5 #include <linux/list.h>
10 #include "trace-event.h"
16 * Create new perf.data header attribute:
18 struct perf_header_attr *perf_header_attr__new(struct perf_event_attr *attr)
20 struct perf_header_attr *self = malloc(sizeof(*self));
26 self->id = malloc(sizeof(u64));
27 if (self->id == NULL) {
36 void perf_header_attr__delete(struct perf_header_attr *self)
42 int perf_header_attr__add_id(struct perf_header_attr *self, u64 id)
47 if (self->ids > self->size) {
48 int nsize = self->size * 2;
49 u64 *nid = realloc(self->id, nsize * sizeof(u64));
61 int perf_header__init(struct perf_header *self)
64 self->attr = malloc(sizeof(void *));
65 return self->attr == NULL ? -ENOMEM : 0;
68 void perf_header__exit(struct perf_header *self)
71 for (i = 0; i < self->attrs; ++i)
72 perf_header_attr__delete(self->attr[i]);
76 int perf_header__add_attr(struct perf_header *self,
77 struct perf_header_attr *attr)
82 if (self->attrs == self->size) {
83 int nsize = self->size * 2;
84 struct perf_header_attr **nattr;
86 nattr = realloc(self->attr, nsize * sizeof(void *));
94 self->attr[self->attrs++] = attr;
98 #define MAX_EVENT_NAME 64
100 struct perf_trace_event_type {
102 char name[MAX_EVENT_NAME];
105 static int event_count;
106 static struct perf_trace_event_type *events;
108 int perf_header__push_event(u64 id, const char *name)
110 if (strlen(name) > MAX_EVENT_NAME)
111 pr_warning("Event %s will be truncated\n", name);
114 events = malloc(sizeof(struct perf_trace_event_type));
118 struct perf_trace_event_type *nevents;
120 nevents = realloc(events, (event_count + 1) * sizeof(*events));
125 memset(&events[event_count], 0, sizeof(struct perf_trace_event_type));
126 events[event_count].event_id = id;
127 strncpy(events[event_count].name, name, MAX_EVENT_NAME - 1);
132 char *perf_header__find_event(u64 id)
135 for (i = 0 ; i < event_count; i++) {
136 if (events[i].event_id == id)
137 return events[i].name;
142 static const char *__perf_magic = "PERFFILE";
144 #define PERF_MAGIC (*(u64 *)__perf_magic)
146 struct perf_file_attr {
147 struct perf_event_attr attr;
148 struct perf_file_section ids;
151 void perf_header__set_feat(struct perf_header *self, int feat)
153 set_bit(feat, self->adds_features);
156 bool perf_header__has_feat(const struct perf_header *self, int feat)
158 return test_bit(feat, self->adds_features);
161 static int do_write(int fd, const void *buf, size_t size)
164 int ret = write(fd, buf, size);
176 #define NAME_ALIGN 64
178 static int write_padded(int fd, const void *bf, size_t count,
179 size_t count_aligned)
181 static const char zero_buf[NAME_ALIGN];
182 int err = do_write(fd, bf, count);
185 err = do_write(fd, zero_buf, count_aligned - count);
190 #define dsos__for_each_with_build_id(pos, head) \
191 list_for_each_entry(pos, head, node) \
192 if (!pos->has_build_id) \
196 static int __dsos__write_buildid_table(struct list_head *head, u16 misc, int fd)
200 dsos__for_each_with_build_id(pos, head) {
202 struct build_id_event b;
203 size_t len = pos->long_name_len + 1;
205 len = ALIGN(len, NAME_ALIGN);
206 memset(&b, 0, sizeof(b));
207 memcpy(&b.build_id, pos->build_id, sizeof(pos->build_id));
208 b.header.misc = misc;
209 b.header.size = sizeof(b) + len;
210 err = do_write(fd, &b, sizeof(b));
213 err = write_padded(fd, pos->long_name,
214 pos->long_name_len + 1, len);
222 static int dsos__write_buildid_table(int fd)
224 int err = __dsos__write_buildid_table(&dsos__kernel,
225 PERF_RECORD_MISC_KERNEL, fd);
227 err = __dsos__write_buildid_table(&dsos__user,
228 PERF_RECORD_MISC_USER, fd);
232 static int dso__cache_build_id(struct dso *self, const char *debugdir)
234 const size_t size = PATH_MAX;
235 char *filename = malloc(size),
236 *linkname = malloc(size), *targetname, *sbuild_id;
239 if (filename == NULL || linkname == NULL)
242 len = snprintf(filename, size, "%s%s", debugdir, self->long_name);
243 if (mkdir_p(filename, 0755))
246 len += snprintf(filename + len, sizeof(filename) - len, "/");
247 sbuild_id = filename + len;
248 build_id__sprintf(self->build_id, sizeof(self->build_id), sbuild_id);
250 if (access(filename, F_OK) && link(self->long_name, filename) &&
251 copyfile(self->long_name, filename))
254 len = snprintf(linkname, size, "%s/.build-id/%.2s",
255 debugdir, sbuild_id);
257 if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
260 snprintf(linkname + len, size - len, "/%s", sbuild_id + 2);
261 targetname = filename + strlen(debugdir) - 5;
262 memcpy(targetname, "../..", 5);
264 if (symlink(targetname, linkname) == 0)
272 static int __dsos__cache_build_ids(struct list_head *head, const char *debugdir)
277 dsos__for_each_with_build_id(pos, head)
278 if (dso__cache_build_id(pos, debugdir))
284 static int dsos__cache_build_ids(void)
286 int err_kernel, err_user;
287 char debugdir[PATH_MAX];
289 snprintf(debugdir, sizeof(debugdir), "%s/%s", getenv("HOME"),
292 if (mkdir(debugdir, 0755) != 0 && errno != EEXIST)
295 err_kernel = __dsos__cache_build_ids(&dsos__kernel, debugdir);
296 err_user = __dsos__cache_build_ids(&dsos__user, debugdir);
297 return err_kernel || err_user ? -1 : 0;
300 static int perf_header__adds_write(struct perf_header *self, int fd)
303 struct perf_file_section *feat_sec;
308 if (dsos__read_build_ids())
309 perf_header__set_feat(self, HEADER_BUILD_ID);
311 nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
315 feat_sec = calloc(sizeof(*feat_sec), nr_sections);
316 if (feat_sec == NULL)
319 sec_size = sizeof(*feat_sec) * nr_sections;
321 sec_start = self->data_offset + self->data_size;
322 lseek(fd, sec_start + sec_size, SEEK_SET);
324 if (perf_header__has_feat(self, HEADER_TRACE_INFO)) {
325 struct perf_file_section *trace_sec;
327 trace_sec = &feat_sec[idx++];
329 /* Write trace info */
330 trace_sec->offset = lseek(fd, 0, SEEK_CUR);
331 read_tracing_data(fd, attrs, nr_counters);
332 trace_sec->size = lseek(fd, 0, SEEK_CUR) - trace_sec->offset;
336 if (perf_header__has_feat(self, HEADER_BUILD_ID)) {
337 struct perf_file_section *buildid_sec;
339 buildid_sec = &feat_sec[idx++];
341 /* Write build-ids */
342 buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
343 err = dsos__write_buildid_table(fd);
345 pr_debug("failed to write buildid table\n");
348 buildid_sec->size = lseek(fd, 0, SEEK_CUR) - buildid_sec->offset;
349 dsos__cache_build_ids();
352 lseek(fd, sec_start, SEEK_SET);
353 err = do_write(fd, feat_sec, sec_size);
355 pr_debug("failed to write feature section\n");
361 int perf_header__write(struct perf_header *self, int fd, bool at_exit)
363 struct perf_file_header f_header;
364 struct perf_file_attr f_attr;
365 struct perf_header_attr *attr;
368 lseek(fd, sizeof(f_header), SEEK_SET);
371 for (i = 0; i < self->attrs; i++) {
372 attr = self->attr[i];
374 attr->id_offset = lseek(fd, 0, SEEK_CUR);
375 err = do_write(fd, attr->id, attr->ids * sizeof(u64));
377 pr_debug("failed to write perf header\n");
383 self->attr_offset = lseek(fd, 0, SEEK_CUR);
385 for (i = 0; i < self->attrs; i++) {
386 attr = self->attr[i];
388 f_attr = (struct perf_file_attr){
391 .offset = attr->id_offset,
392 .size = attr->ids * sizeof(u64),
395 err = do_write(fd, &f_attr, sizeof(f_attr));
397 pr_debug("failed to write perf header attribute\n");
402 self->event_offset = lseek(fd, 0, SEEK_CUR);
403 self->event_size = event_count * sizeof(struct perf_trace_event_type);
405 err = do_write(fd, events, self->event_size);
407 pr_debug("failed to write perf header events\n");
412 self->data_offset = lseek(fd, 0, SEEK_CUR);
415 err = perf_header__adds_write(self, fd);
420 f_header = (struct perf_file_header){
422 .size = sizeof(f_header),
423 .attr_size = sizeof(f_attr),
425 .offset = self->attr_offset,
426 .size = self->attrs * sizeof(f_attr),
429 .offset = self->data_offset,
430 .size = self->data_size,
433 .offset = self->event_offset,
434 .size = self->event_size,
438 memcpy(&f_header.adds_features, &self->adds_features, sizeof(self->adds_features));
440 lseek(fd, 0, SEEK_SET);
441 err = do_write(fd, &f_header, sizeof(f_header));
443 pr_debug("failed to write perf header\n");
446 lseek(fd, self->data_offset + self->data_size, SEEK_SET);
452 static int do_read(int fd, void *buf, size_t size)
455 int ret = read(fd, buf, size);
467 int perf_header__process_sections(struct perf_header *self, int fd,
468 int (*process)(struct perf_file_section *self,
471 struct perf_file_section *feat_sec;
475 int err = -1, feat = 1;
477 nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
481 feat_sec = calloc(sizeof(*feat_sec), nr_sections);
485 sec_size = sizeof(*feat_sec) * nr_sections;
487 lseek(fd, self->data_offset + self->data_size, SEEK_SET);
489 if (do_read(fd, feat_sec, sec_size))
493 while (idx < nr_sections && feat < HEADER_LAST_FEATURE) {
494 if (perf_header__has_feat(self, feat)) {
495 struct perf_file_section *sec = &feat_sec[idx++];
497 err = process(sec, feat, fd);
508 int perf_file_header__read(struct perf_file_header *self,
509 struct perf_header *ph, int fd)
511 lseek(fd, 0, SEEK_SET);
513 if (do_read(fd, self, sizeof(*self)) ||
514 self->magic != PERF_MAGIC ||
515 self->attr_size != sizeof(struct perf_file_attr))
518 if (self->size != sizeof(*self)) {
519 /* Support the previous format */
520 if (self->size == offsetof(typeof(*self), adds_features))
521 bitmap_zero(self->adds_features, HEADER_FEAT_BITS);
526 memcpy(&ph->adds_features, &self->adds_features,
527 sizeof(self->adds_features));
529 ph->event_offset = self->event_types.offset;
530 ph->event_size = self->event_types.size;
531 ph->data_offset = self->data.offset;
532 ph->data_size = self->data.size;
536 static int perf_file_section__process(struct perf_file_section *self,
539 if (lseek(fd, self->offset, SEEK_SET) < 0) {
540 pr_debug("Failed to lseek to %Ld offset for feature %d, "
541 "continuing...\n", self->offset, feat);
546 case HEADER_TRACE_INFO:
550 case HEADER_BUILD_ID:
551 if (perf_header__read_build_ids(fd, self->offset, self->size))
552 pr_debug("Failed to read buildids, continuing...\n");
555 pr_debug("unknown feature %d, continuing...\n", feat);
561 int perf_header__read(struct perf_header *self, int fd)
563 struct perf_file_header f_header;
564 struct perf_file_attr f_attr;
566 int nr_attrs, nr_ids, i, j;
568 if (perf_file_header__read(&f_header, self, fd) < 0) {
569 pr_debug("incompatible file format\n");
573 nr_attrs = f_header.attrs.size / sizeof(f_attr);
574 lseek(fd, f_header.attrs.offset, SEEK_SET);
576 for (i = 0; i < nr_attrs; i++) {
577 struct perf_header_attr *attr;
580 if (do_read(fd, &f_attr, sizeof(f_attr)))
582 tmp = lseek(fd, 0, SEEK_CUR);
584 attr = perf_header_attr__new(&f_attr.attr);
588 nr_ids = f_attr.ids.size / sizeof(u64);
589 lseek(fd, f_attr.ids.offset, SEEK_SET);
591 for (j = 0; j < nr_ids; j++) {
592 if (do_read(fd, &f_id, sizeof(f_id)))
595 if (perf_header_attr__add_id(attr, f_id) < 0) {
596 perf_header_attr__delete(attr);
600 if (perf_header__add_attr(self, attr) < 0) {
601 perf_header_attr__delete(attr);
605 lseek(fd, tmp, SEEK_SET);
608 if (f_header.event_types.size) {
609 lseek(fd, f_header.event_types.offset, SEEK_SET);
610 events = malloc(f_header.event_types.size);
613 if (do_read(fd, events, f_header.event_types.size))
615 event_count = f_header.event_types.size / sizeof(struct perf_trace_event_type);
618 perf_header__process_sections(self, fd, perf_file_section__process);
620 lseek(fd, self->data_offset, SEEK_SET);
628 u64 perf_header__sample_type(struct perf_header *header)
633 for (i = 0; i < header->attrs; i++) {
634 struct perf_header_attr *attr = header->attr[i];
637 type = attr->attr.sample_type;
638 else if (type != attr->attr.sample_type)
639 die("non matching sample_type");
645 struct perf_event_attr *
646 perf_header__find_attr(u64 id, struct perf_header *header)
650 for (i = 0; i < header->attrs; i++) {
651 struct perf_header_attr *attr = header->attr[i];
654 for (j = 0; j < attr->ids; j++) {
655 if (attr->id[j] == id)