(fd, &nr, sizeof(nr));
714 for (i = 0; i < nr; i++) {
715 j = (u32)node_map->map[i];
716 ret = do_write(fd, &j, sizeof(j));
720 ret = write_topo_node(fd, i);
734 * struct pmu_mappings {
743 static int write_pmu_mappings(int fd, struct perf_header *h __maybe_unused,
744 struct perf_evlist *evlist __maybe_unused)
746 struct perf_pmu *pmu = NULL;
747 off_t offset = lseek(fd, 0, SEEK_CUR);
751 /* write real pmu_num later */
752 ret = do_write(fd, &pmu_num, sizeof(pmu_num));
756 while ((pmu = perf_pmu__scan(pmu))) {
761 ret = do_write(fd, &pmu->type, sizeof(pmu->type));
765 ret = do_write_string(fd, pmu->name);
770 if (pwrite(fd, &pmu_num, sizeof(pmu_num), offset) != sizeof(pmu_num)) {
772 lseek(fd, offset, SEEK_SET);
782 * struct group_descs {
784 * struct group_desc {
791 static int write_group_desc(int fd, struct perf_header *h __maybe_unused,
792 struct perf_evlist *evlist)
794 u32 nr_groups = evlist->nr_groups;
795 struct perf_evsel *evsel;
798 ret = do_write(fd, &nr_groups, sizeof(nr_groups));
802 evlist__for_each(evlist, evsel) {
803 if (perf_evsel__is_group_leader(evsel) &&
804 evsel->nr_members > 1) {
805 const char *name = evsel->group_name ?: "{anon_group}";
806 u32 leader_idx = evsel->idx;
807 u32 nr_members = evsel->nr_members;
809 ret = do_write_string(fd, name);
813 ret = do_write(fd, &leader_idx, sizeof(leader_idx));
817 ret = do_write(fd, &nr_members, sizeof(nr_members));
826 * default get_cpuid(): nothing gets recorded
827 * actual implementation must be in arch/$(ARCH)/util/header.c
829 int __attribute__ ((weak)) get_cpuid(char *buffer __maybe_unused,
830 size_t sz __maybe_unused)
835 static int write_cpuid(int fd, struct perf_header *h __maybe_unused,
836 struct perf_evlist *evlist __maybe_unused)
841 ret = get_cpuid(buffer, sizeof(buffer));
847 return do_write_string(fd, buffer);
850 static int write_branch_stack(int fd __maybe_unused,
851 struct perf_header *h __maybe_unused,
852 struct perf_evlist *evlist __maybe_unused)
857 static int write_auxtrace(int fd, struct perf_header *h,
858 struct perf_evlist *evlist __maybe_unused)
860 struct perf_session *session;
863 session = container_of(h, struct perf_session, header);
865 err = auxtrace_index__write(fd, &session->auxtrace_index);
867 pr_err("Failed to write auxtrace index\n");
871 static void print_hostname(struct perf_header *ph, int fd __maybe_unused,
874 fprintf(fp, "# hostname : %s\n", ph->env.hostname);
877 static void print_osrelease(struct perf_header *ph, int fd __maybe_unused,
880 fprintf(fp, "# os release : %s\n", ph->env.os_release);
883 static void print_arch(struct perf_header *ph, int fd __maybe_unused, FILE *fp)
885 fprintf(fp, "# arch : %s\n", ph->env.arch);
888 static void print_cpudesc(struct perf_header *ph, int fd __maybe_unused,
891 fprintf(fp, "# cpudesc : %s\n", ph->env.cpu_desc);
894 static void print_nrcpus(struct perf_header *ph, int fd __maybe_unused,
897 fprintf(fp, "# nrcpus online : %u\n", ph->env.nr_cpus_online);
898 fprintf(fp, "# nrcpus avail : %u\n", ph->env.nr_cpus_avail);
901 static void print_version(struct perf_header *ph, int fd __maybe_unused,
904 fprintf(fp, "# perf version : %s\n", ph->env.version);
907 static void print_cmdline(struct perf_header *ph, int fd __maybe_unused,
912 nr = ph->env.nr_cmdline;
914 fprintf(fp, "# cmdline : ");
916 for (i = 0; i < nr; i++)
917 fprintf(fp, "%s ", ph->env.cmdline_argv[i]);
921 static void print_cpu_topology(struct perf_header *ph, int fd __maybe_unused,
926 int cpu_nr = ph->env.nr_cpus_online;
928 nr = ph->env.nr_sibling_cores;
929 str = ph->env.sibling_cores;
931 for (i = 0; i < nr; i++) {
932 fprintf(fp, "# sibling cores : %s\n", str);
933 str += strlen(str) + 1;
936 nr = ph->env.nr_sibling_threads;
937 str = ph->env.sibling_threads;
939 for (i = 0; i < nr; i++) {
940 fprintf(fp, "# sibling threads : %s\n", str);
941 str += strlen(str) + 1;
944 if (ph->env.cpu != NULL) {
945 for (i = 0; i < cpu_nr; i++)
946 fprintf(fp, "# CPU %d: Core ID %d, Socket ID %d\n", i,
947 ph->env.cpu[i].core_id, ph->env.cpu[i].socket_id);
949 fprintf(fp, "# Core ID and Socket ID information is not available\n");
952 static void free_event_desc(struct perf_evsel *events)
954 struct perf_evsel *evsel;
959 for (evsel = events; evsel->attr.size; evsel++) {
967 static struct perf_evsel *
968 read_event_desc(struct perf_header *ph, int fd)
970 struct perf_evsel *evsel, *events = NULL;
973 u32 nre, sz, nr, i, j;
977 /* number of events */
978 ret = readn(fd, &nre, sizeof(nre));
979 if (ret != (ssize_t)sizeof(nre))
985 ret = readn(fd, &sz, sizeof(sz));
986 if (ret != (ssize_t)sizeof(sz))
992 /* buffer to hold on file attr struct */
997 /* the last event terminates with evsel->attr.size == 0: */
998 events = calloc(nre + 1, sizeof(*events));
1002 msz = sizeof(evsel->attr);
1006 for (i = 0, evsel = events; i < nre; evsel++, i++) {
1010 * must read entire on-file attr struct to
1011 * sync up with layout.
1013 ret = readn(fd, buf, sz);
1014 if (ret != (ssize_t)sz)
1018 perf_event__attr_swap(buf);
1020 memcpy(&evsel->attr, buf, msz);
1022 ret = readn(fd, &nr, sizeof(nr));
1023 if (ret != (ssize_t)sizeof(nr))
1026 if (ph->needs_swap) {
1028 evsel->needs_swap = true;
1031 evsel->name = do_read_string(fd, ph);
1036 id = calloc(nr, sizeof(*id));
1042 for (j = 0 ; j < nr; j++) {
1043 ret = readn(fd, id, sizeof(*id));
1044 if (ret != (ssize_t)sizeof(*id))
1047 *id = bswap_64(*id);
1055 free_event_desc(events);
1060 static int __desc_attr__fprintf(FILE *fp, const char *name, const char *val,
1061 void *priv __attribute__((unused)))
1063 return fprintf(fp, ", %s = %s", name, val);
1066 static void print_event_desc(struct perf_header *ph, int fd, FILE *fp)
1068 struct perf_evsel *evsel, *events = read_event_desc(ph, fd);
1073 fprintf(fp, "# event desc: not available or unable to read\n");
1077 for (evsel = events; evsel->attr.size; evsel++) {
1078 fprintf(fp, "# event : name = %s, ", evsel->name);
1081 fprintf(fp, ", id = {");
1082 for (j = 0, id = evsel->id; j < evsel->ids; j++, id++) {
1085 fprintf(fp, " %"PRIu64, *id);
1090 perf_event_attr__fprintf(fp, &evsel->attr, __desc_attr__fprintf, NULL);
1095 free_event_desc(events);
1098 static void print_total_mem(struct perf_header *ph, int fd __maybe_unused,
1101 fprintf(fp, "# total memory : %Lu kB\n", ph->env.total_mem);
1104 static void print_numa_topology(struct perf_header *ph, int fd __maybe_unused,
1109 uint64_t mem_total, mem_free;
1112 nr = ph->env.nr_numa_nodes;
1113 str = ph->env.numa_nodes;
1115 for (i = 0; i < nr; i++) {
1117 c = strtoul(str, &tmp, 0);
1122 mem_total = strtoull(str, &tmp, 0);
1127 mem_free = strtoull(str, &tmp, 0);
1131 fprintf(fp, "# node%u meminfo : total = %"PRIu64" kB,"
1132 " free = %"PRIu64" kB\n",
1133 c, mem_total, mem_free);
1136 fprintf(fp, "# node%u cpu list : %s\n", c, str);
1138 str += strlen(str) + 1;
1142 fprintf(fp, "# numa topology : not available\n");
1145 static void print_cpuid(struct perf_header *ph, int fd __maybe_unused, FILE *fp)
1147 fprintf(fp, "# cpuid : %s\n", ph->env.cpuid);
1150 static void print_branch_stack(struct perf_header *ph __maybe_unused,
1151 int fd __maybe_unused, FILE *fp)
1153 fprintf(fp, "# contains samples with branch stack\n");
1156 static void print_auxtrace(struct perf_header *ph __maybe_unused,
1157 int fd __maybe_unused, FILE *fp)
1159 fprintf(fp, "# contains AUX area data (e.g. instruction trace)\n");
1162 static void print_pmu_mappings(struct perf_header *ph, int fd __maybe_unused,
1165 const char *delimiter = "# pmu mappings: ";
1170 pmu_num = ph->env.nr_pmu_mappings;
1172 fprintf(fp, "# pmu mappings: not available\n");
1176 str = ph->env.pmu_mappings;
1179 type = strtoul(str, &tmp, 0);
1184 fprintf(fp, "%s%s = %" PRIu32, delimiter, str, type);
1187 str += strlen(str) + 1;
1196 fprintf(fp, "# pmu mappings: unable to read\n");
1199 static void print_group_desc(struct perf_header *ph, int fd __maybe_unused,
1202 struct perf_session *session;
1203 struct perf_evsel *evsel;
1206 session = container_of(ph, struct perf_session, header);
1208 evlist__for_each(session->evlist, evsel) {
1209 if (perf_evsel__is_group_leader(evsel) &&
1210 evsel->nr_members > 1) {
1211 fprintf(fp, "# group: %s{%s", evsel->group_name ?: "",
1212 perf_evsel__name(evsel));
1214 nr = evsel->nr_members - 1;
1216 fprintf(fp, ",%s", perf_evsel__name(evsel));
1224 static int __event_process_build_id(struct build_id_event *bev,
1226 struct perf_session *session)
1229 struct machine *machine;
1232 enum dso_kernel_type dso_type;
1234 machine = perf_session__findnew_machine(session, bev->pid);
1238 cpumode = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1241 case PERF_RECORD_MISC_KERNEL:
1242 dso_type = DSO_TYPE_KERNEL;
1244 case PERF_RECORD_MISC_GUEST_KERNEL:
1245 dso_type = DSO_TYPE_GUEST_KERNEL;
1247 case PERF_RECORD_MISC_USER:
1248 case PERF_RECORD_MISC_GUEST_USER:
1249 dso_type = DSO_TYPE_USER;
1255 dso = machine__findnew_dso(machine, filename);
1257 char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1259 dso__set_build_id(dso, &bev->build_id);
1261 if (!is_kernel_module(filename, cpumode))
1262 dso->kernel = dso_type;
1264 build_id__sprintf(dso->build_id, sizeof(dso->build_id),
1266 pr_debug("build id event received for %s: %s\n",
1267 dso->long_name, sbuild_id);
1276 static int perf_header__read_build_ids_abi_quirk(struct perf_header *header,
1277 int input, u64 offset, u64 size)
1279 struct perf_session *session = container_of(header, struct perf_session, header);
1281 struct perf_event_header header;
1282 u8 build_id[PERF_ALIGN(BUILD_ID_SIZE, sizeof(u64))];
1285 struct build_id_event bev;
1286 char filename[PATH_MAX];
1287 u64 limit = offset + size;
1289 while (offset < limit) {
1292 if (readn(input, &old_bev, sizeof(old_bev)) != sizeof(old_bev))
1295 if (header->needs_swap)
1296 perf_event_header__bswap(&old_bev.header);
1298 len = old_bev.header.size - sizeof(old_bev);
1299 if (readn(input, filename, len) != len)
1302 bev.header = old_bev.header;
1305 * As the pid is the missing value, we need to fill
1306 * it properly. The header.misc value give us nice hint.
1308 bev.pid = HOST_KERNEL_ID;
1309 if (bev.header.misc == PERF_RECORD_MISC_GUEST_USER ||
1310 bev.header.misc == PERF_RECORD_MISC_GUEST_KERNEL)
1311 bev.pid = DEFAULT_GUEST_KERNEL_ID;
1313 memcpy(bev.build_id, old_bev.build_id, sizeof(bev.build_id));
1314 __event_process_build_id(&bev, filename, session);
1316 offset += bev.header.size;
1322 static int perf_header__read_build_ids(struct perf_header *header,
1323 int input, u64 offset, u64 size)
1325 struct perf_session *session = container_of(header, struct perf_session, header);
1326 struct build_id_event bev;
1327 char filename[PATH_MAX];
1328 u64 limit = offset + size, orig_offset = offset;
1331 while (offset < limit) {
1334 if (readn(input, &bev, sizeof(bev)) != sizeof(bev))
1337 if (header->needs_swap)
1338 perf_event_header__bswap(&bev.header);
1340 len = bev.header.size - sizeof(bev);
1341 if (readn(input, filename, len) != len)
1344 * The a1645ce1 changeset:
1346 * "perf: 'perf kvm' tool for monitoring guest performance from host"
1348 * Added a field to struct build_id_event that broke the file
1351 * Since the kernel build-id is the first entry, process the
1352 * table using the old format if the well known
1353 * '[kernel.kallsyms]' string for the kernel build-id has the
1354 * first 4 characters chopped off (where the pid_t sits).
1356 if (memcmp(filename, "nel.kallsyms]", 13) == 0) {
1357 if (lseek(input, orig_offset, SEEK_SET) == (off_t)-1)
1359 return perf_header__read_build_ids_abi_quirk(header, input, offset, size);
1362 __event_process_build_id(&bev, filename, session);
1364 offset += bev.header.size;
1371 static int process_tracing_data(struct perf_file_section *section __maybe_unused,
1372 struct perf_header *ph __maybe_unused,
1375 ssize_t ret = trace_report(fd, data, false);
1376 return ret < 0 ? -1 : 0;
1379 static int process_build_id(struct perf_file_section *section,
1380 struct perf_header *ph, int fd,
1381 void *data __maybe_unused)
1383 if (perf_header__read_build_ids(ph, fd, section->offset, section->size))
1384 pr_debug("Failed to read buildids, continuing...\n");
1388 static int process_hostname(struct perf_file_section *section __maybe_unused,
1389 struct perf_header *ph, int fd,
1390 void *data __maybe_unused)
1392 ph->env.hostname = do_read_string(fd, ph);
1393 return ph->env.hostname ? 0 : -ENOMEM;
1396 static int process_osrelease(struct perf_file_section *section __maybe_unused,
1397 struct perf_header *ph, int fd,
1398 void *data __maybe_unused)
1400 ph->env.os_release = do_read_string(fd, ph);
1401 return ph->env.os_release ? 0 : -ENOMEM;
1404 static int process_version(struct perf_file_section *section __maybe_unused,
1405 struct perf_header *ph, int fd,
1406 void *data __maybe_unused)
1408 ph->env.version = do_read_string(fd, ph);
1409 return ph->env.version ? 0 : -ENOMEM;
1412 static int process_arch(struct perf_file_section *section __maybe_unused,
1413 struct perf_header *ph, int fd,
1414 void *data __maybe_unused)
1416 ph->env.arch = do_read_string(fd, ph);
1417 return ph->env.arch ? 0 : -ENOMEM;
1420 static int process_nrcpus(struct perf_file_section *section __maybe_unused,
1421 struct perf_header *ph, int fd,
1422 void *data __maybe_unused)
1427 ret = readn(fd, &nr, sizeof(nr));
1428 if (ret != sizeof(nr))
1434 ph->env.nr_cpus_avail = nr;
1436 ret = readn(fd, &nr, sizeof(nr));
1437 if (ret != sizeof(nr))
1443 ph->env.nr_cpus_online = nr;
1447 static int process_cpudesc(struct perf_file_section *section __maybe_unused,
1448 struct perf_header *ph, int fd,
1449 void *data __maybe_unused)
1451 ph->env.cpu_desc = do_read_string(fd, ph);
1452 return ph->env.cpu_desc ? 0 : -ENOMEM;
1455 static int process_cpuid(struct perf_file_section *section __maybe_unused,
1456 struct perf_header *ph, int fd,
1457 void *data __maybe_unused)
1459 ph->env.cpuid = do_read_string(fd, ph);
1460 return ph->env.cpuid ? 0 : -ENOMEM;
1463 static int process_total_mem(struct perf_file_section *section __maybe_unused,
1464 struct perf_header *ph, int fd,
1465 void *data __maybe_unused)
1470 ret = readn(fd, &mem, sizeof(mem));
1471 if (ret != sizeof(mem))
1475 mem = bswap_64(mem);
1477 ph->env.total_mem = mem;
1481 static struct perf_evsel *
1482 perf_evlist__find_by_index(struct perf_evlist *evlist, int idx)
1484 struct perf_evsel *evsel;
1486 evlist__for_each(evlist, evsel) {
1487 if (evsel->idx == idx)
1495 perf_evlist__set_event_name(struct perf_evlist *evlist,
1496 struct perf_evsel *event)
1498 struct perf_evsel *evsel;
1503 evsel = perf_evlist__find_by_index(evlist, event->idx);
1510 evsel->name = strdup(event->name);
1514 process_event_desc(struct perf_file_section *section __maybe_unused,
1515 struct perf_header *header, int fd,
1516 void *data __maybe_unused)
1518 struct perf_session *session;
1519 struct perf_evsel *evsel, *events = read_event_desc(header, fd);
1524 session = container_of(header, struct perf_session, header);
1525 for (evsel = events; evsel->attr.size; evsel++)
1526 perf_evlist__set_event_name(session->evlist, evsel);
1528 free_event_desc(events);
1533 static int process_cmdline(struct perf_file_section *section,
1534 struct perf_header *ph, int fd,
1535 void *data __maybe_unused)
1538 char *str, *cmdline = NULL, **argv = NULL;
1541 ret = readn(fd, &nr, sizeof(nr));
1542 if (ret != sizeof(nr))
1548 ph->env.nr_cmdline = nr;
1550 cmdline = zalloc(section->size + nr + 1);
1554 argv = zalloc(sizeof(char *) * (nr + 1));
1558 for (i = 0; i < nr; i++) {
1559 str = do_read_string(fd, ph);
1563 argv[i] = cmdline + len;
1564 memcpy(argv[i], str, strlen(str) + 1);
1565 len += strlen(str) + 1;
1568 ph->env.cmdline = cmdline;
1569 ph->env.cmdline_argv = (const char **) argv;
1578 static int process_cpu_topology(struct perf_file_section *section,
1579 struct perf_header *ph, int fd,
1580 void *data __maybe_unused)
1586 int cpu_nr = ph->env.nr_cpus_online;
1589 ph->env.cpu = calloc(cpu_nr, sizeof(*ph->env.cpu));
1593 ret = readn(fd, &nr, sizeof(nr));
1594 if (ret != sizeof(nr))
1600 ph->env.nr_sibling_cores = nr;
1601 size += sizeof(u32);
1602 strbuf_init(&sb, 128);
1604 for (i = 0; i < nr; i++) {
1605 str = do_read_string(fd, ph);
1609 /* include a NULL character at the end */
1610 strbuf_add(&sb, str, strlen(str) + 1);
1611 size += string_size(str);
1614 ph->env.sibling_cores = strbuf_detach(&sb, NULL);
1616 ret = readn(fd, &nr, sizeof(nr));
1617 if (ret != sizeof(nr))
1623 ph->env.nr_sibling_threads = nr;
1624 size += sizeof(u32);
1626 for (i = 0; i < nr; i++) {
1627 str = do_read_string(fd, ph);
1631 /* include a NULL character at the end */
1632 strbuf_add(&sb, str, strlen(str) + 1);
1633 size += string_size(str);
1636 ph->env.sibling_threads = strbuf_detach(&sb, NULL);
1639 * The header may be from old perf,
1640 * which doesn't include core id and socket id information.
1642 if (section->size <= size) {
1643 zfree(&ph->env.cpu);
1647 for (i = 0; i < (u32)cpu_nr; i++) {
1648 ret = readn(fd, &nr, sizeof(nr));
1649 if (ret != sizeof(nr))
1655 if (nr > (u32)cpu_nr) {
1656 pr_debug("core_id number is too big."
1657 "You may need to upgrade the perf tool.\n");
1660 ph->env.cpu[i].core_id = nr;
1662 ret = readn(fd, &nr, sizeof(nr));
1663 if (ret != sizeof(nr))
1669 if (nr > (u32)cpu_nr) {
1670 pr_debug("socket_id number is too big."
1671 "You may need to upgrade the perf tool.\n");
1675 ph->env.cpu[i].socket_id = nr;
1681 strbuf_release(&sb);
1683 zfree(&ph->env.cpu);
1687 static int process_numa_topology(struct perf_file_section *section __maybe_unused,
1688 struct perf_header *ph, int fd,
1689 void *data __maybe_unused)
1694 uint64_t mem_total, mem_free;
1698 ret = readn(fd, &nr, sizeof(nr));
1699 if (ret != sizeof(nr))
1705 ph->env.nr_numa_nodes = nr;
1706 strbuf_init(&sb, 256);
1708 for (i = 0; i < nr; i++) {
1710 ret = readn(fd, &node, sizeof(node));
1711 if (ret != sizeof(node))
1714 ret = readn(fd, &mem_total, sizeof(u64));
1715 if (ret != sizeof(u64))
1718 ret = readn(fd, &mem_free, sizeof(u64));
1719 if (ret != sizeof(u64))
1722 if (ph->needs_swap) {
1723 node = bswap_32(node);
1724 mem_total = bswap_64(mem_total);
1725 mem_free = bswap_64(mem_free);
1728 strbuf_addf(&sb, "%u:%"PRIu64":%"PRIu64":",
1729 node, mem_total, mem_free);
1731 str = do_read_string(fd, ph);
1735 /* include a NULL character at the end */
1736 strbuf_add(&sb, str, strlen(str) + 1);
1739 ph->env.numa_nodes = strbuf_detach(&sb, NULL);
1743 strbuf_release(&sb);
1747 static int process_pmu_mappings(struct perf_file_section *section __maybe_unused,
1748 struct perf_header *ph, int fd,
1749 void *data __maybe_unused)
1757 ret = readn(fd, &pmu_num, sizeof(pmu_num));
1758 if (ret != sizeof(pmu_num))
1762 pmu_num = bswap_32(pmu_num);
1765 pr_debug("pmu mappings not available\n");
1769 ph->env.nr_pmu_mappings = pmu_num;
1770 strbuf_init(&sb, 128);
1773 if (readn(fd, &type, sizeof(type)) != sizeof(type))
1776 type = bswap_32(type);
1778 name = do_read_string(fd, ph);
1782 strbuf_addf(&sb, "%u:%s", type, name);
1783 /* include a NULL character at the end */
1784 strbuf_add(&sb, "", 1);
1786 if (!strcmp(name, "msr"))
1787 ph->env.msr_pmu_type = type;
1792 ph->env.pmu_mappings = strbuf_detach(&sb, NULL);
1796 strbuf_release(&sb);
1800 static int process_group_desc(struct perf_file_section *section __maybe_unused,
1801 struct perf_header *ph, int fd,
1802 void *data __maybe_unused)
1805 u32 i, nr, nr_groups;
1806 struct perf_session *session;
1807 struct perf_evsel *evsel, *leader = NULL;
1814 if (readn(fd, &nr_groups, sizeof(nr_groups)) != sizeof(nr_groups))
1818 nr_groups = bswap_32(nr_groups);
1820 ph->env.nr_groups = nr_groups;
1822 pr_debug("group desc not available\n");
1826 desc = calloc(nr_groups, sizeof(*desc));
1830 for (i = 0; i < nr_groups; i++) {
1831 desc[i].name = do_read_string(fd, ph);
1835 if (readn(fd, &desc[i].leader_idx, sizeof(u32)) != sizeof(u32))
1838 if (readn(fd, &desc[i].nr_members, sizeof(u32)) != sizeof(u32))
1841 if (ph->needs_swap) {
1842 desc[i].leader_idx = bswap_32(desc[i].leader_idx);
1843 desc[i].nr_members = bswap_32(desc[i].nr_members);
1848 * Rebuild group relationship based on the group_desc
1850 session = container_of(ph, struct perf_session, header);
1851 session->evlist->nr_groups = nr_groups;
1854 evlist__for_each(session->evlist, evsel) {
1855 if (evsel->idx == (int) desc[i].leader_idx) {
1856 evsel->leader = evsel;
1857 /* {anon_group} is a dummy name */
1858 if (strcmp(desc[i].name, "{anon_group}")) {
1859 evsel->group_name = desc[i].name;
1860 desc[i].name = NULL;
1862 evsel->nr_members = desc[i].nr_members;
1864 if (i >= nr_groups || nr > 0) {
1865 pr_debug("invalid group desc\n");
1870 nr = evsel->nr_members - 1;
1873 /* This is a group member */
1874 evsel->leader = leader;
1880 if (i != nr_groups || nr != 0) {
1881 pr_debug("invalid group desc\n");
1887 for (i = 0; i < nr_groups; i++)
1888 zfree(&desc[i].name);
1894 static int process_auxtrace(struct perf_file_section *section,
1895 struct perf_header *ph, int fd,
1896 void *data __maybe_unused)
1898 struct perf_session *session;
1901 session = container_of(ph, struct perf_session, header);
1903 err = auxtrace_index__process(fd, section->size, session,
1906 pr_err("Failed to process auxtrace index\n");
1910 struct feature_ops {
1911 int (*write)(int fd, struct perf_header *h, struct perf_evlist *evlist);
1912 void (*print)(struct perf_header *h, int fd, FILE *fp);
1913 int (*process)(struct perf_file_section *section,
1914 struct perf_header *h, int fd, void *data);
1919 #define FEAT_OPA(n, func) \
1920 [n] = { .name = #n, .write = write_##func, .print = print_##func }
1921 #define FEAT_OPP(n, func) \
1922 [n] = { .name = #n, .write = write_##func, .print = print_##func, \
1923 .process = process_##func }
1924 #define FEAT_OPF(n, func) \
1925 [n] = { .name = #n, .write = write_##func, .print = print_##func, \
1926 .process = process_##func, .full_only = true }
1928 /* feature_ops not implemented: */
1929 #define print_tracing_data NULL
1930 #define print_build_id NULL
1932 static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
1933 FEAT_OPP(HEADER_TRACING_DATA, tracing_data),
1934 FEAT_OPP(HEADER_BUILD_ID, build_id),
1935 FEAT_OPP(HEADER_HOSTNAME, hostname),
1936 FEAT_OPP(HEADER_OSRELEASE, osrelease),
1937 FEAT_OPP(HEADER_VERSION, version),
1938 FEAT_OPP(HEADER_ARCH, arch),
1939 FEAT_OPP(HEADER_NRCPUS, nrcpus),
1940 FEAT_OPP(HEADER_CPUDESC, cpudesc),
1941 FEAT_OPP(HEADER_CPUID, cpuid),
1942 FEAT_OPP(HEADER_TOTAL_MEM, total_mem),
1943 FEAT_OPP(HEADER_EVENT_DESC, event_desc),
1944 FEAT_OPP(HEADER_CMDLINE, cmdline),
1945 FEAT_OPF(HEADER_CPU_TOPOLOGY, cpu_topology),
1946 FEAT_OPF(HEADER_NUMA_TOPOLOGY, numa_topology),
1947 FEAT_OPA(HEADER_BRANCH_STACK, branch_stack),
1948 FEAT_OPP(HEADER_PMU_MAPPINGS, pmu_mappings),
1949 FEAT_OPP(HEADER_GROUP_DESC, group_desc),
1950 FEAT_OPP(HEADER_AUXTRACE, auxtrace),
1953 struct header_print_data {
1955 bool full; /* extended list of headers */
1958 static int perf_file_section__fprintf_info(struct perf_file_section *section,
1959 struct perf_header *ph,
1960 int feat, int fd, void *data)
1962 struct header_print_data *hd = data;
1964 if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
1965 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
1966 "%d, continuing...\n", section->offset, feat);
1969 if (feat >= HEADER_LAST_FEATURE) {
1970 pr_warning("unknown feature %d\n", feat);
1973 if (!feat_ops[feat].print)
1976 if (!feat_ops[feat].full_only || hd->full)
1977 feat_ops[feat].print(ph, fd, hd->fp);
1979 fprintf(hd->fp, "# %s info available, use -I to display\n",
1980 feat_ops[feat].name);
1985 int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
1987 struct header_print_data hd;
1988 struct perf_header *header = &session->header;
1989 int fd = perf_data_file__fd(session->file);
1993 perf_header__process_sections(header, fd, &hd,
1994 perf_file_section__fprintf_info);
1998 static int do_write_feat(int fd, struct perf_header *h, int type,
1999 struct perf_file_section **p,
2000 struct perf_evlist *evlist)
2005 if (perf_header__has_feat(h, type)) {
2006 if (!feat_ops[type].write)
2009 (*p)->offset = lseek(fd, 0, SEEK_CUR);
2011 err = feat_ops[type].write(fd, h, evlist);
2013 pr_debug("failed to write feature %d\n", type);
2015 /* undo anything written */
2016 lseek(fd, (*p)->offset, SEEK_SET);
2020 (*p)->size = lseek(fd, 0, SEEK_CUR) - (*p)->offset;
2026 static int perf_header__adds_write(struct perf_header *header,
2027 struct perf_evlist *evlist, int fd)
2030 struct perf_file_section *feat_sec, *p;
2036 nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
2040 feat_sec = p = calloc(nr_sections, sizeof(*feat_sec));
2041 if (feat_sec == NULL)
2044 sec_size = sizeof(*feat_sec) * nr_sections;
2046 sec_start = header->feat_offset;
2047 lseek(fd, sec_start + sec_size, SEEK_SET);
2049 for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
2050 if (do_write_feat(fd, header, feat, &p, evlist))
2051 perf_header__clear_feat(header, feat);
2054 lseek(fd, sec_start, SEEK_SET);
2056 * may write more than needed due to dropped feature, but
2057 * this is okay, reader will skip the mising entries
2059 err = do_write(fd, feat_sec, sec_size);
2061 pr_debug("failed to write feature section\n");
2066 int perf_header__write_pipe(int fd)
2068 struct perf_pipe_file_header f_header;
2071 f_header = (struct perf_pipe_file_header){
2072 .magic = PERF_MAGIC,
2073 .size = sizeof(f_header),
2076 err = do_write(fd, &f_header, sizeof(f_header));
2078 pr_debug("failed to write perf pipe header\n");
2085 int perf_session__write_header(struct perf_session *session,
2086 struct perf_evlist *evlist,
2087 int fd, bool at_exit)
2089 struct perf_file_header f_header;
2090 struct perf_file_attr f_attr;
2091 struct perf_header *header = &session->header;
2092 struct perf_evsel *evsel;
2096 lseek(fd, sizeof(f_header), SEEK_SET);
2098 evlist__for_each(session->evlist, evsel) {
2099 evsel->id_offset = lseek(fd, 0, SEEK_CUR);
2100 err = do_write(fd, evsel->id, evsel->ids * sizeof(u64));
2102 pr_debug("failed to write perf header\n");
2107 attr_offset = lseek(fd, 0, SEEK_CUR);
2109 evlist__for_each(evlist, evsel) {
2110 f_attr = (struct perf_file_attr){
2111 .attr = evsel->attr,
2113 .offset = evsel->id_offset,
2114 .size = evsel->ids * sizeof(u64),
2117 err = do_write(fd, &f_attr, sizeof(f_attr));
2119 pr_debug("failed to write perf header attribute\n");
2124 if (!header->data_offset)
2125 header->data_offset = lseek(fd, 0, SEEK_CUR);
2126 header->feat_offset = header->data_offset + header->data_size;
2129 err = perf_header__adds_write(header, evlist, fd);
2134 f_header = (struct perf_file_header){
2135 .magic = PERF_MAGIC,
2136 .size = sizeof(f_header),
2137 .attr_size = sizeof(f_attr),
2139 .offset = attr_offset,
2140 .size = evlist->nr_entries * sizeof(f_attr),
2143 .offset = header->data_offset,
2144 .size = header->data_size,
2146 /* event_types is ignored, store zeros */
2149 memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));
2151 lseek(fd, 0, SEEK_SET);
2152 err = do_write(fd, &f_header, sizeof(f_header));
2154 pr_debug("failed to write perf header\n");
2157 lseek(fd, header->data_offset + header->data_size, SEEK_SET);
2162 static int perf_header__getbuffer64(struct perf_header *header,
2163 int fd, void *buf, size_t size)
2165 if (readn(fd, buf, size) <= 0)
2168 if (header->needs_swap)
2169 mem_bswap_64(buf, size);
2174 int perf_header__process_sections(struct perf_header *header, int fd,
2176 int (*process)(struct perf_file_section *section,
2177 struct perf_header *ph,
2178 int feat, int fd, void *data))
2180 struct perf_file_section *feat_sec, *sec;
2186 nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
2190 feat_sec = sec = calloc(nr_sections, sizeof(*feat_sec));
2194 sec_size = sizeof(*feat_sec) * nr_sections;
2196 lseek(fd, header->feat_offset, SEEK_SET);
2198 err = perf_header__getbuffer64(header, fd, feat_sec, sec_size);
2202 for_each_set_bit(feat, header->adds_features, HEADER_LAST_FEATURE) {
2203 err = process(sec++, header, feat, fd, data);
2213 static const int attr_file_abi_sizes[] = {
2214 [0] = PERF_ATTR_SIZE_VER0,
2215 [1] = PERF_ATTR_SIZE_VER1,
2216 [2] = PERF_ATTR_SIZE_VER2,
2217 [3] = PERF_ATTR_SIZE_VER3,
2218 [4] = PERF_ATTR_SIZE_VER4,
2223 * In the legacy file format, the magic number is not used to encode endianness.
2224 * hdr_sz was used to encode endianness. But given that hdr_sz can vary based
2225 * on ABI revisions, we need to try all combinations for all endianness to
2226 * detect the endianness.
2228 static int try_all_file_abis(uint64_t hdr_sz, struct perf_header *ph)
2230 uint64_t ref_size, attr_size;
2233 for (i = 0 ; attr_file_abi_sizes[i]; i++) {
2234 ref_size = attr_file_abi_sizes[i]
2235 + sizeof(struct perf_file_section);
2236 if (hdr_sz != ref_size) {
2237 attr_size = bswap_64(hdr_sz);
2238 if (attr_size != ref_size)
2241 ph->needs_swap = true;
2243 pr_debug("ABI%d perf.data file detected, need_swap=%d\n",
2248 /* could not determine endianness */
2252 #define PERF_PIPE_HDR_VER0 16
2254 static const size_t attr_pipe_abi_sizes[] = {
2255 [0] = PERF_PIPE_HDR_VER0,
2260 * In the legacy pipe format, there is an implicit assumption that endiannesss
2261 * between host recording the samples, and host parsing the samples is the
2262 * same. This is not always the case given that the pipe output may always be
2263 * redirected into a file and analyzed on a different machine with possibly a
2264 * different endianness and perf_event ABI revsions in the perf tool itself.
2266 static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph)
2271 for (i = 0 ; attr_pipe_abi_sizes[i]; i++) {
2272 if (hdr_sz != attr_pipe_abi_sizes[i]) {
2273 attr_size = bswap_64(hdr_sz);
2274 if (attr_size != hdr_sz)
2277 ph->needs_swap = true;
2279 pr_debug("Pipe ABI%d perf.data file detected\n", i);
2285 bool is_perf_magic(u64 magic)
2287 if (!memcmp(&magic, __perf_magic1, sizeof(magic))
2288 || magic == __perf_magic2
2289 || magic == __perf_magic2_sw)
2295 static int check_magic_endian(u64 magic, uint64_t hdr_sz,
2296 bool is_pipe, struct perf_header *ph)
2300 /* check for legacy format */
2301 ret = memcmp(&magic, __perf_magic1, sizeof(magic));
2303 ph->version = PERF_HEADER_VERSION_1;
2304 pr_debug("legacy perf.data format\n");
2306 return try_all_pipe_abis(hdr_sz, ph);
2308 return try_all_file_abis(hdr_sz, ph);
2311 * the new magic number serves two purposes:
2312 * - unique number to identify actual perf.data files
2313 * - encode endianness of file
2315 ph->version = PERF_HEADER_VERSION_2;
2317 /* check magic number with one endianness */
2318 if (magic == __perf_magic2)
2321 /* check magic number with opposite endianness */
2322 if (magic != __perf_magic2_sw)
2325 ph->needs_swap = true;
2330 int perf_file_header__read(struct perf_file_header *header,
2331 struct perf_header *ph, int fd)
2335 lseek(fd, 0, SEEK_SET);
2337 ret = readn(fd, header, sizeof(*header));
2341 if (check_magic_endian(header->magic,
2342 header->attr_size, false, ph) < 0) {
2343 pr_debug("magic/endian check failed\n");
2347 if (ph->needs_swap) {
2348 mem_bswap_64(header, offsetof(struct perf_file_header,
2352 if (header->size != sizeof(*header)) {
2353 /* Support the previous format */
2354 if (header->size == offsetof(typeof(*header), adds_features))
2355 bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
2358 } else if (ph->needs_swap) {
2360 * feature bitmap is declared as an array of unsigned longs --
2361 * not good since its size can differ between the host that
2362 * generated the data file and the host analyzing the file.
2364 * We need to handle endianness, but we don't know the size of
2365 * the unsigned long where the file was generated. Take a best
2366 * guess at determining it: try 64-bit swap first (ie., file
2367 * created on a 64-bit host), and check if the hostname feature
2368 * bit is set (this feature bit is forced on as of fbe96f2).
2369 * If the bit is not, undo the 64-bit swap and try a 32-bit
2370 * swap. If the hostname bit is still not set (e.g., older data
2371 * file), punt and fallback to the original behavior --
2372 * clearing all feature bits and setting buildid.
2374 mem_bswap_64(&header->adds_features,
2375 BITS_TO_U64(HEADER_FEAT_BITS));
2377 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
2379 mem_bswap_64(&header->adds_features,
2380 BITS_TO_U64(HEADER_FEAT_BITS));
2383 mem_bswap_32(&header->adds_features,
2384 BITS_TO_U32(HEADER_FEAT_BITS));
2387 if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
2388 bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
2389 set_bit(HEADER_BUILD_ID, header->adds_features);
2393 memcpy(&ph->adds_features, &header->adds_features,
2394 sizeof(ph->adds_features));
2396 ph->data_offset = header->data.offset;
2397 ph->data_size = header->data.size;
2398 ph->feat_offset = header->data.offset + header->data.size;
2402 static int perf_file_section__process(struct perf_file_section *section,
2403 struct perf_header *ph,
2404 int feat, int fd, void *data)
2406 if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
2407 pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
2408 "%d, continuing...\n", section->offset, feat);
2412 if (feat >= HEADER_LAST_FEATURE) {
2413 pr_debug("unknown feature %d, continuing...\n", feat);
2417 if (!feat_ops[feat].process)
2420 return feat_ops[feat].process(section, ph, fd, data);
2423 static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
2424 struct perf_header *ph, int fd,
2429 ret = readn(fd, header, sizeof(*header));
2433 if (check_magic_endian(header->magic, header->size, true, ph) < 0) {
2434 pr_debug("endian/magic failed\n");
2439 header->size = bswap_64(header->size);
2441 if (repipe && do_write(STDOUT_FILENO, header, sizeof(*header)) < 0)
2447 static int perf_header__read_pipe(struct perf_session *session)
2449 struct perf_header *header = &session->header;
2450 struct perf_pipe_file_header f_header;
2452 if (perf_file_header__read_pipe(&f_header, header,
2453 perf_data_file__fd(session->file),
2454 session->repipe) < 0) {
2455 pr_debug("incompatible file format\n");
2462 static int read_attr(int fd, struct perf_header *ph,
2463 struct perf_file_attr *f_attr)
2465 struct perf_event_attr *attr = &f_attr->attr;
2467 size_t our_sz = sizeof(f_attr->attr);
2470 memset(f_attr, 0, sizeof(*f_attr));
2472 /* read minimal guaranteed structure */
2473 ret = readn(fd, attr, PERF_ATTR_SIZE_VER0);
2475 pr_debug("cannot read %d bytes of header attr\n",
2476 PERF_ATTR_SIZE_VER0);
2480 /* on file perf_event_attr size */
2488 sz = PERF_ATTR_SIZE_VER0;
2489 } else if (sz > our_sz) {
2490 pr_debug("file uses a more recent and unsupported ABI"
2491 " (%zu bytes extra)\n", sz - our_sz);
2494 /* what we have not yet read and that we know about */
2495 left = sz - PERF_ATTR_SIZE_VER0;
2498 ptr += PERF_ATTR_SIZE_VER0;
2500 ret = readn(fd, ptr, left);
2502 /* read perf_file_section, ids are read in caller */
2503 ret = readn(fd, &f_attr->ids, sizeof(f_attr->ids));
2505 return ret <= 0 ? -1 : 0;
2508 static int perf_evsel__prepare_tracepoint_event(struct perf_evsel *evsel,
2509 struct pevent *pevent)
2511 struct event_format *event;
2514 /* already prepared */
2515 if (evsel->tp_format)
2518 if (pevent == NULL) {
2519 pr_debug("broken or missing trace data\n");
2523 event = pevent_find_event(pevent, evsel->attr.config);
2528 snprintf(bf, sizeof(bf), "%s:%s", event->system, event->name);
2529 evsel->name = strdup(bf);
2530 if (evsel->name == NULL)
2534 evsel->tp_format = event;
2538 static int perf_evlist__prepare_tracepoint_events(struct perf_evlist *evlist,
2539 struct pevent *pevent)
2541 struct perf_evsel *pos;
2543 evlist__for_each(evlist, pos) {
2544 if (pos->attr.type == PERF_TYPE_TRACEPOINT &&
2545 perf_evsel__prepare_tracepoint_event(pos, pevent))
2552 int perf_session__read_header(struct perf_session *session)
2554 struct perf_data_file *file = session->file;
2555 struct perf_header *header = &session->header;
2556 struct perf_file_header f_header;
2557 struct perf_file_attr f_attr;
2559 int nr_attrs, nr_ids, i, j;
2560 int fd = perf_data_file__fd(file);
2562 session->evlist = perf_evlist__new();
2563 if (session->evlist == NULL)
2566 session->evlist->env = &header->env;
2567 session->machines.host.env = &header->env;
2568 if (perf_data_file__is_pipe(file))
2569 return perf_header__read_pipe(session);
2571 if (perf_file_header__read(&f_header, header, fd) < 0)
2575 * Sanity check that perf.data was written cleanly; data size is
2576 * initialized to 0 and updated only if the on_exit function is run.
2577 * If data size is still 0 then the file contains only partial
2578 * information. Just warn user and process it as much as it can.
2580 if (f_header.data.size == 0) {
2581 pr_warning("WARNING: The %s file's data size field is 0 which is unexpected.\n"
2582 "Was the 'perf record' command properly terminated?\n",
2586 nr_attrs = f_header.attrs.size / f_header.attr_size;
2587 lseek(fd, f_header.attrs.offset, SEEK_SET);
2589 for (i = 0; i < nr_attrs; i++) {
2590 struct perf_evsel *evsel;
2593 if (read_attr(fd, header, &f_attr) < 0)
2596 if (header->needs_swap) {
2597 f_attr.ids.size = bswap_64(f_attr.ids.size);
2598 f_attr.ids.offset = bswap_64(f_attr.ids.offset);
2599 perf_event__attr_swap(&f_attr.attr);
2602 tmp = lseek(fd, 0, SEEK_CUR);
2603 evsel = perf_evsel__new(&f_attr.attr);
2606 goto out_delete_evlist;
2608 evsel->needs_swap = header->needs_swap;
2610 * Do it before so that if perf_evsel__alloc_id fails, this
2611 * entry gets purged too at perf_evlist__delete().
2613 perf_evlist__add(session->evlist, evsel);
2615 nr_ids = f_attr.ids.size / sizeof(u64);
2617 * We don't have the cpu and thread maps on the header, so
2618 * for allocating the perf_sample_id table we fake 1 cpu and
2619 * hattr->ids threads.
2621 if (perf_evsel__alloc_id(evsel, 1, nr_ids))
2622 goto out_delete_evlist;
2624 lseek(fd, f_attr.ids.offset, SEEK_SET);
2626 for (j = 0; j < nr_ids; j++) {
2627 if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))
2630 perf_evlist__id_add(session->evlist, evsel, 0, j, f_id);
2633 lseek(fd, tmp, SEEK_SET);
2636 symbol_conf.nr_events = nr_attrs;
2638 perf_header__process_sections(header, fd, &session->tevent,
2639 perf_file_section__process);
2641 if (perf_evlist__prepare_tracepoint_events(session->evlist,
2642 session->tevent.pevent))
2643 goto out_delete_evlist;
2650 perf_evlist__delete(session->evlist);
2651 session->evlist = NULL;
2655 int perf_event__synthesize_attr(struct perf_tool *tool,
2656 struct perf_event_attr *attr, u32 ids, u64 *id,
2657 perf_event__handler_t process)
2659 union perf_event *ev;
2663 size = sizeof(struct perf_event_attr);
2664 size = PERF_ALIGN(size, sizeof(u64));
2665 size += sizeof(struct perf_event_header);
2666 size += ids * sizeof(u64);
2673 ev->attr.attr = *attr;
2674 memcpy(ev->attr.id, id, ids * sizeof(u64));
2676 ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2677 ev->attr.header.size = (u16)size;
2679 if (ev->attr.header.size == size)
2680 err = process(tool, ev, NULL, NULL);
2689 int perf_event__synthesize_attrs(struct perf_tool *tool,
2690 struct perf_session *session,
2691 perf_event__handler_t process)
2693 struct perf_evsel *evsel;
2696 evlist__for_each(session->evlist, evsel) {
2697 err = perf_event__synthesize_attr(tool, &evsel->attr, evsel->ids,
2698 evsel->id, process);
2700 pr_debug("failed to create perf header attribute\n");
2708 int perf_event__process_attr(struct perf_tool *tool __maybe_unused,
2709 union perf_event *event,
2710 struct perf_evlist **pevlist)
2713 struct perf_evsel *evsel;
2714 struct perf_evlist *evlist = *pevlist;
2716 if (evlist == NULL) {
2717 *pevlist = evlist = perf_evlist__new();
2722 evsel = perf_evsel__new(&event->attr.attr);
2726 perf_evlist__add(evlist, evsel);
2728 ids = event->header.size;
2729 ids -= (void *)&event->attr.id - (void *)event;
2730 n_ids = ids / sizeof(u64);
2732 * We don't have the cpu and thread maps on the header, so
2733 * for allocating the perf_sample_id table we fake 1 cpu and
2734 * hattr->ids threads.
2736 if (perf_evsel__alloc_id(evsel, 1, n_ids))
2739 for (i = 0; i < n_ids; i++) {
2740 perf_evlist__id_add(evlist, evsel, 0, i, event->attr.id[i]);
2743 symbol_conf.nr_events = evlist->nr_entries;
2748 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd,
2749 struct perf_evlist *evlist,
2750 perf_event__handler_t process)
2752 union perf_event ev;
2753 struct tracing_data *tdata;
2754 ssize_t size = 0, aligned_size = 0, padding;
2755 int err __maybe_unused = 0;
2758 * We are going to store the size of the data followed
2759 * by the data contents. Since the fd descriptor is a pipe,
2760 * we cannot seek back to store the size of the data once
2761 * we know it. Instead we:
2763 * - write the tracing data to the temp file
2764 * - get/write the data size to pipe
2765 * - write the tracing data from the temp file
2768 tdata = tracing_data_get(&evlist->entries, fd, true);
2772 memset(&ev, 0, sizeof(ev));
2774 ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
2776 aligned_size = PERF_ALIGN(size, sizeof(u64));
2777 padding = aligned_size - size;
2778 ev.tracing_data.header.size = sizeof(ev.tracing_data);
2779 ev.tracing_data.size = aligned_size;
2781 process(tool, &ev, NULL, NULL);
2784 * The put function will copy all the tracing data
2785 * stored in temp file to the pipe.
2787 tracing_data_put(tdata);
2789 write_padded(fd, NULL, 0, padding);
2791 return aligned_size;
2794 int perf_event__process_tracing_data(struct perf_tool *tool __maybe_unused,
2795 union perf_event *event,
2796 struct perf_session *session)
2798 ssize_t size_read, padding, size = event->tracing_data.size;
2799 int fd = perf_data_file__fd(session->file);
2800 off_t offset = lseek(fd, 0, SEEK_CUR);
2803 /* setup for reading amidst mmap */
2804 lseek(fd, offset + sizeof(struct tracing_data_event),
2807 size_read = trace_report(fd, &session->tevent,
2809 padding = PERF_ALIGN(size_read, sizeof(u64)) - size_read;
2811 if (readn(fd, buf, padding) < 0) {
2812 pr_err("%s: reading input file", __func__);
2815 if (session->repipe) {
2816 int retw = write(STDOUT_FILENO, buf, padding);
2817 if (retw <= 0 || retw != padding) {
2818 pr_err("%s: repiping tracing data padding", __func__);
2823 if (size_read + padding != size) {
2824 pr_err("%s: tracing data size mismatch", __func__);
2828 perf_evlist__prepare_tracepoint_events(session->evlist,
2829 session->tevent.pevent);
2831 return size_read + padding;
2834 int perf_event__synthesize_build_id(struct perf_tool *tool,
2835 struct dso *pos, u16 misc,
2836 perf_event__handler_t process,
2837 struct machine *machine)
2839 union perf_event ev;
2846 memset(&ev, 0, sizeof(ev));
2848 len = pos->long_name_len + 1;
2849 len = PERF_ALIGN(len, NAME_ALIGN);
2850 memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
2851 ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
2852 ev.build_id.header.misc = misc;
2853 ev.build_id.pid = machine->pid;
2854 ev.build_id.header.size = sizeof(ev.build_id) + len;
2855 memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
2857 err = process(tool, &ev, NULL, machine);
2862 int perf_event__process_build_id(struct perf_tool *tool __maybe_unused,
2863 union perf_event *event,
2864 struct perf_session *session)
2866 __event_process_build_id(&event->build_id,
2867 event->build_id.filename,