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 void 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 events = realloc(events, (event_count + 1) * sizeof(struct perf_trace_event_type));
122 memset(&events[event_count], 0, sizeof(struct perf_trace_event_type));
123 events[event_count].event_id = id;
124 strncpy(events[event_count].name, name, MAX_EVENT_NAME - 1);
128 char *perf_header__find_event(u64 id)
131 for (i = 0 ; i < event_count; i++) {
132 if (events[i].event_id == id)
133 return events[i].name;
138 static const char *__perf_magic = "PERFFILE";
140 #define PERF_MAGIC (*(u64 *)__perf_magic)
142 struct perf_file_attr {
143 struct perf_event_attr attr;
144 struct perf_file_section ids;
147 void perf_header__set_feat(struct perf_header *self, int feat)
149 set_bit(feat, self->adds_features);
152 bool perf_header__has_feat(const struct perf_header *self, int feat)
154 return test_bit(feat, self->adds_features);
157 static int do_write(int fd, const void *buf, size_t size)
160 int ret = write(fd, buf, size);
172 static int __dsos__write_buildid_table(struct list_head *head, int fd)
174 #define NAME_ALIGN 64
176 static const char zero_buf[NAME_ALIGN];
178 list_for_each_entry(pos, head, node) {
180 struct build_id_event b;
183 if (!pos->has_build_id)
185 len = pos->long_name_len + 1;
186 len = ALIGN(len, NAME_ALIGN);
187 memset(&b, 0, sizeof(b));
188 memcpy(&b.build_id, pos->build_id, sizeof(pos->build_id));
189 b.header.size = sizeof(b) + len;
190 err = do_write(fd, &b, sizeof(b));
193 err = do_write(fd, pos->long_name, pos->long_name_len + 1);
196 err = do_write(fd, zero_buf, len - pos->long_name_len - 1);
204 static int dsos__write_buildid_table(int fd)
206 int err = __dsos__write_buildid_table(&dsos__kernel, fd);
208 err = __dsos__write_buildid_table(&dsos__user, fd);
212 static int perf_header__adds_write(struct perf_header *self, int fd)
215 struct perf_file_section *feat_sec;
220 if (dsos__read_build_ids())
221 perf_header__set_feat(self, HEADER_BUILD_ID);
223 nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
227 feat_sec = calloc(sizeof(*feat_sec), nr_sections);
228 if (feat_sec == NULL)
231 sec_size = sizeof(*feat_sec) * nr_sections;
233 sec_start = self->data_offset + self->data_size;
234 lseek(fd, sec_start + sec_size, SEEK_SET);
236 if (perf_header__has_feat(self, HEADER_TRACE_INFO)) {
237 struct perf_file_section *trace_sec;
239 trace_sec = &feat_sec[idx++];
241 /* Write trace info */
242 trace_sec->offset = lseek(fd, 0, SEEK_CUR);
243 read_tracing_data(fd, attrs, nr_counters);
244 trace_sec->size = lseek(fd, 0, SEEK_CUR) - trace_sec->offset;
248 if (perf_header__has_feat(self, HEADER_BUILD_ID)) {
249 struct perf_file_section *buildid_sec;
251 buildid_sec = &feat_sec[idx++];
253 /* Write build-ids */
254 buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
255 err = dsos__write_buildid_table(fd);
257 pr_debug("failed to write buildid table\n");
260 buildid_sec->size = lseek(fd, 0, SEEK_CUR) - buildid_sec->offset;
263 lseek(fd, sec_start, SEEK_SET);
264 err = do_write(fd, feat_sec, sec_size);
266 pr_debug("failed to write feature section\n");
272 int perf_header__write(struct perf_header *self, int fd, bool at_exit)
274 struct perf_file_header f_header;
275 struct perf_file_attr f_attr;
276 struct perf_header_attr *attr;
279 lseek(fd, sizeof(f_header), SEEK_SET);
282 for (i = 0; i < self->attrs; i++) {
283 attr = self->attr[i];
285 attr->id_offset = lseek(fd, 0, SEEK_CUR);
286 err = do_write(fd, attr->id, attr->ids * sizeof(u64));
288 pr_debug("failed to write perf header\n");
294 self->attr_offset = lseek(fd, 0, SEEK_CUR);
296 for (i = 0; i < self->attrs; i++) {
297 attr = self->attr[i];
299 f_attr = (struct perf_file_attr){
302 .offset = attr->id_offset,
303 .size = attr->ids * sizeof(u64),
306 err = do_write(fd, &f_attr, sizeof(f_attr));
308 pr_debug("failed to write perf header attribute\n");
313 self->event_offset = lseek(fd, 0, SEEK_CUR);
314 self->event_size = event_count * sizeof(struct perf_trace_event_type);
316 err = do_write(fd, events, self->event_size);
318 pr_debug("failed to write perf header events\n");
323 self->data_offset = lseek(fd, 0, SEEK_CUR);
326 err = perf_header__adds_write(self, fd);
331 f_header = (struct perf_file_header){
333 .size = sizeof(f_header),
334 .attr_size = sizeof(f_attr),
336 .offset = self->attr_offset,
337 .size = self->attrs * sizeof(f_attr),
340 .offset = self->data_offset,
341 .size = self->data_size,
344 .offset = self->event_offset,
345 .size = self->event_size,
349 memcpy(&f_header.adds_features, &self->adds_features, sizeof(self->adds_features));
351 lseek(fd, 0, SEEK_SET);
352 err = do_write(fd, &f_header, sizeof(f_header));
354 pr_debug("failed to write perf header\n");
357 lseek(fd, self->data_offset + self->data_size, SEEK_SET);
363 static void do_read(int fd, void *buf, size_t size)
366 int ret = read(fd, buf, size);
369 die("failed to read");
371 die("failed to read: missing data");
378 int perf_header__process_sections(struct perf_header *self, int fd,
379 int (*process)(struct perf_file_section *self,
382 struct perf_file_section *feat_sec;
386 int err = 0, feat = 1;
388 nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
392 feat_sec = calloc(sizeof(*feat_sec), nr_sections);
396 sec_size = sizeof(*feat_sec) * nr_sections;
398 lseek(fd, self->data_offset + self->data_size, SEEK_SET);
400 do_read(fd, feat_sec, sec_size);
402 while (idx < nr_sections && feat < HEADER_LAST_FEATURE) {
403 if (perf_header__has_feat(self, feat)) {
404 struct perf_file_section *sec = &feat_sec[idx++];
406 err = process(sec, feat, fd);
417 int perf_file_header__read(struct perf_file_header *self,
418 struct perf_header *ph, int fd)
420 lseek(fd, 0, SEEK_SET);
421 do_read(fd, self, sizeof(*self));
423 if (self->magic != PERF_MAGIC ||
424 self->attr_size != sizeof(struct perf_file_attr))
427 if (self->size != sizeof(*self)) {
428 /* Support the previous format */
429 if (self->size == offsetof(typeof(*self), adds_features))
430 bitmap_zero(self->adds_features, HEADER_FEAT_BITS);
435 memcpy(&ph->adds_features, &self->adds_features,
436 sizeof(self->adds_features));
438 ph->event_offset = self->event_types.offset;
439 ph->event_size = self->event_types.size;
440 ph->data_offset = self->data.offset;
441 ph->data_size = self->data.size;
445 static int perf_file_section__process(struct perf_file_section *self,
448 if (lseek(fd, self->offset, SEEK_SET) < 0) {
449 pr_debug("Failed to lseek to %Ld offset for feature %d, "
450 "continuing...\n", self->offset, feat);
455 case HEADER_TRACE_INFO:
459 case HEADER_BUILD_ID:
460 if (perf_header__read_build_ids(fd, self->offset, self->size))
461 pr_debug("Failed to read buildids, continuing...\n");
464 pr_debug("unknown feature %d, continuing...\n", feat);
470 int perf_header__read(struct perf_header *self, int fd)
472 struct perf_file_header f_header;
473 struct perf_file_attr f_attr;
475 int nr_attrs, nr_ids, i, j;
477 if (perf_file_header__read(&f_header, self, fd) < 0) {
478 pr_debug("incompatible file format\n");
482 nr_attrs = f_header.attrs.size / sizeof(f_attr);
483 lseek(fd, f_header.attrs.offset, SEEK_SET);
485 for (i = 0; i < nr_attrs; i++) {
486 struct perf_header_attr *attr;
489 do_read(fd, &f_attr, sizeof(f_attr));
490 tmp = lseek(fd, 0, SEEK_CUR);
492 attr = perf_header_attr__new(&f_attr.attr);
496 nr_ids = f_attr.ids.size / sizeof(u64);
497 lseek(fd, f_attr.ids.offset, SEEK_SET);
499 for (j = 0; j < nr_ids; j++) {
500 do_read(fd, &f_id, sizeof(f_id));
502 if (perf_header_attr__add_id(attr, f_id) < 0) {
503 perf_header_attr__delete(attr);
507 if (perf_header__add_attr(self, attr) < 0) {
508 perf_header_attr__delete(attr);
512 lseek(fd, tmp, SEEK_SET);
515 if (f_header.event_types.size) {
516 lseek(fd, f_header.event_types.offset, SEEK_SET);
517 events = malloc(f_header.event_types.size);
520 do_read(fd, events, f_header.event_types.size);
521 event_count = f_header.event_types.size / sizeof(struct perf_trace_event_type);
524 perf_header__process_sections(self, fd, perf_file_section__process);
526 lseek(fd, self->data_offset, SEEK_SET);
532 u64 perf_header__sample_type(struct perf_header *header)
537 for (i = 0; i < header->attrs; i++) {
538 struct perf_header_attr *attr = header->attr[i];
541 type = attr->attr.sample_type;
542 else if (type != attr->attr.sample_type)
543 die("non matching sample_type");
549 struct perf_event_attr *
550 perf_header__find_attr(u64 id, struct perf_header *header)
554 for (i = 0; i < header->attrs; i++) {
555 struct perf_header_attr *attr = header->attr[i];
558 for (j = 0; j < attr->ids; j++) {
559 if (attr->id[j] == id)